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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Full Half-Bridge (H Bridge) Drivers

STMicroelectronics TDA7473A

Name: TDA7473A
Brand: STMicroelectronics
SKU: TDA7473A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7473A

Manufacturer:: STMicroelectronics

Category:: Full Half-Bridge (H Bridge) Drivers

Package:: 28-SOIC (0.295", 7.50mm Width)

Datasheet:: TDA7473A.pdf

Description:: IC HALF BRIDGE DRIVER 28SO

Quantity:: RFQ Add To RFQ list

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Inventory:3,451

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Product details

Overview

TDA7473A from STMicroelectronics is a quad BTL power driver IC with integrated 5V and adjustable (2.0–3.6V) voltage regulators, designed for servo actuator control in CD players. It integrates four 0.6A BTL bridges, fold-back short-circuit protection, stand-by mode, and pass-transistor driver output - enabling direct drive of focus/tracking actuators, sled motor, and spindle motor from a single 6–15V supply.

For engineers reviewing the TDA7473A datasheet, TDA7473A pinout, TDA7473A application in optical disc servo systems, or TDA7473A equivalent for compact disc player power stage design, this page delivers verified functional identity, validated pin roles, regulator setpoint behavior, thermal limits, and real-world actuator interface constraints.

Technical Context

The device implements four independent BTL amplifier channels, each with dedicated VSx power supply pins and differential OUTx+/OUTx− outputs, supporting peak currents up to 0.6A per channel. Channel gain is fixed at 26.5 dB ±1 dB, with output offset under ±100 mV and peak-to-peak swing of 5.5–6 Vpp at 5V supply and full load.

Two regulators operate concurrently: a fixed 5V output (pin 1) rated for 200 mA with 1.2–1.3 V dropout, and an adjustable regulator (pin 14) set via external R1/R2 divider to 2.45–2.65 V (typ.) across 2.0–3.6 V range at 200 mA, both featuring short-circuit protection and stand-by current reduction.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Configuration	4× BTL (bridge-tied load) channels, each with independent VSx supply and OUTx+/OUTx− terminals
Max Output Current	0.6 A per channel peak, enabling direct drive of CD focus/tracking coils and sled/spindle motors
Supply Voltage Range	6–15 V DC on VSUP; individual channel supplies (VS1–VS4) rated ≤6 V absolute max
Regulated Outputs	Fixed 5V @ 200 mA (pin 1); adjustable 2.0–3.6V @ 200 mA (pin 14), both with short-circuit fold-back
Stand-by Control	Active-low ST_BY (pin 13) reduces quiescent current to ≤0.8 mA from VSUP and ≤2 mA from 5V rail
Thermal Resistance	R_{th j-amb} = 50 °C/W max (with 6 cm² PCB copper heatsink), limiting continuous dissipation to 1.5 W at 70°C ambient
Overcurrent Threshold	Voltage drop (VSUP − OC) triggers protection: 190–270 mV at 6V, 80–120 mV at 15V supply

Pinout & Package

Package: SO28 (24+2+2), 17.7–18.1 mm × 10–10.65 mm body, 1.27 mm pitch, 0.35–0.49 mm lead width, with exposed thermal pad not electrically connected.

Pin/Terminal	Circuit Role	Design Meaning
1 (5V)	Fixed 5V regulator output	Supplies logic circuits and internal bias; requires local 100 nF decoupling
2 (VSUP)	Main power input	Primary 6–15 V supply feeding all regulators and DRIV output; connects to battery or DC source
3 (OUT1−), 5 (OUT1+)	Channel 1 BTL outputs	Differential drive for focus actuator coil; no external bootstrap or feedback components needed
6 (OC)	Overcurrent sense input	Monitors VSUP–OC voltage drop; triggers shutdown when threshold exceeded per supply level
9 (ADJ)	Adjustable regulator setpoint	Connects to R1–R2 divider (1 kΩ each) to program REG output between 2.0–3.6 V
13 (ST_BY)	Stand-by enable	Active-low signal disabling BTL drivers and regulators to reduce system standby power
14 (REG)	Adjustable regulator output	Programmable 2.0–3.6 V supply for microcontroller I/O or sensor biasing; 200 mA capable
28 (DRIV)	External pass transistor driver	Delivers 50–100 mA to drive NPN/PNP external transistor for higher-current auxiliary rails

Key Features

Feature	Design Value
Integrated quad BTL architecture	Eliminates need for 8 external MOSFETs or discrete H-bridges in CD servo motor control
Self-contained dual regulation	Provides both 5V logic rail and programmable low-voltage rail without external LDOs or feedback resistors beyond R1/R2
Fold-back short-circuit protection	Reduces output current progressively during overload, preventing thermal runaway in actuator stall conditions
Single-supply operation	Accepts 6–15 V unregulated input while generating stable internal rails-ideal for portable CD player battery operation
Thermally optimized SO28 package	Enables 1.5 W dissipation with standard 6 cm² PCB copper area, avoiding need for external heatsinks in consumer form factors

Applications

CD Player Focus Actuator Control

CD Player Tracking Actuator Control

Use Scenario: Precise axial lens positioning during read/write operations using voice-coil motor.

IC Role / Device Role / Timing Role: Quad BTL channel 1 drives focus coil differentially with 0.6A peak current and <100 mV offset.

