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STMicroelectronics X0205MA 1BA2
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- Part No.:
- X0205MA 1BA2
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
X0205MA 1BA2.pdf
- Description:
- SCR 600V 1.25A TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:10
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Product details
Overview
X0205MA 1BA2 from STMicroelectronics is a sensitive-gate silicon-controlled rectifier (SCR) rated for 1.25 A RMS on-state current, 600 V repetitive peak off-state voltage (VDRM), and 50 µA maximum gate trigger current (IGT). It operates in TO-92 package with thermal resistance Rth(j-l) = 60 °C/W and supports ground fault interruption, overvoltage crowbar protection, and capacitive ignition circuits in low-power AC control systems.
For engineers reviewing the X0205MA 1BA2 datasheet, X0205MA 1BA2 pinout, X0205MA 1BA2 application, or X0205MA 1BA2 equivalent, key selection criteria include its ultra-low IGT (50 µA), robust dV/dt immunity (15 V/µs at 110 °C), forward voltage drop ≤1.45 V at 2.5 A, and operation across –40 to +125 °C junction temperature range.
Technical Context
This SCR uses planar passivated junction technology to achieve stable triggering at low gate currents while maintaining high dV/dt immunity. Its latching current (IL) ≤6 mA and holding current (IH) ≤5 mA enable reliable turn-on and sustained conduction under marginal gate drive conditions.
The device features a dynamic on-state resistance (Rd) ≤200 mΩ at 125 °C and exhibits low leakage (IDRM ≤5 µA at 25 °C, ≤500 µA at 125 °C), supporting stable operation in thermally demanding environments without false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 1.25 A - Sustains continuous AC load current in TO-92 package with lead temperature ≤63 °C |
| VDRM / VRRM | 600 V - Blocks up to 600 V reverse or off-state voltage without conduction |
| IGT (Q1) | 50 µA max - Triggers reliably with minimal gate drive, suitable for microcontroller GPIO direct drive |
| dV/dt | 15 V/µs min - Resists false turn-on from fast-rising transients in noisy AC line environments |
| VT (on-state) | 1.45 V max at 2.5 A - Limits conduction loss and self-heating during full-cycle operation |
| IH / IL | 5 mA / 6 mA max - Ensures stable latched state after triggering and prevents dropout during low-load conditions |
| Tj operating range | –40 to +125 °C - Validated performance across industrial ambient and junction temperatures |
Pinout & Package
Supplied in TO-92 package (3-lead, axial through-hole), 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 ≤1.25 A RMS applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A (Anode) | Main current entry terminal | Carries full load current into device; must be connected to positive half-cycle AC source or DC supply rail |
| K (Cathode) | Main current exit terminal | Serves as return path; referenced for gate drive and often tied to system ground or neutral |
| G (Gate) | Trigger control input | Accepts low-current pulse (≥50 µA) to initiate conduction; polarity-sensitive relative to cathode |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IGT | 50 µA max enables direct drive from low-power MCUs or optocouplers without external amplification |
| High dV/dt immunity | 15 V/µs minimum prevents spurious turn-on in EMI-prone AC mains or motor-drive environments |
| Low VT and Rd | 1.45 V on-state drop and ≤200 mΩ dynamic resistance reduce power dissipation and thermal stress |
| Wide Tj range | –40 to +125 °C operation supports deployment in automotive cabin, industrial controls, and outdoor equipment |
Applications
| Ground Fault Circuit Interrupter (GFCI) | AC Power Supply Crowbar |
|---|---|
Use Scenario: Detects differential current imbalance between line and neutral to trip AC output within 25 ms. IC Role / Device Role / Timing Role: SCR acts as fast-acting crowbar switch that shorts AC line to ground upon fault detection signal. Use Value: Enables sub-30 ms fault clearing using only 50 µA gate drive, eliminating need for relay or high-side driver IC. | Use Scenario: Protects downstream DC regulators from overvoltage events caused by feedback loop failure. IC Role / Device Role / Timing Role: SCR clamps output by triggering into conduction when Zener reference exceeds threshold. Use Value: Delivers 25 A non-repetitive surge capability to absorb transient energy without latch-up or degradation. |
| Capacitive Discharge Ignition (CDI) | Low-Power AC Solid-State Relay |
