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STMicroelectronics X0203MA 2BL2
,TO-226_straightlead.jpg)
- Part No.:
- X0203MA 2BL2
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
X0203MA 2BL2.pdf
- Description:
- SCR 600V 1.25A TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,866
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Product details
Overview
X0203MA from STMicroelectronics is a sensitive-gate silicon-controlled rectifier (SCR) in TO-92 plastic package, rated for 400 V repetitive peak off-state voltage (VDRM), 1.25 A RMS on-state current (IT(RMS)), and 200 µA maximum gate trigger current (IGT). It operates across -40°C to +125°C junction temperature and is used in low-power AC phase-control circuits such as lamp dimmers and small appliance motor speed controllers.
For engineers reviewing the X0203MA datasheet, X0203MA pinout, X0203MA application, or X0203MA equivalent, key selection criteria include gate sensitivity (≤200 µA), low holding current (≤5 mA), thermal resistance (Rth(j-l) = 60 °C/W), and surge capability (22.5 A @ 10 ms).
Technical Context
This SCR employs TOP GLASS PNPN technology optimized for reliable turn-on with minimal gate drive. Its low IGT (≤200 µA) and low VGT (≤0.8 V) enable direct drive from microcontroller GPIOs or low-power logic without external amplification.
It features a critical dI/dt rating of 30 A/µs and dV/dt immunity of 15–20 V/µs at 110°C, supporting stable operation in noisy AC line environments. Turn-off time (tq) is ≤100 µs under specified commutation conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM | 400 V - Maximum repetitive blocking voltage in off-state; defines AC line compatibility up to 280 V RMS. |
| IT(RMS) | 1.25 A - Continuous RMS current handling at 60°C lead temperature; sets thermal design margin for TO-92 mounting. |
| IGT | ≤200 µA - Gate trigger current at 25°C; enables direct MCU GPIO control without buffer stage. |
| VGT | ≤0.8 V - Gate trigger voltage; ensures compatibility with 3.3 V and 5 V logic families. |
| tq | ≤100 µs - Turn-off time at 110°C; determines minimum commutation interval in phase-control timing. |
| Rth(j-l) | 60 °C/W - Junction-to-leads thermal resistance; guides PCB copper area and solder joint design for thermal management. |
| ITSM (10 ms) | 22.5 A - Non-repetitive surge current; supports brief inrush loads like transformer energization or capacitor charging. |
Pinout & Package
TO-92 plastic package with axial leads; standard three-terminal SCR configuration (Anode, Cathode, Gate) oriented per JEDEC TO-92 outline. Leads are tinned and suitable for wave or hand soldering at 260°C for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current entry terminal in forward conduction | Connected to AC line phase or load high-side; must withstand full VDRM and ITSM stress. |
| Cathode (K) | Main current exit terminal and reference for gate drive | Serves as common return path; gate trigger referenced to this node; impacts layout ground loop integrity. |
| Gate (G) | Control input for triggering conduction | High-impedance, low-current input; requires <200 µA pulse; sensitive to noise-requires short, shielded trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| Low gate trigger sensitivity | IGT ≤ 200 µA at 25°C - eliminates need for gate driver ICs in battery-powered or low-power control systems. |
| Stable high-temperature operation | Tj range −40°C to +125°C - supports use in enclosed industrial enclosures without active cooling. |
| Robust dV/dt immunity | 15–20 V/µs at 110°C - prevents false triggering from line transients in mains-connected appliances. |
| Controlled turn-off behavior | tq ≤ 100 µs - enables precise zero-crossing or phase-angle control in 50/60 Hz AC applications. |
| Thermally efficient lead-frame | Rth(j-l) = 60 °C/W - allows >0.8 A average current with minimal PCB copper when leads are soldered to 2 mm² copper pour. |
Applications
| Lamp Dimmer Circuit | Small Appliance Motor Control |
|---|---|
Use Scenario: Phase-controlled AC power delivery to incandescent or halogen lamps in residential lighting systems. IC Role / Device Role / Timing Role: Main switching element triggered at adjustable phase angle to regulate RMS voltage applied to lamp filament. Use Value: Enables smooth brightness adjustment with minimal BOM count; leverages low IGT to interface directly with triac-compatible optocouplers or MCU timers. | Use Scenario: Speed regulation of universal motors in portable vacuum cleaners or power tools. IC Role / Device Role / Timing Role: Half-wave or full-wave controlled rectifier in motor armature supply path, synchronized to AC line zero-crossing. Use Value: Provides cost-effective, compact motor control without requiring H-bridge or PWM driver IC; TO-92 footprint simplifies mechanical integration. |
| AC Solid-State Relay Driver | Overvoltage Crowbar Protection |
