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

STMicroelectronics TDA7388

Name: TDA7388
Brand: STMicroelectronics
SKU: TDA7388
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7388

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 25-Flexiwatt, Formed Leads

Datasheet:: TDA7388.pdf

Description:: IC AMP AB QUAD 41W 25FLEXIWATT

Quantity:: RFQ Add To RFQ list

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Inventory:296

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Product details

Overview

TDA7388 from STMicroelectronics is a quad-channel Class AB audio power amplifier in Flexiwatt25 package, delivering up to 4 × 45 W into 4 Ω loads at 14.4 V supply, with fixed 26 dB gain, mute/standby control, and integrated protections including short-circuit, thermal limiter, load dump, and reversed battery tolerance - deployed in premium automotive head units.

For engineers reviewing the TDA7388 datasheet, TDA7388 pinout, TDA7388 application, or TDA7388 equivalent, key selection criteria include output power per channel at 14.4 V, THD < 0.15 % at 4 W, SVR ≥ 65 dB, A-weighted output noise ≤ 70 µV, and compatibility with 4 Ω speaker loads in space-constrained car radio PCB layouts.

Technical Context

The TDA7388 employs a fully complementary PNP/NPN output stage enabling rail-to-rail voltage swing without bootstrap capacitors, reducing external component count. Its internal fixed gain (26 dB) and absence of external compensation simplify design while maintaining stability across temperature and supply variations.

Protection architecture includes soft thermal limiting triggered above junction temperature thresholds, output short-circuit detection to ground, VS, or across load, plus fortuitous open-GND and reversed-battery immunity - critical for unregulated automotive battery environments where supply can range from 6.5 V to 18 V DC.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	4 × 45 W max into 4 Ω @ 14.4 V, 1 kHz, 10 % THD - enables full-range high-fidelity audio in compact OEM head units without heatsink oversizing.
THD+N	0.04 % typ. @ 4 W, 4 Ω - ensures low audible distortion during mid-bass reproduction in cabin-acoustic-sensitive environments.
Supply Voltage Range	6.5 V to 18 V operating; 50 V peak (50 ms) - supports cold-crank (6.5 V) and load-dump (up to 50 V) transients per ISO 7637-2.
Quiescent Current	120–350 mA @ no load - balances idle power consumption against startup speed and thermal readiness in always-on infotainment systems.
Standby Current	≤ 20 µA - enables ultra-low-power sleep mode for CAN-wakeup head units meeting automotive ECU quiescent current budgets.
Input Impedance	70–100 kΩ - allows direct interface with standard preamp outputs without loading or signal attenuation.
SVR	65 dB typ. @ 100 Hz - suppresses alternator ripple and battery noise before amplification, minimizing hum in speaker output.

Pinout & Package

Package: Flexiwatt25 (vertical, 25-pin, thermally enhanced through-hole), with exposed metal backplate for direct heatsink mounting and R_{th j-case} ≤ 1 °C/W.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25	Channel A–D outputs, inputs, supplies, GND, mute, standby, SVR	25-pin layout optimized for four independent bridge-tied load (BTL) channels; pins 1–4 = CH1–CH4 OUT; pins 5–8 = CH1–CH4 IN; pins 9–10 = VS; pins 11–12 = GND; pin 22 = MUTE; pin 23 = STBY; pin 24 = SVR; pin 25 = GND.
22	Mute control input	Active-low TTL-compatible input; ≤1.5 V mutes all channels with ≥80 dB attenuation - prevents pop/click during source switching.
23	Standby control input	Active-low TTL-compatible input; ≤1.5 V disables amplifier bias, reducing I_q to ≤20 µA - enables system-level power sequencing.
24	SVR capacitor connection	Connects to 10 µF minimum electrolytic capacitor; governs turn-on/off timing and ripple rejection - critical for pop-free startup/shutdown.

Key Features

Feature	Design Value
Rail-to-rail output swing	Eliminates need for bootstrap capacitors, reducing BOM count and PCB area in multi-channel designs.
Integrated automute at low supply	Triggers muting below 6.5–8.5 V (V_{AM_in}) - protects speakers during brown-out and prevents distorted playback during cranking.
Thermal protection with soft limiter	Gradually reduces output power above safe junction temperature instead of hard shutdown - maintains audio continuity under thermal stress.
No external compensation required	Ensures stable operation with 4 Ω loads across temperature and supply voltage without loop compensation networks.
Reversed battery and load dump immunity	Withstands –18 V reverse polarity and 50 V/50 ms transients without latch-up or damage - meets automotive robustness requirements.

Applications

Automotive Head Unit

OEM Infotainment System

Use Scenario: Integrated 4-channel amplifier in factory-installed car stereo with AM/FM, Bluetooth, and USB media playback.

IC Role / Device Role / Timing Role: Final-stage Class AB power driver delivering full-range audio to front/rear speakers via BTL configuration.

