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AD8421BRZ-R7

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Analog Devices Instrumentation Amplifiers, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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AD8421BRZ-R7

Analog Devices · Instrumentation Amplifiers · SOIC-8

AD8421BRZ-R7 from Analog Devices, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 -IN input Negative input pin of the instrumentation amplifier.
2 RG passive Gain-setting pin; a resistor placed between RG pins sets the gain as G = 1 + (9.9 kΩ/RG).
3 RG passive Gain-setting pin; a resistor placed between RG pins sets the gain as G = 1 + (9.9 kΩ/RG).
4 +IN input Positive input pin of the instrumentation amplifier.
5 -VS power_in Negative power supply pin.
6 REF input Reference voltage pin; drive it from a low-impedance voltage source to level-shift the output.
7 VOUT output Amplifier output pin.
8 +VS power_in Positive power supply pin.

Key specifications

Parameter Value
Manufacturer Analog Devices
Package SOIC-8
Category Amplifiers/Comparators
Pins 8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Common-mode rejection ratio, G=1 CMRR 94 dB DC to 60 Hz, 1 kΩ unbalanced source, VCM = −10 V to +10 V, G = 1 3
Common-mode rejection ratio, G=10 CMRR 114 dB DC to 60 Hz, 1 kΩ unbalanced source, VCM = −10 V to +10 V, G = 10 3
Common-mode rejection ratio, G=100 CMRR 134 dB DC to 60 Hz, 1 kΩ unbalanced source, VCM = −10 V to +10 V, G = 100 3
Common-mode rejection ratio, G=1000 CMRR 140 dB DC to 60 Hz, 1 kΩ unbalanced source, VCM = −10 V to +10 V, G = 1000 3
Common-mode rejection ratio, G=1, full temperature CMRR 93 dB DC to 60 Hz, 1 kΩ unbalanced source, G = 1, TA = −40°C to +85°C 3
Common-mode rejection ratio at 20 kHz, G=1 CMRR 80 dB 20 kHz, VCM = −10 V to +10 V, G = 1 3
Common-mode rejection ratio at 20 kHz, G=10 CMRR 100 dB 20 kHz, VCM = −10 V to +10 V, G = 10 3
Common-mode rejection ratio at 20 kHz, G=100 CMRR 110 dB 20 kHz, VCM = −10 V to +10 V, G = 100 3
Common-mode rejection ratio at 20 kHz, G=1000 CMRR 120 dB 20 kHz, VCM = −10 V to +10 V, G = 1000 3
Input voltage noise density eni 3 3.2 nV/√Hz 1 kHz, VIN+, VIN− = 0 V 3
Input voltage noise, 0.1 Hz to 10 Hz, G=1 2 2.2 µV p-p RTI, f = 0.1 Hz to 10 Hz, G = 1 3
Input voltage noise, 0.1 Hz to 10 Hz, G=100 to 1000 0.07 0.09 µV p-p RTI, f = 0.1 Hz to 10 Hz, G = 100 to 1000 3
Input offset voltage VOSI 25 µV VS = ±5 V to ±15 V 3
Input offset voltage, full temperature range VOSI 45 µV TA = −40°C to +85°C 3
Input offset voltage average temperature coefficient VOSI 0.2 µV/°C 3
Output offset voltage VOSO 250 µV 3
Output offset voltage, full temperature range VOSO 0.45 mV TA = −40°C to +85°C 3
Output offset voltage average temperature coefficient VOSO 5 µV/°C 3
Power supply rejection ratio (RTI), G=1 PSR 100 120 dB VS = ±2.5 V to ±18 V, G = 1 3
Power supply rejection ratio (RTI), G=10 PSR 120 140 dB VS = ±2.5 V to ±18 V, G = 10 3
Power supply rejection ratio (RTI), G=100 PSR 140 150 dB VS = ±2.5 V to ±18 V, G = 100 3
Power supply rejection ratio (RTI), G=1000 PSR 140 150 dB VS = ±2.5 V to ±18 V, G = 1000 3
Input bias current 0.1 0.5 nA 3
Input bias current, full temperature range 6 nA TA = −40°C to +85°C 3
Input offset current 0.1 0.5 nA 3
Input offset current, full temperature range 0.8 nA TA = −40°C to +85°C 3
Gain range 1 10000 V/V 4
Gain error, G=1 0.01 % VOUT = ±10 V, G = 1 4
Gain error, G=10 to 1000 0.1 % VOUT = ±10 V, G = 10 to 1000 4
Gain nonlinearity, G=1 1 3 ppm VOUT = −10 V to +10 V, RL = 600 Ω, G = 1 4
Gain nonlinearity, G=10 to 1000 30 50 ppm VOUT = −10 V to +10 V, RL ≥ 600 Ω, G = 10 to 1000 4
Gain drift vs temperature, G=1 0.1 1 ppm/°C G = 1 4
Dual supply operating range 2.5 18 V Dual supply (±VS) 5
Single supply operating range 5 36 V Single supply 5
Quiescent supply current 2 2.3 mA 5
Quiescent supply current, full temperature range 2.6 mA TA = −40°C to +85°C 5
Rated performance temperature range -40 85 °C 5
Operating temperature range -40 125 °C Footnote 5: 85°C to 125°C characteristics in typical performance section 5
Reference input current IIN 20 24 µA VIN+, VIN− = 0 V 4
Output reference gain -0.0001 1 0.0001 V/V Printed as 1 ± 0.0001 4
Supply voltage (absolute maximum) -18 18 V Printed as ±18 V 8
Storage temperature range -65 150 °C 8
Operating temperature range (absolute maximum) -40 125 °C 8
Maximum junction temperature 150 °C 8
ESD, human body model 2 kV Human body model 8
Output voltage noise density eno 60 nV/√Hz 1 kHz 3
Current noise spectral density 200 fA/√Hz f = 1 kHz 3
Small-signal bandwidth, G=1 10 MHz −3 dB, G = 1 4
Small-signal bandwidth, G=10 10 MHz −3 dB, G = 10 4
Small-signal bandwidth, G=100 2 MHz −3 dB, G = 100 4
Small-signal bandwidth, G=1000 0.2 MHz −3 dB, G = 1000 4
0.001% settling time, G=1 1 µs 10 V step, G = 1 4
0.001% settling time, G=10 0.6 µs 10 V step, G = 10 4
0.001% settling time, G=100 0.8 µs 10 V step, G = 100 4
0.001% settling time, G=1000 6 µs 10 V step, G = 1000 4
Slew rate 35 V/µs G = 1 to 100 4
Differential input impedance (resistance) 30 GΩ Printed as 30//3 GΩ//pF 4
Differential input impedance (capacitance) 3 pF Printed as 30//3 GΩ//pF 4
Thermal resistance, junction-to-ambient (8-lead SOIC) θJA 107.8 °C/W 4-layer JEDEC PCB, still air 8
Short-circuit current 65 mA 4

CAD (KiCad official)

  • Symbol: AD8421BRZ-R7
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: ad8421brz-r7-etched.step / ad8421brz-r7-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ad8421brz-r7.step / ad8421brz-r7.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Analog Devices datasheet (28 pp, sha256 cee2fa8289e5925e, retrieved 2026-10-18, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF