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STMicroelectronics X0402NF 1AA2
- Part No.:
- X0402NF 1AA2
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-202 No Tab
- Datasheet:
-
X0402NF 1AA2.pdf
- Description:
- SCR 800V 1.35A TO202-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,735
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Product details
Overview
X0402NF from STMicroelectronics is a sensitive-gate 4A RMS silicon-controlled rectifier (SCR) with 600V VDRM/VRRM, 200µA maximum gate trigger current (IGT), and TO-202-3 package; it operates in capacitive discharge ignition circuits, low-power overvoltage crowbar protection, and motor control for kitchen appliances where gate drive current is constrained.
For engineers reviewing the X0402NF datasheet, X0402NF pinout, X0402NF application, or X0402NF equivalent, key selection criteria include its ultra-low IGT (≤200 µA), robust dV/dt immunity (≥10 V/µs at Tj = 110°C), junction-to-lead thermal resistance (15 °C/W), and compatibility with low-energy gate drive sources in safety-critical crowbar and phase-control designs.
Technical Context
The X0402NF is a unidirectional thyristor designed for half-wave AC switching and overvoltage protection. Its sensitive gate enables reliable triggering with sub-200 µA DC or pulse currents, and it sustains 600V blocking voltage in both forward and reverse directions under repetitive conditions.
It features a latching current (IL) ≥6 mA and holding current (IH) ≤5 mA at 25°C, ensuring stable conduction after turn-on without continuous gate drive; thermal performance is characterized by Rth(j-l) = 15 °C/W, supporting 4A RMS operation at lead temperature ≤60°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 4 A - Sustains continuous 4A RMS load current at 60°C lead temperature, enabling use in 120V/230V AC motor control and crowbar circuits. |
| VDRM / VRRM | 600 V - Blocks up to 600V peak reverse/forward voltage, suitable for universal-input 230V AC systems with safety margin. |
| IGT (max) | 200 µA - Triggers reliably with minimal gate current, compatible with high-impedance microcontroller GPIO or RC timing networks. |
| dV/dt (min) | 10 V/µs - Resists false turn-on from fast-rising transients, critical in noisy industrial or appliance environments. |
| IL / IH | ≥6 mA / ≤5 mA - Ensures clean latching and stable hold without gate sustain, reducing driver complexity in crowbar applications. |
| Rth(j-l) | 15 °C/W - Enables direct PCB copper pour heatsinking; 4A operation requires ≤60°C lead temp for full rating. |
Pinout & Package
Package: TO-202-3 (plastic, 3-lead, vertical mounting). Leads are Anode (A), Cathode (K), and Gate (G), with standard pin 1–3 assignment per JEDEC TO-202 outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current entry path during conduction | Connected to AC line or positive rail; must handle full load current and surge (ITSM = 33 A, tp = 8.3 ms). |
| Cathode (K) | Main current exit path and reference for gate drive | Common return node; gate-cathode resistance (RGK) directly affects dV/dt immunity and trigger sensitivity. |
| Gate (G) | Control terminal for turn-on initiation | Receives low-energy trigger pulse; 200 µA max IGT allows direct drive from CMOS logic or optocoupler outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low gate trigger current | IGT ≤ 200 µA ensures compatibility with energy-constrained gate drivers like RC-triggered circuits or low-power optocouplers. |
| High dV/dt immunity | ≥10 V/µs at Tj = 110°C prevents spurious turn-on from EMI or switching noise in motor-drive and power-supply environments. |
| Robust surge capability | ITSM = 33 A (8.3 ms) supports single-event overvoltage clamping without failure in crowbar protection applications. |
| Thermal efficiency | Rth(j-l) = 15 °C/W allows direct copper-pad heatsinking on FR4 PCBs, eliminating need for external heatsinks at ≤4A RMS. |
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 acts as fast, low-energy switch releasing capacitor charge across primary coil; gate triggered by microsecond pulse. Use Value: 200 µA IGT enables direct triggering from simple RC networks or low-current optocouplers, minimizing component count and board space. | Use Scenario: Overvoltage shutdown in 5–24V regulated DC supplies protecting downstream ICs from transient surges. IC Role / Device Role / Timing Role: SCR placed across output rail; triggered when zener + transistor detects overvoltage, shorting supply to blow fuse. Use Value: Low IH (≤5 mA) ensures reliable latch-on once triggered, guaranteeing irreversible shutdown until power cycle. |
| Kitchen Appliance Motor Control | Phase-Controlled Lighting Dimmers |
