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STMicroelectronics X0202MA 1BA2
,TO-226_straightlead.jpg)
- Part No.:
- X0202MA 1BA2
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
X0202MA 1BA2.pdf
- Description:
- SCR 600V 1.25A TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,644
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Product details
Overview
X0202MA 1BA2 from STMicroelectronics is a sensitive-gate silicon-controlled rectifier (SCR) rated for 1.25 A RMS on-state current and 600 V repetitive peak off-state voltage, with gate trigger current of 50–200 µA. It operates in TO-92 package and serves as a low-power, high-immunity latching switch in crowbar protection, GFCI trip circuits, and capacitive ignition systems where minimal gate drive is available.
For engineers reviewing the X0202MA 1BA2 datasheet, X0202MA 1BA2 pinout, X0202MA 1BA2 application, or X0202MA 1BA2 equivalent, this part delivers verified dV/dt immunity (≥10 V/µs), low forward voltage drop (≤1.45 V at 2.5 A), and robust surge capability (22.5 A @ 60 Hz, 10 ms) - critical for overvoltage clamping and fail-safe power control in constrained gate-drive topologies.
Technical Context
The X0202MA 1BA2 is a unidirectional SCR optimized for low IGT sensitivity and high dV/dt immunity. Its triggering threshold is guaranteed down to 50 µA (Q1 quadrant), with holding current ≤5 mA and latching current ≤6 mA - enabling reliable turn-on with weak gate signals while resisting false triggering from transient noise.
Thermal performance is defined by Rth(j-l) = 60 °C/W (junction-to-lead, TO-92), supporting continuous operation up to Tj = 125 °C. The device exhibits stable on-state characteristics across temperature, with VT ≤0.9 V at 125 °C and IDRM ≤500 µA at same junction temperature - ensuring predictable conduction and leakage behavior in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 1.25 A - maximum continuous RMS load current without thermal derating at TL = 63 °C |
| VDRM / VRRM | 600 V - peak repetitive blocking voltage in forward/reverse direction, defining safe operating voltage margin |
| IGT (Q1) | 50–200 µA - gate current range required to reliably trigger conduction, enabling use with high-impedance drivers |
| dV/dt (min) | 10 V/µs - minimum rate of voltage rise the device withstands without spurious turn-on, critical for noisy AC lines |
| VT (max) | 1.45 V @ 2.5 A, 25 °C - forward voltage drop determining conduction loss and self-heating under load |
| IH (max) | 5 mA - maximum holding current needed to sustain conduction after gate signal removal |
| ITSM | 22.5 A @ 60 Hz, 10 ms - non-repetitive surge current rating for short-circuit or inrush protection events |
Pinout & Package
Supplied in TO-92 package (3-lead, axial leaded plastic case), with leads identified as Anode (A), Cathode (K), and Gate (G). Thermal resistance junction-to-lead is 60 °C/W, enabling direct PCB mounting without heatsink for ≤0.8 A average current.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current entry terminal during conduction | Carries full load current when triggered; must be connected to positive side of AC/DC source |
| Cathode (K) | Main current exit terminal during conduction | Reference node for gate drive; ties to load return or ground in most crowbar/GFCI configurations |
| Gate (G) | Control input for initiating conduction | Accepts low-current pulse (≥50 µA) to latch device; polarity-sensitive (Q1 quadrant only) |
Key Features
| Feature | Design Value |
|---|---|
| Sensitive gate triggering | Guaranteed turn-on with ≤200 µA gate current enables interface with microcontroller GPIO or optocoupler outputs |
| High dV/dt immunity | ≥10 V/µs at 110 °C ensures noise-free operation in switching power supply feedback loops and motor phase lines |
| Low on-state voltage | VT ≤1.45 V reduces conduction losses and thermal stress in compact GFCI or ignition modules |
| Robust surge rating | 22.5 A non-repetitive surge supports single-event overvoltage clamping without degradation |
| Wide temperature range | Operates from –40 °C to +125 °C junction temperature, validated for industrial and automotive under-hood environments |
Applications
| Ground Fault Circuit Interrupter (GFCI) | Overvoltage Crowbar Protection |
|---|---|
Use Scenario: Detects differential current imbalance >5 mA between line and neutral to trip mains power within 25 ms. IC Role / Device Role / Timing Role: Latching crowbar switch that shorts AC line upon fault detection signal from comparator circuit. Use Value: Low IGT (50 µA) allows direct drive from op-amp output; fast dV/dt immunity prevents nuisance tripping during EMI transients. |
Use Scenario: Protects downstream DC-DC converters from input overvoltage events exceeding 600 V peak. IC Role / Device Role / Timing Role: Voltage-triggered shunt device that latches into conduction when Zener-clamped gate voltage exceeds threshold. Use Value: 600 V VDRM matches standard AC line peaks; 22.5 A ITSM handles capacitor discharge energy without failure. |
| Capacitive Discharge Ignition (CDI) | AC Motor Phase Control |
Use Scenario: Triggers spark plug firing by discharging stored capacitor energy through primary coil at precise crank angle. IC Role / Device Role / Timing Role: High-speed gate-controlled switch synchronizing capacitor dump with engine timing signal. Use Value: Fast turn-on (sub-µs) and low VT minimize energy loss in ignition coil primary path, maximizing spark energy. |
