Part Number
    Please enter a valid full or partial manufacturer part number with a minimum of 3 letters or numbers

    LM317KC Search Results

    LM317KC Result Highlights (3)

    Part ECAD Model Manufacturer Description Download Buy
    LM317KCSE3
    Texas Instruments 3-pin and 4-pin 1.5-A adjustable positive voltage regulator 3-TO-220 0 to 125 Visit Texas Instruments Buy
    LM317KCS
    Texas Instruments 3-pin and 4-pin 1.5-A adjustable positive voltage regulator 3-TO-220 0 to 125 Visit Texas Instruments Buy
    LM317KCT
    Texas Instruments 3-pin and 4-pin 1.5-A adjustable positive voltage regulator 3-TO-220 0 to 125 Visit Texas Instruments Buy

    LM317KC Datasheets (18)

    Select Manufacturer
    Part ECAD Model Manufacturer Description Datasheet Type PDF PDF Size Page count
    LM317KC
    National Semiconductor 3-Terminal Adjustable Regulator Original PDF 740.11KB 25
    LM317KC
    Texas Instruments LM317 - 3/4 Pin 1.5A Adjustable Positive Voltage Regulator 3-TO-220 0 to 125 Original PDF 808.51KB 26
    LM317KC
    Texas Instruments 3-Terminal Adjustable Regulator Original PDF 278.83KB 15
    LM317KC
    Texas Instruments 3-Terminal, 1.5A Adjustable Positive Voltage Regulator Original PDF 392.41KB 16
    LM317KC
    Texas Instruments 3/4 Pin 1.5A Adjustable Positive Voltage Regulator 3-TO-220 0 to 125 Original PDF 1MB 23
    LM317KC
    Unknown Historical semiconductor price guide (US$ - 1998). From our catalog scanning project. Historical PDF 32.97KB 1
    LM317KC
    Unknown Historical semiconductor price guide (US$ - 1998). From our catalog scanning project. Historical PDF 32.97KB 1
    LM317KC
    Unknown Shortform Data and Cross References (Misc Datasheets) Short Form PDF 37.85KB 1
    LM317KCE3
    Texas Instruments LM317 - 3/4 Pin 1.5A Adjustable Positive Voltage Regulator 3-TO-220 0 to 125 Original PDF 808.51KB 26
    LM317KCE3
    Texas Instruments 3/4 Pin 1.5A Adjustable Positive Voltage Regulator 3-TO-220 0 to 125 Original PDF 1MB 23
    LM317KCS
    Texas Instruments LM317 - 3/4 Pin 1.5A Adjustable Positive Voltage Regulator 3-TO-220 0 to 125 Original PDF 808.51KB 26
    LM317KCS
    Texas Instruments 3-Terminal Adjustable Regulator Original PDF 278.83KB 15
    LM317KCS
    Texas Instruments 3-Terminal, 1.5A Adjustable Positive Voltage Regulator Original PDF 392.42KB 16
    LM317KCS
    Texas Instruments 3/4 Pin 1.5A Adjustable Positive Voltage Regulator 3-TO-220 0 to 125 Original PDF 1MB 23
    LM317KCSE3
    Texas Instruments LM317 - 3/4 Pin 1.5A Adjustable Positive Voltage Regulator 3-TO-220 0 to 125 Original PDF 808.51KB 26
    LM317KCSE3
    Texas Instruments 3-Terminal, 1.5A Adjustable Positive Voltage Regulator Original PDF 1.76MB 18
    LM317KCSE3
    Texas Instruments 3/4 Pin 1.5A Adjustable Positive Voltage Regulator 3-TO-220 0 to 125 Original PDF 1MB 23
    LM317KCT
    Texas Instruments LM317 - 3/4 Pin 1.5A Adjustable Positive Voltage Regulator 3-TO-220 0 to 125 Original PDF 808.51KB 26
    SF Impression Pixel

