STMicroelectronics P0111MA2AL3

Overview

P0111MA2AL3 from STMicroelectronics is a sensitive-gate silicon-controlled rectifier (SCR) rated for 600 V repetitive peak off-state voltage (VRRM/VDRM) and 0.8 A RMS on-state current (IT(RMS)), with gate trigger current (IGT) range of 4–25 µA. It operates in TO-92 package, enabling use in space-constrained pilot circuits where low gate drive capability exists - such as ground fault circuit interrupters (GFCIs), solid-state relay control stages, and standby power supply enable paths.

For engineers reviewing the P0111MA2AL3 datasheet, P0111MA2AL3 pinout, P0111MA2AL3 application, or P0111MA2AL3 equivalent, key selection criteria include its ultra-low IGT threshold, high dV/dt immunity (≥80 V/µs at Tj = 125 °C), robust surge rating (7 A @ 10 ms), and thermal resistance (Rth(j-a) = 150 °C/W on FR4), critical for reliable latching in low-power control interfaces.

Technical Context

This SCR employs planar passivated junction technology to achieve stable triggering under low gate current and high transient immunity. Its gate-cathode structure supports operation with <25 µA IGT while maintaining ≥80 V/µs dV/dt at 125 °C junction temperature and 67% VDRM.

Designed for DC or phase-controlled AC switching in sub-watt gate-drive environments, it features a dynamic resistance (Rd) ≤600 mΩ and threshold voltage (Vt0) ≤0.95 V at 125 °C, ensuring predictable conduction onset and minimal on-state loss in thermally constrained designs.

Key Specifications

Pinout & Package

Supplied in TO-92 through-hole package (JEDEC TO-92 variant), with standardized three-terminal configuration: Anode (A), Cathode (K), and Gate (G). Leads are tinned and compliant with UL94 V0 epoxy molding compound.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar sensitive-gate SCR applications.

Compared with TS118-600 and BT169G, P0111MA2AL3 offers balanced sensitivity (4–25 µA), 600 V rating, and proven dV/dt immunity - making it optimal for globally deployed GFCIs and dual-voltage SSRs requiring consistent trigger behavior across temperature and noise conditions.

Availability

P0111MA2AL3 is available at Aetrix Electronics and suitable for ground fault protection, solid-state relay control, and low-power alarm system design requiring stable component supply, long-lifecycle support, and consistent parametric performance across manufacturing lots.

Supply support for P0111MA2AL3 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, MCU, and sensor solutions for industrial, automotive, and consumer markets.

P0111MA2AL3 belongs to the P011xx sensitive SCR product line, engineered specifically for ultra-low-gate-drive switching in safety-critical and energy-efficient control applications - including circuit protection, pilot-stage isolation, and battery-operated alarm systems.

FAQ

What is the maximum allowable gate-cathode resistance (RGK) for reliable triggering?

The datasheet specifies RGK = 1 kΩ as the test condition for IGT, IH, and dV/dt characterization. While higher values may work, exceeding 1 kΩ risks marginal triggering due to reduced effective gate current and degraded dV/dt immunity - especially at elevated temperature. For production designs, RGK ≤1 kΩ is recommended to ensure margin across voltage, temperature, and unit-to-unit variation.

Can P0111MA2AL3 be used in AC phase-control dimmers?

No - P0111MA2AL3 is a unidirectional SCR intended for DC or half-wave AC switching where natural commutation occurs. It lacks the bidirectional conduction required for standard leading-edge AC dimming. For full-wave phase control, a TRIAC (e.g., BTA16 series) or back-to-back SCR configuration is required instead.

Does this device require a snubber circuit in typical GFCI applications?

A snubber is not mandatory for basic GFCI operation due to the device's 80 V/µs dV/dt rating and 600 V blocking capability. However, if the load includes inductive components (e.g., relay coils or transformer primaries), an RC snubber (e.g., 100 Ω + 100 pF) across A–K is recommended to suppress turn-off voltage spikes and prevent false re-triggering.

What is the meaning of "2AL3" in the part number P0111MA2AL3?

"2AL3" denotes the packaging configuration: "2" indicates Ammopack tape format, "A" signifies TO-92 package, and "L3" specifies 2000 units per reel. This differs from "1AA3" (bulk bag, 2500 pcs) and "5AL3" (13-inch tape-and-reel, 2000 pcs), reflecting ST's standardized ordering code scheme for sensitivity, voltage, package, and packing mode.