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STMicroelectronics P0109DA 5AL3
,TO-226_straightlead.jpg)
- Part No.:
- P0109DA 5AL3
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
P0109DA 5AL3.pdf
- Description:
- SCR 400V 800MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,952
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Product details
Overview
P0109DA 5AL3 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 ultra-low 200 µA gate trigger current (IGT) and 125 °C maximum junction temperature. It serves as a high-immunity crowbar protection device and gate driver for larger thyristors in low-power interrupter circuits.
For engineers reviewing the P0109DA 5AL3 datasheet, P0109DA 5AL3 pinout, P0109DA 5AL3 application, or P0109DA 5AL3 equivalent, key selection criteria include gate sensitivity (≤200 µA IGT), dV/dt immunity (≥75 V/µs at Tj = 125 °C), thermal resistance (Rth(j-t) = 30 °C/W), and SOT-223 surface-mount compatibility for automated assembly in safety-critical power control designs.
Technical Context
This SCR operates in forward-conducting mode triggered by a low-energy gate pulse, latching until current falls below the holding current (IH ≤ 5 mA). Its high dV/dt immunity (min. 75 V/µs) and low IGT enable reliable triggering in noisy environments with limited drive capability.
The device uses a planar passivated silicon structure optimized for stable turn-on behavior across –40 to +125 °C junction temperature range. Its 600 V blocking rating and 8 A non-repetitive surge current (tp = 8.3 ms) support transient overvoltage clamping in AC line protection applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 0.8 A - Continuous RMS on-state current at Tamb = 70 °C, defining steady-state power handling in crowbar or switching circuits |
| VDRM / VRRM | 600 V - Maximum repetitive peak off-state voltage, enabling use in 230 VAC mains-connected protection circuits |
| IGT | 200 µA max - Gate trigger current at VD = 12 V, RL = 140 Ω, allowing direct drive from low-power microcontrollers or optocouplers |
| dV/dt | 75 V/µs min - Critical rate of rise of off-state voltage at Tj = 125 °C, ensuring noise immunity in high-dV/dt environments |
| Rth(j-t) | 30 °C/W - Junction-to-tab thermal resistance, supporting heatsink attachment via the exposed tab for thermal management |
| IH | 5 mA max - Holding current at IT = 50 mA, RGK = 1000 Ω, determining minimum load current required to sustain conduction |
| VTM | 1.95 V max - On-state voltage at ITM = 1.6 A, tp = 380 µs, defining conduction loss and self-heating under surge conditions |
Pinout & Package
The P0109DA 5AL3 is housed in a standard SOT-223 package with an exposed metal tab (pin 4) serving as the cathode connection and thermal path. The package supports reflow soldering and meets ECOPACK®2 environmental compliance (lead-free, halogen-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current input terminal | Carries load current into the device during forward conduction; electrically isolated from tab |
| Cathode (K) | Main current return terminal | Connected internally to the exposed metal tab; provides primary thermal path and circuit reference |
| Gate (G) | Trigger control terminal | Accepts low-current pulse to initiate conduction; requires <200 µA for reliable turn-on |
| Tab (K) | Thermal & electrical cathode extension | Provides mechanical mounting surface and thermal dissipation path; must be electrically tied to system cathode |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-sensitive gate triggering | IGT ≤ 200 µA enables direct interface with low-drive logic or phototriac drivers without amplification |
| High dV/dt immunity | 75 V/µs minimum ensures robust operation in EMI-prone AC line sensing and protection circuits |
| 600 V blocking capability | Supports universal 100–240 VAC input systems without external voltage dividers or snubbers |
| SOT-223 surface-mount package | Enables compact, automated PCB assembly while providing 30 °C/W junction-to-tab thermal resistance |
| ECOPACK®2 compliance | Lead-free terminations and halogen-free molding compound meet RoHS and JEDEC MSL-3 requirements |
Applications
| Proximity Sensor Protection | Ground Fault Circuit Interrupter (GFCI) |
|---|---|
Use Scenario: Detects capacitive coupling changes in proximity sensors and triggers fast crowbar action upon fault detection. IC Role / Device Role / Timing Role: SCR acts as a latchable overvoltage clamp, turning on within microseconds when gate signal exceeds threshold. Use Value: Prevents false triggering from EMI due to 75 V/µs dV/dt immunity and sustains conduction until system reset. | Use Scenario: Monitors differential current imbalance between line and neutral conductors in residential wiring. IC Role / Device Role / Timing Role: Thyristor serves as the final trip actuator, shorting the circuit when fault current exceeds safe threshold. Use Value: Low 200 µA IGT allows direct drive from isolation amplifier outputs, eliminating discrete transistor stages. |
| Arc Fault Circuit Interrupter (AFCI) | Standby Mode Power Supply Control |
