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

    NJM4556A Search Results

    NJM4556A Datasheets (16)

    New Japan Radio
    Part ECAD Model Manufacturer Description Datasheet Type PDF PDF Size Page count
    NJM4556A
    New Japan Radio DUAL HIGH CURRENT OPERATIONAL AMPLIFIER Original PDF 244.74KB 5
    NJM4556AD
    New Japan Radio Dual High Current Operational Amplifier Original PDF 174.3KB 4
    NJM4556AD
    New Japan Radio DUAL HIGH CURRENT OPERATIONAL AMPLIFIER Original PDF 244.75KB 5
    NJM4556AD
    New Japan Radio Cross Reference Guide Original PDF 81.82KB 28
    NJM4556AD
    New Japan Radio HIGH CURRENT DUAL OPERATIONAL AMPLIFIER Scan PDF 129.52KB 4
    NJM4556AL
    New Japan Radio Dual High Current Operational Amplifier Original PDF 174.3KB 4
    NJM4556AL
    New Japan Radio DUAL HIGH CURRENT OPERATIONAL AMPLIFIER Original PDF 244.75KB 5
    NJM4556AL
    New Japan Radio HIGH CURRENT DUAL OPERATIONAL AMPLIFIER Scan PDF 129.52KB 4
    NJM4556AM
    New Japan Radio Dual High Current Operational Amplifier Original PDF 174.3KB 4
    NJM4556AM
    New Japan Radio DUAL HIGH CURRENT OPERATIONAL AMPLIFIER Original PDF 244.75KB 5
    NJM4556AM
    New Japan Radio Cross Reference Guide Original PDF 81.82KB 28
    NJM4556AM
    New Japan Radio HIGH CURRENT DUAL OPERATIONAL AMPLIFIER Scan PDF 129.52KB 4
    NJM4556AV
    New Japan Radio Dual High Current Operational Amplifier Original PDF 174.3KB 4
    NJM4556AV
    New Japan Radio DUAL HIGH CURRENT OPERATIONAL AMPLIFIER Original PDF 244.75KB 5
    NJM4556AV
    New Japan Radio HIGH CURRENT DUAL OPERATIONAL AMPLIFIER Scan PDF 129.52KB 4
    NJM4556AV-TE2
    New Japan Radio IC OPAMP GP 2 CIRCUIT 8SSOP Original PDF 404.84KB
    SF Impression Pixel

    NJM4556A Price and Stock

    Nisshinbo Micro Devices

    Nisshinbo Micro Devices NJM4556AV-TE2

    Op Amp Dual High Gain Amplifier ±18V 8-Pin SSOP T/R
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Verical NJM4556AV-TE2 1,760 7
    • 1 -
    • 10 $0.54
    • 100 $0.49
    • 1000 $0.49
    • 10000 $0.49
    Buy Now
    Arrow Electronics NJM4556AV-TE2 Cut Strips 1,760 26 Weeks 7
    • 1 -
    • 10 $0.54
    • 100 $0.49
    • 1000 $0.49
    • 10000 $0.49
    Buy Now
    Newark NJM4556AV-TE2 Tape & Reel 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.45
    Buy Now
    Onlinecomponents.com NJM4556AV-TE2
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.31
    Buy Now

    Nisshinbo Micro Devices NJM4556AV-TE1

    Op Amp Dual High Gain Amplifier ±18V 8-Pin SSOP T/R
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Verical NJM4556AV-TE1 1,071 5
    • 1 -
    • 10 $0.91
    • 100 $0.82
    • 1000 $0.82
    • 10000 $0.82
    Buy Now
    Avnet Americas NJM4556AV-TE1 Tape & Reel 16 Weeks 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.43
    Buy Now
    Mouser Electronics NJM4556AV-TE1 1,808
    • 1 $1.03
    • 10 $0.74
    • 100 $0.58
    • 1000 $0.52
    • 10000 $0.44
    Buy Now
    Arrow Electronics NJM4556AV-TE1 Cut Strips 1,071 26 Weeks 4
    • 1 -
    • 10 $0.91
    • 100 $0.82
    • 1000 $0.82
    • 10000 $0.82
    Buy Now
    Newark NJM4556AV-TE1 Tape & Reel 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.45
    Buy Now
    Onlinecomponents.com NJM4556AV-TE1
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.49
    • 10000 $0.44
    Buy Now
    EBV Elektronik NJM4556AV-TE1 13 Weeks 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote

