component
PAM8302
Public Made by Adomby adom
Diodes 2.5 W mono class-D audio amplifier, MSOP-8. Filterless, 2.0-5.5 V, shutdown pin. Datasheet-verified.
3D Model
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Symbol & Footprint
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Datasheet
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README
markdownPAM8302
Diodes Incorporated · Class-D audio amplifier · MSOP-8
Drives a small speaker directly from a single 2.0 to 5.5 V supply, delivering up to 2.5 W into a 4 ohm load at class-D efficiency near 90%. The filterless bridge-tied output connects straight to the speaker without an LC filter, saving parts, and a shutdown pin (SD) mutes the amplifier at near-zero current. Differential inputs and resistor-set gain suit it to phone, toy, and IoT audio. A cheap, standard mono speaker amp.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SD | input | Active-low shutdown input. Drive low (VSL ≤ 0.4 V) to place the amplifier in shutdown (ISHDN ≤ 1 µA); drive high (VSH ≥ 1.2 V) for normal operation. Recommended to delay assertion ~10 ms after VDD rises for best pop performance. |
| 2 | NC | unconnected | No internal connection. Leave floating or tie to ground per PCB layout preference. |
| 3 | IN+ | input | Non-inverting analog audio input to the differential input amplifier. AC-couple through an input capacitor (typ. 0.1 µF) forming a high-pass filter with the internal 10 kΩ input impedance (RI). Closed-loop differential gain is 20·log(150 kΩ / (10 kΩ + RIN_ext)), max ≈ 23.5 dB. |
| 4 | IN- | input | Inverting analog audio input to the differential input amplifier. AC-couple through an input capacitor (typ. 0.1 µF); internal RI = 10 kΩ, RF = 150 kΩ set the gain. Tie to ground through a coupling cap for single-ended input drive. |
| 5 | VO+ | output | Positive Class-D PWM speaker output (H-bridge side +). Drives one terminal of the bridge-tied-load speaker (4 Ω or 8 Ω typical). Delivers up to 2.5 W into 4 Ω at VDD = 5 V, THD+N = 10%. A ferrite bead + 220 pF RC filter to ground is recommended for EMI reduction on long speaker leads. |
| 6 | VDD | power_in | Positive supply input, 2.0 V to 5.5 V. Decouple locally with a low-ESR 1.0 µF ceramic close to the pin and a 10 µF bulk capacitor. UVLO trips at ≈ 2.1 V. |
| 7 | GND | power_in | Device ground return for supply, input bias, and output stages. Connect to a low-impedance ground plane. |
| 8 | VO- | output | Negative Class-D PWM speaker output (H-bridge side −). Drives the second terminal of the bridge-tied-load speaker. A ferrite bead + 220 pF RC filter to ground is recommended for EMI reduction on long speaker leads. |
Key specifications
| Parameter | Value |
|---|---|
| Type | Mono class-D audio amplifier |
| Output power | 2.5 W into 4 ohm (10% THD, 5 V) |
| Supply | 2.0-5.5 V |
| Efficiency | ~90% |
| Output | Filterless bridge-tied |
| Gain | Resistor-set (up to 24 dB) |
| Shutdown | SD pin |
| Package | MSOP-8 |
Ordering variants
Same part, different packaging or reel option.
PAM8302AADCR (MSOP-8)PAM8302AASCR (SO-8)
CAD (KiCad official)
- Symbol:
Amplifier_Audio:PAM8302AAD (KiCad official) - Footprint:
Package_SO:MSOP-8_3x3mm_P0.65mm - 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files:
pam8302-etched.step/pam8302-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);pam8302.step/pam8302.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (14 pp, sha256
fb2ab762c31b5fd4, 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).