STMicroelectronics X00619MA5AL2

Overview

X00619MA5AL2 from STMicroelectronics is a sensitive-gate silicon-controlled rectifier (SCR) in TO-92 preformed leads tape-and-reel packaging, rated for 0.8 A RMS on-state current and 600 V repetitive peak off-state voltage, with gate trigger current spanning 30–200 µA; it serves as a low-power latching switch in crowbar protection circuits, electronic ballasts, and capacitive discharge ignitors where gate drive current is limited.

For engineers reviewing the X00619MA5AL2 datasheet, X00619MA5AL2 pinout, X00619MA5AL2 application, or X00619MA5AL2 equivalent, this part supports design of compact overvoltage protection, ground fault interruption, and ignition timing control requiring low I_GT, high dV/dt immunity (>40 V/µs), and operation up to 125 °C junction temperature.

Technical Context

The X00619MA5AL2 operates as a unidirectional thyristor with sensitive gate triggering, enabling reliable turn-on under low-current drive conditions. Its static dV/dt immunity exceeds 40 V/µs at 125 °C with 1 kΩ gate-cathode resistance, and its holding current remains ≤5 mA across –40 to +125 °C.

Thermal performance is defined by R_th(j-l) = 70 °C/W (TO-92) and R_th(j-a) = 150 °C/W (free air), supporting stable conduction at 0.5 A average current up to 83 °C lead temperature. The device features low on-state voltage (V_TM ≤1.35 V at 1 A, 25 °C) and dynamic resistance ≤245 mΩ at 125 °C.

Key Specifications

Pinout & Package

Package: TO-92 with preformed leads (plastic, lead-free plating, halogen-free molding compound, UL94 V0 compliant). Dimensions per DS6289 Rev 4: G = 1.30–2.00 mm, H = 7.69–9.69 mm, d = 2.40–2.90 mm, θ = 30°–50° lead bend angle.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BT169G and TYN608, the X00619MA5AL2 uniquely balances ultra-low gate sensitivity (30 µA), 600 V blocking, and TO-92 form factor-making it optimal for space-constrained, low-drive, mains-voltage protection where neither smaller nor larger SCRs satisfy all three constraints.

Availability

X00619MA5AL2 is available at Aetrix Electronics and suitable for ground fault interruption, electronic ballast protection, and capacitive discharge ignition systems requiring stable component supply, consistent lead-form geometry, and tape-and-reel automation compatibility.

Supply support for X00619MA5AL2 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The X00619 belongs to ST's sensitive-gate SCR family, engineered specifically for low-energy triggering in safety-critical protection and ignition applications where minimal gate drive and robust dV/dt immunity are essential.

FAQ

What is the maximum ambient temperature for reliable operation in free-air convection?

The X00619MA5AL2 supports up to 75 °C ambient temperature in free-air convection while delivering 0.5 A average on-state current (α = 180°), based on R_th(j-a) = 150 °C/W and T_j(max) = 125 °C. Derating is required above this point per Figure 4 in DS6289 Rev 4.

Can this SCR be triggered directly by a 3.3 V microcontroller GPIO?

Yes - with appropriate series resistance. At 3.3 V and 200 µA maximum I_GT, a 10 kΩ resistor limits gate current to ~330 µA (well above worst-case trigger requirement), while keeping gate power dissipation below PG(AV) = 0.1 W. Verify layout avoids stray capacitance that could degrade dV/dt immunity.

Does the TO-92 preformed lead variant (X00619MA5AL2) have the same electrical specs as the straight-lead version?

Yes - all electrical characteristics (IT(RMS), VDRM, IGT, dV/dt, etc.) are identical across TO-92 variants (straight, preformed, tape-and-reel). Only mechanical lead geometry and packaging differ; thermal resistance values remain unchanged per DS6289 Table 4.

Is a snubber circuit required for reliable operation in inductive load switching?

A snubber is recommended for inductive loads due to the device's 40 V/µs dV/dt rating. With L-load turn-off, voltage overshoot can exceed this limit; a standard RC snubber (e.g., 100 Ω + 100 nF) across anode-cathode reduces dv/dt stress and prevents false re-triggering during commutation.