OPA1678

@@ -0,0 +1,52 @@+# OPA1678++**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++- `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](https://www.ti.com/lit/ds/symlink/opa1678.pdf) (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).++[Datasheet PDF](docs/opa1678-datasheet.pdf)

@@ -0,0 +1,38 @@+{+  "slug": "opa1678",+  "version": "0.1.0",+  "type": "component",+  "description": "TI dual audio op-amp, SOIC-8. Low noise, low distortion, rail-to-rail output, 2.25-5.5 V. Datasheet-verified.",+  "tags": [+    "component",+    "amplifier",+    "op-amp",+    "audio",+    "low-distortion",+    "soic-8",+    "texas-instruments"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "opa1678.kicad_sym",+    "opa1678.kicad_mod",+    "opa1678.glb",+    "opa1678.step",+    "opa1678.lbr",+    "docs/hero.png",+    "docs/opa1678-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file