    LM317KC Price and Stock

    Texas Instruments

    Texas Instruments LM317KCS

    IC: voltage regulator; linear,adjustable; 1.25÷37V; 1.5A; TO220-3
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    TME LM317KCS 1
    • 1 $1.72
    • 10 $1.05
    • 100 $0.88
    • 1000 $0.88
    • 10000 $0.88
    Get Quote
    Verical LM317KCS 6 5
    • 1 -
    • 10 $0.80
    • 100 $0.66
    • 1000 $0.58
    • 10000 $0.55
    Buy Now
    Mouser Electronics LM317KCS 84
    • 1 $3.22
    • 10 $2.40
    • 100 $1.65
    • 1000 $1.48
    • 10000 $1.48
    Buy Now
    Arrow Electronics LM317KCS 6 1
    • 1 $1.04
    • 10 $0.80
    • 100 $0.66
    • 1000 $0.58
    • 10000 $0.55
    Buy Now
    Newark LM317KCS Bulk 1
    • 1 $1.72
    • 10 $1.34
    • 100 $1.14
    • 1000 $1.04
    • 10000 $0.99
    Buy Now
    Bristol Electronics LM317KCS 100
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Quest Components LM317KCS 50
    • 1 $0.71
    • 10 $0.59
    • 100 $0.47
    • 1000 $0.47
    • 10000 $0.47
    Buy Now
    Win Source Electronics LM317KCS 12,000
    • 1 -
    • 10 -
    • 100 $1.20
    • 1000 $0.98
    • 10000 $0.98
    Buy Now

    Texas Instruments LM317KC

    Standard Regulator Pos 1.25V to 37V 1.5A 3-Pin(3+Tab) TO-220 Tube
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Verical () LM317KC 92,042 493
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.63
    • 10000 $0.56
    Buy Now
    LM317KC 15,699 493
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.63
    • 10000 $0.56
    Buy Now
    LM317KC 4,759 493
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.63
    • 10000 $0.56
    Buy Now
    LM317KC 1,255 493
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.63
    • 10000 $0.56
    Buy Now
    LM317KC 850 493
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.63
    • 10000 $0.56
    Buy Now
    Bristol Electronics LM317KC 74
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Quest Components () LM317KC 337
    • 1 $1.00
    • 10 $1.00
    • 100 $0.47
    • 1000 $0.47
    • 10000 $0.47
    Buy Now
    LM317KC 59
    • 1 $2.36
    • 10 $2.36
    • 100 $1.18
    • 1000 $1.18
    • 10000 $1.18
    Buy Now
    Rochester Electronics LM317KC 114,982 1
    • 1 -
    • 10 -
    • 100 $0.61
    • 1000 $0.51
    • 10000 $0.45
    Buy Now

    Texas Instruments LM317KCT

    Standard Regulator Pos 1.25V to 37V 1.5A 3-Pin(3+Tab) TO-220 Tube
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Verical LM317KCT 78,244 1,224
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.27
    Buy Now
    Quest Components LM317KCT 552
    • 1 $0.91
    • 10 $0.91
    • 100 $0.46
    • 1000 $0.27
    • 10000 $0.27
    Buy Now
    Rochester Electronics LM317KCT 78,244 1
    • 1 -
    • 10 -
    • 100 $0.30
    • 1000 $0.25
    • 10000 $0.22
    Buy Now
    Vyrian LM317KCT 1,550
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote

    Texas Instruments LM317KCE3

    Standard Regulator Pos 1.25V to 37V 1.5A 3-Pin(3+Tab) TO-220 Tube
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Verical LM317KCE3 1,000 493
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.63
    • 10000 $0.56
    Buy Now
    Rochester Electronics LM317KCE3 1,000 1
    • 1 -
    • 10 -
    • 100 $0.61
    • 1000 $0.51
    • 10000 $0.45
    Buy Now
    Vyrian LM317KCE3 1,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote

