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STMicroelectronics X0402MH
- Part No.:
- X0402MH
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-251-3 Short Leads, IPAK, TO-251AA
- Datasheet:
-
X0402MH.pdf
- Description:
- 4 A SENSITIVE GATE 200 UA SCR IN
- Quantity:
- Payment:
- Shipping:
Inventory:5,972
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Product details
Overview
X0402MH from STMicroelectronics is a 4 A sensitive-gate silicon-controlled rectifier (SCR) in IPAK package, rated for 600 V repetitive peak off-state voltage (VDRM/VRRM) and 750 V non-repetitive peak (VDSM/VRSM), with gate trigger current as low as 200 µA - enabling direct drive from microcontrollers in low-power AC load switching applications such as motor start circuits in power tools.
For engineers reviewing the X0402MH datasheet, X0402MH pinout, X0402MH application, or X0402MH equivalent, key selection criteria include its 125 °C maximum junction temperature, 50 A/µs critical rate of rise of on-state current (dl/dt), 10 V/µs minimum static dV/dt immunity at 110 °C, and compatibility with through-hole PCB assembly due to its IPAK footprint.
Technical Context
The X0402MH operates as a unidirectional thyristor requiring gate-triggered latching conduction. Its sensitive gate (IGT ≤ 200 µA) allows triggering with minimal drive energy, while its 600 V VDRM rating supports universal AC mains operation (100–240 VAC). Thermal resistance Rth(j-c) is 3 °C/W, enabling 4 A RMS current handling at Tc = 114 °C.
It exhibits low on-state voltage (VTM ≤ 1.8 V at 8 A, 25 °C) and dynamic resistance (RD ≤ 100 mΩ at 125 °C), minimizing conduction losses. The device sustains 33 A non-repetitive surge current (8.3 ms) and delivers 9 A²s I²t fusing capability - critical for inrush current limiting without external snubbers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 4 A RMS on-state current at Tc = 114 °C - supports continuous 4 A resistive or inductive AC loads without forced cooling. |
| VDRM / VRRM | 600 V repetitive peak off-state voltage - ensures reliable blocking across 240 VAC mains with safety margin. |
| IGT | 200 µA max gate trigger current - enables direct interface with GPIO pins of low-power MCUs without buffer stages. |
| dl/dt | 50 A/µs critical rate of rise of on-state current - prevents false turn-on during fast current transients in motor commutation. |
| Tj max. | 125 °C maximum junction temperature - permits operation in enclosed industrial enclosures with ambient up to 85 °C. |
| Rth(j-c) | 3 °C/W junction-to-case thermal resistance - allows efficient heat transfer to heatsink via mounting tab (pin A2). |
| dV/dt | 10 V/µs minimum static dV/dt immunity at Tj = 110 °C - suppresses spurious triggering from line noise or triac crosstalk. |
Pinout & Package
IPAK package: through-hole, single-ended heatsinkable outline with integrated mounting tab (A2), halogen-free molding, lead-free plating, ECOPACK2 compliant. Dimensions per DS14067 Rev 2: L = 9.0–9.6 mm, H = 16.1 mm, e1 = 4.4–4.6 mm, weight = 0.31 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (Anode 1) | Main anode terminal | Primary current entry point; connected to AC line phase or load return path depending on circuit topology. |
| A2 (Anode 2) | Main cathode terminal & heatsink tab | Current exit path and thermally conductive mounting surface - must be electrically isolated from PCB ground unless referenced to system common. |
| G (Gate) | Trigger control input | Sensitive gate requiring ≤200 µA pulse; polarity-sensitive relative to A1; requires series resistor to limit IGM ≤1.2 A. |
Key Features
| Feature | Design Value |
|---|---|
| Sensitive gate triggering | IGT ≤ 200 µA enables direct MCU GPIO drive without level-shifting or amplification stages. |
| High dV/dt immunity | 10 V/µs minimum at 110 °C prevents false turn-on in noisy industrial AC environments. |
| Robust surge capability | 33 A non-repetitive surge (8.3 ms) supports motor startup and capacitor charging surges without derating. |
| Thermally optimized package | Rth(j-c) = 3 °C/W and metal tab (A2) allow >4 A RMS operation with passive heatsinking. |
| ECOPACK2 compliance | Halogen-free resin and lead-free plating meet RoHS and JEDEC J-STD-020 reflow requirements. |
Applications
| Motor Start Circuits | Inrush Current Limiting |
|---|---|
|
Use Scenario: Controlled startup of universal motors in corded power tools (drills, sanders) to reduce mechanical shock and contact arcing. IC Role / Device Role / Timing Role: SCR acting as zero-crossing–delayed AC switch, triggered after soft-start timing window to limit initial current spike. Use Value: 200 µA IGT allows timing control via RC network from MCU, while 33 A surge rating absorbs locked-rotor current without failure. |
Use Scenario: Limiting inrush into large electrolytic capacitors in AC/DC power supplies for industrial HMIs and PLC modules. IC Role / Device Role / Timing Role: SCR placed in series with NTC bypass path; triggered after NTC self-heats to maintain low steady-state loss. Use Value: 600 V VDRM withstands full AC peak voltage during cold start; 10 V/µs dV/dt immunity avoids false triggering from rectifier ringing. |
| Ignition Systems | Actuator Control |
|
Use Scenario: High-energy spark generation in gas furnace ignitors and commercial cooking appliance pilot lights. IC Role / Device Role / Timing Role: SCR discharging stored capacitor energy through ignition coil primary winding upon gate pulse. Use Value: 750 V VDSM rating safely handles inductive kickback from coil; 1.8 V VTM minimizes power loss during short conduction pulses. |
