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STMicroelectronics X0202DA 1BA2
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- Part No.:
- X0202DA 1BA2
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
X0202DA 1BA2.pdf
- Description:
- SCR 400V 1.25A TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,703
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Product details
Overview
X0202DA 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, supports crowbar overvoltage protection and capacitive ignition circuits, and delivers low forward voltage drop (≤1.45 V at 2.5 A) and high dV/dt immunity (≥10 V/µs) for reliable switching in harsh industrial environments.
For engineers reviewing the X0202DA 1BA2 datasheet, X0202DA 1BA2 pinout, X0202DA 1BA2 application, or X0202DA 1BA2 equivalent, key selection criteria include gate sensitivity (50 µA min), thermal resistance (Rth(j-l) = 60 °C/W), holding current (≤5 mA), and TO-92 mechanical compatibility for space-constrained PCB layouts.
Technical Context
This SCR uses planar passivated junction technology to achieve stable triggering across -40 °C to +125 °C junction temperature range. Its low IGT (50 µA minimum) enables direct drive from microcontroller GPIOs without external amplification, while high dV/dt immunity (10–15 V/µs) prevents false turn-on in noisy power supply rails.
The device features asymmetric blocking capability (VDRM = VRRM = 600 V), low dynamic resistance (≤200 mΩ), and robust surge rating (22.5 A at 60 Hz, 10 ms). Thermal design is supported by Rth(j-l) = 60 °C/W and maximum lead temperature of 63 °C under full conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 1.25 A - Sustains continuous load current in AC phase-control or crowbar applications without heatsinking at TL ≤ 63 °C. |
| VDRM / VRRM | 600 V - Blocks line transients up to 600 V in both directions; suitable for 230 VAC mains-connected protection circuits. |
| IGT (Q1) | 50–200 µA - Enables direct MCU GPIO triggering; 50 µA min ensures reliable turn-on even at elevated temperature. |
| VTO / VT | 0.9 V (Tj = 125 °C) - Low threshold voltage reduces conduction losses and self-heating during sustained on-state operation. |
| dV/dt (min) | 10 V/µs - Immune to rapid voltage transients common in switch-mode power supplies and motor drives. |
| IH (max) | 5 mA - Low holding current allows clean turn-off after transient events, critical for GFCI and crowbar reset behavior. |
| Rth(j-l) | 60 °C/W - Defines thermal path from junction to TO-92 leads; sets max power dissipation limit at 63 °C lead temp. |
Pinout & Package
Supplied in TO-92 package (plastic, 3-lead, axial-leaded), with standard pin configuration: Lead 1 = Anode (A), Lead 2 = Cathode (K), Lead 3 = Gate (G). Package meets UL94 V0 flammability rating and is halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A (Lead 1) | Anode | Main current entry terminal; connects to positive side of AC source or DC bus in crowbar/switching topologies. |
| K (Lead 2) | Cathode | Main current exit terminal; referenced as ground or return path; gate-cathode resistance (RGK) directly affects dV/dt immunity. |
| G (Lead 3) | Gate | Control input; requires ≥50 µA pulse to initiate conduction; polarity-sensitive (A2-to-A1 referenced per datasheet). |
Key Features
| Feature | Design Value |
|---|---|
| Sensitive gate triggering | 50 µA minimum IGT enables direct drive from low-power logic without buffer stages. |
| Low on-state voltage | ≤0.9 V at 125 °C reduces conduction loss and improves thermal margin in sealed enclosures. |
| High dV/dt immunity | ≥10 V/µs at 110 °C prevents spurious turn-on in EMI-heavy industrial power systems. |
| Robust surge rating | 22.5 A non-repetitive surge (60 Hz, 10 ms) supports repeated fault-clearing in protection circuits. |
| Wide operating temperature | -40 to +125 °C junction range ensures reliability in automotive under-hood and industrial control environments. |
Applications
| Ground Fault Circuit Interrupter (GFCI) | Overvoltage Crowbar Protection |
|---|---|
Use Scenario: Detects leakage current imbalance (>5 mA) between line and neutral in residential/commercial outlets and triggers fast shutdown. IC Role / Device Role / Timing Role: SCR acts as latched crowbar switch; triggered by comparator output to short AC line and blow fuse. Use Value: 5 mA max holding current ensures immediate latch-and-hold upon detection; TO-92 form factor fits compact outlet PCBs. |
Use Scenario: Protects downstream DC-DC converters from input overvoltage events exceeding 600 V peak. IC Role / Device Role / Timing Role: SCR placed across input rail; triggered by Zener-clamped voltage monitor to clamp and divert surge energy. Use Value: 600 V VDRM withstands 230 VAC line surges; 1.25 A IT(RMS) sustains crowbar current until upstream fuse opens. |
| Capacitive Ignition System | AC Phase-Control Dimmer |
Use Scenario: Discharges stored capacitor into primary winding of ignition coil to generate high-voltage spark in small engines. IC Role / Device Role / Timing Role: SCR serves as precision-triggered discharge switch; gated by timing circuit synchronized to engine rotation. Use Value: 50 µA IGT allows direct triggering from Hall-effect sensor outputs; low VT minimizes energy loss in spark cycle. |