    Nisshinbo Micro Devices NJM4556AM

    Op Amp Dual High Gain Amplifier ±18V 8-Pin DMP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Verical NJM4556AM 1,009 6
    • 1 -
    • 10 $0.66
    • 100 $0.60
    • 1000 $0.60
    • 10000 $0.60
    Buy Now
    Avnet Americas NJM4556AM Tape & Reel 16 Weeks 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.43
    Buy Now
    Arrow Electronics NJM4556AM 1,009 26 Weeks 6
    • 1 -
    • 10 $0.66
    • 100 $0.60
    • 1000 $0.60
    • 10000 $0.60
    Buy Now
    Onlinecomponents.com NJM4556AM
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.49
    • 10000 $0.44
    Buy Now
    Quest Components NJM4556AM 1,056
    • 1 $1.41
    • 10 $1.41
    • 100 $0.70
    • 1000 $0.56
    • 10000 $0.56
    Buy Now

    Nisshinbo Micro Devices NJM4556AM-TE1

    Op Amp Dual High Gain Amplifier ±18V 8-Pin DMP T/R
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Verical NJM4556AM-TE1 691 5
    • 1 -
    • 10 $0.89
    • 100 $0.80
    • 1000 $0.80
    • 10000 $0.80
    Buy Now
    Avnet Americas NJM4556AM-TE1 Tape & Reel 16 Weeks 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.42
    Buy Now
    Arrow Electronics NJM4556AM-TE1 Cut Strips 691 26 Weeks 4
    • 1 -
    • 10 $0.89
    • 100 $0.80
    • 1000 $0.80
    • 10000 $0.80
    Buy Now
    Newark NJM4556AM-TE1 Tape & Reel 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.45
    Buy Now
    Onlinecomponents.com NJM4556AM-TE1
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.48
    • 10000 $0.44
    Buy Now
    EBV Elektronik NJM4556AM-TE1 13 Weeks 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote

    Nisshinbo Micro Devices NJM4556AD

    Op Amp Dual High Gain Amplifier ±18V 8-Pin PDIP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Verical NJM4556AD 536 431
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.78
    • 10000 $0.78
    Buy Now
    Avnet Americas NJM4556AD Tape & Reel 16 Weeks 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.49
    • 10000 $0.44
    Buy Now
    Rochester Electronics NJM4556AD 536 1
    • 1 -
    • 10 -
    • 100 $0.70
    • 1000 $0.58
    • 10000 $0.52
    Buy Now
    Avnet Asia NJM4556AD 14 Weeks 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote

    NJM4556A Datasheets Context Search

    Catalog Datasheet Type Document Tags PDF

    4556AD

    Abstract: NJM4558 applications equivalent integrated 4556a njm4556as equivalent integrated njm4556a HJM4556AL HJM455BAH NJM455GAL NJM4556A NJM4556AM
    Contextual Info: NJM4556A DUAL HIGH CURRENT OPERATIONAL AMPLIFIER • GENERAL DESCRIPTION PACKAGE OUTLINE The N JM 4556A integrated circu it is a high-gain, high output current dual operational amplifier capable of driving ± 7 0 m A into 150 Cl loads ± 10.5V output voltage , and operating low supply voltage


    OCR Scan
    njm4556anjm4558djm4556ad--40db+94556adnjm4558 applicationsequivalent integrated 4556anjm4556asequivalent integrated njm4556ahjm4556alhjm455bahnjm455galnjm4556am PDF

    NJM4556AD

    Abstract: equivalent integrated njm4556a NJM4556AL NJM4558 applications NJM4556A NJM4556AM NJM4556AV NJM4558 SSOP8 Package
    Contextual Info: NJM4556A DUAL HIGH CURRENT OPERATIONAL AMPLIFIER • GENERAL DESCRIPTION The NJM4556A integrated circuit is a high-gain,high output current dual operational amplifier capable of driving ±70mA into 150Ω loads ±10.5V output voltage ,and operating low supply


    Original
    njm4556anjm4558rs10knjm4556ad+6equivalent integrated njm4556anjm4556alnjm4558 applicationsnjm4556amnjm4556avssop8 package PDF

    NJM4556A

    Abstract: NJM4556AD NJM4556AL RS10K NJM4556 NJM4556AM NJM4556AV NJM4558 NJM4556 S
    Contextual Info: NJM4556A 2 回路入り高出力電流オペアンプ • 概要 NJM4556AはNJM4558 の出力段の改良 IO=73mA typ. に加え、低 電圧からの動作 (V+/V-=±2V~)を可能にした2 回路入りオペアンプです。 位相補償回路を内蔵すると共にスルーレート 3V/ s、利得帯域幅積


    Original
    njm4556anjm4556anjm4558njm455610nv/hz+8njm4556adnjm4556amnjm4556avnjm4556alnjm4556ad/njm4556alrs10knjm4558njm4556 s PDF

    4556a

    Abstract: equivalent integrated 4556a fc 4558
    Contextual Info: HIGH CURRENT DUAL OPERATIONAL A M P LIFIER NJM4556A T he N JM 4556A integrated circuit is a high-gain, high output current dual operational amplifier capable o f driving ± 70m A into 15il loads ± 10.5V output voltage , and operating Low supply voltage ( V V V ~ = ± 2 V —).


