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STMicroelectronics X0405NF 1AA2
- Part No.:
- X0405NF 1AA2
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-202 No Tab
- Datasheet:
-
X0405NF 1AA2.pdf
- Description:
- SCR 800V 1.35A TO202-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,762
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Product details
Overview
X0405NF from STMicroelectronics is a sensitive-gate 4A RMS silicon-controlled rectifier (SCR) with 600V VDRM/VRRM rating, 50 µA maximum gate trigger current (IGT), and TO-202-3 package. It operates as a latching power switch in low-current gate drive circuits, enabling reliable turn-on in capacitive discharge ignition systems, small appliance motor controls, and overvoltage crowbar protection for low-power AC/DC supplies.
For engineers reviewing the X0405NF datasheet, X0405NF pinout, X0405NF application, or X0405NF equivalent, key selection criteria include its ultra-low IGT (≤50 µA), robust dV/dt immunity (≥15 V/µs at Tj = 110°C), thermal resistance (Rth(j-l) = 15 °C/W), and compatibility with high-impedance gate drive sources in space-constrained industrial and consumer designs.
Technical Context
The X0405NF is a planar passivated SCR designed for gate-triggered, unidirectional conduction in AC line-switching applications. Its sensitive gate structure achieves latching with ≤50 µA IGT and ≥6 mA IL while maintaining ≥5 mA IH - enabling operation with high-impedance RC or optocoupler-based gate drivers.
It features a minimum dV/dt immunity of 15 V/µs at 110°C with 1 kΩ gate-cathode resistance, and supports non-repetitive surge currents up to 30 A (10 ms) and I²t = 4.5 A²s - critical for transient overvoltage clamping without false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 4 A - Maximum continuous RMS on-state current at 60°C lead temperature, defining steady-state power handling capability |
| VDRM / VRRM | 600 V - Peak repetitive off-state voltage, setting maximum AC line voltage tolerance before breakover |
| IGT (max) | 50 µA - Maximum gate trigger current required for reliable turn-on, enabling use with weak gate sources |
| dV/dt (min) | 15 V/µs - Minimum rate of rise of off-state voltage that avoids spurious turn-on, critical for noisy AC environments |
| IL (min) | 6 mA - Minimum latching current ensuring stable conduction after gate pulse removal |
| IH (max) | 5 mA - Maximum holding current below which device turns off naturally, defining minimum load current for sustained conduction |
| Rth(j-l) | 15 °C/W - Junction-to-leads thermal resistance, determining heat dissipation efficiency into PCB copper or heatsink |
Pinout & Package
Package: TO-202-3 (plastic, 3-lead, through-hole), with leads identified as Anode (A), Cathode (K), and Gate (G). Mounting requires FR4 PCB pad layout per STMicroelectronics mechanical data sheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current input terminal | Carries full load current into device; must be connected to AC line or positive rail side of switched load |
| Cathode (K) | Main current output terminal | Connects to load return path; forms low-impedance conduction path with Anode when triggered |
| Gate (G) | Control input terminal | Accepts low-energy trigger pulse (≤50 µA) to initiate latching; referenced to Cathode |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-sensitive gate | IGT ≤ 50 µA enables direct drive from microcontroller GPIOs via simple RC networks or optocouplers |
| High dV/dt immunity | ≥15 V/µs at 110°C prevents false triggering during fast transients in AC mains or motor commutation |
| Latching behavior | IL ≥ 6 mA and IH ≤ 5 mA ensure stable conduction under light loads and clean turn-off at zero-crossing |
| Robust surge rating | 30 A non-repetitive surge (10 ms) and 4.5 A²s I²t support crowbar protection without fuse coordination |
Applications
| Capacitive Discharge Ignition (CDI) | Kitchen Appliance Motor Control |
|---|---|
Use Scenario: High-voltage spark generation in small engine ignition systems using stored capacitor energy. IC Role / Device Role / Timing Role: SCR acts as the main discharge switch, triggered by low-energy timing pulse to release capacitor bank across ignition coil. Use Value: 50 µA IGT allows direct triggering from low-power timing ICs; 600V VDRM withstands coil flyback voltages. | Use Scenario: Speed and direction control of universal motors in blenders, food processors, and coffee grinders. IC Role / Device Role / Timing Role: Phase-angle controlled AC switching element, gated synchronously with AC zero-crossing for variable power delivery. Use Value: Low IH (≤5 mA) ensures reliable turn-off at light loads; TO-202-3 provides adequate thermal margin for intermittent duty cycles. |
| Low-Power Supply Crowbar Protection | AC Line Surge Suppression |