Use Scenario: Controls speed/torque of universal motors in power tools via phase-angle modulation of AC supply. IC Role / Device Role / Timing Role: Leading-edge triggered SCR regulating power delivery per half-cycle based on zero-crossing synchronized gate pulse. Use Value: TO-92 package allows compact PCB layout; 1.25 A IT(RMS) supports continuous 500–700 W motor loads with natural convection cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STX0202NA 1BA2 | 800 V VDRM/VRRM vs. 600 V; identical IGT, IT(RMS), and TO-92 package | Used where higher line-voltage margin is required (e.g., 277 VAC lighting systems or industrial 400 VAC inputs) | Select when system peak voltage exceeds 600 V but gate drive and thermal constraints remain unchanged |
| Littelfuse S4006L | 600 V VDRM, 4 A IT(RMS), 50 mA IGT - higher current rating but less sensitive gate | Preferred in high-power motor controls where gate drive strength is not limiting and higher surge tolerance is needed | Choose only if gate driver can supply ≥50 mA and board space allows larger TO-220 package |
Compared with X0202MA 1BA2, STX0202NA offers higher voltage headroom without changing footprint or gate drive requirements, while S4006L trades sensitivity for higher current capacity and requires stronger gate drive - making X0202MA optimal for space-constrained, low-power, noise-prone GFCI and crowbar designs.
Availability
X0202MA 1BA2 is available at Aetrix Electronics and suitable for ground fault interruption, overvoltage crowbar protection, and capacitive ignition circuits requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for X0202MA 1BA2 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, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.
The X02 series is ST's dedicated family of sensitive-gate SCRs engineered for reliability in safety-critical, low-power AC control - specifically targeting GFCI, surge protection, and ignition applications where gate drive resources are limited.
FAQ
What is the maximum gate-cathode resistance allowed for reliable triggering?
The X0202MA 1BA2 requires gate current ≥50 µA for guaranteed turn-on. With VGT ≤0.8 V and typical gate-source voltage of 12 V in crowbar circuits, RGK must be ≤224 kΩ to deliver minimum IGT. However, dV/dt immunity degrades above 10 kΩ; ST recommends RGK ≤1 kΩ for noise immunity in GFCI designs.
Can this SCR be used in bidirectional AC switching applications?
No - X0202MA 1BA2 is a unidirectional SCR and conducts only from anode to cathode. For bidirectional AC control (e.g., light dimmers), a TRIAC such as ST's BT136 or BTA16 is required. This part is designed exclusively for single-quadrant latching in crowbar, GFCI, and CDI topologies.
What is the thermal derating curve for continuous operation at elevated ambient temperatures?
Per DS2122 Figure 3, average on-state current drops linearly from 0.8 A at 25 °C ambient to 0 A at 63 °C ambient for TO-92 mounting on FR-4 PCB with no copper pour. With 5 cm² copper pad under lead, usable current extends to ~0.5 A at 63 °C ambient due to improved Rth(j-a).
Is the X0202MA 1BA2 RoHS-compliant and halogen-free?
Yes - the TO-92 package uses lead-free plating and halogen-free molding resin, meeting RoHS Directive 2011/65/EU and JEDEC JS709C standards. ST certifies ECOPACK® compliance, and full material declarations are available in ST's Product Change Notifications (PCN) database.
X0202MA 1BA2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- 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):
- 1.45 V
- Current - On State (It (AV)) (Max):
- 800 mA
- Current - On State (It (RMS)) (Max):
- 1.25 A
- Current - Hold (Ih) (Max):
- 5 mA
- Current - Off State (Max):
- 5 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 22.5A, 25A
- SCR Type:
- Sensitive Gate
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
X0202MA 1BA2 FAQ
1.How can I place an order for X0202MA 1BA2 through Aetrix?
Please submit a Request for Quotation (RFQ) for X0202MA 1BA2 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 X0202MA 1BA2 reliable?
The price and inventory of X0202MA 1BA2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X0202MA 1BA2 is usually 5 days.
3.What payment methods are accepted for X0202MA 1BA2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X0202MA 1BA2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X0202MA 1BA2?
X0202MA 1BA2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X0202MA 1BA2 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 X0202MA 1BA2?
For technical support, including X0202MA 1BA2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X0202MA 1BA2 requirements.
6.How does Aetrix verify that X0202MA 1BA2 is sourced from the original manufacturer or authorized distributors?
All X0202MA 1BA2 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 X0202MA 1BA2 meets industry standards.
7.What is the process for return or replacement of X0202MA 1BA2?
All X0202MA 1BA2 units undergo pre-shipment inspection (PSI). If there is an issue with X0202MA 1BA2, 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 X0202MA 1BA2 part is unused and in its original packaging.
Return procedure for X0202MA 1BA2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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