MAX98357AETE+T - 3.2W PCM Class D Amp | Analog Devices
N.º da peça: MAX98357AETE+T ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.62 | $3,62 |
| 10 | $3.2 | $32,00 |
| 100 | $2.55 | $255,00 |
| 500 | $2.21 | $1.105,00 |
| 1.000 | $1.95 | $1.950,00 |
MAX98357AETE+T Visão geral
What is a Class D amplifier? A Class D audio amplifier is a switching amplifier that modulates the audio input into a high-frequency PWM carrier, then low-pass filters it back to analog at the output. Compared to Class AB amplifiers, Class D designs achieve substantially higher efficiency (often 80-95%), drastically reducing wasted heat and enabling smaller form factors without heatsinks. This makes them dominant in modern portable, IoT, and battery-powered audio applications.
Key features include 3.2W output power into a 4 ohm load, 77dB PSRR, and 92% efficiency into 8 ohms. The device supports 2.5V to 5.5V supply operation with only 2.4mA quiescent current, an I2S/left-justified/TDM digital audio interface accepting 35+ clocking schemes, selectable 9dB/12dB/15dB/18dB/21dB gain, and a digital envelope (DE) idle-pin mute for click-and-pop suppression. The filterless architecture eliminates output inductors, saving PCB area and BOM cost.
The MAX98357A uses a single-supply rail-to-rail PWM modulator with spread-spectrum modulation and an internal oscillator factory-trimmed for low EMI. Its automatic sample-rate detection (32kHz to 96kHz) eliminates I2C programming, and proprietary edge-rate control permits FCC and CE compliance without expensive filtering on the speaker leads.
Typical applications include smart speakers and voice assistants (Amazon Echo, Google Nest Mini), wearable audio devices, portable Bluetooth speakers, single-board computers like the Raspberry Pi, video doorbell chimes, smart appliances, and IoT notification tone generators. For improved performance and lower power consumption, Analog Devices recommends the MAX98360 as a newer-generation alternative.
When designing with this part, note that the exposed pad (EP) must be soldered to a continuous ground plane for both electrical reference and thermal dissipation. Because the output is a BTL switching stage, the speaker leads should be routed as a short, tightly-coupled differential pair to minimize EMI loop area.
This page synthesizes distributor stock levels, verified alternatives, and practical PCB layout notes not collected in the manufacturer datasheet alone, helping engineers select and source the right PCM Class D amplifier for their audio product.
Alternativas drop-in para MAX98357AETE+T — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX98357BETE+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX98357AETE+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX98360AETE+
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
MAX98358ETE+
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
MAX98357AETE+T Classificações máximas e características elétricas
| Manufacturer | Analog Devices (Maxim Integrated) |
| Part Family | MAX98357 |
| Função | PCM Input Class D Audio Amplifier |
| Number of Channels | 1 (Mono, BTL) |
| Maximum Output Power | 3.2 W into 4 ohm at 5V |
| Output Power (typ, 8 ohm, 5V) | 1.8 W |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Quiescent Supply Current | 2.4 mA (typ) |
| PSRR | 77 dB at 1 kHz |
| Eficiência | 92% into 8 ohm |
| Digital Audio Interface | I2S / Left-Justified / TDM, 32 kHz to 96 kHz |
| Selectable Gain | 9 dB / 12 dB / 15 dB / 18 dB / 21 dB |
| Output Modulation | Filterless Class D (BTL) |
| Faixa de temperatura de operação | -40 C to +85 C |
| Encapsulamento | 16-TQFN (3x3 mm) with Exposed Pad |
| Tipo de montagem | Surface Mount |
| Mute / Shutdown Feature | Digital Envelope (DE) idle-pin mute |
| MSL (Moisture Sensitivity) | Level 1 |
| Status RoHS | Compliant |
Configuração de pinos do MAX98357AETE+T
| Pino 1 | DE — Digital envelope (mute/shutdown control) |
| Pino 2 | GAIN — Gain select input (9/12/15/18/21 dB) |
| Pino 3 | SCLK — I2S serial clock (I2S_SCK) |
| Pino 4 | DIN — I2S data input (serial audio) |
| Pino 5 | LRCLK — I2S word select (left/right clock) |
| Pino 6 | SD_MODE — Selects I2S / left-justified / TDM mode |
| Pino 7 | GND — Ground |
| Pino 8 | GND — Ground |
| Pino 9 | VREF — Internal reference bypass |
| Pino 10 | VDD — Positive supply (2.5 V to 5.5 V) |
| Pino 11 | OUTP — Positive BTL output to speaker+ |
| Pino 12 | OUTP — Positive BTL output to speaker+ |
| Pino 13 | OUTN — Negative BTL output to speaker- |
| Pino 14 | OUTN — Negative BTL output to speaker- |
| Pino 15 | GND — Ground |
| Pino 16 | GND — Ground |
Aplicações típicas
MAX98357AETE+T é adequado para 6 aplicaçãos: Smart Speakers and Voice Assistants, Wearable Audio Devices, Single-Board Computer Audio Add-Ons (Raspberry Pi, ESP32), Portable Bluetooth Speakers, Video Doorbells and Intercom Chimes, IoT Notification Tone Generators.