Use Scenario: Controls RMS power delivered to resistive loads (e.g., heaters, lamps) via adjustable conduction angle in 50/60 Hz AC. IC Role / Device Role / Timing Role: SCR functions as half-wave or full-wave AC switch; gated near zero-crossing to reduce EMI. Use Value: 10 V/µs dV/dt immunity prevents misfiring during phase-angle transitions; TO-92 mounting simplifies thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STX0202MA 1BA2 | Same die, identical electrical specs; marking variant with "ST" prefix per ST's internal revision control. | No functional difference; used interchangeably in same TO-92 footprint and BOMs. | Select when sourcing from ST-authorized channels requiring full traceability to ST part numbering. |
| Littelfuse S4006L | Higher IGT (500 µA typ), higher VDRM (400 V), TO-92 package, but lower dV/dt (6 V/µs) and no 50 µA sensitivity. | Not suitable for direct MCU drive; requires gate buffer; limited to less-noisy 120 VAC applications. | Choose only if legacy design already uses S4006L and gate drive circuitry exists; not recommended for new designs targeting low-power triggering. |
Compared with ST's X0202DA 1BA2, the STX0202MA 1BA2 offers identical performance with enhanced traceability, while the Littelfuse S4006L lacks the 50 µA sensitivity and dV/dt margin needed for noise-immune, microcontroller-driven crowbar systems.
Availability
X0202DA 1BA2 is available at Aetrix Electronics and suitable for ground fault interruption, overvoltage crowbar protection, and capacitive ignition circuits requiring stable component supply and long-term industrial availability.
Supply support for X0202DA 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 automotive, industrial, and consumer markets.
The X02 series targets cost-sensitive, high-reliability SCR applications-especially safety-critical protection and ignition systems-where low gate drive, thermal robustness, and long-life stability are mandatory.
FAQ
Is X0202DA 1BA2 compatible with standard TO-92 footprints?
Yes. X0202DA 1BA2 uses industry-standard TO-92 package with lead spacing of 2.54 mm (0.100 inch) and overall dimensions matching JEDEC TO-92 outline. Mechanical data in DS2122 Rev 7 confirms A = 1.35 mm height, E = 12.70 mm length, and C = 2.54 mm width-fully compatible with automated placement and reflow profiles for TO-92.
What is the maximum allowable gate-cathode resistance for reliable triggering?
Per Figure 6 in DS2122 Rev 7, RGK must be ≤1 kΩ to maintain IGT ≤200 µA across -40 °C to +125 °C. At RGK = 1 kΩ, IGT remains within spec; increasing RGK above 1.5 kΩ risks failure to trigger at high temperature due to reduced effective gate current.
Can X0202DA 1BA2 replace BT169D in existing designs?
No. BT169D has 600 V VDRM but specifies IGT = 200 µA (typ), not guaranteed down to 50 µA. X0202DA 1BA2's 50 µA minimum IGT provides tighter low-current triggering assurance-critical for GFCI and battery-powered ignition. Substitution requires validation of gate drive strength and dV/dt margin.
Does this SCR support bidirectional blocking in AC circuits?
No. X0202DA 1BA2 is a unidirectional SCR: it blocks voltage only in reverse direction (cathode positive relative to anode) and conducts only when anode is positive and gate is triggered. For full-wave AC control, two SCRs must be used in inverse-parallel configuration or a TRIAC selected instead.
X0202DA 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:
- 400 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
X0202DA 1BA2 FAQ
1.How can I place an order for X0202DA 1BA2 through Aetrix?
Please submit a Request for Quotation (RFQ) for X0202DA 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 X0202DA 1BA2 reliable?
The price and inventory of X0202DA 1BA2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X0202DA 1BA2 is usually 5 days.
3.What payment methods are accepted for X0202DA 1BA2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X0202DA 1BA2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X0202DA 1BA2?
X0202DA 1BA2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X0202DA 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 X0202DA 1BA2?
For technical support, including X0202DA 1BA2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X0202DA 1BA2 requirements.
6.How does Aetrix verify that X0202DA 1BA2 is sourced from the original manufacturer or authorized distributors?
All X0202DA 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 X0202DA 1BA2 meets industry standards.
7.What is the process for return or replacement of X0202DA 1BA2?
All X0202DA 1BA2 units undergo pre-shipment inspection (PSI). If there is an issue with X0202DA 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 X0202DA 1BA2 part is unused and in its original packaging.
Return procedure for X0202DA 1BA2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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