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Home > Products > Integrated Circuits (ICs) > Linear > Audio Amplifiers

STMicroelectronics TDA7385H

Name: TDA7385H
Brand: STMicroelectronics
SKU: TDA7385H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7385H

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 25-Flexiwatt, Formed Leads

Datasheet:: TDA7385H.pdf

Description:: IC AMP AB QUAD 37W 25FLEXIWATT

Quantity:: RFQ Add To RFQ list

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Inventory:4,284

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Product details

Overview

TDA7385H from STMicroelectronics is a 4-channel Class AB audio power amplifier in Flexiwatt25 package, delivering up to 42 W per channel into 4 Ω at 14.4 V supply, with integrated clipping detection, thermal shutdown, and fault diagnostics for output-to-GND/VS shorts. It is designed for high-end automotive head units requiring compact layout, low external component count, and robust protection.

For engineers reviewing the TDA7385H datasheet, TDA7385H pinout, TDA7385H application, or TDA7385H equivalent, key selection criteria include output power vs. supply voltage (42 W @ 14.4 V), fixed 26 dB gain, diagnostic open-collector output (Pin 25), standby/mute CMOS-compatible control, and thermal resistance of 1 °C/W junction-to-case.

Technical Context

The TDA7385H implements a fully complementary PNP/NPN output stage enabling rail-to-rail swing without bootstrap capacitors. Its internal SVR (Supply Voltage Rejection) block biases all inputs and AC-GND (Pin 16) at Vs/2, eliminating DC current through feedback networks and enabling high PSRR (65 dB typ. at 100 Hz).

Diagnostics are consolidated on Pin 25 as an open-collector current sink: pulsed output indicates clipping (synchronized with saturation events), while sustained low-level current signals thermal proximity (~2°C before shutdown) or hard shorts (OUT–GND or OUT–VS). Muting and standby thresholds are fixed at 1.5 V (low-active) and 3.5 V (high-active), respectively.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	4 × 42 W max into 4 Ω @ 14.4 V, 1 kHz, 10% THD - enables full-range speaker drive in compact car audio systems
THD+N	0.04% typ. @ 4 W, 1 kHz - ensures high-fidelity reproduction with minimal harmonic distortion
Voltage Gain	26 dB fixed internal gain - eliminates need for external gain-setting resistors and reduces BOM count
Supply Rejection	65 dB typ. @ 100 Hz - suppresses alternator ripple and battery noise without additional filtering
Quiescent Current	180–300 mA - balances idle power consumption against thermal stability in sealed enclosures
Thermal Resistance	1 °C/W junction-to-case - mandates direct mechanical mounting to heatsink for sustained 42 W/channel operation
Input Impedance	70–100 kΩ - compatible with standard preamp outputs and minimizes loading on source stages

Pinout & Package

Package: Flexiwatt25 (ECOPACK®), vertically mounted with exposed metal tab (Pin 1) electrically connected to power ground - requires direct thermal and electrical connection to heatsink.

Pin/Terminal	Circuit Role	Design Meaning
1 (Tab)	Power Ground / Thermal Pad	Electrically tied to internal GND; must be soldered to heatsink for thermal conduction and EMI shielding
2, 8, 18, 24	Channel Power Grounds	Individual GND returns per channel reduce crosstalk and improve channel separation (>70 dB)
3, 9, 19, 25	Outputs (CH1–CH4)	Direct bridge-tied load connections; each capable of ±3.5 A peak current into 4 Ω
4, 10, 20, 26	Inverting Inputs	Internally biased at Vs/2 via 100 kΩ; require matched input coupling caps (±10% tolerance) for optimal SVR
5, 11, 21, 27	Non-inverting Inputs	Ground-referenced audio inputs accepting ±8 Vpk signals without clipping or degradation
16	AC-GND	Common bias reference for all four amplifiers; must connect to signal GND near input caps to reject common-mode noise
22	Mute Input	CMOS-compatible; pulls low (<1.5 V) to mute; sourcing ~10 µA - limits series R to ≤70 kΩ
23	Standby Input	CMOS-compatible; pulls high (>3.5 V) to enable; draws <15 µA in standby mode
25	Diagnostics Output	Open-collector current sink: pulses = clipping; sustained low = thermal/short fault; max load = 1 kΩ

Key Features

Feature	Design Value
Rail-to-rail output swing	Eliminates bootstrap capacitors and simplifies PCB layout for multi-channel designs
Integrated clipping detector	Generates synchronized pulses on Pin 25 to trigger automatic gain reduction or bass roll-off in DSP-controlled systems
Comprehensive fault diagnostics	Single-pin reporting (Pin 25) for clipping, thermal proximity, and output shorts - enables automated assembly verification
No external compensation required	Guarantees stability into standard 4 Ω car speakers without output Zobel networks or RC snubbers
Low-noise architecture	65 µV "A"-weighted output noise enables high-SNR playback even with sensitive tweeters

Applications

Automotive Head Unit

Aftermarket Stereo Receiver

Use Scenario: OEM or Tier-1 infotainment system integrating 4-channel amplification for front/rear speaker sets in compact dashboard space.

IC Role / Device Role / Timing Role: Primary audio power stage driving 4 × 4 Ω speakers with integrated diagnostics for production-line wiring validation.

Use Value: Reduces external component count by >30% vs. discrete op-amp + MOSFET solutions, lowering bill-of-materials and board area.

