Datasheet IFN426, IFN425, IFN424 Datasheet (Interfet)

B-42 01/99

IFN424, IFN425, IFN426

Dual N-Channel Silicon Junction Field-Effect Transistor

¥ Very High Impedance

Differential Amplifiers

¥ Electrometers

At 25°C free air temperature: IFN424, IFN425, IFN426 Process NJ01
Static Electrical Characteristics Min Typ Max Unit Test Conditions

Gate Source Breakdown Voltage V
Gate to Gate Breakdown Voltage BV

Gate Reverse Current I

Gate Operating Current I
Gate Source Cutoff Voltage V

Gate Source Voltage V
Drain Saturation Current (Pulsed) I

(BR)GSS

G1G2

GSS

G

GS(OFF)
GS

DSS

Absolute maximum ratings at TA= 25¡C

Device Dissapation (Derate 3.2 mW/°C to 50°C) 400 mW
Total Device Dissipation (Derate 6 mW/°C to 150 °C) 750 mW
Storage Temperature Range – 60 °C to 200 °C

– 40 – 60 V IG= – 1 µA, VDS= ØV

±40 V IG= – 1 µA, ID= ØA, IS= ØA

– 3 pA VGS= – 20V, VDS= ØV
– 3 nA VGS= – 20V, VDS= ØV TA= +125°C

– 0.5 pA VDS= 10V, ID= 30 µA

– 500 pA VDS= 10V, ID= 30 µA TA= +125°C

– 0.4 – 3 V VDS= 10V, ID= 1 nA

– 2.9 V VDS= 10V, ID= 30 µA

60 1800 µA VDS= 10V, VGS= ØV

Dynamic Electrical Characteristics

Common Source Forward Transconductance g

Common Source Output Conductance g
Common Source Input Capacitance C

Common Source Reverse Transfer Capacitance C

Equivalent Short Circuit Input Noise Voltage ¯e

Noise Figure NF 1 dB

Differential Gate Source Voltage |V

Differential Gate Source Voltage |V
With Temperature

Common Mode Rejection Ratio CMRR 90 80 80 dB VDG= 10V to 20V, ID= 30 µA

fs
os
iss
rss

N

Max - IFN424 IFN425 IFN426

GS1–VGS2

GS1–VGS2

∆T

Min - IFN424 IFN425 IFN426

100 1500 µS VDS= 10V, VGS= ØV f = 1 kHz

3µSVDS= 10V, ID= 30 µA f = 1 kHz
3pFVDS= 10V, VGS= ØV f = 1 MHz

1.5 pF VDS= 10V, VGS= ØV f = 1 MHz

20 70 nV/√Hz VDS= 10V, ID= 30 µA f = 10 Hz

VDS= 10V, ID= 30 µA
RG= 1 MΩ

| 10 15 25 mV V

|

10 25 40 µV/°C VDG= 10V, ID= 30 µA TB= 25°C

TOÐ78 Package

See Section G for Outline Dimensions

= 10V, ID= 30 µA

DG

Pin Configuration

1 Source 1, 2 Drain 1, 3 Gate 1, 4 Case,
5 Source 2, 6 Drain 2, 7 Gate 2,
8 Omitted

f = 10 Hz

TA= – 55°C

TC= 125°C

1000 N. Shiloh Road, Garland, TX 75042
[phone] FAX [phone]

www.interfet.com