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STMicroelectronics X0405MF 1AA2
- Part No.:
- X0405MF 1AA2
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-202 No Tab
- Datasheet:
-
X0405MF 1AA2.pdf
- Description:
- SCR 600V 1.35A TO202-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,890
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Product details
Overview
X0405MF 1AA2 from STMicroelectronics is a sensitive 4A, 600V RMS silicon-controlled rectifier (SCR) in TO-202-3 package, featuring ultra-low gate trigger current (IGT ≤ 50 µA), low on-state voltage (VTM ≤ 1.8 V), and high dV/dt immunity (≥15 V/µs). It is designed for capacitive discharge ignition systems, low-power overvoltage crowbar protection, and motor control in battery-powered kitchen appliances where gate drive current is severely constrained.
For engineers reviewing the X0405MF 1AA2 datasheet, X0405MF 1AA2 pinout, X0405MF 1AA2 application, or X0405MF 1AA2 equivalent, key selection criteria include verified IGT ≤ 50 µA at 12 V, VDRM = 600 V, IT(RMS) = 4 A with Tl = 60°C, thermal resistance Rth(j-l) = 15 °C/W, and TO-202-3 mechanical compatibility with standard leaded PCB footprints.
Technical Context
The X0405MF operates as a unidirectional thyristor requiring only minimal gate charge to latch-enabling reliable triggering from weak signal sources such as RC timing networks or microcontroller GPIOs with series resistors ≥1 kΩ. Its low Vt0 (≤0.95 V) and Rd (≤100 mΩ) minimize conduction loss at 4 A RMS, while dI/dt rating of 50 A/µs ensures robust turn-on under inductive loads.
Designed for crowbar and phase-control applications, it sustains repetitive surges up to 30 A (tp = 10 ms) with I²t = 4.5 A²s, and maintains stable latching (IL ≥ 6 mA) and holding (IH ≤ 5 mA) across –40°C to +125°C junction temperature, supported by gate-cathode resistance tolerance up to 1 kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 4 A - Sustains continuous 4 A RMS load current at lead temperature ≤60°C, suitable for mains-frequency motor control and crowbar circuits |
| VDRM / VRRM | 600 V - Blocks 600 V peak reverse/forward off-state voltage, compatible with 230 VAC line applications with safety margin |
| IGT (max) | 50 µA - Triggers reliably with ≤50 µA DC gate current at 12 V, enabling direct drive from low-power logic or RC networks |
| dV/dt (min) | 15 V/µs - Immune to false triggering from rapid voltage transients up to 15 V/ns, critical for noisy industrial environments |
| Rth(j-l) | 15 °C/W - Junction-to-leads thermal resistance enables 4 A operation without heatsink when leads are used as heat paths |
| VTM (max) | 1.8 V - Maximum on-state voltage drop at 8 A pulse, limiting conduction loss to <14.4 W peak during surge |
| IL / IH | ≥6 mA / ≤5 mA - Latching current exceeds holding current, ensuring stable conduction after gate removal in crowbar mode |
Pinout & Package
TO-202-3 plastic package with 3 leads: Anode (A), Cathode (K), Gate (G). Leads are formed for through-hole mounting; case is electrically isolated from all terminals. Thermal performance relies on copper land area and lead soldering quality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current entry terminal | Carries full load current into device; must be routed with ≥0.8 mm trace width for 4 A RMS |
| Cathode (K) | Main current exit terminal | Connected to system ground or return path; serves as reference for gate drive and thermal sinking |
| Gate (G) | Control input for turn-on | Receives low-energy trigger pulse; requires ≤50 µA to initiate conduction, compatible with open-drain MCU outputs |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IGT | ≤50 µA max - Enables direct triggering from microcontroller GPIOs without external amplification |
| High dV/dt immunity | ≥15 V/µs - Prevents spurious turn-on in EMI-heavy environments like motor drives and SMPS crowbars |
| Low VTM & Rd | ≤1.8 V / ≤100 mΩ - Reduces power dissipation to <7.2 W average at 4 A RMS, easing thermal design |
| Robust surge rating | 30 A @ 10 ms - Supports single-event overvoltage clamping without degradation in low-power supplies |
| Wide temperature range | –40°C to +125°C operating - Validated for use in sealed appliance enclosures with internal self-heating |
Applications
| Capacitive Discharge Ignition (CDI) | Low-Power Crowbar Protection |
|---|---|
Use Scenario: Triggering high-voltage spark generation in small engine ignition systems using stored capacitor energy. IC Role / Device Role / Timing Role: SCR switch that discharges primary capacitor into ignition coil upon precise gate pulse. Use Value: 50 µA IGT allows direct triggering from timing ICs or microcontrollers without driver stages, reducing BOM count and board space. | Use Scenario: Overvoltage shutdown in 12 V/24 V regulated DC supplies protecting downstream logic and sensors. IC Role / Device Role / Timing Role: Crowbar element that short-circuits supply rail when voltage exceeds safe threshold. Use Value: Fast, low-energy turn-on ensures sub-microsecond response to overvoltage events, limiting fault energy to <4.5 A²s before fuse interruption. |
| Kitchen Appliance Motor Control | Phase-Controlled Lighting Dimmers |