    Texas Instruments LM317KCSE3

    Linear Voltage Regulators 3/4 Pin 1.5A Adj Pos Vltg Reg ALT 595-LM ALT 595-LM317KCS
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Mouser Electronics LM317KCSE3 18
    • 1 $3.22
    • 10 $2.40
    • 100 $1.97
    • 1000 $1.73
    • 10000 $1.67
    Buy Now
    Vyrian LM317KCSE3 6,700
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Win Source Electronics LM317KCSE3 10,970
    • 1 -
    • 10 -
    • 100 $1.20
    • 1000 $0.98
    • 10000 $0.98
    Buy Now

    LM317KC Datasheets Context Search

    Catalog Datasheet Type Document Tags PDF

    Contextual Info: LM317KC Linear ICs Adjustable Positive Voltage Regulator status Military/High-RelN Load Current Max. A 1.5 Min. Adjustable Output Voltage1.2 Max. Adjustable Output Voltage37 Output Voltage Nominal (V)37 Drop-Out Volt Max. P(D) Max. (W)2.0 Nom. Supp (V)40


    Original
    lm317kcvoltage37styleto-220abcode3-102+1numberln00300102 PDF

    Contextual Info: LM317 3-TERMINAL ADJUSTABLE REGULATOR www.ti.com SLVS044Q – SEPTEMBER 1997 – REVISED OCTOBER 2005 FEATURES • • • Output Voltage Range Adjustable From 1.25 V to 37 V Output Current Greater Than 1.5 A Internal Short-Circuit Current Limiting • •


    Original
    lm317slvs044qo-220ot-223 PDF

    LM317 8 pins

    Contextual Info: LM317 www.ti.com SLVS044V – SEPTEMBER 1997 – REVISED FEBRUARY 2013 3-TERMINAL ADJUSTABLE REGULATOR Check for Samples: LM317 FEATURES 1 • • Output Voltage Range Adjustable From 1.25 V to 37 V Output Current Greater Than 1.5 A Internal Short-Circuit Current Limiting


    Original
    lm317slvs044vot-223o-220+2o-263lm317 8 pins PDF

    relay Re 04501

    Abstract: JFET TRANSISTOR REPLACEMENT GUIDE j201 re 04501 relay wabash relay 1SK6-0001 wabash reed relay JFET TRANSISTOR REPLACEMENT GUIDE e201 npdsu406 34901a ysi 44031
    Contextual Info: ••• • V . / • * •. Agilent Technologie: Innovating the HP Way ' — ENGI86 Service Guid< Agilent 34970A D ata Acquisition / Switch U nit C opyright 1999 H ew lett-Packard Company All Rights Reserved. P rinting History E dition 1, Ju n e 1997


    OCR Scan
    engi864970ae1199relay re 04501+9jfet transistor replacement guide j201re 04501 relaywabash relay1sk6-0001wabash reed relayjfet transistor replacement guide e201npdsu40634901aysi 44031 PDF

    LM317MP

    Abstract: LM317 National LM317AK LM317T TO-202 Parallel Application LM317 12v battery charger lm317 LM317T LM317T TO-220 LM317AKC LM317AK-STEEL
    Contextual Info: L M 1 1 7 A / L M 1 1 7 / L M 3 1 7 A / L M 3 17 3 - T e r m in a l A d ju s t a b le R e g u la t o r General Description The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 1,5A over a 1.2V to 37V output range. They are exceptionally easy to


    OCR Scan
    lm117a/lm117/lm317a/lm317lm117lm117aklm117k+11lm317aklm317klm317akclm317mplm317 nationallm317t to-202parallel application lm31712v battery charger lm317lm317tlm317t to-220lm317ak-steel PDF

    schematic diagram atx Power supply 500w

    Abstract: pioneer PAL 012A 1000w inverter PURE SINE WAVE schematic diagram 600va numeric ups circuit diagrams winbond bios 25064 TLE 9180 infineon smsc MEC 1300 nu TBE schematic diagram inverter 2000w DK55 circuit diagram of luminous 600va UPS
    Contextual Info: QUICK INDEX NEW IN THIS ISSUE! Detailed Index - See Pages 3-24 Digital Signal Processors, iCoupler , iMEMS® and iSensor . . . . . 805, 2707, 2768-2769 Connectors, Cable Assemblies, IC Sockets . . . . . . . . . . . 28-568 RF Connectors . . . . . . . . . . . . . . . . . . . . . . Pages 454-455


