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STMicroelectronics X0402MB
- Part No.:
- X0402MB
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
X0402MB.pdf
- Description:
- 4 A SENSITIVE GATE 200 ?A SCR IN
- Quantity:
- Payment:
- Shipping:
Inventory:9,805
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Product details
Overview
X0402MB from STMicroelectronics is a 4 A sensitive gate SCR in DPAK surface-mount package, rated for 600 V repetitive off-state voltage and 750 V non-repetitive peak voltage, with gate trigger current as low as 200 µA and maximum junction temperature of 125 °C; it switches AC loads in home appliance motor controls and industrial inrush limiting circuits.
For engineers reviewing the X0402MB datasheet, X0402MB pinout, X0402MB application, or X0402MB equivalent, this part supports compact SMD designs requiring low-trigger-threshold thyristor switching, thermal robustness up to 125 °C, and compliance with ECOPACK2 environmental standards.
Technical Context
This SCR operates in phase-controlled AC switching mode with bidirectional conduction capability between anode (A2) and cathode (A1), triggered by a low-energy gate pulse. Its 200 µA IGT enables direct drive from microcontroller GPIOs without external amplification.
The device features 10 V/µs minimum static dV/dt immunity at 110 °C and 50 A/µs critical rate of rise of on-state current, ensuring reliable turn-on under noisy line conditions and fast load transients in motor and heater control applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 4 A - sustains continuous RMS load current up to 4 A at case temperature ≤114 °C |
| VDRM / VRRM | 600 V - blocks 600 V repetitive AC line voltage peaks in 50/60 Hz systems |
| VDSM / VRSM | 750 V - withstands 750 V transient surges for up to 10 ms during startup or fault events |
| IGT | 200 µA max - triggers reliably with microcontroller-level gate drive, eliminating need for buffer transistors |
| Tj max | 125 °C - supports operation in thermally constrained SMD layouts without derating below ambient +85 °C |
| Rth(j-c) | 3 °C/W max - enables efficient heat transfer to PCB copper pour or heatsink via exposed tab |
| dV/dt (static) | 10 V/µs min - resists false triggering from line noise or inductive kickback in unfiltered AC circuits |
Pinout & Package
DPAK (TO-252) surface-mount package with exposed metal tab for thermal dissipation and mechanical anchoring; three terminals: Anode (A2), Cathode (A1), and Gate (G).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A2 | Anode | Main current terminal connected to AC line or high-side load; bidirectional conduction path with A1 |
| A1 | Cathode | Main current terminal referenced to neutral or return path; forms conduction loop with A2 when triggered |
| G | Gate | Control input that initiates latching conduction when ≥200 µA pulse applied relative to A1 |
Key Features
| Feature | Design Value |
|---|---|
| Sensitive gate trigger | 200 µA IGT enables direct MCU GPIO drive without external amplification |
| High surge tolerance | 33 A non-repetitive surge (8.3 ms) supports motor startup and lamp cold-inrush events |
| Thermal performance | 3 °C/W junction-to-case resistance allows >3 W power dissipation with minimal PCB copper area |
| ECOPACK2 compliance | Halogen-free molding compound and lead-free plating meet RoHS and REACH requirements |
Applications
| Home Appliance Motor Control | Industrial Inrush Current Limiting |
|---|---|
Use Scenario: Phase-angle controlled speed regulation of universal motors in vacuum cleaners and power tools. IC Role / Device Role / Timing Role: Bidirectional AC switch triggered synchronously with zero-crossing detection to modulate RMS voltage. Use Value: Enables compact SMD implementation with 200 µA gate sensitivity, reducing BOM count versus discrete driver + triac solutions. | Use Scenario: Soft-start circuit for transformer-based power supplies in test equipment and PLC modules. IC Role / Device Role / Timing Role: SCR placed in series with primary winding, gated after initial surge to limit inrush current to <10 A. Use Value: 750 V VRSM rating withstands transformer flyback spikes; 125 °C Tj rating ensures reliability during repeated hot-plug cycles. |
| Ignition Systems | Actuator Drive Interface |
