component
AD623
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ADI single-supply instrumentation amplifier, SOIC-8. Gain set by one resistor, rail-to-rail output, 3-12 V. Datasheet-verified.
3D Model
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Symbol & Footprint
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Datasheet
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README
markdownAD623
Analog Devices · Instrumentation amplifier · SOIC-8
Instrumentation amplifier that takes a small differential signal, from a bridge, thermocouple, or shunt, and amplifies it against a reference, rejecting the common-mode voltage. One external resistor between the RG pins sets the gain from 1 to 1000, and the REF pin positions the output within a single supply, so it works on 3 to 12 V rails with a rail-to-rail output. It runs from a single or dual supply at low current. A standard front end for sensor bridges.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | -RG | passive | Inverting terminal of the external gain-setting resistor R_G. Connect R_G between Pin 1 and Pin 8 to set gain G = 1 + 100 kΩ/R_G (1 to 1000). Leave open for unity gain. |
| 2 | -IN | input | Inverting in-amp input. Differential input pair with Pin 3 (+IN); common-mode range extends 150 mV below -V_S. Input bias current typ 17 nA. |
| 3 | +IN | input | Noninverting in-amp input. Differential input pair with Pin 2 (-IN); common-mode range extends 150 mV below -V_S. Input bias current typ 17 nA. |
| 4 | -VS | power_in | Negative supply terminal. Connect to ground for single-supply operation (2.7 V to 12 V total) or to a negative rail for dual-supply operation (±2.5 V to ±6 V). Quiescent current 550 µA max. |
| 5 | REF | input | In-amp output reference input. Sets the DC offset of the output; drive from a low-impedance source. V_REF establishes the common-mode voltage of the output signal. |
| 6 | OUTPUT | output | In-amp output. Rail-to-rail swing; with R_L = 10 kΩ, output swings to within 0.2 V of each rail. 800 kHz small-signal bandwidth at G = 1. |
| 7 | +VS | power_in | Positive supply terminal. Total supply (+V_S to -V_S) 2.7 V to 12 V. Bypass locally with a 0.1 µF ceramic capacitor to ground. |
| 8 | +RG | passive | Noninverting terminal of the external gain-setting resistor R_G. Connect R_G between Pin 1 and Pin 8; leave open for G = 1. |
Key specifications
| Parameter | Value |
|---|---|
| Type | Instrumentation amplifier |
| Gain | 1 to 1000 (one external resistor) |
| Supply | Single 3-12 V or dual +/-2.5 to +/-6 V |
| Output | Rail-to-rail |
| CMRR | 90 dB (min, G=1) |
| Supply current | 575 uA (max) |
| Package | SOIC-8 |
Ordering variants
AD623ARZ (SOIC-8)AD623ANZ (PDIP-8)AD623ARMZ (MSOP-8)
CAD (KiCad official)
- Symbol:
Amplifier_Instrumentation:AD623 (KiCad official) - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
ad623-etched.step/ad623-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ad623.step/ad623.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (32 pp, sha256
44f12008011b61f7, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).