    Original
    p462-ndp463-ndlng295lfcp2ulng395mftp5u+11us2011schematic diagram atx power supply 500wpioneer pal 012a1000w inverter pure sine wave schematic diagram600va numeric ups circuit diagramswinbond bios 25064tle 9180 infineonsmsc mec 1300 nutbe schematic diagram inverter 2000wdk55circuit diagram of luminous 600va ups PDF

    N5741V

    Abstract: 9667PC LM317T RC4558DN SN75150N rc741dn MC3346P RC4136N "cross reference" NE555V UC494C
    Contextual Info: Analog Integrated Circuits Cross Reference This Cross Reference lists Analog Devices by either industry standard part number or by manufacturer’s part number for which there is an ON Semiconductor nearest or similar replacement. For devices not listed, or for


    Original
    r14153crd800/dn5741v9667pc+8lm317trc4558dnsn75150nrc741dnmc3346prc4136n "cross referencene555vuc494c PDF

    Parallel Application LM317

    Abstract: pulse charger 5A with LM317 IC LM317 use in 12v charger circuit LM317AMP LM117 LM317 0 to 12 volts voltage regulator diagram LM317 0 to 30 volts voltage regulator LM117AH LM317 MP lm117a
    Contextual Info: LM117A/LM117/LM317A/LM317 3-Terminal Adjustable Regulator General Description The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 1,5A over a 1.2V to 37V output range. They are exceptionally easy to use and require only two external resistors to set the output


    OCR Scan
    lm117a/lm117/lm317a/lm317lm117lm317lm117ak+11lm117ak/883lm117kparallel application lm317pulse charger 5a with lm317ic lm317 use in 12v charger circuitlm317amplm317 0 to 12 volts voltage regulator diagramlm317 0 to 30 volts voltage regulatorlm117ahlm317 mplm117a PDF

    lm317

    Contextual Info: LM317 www.ti.com. SLVS044U – SEPTEMBER 1997 – REVISED APRIL 2008 3-TERMINAL ADJUSTABLE REGULATOR FEATURES 1 • Output Voltage Range Adjustable From 1.25 V


    Original
    lm317slvs044uot-223o-220+1o-263 PDF

    FSQ510 Equivalent

    Abstract: BTA12 6008 bta16 6008 ZIGBEE interface with AVR ATmega16 Precision triac control thermostat thyristor t 558 f eupec gw 5819 diode transistor a564 A564 transistor BSM25GP120 b2
    Contextual Info: SEMICONDUCTORS MCU/MPU/DSP Atmel. . . . . . . . . 167, 168, 169, 170, 171, 172 Blackhawk. . . . . . . . . . . . . . . . . . . . . . . . . 173 Cyan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174 Cypress. . . . . . . . . . . . . . . 175, 176, 177, 178


    Original
    gp-20fsq510 equivalentbta12 6008bta16 6008+7zigbee interface with avr atmega16precision triac control thermostatthyristor t 558 f eupecgw 5819 diodetransistor a564a564 transistorbsm25gp120 b2 PDF

    IC LM317 DIP

    Abstract: LM317 LM317 application data LM317 uses Battery charger lm317 LM317 circuit diagram schematic 1N4002 LM317DCY LM317KC LM317KCS
    Contextual Info: LM317 3-TERMINAL ADJUSTABLE REGULATOR SLVS044O – SEPTEMBER 1997 – REVISED JULY 2003 D D D D D Output Voltage Range Adjustable From 1.25 V to 37 V Output Current Greater Than 1.5 A Internal Short-Circuit Current Limiting Thermal Overload Protection Output Safe-Area Compensation


    Original
    lm317slvs044oo-220ot-223+1025plicationsic lm317 diplm317 application datalm317 usesbattery charger lm317lm317 circuit diagram schematic1n4002lm317dcylm317kclm317kcs PDF

