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40 V, 3.5 A quad power half-bridge digital audio amplifier
  • active Active

STA518 is a monolithic quad half bridge stage in multipower BCD technology. The device can be used also as dual bridge or reconfigured, by connecting CONFIG pin to Vddpin, as single bridge with double current capability.

The device is particularly designed to make the output stage of a stereo all-digital high efficiency (DDX™) amplifier capable to deliver an output power of 24 W x 4 channels @ THD = 10% at VCC30 V on 4 W load in single ended configuration.

It can also deliver 50 + 50 W @ THD = 10% at VCC29 V as output power on 8 W load in BTL configuration and 70 W @ THD = 10% at VCC34 V on 8 W in single paralleled BTL configuration.

The input pins have threshold proportional to VLpin voltage.

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Errata Sheet
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Key Features

  • Multipower BCD technology
  • Minimum input output pulse width distortion
  • 200 mΩ RdsON complementary DMOS output stage
  • CMOS compatible logic inputs
  • Thermal protection
  • Thermal warning output
  • Undervoltage protection
  • Short-circuit protection

Circuit Diagram

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS3981: 40 V, 3.5 A quad power half bridge
6.0 565 KB

Application Notes

Description Version Size
AN3340: Loudspeaker characterization and compensation
1.3 3,944 KB

Presentations & Training Material

Training Material

Description Version Size
Learn the basics about STSpeakerSafe technology
1.0 181 KB
Learn the basics about STSpeakerSafe technology
1.0 197 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STA51813TRActivePowerSSO 36Tape And Reel-4090_-2.485No availability reported, please contact our Sales officeEcopack2PDF

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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