Use Scenario: Speed regulation of universal motors in blenders, mixers, and food processors via phase-angle control. IC Role / Device Role / Timing Role: SCR switches AC mains to motor winding; gated near zero-crossing to modulate average power. Use Value: High dV/dt immunity (≥10 V/µs) prevents misfiring from commutation spikes generated by brushed motor brushes. | Use Scenario: Leading-edge dimming of incandescent or halogen lamps in residential lighting controls. IC Role / Device Role / Timing Role: SCR conducts portion of each AC half-cycle based on adjustable RC delay network timing. Use Value: 600V VDRM provides sufficient margin for 230VAC RMS (325V peak) with line surges, ensuring long-term reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sensitive-gate SCR applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| X0402MF | Same 600V rating and TO-202-3 package; identical IGT max (200 µA), but lower dV/dt immunity (10 V/µs vs. X0402NF's 10 V/µs - no difference per datasheet; both rated min 10 V/µs at Tj=110°C) | No functional distinction in crowbar or CDI use; both meet same core specs | Select X0402MF only if legacy BOM alignment or distributor stock preference applies; otherwise X0402NF is direct functional match. |
| X0405NF | Same package and 600V rating, but IGT ≤50 µA (vs. 200 µA); higher sensitivity enables even weaker gate drive sources | Better suited for ultra-low-energy triggers (e.g., piezoelectric igniters or weak optocouplers), but may be more susceptible to noise | Choose X0405NF only when gate drive is <50 µA available; otherwise X0402NF offers better noise margin with same system-level performance. |
Compared with X0402MF, X0402NF offers identical electrical and thermal specs; versus X0405NF, it trades lower gate sensitivity for improved noise immunity-making it optimal for cost-sensitive, moderate-noise environments like kitchen appliances and basic crowbar circuits.
Availability
X0402NF is available at Aetrix Electronics and suitable for capacitive discharge ignition systems, low-power overvoltage crowbar protection, and universal motor speed control requiring stable component supply and long-term industrial availability.
Supply support for X0402NF 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 discrete power portfolio, engineered specifically for robust, low-energy-triggered AC switching in cost-sensitive, safety-critical applications such as appliance control and power protection.
FAQ
What is the maximum allowable gate-cathode resistance (RGK) for reliable triggering?
The datasheet specifies RGK = 1 kΩ for all electrical tests including IGT, IL, and IH. While higher values may work, exceeding 1 kΩ risks increased IGT and reduced dV/dt immunity. For guaranteed performance across temperature and life, maintain RGK ≤ 1 kΩ using stable film resistors.
Can X0402NF be used in DC circuits?
No-it is a unidirectional SCR intended for AC or pulsating DC applications where natural current zero-crossing occurs. In pure DC, once triggered, it remains latched until current falls below IH or is forcibly interrupted; no internal turn-off mechanism exists.
Is heatsinking required for 4A RMS operation?
At IT(RMS) = 4A and Tl = 60°C, no external heatsink is needed if PCB copper pour meets recommended pad layout (per Fig. 2-1/2-2). Rth(j-l) = 15 °C/W allows thermal transfer directly to leads; ambient derating applies only above 25°C ambient with inadequate copper area.
How does junction temperature affect latching current (IL)?
Fig. 4 shows IL decreases with rising Tj: typical IL drops ~30% from 25°C to 125°C. At 125°C, IL ≈ 4.2 mA (70% of 25°C value), meaning less gate energy is needed to achieve latching at high temperature-critical for crowbar reliability under fault-heating conditions.
X0402NF 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):
- 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
X0402NF 1AA2 FAQ
1.How can I place an order for X0402NF 1AA2 through Aetrix?
Please submit a Request for Quotation (RFQ) for X0402NF 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 X0402NF 1AA2 reliable?
The price and inventory of X0402NF 1AA2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X0402NF 1AA2 is usually 5 days.
3.What payment methods are accepted for X0402NF 1AA2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X0402NF 1AA2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X0402NF 1AA2?
X0402NF 1AA2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X0402NF 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 X0402NF 1AA2?
For technical support, including X0402NF 1AA2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X0402NF 1AA2 requirements.
6.How does Aetrix verify that X0402NF 1AA2 is sourced from the original manufacturer or authorized distributors?
All X0402NF 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 X0402NF 1AA2 meets industry standards.
7.What is the process for return or replacement of X0402NF 1AA2?
All X0402NF 1AA2 units undergo pre-shipment inspection (PSI). If there is an issue with X0402NF 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 X0402NF 1AA2 part is unused and in its original packaging.
Return procedure for X0402NF 1AA2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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