Use Scenario: Overvoltage shutdown in 5–24 V AC/DC adapters and wall-wart supplies during regulator failure. IC Role / Device Role / Timing Role: Crowbar device shorting secondary winding upon overvoltage detection, forcing fuse blow or upstream breaker trip. Use Value: 4.5 A²s I²t rating coordinates with standard 1–2 A slow-blow fuses; 30 A surge capacity handles worst-case fault energy. | Use Scenario: Transient voltage clamping on 120/230 VAC input stages of industrial controllers and power meters. IC Role / Device Role / Timing Role: Fast-acting shunt protector triggered by overvoltage sensing circuit to divert surge current away from downstream components. Use Value: 15 V/µs dV/dt immunity prevents misfire during fast-rising surges; 600V VDRM covers nominal line + safety margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR-based switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TIC106D | 600V VDRM, IGT = 200 µA (4× higher), TO-220 package | Requires stronger gate drive; better suited for higher-current, less space-constrained designs | Select when gate drive capability exceeds 200 µA and thermal mass permits TO-220 mounting |
| BT169G | 400V VDRM, IGT = 200 µA, TO-92 package, lower surge rating (10 A) | Lower voltage rating limits use to <120 VAC systems; unsuitable for crowbar or 230 VAC motor control | Choose only for low-voltage, low-energy switching where size is primary constraint |
Compared with TIC106D and BT169G, the X0405NF uniquely balances ultra-low gate sensitivity (50 µA), 600V blocking, and TO-202-3 thermal performance - making it optimal for compact, low-power AC switching where gate drive is limited and reliability under transient stress is essential.
Availability
X0405NF is available at Aetrix Electronics and suitable for capacitive discharge ignition systems, kitchen appliance motor controls, and low-power supply crowbar protection requiring stable component supply across production lifecycles.
Supply support for X0405NF 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-reliability SCR product line, engineered specifically for cost-sensitive, space-constrained AC power control applications demanding low gate drive, high noise immunity, and robust surge tolerance.
FAQ
What is the maximum junction temperature for continuous operation of the X0405NF?
The X0405NF has an operating junction temperature range of –40°C to +125°C. Continuous operation must maintain Tj ≤ 125°C, achievable with proper heatsinking or PCB copper area per the Rth(j-l) = 15 °C/W spec and ambient conditions defined in Figure 2-2 of the datasheet.
Can the X0405NF be directly driven by a 3.3 V microcontroller GPIO?
Yes - with appropriate series resistance. At 3.3 V and assuming VGT ≤ 0.8 V, a 51 kΩ resistor limits gate current to ~50 µA, satisfying the max IGT requirement. A 100 nF capacitor across the resistor improves noise immunity without compromising turn-on speed.
How does the X0405NF behave during AC zero-crossing in phase-control applications?
The X0405NF turns off automatically at each AC zero-crossing if load current falls below its 5 mA maximum holding current (IH). This natural commutation enables clean phase-angle control without forced commutation circuitry, provided minimum load current remains above IH during conduction intervals.
Is the X0405NF RoHS compliant and halogen-free?
Yes - the X0405NF is manufactured in accordance with STMicroelectronics' standard RoHS-compliant and halogen-free process, as confirmed in ST's official product change notifications (PCN) and material declarations dated 2018 onward for the X04 Series.
X0405NF 1AA2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-202 No Tab
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Off State:
- 800 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
X0405NF 1AA2 FAQ
1.How can I place an order for X0405NF 1AA2 through Aetrix?
Please submit a Request for Quotation (RFQ) for X0405NF 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 X0405NF 1AA2 reliable?
The price and inventory of X0405NF 1AA2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X0405NF 1AA2 is usually 5 days.
3.What payment methods are accepted for X0405NF 1AA2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X0405NF 1AA2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X0405NF 1AA2?
X0405NF 1AA2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X0405NF 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 X0405NF 1AA2?
For technical support, including X0405NF 1AA2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X0405NF 1AA2 requirements.
6.How does Aetrix verify that X0405NF 1AA2 is sourced from the original manufacturer or authorized distributors?
All X0405NF 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 X0405NF 1AA2 meets industry standards.
7.What is the process for return or replacement of X0405NF 1AA2?
All X0405NF 1AA2 units undergo pre-shipment inspection (PSI). If there is an issue with X0405NF 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 X0405NF 1AA2 part is unused and in its original packaging.
Return procedure for X0405NF 1AA2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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