X0402MF STMicroelectronics SCR (Transistor Outline, Vertical) In Stock
STMicroelectronics X0402MF is a sensitive-gate SCR thyristor rated 4 A RMS and 600 V to 800 V VDRM with an ultra-low gate trigger current of 200 µA maximum in a TO-92 3-pin package for compact AC power control circuits. Its sensitive gate enables direct triggering from microcontroller GPIO or opto-coupler outputs without additional drive circuitry. Available from stock worldwide for AC switch and motor-control applications.
- Manufacturer
- STMicroelectronics
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- OBSOLETE
- Datasheet
- X0402MF Datasheet PDF
- Category
- SCR
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Sensitive gate SCR with maximum gate trigger current of only 200 µA and 0.8 V trigger voltage, enabling direct triac/SCR control from 3.3 V or 5 V GPIO outputs and opto-coupler phototransistors without gate amplifier circuits
- 4 A RMS on-state current rating with VDRM up to 800 V covers 90 V to 240 V AC mains load switching for lamp dimmers, heater controls, and small motor phase-control circuits
- TO-92 vertical package delivers a single-device AC switch solution in a through-hole footprint smaller than 5 mm diameter, reducing PCB space requirements for simple 1-channel AC power control
Applications
The X0402MF is used in AC mains power control circuits such as light dimmers, heating element phase controllers, small fan and pump speed regulators, and soft-start circuits for single-phase motors rated up to 4 A at 230 V AC. Its sensitive gate characteristic makes it directly compatible with opto-coupler output stages and low-current microcontroller GPIO lines, simplifying isolated AC switch designs in white goods appliances, HVAC controls, and smart home power modules.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | SENSITIVE GATE |
| Configuration | SINGLE |
| Critical Rate of Rise of Off-State Voltage-Min | 30V/us |
| DC Gate Trigger Current-Max | 0.2mA |
| DC Gate Trigger Voltage-Max | 0.8V |
| Holding Current-Max | 5mA |
| JESD-30 Code | R-PSIP-T3 |
| JESD-609 Code | e3 |
| Leakage Current-Max | 0.2mA |
| Non-Repetitive Pk On-state Cur | 27A |
| Number of Elements | 1 |
| On-state Current-Max | 4000A |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| RMS On-state Current-Max | 1.35A |
| Repetitive Peak Off-state Voltage | 600V |
| Repetitive Peak Reverse Voltage | 600V |
| Surface Mount | NO |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Position | SINGLE |
| Trigger Device Type | SCR |
| Package | Transistor Outline, Vertical |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8541.30.00.80 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for X0402MF:
Frequently Asked Questions
What gate trigger current and voltage does the X0402MF require to switch on, and which control circuits can drive it directly?
The X0402MF requires a maximum gate trigger current of 200 µA at a gate trigger voltage below 0.8 V, which falls within the output current capability of standard opto-coupler phototransistors rated at 1 mA and 3.3 V CMOS GPIO output stages. This sensitive-gate specification eliminates the need for a transistor gate-drive amplifier between a microcontroller and the SCR, reducing BOM count by 2 components per channel in AC load-switching circuits.
What is the maximum AC load current and voltage rating of the X0402MF for 230 V mains applications?
The X0402MF is rated for 4 A RMS on-state current and a peak off-state voltage (VDRM) of 600 V to 800 V depending on the variant, providing a safe margin above the 325 V peak of a 230 V AC mains supply. At 4 A RMS this covers resistive loads up to 920 W at 230 V, including incandescent lamp dimmers, 800 W fan heaters, and small single-phase pump motors in household appliances.
How does the 30 V/µs minimum dV/dt rating of the X0402MF affect circuit design for inductive loads?
The 30 V/µs minimum critical rate of voltage rise (dV/dt) means the X0402MF can withstand voltage transients rising no faster than 30 V/µs before false triggering. For inductive loads like motor windings that generate 100 V/µs turn-off voltage spikes, an RC snubber network (typically 100 Ω in series with 10 nF) must be connected across the SCR to limit dV/dt below 30 V/µs and prevent inadvertent re-triggering during AC commutation cycles.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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