STMicroelectronics X0202DA 5BL2

Overview

X0202DA 5BL2 from STMicroelectronics is a sensitive-gate silicon-controlled rectifier (SCR) rated for 1.25 A RMS on-state current and 600 V repetitive peak off-state voltage (VDRM), with gate trigger current (IGT) as low as 50 µA in Q1 quadrant. It features low forward voltage drop (max 1.45 V at 2.5 A), high dV/dt immunity (min 15 V/µs), and is optimized for crowbar protection and capacitive ignition circuits where low-energy gate drive is required.

For engineers reviewing the X0202DA 5BL2 datasheet, X0202DA 5BL2 pinout, X0202DA 5BL2 application, or X0202DA 5BL2 equivalent, key selection criteria include its 50 µA IGT sensitivity, TO-92 package thermal resistance (Rth(j-l) = 60 °C/W), 25 A non-repetitive surge rating, and suitability for ground fault interruption and overvoltage clamping in compact power supplies.

Technical Context

This SCR operates in quadrant I (positive anode, positive gate relative to cathode) with guaranteed triggering at ≤50 µA IGT and latching current (IL) ≤6 mA. Its 15 V/µs dV/dt immunity at 110 °C and 500 µA max reverse leakage at 125 °C support reliable operation in noisy, high-temperature environments.

The device uses planar passivated junction technology and is characterized for full-cycle conduction. Thermal performance is defined by junction-to-lead resistance (60 °C/W) and operating junction temperature range of –40 to +125 °C, enabling use in thermally constrained TO-92 layouts without forced cooling.

Key Specifications

Pinout & Package

Supplied in TO-92 package (3-lead, axial leaded plastic case) with standard anode–gate–cathode terminal arrangement. Leads are tin-plated, halogen-free, and RoHS-compliant per ECOPACK® specifications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SCR-based protection and switching applications.

Compared with STX0202NA and S4006L, X0202DA 5BL2 delivers the lowest gate drive burden and highest dV/dt immunity in the smallest footprint, making it optimal for miniaturized, low-power crowbar and ignition circuits where gate energy is strictly limited.

Availability

X0202DA 5BL2 is available at Aetrix Electronics and suitable for ground fault circuit interrupters, overvoltage crowbar protection in power supplies, and capacitive ignition circuits requiring stable component supply and long-term manufacturability.

Supply support for X0202DA 5BL2 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

X0202DA 5BL2 belongs to ST's X02 family of sensitive-gate SCRs, engineered specifically for low-energy triggering in safety-critical protection circuits and electromechanical replacement applications.

FAQ

What is the correct gate resistor value for reliable triggering of X0202DA 5BL2?

A series gate resistor of 100 Ω to 470 Ω is recommended when driving from a 5 V logic source. This limits peak gate current to <1.2 A (within IGM rating), ensures ≥50 µA IGT is delivered even with worst-case VGT (0.8 V), and damps ringing that could cause false turn-on. Lower values risk exceeding PG(AV) = 0.2 W under repeated pulsing.

Can X0202DA 5BL2 be used in bidirectional AC switching applications?

No - X0202DA 5BL2 is a unidirectional SCR optimized for quadrant I operation (positive anode, positive gate). It cannot block or conduct reverse voltage. For bidirectional AC control, a TRIAC such as ST's BT139-600E or two anti-parallel SCRs are required.

How does thermal derating work for X0202DA 5BL2 in TO-92 package?

At TL = 63 °C, IT(RMS) is rated 1.25 A. Above this lead temperature, current must be linearly reduced: at TL = 80 °C, max IT(RMS) = 0.95 A; at TL = 100 °C, max IT(RMS) = 0.5 A. Derating follows Rth(j-l) = 60 °C/W and Tj(max) = 125 °C, with no heatsink assumed.

Is X0202DA 5BL2 compliant with modern environmental standards?

Yes - it meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. The TO-92 package uses lead-free plating and halogen-free molding compound, certified under ST's ECOPACK®2 specification with full material declarations available upon request.