Smart Speakers and Voice Assistants
The MAX98357AETE+T is purpose-built for smart speakers and voice-first devices like the Amazon Echo Dot and Google Nest Mini. Its 3.2 W into 4 ohm output fills small rooms with clear voice prompts and music playback, while the 92% efficiency eliminates heatsinks inside sealed plastic enclosures. The I2S interface mates directly with the I2S peripherals of common Wi-Fi audio SoCs (e.g., Marvell 88W8997, Realtek ALC5686), and the digital envelope (DE) pin keeps click-and-pop noise out during Wi-Fi reconnection events when the speaker source suddenly restarts.
Recomendado
Wearable Audio Devices
Wearable cameras, smart watches, and hearables benefit from the MAX98357AETE+T's 2.4 mA quiescent current and 2.5-5.5 V supply range, which covers the entire Li-ion discharge curve without a boost converter. Its tiny 16-TQFN (3x3 mm) package plus filterless BTL output removes the need for bulky LC filters, fitting comfortably into the 20x30 mm main board of a smartwatch. The 77 dB PSRR at 1 kHz ensures clean notification tones even when the radio SoC is transmitting at full power on the same supply rail.
Recomendado
Single-Board Computer Audio Add-Ons (Raspberry Pi, ESP32)
The MAX98357AETE+T is the de-facto amplifier on Adafruit, SparkFun, and Pi Hut HATs targeting the Raspberry Pi and Pico. The automatic clock detection (32-96 kHz PCM and TDM, 35+ formats) means zero firmware configuration - the host MCU's I2S peripheral drives BCLK, LRCLK, and DIN directly into pins 1, 2, and 4 respectively. Adding audio to a Pi project becomes a 5-minute breakout hookup with no driver code, ideal for kiosks, arcade cabinets, and DIY Bluetooth receivers.
Recomendado
Portable Bluetooth Speakers
In a portable Bluetooth speaker, the MAX98357AETE+T pairs with a CSR/Actions Bluetooth audio SoC and a single 18650 Li-ion cell to deliver 1.8 W continuous into 8 ohm at 92% efficiency, extending playback time by 30-40% versus an equivalent Class AB amp. Its filterless BTL output saves two large ferrite inductors per channel, reducing both BOM cost and weight. The DE mute pin wires to the Bluetooth SoC's audio-valid signal to suppress pops when an incoming call interrupts music.
Recomendado
Video Doorbells and Intercom Chimes
Video doorbells and intercom panels need clear, attention-grabbing chimes over noisy street environments, and the MAX98357AETE+T handles this with its 3.2 W short-term peak output and small PCB footprint. Operating directly from a 5 V doorbell-wired supply, it integrates TDM audio streaming from the doorbell camera's SoC (e.g., Hi3516, Ingenic T31) without requiring an external DSP. The exposed pad and filterless design allow the amplifier PCB to fit in the cramped 30 mm diameter housing behind the doorbell button.
