STPA008-4WX - 4x50W Class AB Audio Amplifier | STMicroelectronics
부품 번호: STPA008-4WX ✓ 활성STPA008-4WX 개요
An automotive audio power amplifier is a multi-channel integrated circuit that accepts low-level audio inputs and drives loudspeaker loads through differential, bridge-tied-load outputs. In the product hierarchy, the STPA008-4WX is an audio amplifier IC, a class AB amplifier, a BTL output stage, a MOSFET power amplifier, and an automotive power-management and signal-conditioning device. Its four-channel architecture reduces the number of separate output amplifiers required in a car-radio or infotainment system.
The principal device ratings are 4 x 50 W output power, a 6 V minimum operating supply, four independent Class AB channels, and a 25-Flexiwatt vertical package. Additional verified functions include standby and mute controls, an offset detector, and 3.3 V CMOS-compatible standby and mute pins. The Flexiwatt27 version adds clipping detection and a diagnostics output, but those functions are not listed for the Flexiwatt25 STPA008-4WX version.
Each channel uses a bridge-tied-load topology, allowing the amplifier to drive a loudspeaker differentially and deliver the stated 50 W output capability without a single-ended output connection. The manufacturer describes the device as a complementary quad audio amplifier with MOSFET output devices. The offset detector can support system monitoring, while the mute and standby inputs permit the host head unit to control audible output and low-power states independently of the audio source.
Typical applications include automotive head units, car-radio systems, automotive infotainment amplifiers, low-voltage start-stop audio systems, and multi-channel vehicle loudspeaker drives. Operation down to 6 V is particularly relevant where the battery can fall below a conventional 12 V nominal level during engine stop. The four-channel quad structure allows left and right front speakers and left and right rear speakers to be driven from one power-amplifier package.
Power-supply layout, speaker return paths, and input filtering are critical in this application. The manufacturer application circuit specifies input capacitors equal to one quarter of the capacitor connected to the AC-GND pin for optimum pop performance. RC networks must be placed on both mute and standby pins to smooth transitions and suppress audible transients, and the amplifier requires careful thermal design because it can dissipate substantial power in a compact package.
This product record combines manufacturer and distributor information with application-specific design guidance, verified pricing references, comparison parameters, and drop-in candidate analysis. It distinguishes the STPA008-4WX from the Flexiwatt27 version and identifies where additional technical data or a verified pin-to-pin cross-reference is still required before a substitution is approved.
드롭인 대체품: STPA008-4WX — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: STPA008-4WX (동일 폼 팩터 및 풋프린트) — 차이점: Mounting Type, Package.
STPA008-4
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
STPA008-4W
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
TDA7850
✅ 드롭인✓ 재고 있음
$5.5 / 개
데이터시트 보기 →STPA008-4WX 최대 정격 & 전기적 특성
| Product Type | 4-channel MOSFET audio power amplifier |
| 출력 구성 | 4 channels in bridge-tied-load configuration |
| Amplifier Class | Class AB |
| Rated Output Power | 4 x 50 W |
| Minimum Operating Supply Voltage | 6 V |
| Output Stage Technology | MOSFET |
| Number of Amplifier Channels | 4 channels |
| Standby Control Logic | 3.3 V CMOS-compatible |
| Mute Control Logic | 3.3 V CMOS-compatible |
| Offset Detection | Integrated |
| Clipping Detection | Not specified for the Flexiwatt25 version |
| Diagnostics Output | Not specified for the Flexiwatt25 version |
| 패키지 | 25-Flexiwatt vertical |
| 실장 유형 | Through-hole power package |
| Automotive Application | High-power car-radio and automotive infotainment systems |
| Input Capacitor Recommendation | One quarter of the capacitor connected to the AC-GND pin |
| Mute and Standby Transition Control | RC cells required at both pins |
STPA008-4WX 25-flexiwatt vertical 핀 구성 가이드
STPA008-4WX(25-flexiwatt vertical 패키지)의 핀 구성입니다. 이 아날로그 부품에는 입력, 출력, 전원 공급 핀이 있습니다. 오프셋 널, 보상, 인에이블 핀 구성은 제조사 데이터시트를 참조하십시오. 신호 컨디셔닝 및 증폭기 회로에 이상적입니다.
다음에 대한 상세 핀아웃 데이터 없음: STPA008-4WX.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
STPA008-4WX 적합 용도: 6 애플리케이션s: Automotive Head Unit Amplifier, Start-Stop Vehicle Radio, Automotive Infotainment Loudspeaker Drive, Low-Voltage Automotive Audio System, Automotive Speaker Bridge Drive, Vehicle Audio Mute and Standby Control.
Automotive Head Unit Amplifier
The STPA008-4WX fits an automotive head-unit power stage because it combines four independent 50 W Class AB BTL channels with 6 V minimum operating voltage. A head unit can use the four outputs for front-left, front-right, rear-left, and rear-right speakers while retaining a low-noise Class AB architecture. The 3.3 V CMOS-compatible mute and standby inputs are useful for direct control by a system processor. Because the amplifier can dissipate considerable power, the PCB must provide substantial copper, the Flexiwatt tab must be properly attached, and the loudspeaker return paths must follow the manufacturer layout to minimize ground-related noise and pop artifacts.
