STMicroelectronics STA51813TR

Overview

STA51813TR from STMicroelectronics is a monolithic quad half-bridge power stage in Multipower BCD technology, designed as the output stage for stereo all-digital DDX™ amplifiers. It delivers 24 W × 4 channels into 4 Ω (single-ended), 50 + 50 W into 8 Ω (BTL), or 70 W into 8 Ω (paralleled BTL) at THD = 10%, with 40 V max supply voltage, 3.5 A peak current capability, and integrated thermal/short-circuit/undervoltage protection.

For engineers reviewing the STA51813TR datasheet, STA51813TR pinout, STA51813TR application, or STA51813TR equivalent, key selection criteria include R_DS(on) matching (95% P/N channel), low dead time (10–50 ns), CMOS-compatible logic inputs referenced to VL, thermal warning output (130 °C), and PowerSSO36 package with exposed thermal slug for high-power audio output stages.

Technical Context

The STA51813TR implements dual full-bridge or reconfigurable single-bridge operation via CONFIG pin control, supporting DDX® ternary modulation and binary PWM modes. Its logic interface accepts two input signals per channel (INxA/INxB), decoded into four internal MOSFET gate drives (Q1–Q4) with programmable dead time (10 ns static, 50 ns dynamic) to prevent shoot-through.

Protection architecture includes undervoltage lockout (7 V threshold), thermal shutdown at 150 °C with 25 °C hysteresis, open-drain FAULT (pin 27) and TH_WAR (pin 28) outputs, and short-circuit current limiting (3.5–6 A). The device integrates on-chip 5 V regulators (VDD/VSS) and uses VL-referenced input thresholds for robust logic interfacing.

Key Specifications

Pinout & Package

STA51813TR is housed in PowerSSO36 (slug-up) package with 36-pin layout and exposed thermal pad on top surface for direct heatsink attachment. All duplicate power, ground, and output pins must be connected in parallel for rated performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad half-bridge audio output applications.

Compared with TAS5381AIPAG and IRS2092SPBF, STA51813TR offers superior integration (on-chip MOSFETs, regulators, thermal warning, and reconfigurable topology) for mid-power (24–70 W) consumer and automotive audio, reducing design cycle time and component count without sacrificing protection robustness.

Availability

STA51813TR is available at Aetrix Electronics and suitable for home audio amplifiers, automotive infotainment systems, and professional PA modules requiring stable component supply, long-lifecycle support, and production-ready qualification.

Supply support for STA51813TR 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, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.

The STA518 product line targets high-efficiency digital audio output stages, specifically engineered to replace discrete MOSFET/gate-driver combinations in DDX™ and binary PWM-based Class-D amplifiers with integrated protection and thermal intelligence.

FAQ

What is the recommended heatsink thermal resistance for STA51813TR in 70 W BTL operation?

For 70 W output in paralleled BTL mode at T_case = 70 °C, total thermal resistance (junction-to-ambient) must be ≤ 3.8 °C/W. With 1.5 °C/W junction-to-slug and ~2.3 °C/W thermal interface (grease), a heatsink ≤ 0.5 °C/W is required. ST recommends forced-air cooling or large aluminum extrusions; thermal pads are not advised per datasheet.

How does the CONFIG pin change the STA51813TR's operational mode?

When CONFIG (pin 24) is connected to VDD, the device reconfigures as a single high-current bridge: OUT1A/OUT1B and OUT2A/OUT2B are internally paralleled, doubling current capacity to 7 A peak and enabling 70 W into 8 Ω. In default mode (CONFIG floating or grounded), it operates as quad half-bridge or dual BTL.

Can STA51813TR drive 2 Ω loads safely?

No. The device is characterized and qualified for 4–8 Ω loads only. Driving 2 Ω would exceed 3.5 A peak current limit and cause immediate thermal shutdown or latch-up, as R_DS(on) and thermal design assume minimum 4 Ω impedance. Use external current limiting or select higher-current alternatives like STA516B for lower impedances.

What is the purpose of the VL pin, and how should it be decoupled?

VL sets the input logic threshold (V_IN-H/V_IN-L = V_L/2 ± 300 mV) and must match the controller's logic supply (2.7–5.0 V). It requires a local 100 nF ceramic capacitor to GND-Clean (pin 19) placed within 5 mm of the pin, as specified in Section 4.1 of the datasheet, to suppress noise coupling into the sensitive input comparator network.