Diodes Incorporated S08U50600A

Overview

S08U50600A from Diodes Incorporated is a sensitive-gate silicon-controlled rectifier (SCR) designed for AC phase control and solid-state switching in low-power line-synchronized applications. It features 600 V peak repetitive blocking voltage, 0.8 A RMS on-state current at +80°C case temperature, 50 µA gate trigger current at +25°C, and TO-92 package with cathode–gate–anode pinout. Used in compact dimmer circuits, small appliance motor controls, and relay replacement modules.

For engineers reviewing the S08U50600A datasheet, S08U50600A pinout, S08U50600A application, or S08U50600A equivalent, key selection criteria include gate sensitivity (IGT = 50 µA), dV/dt immunity (≥20 V/µs at TJ = +110°C), thermal resistance (RthJC = 75 °C/W), holding current (IH = 5 mA at +25°C), and RoHS-compliant "Green" TO-92 packaging.

Technical Context

This SCR operates as a latching unidirectional switch triggered by a low-energy gate pulse. Its sensitive gate enables direct drive from microcontroller GPIO pins without external amplification, while glass-passivated junction ensures stable VGT and IGT across temperature (–40°C to +110°C).

It sustains 600 V reverse-blocking capability under sine-wave AC line conditions (50–60 Hz) with gate open, and supports surge currents up to 10 A (½-cycle, 60 Hz). Critical dV/dt rating of 20 V/µs prevents false triggering during fast voltage transients in noisy mains environments.

Key Specifications

Pinout & Package

TO-92 (TO-226AA) plastic package with axial leads; glass-passivated die for moisture and contamination resistance; Pb-free, RoHS-compliant, halogen- and antimony-free "Green" construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SCR switching applications.

Compared with S08U25600A and BT169G, the S08U50600A delivers superior mains-voltage headroom (600 V), verified dV/dt immunity (20 V/µs), and tighter gate parameter specifications-making it the preferred choice for 230 VAC industrial and consumer equipment requiring reliable, low-component-count phase control.

Availability

S08U50600A is available at Aetrix Electronics and suitable for AC dimmer modules, small-appliance motor drives, relay-replacement circuits, and overvoltage protection systems requiring stable component supply and legacy design continuity.

Supply support for S08U50600A 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The S08xxA Series(LS) was developed specifically for cost-sensitive, space-constrained AC line-switching applications requiring high gate sensitivity, robust transient immunity, and regulatory-compliant packaging-targeting consumer electronics, white goods, and building automation.

FAQ

Is S08U50600A still in active production?

No-Diodes Incorporated has officially discontinued the S08U50600A and entire S08xxA SERIES(LS). It is marked "OBSOLETE – PART DISCONTINUED" in the latest datasheet (DS43874 Rev. 7-4, March 2026). Aetrix Electronics maintains limited legacy stock for design continuity and last-time buy support, but no new production is planned.

Can S08U50600A be used in 120 VAC applications?

Yes-its 600 V VRRM provides ample margin for 120 VAC systems (peak ≈ 170 V), including surge events per ANSI C84.1. The device's 0.8 A IT(RMS) rating and thermal characteristics remain fully applicable; however, gate drive and snubber design should still follow Diodes' recommended practices for the target load type and ambient conditions.

What is the maximum allowable gate resistor value for MCU-driven operation?

With a 5 V MCU GPIO driving the gate through a series resistor RG, and VGT(max) = 1.2 V at –40°C, the maximum RG is calculated as (5 V – 1.2 V) / 50 µA = 76 kΩ. However, for reliable turn-on across temperature and process variation, Diodes recommends RG ≤ 47 kΩ to ensure ≥2× IGT margin at worst-case conditions.

Does S08U50600A require a heat sink in typical operation?

No-under typical 0.8 A RMS conduction at +80°C case temperature, power dissipation remains ≤0.5 W (VTM × IT(avg)). With RthJC = 75 °C/W and RthJA = 150 °C/W, junction temperature rise stays within limits using standard TO-92 PCB copper area (≥1 cm² per lead). A heat sink is unnecessary unless operating continuously near derated limits or in sealed enclosures above +60°C ambient.