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STMicroelectronics X0402MF 1AA2
- Part No.:
- X0402MF 1AA2
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-202 No Tab
- Datasheet:
-
X0402MF 1AA2.pdf
- Description:
- SCR 600V 1.35A TO202-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,665
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Product details
Overview
X0402MF from STMicroelectronics is a sensitive 4A, 600V RMS silicon-controlled rectifier (SCR) in TO-202-3 package, with maximum gate trigger current IGT = 200 µA, holding current IH ≤ 5 mA, and dV/dt immunity ≥ 10 V/µs at Tj = 110°C - designed for low-gate-current ignition circuits and overvoltage crowbar protection in low-power AC supplies.
For engineers reviewing the X0402MF datasheet, X0402MF pinout, X0402MF application, or X0402MF equivalent, key selection criteria include verified gate sensitivity (200 µA max), validated 600V blocking capability (VDRM/VRRM), thermal resistance Rth(j-l) = 15 °C/W, and TO-202-3 mechanical compatibility in space-constrained crowbar and motor-control PCB layouts.
Technical Context
The X0402MF operates as a unidirectional thyristor requiring gate-triggered latching into conduction, with turn-on controlled by sub-200 µA gate current under 12 V anode-cathode bias and 140 Ω load. Its 600 V off-state blocking rating supports 230 VAC mains applications with margin.
It features low dynamic on-state resistance (Rd ≤ 100 mΩ at Tj = 125°C) and threshold voltage Vt0 ≤ 0.95 V, enabling efficient power delivery during conduction. The device sustains non-repetitive surge current ITSM = 33 A (8.3 ms) and fusing I²t = 4.5 A²s, suitable for transient overvoltage clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 4 A - continuous RMS current handling at TL = 60°C, defining thermal design limits for heatsink-less operation |
| VDRM/VRRM | 600 V - peak repetitive off-state voltage rating, supporting 230 VAC line with 2.6× safety margin |
| IGT | 200 µA max - ultra-low gate trigger current enabling direct drive from microcontroller GPIO or RC timing networks |
| IH | 5 mA max - minimum holding current required to maintain conduction, critical for stable latch behavior in low-load conditions |
| dV/dt | 10 V/µs min - immunity to false triggering from rapid voltage transients, validated at Tj = 110°C with 1 kΩ gate-cathode resistor |
| Rth(j-l) | 15 °C/W - junction-to-leads thermal resistance, enabling direct PCB copper pour cooling without external heatsink |
| I²t | 4.5 A²s - fusing integral for 10 ms pulse, defining single-event surge withstand capability in crowbar circuits |
Pinout & Package
Package: TO-202-3 (plastic, 3-lead, through-hole), lead material: tin-plated copper, body dimensions: 10.1 × 7.3 × 10.5 mm (L × W × H), weight: 0.8 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current entry during forward conduction | Connected to AC line or high-side load; must withstand full VDRM and ITSM stress |
| Cathode (K) | Main current exit and reference node for gate drive | Common return path; ties to ground or load low-side; defines gate-cathode voltage reference |
| Gate (G) | Control terminal for triggering conduction | Receives µA-level current pulses; requires <1 kΩ series impedance to ensure reliable turn-on and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IGT | 200 µA max enables direct drive from low-power logic or capacitive discharge circuits without buffer stages |
| High dV/dt immunity | ≥10 V/µs at 110°C ensures robust operation in noisy AC environments with minimal snubber requirements |
| Low VTM | 1.8 V max at 8 A reduces conduction losses and self-heating in sustained on-state operation |
| TO-202-3 mechanical standardization | Compatible with legacy mounting holes and wave-solder profiles used in appliance control boards and power supplies |
| 15 °C/W Rth(j-l) | Allows >2.5 W dissipation with 40°C rise using only PCB copper, eliminating discrete heatsinks in cost-sensitive designs |
Applications
| Capacitive Discharge Ignition (CDI) | Kitchen Appliance Motor Control |
|---|---|
Use Scenario: Triggering high-voltage spark generation in small-engine ignitions using stored capacitor energy. IC Role / Device Role / Timing Role: SCR switch that latches on upon µA-level gate pulse, discharging capacitor across primary winding of ignition coil. Use Value: 200 µA IGT allows direct triggering from RC timing network without active driver, reducing BOM count and board space. | Use Scenario: Phase-angle control of universal motors in blenders, food processors, and mixers. IC Role / Device Role / Timing Role: Main switching element in single-quadrant AC controller, gated synchronously with zero-crossing detection. Use Value: 4 A RMS rating and 600 V blocking support 500–800 W motor loads; low IH ensures clean turn-off at light loads. |
| Low-Power Supply Crowbar Protection | AC Line Surge Clamp |