    OCR Scan
    njm4556a150fi4556aequivalent integrated 4556a+1fc 4558 PDF

    RS10K

    Abstract: NJM4556AD NJM4556AL NJM4556 NJM4556A NJM4556AM NJM4556AV NJM4558
    Contextual Info: NJM4556A 2 回路入り高出力電流オペアンプ • 概要 NJM4556A はNJM4558 NJM4558 の出力段の改良 IO=73mA typ. に加え、低 + 電圧からの動作 (V /V =±2V~)を可能にした2 回路入りオペアンプです。 位相補償回路を内蔵すると共にスルーレート 3V/µs、利得帯域幅積


    Original
    njm4556anjm4558njm4556njm4556ad+4njm4556amnjm4556avnjm4556alrs10k PDF

    equivalent integrated njm4556a

    Abstract: NJM4556AL
    Contextual Info: NJM4556A DUAL HIGH CURRENT OPERATIONAL AMPLIFIER • GENERAL DESCRIPTION The NJM4556A integrated circuit is a high-gain,high output current dual operational amplifier capable of driving ±70mA into 150Ω loads ±10.5V output voltage ,and operating low supply


    Original
    njm4556anjm4558rs10kequivalent integrated njm4556a+1njm4556al PDF

    NJM4556

    Abstract: NJM4556AD NJM4556AL NJM4558 NJM4556A NJM4556AM NJM4556AV SSOP8
    Contextual Info: NJM4556A 2回路入り高出力電流オペアンプ • 概 要 NJM4556A はNJM4558 NJM4558 の出力段の改良 IO=73mA typ. に加え、低電圧からの動作(V+/V-=±2V~)を可能にした2 回路入りオペアンプです。 位相補償回路を内蔵すると共にスルーレート 3V/µs、利


    Original
    njm4556anjm4558njm4556njm4556ad+4njm4556amnjm4556avnjm4556alssop8 PDF

    NJM4556AL

    Abstract: NJM4556 NJM4556AD NJM4556A NJM4556AM NJM4556AV NJM4558 DSA0022633 SSOP8 Package
    Contextual Info: NJM4556A DUAL HIGH CURRENT OPERATIONAL AMPLIFIER • GENERAL DESCRIPTION The NJM4556A integrated circuit is a high-gain,high output current dual operational amplifier capable of driving ±70mA into 150Ω loads ±10.5V output voltage ,and operating low supply


    Original
    njm4556anjm4558rs10knjm4556al+6njm4556njm4556adnjm4556amnjm4556avdsa0022633ssop8 package PDF

    NJM4558AL

    Abstract: NJM4556S 4556S NJM4556D NJM4558 applications NJM4556A equivalent integrated njm4556a 100S equivalent integrated 4556a NJM4556AD
    Contextual Info: HIGH CURRENT DUAL OPERATIONAL AMPLIFIER NJM4556A T he NJM4556A integrated circuit is a high-gain, high output current dual operational amplifier capable of driving ± 70m A into 15ii loads ± 10.5V output voltage , and operating Low supply voltage (V+/ V - = ± 2 V ~ ) .


    OCR Scan
    njm4556anjm4558700mwnjm4558al+8njm4556s4556snjm4556dnjm4558 applicationsequivalent integrated njm4556a100sequivalent integrated 4556anjm4556ad PDF

    HJM4556A1

    Abstract: IJIM556 JII4556 NJM4556A NJM4556AL NJM4556AM
    Contextual Info: NJM4556A 2 0 S& A ‘J ft tu > -7 mm m NJM4556A1Ì, «JW 558<7 tì* ff>afeS lo = 70mAtyp.) C ip A , f f i * l± fr b COWfF ('V+/V - = ± 2 ~ ) £ ÜTÜ6 C L fc x i T Jl/>* JM M S8T * f° 3 V ///S , « 8 M H z t S ä - / A l ? « m i £ S f c f c 1 * * T l ' $ ( 7 ) T - ^ 4 ' l ' : ^ t t S I 5 n Dn