Use Value: 45 W/channel output enables loud, distortion-free cabin audio even at highway speeds; automute prevents speaker damage during engine start.

Use Scenario: Audio subsystem in vehicle platform with digital signal processor (DSP) and multi-zone audio routing.

IC Role / Device Role / Timing Role: Analog output stage converting processed PCM signals to high-current speaker drive with precise channel isolation.

Use Value: 70 dB crosstalk minimizes inter-channel leakage; 65 dB SVR rejects alternator noise without additional filtering stages.

Aftermarket Car Stereo

Compact Vehicle Navigation Audio

Use Scenario: High-power aftermarket receiver supporting subwoofer preouts and 4-speaker distribution.

IC Role / Device Role / Timing Role: Primary audio power IC managing all four speaker channels with integrated mute/standby logic.

Use Value: Fixed 26 dB gain eliminates need for external gain-setting resistors; low 70 µV A-weighted noise preserves dynamic range of high-resolution sources.

Use Scenario: Space-constrained navigation unit with integrated voice guidance and hands-free telephony.

IC Role / Device Role / Timing Role: Low-quiescent-power audio amplifier activated only during voice prompts or call audio.

Use Value: ≤20 µA standby current extends battery life in accessory-mode operation; fast mute response (<10 ms) eliminates click on prompt start/stop.

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
TDA7377	Lower output power (4 × 28 W @ 14.4 V), smaller Flexiwatt23 package, no automute function	Suitable for cost-optimized entry-level head units without low-voltage protection requirement	Select when thermal budget is tighter and peak power demand is ≤28 W/channel.
TDA7851	Higher efficiency Class D topology, 4 × 70 W output, requires external gate drivers and LC filters	Used in premium systems requiring higher power density and lower thermal dissipation	Select when board space and heatsink mass must be minimized, accepting added filter complexity.

Compared with TDA7377, the TDA7388 delivers +17 W/channel more output and adds automute for cranking resilience; versus TDA7851, it avoids external filter components and simplifies EMC compliance but consumes more board area and thermal margin.

Availability

TDA7388 is available at Aetrix Electronics and suitable for automotive head units, OEM infotainment systems, and aftermarket car stereos requiring stable component supply, long-lifecycle support, and AEC-Q100-aligned robustness.

Supply support for TDA7388 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 analog, microcontroller, power, and automotive ICs for industrial and transportation markets.

The TDA7388 belongs to ST's automotive audio amplifier product line, engineered specifically for high-fidelity, thermally robust, and transient-tolerant Class AB amplification in 12 V vehicle electrical architectures.

FAQ

What is the maximum safe junction temperature for continuous operation?

The TDA7388 has an absolute maximum junction temperature of 150 °C, with thermal protection activating progressively above safe operating limits. For reliable continuous operation, maintain case temperature ≤70 °C using a heatsink with R_{th j-case} ≤1 °C/W and ensure airflow or conduction path integrity per Figure 13 mechanical data.

Can the TDA7388 drive 2 Ω speakers?

No - the TDA7388 is characterized and protected for 4 Ω minimum load impedance. Driving 2 Ω loads risks exceeding safe operating area (SOA), triggering thermal shutdown or causing permanent damage due to excessive current and power dissipation beyond its 80 W total dissipation limit.

Is external compensation required for stability?

No - the TDA7388 is internally compensated for unity-gain stability with 4 Ω loads and does not require external compensation components. Stability is verified across temperature, supply voltage, and capacitive load ranges per datasheet Section 2.3 and Figure 10.

How does the automute function respond to supply voltage dips?

The automute threshold is 6.5–8.5 V (V_{AM_in}); when supply drops below this window, the device automatically mutes all channels with ≥80 dB attenuation. Recovery occurs only after VS rises above 8.5 V and remains stable for >100 ms to prevent chatter during marginal cranking conditions.

TDA7388 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:: 8V ~ 18V

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

Mounting Type:: Through Hole

Operating Temperature:: -

Grade:: -

Qualification:: -

Supplier Device Package:: 25-Flexiwatt (Vertical)

TDA7388 FAQ

1.How can I place an order for TDA7388 through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7388 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 TDA7388 reliable?

The price and inventory of TDA7388 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7388 is usually 5 days.

3.What payment methods are accepted for TDA7388?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7388 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7388?

TDA7388 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7388 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 TDA7388?

For technical support, including TDA7388 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7388 requirements.

6.How does Aetrix verify that TDA7388 is sourced from the original manufacturer or authorized distributors?

All TDA7388 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 TDA7388 meets industry standards.

7.What is the process for return or replacement of TDA7388?

All TDA7388 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7388, 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 TDA7388 part is unused and in its original packaging.

Return procedure for TDA7388:

1.Submit a request within 90 days.

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

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