    Battery charger lm317

    Abstract: LM317 LM317 application note kc210 lm317 sot-89 lm317 02 LM317 uses IC LM317 lm317 a 8 terminal LM317DCYR
    Contextual Info: LM317 3-TERMINAL ADJUSTABLE REGULATOR SLVS044N – SEPTEMBER 1997 – REVISED MAY 2003 D D D D D Output Voltage Range Adjustable From 1.25 V to 37 V Output Current Greater Than 1.5 A Internal Short-Circuit Current Limiting Thermal Overload Protection Output Safe-Area Compensation


    Original
    lm317slvs044no-220ot-223+9battery charger lm317lm317 application notekc210lm317 sot-89lm317 02lm317 usesic lm317lm317 a 8 terminallm317dcyr PDF

    Contextual Info: LM317 3-TERMINAL ADJUSTABLE REGULATOR www.ti.com SLVS044Q – SEPTEMBER 1997 – REVISED OCTOBER 2005 FEATURES • • • Output Voltage Range Adjustable From 1.25 V to 37 V Output Current Greater Than 1.5 A Internal Short-Circuit Current Limiting • •


    Original
    lm317slvs044qo-220ot-223 PDF

    lm317

    Abstract: LM317 DIE
    Contextual Info: LM317 3ĆTERMINAL ADJUSTABLE REGULATOR ą ąą SLVS044P − SEPTEMBER 1997 − REVISED APRIL 2005 D Output Voltage Range Adjustable From D D Internal Short-Circuit Current Limiting D Thermal Overload Protection D Output Safe-Area Compensation 1.25 V to 37 V


    Original
    lm317slvs044po-220ot-223+1lm317 die PDF

    lm317 sot-89

    Contextual Info: LM317 3-TERMINAL ADJUSTABLE REGULATOR www.ti.com SLVS044Q – SEPTEMBER 1997 – REVISED OCTOBER 2005 FEATURES • • • Output Voltage Range Adjustable From 1.25 V to 37 V Output Current Greater Than 1.5 A Internal Short-Circuit Current Limiting • •


    Original
    lm317slvs044qo-220ot-223+1lm317 sot-89 PDF

    lm317 a 8 terminal

    Abstract: IC LM317 Battery charger lm317 LM317 circuit diagram schematic LM317 functions of ic lm317 LM317 application note IC LM317 DATA SHEET 1N4002 diode download datasheet adjustable voltage power supply using Lm317
    Contextual Info: LM317 3-TERMINAL ADJUSTABLE REGULATOR SLVS044M – SEPTEMBER 1997 – REVISED FEBRUARY 2003 D D D D D Output Voltage Range Adjustable From 1.25 V to 37 V Output Current Greater Than 1.5 A Internal Short-Circuit Current Limiting Thermal Overload Protection


    Original
    lm317slvs044mo-220ot-223+9lm317 a 8 terminalic lm317battery charger lm317lm317 circuit diagram schematicfunctions of ic lm317lm317 application noteic lm317 data sheet1n4002 diode download datasheetadjustable voltage power supply using lm317 PDF

    lm317

    Abstract: LM317 8 pins
    Contextual Info: LM317 www.ti.com. SLVS044U – SEPTEMBER 1997 – REVISED APRIL 2008 3-TERMINAL ADJUSTABLE REGULATOR FEATURES 1 • Output Voltage Range Adjustable From 1.25 V


    Original
    lm317slvs044uot-223o-220+2o-263lm317 8 pins PDF

    lm317

    Abstract: TIP73 LM317 circuit diagram schematic lm317 a 8 terminal LM317 application note 12v battery charger lm317 lm317 02 charging circuit lm317 LM317 application data application notes for lm317
    Contextual Info: LM317 3-TERMINAL ADJUSTABLE REGULATOR SLVS044I – SEPTEMBER 1997 – REVISED MARCH 2002 D D D D D D Output Voltage Range Adjustable From 1.2 V to 37 V Output Current Greater Than 1.5 A Internal Short-Circuit Current Limiting Thermal Overload Protection Output Safe-Area Compensation


