Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics TDA7231A

Name: TDA7231A
Brand: STMicroelectronics
SKU: TDA7231A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: TDA7231A

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: TDA7231A.pdf

Description:: IC AMP AB MONO 1.8W 8MINI DIP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,269

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

TDA7231A from STMicroelectronics is a Class AB monolithic audio power amplifier in 4+4 lead MiniDIP package, operating from 1.8 V to 15 V supply, delivering up to 1.6 W into 8 Ω at 6 V, with 0.3% THD at 0.2 W and 38 dB closed-loop gain-designed for portable radios and cassette players.

For engineers reviewing the TDA7231A datasheet, TDA7231A pinout, TDA7231A application, or TDA7231A equivalent, key selection considerations include supply voltage range (1.8–15 V), quiescent current (3.6–9 mA), thermal resistance (80 °C/W junction-to-ambient), output power vs. load impedance, and soft clipping behavior under overload.

Technical Context

The TDA7231A integrates complementary bipolar output transistors with bias control circuitry to enable stable Class AB operation across a wide supply range. It features internal soft-clipping to limit peak output distortion and includes input bias current compensation (100 nA typ.) and high input resistance (100 kΩ).

Its thermal design relies on low R_{th j-pins} (15 °C/W) for heat transfer through pins to PCB copper, supporting operation up to 150 °C junction temperature. The device lacks shutdown or mute control, relying on external on/off switching via supply rail.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	1.8 V to 15 V - enables direct battery operation from single-cell Li-ion (3.7 V) to 3×AA (4.5 V) or 9 V PP3 without regulation
Output Power	1.6 W @ 6 V, 8 Ω - sufficient for small speaker drivers in portable audio without heatsinking
Total Harmonic Distortion	0.3% @ 0.2 W, 1 kHz, 8 Ω - meets fidelity requirements for consumer-grade playback at moderate volume
Closed-Loop Gain	38 dB - fixed internal gain simplifies design; no external feedback network required
Quiescent Current	3.6–9 mA - supports >20-hour runtime on 200 mAh alkaline cells in standby-critical portable devices
Input Resistance	100 kΩ - compatible with standard line-level or preamp outputs without loading
Thermal Resistance (j-amb)	80 °C/W - requires ≥2 cm² copper pour for safe 1.6 W continuous operation at 50 °C ambient

Pinout & Package

Package: MiniDIP-8 (4+4 lead configuration, 2.54 mm pitch), body dimensions 9.8 × 8.8 × 3.3 mm, with 7.62 mm centerline spacing between outer rows of pins.

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting Input	Accepts differential or single-ended input; referenced to pin 4 (ground) in standard non-inverting configuration
2	Non-Inverting Input	Primary signal input node; high-impedance (100 kΩ) path to internal diff pair
3	Ground	Power and signal reference plane; must be low-impedance connection to minimize noise coupling
4	Ground	Second ground terminal - used for thermal and current return path separation in layout
5	Output	Class AB push-pull output stage; drives capacitive-coupled 4–8 Ω loads directly
6	V_CC	Positive supply rail; accepts 1.8–15 V DC; bypass capacitor (≥100 µF) required at pin
7	V_CC	Second supply terminal - improves current distribution and reduces supply inductance
8	Bootstrap Capacitor	Connects to external 1 µF capacitor to extend positive swing and reduce crossover distortion

Key Features

Feature	Design Value
Soft Clipping	Gradual output limiting above rated power prevents harsh audible distortion during transient peaks
Low Crossover Distortion	Optimized bias network minimizes notch distortion near zero-crossing, critical for midrange clarity
Wide Supply Range	Operates down to 1.8 V - supports direct connection to partially discharged batteries in portable systems
High Power Capability	Delivers 1.6 W into 8 Ω at 6 V without external heat sinking - reduces BOM count and board space
Low Quiescent Current	3.6 mA typical at 6 V - extends battery life in always-on audio monitoring applications

Applications

Portable Radio Audio Stage

Cassette Player Output Driver

Use Scenario: Amplifying decoded FM/AM IF output to drive 3–5 cm dynamic speaker in handheld radio.

IC Role / Device Role / Timing Role: Final-stage Class AB power amplifier with fixed 38 dB gain and soft clipping protection.

Use Value: Eliminates need for discrete transistor output stage while maintaining <0.3% THD at listening volumes.

Use Scenario: Driving headphone jack and internal speaker in dual-mode cassette recorder/player.

IC Role / Device Role / Timing Role: Single-supply audio power amplifier with bootstrap-enhanced output swing.

Use Value: Enables full 1.6 W output from 6 V alkaline pack without DC-blocking capacitor at output.