    OCR Scan
    njm4556ahjm4556a170matypnjm45s6ad+6njm4556amjm455gjwnjm4556al100s2ijim556jii4556 PDF

    equivalent integrated 4556a

    Abstract: 4556a
    Contextual Info: NJM4556A DUAL HIGH CURRENT OPERATIONAL AM PLIFIER • GENERAL DESCRIPTION ■ PACKAGE OUTLINE T he N JM 4556A integrated circuit is a high-gain, high output current dual operational amplifier capable of driving ± 70m A into 150 n loads ± 10.5V output voltage , and operating low supply voltage


    OCR Scan
    njm4556anjm455sequivalent integrated 4556a4556a PDF

    Contextual Info: NJM4556A DUAL HIGH CURRENT OPERATIONAL AMPLIFIER GENERAL DESCRIPTION The NJM4556A integrated circuit is a high-gain,high output current dual operational amplifier capable of driving ±70mA into 150 loads ±10.5V output voltage ,and operating low supply


    Original
    njm4556anjm4558 PDF

    equivalent integrated 4556a

    Abstract: 4556a NJM4558AL NJM4556S
    Contextual Info: HIGH CURRENT DUAL OPERATIONAL AMPLIFIER NJM4556A The NJM 4556A integrated circuit is a high-gain, high output current dual operational amplifier capable o f driving ± 70m A into 150 loads ±10.5V output voltage , and operating Low supply voltage (V+/ V - = ± 2 V ~ ) .


    OCR Scan
    njm4556anjm4558100s2equivalent integrated 4556a+34556anjm4558alnjm4556s PDF

    equivalent integrated njm4556a

    Abstract: NJM4556A
    Contextual Info: NJM4556A MEMO [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the


    Original
    njm4556aequivalent integrated njm4556a PDF

    NJM4558AD

    Abstract: njm4558a equivalent integrated njm4556a
    Contextual Info: NJM4556A DUAL HIGH CURRENT OPERATIONAL AM PLIFIER • GENERAL DESCRIPTION ■ PACKAGE OUTLINE The N JM 4556A integrated circuit is a high-gain, high output current dual operational amplifier capable of driving ± 70m A into 150 n loads ± 10.5V output voltage , and operating low supply voltage


    OCR Scan
    njm4556anjm4558njm4558adnjm4558a+1equivalent integrated njm4556a PDF

    NJM2900

    Abstract: NJM4556 NJM4587 NJM2048 NJM2049 NJM2359 NJM3414 NJM3415 NJMREF-01 NJU7283
    Contextual Info: NJM4587 N JM R EF-01 NJM2359 NJM4556 NJM3414 NJM3415 NJM2048 NJM2049 NJM2900 NJM3900 NJU7212 N JU 7283> < -X « ij r > r f tS S ,« NJM4556A NJM3414A NJM3414A m 2 I S B A 1) »ititi *^7 >7" 2 » A 0 * m íií^ r> 7 — >F n —/HBtëS 2 ¡ÜSX'f 4 W A 'i t t t - K * ^ r> y


    OCR Scan
    njm4587njmref-01njm2359njm4556+8njm4556anjm3414njm3414anjm3415njm2048njm2900njm2049nju7283 PDF

    3414a

    Abstract: 3404A ci 4558 NJM082B NJM2114 ci 741 f 4558 njm4560 application notes riaa 4558 NJM072B
    Contextual Info: 用 語 解 説 1.オペアンプの最大定格 + 1−1.電源電圧:V 1−1.電源電圧: /V ,VDD オペアンプの正電源電圧端子と負電源電圧端子間に印加できる最大電圧を規定します。単電源動作の場合は単に印加電圧を規定し,両電源


    Original
    njm2114njm5532300mwnjm072bnjm082b+13njm4558njm2043njm2904njm4559njm45603414a3404aci 4558njm2114ci 741f 4558njm4560 application notesriaa 4558 PDF

    NJM2125F

    Abstract: NJM2143R NJM2114D NJM2068D
    Contextual Info: • -f T fi - =j IS » » n « ft IK je V 1 - te ffl VIO typ. (mV) HO typ. (nA) Icc typ. (mA) G.B. typ. (MHz) NJM2125F M TP-5 + 2.7-20 2 5 1.0 1.2/fr 1.2 NJM2904D/M/V/L DÏP/DMP/SS0P/SIP-8 +3~+32 2 5 0.7 0.6 0.5 5 0.7 0.6 0.5 2 5 2.0 1.2/fr 1.2 5 4.0 1.3


