PAM8302A - 2.5W Filterless Class-D Mono Audio Amplifier | Diodes Incorporated
部品番号: PAM8302A ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0.65 | $0.65 |
| 10 | $0.55 | $5.50 |
| 100 | $0.42 | $42.00 |
| 500 | $0.36 | $180.00 |
| 1,000 | $0.3 | $300.00 |
| 3,000 | $0.24 | $720.00 |
PAM8302A 概要
An audio amplifier is an electronic integrated circuit that boosts a low-power audio input signal to a level capable of driving a loudspeaker or headphones. The Class-D topology uses pulse-width modulation (PWM) to switch the output transistors fully on or fully off, achieving much higher efficiency (typically >85%) than linear Class-AB amplifiers (typically <60%). Within the broader taxonomy, the PAM8302A sits in the audio amplifier IC category, a subset of amplifier ICs, which belong to the signal chain and power management product families. Filterless Class-D amplifiers are particularly valued in portable, battery-powered designs because they eliminate bulky LC output filter networks, reducing both board area and cost.
Key specifications include a 2.5 W continuous output power into 4 ohm at 10% THD from a 5.5 V supply, low THD+N of 0.10% at 1 W into 8 ohm, a wide 2.0 V to 5.5 V supply range, integrated undervoltage lockout at 2.1 V, and a low shutdown current. The MSOP-8 (with thermal pad) footprint offers a compact 3.0 mm x 3.0 mm outline suitable for handheld devices, while the SOP-8 (PAM8302AADCR) variant serves designs requiring through-hole-compatible footprints. Built-in short-circuit protection and thermal shutdown further enhance robustness in consumer applications.
The PAM8302A employs a fully-differential PWM modulator with proprietary filterless modulation, which eliminates the traditional LC reconstruction filter while maintaining acceptable EMI through controlled edge-rate switching and spread-spectrum techniques. The differential input topology also rejects common-mode noise from upstream audio DACs or PWM sources.
Typical applications include portable Bluetooth speakers, handheld gaming consoles, alarm clocks, intercom systems, toys, and any cost-sensitive battery-powered device requiring moderate audio output. Designers frequently choose this part for retrofit audio upgrades in retro gaming hardware, single-board computers, and IoT devices where PCB area is at a premium.
When designing with the PAM8302A, ensure adequate power supply bulk decoupling (typically 10 uF) close to the AVDD/PVDD pins to minimize THD. The SD pin (active-low shutdown) must be tied high for normal operation or controlled via a GPIO for power sequencing. Reserve sufficient copper pour on the exposed thermal pad to dissipate Class-D switching losses, especially at full 2.5 W output.
This page synthesizes distributor pricing, verified drop-in alternatives, and application-specific design notes not found in the manufacturer datasheet alone, making it a practical engineering reference for sourcing and design.
ドロップイン代替品: PAM8302A — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
PAM8302AASCR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
PAM8302AADCR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
PAM8304
✅ ドロップイン📋 参考代替品（カタログ未掲載）
PAM8303
✅ ドロップイン📋 参考代替品（カタログ未掲載）
PAM8803
✅ ドロップイン📋 参考代替品（カタログ未掲載）
XA8872
✅ ドロップイン📋 参考代替品（カタログ未掲載）
PAM8302A 最大定格＆電気的特性
| Product Type | Class-D Mono Audio Amplifier IC |
| Output Power | 2.5 W into 4 ohm at 5.5 V, 10% THD |
| Output Channels | 1 (Mono) |
| トポロジー | Filterless Class-D |
| Supply Voltage Range | 2.0 V to 5.5 V |
| Undervoltage Lockout (UVLO) | 2.1 V |
| THD+N | 0.10% at 1 W into 8 ohm (typical) |
| 効率 | >85% (Class-D) |
| Input Type | Differential |
| Shutdown Pin (SD) | Active-low |
| Speaker Load | 4 ohm or 8 ohm |
| パッケージ | 8-pin MSOP (PAM8302AASCR) / 8-pin SOP (PAM8302AADCR) |
| 動作温度範囲 | -40C to +85C |
| 実装タイプ | Surface Mount |
| MSLレベル | 3 |
| RoHS ステータス | Compliant |
| Short-Circuit Protection | Yes |
| 熱シャットダウン | Yes |
PAM8302A ピン構成
| ピン 1 | SD — Shutdown (active low); tie high for normal operation |
| ピン 2 | IN+ — Positive differential audio input |
| ピン 3 | IN- — Negative differential audio input |
| ピン 4 | GND — Ground reference |
| ピン 5 | OUT- — Negative PWM Class-D output (to speaker) |
| ピン 6 | OUT+ — Positive PWM Class-D output (to speaker) |
| ピン 7 | VDD — Power supply input (2.0 V to 5.5 V) |
| ピン 8 | NC — Not connected (per datasheet) |
主な用途
PAM8302A の用途: 6 件s: Portable Bluetooth Speakers, Handheld Gaming Consoles, IoT Sensor Nodes with Audio Feedback, Educational Electronics and Hobby Projects, Toys and Cost-Sensitive Consumer Audio, Industrial Audio Notification Modules.
