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STMicroelectronics P0118DA 1AA3
,TO-226_straightlead.jpg)
- Part No.:
- P0118DA 1AA3
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
P0118DA 1AA3.pdf
- Description:
- SCR 400V 800MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,790
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Product details
Overview
P0118DA 1AA3 from STMicroelectronics is a sensitive high-immunity silicon-controlled rectifier (SCR) in TO-92 package, rated for 400 V repetitive peak off-state voltage (VDRM), 0.8 A RMS on-state current (IT(RMS)), and ultra-low gate trigger current (IGT) of 0.5–5 µA. It enables reliable latching in low-power pilot circuits where gate drive is severely constrained, such as ground fault circuit interrupters (GFCIs) and standby-mode AC-DC power supplies.
For engineers reviewing the P0118DA 1AA3 datasheet, P0118DA 1AA3 pinout, P0118DA 1AA3 application, or P0118DA 1AA3 equivalent, key selection criteria include its sub-5-µA IGT threshold, 80 V/µs dV/dt immunity at 125 °C, 1.95 V max on-state voltage at 1.6 A, and thermal resistance of 150 °C/W (junction-to-ambient, TO-92).
Technical Context
This SCR operates as a unidirectional thyristor with regenerative latching behavior triggered by minimal gate current. Its design emphasizes robust turn-on under low-IGT conditions while maintaining high dV/dt immunity (≥75 V/µs at Tj = 125 °C) and low holding current (IH ≤ 5 mA) to prevent false triggering in noisy AC line environments.
It features a dynamic on-state resistance (Rd) of ≤600 mΩ and threshold voltage (Vt0) ≤0.95 V at 125 °C, enabling efficient conduction with minimal forward drop. The device is characterized across –40 to +125 °C junction temperature range and supports non-repetitive surge currents up to 8 A (8.3 ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM / VRRM | 400 V - blocks 400 V AC line peaks without conduction, suitable for 230 VAC mains applications |
| IT(RMS) | 0.8 A - supports continuous load current up to 0.8 A in TO-92 package with 55 °C lead temperature limit |
| IGT (min/max) | 0.5–5 µA - triggers reliably with nanoamp-level gate sources, ideal for high-impedance optocoupler or microcontroller GPIO drives |
| dV/dt (min) | 75 V/µs at Tj = 125 °C - resists false turn-on from fast transients on AC lines or inductive loads |
| VTM (max) | 1.95 V at ITM = 1.6 A - ensures low conduction loss and minimal self-heating during pulsed or sustained on-state operation |
| IH (max) | 5 mA - maintains latched state even with weak gate-cathode leakage or marginal load current |
| Rth(j-a) | 150 °C/W - defines thermal derating curve; requires PCB copper area or heatsinking for >0.3 A continuous use |
Pinout & Package
Package: TO-92 (plastic epoxy, UL94 V0 compliant). Dimensions per ST specification: E = 12.70 mm body length, D = 4.40 mm body width, C = 2.54 mm lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current entry terminal | Connects to AC line phase or high-side load; must withstand full VDRM and IT(RMS) stress |
| Cathode (K) | Main current exit terminal | Reference node for gate drive; ties to load return or neutral; carries full load current |
| Gate (G) | Trigger control input | Accepts sub-5-µA DC pulse to initiate latching; high-impedance input requiring no external pull-down |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IGT range | 0.5–5 µA enables direct drive from CMOS logic or phototriac outputs without amplification |
| High dV/dt immunity | 75 V/µs minimum at 125 °C prevents spurious turn-on in EMI-prone GFCI or relay pilot circuits |
| Low VTM and Rd | 1.95 V max VTM and ≤600 mΩ Rd reduce conduction losses and thermal stress in compact TO-92 housing |
| Wide temperature operation | Rated from –40 to +125 °C junction, supporting industrial and outdoor alarm system deployments |
| ECOPACK® compliance | Meets RoHS and halogen-free requirements per ST's environmental packaging standards |
Applications
| Ground Fault Circuit Interrupter (GFCI) | Solid-State Relay Pilot Stage |
|---|---|
Use Scenario: Detects differential current leakage (>5 mA) between line and neutral, then triggers SCR to cut AC power within milliseconds. IC Role / Device Role / Timing Role: Latching switch that holds tripped state until manual reset; triggered by low-current comparator output. Use Value: Sub-5-µA IGT allows direct interface with high-gain op-amp comparators, eliminating gate driver stages and reducing BOM count. | Use Scenario: Controls main triac or back-to-back MOSFETs in SSRs via isolated gate signal, enabling zero-crossing or random-phase switching. IC Role / Device Role / Timing Role: Isolated pilot-stage SCR providing galvanically separated, self-latching control signal to power stage. Use Value: 5 mA max IH ensures stable latching even with variable load current, while 75 V/µs dV/dt immunity prevents misfire during SSR turn-off transients. |
| Standby Power Supply Enable | Smoke/CO Alarm AC Detection |