    OCR Scan
    njm2125fnjm2904d/m/v/lnjm2143rnjm3404ad/m/v/l+8njm3414ad/m/v/lnjm2132d/m/v/l32nv/vnjm2119d/mnjm324d/m/vdip/dmp/ssop-14njm2114dnjm2068d PDF

    njm2068d

    Abstract: mz 72-18 NJM082BD NJM082D NJM2058D/M/V
    Contextual Info: G äD OPERATIONAL AMPLIFIER ELECTRICAL CHARACTERISTICS TABLE • Bipolar Power Supply Circuit FiixJions Single Supply Type Recommended Supply Voltage VIO typ mV IIO typ(nA) tec typ. (mA) 5 G.8. typ S.R. to (MHz) (V/uS) 0.5 NJM2904D/M/V/L DIP/DMP/SSOP/SIP-8


    OCR Scan
    njm2904d/m/v/lnjm3404ad/m/v/lnjm3414ad/m/v/1njm2132d/m/v/l+11njm2119d/mnjm324d/m/vdip/dmp/ssop14njm2112d/m/vnjm064d/mnjm074d/m/vnjm2068dmz 72-18njm082bdnjm082dnjm2058d/m/v 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

    ci 741

    Abstract: ic 741 riaa NJM082B ic NJM4560 NJM2043 NJM4558 ic 741 datasheet riaa NJM2114 njm2904 NJM072B
    Contextual Info: 用 語 解 説 1.オペアンプの最大定格 + 1-1.電源電圧:V /V ,VDD オペアンプの正電源電圧端子と負電源電圧端子間に印加できる最大電圧を規定します。単電源動作の場合は単に印加電圧を規定し,両電源


    Original
    njm2114njm5532300mwnjm072bnjm082b+10njm4558njm2043njm2904njm2902njm3403aci 741ic 741 riaaic njm4560ic 741 datasheet riaanjm2114 PDF

    UPC803C

    Abstract: uPC824C upc804c BA10324F TA7558S m5218l UPC452C M5218L equivalent uPC451g LM5223
    Contextual Info: OPERATIONAL AMPLIFIER CROSS REFERENCE • Bipolar NJRC Functions Single Supply Type Quad Type No. NJM2902N N•S LM2902N NJM2902M NJM3403AD NJM3405AM NJM324D NJM2143R NJM2904D LM2904N LM358N Input/Output Full Swing Trans conductance Single Low Noise Dual Dual


    Original
    njm2902nlm2902nnjm3405amnjm2143r+16njm2904dm5224ppc451cm5224fppc451gpc452cupc803cupc824cupc804cba10324fta7558sm5218lupc452cm5218l equivalentupc451glm5223 PDF

    KAD7001

    Abstract: SBX1610-52 sony SBX1610-52 LA2785 UPC177C ST L7805CV NJM79L05A SBX1810-52 sbx1610 MC34063P1
    Contextual Info: 12/11/02 NJR Corporation Cross Reference Guide Sorted by Part Number Winter 2003 Competing Part Number AD66761 AN1311 AN1311S AN1319 AN1319S AN1339 AN1339NS AN1393 AN1393NS AN1432 AN1458 AN1458S AN311 AN311S AN6572 AN7810 AN78L06 AN78L08 AN78L09 AN78L18 AN78L20


    Original
    ad66761an1311an1311san1319+16an1319san1339an1339nsan1393an1393nsan1432kad7001sbx1610-52sony sbx1610-52la2785upc177cst l7805cvnjm79l05asbx1810-52sbx1610mc34063p1 PDF

    4558D

    Abstract: 4556 op-amp IC 4558 surround sound circuit REGULATOR IC l7812cv TDA2822M SMD TYPE circuit inter CV 203 NE555N IC AUDIO FILTER NJM2060 "cross reference" IC L7912CV MC34063P1
    Contextual Info: NJR CORPORATION Product Reference Overview SEMICONDUCTORS LINEAR RF & WIRELESS PACKAGING 27 PART NUMBER SYSTEMS 33 CROSS REFERENCE 35 AUDIO ICs 8 COMMUNICATION ICs 9 VIDEO ICs 10 CMOS SWITCH 11 MCU & PERIPHERAL 13 LCD DRIVER 15 LSI/OTHER 16 SPECIAL FUNCTIONS


    Original
    o-220fo-220o-2524558d+94556 op-ampic 4558 surround sound circuitregulator ic l7812cvtda2822m smd typecircuit inter cv 203ne555n ic audio filternjm2060 "cross referenceic l7912cvmc34063p1 PDF