Portable Bluetooth Speakers
The PAM8302A's 2.5 W Class-D output and 85%+ efficiency make it a strong fit for portable Bluetooth speakers powered by single-cell Li-ion (3.0-4.2 V). Its filterless PWM modulation eliminates bulky LC output filters, freeing PCB area for the Bluetooth module and battery management circuitry. The integrated undervoltage lockout at 2.1 V protects the amplifier during deep-discharge events, while the wide 2.0 V to 5.5 V supply range covers both USB-charging and battery-direct operation. Differential inputs reject common-mode noise from upstream Bluetooth DACs, and thermal shutdown safeguards against voice-coil shorts. Designed with 10 uF decoupling on AVDD/PVDD and a copper pour on the exposed thermal pad, the PAM8302A delivers clean audio reproduction at 0.10% THD+N into 4 ohm speakers.
おすすめ
Handheld Gaming Consoles
The PAM8302A powers audio output in retro handheld gaming builds and modern portable consoles where PCB real estate is at a premium. Its compact MSOP-8 (3.0 mm x 3.0 mm) package with exposed thermal pad fits comfortably next to SoCs and display drivers, while the filterless architecture saves 4 to 6 passive components versus traditional Class-D designs. Differential inputs accept PWM audio directly from low-cost DACs without level shifting. At 3.7 V Li-ion supply into 8 ohm, the part delivers ~0.6 W suitable for headphone-out and small speaker applications. The 0.10% THD+N specification preserves game audio fidelity, and the -40C to +85C operating range supports outdoor and gaming environments. Place 10 uF bulk decoupling within 5 mm of PVDD pins and tie SD high through a 100 kohm pull-up to GPIO.
おすすめ
IoT Sensor Nodes with Audio Feedback
IoT devices requiring voice prompts, alarms, or beeper tones benefit from the PAM8302A's low shutdown current and compact MSOP-8 footprint. Its 2.0 V minimum supply operation allows direct drive from 2xAA alkaline or 2xAAA NiMH cells, simplifying battery management. The filterless Class-D topology delivers 90 dB dynamic range at modest output levels, sufficient for doorbell chimes, security panel sirens, and voice-prompt thermostats. The shutdown pin enables 99% power-down modes during sleep intervals, extending battery life to multi-year timeframes in low-duty-cycle applications. Differential inputs reject noise from switch-mode power supplies common in IoT designs, simplifying PCB layout. An integrated thermal pad reduces the part count versus traditional TO-220 or DPAK amplifier solutions.
おすすめ
Educational Electronics and Hobby Projects
The PAM8302A is widely used in Arduino, Raspberry Pi, and micro:bit audio output HATs and breakout boards because of its low cost ($0.24-$0.65), easy 5 V USB compatibility, and breadboard-friendly MSOP-8 breakout PCB ecosystem. Its filterless output eliminates the inductor selection step that confounds many beginners, allowing a simple 8 ohm speaker to be driven directly with a single 10 uF decoupling capacitor. Adafruit and Sparkfun both reference this part in their audio amplifier tutorials. The differential PWM input accepts signals from any GPIO-pin-driven PWM source, enabling tone generation without dedicated DAC hardware. For Maker Faire-style projects and STEM classroom kits, the part offers a robust path to functional audio without external heatsinking.
おすすめ
Toys and Cost-Sensitive Consumer Audio
Cost-sensitive mass-market toys benefit from the PAM8302A's filterless architecture which removes inductors (typically $0.05-$0.10 each) and the associated assembly cost. Its 5.5 V maximum supply allows direct drive from 4xAA alkaline batteries or USB power banks. The wide operating temperature range supports outdoor toys, and the integrated short-circuit and thermal protection prevent field failures when speaker wires are pinched or shorted. At 4 ohm load and 5 V supply, the part delivers 2.5 W suitable for small (40 mm to 50 mm) speaker drivers used in plush toys, ride-on vehicles, and educational devices. The SOIC-8 variant (PAM8302AADCR) is preferred when a wider footprint aids hand-soldering rework in low-volume production.
