Diodes Incorporated S8M02600B

Overview

S8M02600B from Lite-On is a sensitive-gate silicon-controlled rectifier (SCR) rated for 600 V peak repetitive blocking voltage and 8 A RMS on-state current at 80 °C, with 80 A non-repetitive surge capability in a rugged TO-220AB package. It features glass-passivated junctions, specified IGT (5–200 µA), VGT (0.3–1.0 V), IH (0.5–6.0 mA), and dv/dt immunity ≥5 V/µs at 110 °C - used in AC motor control, solid-state relays, and phase-angle dimming circuits.

For engineers reviewing the S8M02600B datasheet, S8M02600B pinout, S8M02600B application, or S8M02600B equivalent, key selection criteria include gate sensitivity (IGT ≤200 µA), thermal resistance (RthJC = 2.2 °C/W), blocking voltage margin, surge rating (ITSM = 80 A), and TO-220AB mechanical compatibility in high-reliability industrial power switching designs.

Technical Context

This SCR operates as a unidirectional latching switch triggered by a low-energy gate pulse, requiring no continuous gate drive once conducting. Its sensitive gate enables direct microcontroller interface without buffer stages, supported by guaranteed IGT ≤200 µA and VGT ≤1.0 V at 25 °C.

Designed for line-frequency AC control, it sustains 600 V off-state blocking under full sine-wave conditions (50–60 Hz) with IDRM/IRRM ≤500 µA at 110 °C and exhibits robust dv/dt immunity (≥5 V/µs) to prevent false triggering during fast transients in noisy industrial environments.

Key Specifications

Pinout & Package

Package: TO-220AB - insulated back, 3-pin vertical mounting, 2.0 g mass, lead-free, rated for 260 °C soldering (10 s, 1/8″ from case).

Key Features

Applications

Equivalent & Alternatives

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

Compared with S8M02600B, TS820-600B trades gate sensitivity for broader qualification coverage, while VS-ST330A60 sacrifices RMS current headroom for superior transient immunity - making S8M02600B optimal for cost-sensitive, thermally constrained 8 A AC switching where gate drive is limited.

Availability

S8M02600B is available at Aetrix Electronics and suitable for AC motor control, solid-state relay replacement, and phase-angle dimming requiring stable component supply across industrial OEM production cycles.

Supply support for S8M02600B 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

Lite-On Semiconductor (LSC) is a Taiwan-based global supplier of discrete semiconductors, optoelectronics, and power devices, serving industrial, automotive, and consumer markets since 1975.

The S8M02-B series targets cost-effective, high-reliability AC power control applications - emphasizing gate sensitivity, thermal robustness, and surge resilience in TO-220AB packaging for legacy and new-design industrial power electronics.

FAQ

Is S8M02600B suitable for 240 VAC resistive load switching?

Yes. With 600 V VDRM and 8 A IT(RMS), it supports 240 VAC resistive loads up to ~1.1 kW continuously at TC = 80 °C. Derating is required above 80 °C ambient or with poor heatsinking; thermal design must maintain TJ ≤110 °C under worst-case conduction duty cycle.

What gate drive circuit is recommended for reliable triggering?

A 12 V pulse with ≥200 µA peak current and ≤1 µs width is sufficient. A series resistor of 10–47 kΩ from a 5 V MCU GPIO or optocoupler output meets IGT spec. Avoid sustained gate voltage - apply only brief pulses synchronized to AC zero-crossing for phase control.

Does S8M02600B require a heat sink in all applications?

Yes, for continuous operation above ~2 A RMS. With RthJC = 2.2 °C/W and maximum TJ = 110 °C, even at 4 A RMS (Pd ≈ 3.2 W), junction-to-case temperature rise exceeds 7 °C - necessitating a heatsink to limit case temperature and ensure long-term reliability and surge margin.

Can S8M02600B be used in DC circuits?

No - it is a half-wave (unidirectional) SCR designed for AC line-frequency commutation. In DC, once triggered, it remains latched until current falls below IH (≤6 mA). Without natural current zero-crossing, forced commutation (e.g., snubber + auxiliary switch) is required - not supported by this part's design or ratings.