Use Scenario: Controls spark timing in small-engine ignition systems via controlled capacitor discharge. IC Role / Device Role / Timing Role: SCR serves as high-voltage, low-jitter switch releasing stored energy into ignition coil primary. Use Value: Achieves precise firing angle control with 50 µA gate sensitivity and 600 V blocking, reducing timing jitter vs. mechanical points. | Use Scenario: Replaces electromechanical relays in HVAC fan control, lighting dimmers, and appliance timers. IC Role / Device Role / Timing Role: SCR provides zero-crossing–compatible switching for resistive and inductive loads up to 1.25 A RMS. Use Value: Eliminates contact wear and acoustic noise while supporting 100,000+ cycles with no moving parts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MCR106-6 | Higher IGT (500 µA max), same 600 V VDRM, TO-92 package | Requires stronger gate drive; less suitable for direct MCU GPIO use | Select when gate drive circuitry already exists at ≥1 mA level and cost is prioritized |
| Vishay S6006L | Same 600 V rating, but IGT = 200 µA max and IT(RMS) = 6 A (TO-220) | Larger package, higher current capacity, not drop-in compatible | Choose for higher-power crowbar or motor control where board space allows TO-220 mounting |
Compared with MCR106-6 and S6006L, X0205MA 1BA2 offers the lowest gate sensitivity (50 µA) in TO-92 form factor, enabling simpler, lower-component-count designs for low-power AC switching-especially where microcontroller-level drive or space-constrained layouts are critical.
Availability
X0205MA 1BA2 is available at Aetrix Electronics and suitable for ground fault interruption, AC power supply crowbar protection, and capacitive ignition circuits requiring stable component supply and long-term industrial availability.
Supply support for X0205MA 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, digital, and mixed-signal ICs for industrial, automotive, and consumer markets.
The X02 series is ST's dedicated family of sensitive-gate SCRs optimized for low-power AC control, emphasizing ultra-low IGT, high dV/dt immunity, and rugged thermal performance in compact packages.
FAQ
What is the maximum gate-cathode voltage (VGD) specification for X0205MA 1BA2?
VGD is guaranteed ≥0.1 V at VD = VDRM, RGK = 1 kΩ, and Tj = 125 °C. This ensures sufficient gate-cathode isolation to prevent unintended turn-on due to leakage or noise coupling under worst-case thermal and voltage stress.
Can X0205MA 1BA2 be used in zero-crossing switched applications?
Yes-it supports zero-crossing triggering when paired with appropriate phase-control circuitry. Its 15 V/µs dV/dt immunity and 5 µA IDRM at 25 °C ensure stable non-conduction until intentional gate pulse is applied near voltage zero.
Is X0205MA 1BA2 RoHS-compliant and halogen-free?
Yes-this TO-92 device uses lead-free plating and halogen-free molding resin per STMicroelectronics' ECOPACK2 specifications, meeting EU RoHS Directive 2011/65/EU and JEDEC JS709C requirements.
What is the recommended minimum gate resistor value for reliable triggering?
With 50 µA IGT max and typical VGT ≤0.8 V, a 10 kΩ gate resistor limits IG to ~500 µA when driven from 5 V, ensuring robust triggering margin while limiting PG(AV) to <0.2 W. Lower values (e.g., 4.7 kΩ) improve noise immunity without exceeding peak gate current rating.
X0205MA 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):
- 50 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
X0205MA 1BA2 FAQ
1.How can I place an order for X0205MA 1BA2 through Aetrix?
Please submit a Request for Quotation (RFQ) for X0205MA 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 X0205MA 1BA2 reliable?
The price and inventory of X0205MA 1BA2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X0205MA 1BA2 is usually 5 days.
3.What payment methods are accepted for X0205MA 1BA2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X0205MA 1BA2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X0205MA 1BA2?
X0205MA 1BA2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X0205MA 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 X0205MA 1BA2?
For technical support, including X0205MA 1BA2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X0205MA 1BA2 requirements.
6.How does Aetrix verify that X0205MA 1BA2 is sourced from the original manufacturer or authorized distributors?
All X0205MA 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 X0205MA 1BA2 meets industry standards.
7.What is the process for return or replacement of X0205MA 1BA2?
All X0205MA 1BA2 units undergo pre-shipment inspection (PSI). If there is an issue with X0205MA 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 X0205MA 1BA2 part is unused and in its original packaging.
Return procedure for X0205MA 1BA2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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