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

STMicroelectronics TDA7387

Name: TDA7387
Brand: STMicroelectronics
SKU: TDA7387
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7387

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 25-Flexiwatt, Formed Leads

Datasheet:: TDA7387.pdf

Description:: IC AMP AB QUAD 41W 25FLEXIWATT

Quantity:: RFQ Add To RFQ list

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Inventory:707

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Product details

Overview

TDA7387 from STMicroelectronics is a quad-channel Class AB audio power amplifier in Flexiwatt25 package, delivering up to 4 × 41 W into 4 Ω loads at 14.4 V supply. It integrates standby/mute functions, internal 26 dB fixed gain, and protection against output short circuits, thermal overload, load dump, reversed battery, and ESD-designed for high-end automotive head units.

For engineers reviewing the TDA7387 datasheet, TDA7387 pinout, TDA7387 application, or TDA7387 equivalent, key selection criteria include rail-to-rail output swing without bootstrap capacitors, automute at minimum supply voltage detection, low 50–65 µV A-weighted output noise, and compatibility with standard car-radio speaker loads requiring minimal external components.

Technical Context

The TDA7387 employs a fully complementary PNP/NPN output stage enabling rail-to-rail voltage swing and eliminating need for bootstrap capacitors. Its AC-GND (Pin 16) serves as common bias reference for all four channels, internally set to VS/2 via a dedicated Supply Voltage Rejection (SVR) block.

Standby and mute inputs are CMOS-compatible with defined threshold voltages (VSB_IN ≤ 1.5 V for OFF; VM_IN ≤ 1.5 V for mute), and both feature ~10 µA sourcing current. Thermal protection uses a soft limiter with junction temperature limit of 150 °C and Rth(j-case) = 1.0 °C/W (TDA7387) or 1.3 °C/W (EP/EPAG variants).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	4 × 41 W max into 4 Ω @ VS = 14.4 V, THD = 10% - enables full-range audio drive for four speakers in compact car radio designs.
THD+N	0.04% typ @ Po = 4 W - ensures high-fidelity reproduction with minimal harmonic distortion at typical listening levels.
Supply Voltage Range	VS = 14.4 V (operational), 28 V DC max, 50 V peak (50 ms) - supports wide automotive battery transients including load dump.
Input Impedance	70–100 kΩ - compatible with standard line-level preamp outputs without loading effects.
Quiescent Current	180–300 mA @ VS = 14.4 V - balances idle power consumption and thermal stability in sealed head unit enclosures.
SVR	50–65 dB @ f = 100 Hz - suppresses battery ripple and alternator noise before amplification, critical for clean audio in vehicle environments.
Cross Talk	50–70 dB @ f = 1 kHz - maintains channel separation essential for stereo imaging and multi-zone audio routing.

Pinout & Package

Package: Flexiwatt25 (vertical exposed pad variant available as TDA7387EP/EPAG), thermally optimized for PCB-mounted heatsinking with tab (Pin 1) connected to clean power ground.

Pin/Terminal	Circuit Role	Design Meaning
1 (Tab)	Thermal Pad / Power Ground	Mechanically tied to heatsink; must connect to cleanest power ground point near supply filtering caps for optimal thermal and noise performance.
2, 8, 18, 24	Power Ground (per channel)	Dedicated GND pins per amplifier pair reduce inter-channel coupling and improve crosstalk & distortion.
3, 9, 19, 25	Inverting Input	AC-GND referenced; requires matched input coupling caps (±10% tolerance) for balanced SVR and pop-free operation.
4, 10, 20, 26	Non-inverting Input	Ground-compatible; accepts ±8 Vpk signals without degradation - simplifies interface with differential or single-ended sources.
5, 11, 21, 27	Output	Rail-to-rail Class AB output; no bootstrap needed - reduces BOM count and PCB area vs. traditional bridge-tied load designs.
12, 13	V_S (Supply)	Two independent supply pins feed two amplifier pairs - improves PSRR and limits current path inductance.
14	AC-GND	Common bias node for all inverting inputs; must tie C5 capacitor directly to signal ground near audio inputs for best CMRR.
15	SVR Capacitor	Connects to signal ground; ≥10 µF value controls turn-on/off timing and optimizes pop suppression during state transitions.
16	Mute Control	CMOS-compatible input; <1.5 V mutes output (≥80 dB attenuation); sourcing ~10 µA - limits series R to ≤70 kΩ.
22	Standby Control	CMOS-compatible input; <1.5 V places amp in standby (<15 µA I_SB); sourcing ~10 µA - same R/C design rules apply.
23	Bootstrap Disable	Internally tied; confirms no external bootstrap required - eliminates associated component cost and layout complexity.

Key Features

Feature	Design Value
Rail-to-rail output swing	Eliminates need for external bootstrap capacitors - reduces component count by ≥2 per channel and simplifies layout.
Automute at min. supply detection	Disables output when VS drops below safe operating threshold - prevents audible click/pop and protects speakers during ignition cycles.
Integrated AC-GND reference	Single shared bias node (Pin 14) for all four inverting inputs - ensures matched DC operating points and minimizes channel imbalance.
Soft thermal limiter	Gradual power reduction above T_j = 150 °C - avoids abrupt shutdown and maintains audio continuity during sustained high-power operation.
No external compensation required	Stable into standard 4 Ω car speakers without output R-C networks - cuts BOM cost and improves reliability over competing solutions.

