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TPA321D
Public Made by Adomby adom
Texas Instruments Audio Amplifiers, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownTPA321D
Texas Instruments · Audio Amplifiers · SOIC-8
TPA321D from Texas Instruments, 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 | SHUTDOWN | input | SHUTDOWN places the entire device in shutdown mode when held high (IDD about 0.15 µA), with VIH of at least 0.9 VDD and VIL of at most 0.1 VDD. |
| 2 | BYPASS | passive | BYPASS is the tap to the voltage divider for internal mid-supply bias and should be connected to a 0.1-µF to 1-µF capacitor when used as an audio amplifier. |
| 3 | IN+ | input | IN+ is the noninverting input and is typically tied to the BYPASS terminal for single-ended (SE) operation. |
| 4 | IN- | input | IN- is the inverting input and is typically used as the audio input terminal. |
| 5 | VO+ | output | VO+ is the positive bridge-tied load (BTL) audio output. |
| 6 | VDD | power_in | VDD is the supply voltage terminal, specified from 2.5 V to 5.5 V with absolute maximum 6 V. |
| 7 | GND | power_in | GND is the ground connection. |
| 8 | VO- | output | VO- is the negative bridge-tied load (BTL) audio output. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
TPA321D - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
tpa321d-etched.step/tpa321d-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tpa321d.step/tpa321d.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (33 pp, sha256
66e3086d33d8de30, retrieved 2026-10-10, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).