Use Scenario: High-voltage spark generation in gas furnace ignitors and automotive pre-heaters. IC Role / Device Role / Timing Role: SCR acts as high-current switch discharging capacitor bank into ignition coil primary winding. Use Value: 50 A/µs dl/dt rating supports rapid current rise for sharp spark edge; 33 A surge capacity handles repeated discharge pulses. | Use Scenario: Solid-state replacement for electromechanical relays driving solenoid valves and pneumatic actuators. IC Role / Device Role / Timing Role: AC load switch interfacing microcontroller logic to 24–240 VAC actuator coils. Use Value: DPAK footprint reduces board space vs. through-hole SCRs; 600 V VDRM covers global mains voltage ranges including 230 VAC ±10%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sensitive-gate SCR applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STX0402M | Same die, TO-92 through-hole package; no exposed thermal tab | Limited to lower-power applications due to higher Rth(j-a) ≈ 120 °C/W | Select when manual assembly or legacy through-hole layout required |
| Littelfuse S4006L | 4 A/600 V SCR, IGT = 5 mA - requires gate buffer stage | Not suitable for direct MCU drive; needs additional transistor or optocoupler | Select only if existing design uses higher IGT SCRs and gate drive infrastructure is already present |
Compared with STX0402M and S4006L, X0402MB uniquely combines SMD compatibility, ultra-low 200 µA gate drive, and 3 °C/W thermal resistance-enabling smaller PCB area, lower system power consumption, and higher reliability in thermally dense industrial modules.
Availability
X0402MB is available at Aetrix Electronics and suitable for home appliance motor control, industrial inrush current limiting, and ignition systems requiring stable component supply across multi-year production cycles.
Supply support for X0402MB 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.
X0402MB belongs to the X04 series of sensitive-gate SCRs engineered specifically for compact, energy-efficient AC switching in cost-sensitive SMD applications such as white goods and power tools.
FAQ
What is the recommended gate resistor value for driving X0402MB from a 3.3 V MCU GPIO?
For reliable triggering at 25 °C, use RGK = 1 kΩ to deliver ≥200 µA while limiting gate current to <1.2 A peak. At elevated temperatures, reduce RGK to 680 Ω to maintain margin against IGT drift. Avoid values below 470 Ω to prevent exceeding PGM = 0.5 W during short pulses.
Can X0402MB replace a triac in phase-control dimming applications?
No - X0402MB is a unidirectional SCR, not a bidirectional triac. It conducts only from A2 to A1 when triggered; for full-wave AC dimming, a triac or back-to-back SCR configuration is required. Use only in half-wave or DC-biased AC applications.
How much PCB copper area is needed to achieve the 3 °C/W Rth(j-c) spec?
To realize the specified 3 °C/W junction-to-case thermal resistance, the DPAK tab must be soldered to ≥2 cm² of 2-oz copper with ≥4 thermal vias (0.3 mm diameter) connecting to inner or bottom-layer planes. Smaller areas increase Rth(j-a) significantly, requiring derating per Figure 12.
Is X0402MB suitable for 230 VAC mains switching without snubber networks?
It can operate without a snubber in resistive loads, but inductive loads (e.g., motors, transformers) require an RC snubber across A2–A1 to suppress dV/dt transients exceeding 10 V/µs. The device's 10 V/µs static dV/dt rating is insufficient for unclamped inductive turn-off spikes.
X0402MB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ECOPACK2
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- DPAK
X0402MB FAQ
1.How can I place an order for X0402MB through Aetrix?
Please submit a Request for Quotation (RFQ) for X0402MB 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 X0402MB reliable?
The price and inventory of X0402MB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X0402MB is usually 5 days.
3.What payment methods are accepted for X0402MB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X0402MB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X0402MB?
X0402MB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X0402MB 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 X0402MB?
For technical support, including X0402MB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X0402MB requirements.
6.How does Aetrix verify that X0402MB is sourced from the original manufacturer or authorized distributors?
All X0402MB 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 X0402MB meets industry standards.
7.What is the process for return or replacement of X0402MB?
All X0402MB units undergo pre-shipment inspection (PSI). If there is an issue with X0402MB, 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 X0402MB part is unused and in its original packaging.
Return procedure for X0402MB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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