    Original
    lm317slvs044iot-223o-220ab+9tip73lm317 circuit diagram schematiclm317 a 8 terminallm317 application note12v battery charger lm317lm317 02charging circuit lm317lm317 application dataapplication notes for lm317 PDF

    LM317KC

    Abstract: LM317KC PLASTIC lm317
    Contextual Info: LM317 3-TERMINAL ADJUSTABLE REGULATOR www.ti.com SLVS044R – SEPTEMBER 1997 – REVISED APRIL 2007 FEATURES • • Output Voltage Range Adjustable From 1.25 V to 37 V Output Current Greater Than 1.5 A Internal Short-Circuit Current Limiting Thermal Overload Protection


    Original
    lm317slvs044rot-223o-220+3o-263lm317kclm317kc plastic PDF

    Contextual Info: LM317 3-TERMINAL ADJUSTABLE REGULATOR www.ti.com SLVS044Q – SEPTEMBER 1997 – REVISED OCTOBER 2005 FEATURES • • • Output Voltage Range Adjustable From 1.25 V to 37 V Output Current Greater Than 1.5 A Internal Short-Circuit Current Limiting • •


    Original
    lm317slvs044qo-220ot-223 PDF

    LM317KC PLASTIC

    Abstract: lm317 charging circuit lm317 capacitor 223
    Contextual Info: LM317 3-TERMINAL ADJUSTABLE REGULATOR www.ti.com SLVS044R – SEPTEMBER 1997 – REVISED APRIL 2007 FEATURES • • Output Voltage Range Adjustable From 1.25 V to 37 V Output Current Greater Than 1.5 A Internal Short-Circuit Current Limiting Thermal Overload Protection


    Original
    lm317slvs044rot-223o-220+4o-263lm317kc plasticcharging circuit lm317capacitor 223 PDF

    lm317

    Abstract: IC LM317 1N4002 LM317DCY LM317DCYR LM317KC LM317KCS LM317KTER of ic LM317 LM317 sot-223
    Contextual Info: LM317 3-TERMINAL ADJUSTABLE REGULATOR www.ti.com SLVS044Q – SEPTEMBER 1997 – REVISED OCTOBER 2005 FEATURES • • • Output Voltage Range Adjustable From 1.25 V to 37 V Output Current Greater Than 1.5 A Internal Short-Circuit Current Limiting • •


    Original
    lm317slvs044qo-220ot-223+9ic lm3171n4002lm317dcylm317dcyrlm317kclm317kcslm317kterof ic lm317lm317 sot-223 PDF

    LM317

    Abstract: 6v BATTERY CHARGING CIRCUIT lm317 TIP73 LM317KC tl080 equivalent 1N4002 2N2905 LM317DCY LM317DCYR LM317KTER
    Contextual Info: LM317 3-TERMINAL ADJUSTABLE REGULATOR SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001 D D D D D D Output Voltage Range Adjustable From 1.2 V to 37 V Output Current Greater Than 1.5 A Internal Short-Circuit Current Limiting Thermal Overload Protection


    Original
    lm317slvs044hot-223o-220ab+96v battery charging circuit lm317tip73lm317kctl080 equivalent1n40022n2905lm317dcylm317dcyrlm317kter PDF

    LM317

    Abstract: functions of ic lm317 pin diagram ic lm317 IC LM317 DATA SHEET LM317DCY LM317DCYR LM317KC LM317KCS LM317KTER LM317KTTR
    Contextual Info: LM317 www.ti.com. SLVS044U – SEPTEMBER 1997 – REVISED APRIL 2008 3-TERMINAL ADJUSTABLE REGULATOR FEATURES 1 • Output Voltage Range Adjustable From 1.25 V


    Original
    lm317slvs044uo-220ot-223+10o-263functions of ic lm317pin diagram ic lm317ic lm317 data sheetlm317dcylm317dcyrlm317kclm317kcslm317kterlm317kttr PDF