PAM8302

@@ -0,0 +1,52 @@+# PAM8302++**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++- `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)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Diodes Incorporated datasheet](https://www.diodes.com/assets/Datasheets/PAM8302A.pdf) (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).++[Datasheet PDF](docs/pam8302-datasheet.pdf)

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