component
OPA1678
Public Made by Adomby adom
TI dual audio op-amp, SOIC-8. Low noise, low distortion, rail-to-rail output, 2.25-5.5 V. Datasheet-verified.
3D Model
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Symbol & Footprint
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Datasheet
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README
markdownOPA1678
Texas Instruments · Audio operational amplifier · SOIC-8
Dual op-amp tuned for audio: low input voltage noise, low total harmonic distortion, and a rail-to-rail output, on a modest 2.25 to 5.5 V single supply. That makes it a good active filter, line driver, and headphone-buffer front end for portable and line-level audio where a classic NE5532 needs more supply and headroom. Both amplifiers share the standard dual SOIC-8 pinout. A low-cost, low-distortion audio dual for battery and single-supply designs.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | OUT A | output | Output of channel A op-amp. Rail-to-rail output stage swings within 800 mV of the supply rails into a 2-kΩ load. |
| 2 | -IN A | input | Inverting input of channel A op-amp. High-impedance input, typical input bias current 10 pA. |
| 3 | +IN A | input | Noninverting input of channel A op-amp. High-impedance input, typical input bias current 10 pA. |
| 4 | V- | power_in | Negative (lowest) power supply. Operates from -18 V to 0 V in split-supply mode or tied to GND in single-supply operation (total supply 4.5 V to 36 V). |
| 5 | +IN B | input | Noninverting input of channel B op-amp. High-impedance input, typical input bias current 10 pA. |
| 6 | -IN B | input | Inverting input of channel B op-amp. High-impedance input, typical input bias current 10 pA. |
| 7 | OUT B | output | Output of channel B op-amp. Rail-to-rail output stage swings within 800 mV of the supply rails into a 2-kΩ load. |
| 8 | V+ | power_in | Positive (highest) power supply. ±2.25 V to ±18 V split, or 4.5 V to 36 V single-supply with V- at GND. Quiescent current ~2 mA per channel. |
Key specifications
| Parameter | Value |
|---|---|
| Type | Dual audio op-amp |
| Input noise | 4.5 nV/rtHz |
| THD+N | 0.00006% (typ) |
| Gain-bandwidth | 16 MHz |
| Output | Rail-to-rail |
| Supply | 2.25-5.5 V |
| Package | SOIC-8 |
Ordering variants
Same part, different packaging or reel option.
OPA1678IDR (SOIC-8)OPA1678IDGKR (VSSOP-8)OPA1679IDR (quad, SOIC-14)
CAD (KiCad official)
- Symbol:
Amplifier_Operational:OPA1678 (KiCad official) - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (56 pp, sha256
4072daad4ebc4ec9, 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).