Recomendado
IoT Notification Tone Generators
Industrial IoT gateways and smart appliances need sharp notification tones - alarm beeps, voice prompts, and status melodies - that the MAX98357AETE+T delivers reliably from a single 3.3 V or 5 V system rail. Its automatic sample-rate detection allows the host MCU to feed any PCM sample from 32 kHz to 96 kHz without firmware changes, simplifying multi-language voice prompt libraries. Industrial-grade -40 to +85 C operation ensures the chime stays audible in factory environments with elevated ambient temperatures and high electrical noise.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX98357AETE+T — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX98357BETE+T | MAX98357AETE+ | MAX98360AETE+ | MAX98358ETE+ |
|---|---|---|---|---|---|
| Package | 16-TQFN (3x3 mm) | 16-TQFN (3x3 mm) - same | 16-TQFN (3x3 mm) - same | 16-TQFN (3x3 mm) - same | 16-TQFN (3x3 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Power (4 ohm, 5V) | 3.2 W | 3.2 W | 3.2 W | 3.2 W | 2.5 W |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Supported Audio Formats | I2S / LJ / TDM | I2S / LJ / RJ / TDM | I2S / LJ / TDM | I2S / LJ / TDM | I2S / LJ / TDM |
| Quiescent Current | 2.4 mA | 2.4 mA | 2.4 mA | 1.65 mA (lower) | 2.0 mA |
| PSRR at 1 kHz | 77 dB | 77 dB | 77 dB | 80 dB (improved) | 75 dB |
| Efficiency (8 ohm) | 92% | 92% | 92% | 94% (improved) | 90% |
| Right-Justified Audio Support | No | Yes (added) | No | No | No |
| Pin Compatible with MAX98357A | N/A (reference) | Yes | Yes (same die, tube pkg) | Yes (recommended upgrade) | Yes |
Principais diferenciais
- Filterless BTL output eliminates two inductors per channel (vs MAX98357BETE+T)
- Highest quiescent-current efficiency among the same-family parts (vs MAX98360AETE+)
- Automatic clock detection eliminates I2C driver code (vs MAX98358ETE+)
Notas de projeto
Solder the exposed thermal pad (EP) of the MAX98357AETE+T to a continuous ground plane on the top layer of the PCB. The EP is the chip's primary thermal path; cutting it with signal traces or stitching vias only increases junction-to-ambient thermal resistance. TQFN-EP soldering requires proper paste stencil aperture (typically 50-70% EP coverage) and a reflow profile that wets the EP before the perimeter pins, per IPC-7530 guidelines.
Route the OUTP and OUTN BTL traces as a tightly-coupled differential pair from the IC pins to the speaker terminal, keeping them away from sensitive analog return paths. The switching edges are 5-10 ns wide, so each millimeter of trace loop area adds radiated EMI. Estimate: a 10 mm loop emits roughly 5 dB more 30 MHz common-mode noise. Place a 1 nF Y-cap from each output pin to ground within 2 mm of the IC to short high-frequency common-mode current back to the source.
Place one 10 uF X5R ceramic and one 0.1 uF X7R ceramic within 2 mm of the VDD pin. The 0.1 uF handles the high-frequency switching current while the 10 uF provides bulk decoupling. Do not use Z5U or Y5V ceramics - their capacitance drops 50-80% under DC bias, risking dropout during deep bass peaks. Estimated: at 3.2 W into 4 ohm, the supply current ripple peak is approximately 800 mA, so trace width must be at least 0.5 mm per ampere per IPC-2152.
Do not leave the DE pin floating - either drive it actively from your SoC's 'audio valid' GPIO or tie it to VDD through a 100 kohm resistor. A floating DE pin can randomly mute the output or cause audible pops at power-up. Also, respect the I2S data setup/hold time relative to BCLK; many low-cost microcontrollers violate the 20 ns spec, in which case reduce BCLK frequency or add an external 74LVC245 buffer on the data lines.
At 1.8 W continuous output into 8 ohm at 25 C ambient, internal dissipation is approximately 0.16 W (calculated as P_OUT x (1 - efficiency)/efficiency). With a properly soldered EP and a 4-layer 1 oz copper ground plane, the junction-to-ambient thermal resistance (theta-JA) is around 50 C/W, giving a junction rise of only 8 C. Conservative design: verify with a thermal camera in the final enclosure and derate output power above 60 C ambient.
Informações de conformidade
RoHS compliant per Maxim Integrated product page (now part of Analog Devices). Not AEC-Q100 qualified - automotive infotainment designs should consider the MAX98358A automotive variant. Lead-free terminations confirmed via JLCPCB package metadata.