Applications

Automotive Head Unit

Aftermarket Stereo Receiver

Use Scenario: Integrated 4-channel amplifier in OEM or Tier-1 head unit with digital signal processor and USB/AUX inputs.

IC Role / Device Role / Timing Role: Final-stage audio power driver delivering full-bandwidth analog output to front/rear speakers.

Use Value: 41 W/channel into 4 Ω enables loud, distortion-free playback even with inefficient coaxial speakers commonly used in compact dash installations.

Use Scenario: Plug-and-play replacement amplifier module for legacy car radios lacking built-in power stages.

IC Role / Device Role / Timing Role: Standalone quad amplifier accepting line-level inputs and driving passive speakers without external regulators or filters.

Use Value: Fixed 26 dB gain and internal biasing eliminate need for external gain-setting resistors or DC-blocking networks - accelerates integration.

Multi-Zone Audio Distribution

Compact Infotainment System

Use Scenario: Zone-controlled audio system in premium vehicles where front, rear, and subwoofer zones require independent level control.

IC Role / Device Role / Timing Role: Channel-isolated power stage supporting independent mute/standby per zone via discrete logic control lines.

Use Value: Dedicated power ground pins (Pins 2,8,18,24) and AC-GND architecture minimize inter-zone crosstalk (<−50 dB), preserving spatial audio fidelity.

Use Scenario: Space-constrained infotainment board combining navigation, Bluetooth, and audio in sub-100 cm² footprint.

IC Role / Device Role / Timing Role: High-efficiency audio driver minimizing heat generation and eliminating need for heatsink mounting hardware.

Use Value: Low 50 µV A-weighted output noise and 65 dB SVR ensure clean audio even when sharing PCB real estate with noisy RF and digital subsystems.

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 (4 Ω), improved thermal resistance (0.9 °C/W), identical pinout and feature set.	Requires enhanced PCB copper pour or heatsinking due to higher power density; otherwise drop-in compatible.	Select for new designs needing marginally higher output or better thermal headroom under sustained 14.4 V operation.
TPA5560QPHPRQ1	Class D architecture, 4 × 40 W, 90% efficiency, integrated spread-spectrum PWM, but requires external LC filter per channel.	Lower thermal load but adds 8 passive components (inductors/caps); not suitable for space-limited layouts without filter area.	Select only when system-level efficiency >85% is mandatory and PCB area allows for four 2nd-order output filters.

Compared with TDA7387, TDA7388 offers higher output and thermal margin with zero design change, while TPA5560QPHPRQ1 trades BOM simplicity and analog transparency for efficiency - making TDA7387 optimal for cost-sensitive, layout-constrained Class AB implementations.

Availability

TDA7387 is available at Aetrix Electronics and suitable for automotive head units, aftermarket stereo receivers, multi-zone audio distribution systems, and compact infotainment modules requiring stable component supply across extended production lifecycles.

Supply support for TDA7387 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, designing and manufacturing microcontrollers, power ICs, sensors, and analog devices for automotive, industrial, and consumer markets.

The TDA7387 belongs to ST's automotive audio power amplifier product line, engineered specifically for high-fidelity, thermally robust, and cost-optimized Class AB amplification in space- and reliability-constrained car radio applications.

FAQ

What is the maximum safe supply voltage for continuous operation of the TDA7387?

The TDA7387 supports continuous DC supply up to 28 V, with peak transient tolerance of 50 V for durations ≤50 ms. Operation beyond 28 V DC risks permanent damage per absolute maximum ratings; automotive systems must include clamping or regulation to stay within this limit during load dump events.

Can the TDA7387 drive 2 Ω speakers?

No - the device is characterized and protected for 4 Ω minimum load impedance. Driving 2 Ω loads exceeds safe output current limits (5.5 A non-repetitive peak), triggers thermal limiting prematurely, and voids guaranteed distortion and power specifications per datasheet test conditions.

Is an external heat sink required for the TDA7387 in a typical car radio application?

Yes - although the Flexiwatt25 package features an exposed thermal pad, a properly sized aluminum heatsink (≥150 cm² surface area, 1–2 mm thickness) is required to maintain junction temperature ≤125 °C at 4 × 22 W output into 4 Ω with 40 °C ambient, per thermal data in Table 3.

How does the automute function respond to supply voltage sag during engine cranking?

The automute circuit disables output when VS falls below ~9–10 V (typical threshold), preventing audible thumps and speaker damage. Recovery occurs automatically once VS rises above ~11 V, with timing controlled by the SVR capacitor (C6) to ensure smooth, pop-free reactivation.

TDA7387 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:: 41W x 4 @ 4Ohm

Voltage - Supply:: -

Features:: -

Mounting Type:: Through Hole

Operating Temperature:: -40°C ~ 105°C (TA)

Grade:: -

Qualification:: -

Supplier Device Package:: 25-Flexiwatt (Vertical)

TDA7387 FAQ

1.How can I place an order for TDA7387 through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7387 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 TDA7387 reliable?

The price and inventory of TDA7387 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7387 is usually 5 days.

3.What payment methods are accepted for TDA7387?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7387 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7387?

TDA7387 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7387 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 TDA7387?

For technical support, including TDA7387 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7387 requirements.

6.How does Aetrix verify that TDA7387 is sourced from the original manufacturer or authorized distributors?

All TDA7387 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 TDA7387 meets industry standards.

7.What is the process for return or replacement of TDA7387?

All TDA7387 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7387, 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 TDA7387 part is unused and in its original packaging.

Return procedure for TDA7387:

1.Submit a request within 90 days.

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

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