Use Scenario: Activates auxiliary 5 V rail in energy-efficient AC-DC adapters only when primary load exceeds threshold. IC Role / Device Role / Timing Role: High-voltage enable switch that latches ON after brief gate pulse and remains ON until AC cycle zero-crossing or controller reset. Use Value: 0.5 µA min IGT permits activation using micropower supervisor ICs with nanoamp output capability, extending battery backup life. | Use Scenario: Monitors AC mains presence to power alarm microcontroller and sensor circuitry during grid operation. IC Role / Device Role / Timing Role: Mains-sensing latching switch that powers system-on-chip only when AC is valid and stable. Use Value: 400 V VDRM withstands surges up to 1 kV (per IEC 61000-4-5), and 125 °C rating supports enclosed plastic enclosures with elevated ambient temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR-based latching switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BT169G | IGT = 5–50 µA (higher min), VDRM = 400 V, TO-92, no specified dV/dt rating | Lacks guaranteed dV/dt immunity; less suitable for noise-sensitive GFCI or alarm inputs | Select when gate drive >5 µA is available and transient immunity is secondary |
| TYN104 | IGT = 10–50 µA, VDRM = 400 V, TO-220, IT(RMS) = 10 A (much higher power) | Over-specified size and current capacity; requires heatsink and larger PCB footprint | Select only when higher surge current (ITSM = 120 A) or thermal margin is mandatory |
Compared with BT169G and TYN104, P0118DA 1AA3 delivers uniquely low IGT and verified dV/dt performance in a cost-optimized TO-92 package-making it the preferred choice for space-constrained, low-power latching applications where gate drive is limited and noise immunity is critical.
Availability
P0118DA 1AA3 is available at Aetrix Electronics and suitable for ground fault detection, solid-state relay pilot control, and AC-powered alarm systems requiring stable component supply and long-term manufacturability.
Supply support for P0118DA 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, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.
The P011xx series belongs to ST's high-immunity SCR product line, engineered specifically for ultra-low-gate-drive latching in safety-critical AC line monitoring and protection circuits.
FAQ
What is the maximum junction temperature for continuous operation?
The P0118DA 1AA3 has an operating junction temperature range of –40 to +125 °C. For continuous conduction at 0.8 A RMS, thermal design must ensure junction temperature stays within this limit-requiring PCB copper area or forced airflow due to its 150 °C/W junction-to-ambient thermal resistance in TO-92.
Can this SCR be used with a microcontroller GPIO directly driving the gate?
Yes-its 0.5 µA minimum IGT allows direct triggering from most 3.3 V or 5 V microcontroller GPIO pins when configured as open-drain with a 10–100 kΩ pull-up to VCC. No external transistor buffer is needed, though a series resistor (≤1 kΩ) is recommended to limit peak gate current during transient events.
Does P0118DA 1AA3 support bidirectional AC switching?
No-it is a unidirectional SCR and conducts current only from anode to cathode. For full-wave AC control, two SCRs must be connected in inverse-parallel, or a triac (e.g., BT136) should be selected instead. Its internal structure lacks reverse-blocking capability beyond VRRM = 400 V.
How does the gate-cathode resistance affect dV/dt immunity?
Per Figure 7 in the datasheet, dV/dt immunity increases as gate-cathode resistance (RGK) decreases-reaching ≥75 V/µs at RGK = 1 kΩ. Using lower RGK (e.g., 470 Ω) improves noise rejection but slightly raises IGT requirement; values above 10 kΩ degrade immunity below 0.5× nominal rating.
P0118DA 1AA3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bag
- Product Status:
- Obsolete
- Voltage - Off State:
- 400 V
- Voltage - Gate Trigger (Vgt) (Max):
- 800 mV
- Current - Gate Trigger (Igt) (Max):
- 5 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
P0118DA 1AA3 FAQ
1.How can I place an order for P0118DA 1AA3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P0118DA 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 P0118DA 1AA3 reliable?
The price and inventory of P0118DA 1AA3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P0118DA 1AA3 is usually 5 days.
3.What payment methods are accepted for P0118DA 1AA3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P0118DA 1AA3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P0118DA 1AA3?
P0118DA 1AA3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P0118DA 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 P0118DA 1AA3?
For technical support, including P0118DA 1AA3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P0118DA 1AA3 requirements.
6.How does Aetrix verify that P0118DA 1AA3 is sourced from the original manufacturer or authorized distributors?
All P0118DA 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 P0118DA 1AA3 meets industry standards.
7.What is the process for return or replacement of P0118DA 1AA3?
All P0118DA 1AA3 units undergo pre-shipment inspection (PSI). If there is an issue with P0118DA 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 P0118DA 1AA3 part is unused and in its original packaging.
Return procedure for P0118DA 1AA3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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