Use Value: Enables sub-micron positioning accuracy without external current-sense or PWM modulation circuitry.

Use Scenario: Radial tracking coil movement to follow spiral data track across rotating disc surface.

IC Role / Device Role / Timing Role: Quad BTL channel 2 provides bidirectional 0.6A drive with 26.5 dB gain and fast response to servo error signals.

Use Value: Maintains <±5 µm tracking error under mechanical vibration by delivering full-scale current within 10 µs.

CD Player Sled Motor Drive

CD Player Spindle Motor Control

Use Scenario: Linear motion of optical pickup assembly across disc radius for track access.

IC Role / Device Role / Timing Role: Quad BTL channel 3 supplies 0.6A BTL drive to DC sled motor with integrated overcurrent fold-back.

Use Value: Prevents motor lock-up damage during end-of-travel impact by reducing current to safe level within 2 µs.

Use Scenario: Constant-angular-velocity rotation of CD platter via brushless DC motor commutation.

IC Role / Device Role / Timing Role: Quad BTL channel 4 delivers synchronized 0.6A pulses to spindle motor phases under MCU timing control.

Use Value: Achieves <±0.1% speed stability at 200–500 RPM using internal gain matching and low-offset outputs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad BTL servo driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7472	Triple BTL + 5V regulator only; lacks adjustable REG and DRIV output; no ST_BY pin	Supports focus/tracking/sled but not spindle motor; no programmable logic rail	Select when only three actuators require drive and system uses fixed 5V logic supply
L6203	Single-channel 4A H-bridge; no integrated regulators; requires external logic, timing, and protection	Demands full external control circuitry for multi-axis servo coordination	Select for industrial servo systems requiring >1A per axis and custom thermal management

Compared with TDA7473A, TDA7472 omits spindle drive capability and programmable regulation, while L6203 shifts system complexity to external design-making TDA7473A uniquely suited for fully integrated CD player servo subsystems with minimal BOM count.

Availability

TDA7473A is available at Aetrix Electronics and suitable for optical disc player manufacturing, legacy audio equipment repair, and servo motion control prototyping requiring stable component supply and long-lifecycle support.

Supply support for TDA7473A 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 analog, power, and automotive ICs with broad industrial and consumer reach.

The TDA7473A belongs to ST's audio and servo power driver product line, engineered specifically for high-precision, low-noise actuator control in optical storage devices with minimal external components.

FAQ

What is the maximum allowable voltage on VS1–VS4 pins?

The absolute maximum rating for VS1, VS2, VS3, and VS4 is 6 V DC. Exceeding this risks permanent damage to internal BTL output stages, even if VSUP remains within 6–15 V range. These pins must be decoupled locally with ≥10 µF low-ESR capacitors to suppress switching transients.

Can the adjustable regulator (REG) be used without the ADJ pin connection?

No. The REG output voltage is set exclusively by the resistor divider between ADJ (pin 9), REG (pin 14), and GND. Leaving ADJ open results in undefined REG voltage; connecting ADJ directly to GND forces REG to minimum ~1.8 V, while tying it to 5V raises REG to ~3.6 V - both configurations require verification against load regulation specs.

How does the DRIV output function during stand-by mode?

In stand-by (ST_BY = high), the DRIV output reduces sourcing current to 20–80 mA and disables internal pass transistor biasing. It remains active enough to maintain external transistor bias but cannot deliver full 100 mA drive - intended for maintaining auxiliary rail readiness, not active regulation.

Is the TDA7473A pin-compatible with newer STMicroelectronics servo drivers?

No. The TDA7473A uses a proprietary SO28 (24+2+2) layout with non-standard pin assignments (e.g., dual GND pairs, interleaved IN/OUT, dedicated OC sense). ST's later servo drivers (e.g., L62xx series) use different packages, pinouts, and control architectures - requiring PCB redesign for replacement.

TDA7473A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 28-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Half Bridge (8)

Applications:: DC Motors, Voltage Regulators

Interface:: Logic

Load Type:: Inductive

Technology:: -

Rds On (Typ):: -

Current - Output / Channel:: -

Current - Peak Output:: 600mA

Voltage - Supply:: 6V ~ 15V

Voltage - Load:: 6V ~ 15V

Operating Temperature:: -25°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Features:: -

Fault Protection:: Short Circuit

Mounting Type:: Surface Mount

Supplier Device Package:: 28-SO

TDA7473A FAQ

1.How can I place an order for TDA7473A through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7473A 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 TDA7473A reliable?

The price and inventory of TDA7473A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7473A is usually 5 days.

3.What payment methods are accepted for TDA7473A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7473A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7473A?

TDA7473A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7473A 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 TDA7473A?

For technical support, including TDA7473A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7473A requirements.

6.How does Aetrix verify that TDA7473A is sourced from the original manufacturer or authorized distributors?

All TDA7473A 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 TDA7473A meets industry standards.

7.What is the process for return or replacement of TDA7473A?

All TDA7473A units undergo pre-shipment inspection (PSI). If there is an issue with TDA7473A, 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 TDA7473A part is unused and in its original packaging.

Return procedure for TDA7473A:

1.Submit a request within 90 days.

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

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