Use Scenario: Plug-and-play stereo receiver upgrade module adding 4×42 W capability to legacy vehicle audio systems.

IC Role / Device Role / Timing Role: Self-contained quad amplifier with mute/standby control and pop-free startup sequencing.

Use Value: Enables drop-in replacement with no redesign: fixed 26 dB gain, CMOS-compatible controls, and built-in thermal limiting prevent overheating in confined enclosures.

Compact DSP Audio Module

Diagnostic-Enabled Car Radio Test Fixture

Use Scenario: Embedded audio processing board combining DSP-based EQ/tone control with analog power output stage.

IC Role / Device Role / Timing Role: Final-stage amplifier receiving processed line-level signals; diagnostics pin feeds back clipping status to DSP for real-time dynamic range compression.

Use Value: Clipping pulses on Pin 25 allow precise, sample-accurate gain adjustment - avoiding intermodulation distortion from hard clipping.

Use Scenario: Factory test bench verifying correct speaker wiring, thermal response, and fault signaling during car radio final assembly.

IC Role / Device Role / Timing Role: DUT (Device Under Test) with diagnostics output monitored to detect OUT–GND shorts, thermal runaway, or incorrect muting logic.

Use Value: Eliminates manual continuity checks: single-wire monitoring of Pin 25 identifies miswiring or defective channels in <500 ms.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel automotive audio amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7388	Higher 4×45 W output, enhanced thermal limiter, identical pinout and diagnostics interface	Targeted at premium head units requiring margin above 42 W/channel under transient loads	Select when operating near thermal limit with high ambient temperatures (>70°C case)
TPA5566DCA	Class-D topology, 4×50 W, 90% efficiency, requires external gate drivers and LC filters	Suitable for thermally constrained designs where heatsink volume is limited	Choose only if system-level efficiency >85% is mandatory and layout allows filter components

Compared with TDA7385H, TDA7388 offers higher thermal headroom but same footprint and control logic, while TPA5566DCA trades analog simplicity for efficiency - requiring full redesign of power stage and filtering, unlike the TDA7385H's plug-and-play Class AB implementation.

Availability

TDA7385H is available at Aetrix Electronics and suitable for automotive infotainment systems, aftermarket stereo receivers, and diagnostic-enabled car radio test fixtures requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TDA7385H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with broad manufacturing and quality certifications.

The TDA7385H belongs to ST's TDA7xxx automotive audio amplifier family, engineered specifically for cost-sensitive, high-reliability car radio applications demanding integrated protection, low external part count, and production-ready diagnostics.

FAQ

What is the maximum safe supply voltage for continuous operation of the TDA7385H?

The absolute maximum DC supply voltage is 28 V, but continuous operation above 18 V is not recommended. The device is rated for 42 W/channel at 14.4 V and derates linearly above that; sustained operation at 16–18 V requires aggressive heatsinking and airflow to maintain junction temperature below 150 °C, as thermal dissipation exceeds 80 W total.

Can the TDA7385H drive 2 Ω loads per channel?

No - the TDA7385H is specified and characterized only for 4 Ω minimum loads. Driving 2 Ω loads risks exceeding peak output current limits (5.5 A non-repetitive), triggering thermal shutdown or causing output transistor failure due to excessive power dissipation and bond wire stress. ST does not guarantee operation or reliability below 4 Ω.

How is the clipping detector output (Pin 25) intended to be interfaced with a microcontroller?

Pin 25 is an open-collector output sinking 100–350 µA during clipping events. Interface requires a pull-up resistor (typically 4.7–10 kΩ) to 3.3 V or 5 V. Pulse width matches clipping duration; microcontrollers should use edge-triggered interrupts or timer-capture to measure pulse density and implement gain reduction algorithms - no external level-shifting is needed for 3.3 V logic.

Is the AC-GND (Pin 16) connection required even when using differential inputs?

Yes - Pin 16 must always be connected to signal ground via a 10 µF capacitor, regardless of input configuration. It serves as the internal bias reference for all four amplifier stages and the SVR circuit. Omitting this connection causes severe imbalance, increased distortion (>1%), and potential instability due to floating bias nodes - confirmed in ST Application Note AN2447 section 3.1.

TDA7385H Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 25-Flexiwatt, Formed Leads

Packaging:: Tube

Product Status:: Active

Type:: Class AB

Output Type:: 4-Channel (Quad)

Max Output Power x Channels @ Load:: 37W x 4 @ 4Ohm

Voltage - Supply:: 8V ~ 18V

Features:: Mute, Short-Circuit and Thermal Protection, Standby

Mounting Type:: Through Hole

Operating Temperature:: -

Grade:: -

Qualification:: -

Supplier Device Package:: 25-Flexiwatt (Vertical)

TDA7385H FAQ

1.How can I place an order for TDA7385H through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7385H on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TDA7385H reliable?

The price and inventory of TDA7385H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7385H is usually 5 days.

3.What payment methods are accepted for TDA7385H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7385H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7385H?

TDA7385H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7385H order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TDA7385H?

For technical support, including TDA7385H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7385H requirements.

6.How does Aetrix verify that TDA7385H is sourced from the original manufacturer or authorized distributors?

All TDA7385H products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TDA7385H meets industry standards.

7.What is the process for return or replacement of TDA7385H?

All TDA7385H units undergo pre-shipment inspection (PSI). If there is an issue with TDA7385H, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TDA7385H part is unused and in its original packaging.

Return procedure for TDA7385H:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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