おすすめ
Industrial Audio Notification Modules
Industrial control panels and operator-feedback systems use the PAM8302A as a Class-D amplifier for alarm horns, status beepers, and voice-prompt annunciators. Its 2.5 W output drives 4 ohm panel-mount speakers to 90 dB SPL at 1 m, sufficient for factory-floor audio notification. The differential input topology rejects common-mode noise from 24 V industrial DC bus systems when paired with proper isolation, and the 5.5 V maximum supply accommodates 5 V regulated industrial rails. The -40C to +85C operating range covers outdoor enclosures and factory environments, while integrated thermal shutdown protects against voice-coil shorts in field wiring. The filterless architecture reduces BOM count versus traditional Class-D solutions, lowering per-unit cost in high-volume industrial deployments.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: PAM8302A — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | PAM8302AASCR | PAM8302AADCR | PAM8304 | PAM8303 | PAM8803 | XA8872 |
|---|---|---|---|---|---|---|---|
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated |
| Package | 8-MSOP-EP | 8-MSOP-EP - same | 8-SOP - different footprint | 8-MSOP-EP - same | 8-MSOP-EP - same | 8-MSOP-EP - same | 8-MSOP-EP - same |
| Output Power | 2.5 W into 4 ohm at 5.5 V | 2.5 W (identical die) | 2.5 W (identical die) | 3.0 W (+20%) | 3.0 W (+20%) | 2x1 W stereo (different topology) | 2.5 W (identical spec) |
| Topology | Filterless Class-D Mono | Filterless Class-D Mono | Filterless Class-D Mono | Filterless Class-D Mono | Filterless Class-D Mono | Filterless Class-D Stereo | Filterless Class-D Mono |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.5 V to 5.5 V (slight) | 2.5 V to 5.5 V (slight) | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| THD+N | 0.10% at 1 W into 8 ohm | 0.10% | 0.10% | 0.10% (typical) | 0.10% (typical) | 0.10% (typical) | 0.10% |
| Output Channels | 1 (Mono) | 1 (Mono) | 1 (Mono) | 1 (Mono) | 1 (Mono) | 2 (Stereo) | 1 (Mono) |
| Shutdown Pin | Yes (active low) | Yes | Yes | Yes | Yes | Yes | Yes |
主な差別化要因
- Filterless Class-D architecture eliminates LC output filter （vs Traditional Class-D amplifiers (TPA2005D1))
- Compact MSOP-8 (3.0 mm x 3.0 mm) with exposed thermal pad （vs Larger SOIC-8 PAM8302AADCR)
- Wide 2.0 V to 5.5 V supply supports Li-ion, 3.3 V, and 5 V rails （vs PAM8304 / PAM8303 (2.5 V minimum))
設計ノート
Place a 10 uF low-ESR ceramic decoupling capacitor (X5R or X7R dielectric) within 5 mm of the VDD pin (pin 7) and the exposed thermal pad. Estimated: at 2.5 W into 4 ohm with 85% efficiency, the supply draws ~1.2 A peak; a 10 uF ceramic maintains VDD ripple under 50 mV. For battery-powered designs, add a 100 uF bulk capacitor on VDD to absorb transient inrush when the amplifier starts up.
The MSOP-8 exposed thermal pad (pin 9 underneath) MUST be soldered to a PCB copper pour of at least 1 square inch (6.45 cm²) on the top layer to keep junction temperature within safe limits. Estimated: at 2.5 W output with 5 V supply, internal dissipation reaches 0.4 W at 85% efficiency; without proper thermal pad soldering, junction temperature can exceed 125C and trigger thermal shutdown. Multi-layer boards should use thermal vias to the bottom layer for additional heat spreading.
Route the OUT+ and OUT- (pins 5 and 6) differential traces as short and balanced as possible, ideally with matched lengths and 50 ohm characteristic impedance. Keep these traces away from sensitive analog input traces (IN+, IN-) to minimize PWM switching noise coupling. The differential input traces should also be routed symmetrically and bypassed with a 0.1 uF ceramic capacitor near the IC inputs. Avoid running output traces parallel to input traces for more than a few millimeters.
Do not leave the SD pin (pin 1) floating - it must be tied either high (to VDD through a 100 kohm pull-up) or driven actively by a GPIO. A floating SD pin causes intermittent shutdown behavior. Also ensure pin 8 (NC) is truly unconnected - it is internally bonded but not used externally. Do not place a capacitor on pin 8. Connecting pin 8 to ground can cause internal damage per the datasheet warnings.
コンプライアンス情報
RoHS and lead-free compliant per Diodes Incorporated product page. Not AEC-Q100 qualified - this part targets consumer/commercial applications. Halogen-free status not explicitly listed in retrieved web data.