Use Scenario: Detects high-frequency current transients indicative of series or parallel arcing in branch circuits. IC Role / Device Role / Timing Role: SCR functions as a fail-safe shunt element activated by analog comparator output during arc signature detection. Use Value: 600 V VDRM rating permits direct connection across 240 VAC lines without voltage scaling components. | Use Scenario: Enables zero-power standby by disconnecting auxiliary power rails after main converter shutdown. IC Role / Device Role / Timing Role: SCR replaces mechanical relays to provide solid-state, bounce-free power gating during sleep/wake transitions. Use Value: SOT-223 footprint reduces board area vs. through-hole alternatives while maintaining 0.8 A RMS current capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR-based protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP08DE06 | TO-92 package, same 600 V/0.8 A rating but higher IGT (500 µA), Rth(j-a) = 100 °C/W | Limited to low-power, non-SMD designs; unsuitable for automated assembly or thermally constrained layouts | Select when manual assembly or legacy through-hole compatibility is required |
| BT169G | 400 V VDRM, 0.8 A IT(RMS), IGT = 500 µA, TO-92 package, no ECOPACK®2 compliance | Not rated for 230 VAC line protection; lower dV/dt immunity (50 V/µs) increases susceptibility to false triggering | Choose only for cost-sensitive, low-voltage (<200 VAC) applications where environmental compliance is secondary |
Compared with STP08DE06 and BT169G, P0109DA 5AL3 offers superior gate sensitivity, higher voltage rating, better thermal performance via SOT-223 tab, and full ECOPACK®2 compliance-making it optimal for modern SMD-based safety-critical crowbar and GFCI/AFCI designs.
Availability
P0109DA 5AL3 is available at Aetrix Electronics and suitable for ground fault circuit interrupters, arc fault circuit interrupters, proximity sensor protection circuits, and standby-mode power supply control requiring stable component supply and long-term lifecycle assurance.
Supply support for P0109DA 5AL3 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 power management applications.
P0109DA 5AL3 belongs to ST's high-immunity sensitive SCR product line, engineered specifically for low-power, high-reliability overvoltage protection and solid-state switching in safety-critical AC line monitoring systems.
FAQ
What is the maximum junction temperature for continuous operation?
The P0109DA 5AL3 has a specified operating junction temperature range of –40 to +125 °C. Continuous operation at 125 °C requires thermal design that maintains junction temperature within this limit using the tab as a heat path, with Rth(j-t) = 30 °C/W and appropriate copper area per datasheet recommendations.
Can this SCR be used without a gate resistor?
No. A gate resistor (RGK) is required to limit peak gate current and ensure reliable triggering. Datasheet test conditions specify RGK = 1000 Ω for IGT, IH, and IL measurements. Omitting it risks exceeding the 1 A peak gate current (IGM) rating and causing premature gate degradation or erratic turn-on behavior.
Is the SOT-223 tab electrically isolated from the cathode?
No. The exposed metal tab is internally connected to the cathode (K) terminal. It must be electrically tied to the system cathode node and may serve as the primary thermal interface. Any insulation between tab and PCB copper must be electrically non-conductive but thermally conductive if heatsinking is needed.
How does the 0.24 A²s I²t rating impact surge handling?
The 0.24 A²s I²t value (at tp = 10 ms) defines the fusing limit for single half-cycle surges. It indicates the device can withstand up to 7 A for 10 ms or 8 A for 8.3 ms without destructive failure, making it suitable for clamping brief overvoltage transients in AC line protection without requiring upstream fusing.
P0109DA 5AL3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Reel (TR)
- 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):
- 1.95 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 5AL3 FAQ
1.How can I place an order for P0109DA 5AL3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P0109DA 5AL3 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 5AL3 reliable?
The price and inventory of P0109DA 5AL3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P0109DA 5AL3 is usually 5 days.
3.What payment methods are accepted for P0109DA 5AL3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P0109DA 5AL3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P0109DA 5AL3?
P0109DA 5AL3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P0109DA 5AL3 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 5AL3?
For technical support, including P0109DA 5AL3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P0109DA 5AL3 requirements.
6.How does Aetrix verify that P0109DA 5AL3 is sourced from the original manufacturer or authorized distributors?
All P0109DA 5AL3 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 5AL3 meets industry standards.
7.What is the process for return or replacement of P0109DA 5AL3?
All P0109DA 5AL3 units undergo pre-shipment inspection (PSI). If there is an issue with P0109DA 5AL3, 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 5AL3 part is unused and in its original packaging.
Return procedure for P0109DA 5AL3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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