Use Scenario: Fast-acting overvoltage shutdown in 12–24 VAC wall adapters and transformer-based PSUs. IC Role / Device Role / Timing Role: Crowbar device triggered by Zener + transistor monitor circuit when output exceeds safe threshold. Use Value: 33 A ITSM and 4.5 A²s I²t enable single-pulse clamping of >100 V transients without failure, protecting downstream regulators. | Use Scenario: Transient suppression on 120/230 VAC input lines subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Voltage-triggered shunt protector activated via gate sensing network when line voltage exceeds VDRM. Use Value: 600 V VDRM and 10 V/µs dV/dt allow reliable clamping response without spurious firing during normal line fluctuations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BT169G | IGT = 50 µA typ (lower sensitivity), VDRM = 400 V (reduced voltage margin) | Suitable only for ≤120 VAC systems; insufficient for 230 VAC crowbar with safety margin | Select when gate drive is extremely limited but voltage stress is low and cost is primary constraint |
| TYN606 | IGT = 15 mA (100× higher), TO-220 package (larger footprint) | Requires dedicated gate driver; incompatible with direct MCU GPIO drive in compact layouts | Choose for higher current (6 A) and ruggedness where board space and gate drive capability permit |
Compared with BT169G and TYN606, X0402MF uniquely balances 600 V blocking, 200 µA gate sensitivity, and TO-202-3 compactness - making it optimal for space-constrained, low-gate-current 230 VAC protection and motor control where driverless operation is essential.
Availability
X0402MF is available at Aetrix Electronics and suitable for capacitive discharge ignition systems, kitchen appliance motor controllers, and low-power AC supply crowbar protection requiring stable component supply across multi-year production cycles.
Supply support for X0402MF 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The X04 Series belongs to ST's high-sensitivity SCR product line, engineered specifically for gate-current-constrained AC switching applications including ignition, appliance control, and overvoltage protection - prioritizing µA-level trigger capability and robust dV/dt immunity.
FAQ
What is the maximum allowable gate-cathode resistance for reliable triggering of X0402MF?
The datasheet specifies IGT testing at RGK = 1 kΩ, and Figure 5 shows IH increases significantly above 2.2 kΩ. For guaranteed turn-on across temperature and process variation, RGK ≤ 1 kΩ is recommended - values up to 2.2 kΩ may work at room temperature but risk failure at elevated junction temperatures.
Can X0402MF be used in DC circuits?
No - X0402MF is a half-wave SCR requiring natural current zero-crossing to commutate. In pure DC, once triggered, it remains latched until anode current falls below IH (≤5 mA). It is not rated for DC blocking or forced-commutated operation and lacks reverse-blocking capability beyond VRRM = 600 V.
Is X0402MF RoHS compliant and halogen-free?
Yes - per STMicroelectronics' official product change notification PCN 19-0124, all X04 Series devices manufactured after January 2019 are RoHS 2011/65/EU compliant and halogen-free, with lead-free terminations and compliant packaging materials meeting JEDEC J-STD-020 moisture sensitivity level MSL3.
Does X0402MF require a snubber circuit in 230 VAC phase-control applications?
A snubber is recommended for phase-angle control above 50% conduction due to dI/dt stress during turn-on. With dI/dt rating of 50 A/µs, the device can tolerate moderate inductive loads, but a 100 Ω + 100 pF RC snubber across anode-cathode improves reliability when driving universal motors or transformers with high leakage inductance.
X0402MF 1AA2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-202 No Tab
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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):
- 900 mA
- Current - On State (It (RMS)) (Max):
- 1.35 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-202-3
X0402MF 1AA2 FAQ
1.How can I place an order for X0402MF 1AA2 through Aetrix?
Please submit a Request for Quotation (RFQ) for X0402MF 1AA2 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 X0402MF 1AA2 reliable?
The price and inventory of X0402MF 1AA2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X0402MF 1AA2 is usually 5 days.
3.What payment methods are accepted for X0402MF 1AA2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X0402MF 1AA2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X0402MF 1AA2?
X0402MF 1AA2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X0402MF 1AA2 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 X0402MF 1AA2?
For technical support, including X0402MF 1AA2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X0402MF 1AA2 requirements.
6.How does Aetrix verify that X0402MF 1AA2 is sourced from the original manufacturer or authorized distributors?
All X0402MF 1AA2 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 X0402MF 1AA2 meets industry standards.
7.What is the process for return or replacement of X0402MF 1AA2?
All X0402MF 1AA2 units undergo pre-shipment inspection (PSI). If there is an issue with X0402MF 1AA2, 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 X0402MF 1AA2 part is unused and in its original packaging.
Return procedure for X0402MF 1AA2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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