Part Number VGS(off) V(BR)GSS (mS) (pA) U421 U423 -0.4 -0.4 -0.25
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Monolithic Channel JFET Duals
Part Number VGS(off) V(BR)GSS (mS) (pA)
U421 U423 -0.4 -0.4 -0.25 -0.25
Siliconix
U421/423
jVGS1 VGS2j (mV)
Features
Monolithic Design High Slew Rate Offset/Drift Voltage Gate Leakage: Noise High CMRR:
Benefits
Applications
Ultralow Input Current Tight Differential Match Current Differential Amps Improved Speed, Settling Time Accuracy High Speed Comparators Minimum Input Error/Trimming Requirement Impedance Converters Insignificant Signal Loss/Error Voltage High System Sensitivity Minimum Error with Large Input Signal
Description
U421/423 monolithic dual channel JFETs designed provide very high input impedance differential amplification impedance matching. Among many unique features, this series offers operating gate current specified -250 hermetic package available with full military processing (see Military Information). similar products noise U/SST401 series high gain 2N5911/5912 data sheets.
Case, Substrate View
Absolute Maximum Ratings
Gate Drain, Gate Source Voltage Gate Gate Voltage Gate Current Lead Temperature (1/16" from case sec.) Storage Temperature 200_C Operating Junction Temperature 150_C P-37514-Rev. (07/25/94) Power Dissipation Sidea Totalb
Notes Derate mW/_C above 25_C Derate mW/_C above 25_C
U421/423
Specificationsa
Limits
U421
Siliconix
U423
Parameter Static
Gate Source Breakdown Voltage Gate Gate Breakdown Voltage Gate Source Cutoff Voltage Saturation Drain Current Gate Reverse Current Gate Operating Current Drain Source Resistance Gate Source Voltage Gate Source Forward Voltage
Symbol
Test Conditions
Typb
Unit
V(BR)GSS V(BR)G1 VGS(off) IDSS IGSS rDS(on) VGS(F)
125_C 125_C
-1.2 -0.6 -0.3 -0.2 -150 2000 -0.8
-0.4 1000 -0.25 -250
-0.4 1000 -0.25 -250 -1.8 -1.8
Dynamic
Common Source Forward Transconductance Common Source Output Conductance Common Source Forward Transconductance Common Source Output Conductance Common Source Input Capacitance Common Source Reverse Transfer Capacitance Equivalent Input Noise Voltage Noise Figure Ciss Crss 0.12 0.35 0.12 0.35
Matching
Differential Gate Source Voltage Gate Source Voltage Differential Change with Temperature Common Mode Rejection Ratio |VGS1 VGS2| 125_C mV/_C
D|VGS1 VGS2| CMRR
Notes 25_C unless otherwise noted. Typical values DESIGN ONLY, guaranteed subject production testing.
P-37514-Rev. (07/25/94)
Siliconix
U421/423
Forward Transconductance (mS) IDSS Gate Leakage 25_C IGSS 25_C
Typical Characteristics
Saturation Drain Current (mA)
Drain Current Transconductance Gate Source Cutoff Voltage
Gate Leakage Current
125_C
IGSS
IDSS
VGS(off) Gate Source Cutoff Voltage
Drain Gate Voltage
Output Characteristics
VGS(off)
Output Characteristics
VGS(off) -1.5
Drain Current (mA)
-0.1
Drain Current (mA)
-0.2 -0.4 -1.0 -0.6 -0.8
-0.2 -0.3 -0.4 -0.5 -0.6 -0.7
Drain Source Voltage
Drain Source Voltage
0.25
Output Characteristics
VGS(off) -0.1 -0.2 Drain Current (mA)
Output Characteristics
VGS(off) -1.5
Drain Current (mA)
0.15
-0.3 -0.4 -0.5 -0.6 -0.7
-0.2 -0.4 -0.6
-0.8 -1.0
Drain Source Voltage P-37514-Rev. (07/25/94)
Drain Source Voltage
U421/423
Typical Characteristics (Cont'd)
Siliconix
Gate Source Differential Voltage Drain Current
25_C (mV) U423
Transfer Characteristics
VGS(off) -55_C 25_C
Drain Current (mA)
VGS1 VGS2 U421
125_C
-0.2
-0.4
-0.6
-0.8
Drain Current (mA)
1000
Gate Source Voltage
Voltage Differential with Temperature Drain Current
125_C 25_C CMRR (dB)
Common Mode Rejection Ratio Drain Current
CMRR DVDG VGS1 VGS2
DVDG
VGS1 VGS2
U423
U421 Drain Current (mA) 1000 Drain Current (mA) 1000
Voltage Gain
RLgos Assume
rDS(on) Drain Source Resistance
Circuit Voltage Gain Drain Current
Resistance Drain Current
VGS(off)
VGS(off) -1.5
-1.5
Drain Current (mA)
1000
0.01
Drain Current (mA)
P-37514-Rev. (07/25/94)
Siliconix
U421/423
Crss Reverse Feedback Capacitance (pF)
Typical Characteristics (Cont'd)
Ciss Input Capacitance (pF)
Common Source Input Capacitance Gate Source Voltage
Common Source Reverse Feedback Capacitance Gate Source Voltage
Gate Source Voltage
Gate Source Voltage
Output Conductance (mS)
Output Conductance Drain Current
VGS(off)
Noise Voltage
Equivalent Input Noise Voltage Frequency
-55_C 125_C Drain Current (mA) 1000 25_C
Frequency (Hz)
rDS(on) Drain Source Resistance
Forward Transconductance (mS)
Common Source Forward Transconductance Drain Current
VGS(off)
Resistance Output Conductance Gate Source Cutoff Voltage
Output Conductance (mS)
-55_C 25_C 125_C
VGS(off) Gate Source Cutoff Voltage
Drain Current (mA)
1000
P-37514-Rev. (07/25/94)
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