STMicroelectronics STA50813TR

Overview

STA50813TR 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 80 + 80 W @ THD = 10% into 8 Ω at V_CC = 35 V (dual bridge), or 160 W peak @ THD = 10% into 4 Ω (single BTL), with 200 mΩ R_dsON, CMOS-compatible logic inputs, and integrated thermal/undervoltage protection.

For engineers reviewing the STA50813TR datasheet, STA50813TR pinout, STA50813TR application, or STA50813TR equivalent, this device supports reconfigurable bridge topologies (dual, single BTL, or binary half-bridge), features thermal warning and fault reporting outputs, and requires precise dead-time management for Class-D audio output stages.

Technical Context

The STA50813TR integrates four independent half-bridge channels, each with complementary DMOS output stages and matched R_dsON (≥95% P/N channel matching). Its CONFIG pin enables topology reconfiguration: tied to V_DD, it merges channels into a single high-current BTL bridge; grounded, it operates as two independent dual-bridge pairs.

Input thresholds scale with VL voltage (e.g., V_IN-HIGH = VL/2 + 300 mV), supporting flexible logic-level interfacing. Protection circuitry includes undervoltage lockout (7 V threshold), thermal shutdown (>150 °C), and open-drain FAULT/TH_WAR outputs with defined logic states per Table 2 - enabling real-time system monitoring without external supervision logic.

Key Specifications

Pinout & Package

STA50813TR uses the PowerSO-36 (EPU) package with exposed thermal pad on bottom side, optimized for high-power audio applications requiring efficient heat transfer to PCB copper planes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TAS5634PHPR and IRS2092SPBF, STA50813TR uniquely combines topology flexibility (CONFIG pin), embedded thermal warning, and matched R_dsON in a single PowerSO-36 package - reducing system-level validation effort and improving thermal predictability in production audio systems.

Availability

STA50813TR is available at Aetrix Electronics and suitable for home theater amplifiers, automotive infotainment systems, and professional audio DSP amplifiers requiring stable component supply and long-term industrial availability.

Supply support for STA50813TR 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 power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.

STA50813TR belongs to ST's high-efficiency audio power stage product line, engineered specifically for DDX™ and other all-digital Class-D amplifier architectures demanding low distortion, high power density, and integrated protection.

FAQ

What is the recommended PCB layout for thermal management of STA50813TR?

The PowerSO-36 package features an exposed thermal pad that must be soldered to a large copper pour connected to internal ground planes via ≥6 thermal vias (0.3 mm diameter, spaced ≤1.5 mm apart). ST Application Note AN1661 specifies minimum 400 mm² copper area under the pad; insufficient copper or via count causes junction temperature to exceed 150 °C at <40 W dissipation.

How does the CONFIG pin affect current capability in single-BTL mode?

When CONFIG is tied to V_DD, OUT1A/OUT1B and OUT2A/OUT2B are internally paralleled, doubling effective current capacity to 9 A peak (vs. 4.5 A per half-bridge). This is confirmed by DS3503 Rev 6 Figure 6 and Table 5's I_sc = 4.5–9 A range - the upper limit applies only in CONFIG = 1 mode with proper thermal design.

Can STA50813TR operate with 24 V supply instead of 35 V?

Yes - V_CC range is 10–36 V per Table 3. At 24 V, output power scales quadratically: ~37 W × 2 into 8 Ω (dual bridge) and ~74 W peak into 4 Ω (BTL), maintaining full functionality including thermal protection, FAULT reporting, and CMOS logic compatibility. No derating is required below 35 V.

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

VL sets the reference voltage for input threshold levels (V_IN-HIGH = VL/2 + 300 mV). It must be connected to the same 3.3 V supply used by the driving controller - not to V_CC or analog ground. Incorrect VL connection causes input misinterpretation; DS3503 Rev 6 Table 6 shows valid VL range is 2.7–5.0 V with corresponding V_LOW/V_HIGH bounds.