Use Scenario: On/off control of solenoid valves and electromagnetic clutches in HVAC dampers and packaging machinery. IC Role / Device Role / Timing Role: SCR used in half-wave or full-wave AC switching configuration to deliver precise duty-cycle–controlled actuation torque. Use Value: 4 A IT(RMS) supports 30 W+ solenoid loads; 125 °C Tj max enables operation inside sealed control cabinets with no active cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sensitive-gate SCR applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BT169G | 0.8 A IT(RMS), TO-92 package, VDRM = 400 V, IGT = 200 µA | Limited to sub-1 A loads; unsuitable for motor start or high-surge inrush limiting | Select only for low-power indicator or signal-level AC switching where size and cost outweigh current needs. |
| TIC226M | 4 A IT(RMS), TO-220 package, VDRM = 600 V, IGT = 500 µA | Higher gate drive requirement reduces MCU compatibility; larger footprint increases board area | Prefer when existing TO-220 heatsink infrastructure exists and gate drive circuitry already includes transistor buffers. |
Compared with BT169G and TIC226M, X0402MH uniquely combines 4 A current rating, 200 µA gate sensitivity, and compact IPAK thermal performance - making it optimal for space-constrained, microcontroller-driven AC load control where both surge robustness and low-drive simplicity are required.
Availability
X0402MH is available at Aetrix Electronics and suitable for motor start circuits, inrush current limiting, ignition systems, and actuator control requiring stable component supply across industrial OEM production runs and embedded design cycles.
Supply support for X0402MH 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, and microcontroller solutions for industrial, automotive, and consumer markets.
X0402MH belongs to the X04 series of sensitive-gate SCRs engineered specifically for cost-sensitive, space-constrained AC load switching in home appliances and portable power tools - emphasizing low gate drive, high surge tolerance, and through-hole manufacturability.
FAQ
What is the recommended gate resistor value for X0402MH when driven by a 3.3 V MCU GPIO?
With IGT ≤ 200 µA and VGT ≤ 0.8 V, a 12 kΩ series resistor limits gate current to ~208 µA at 3.3 V, satisfying IGM ≤ 1.2 A and ensuring reliable triggering without overshoot. Lower values (e.g., 10 kΩ) improve noise immunity but increase MCU drive burden.
Can X0402MH replace a triac in AC phase-control dimming applications?
No - X0402MH is a unidirectional SCR and conducts only during one AC half-cycle. It cannot perform bidirectional phase control like a triac. Use only in half-wave switching, DC-excitation, or applications where unidirectional conduction is acceptable (e.g., motor start, ignitors).
Is heatsinking required for 4 A continuous operation?
Yes - at 4 A RMS and Tc = 114 °C, the junction temperature reaches 125 °C with Rth(j-c) = 3 °C/W. A heatsink maintaining case temperature ≤114 °C is mandatory; PCB copper alone is insufficient for sustained 4 A loads.
Does X0402MH support snubberless operation in inductive load switching?
Yes - its 10 V/µs minimum dV/dt immunity at 110 °C and 50 A/µs dl/dt rating enable snubberless operation with moderate inductance (e.g., <50 mH solenoids) when gate is properly decoupled and layout minimizes stray inductance.
X0402MH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ECOPACK2
- Package/Case:
- TO-251-3 Short Leads, IPAK, TO-251AA
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Off State:
- 600 V
- Voltage - Gate Trigger (Vgt) (Max):
- 800 mV
- Current - Gate Trigger (Igt) (Max):
- 200 µA
- Voltage - On State (Vtm) (Max):
- 1.8 V
- Current - On State (It (AV)) (Max):
- 2.5 A
- Current - On State (It (RMS)) (Max):
- 4 A
- Current - Hold (Ih) (Max):
- 5 mA
- Current - Off State (Max):
- 5 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 30A, 33A
- SCR Type:
- Sensitive Gate
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- IPAK
X0402MH FAQ
1.How can I place an order for X0402MH through Aetrix?
Please submit a Request for Quotation (RFQ) for X0402MH on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for X0402MH reliable?
The price and inventory of X0402MH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X0402MH is usually 5 days.
3.What payment methods are accepted for X0402MH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X0402MH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X0402MH?
X0402MH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X0402MH order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for X0402MH?
For technical support, including X0402MH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X0402MH requirements.
6.How does Aetrix verify that X0402MH is sourced from the original manufacturer or authorized distributors?
All X0402MH products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that X0402MH meets industry standards.
7.What is the process for return or replacement of X0402MH?
All X0402MH units undergo pre-shipment inspection (PSI). If there is an issue with X0402MH, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The X0402MH part is unused and in its original packaging.
Return procedure for X0402MH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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