Diodes Incorporated S08M02600A

Overview

S08M02600A from Diodes Incorporated is a sensitive-gate silicon-controlled rectifier (SCR) designed for AC phase-control and solid-state switching in low-power mains-connected circuits. It provides 600 V peak repetitive blocking voltage, 0.8 A RMS on-state current at +80°C case temperature, 200 µA gate trigger current, and 20 V/µs dV/dt immunity - enabling direct drive from microcontroller GPIO pins in lighting dimmers and appliance motor controls.

For engineers reviewing the S08M02600A datasheet, S08M02600A pinout, S08M02600A application, or S08M02600A equivalent, key selection criteria include gate sensitivity (IGT = 200 µA max), thermal derating above +80°C, TO-92 package mounting constraints, and compatibility with zero-crossing or phase-angle control topologies requiring reliable turn-on at low gate energy.

Technical Context

The S08M02600A operates as a unidirectional, reverse-blocking thyristor with latching behavior triggered by a positive gate pulse relative to cathode. Its sensitive gate enables activation with ≤0.8 V gate trigger voltage and ≤200 µA gate current under standard test conditions (VD = 7.0 Vdc, RL = 100 Ω).

It sustains conduction until anode current falls below 5 mA holding current (IH) at +25°C, and remains immune to false triggering up to 20 V/µs rate of voltage rise across anode–cathode when junction temperature reaches +110°C - critical for noisy AC line environments.

Key Specifications

Pinout & Package

Supplied in TO-92 (TO-226AA) plastic package with axial leads, glass-passivated chip surface, and Pb-free/RoHS-compliant finish. Dimensions: A = 4.45–4.70 mm, B = 4.32–5.33 mm, C = 3.18–4.19 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S08U25600A and BT169G, the S08M02600A offers balanced gate sensitivity and robust 600 V/20 V/µs performance ideal for global 230 VAC dimmers and motor controllers where both low drive strength and noise resilience are required.

Availability

S08M02600A is available at Aetrix Electronics and suitable for lighting dimmers, small-appliance motor drives, AC solid-state relays, and overvoltage crowbar circuits requiring stable component supply across extended production lifecycles.

Supply support for S08M02600A 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 North America.

The S08xxA series belongs to Diodes' legacy SCR product line targeting cost-effective, low-power AC control applications - emphasizing gate sensitivity, thermal stability, and regulatory compliance for consumer and industrial equipment.

FAQ

Is the S08M02600A still in active production?

No - Diodes Incorporated has officially discontinued the S08M02600A and the entire S08xxA SERIES(LS). The datasheet states "OBSOLETE – PART DISCONTINUED" on multiple pages. Aetrix Electronics maintains limited legacy stock for existing design continuity, but no new production is planned.

Can the S08M02600A replace the BT136 or TIC206 in existing designs?

It can functionally replace those SCRs in low-current (<0.8 A RMS), 600 V-class applications, but pinout differs: BT136 uses TO-220 (K-G-A), TIC206 uses TO-92 but with Anode/Gate/Cathode order. S08M02600A uses Cathode/Gate/Anode (1-2-3), requiring PCB layout revision and gate drive verification.

What is the maximum allowable gate-cathode reverse voltage?

The datasheet does not specify a rated negative gate-cathode voltage. Gate terminals are designed for unidirectional positive triggering only. Applying reverse voltage may cause irreversible gate junction damage; external clamping diodes are recommended if gate drive circuits risk negative excursions.

How does thermal resistance affect real-world current handling?

With R_thJC = 75 °C/W and R_thJA = 150 °C/W, junction temperature rises rapidly without heatsinking. At 0.8 A RMS, power dissipation is ~1.36 W (V_TM × I_T(AV)). Without a heatsink, case temperature exceeds +80°C within seconds - derating to ≤0.4 A is necessary for sustained operation in still air.