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OPA1656 Dual Audio Op-Amp

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by Ray

Dual low-noise, low-distortion CMOS audio op-amp with high output drive.

op-ampaudioduallow-noisecmostisoic-8
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README

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OPA1656

Texas Instruments · Operational Amplifier · SOIC-8

The OPA1656 is a dual audio operational amplifier that combines the low noise of bipolar-input parts (2.9 nV/sqrt(Hz)) with the high input impedance of CMOS. Its low distortion, wide bandwidth, and ability to drive low-impedance loads suit high-fidelity preamplifiers, active filters, and headphone drivers.

Pinout

Pin Name Type Function
1 OUT A output Output, channel A. Rail-to-rail output capable of sourcing/sinking 100 mA and swinging to within 250 mV of the rails with a 2-kΩ load.
2 -IN A input Inverting input, channel A. High-impedance FET input (100 MΩ differential
3 +IN A input Noninverting input, channel A. High-impedance FET input; common-mode range (V-) to (V+) - 2.25 V.
4 V- power_in Negative (lowest) power supply. Dual-supply range ±2.25 V to ±18 V or single-supply 4.5 V to 36 V referenced with V+.
5 +IN B input Noninverting input, channel B. High-impedance FET input; common-mode range (V-) to (V+) - 2.25 V.
6 -IN B input Inverting input, channel B. High-impedance FET input, input bias current typically ±10 pA.
7 OUT B output Output, channel B. Rail-to-rail output capable of 100 mA drive; swings to within 250 mV of the rails into a 2-kΩ load.
8 V+ power_in Positive (highest) power supply. Supply range 4.5 V to 36 V single-supply or ±2.25 V to ±18 V dual-supply. Quiescent current 3.9 mA per channel.

Key specifications

Parameter Value
Type Dual CMOS audio op-amp
Input noise voltage 2.9 nV/sqrt(Hz)
THD+N 0.00005% typ
Gain-bandwidth product 53 MHz typ
Slew rate 24 V/us typ
Supply voltage +-2.25 V to +-18 V
Operating temperature -40 C to 125 C

Ordering variants

Same part, different packaging or reel option.

  • OPA1656D
  • OPA1656DR

CAD (KiCad official)

  • Symbol: opa1656.kicad_sym
  • Footprint: opa1656.kicad_mod
  • 3D model: SOIC-8 body from KiCad Package_SO/SOIC-8_3.9x4.9mm_P1.27mm.

Provenance

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

  • Datasheet: Texas Instruments datasheet (42 pp, sha256 4243b58e553e6f27, 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).

Datasheet PDF