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Bare Die Product Detail: U421

N-Channel Dual Monolithic:
Monolithic Dual N-Channel JFET amplfier - Low leakage, low drift. The U421 monolithic dual n-channel JFET provides very high input impedance for differential amplification & impedance matching. Gate current is low specified at -250 fA.

Featuring high input impedance, hign gain, low power operation this part is a direct replacement for Interfet, Intersil, Motorola, National / Fairchild, Philips, Vishay / Siliconix U421.

Features:

High slew rate
High input impedance I_G -0.25pA (MAX)
Low offset / drift voltage

Applications:

Ultra-low input current differential amplifiers
High-speed temperature compensated single-ended input amplifiers
High-speed comparators
Impedance conV/√Hzerters
Vibration detectors

Test conditions:

BV_GSS -40V @ I_G = -1 nA, V_DS = 0V
I_GSS(MAX) -1 pA @ V_GS = -20V, V_DS = 0V
|V_GS1-V_GS2|_(MAX) 10mV @ V_DG = 10V, I_D = 30 µA
∆|V_GS1-V_GS2|/∆T 10 µV°C @ V_GD = 10V, I_D = 30µA, -55°C to +125°C
V_P(MIN) -0.4V @ V_DS = 10V, I_D = 1 nA
V_P(MAX) -2V @ V_DS = 10V, I_D = 1 nA
I_DSS(MIN) 0.1mA @ V_DS = 10V, V_GS = 0V
I_DSS(MAX) 1mA @ V_DS = 10V, V_GS = 0V
G_fs(MIN) 300µS @ V_DS = 10V, V_GS = 0V, f = 1kHz
e_n(TYP) 10nV/√Hz @ V_DG = 10V, I_D = 30µA, f = 1kHz
C_ISS(MAX) 3pF @ V_DS = 10V, I_D = µA, V_GS = 0V, f = 1MHz
C_RSS(MAX) 1.5pF @ V_DS = 10V, V_GS = 0V, I_D = µA, f = 1MHz

Vendor:
Linear Systems
Electrical Datasheet

Die Physical Data:
Footprint: 0.284mm² (440mil²)
Request Pad Layout

Product Families: Used for this device are tabulated below.

N-Channel Dual Monolithic

Functional:

Type: Low Leakage

Specification:

BV_GSS: -40V
I_GSS: -1pA
|V_GS1-V_GS2|: 10mV
∆|V_GS1-V_GS2|/∆T: 10µV/°C
V_{GS(OFF) MIN}: -0.40V
V_{GS(OFF) MAX}: -2.0V
I_DSS(MIN): 0.06mA
I_DSS(MAX): 1.0mA
g_fs(MIN): 300µS
e_n: 10.0nV√Hz
C_ISS(MAX): 3pF
C_RSS(MAX): 1.5pF

Other Detail: Important information for this device is tabulated below.

Traffic light setting for Minimum Order Quantity indicates the following:

Green:Available from stock or at low factory MOQ.
Amber: Available on factory order with MOQ.
Red: High factory MOQ may apply, please ask for details.

Traffic light setting for High Reliability indicates the following:

Green: This bare die is specified and tested for use in high reliability applications.
Amber: This bare die can meet higher reliability specifications with additional testing & qualification, please ask for details.
Red: This bare die is not specified or specifically designed for use in high reliability applications.

Traffic light setting for Space Grade indicates the following:

Green: This bare die is qualified for space applications or has space level qualification data, please ask for details.
Amber: This bare die can be specified for space applications with additional testing and qualification, please ask for details.
Red: Suitability of this bare die for space applications is unknown and requires further qualification, please ask for details.