Use Scenario: Low-power gate driver stage for higher-current main SCRs or triacs in industrial relay modules. IC Role / Device Role / Timing Role: Sensitive-gate trigger switch that isolates and amplifies control signal before driving main power device. Use Value: Reduces required isolation barrier current by >5× vs. direct drive of main triac; improves system reliability under EMI stress. | Use Scenario: Fast-acting overvoltage protection circuit clamping DC bus in SMPS or motor drives during transient events. IC Role / Device Role / Timing Role: Crowbar device triggered by voltage monitor comparator to short-circuit supply and force fuse blow or upstream breaker trip. Use Value: Sub-100 µs tq ensures rapid fault response; 22.5 A ITSM handles brief crowbar conduction without failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sensitive-gate SCR applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BT169G | VDRM = 400 V, IGT ≤ 200 µA, but Rth(j-l) = 70 °C/W and IT(RMS) = 0.8 A | Lower RMS current rating limits continuous duty in thermally constrained designs | Select when gate drive constraints match but thermal margin is less critical than cost |
| TYN204 | VDRM = 400 V, IT(RMS) = 1.25 A, but IGT ≤ 500 µA and no TO-92 option | Requires gate buffer stage; available only in TO-220, increasing board space and thermal mass | Select when higher surge robustness (ITSM = 30 A) is prioritized over size and gate simplicity |
Compared with BT169G and TYN204, X0203MA uniquely balances low gate drive (≤200 µA), TO-92 compactness, and 1.25 A RMS rating-making it optimal for space-constrained, low-power AC control where direct microcontroller interfacing is required.
Availability
X0203MA is available at Aetrix Electronics and suitable for lamp dimmers, small-appliance motor controls, solid-state relay drivers, and overvoltage crowbar circuits requiring stable component supply across extended production lifecycles.
Supply support for X0203MA 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, specializing in power management, analog, and discrete devices for industrial, automotive, and consumer markets.
The X02xxxA series was designed specifically for cost-sensitive, low-power AC phase-control applications demanding high gate sensitivity, robust thermal performance in small packages, and long-term reliability in mains-connected equipment.
FAQ
What is the maximum allowable lead temperature during soldering?
The maximum lead temperature for soldering is 260°C for 10 seconds measured at 2 mm from the case. This specification ensures bond integrity and avoids internal die stress while remaining compatible with standard wave and reflow profiles for TO-92 packages.
Can X0203MA be driven directly from a 3.3 V microcontroller GPIO?
Yes-its maximum gate trigger voltage (VGT) is 0.8 V and gate trigger current (IGT) is ≤200 µA at 25°C, well within the sourcing capability of most 3.3 V GPIOs. A series current-limiting resistor (e.g., 10 kΩ) is recommended to prevent latch-up under transient conditions.
How does junction temperature affect gate trigger current?
IGT increases with junction temperature: at 125°C, IGT is approximately 2.5× its 25°C value (per Fig.5). Designers must ensure gate drive remains sufficient across the full operating range (−40°C to +125°C), especially in thermally stressed environments.
Is X0203MA suitable for zero-crossing switching applications?
No-it is not inherently zero-crossing capable. As a standard SCR, it conducts until current falls below holding current (IH ≤ 5 mA). Zero-crossing operation requires external timing circuitry (e.g., optocoupler + timer) to gate-trigger precisely at voltage zero.
X0203MA 2BL2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Box (TB)
- 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):
- 1.45 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
X0203MA 2BL2 FAQ
1.How can I place an order for X0203MA 2BL2 through Aetrix?
Please submit a Request for Quotation (RFQ) for X0203MA 2BL2 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 X0203MA 2BL2 reliable?
The price and inventory of X0203MA 2BL2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X0203MA 2BL2 is usually 5 days.
3.What payment methods are accepted for X0203MA 2BL2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X0203MA 2BL2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X0203MA 2BL2?
X0203MA 2BL2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X0203MA 2BL2 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 X0203MA 2BL2?
For technical support, including X0203MA 2BL2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X0203MA 2BL2 requirements.
6.How does Aetrix verify that X0203MA 2BL2 is sourced from the original manufacturer or authorized distributors?
All X0203MA 2BL2 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 X0203MA 2BL2 meets industry standards.
7.What is the process for return or replacement of X0203MA 2BL2?
All X0203MA 2BL2 units undergo pre-shipment inspection (PSI). If there is an issue with X0203MA 2BL2, 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 X0203MA 2BL2 part is unused and in its original packaging.
Return procedure for X0203MA 2BL2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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