Use Scenario: Speed regulation of universal motors in blenders, mixers, and food processors powered from AC mains. IC Role / Device Role / Timing Role: Half-wave or full-wave phase-controlled switch modulating power delivery to motor windings. Use Value: Stable latching (IL ≥6 mA) and low VTM ensure consistent torque at low speeds without gate retriggering or conduction dropout. | Use Scenario: Leading-edge dimming of incandescent and halogen lamps in residential lighting controls. IC Role / Device Role / Timing Role: AC line switch synchronizing conduction angle with zero-crossing detection circuitry. Use Value: 15 V/µs dV/dt immunity prevents misfiring due to lamp filament inrush transients, ensuring smooth dimming down to 5% brightness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BT169G | IT(RMS) = 0.8 A, IGT ≤ 200 µA, VDRM = 400 V | Lower current/voltage rating; unsuitable for 4 A crowbar or motor loads | Select only for sub-1 A signal-level switching where gate sensitivity is secondary |
| TIC226M | IT(RMS) = 4 A, IGT ≤ 200 µA, VDRM = 600 V, TO-220 package | Larger footprint, higher thermal mass; requires heatsink above 2 A continuous | Prefer when higher surge margin or manual assembly tolerance is needed, not for space-constrained PCBs |
Compared with BT169G and TIC226M, X0405MF 1AA2 uniquely delivers 4 A capability with ≤50 µA gate sensitivity in TO-202-3-enabling compact, low-power-triggered designs where both current capacity and drive simplicity are mandatory.
Availability
X0405MF 1AA2 is available at Aetrix Electronics and suitable for capacitive discharge ignition systems, low-power crowbar protection circuits, and kitchen appliance motor control requiring stable component supply across production lifecycles.
Supply support for X0405MF 1AA2 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, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
The X04 Series belongs to ST's high-sensitivity SCR product line, engineered specifically for energy-efficient, low-gate-drive switching in cost-sensitive, thermally constrained applications like white goods and portable power tools.
FAQ
What is the maximum gate-cathode resistance allowed for reliable triggering?
The X0405MF 1AA2 maintains guaranteed turn-on with RGK ≤ 1 kΩ across its full operating temperature range (–40°C to +125°C), as confirmed by Fig. 5 and Fig. 6 in the official datasheet. At 25°C, triggering remains functional up to 2.2 kΩ, but design margins require adherence to the 1 kΩ limit for production robustness.
Can X0405MF 1AA2 replace a standard 4A SCR like TIC226M in existing designs?
Yes, but only if gate drive capability supports ≤50 µA IGT and PCB layout accommodates TO-202-3 instead of TO-220. The lower gate current requirement may eliminate external driver transistors, yet thermal design must be re-evaluated since Rth(j-l) is 15 °C/W versus ~3 °C/W for TO-220 packages with heatsinks.
Is X0405MF 1AA2 suitable for 230 VAC phase-control dimming?
Yes-its 600 V VDRM provides adequate margin for 230 VAC mains (peak ≈ 325 V), and its 15 V/µs dV/dt immunity prevents false triggering from lamp filament inrush. However, zero-crossing synchronization and snubber design remain essential to manage commutation stress and EMI.
Does X0405MF 1AA2 require a gate resistor in series with the trigger source?
A gate resistor is recommended to limit peak IGM (1.2 A max) and suppress ringing. For typical 12 V DC trigger sources, a 220 Ω resistor limits peak gate current to ~54 mA, well below the 1.2 A absolute maximum, while preserving fast turn-on speed and noise immunity.
X0405MF 1AA2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-202 No Tab
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Off State:
- 600 V
- Voltage - Gate Trigger (Vgt) (Max):
- 800 mV
- Current - Gate Trigger (Igt) (Max):
- 50 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
X0405MF 1AA2 FAQ
1.How can I place an order for X0405MF 1AA2 through Aetrix?
Please submit a Request for Quotation (RFQ) for X0405MF 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 X0405MF 1AA2 reliable?
The price and inventory of X0405MF 1AA2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X0405MF 1AA2 is usually 5 days.
3.What payment methods are accepted for X0405MF 1AA2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X0405MF 1AA2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X0405MF 1AA2?
X0405MF 1AA2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X0405MF 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 X0405MF 1AA2?
For technical support, including X0405MF 1AA2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X0405MF 1AA2 requirements.
6.How does Aetrix verify that X0405MF 1AA2 is sourced from the original manufacturer or authorized distributors?
All X0405MF 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 X0405MF 1AA2 meets industry standards.
7.What is the process for return or replacement of X0405MF 1AA2?
All X0405MF 1AA2 units undergo pre-shipment inspection (PSI). If there is an issue with X0405MF 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 X0405MF 1AA2 part is unused and in its original packaging.
Return procedure for X0405MF 1AA2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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