USB-Powered Audio Dongle

Industrial Annunciator Tone Generator

Use Scenario: Low-cost USB audio adapter using microcontroller DAC output feeding analog amplifier stage.

IC Role / Device Role / Timing Role: Standalone analog output amplifier with high input impedance (100 kΩ) and minimal external components.

Use Value: Reduces component count to just 3 passive parts (bootstrap cap, input coupling cap, supply bypass) for plug-and-play audio output.

Use Scenario: Generating audible alert tones (400–2000 Hz) in panel-mounted industrial controllers with limited PCB area.

IC Role / Device Role / Timing Role: Self-contained tone driver with built-in gain and thermal protection up to 150 °C junction.

Use Value: Replaces op-amp + discrete transistor stages, improving reliability and reducing failure modes in unventilated enclosures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar audio amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM386N-1	Fixed 20 dB gain (vs. 38 dB); higher quiescent current (4 mA min.); no bootstrap pin; TO-99 package	Lacks soft clipping; lower max output power (0.7 W @ 9 V, 8 Ω); requires external gain-setting resistors for >20 dB	Prefer TDA7231A when higher gain, lower distortion, or MiniDIP layout compatibility is required
TDA2822M	Dual-channel stereo version; 0.65 W per channel @ 6 V, 8 Ω; 1.8–15 V supply; SO-16 package	Supports stereo output but consumes more board area; higher THD (1.5% vs. 0.3%) at rated power	Choose TDA7231A for mono applications where THD and thermal performance are prioritized over channel count

Compared with LM386N-1 and TDA2822M, the TDA7231A offers superior THD performance and higher fixed gain in a compact MiniDIP package, making it optimal for space-constrained mono audio systems requiring clean mid-power output without external gain tuning.

Availability

TDA7231A is available at Aetrix Electronics and suitable for portable radios, cassette players, and USB audio dongles requiring stable component supply despite its obsolete status-stock is verified and traceable from original STMicroelectronics production lots.

Supply support for TDA7231A 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, designing and manufacturing analog, MCU, power, and sensor ICs for automotive, industrial, and consumer markets.

The TDA7231A belongs to ST's legacy audio amplifier product line, engineered specifically for cost-sensitive, battery-powered portable audio equipment with stringent size and thermal constraints.

FAQ

Is the TDA7231A still in active production?

No-the TDA7231A is marked obsolete by STMicroelectronics as of September 2003. However, Aetrix Electronics maintains verified legacy stock from original manufacturing batches with full traceability, including date codes and lot numbers, supporting long-life industrial and repair programs.

What is the purpose of Pin 8 (Bootstrap) and what capacitor value is required?

Pin 8 connects to an external 1 µF capacitor (rated ≥16 V) between output and bootstrap node to elevate the upper transistor's base voltage during positive signal swings, extending output voltage headroom and reducing crossover distortion. Omitting this capacitor degrades THD and maximum output power.

Can the TDA7231A drive a 4 Ω speaker?

Yes-it delivers 0.7 W into 4 Ω at 6 V (per datasheet). However, power dissipation rises significantly; thermal derating is required above 6 V supply or ambient >40 °C. Layout must include ≥3 cm² copper pour tied to pins 3 and 4 for safe 4 Ω operation.

Does the TDA7231A include thermal shutdown or short-circuit protection?

No-the TDA7231A has no internal thermal shutdown or output short-circuit protection. Safe operation depends on proper PCB copper area, supply decoupling, and external fusing or current-limiting resistors in series with the speaker load to prevent latch-up or junction overheating beyond 150 °C.

TDA7231A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Type:: Class AB

Output Type:: 1-Channel (Mono)

Max Output Power x Channels @ Load:: 1.8W x 1 @ 8Ohm

Voltage - Supply:: 1.8V ~ 15V

Features:: -

Mounting Type:: Through Hole

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Supplier Device Package:: 8-Mini DIP

TDA7231A FAQ

1.How can I place an order for TDA7231A through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7231A 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 TDA7231A reliable?

The price and inventory of TDA7231A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7231A is usually 5 days.

3.What payment methods are accepted for TDA7231A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7231A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7231A?

TDA7231A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7231A 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 TDA7231A?

For technical support, including TDA7231A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7231A requirements.

6.How does Aetrix verify that TDA7231A is sourced from the original manufacturer or authorized distributors?

All TDA7231A 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 TDA7231A meets industry standards.

7.What is the process for return or replacement of TDA7231A?

All TDA7231A units undergo pre-shipment inspection (PSI). If there is an issue with TDA7231A, 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 TDA7231A part is unused and in its original packaging.

Return procedure for TDA7231A:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…