Start-Stop Vehicle Radio
The 6 V minimum supply rating makes the STPA008-4WX relevant to start-stop vehicle radio systems, where battery voltage can fall below a normal 12 V nominal level during an engine stop. Its MOSFET Class AB output stages provide a conventional linear audio path rather than requiring a switching topology at the speaker output. The family is also described as having excellent GSM noise immunity, which is important where radio-frequency interference can be coupled into sensitive audio circuitry. Implementation still requires verified maximum-voltage, quiescent-current, and thermal limits, plus careful separation of power, speaker-return, mute, standby, and input paths on the PCB.
Automotive Infotainment Loudspeaker Drive
For multi-zone infotainment, the STPA008-4WX provides four 50 W amplifier channels in one 25-Flexiwatt vertical power package. This allows one IC to drive multiple vehicle loudspeakers instead of using separate single-channel amplifiers, reducing board area and simplifying the audio architecture. Its offset detector can support system monitoring, while standby and mute controls allow the infotainment controller to place the amplifier into a controlled state. The key engineering trade-off is heat: Class AB operation can be efficient at moderate output but dissipates substantial power when the voltage difference across the output stage is large. Thermal analysis must use the final board, copper area, and maximum channel load.
Low-Voltage Automotive Audio System
The STPA008-4WX is suitable for low-voltage automotive audio systems because it remains operational down to 6 V and is specified as a high-power car-radio amplifier. The quad topology supports several loudspeaker channels while preserving the expected sound-quality characteristics of a Class AB amplifier. Integration with a vehicle electrical system is not automatic: input transients, battery variation, ground offsets, reverse-battery protection, and load wiring must be evaluated independently. The manufacturer's low-voltage start-stop rationale should be combined with the complete absolute maximum and recommended operating conditions before defining the final supply architecture or protection network.
Automotive Speaker Bridge Drive
The STPA008-4WX uses bridge-tied-load outputs for each of its four channels, allowing the full output swing to be applied differentially across a loudspeaker. This arrangement is appropriate for compact automotive speaker systems where one amplifier channel drives each front or rear speaker. The 50 W-per-channel rating provides useful output capability, but the achieved level remains dependent on supply voltage and speaker impedance. Layout should preserve the manufacturer-defined AC-GND behavior, use the recommended input capacitors, and minimize copper resistance in the speaker returns. The power tab and thermal interface must be designed according to the complete Flexiwatt25 mechanical drawing.
Vehicle Audio Mute and Standby Control
The STPA008-4WX can be integrated into a vehicle head-unit control scheme using its 3.3 V CMOS-compatible mute and standby inputs. These controls support orderly transition between active playback and low-power or muted states, provided the transitions are smoothed rather than switched abruptly. STMicroelectronics specifically requires RC cells at both pins to prevent audible transients. Designers should validate turn-on and turn-off timing at cold start, cranking transients, rapid accessory events, and mute toggling. The amplifier should remain powered as required by its control architecture, while speaker muting is performed by the specified logic interface rather than by disconnecting the loudspeaker wiring.
엔지니어링 참조 데이터: STPA008-4WX — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | STPA008-4 | STPA008-4W | TDA7850 |
|---|---|---|---|---|
| Package | 25-Flexiwatt (Vertical) | 25-Flexiwatt (Vertical) | 25-Flexiwatt (Vertical) | 25-Flexiwatt (Vertical) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
주요 차별점
- Six-volt start-stop operating capability (vs TDA7850)
- Four-channel 50 W class-AB architecture (vs STPA008-4W)
- Integrated offset monitoring and CMOS-compatible controls (vs TDA7850)
설계 노트
Follow the STPA008 application-circuit layout for the power, speaker-return, AC-GND, input, mute, and standby paths. Place the input capacitors close to the amplifier and use each input capacitor at one quarter of the capacitor connected to the corresponding AC-GND pin for the manufacturer's stated optimum pop performance. Keep high-current loudspeaker returns away from sensitive input references and verify the exposed tab connection and thermal-copper geometry against the official Flexiwatt25 mechanical drawing.
Do not allow abrupt mute or standby transitions. STMicroelectronics requires RC cells at both the mute and standby pins to smooth control transitions and prevent audible transients. Validate the RC time constants with the complete head-unit control sequence, including ignition changes, media-player start events, and repeated mute toggles. Avoid implementing mute by disconnecting the speaker wiring, and confirm that the host logic levels are compatible with the device's 3.3 V CMOS-compatible inputs.
Estimate worst-case dissipation using the actual channel load, supply voltage, output waveform, and board thermal resistance before production. Class AB output stages can dissipate significant power when several channels operate simultaneously, and the 25-Flexiwatt package requires the tab and PCB copper to form part of the heat path. Apply manufacturer thermal-limit procedures and consider transient automotive events such as cranking and start-stop operation; do not infer a maximum output level solely from the 4 x 50 W headline rating.
규정 준수 정보
The supplied sources identify an automotive infotainment and car-radio application but do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.
