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STMicroelectronics P0109DA 1AA3
,TO-226_straightlead.jpg)
- Part No.:
- P0109DA 1AA3
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
P0109DA 1AA3.pdf
- Description:
- SCR 400V 800MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,428
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Product details
Overview
P0109DA 1AA3 from STMicroelectronics is a sensitive 0.8 A RMS SCR thyristor in SOT-223 package, rated for 600 V repetitive peak off-state voltage (VDRM/VRRM), with gate trigger current ≤200 µA and maximum junction temperature of 125 °C. It serves as a low-power gate driver for larger thyristors and enables overvoltage crowbar protection in standby-mode power supplies.
For engineers reviewing the P0109DA 1AA3 datasheet, P0109DA 1AA3 pinout, P0109DA 1AA3 application, or P0109DA 1AA3 equivalent, key selection criteria include gate sensitivity (IGT ≤ 200 µA), blocking voltage (600 V), thermal resistance (Rth(j-t) = 30 °C/W), and SOT-223 surface-mount compatibility for automated assembly in compact protection circuits.
Technical Context
This SCR operates with highly sensitive gate triggering-requiring only 200 µA IGT at 12 V and 140 Ω load-enabling direct drive from low-current microcontrollers or optocouplers. Its 600 V VDRM rating supports use in 230 V AC mains-connected protection circuits without external voltage scaling.
The device features robust static dV/dt immunity (>75 V/µs at Tj = 125 °C with RGK = 1 kΩ) and low on-state voltage (VTM ≤ 1.95 V at 1.6 A), minimizing conduction loss in crowbar and fault-interrupting applications where fast, reliable latching is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 0.8 A - Supports continuous load switching up to 180° conduction angle at 70 °C ambient. |
| VDRM / VRRM | 600 V - Blocks full-wave rectified 230 V AC mains (peak ~325 V) with margin for transients. |
| IGT (max) | 200 µA - Enables direct drive from GPIO pins or low-output-current optocouplers (e.g., PC817). |
| VGT (max) | 0.8 V - Ensures reliable turn-on even with weak gate drive sources or elevated temperature. |
| dV/dt (min) | 75 V/µs - Resists false triggering from fast-rising noise in high-impedance gate circuits. |
| Rth(j-t) | 30 °C/W - Allows direct thermal coupling to PCB copper pour or heatsink tab for >0.5 W dissipation. |
| IL (max) | 6 mA - Low latching current ensures stable turn-on with minimal gate energy. |
Pinout & Package
SOT-223 package with exposed metal tab (pin 4) serving as the anode connection and primary thermal path. Molded plastic body meets ECOPACK®2 requirements (lead-free, halogen-free, UL94 V0).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (G) | Gate | Low-threshold control input; requires ≥0.8 V and ≥200 µA to initiate conduction. |
| Pin 2 (K) | Cathode | Reference node for gate drive; carries full load current during conduction. |
| Pin 3 (NC) | No Connect | Internally unconnected; must remain floating or grounded per layout guidelines. |
| Pin 4 (A) | Anode (Tab) | Main current path and thermal interface; electrically tied to anode, soldered to copper pour for heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low gate trigger current | ≤200 µA enables direct MCU GPIO or optocoupler drive without amplification. |
| High blocking voltage | 600 V VDRM supports universal-input (90–264 VAC) crowbar and GFCI designs. |
| Robust dV/dt immunity | ≥75 V/µs at 125 °C prevents spurious turn-on in noisy industrial environments. |
| SOT-223 surface-mount package | Enables automated assembly and thermal integration via exposed anode tab. |
| ECOPACK®2 compliance | Lead-free, halogen-free, and UL94 V0 certified for RoHS and environmental compliance. |
Applications
| Ground Fault Circuit Interrupter (GFCI) | Overvoltage Crowbar Protection |
|---|---|
Use Scenario: Detects leakage current imbalance (>5 mA) between line and neutral in residential outlets and trips within 25 ms. IC Role / Device Role / Timing Role: SCR acts as crowbar switch that shorts AC line to ground upon fault detection signal from comparator circuit. Use Value: 200 µA IGT allows direct drive from low-power comparator output; 600 V rating withstands transient surges during fault clearing. | Use Scenario: Protects downstream DC rails (e.g., 12 V, 24 V) from overvoltage events caused by regulator failure or feedback loop loss. IC Role / Device Role / Timing Role: SCR latches on when overvoltage exceeds threshold, diverting current to blow fuse or trip breaker. Use Value: Fast dV/dt immunity (75 V/µs) avoids false triggering from switching noise; low VTM (≤1.95 V) minimizes power loss during crowbar event. |
| Standby Mode Power Supply | Proximity Sensor Interface |
Use Scenario: Maintains ultra-low quiescent current (<100 µA) in AC/DC adapters during no-load standby while retaining fast wake-up capability. IC Role / Device Role / Timing Role: SCR controls auxiliary winding bias supply, enabling zero-crossing-triggered restart without auxiliary transformer. Use Value: 0.2 mA max gate current ensures standby current remains below regulatory limits (e.g., DOE Level VI, EU CoC v5). | Use Scenario: Detects metallic object proximity via eddy-current-induced amplitude shift in LC oscillator. IC Role / Device Role / Timing Role: SCR provides zero-crossing-synchronized load switching to reduce EMI and enable synchronous demodulation. Use Value: Gate sensitivity allows direct interface with low-output swing oscillator comparators; SOT-223 footprint supports compact sensor module layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR gate-driver and crowbar protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP08DE06 | TO-92 package, higher IT(RMS) = 0.8 A but IGT = 500 µA (less sensitive), Rth(j-a) = 100 °C/W. | Requires external gate buffer; unsuitable for space-constrained SMD layouts. | Select when through-hole mounting and higher surge tolerance (ITSM = 12 A) are prioritized over gate sensitivity. |
| BT169G | SOT-23 package, VDRM = 400 V, IGT = 200 µA, but Rth(j-a) = 120 °C/W and no exposed thermal tab. | Limited to lower-power crowbar or signal-level switching due to thermal constraints. | Select only for low-duty-cycle, low-current (<0.3 A RMS) applications where board space is extremely limited. |
Compared with STP08DE06 and BT169G, P0109DA 1AA3 uniquely balances ultra-low gate drive (200 µA), 600 V blocking, and SOT-223 thermal performance-making it optimal for compact, thermally demanding crowbar and GFCI designs requiring direct MCU/opto drive.
Availability
P0109DA 1AA3 is available at Aetrix Electronics and suitable for ground fault circuit interrupters, overvoltage crowbar protection systems, and standby-mode power supplies requiring stable component supply across long-lifecycle industrial and consumer programs.
Supply support for P0109DA 1AA3 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, discrete devices, and MEMS sensors for automotive, industrial, and power applications.
P0109DA 1AA3 belongs to ST's high-immunity sensitive SCR family, engineered specifically for low-power gate driving, fault protection, and zero-crossing switching in safety-critical AC mains interfaces.
FAQ
What is the maximum allowable gate-cathode resistance (RGK) to ensure reliable triggering?
RGK must not exceed 1 kΩ to guarantee turn-on at 125 °C. At higher temperatures, IGT increases and dV/dt immunity decreases; exceeding 1 kΩ risks non-latching or erratic behavior under worst-case conditions. Layout should minimize parasitic inductance and avoid long gate traces.
Can P0109DA 1AA3 be used in 230 V AC line-switching applications?
Yes-it supports 230 V AC full-wave operation with 600 V VDRM, providing 85% voltage margin above peak line voltage (~325 V). For continuous switching, derate IT(RMS) to 0.5 A at 70 °C ambient using the provided derating curves and ensure adequate heatsinking via the anode tab.
Is the SOT-223 tab electrically isolated from other pins?
No-the exposed metal tab is internally connected to the anode (Pin 4) and is not insulated. It must be treated as a live high-voltage node during conduction and thermally coupled to a dedicated copper pour or heatsink. Electrical isolation requires conformal coating or physical barrier design.
Does P0109DA 1AA3 meet creepage and clearance requirements for reinforced insulation?
No-SOT-223 package spacing does not satisfy IEC 60747-10 reinforced insulation requirements for mains-connected applications. External isolation (e.g., optocoupler-driven gate, physical barriers, or PCB slotting) must be implemented to meet safety standards like UL 60950 or IEC 62368.
P0109DA 1AA3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Off State:
- 400 V
- Voltage - Gate Trigger (Vgt) (Max):
- 800 mV
- Current - Gate Trigger (Igt) (Max):
- 200 µA
- Voltage - On State (Vtm) (Max):
- 1.95 V
- Current - On State (It (AV)) (Max):
- 500 mA
- Current - On State (It (RMS)) (Max):
- 800 mA
- Current - Hold (Ih) (Max):
- 5 mA
- Current - Off State (Max):
- 10 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 7A, 8A
- SCR Type:
- Sensitive Gate
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
P0109DA 1AA3 FAQ
1.How can I place an order for P0109DA 1AA3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P0109DA 1AA3 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 P0109DA 1AA3 reliable?
The price and inventory of P0109DA 1AA3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P0109DA 1AA3 is usually 5 days.
3.What payment methods are accepted for P0109DA 1AA3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P0109DA 1AA3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P0109DA 1AA3?
P0109DA 1AA3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P0109DA 1AA3 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 P0109DA 1AA3?
For technical support, including P0109DA 1AA3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P0109DA 1AA3 requirements.
6.How does Aetrix verify that P0109DA 1AA3 is sourced from the original manufacturer or authorized distributors?
All P0109DA 1AA3 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 P0109DA 1AA3 meets industry standards.
7.What is the process for return or replacement of P0109DA 1AA3?
All P0109DA 1AA3 units undergo pre-shipment inspection (PSI). If there is an issue with P0109DA 1AA3, 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 P0109DA 1AA3 part is unused and in its original packaging.
Return procedure for P0109DA 1AA3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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