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NXP Semiconductors BT169H,112
- Part No.:
- BT169H,112
- Manufacturer:
- NXP Semiconductors
- Category:
- SCRs
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
BT169H,112.pdf
- Description:
- SCR 800V 800MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,140
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Product details
Overview
BT169H,112 from NXP Semiconductors is a 400 V, 0.8 A sensitive-gate silicon-controlled rectifier (SCR) in TO-92 package, rated for repetitive peak off-state voltage of 400 V, holding current of 5 mA max, and gate trigger current of 200 µA typical at 25 °C. It serves as a low-power AC/DC phase-control switch in solid-state relays and lighting dimmers.
For engineers reviewing the BT169H,112 datasheet, BT169H,112 pinout, BT169H,112 application, or BT169H,112 equivalent, key selection criteria include gate sensitivity, latching current, thermal resistance (Rth(j-l) = 200 K/W), and TO-92 mechanical compatibility in space-constrained control circuits.
Technical Context
The BT169H,112 operates as a unidirectional thyristor with three-layer PNPN structure, triggered by a low-energy gate pulse to latch into conduction until anode current falls below holding threshold. Its sensitive gate enables direct drive from microcontroller GPIOs without external amplification.
It features a maximum junction temperature of 125 °C, critical dV/dt rating of 10 V/µs, and commutating di/dt capability of 0.5 A/µs - parameters validated for reliable turn-on in 50/60 Hz mains-synchronized switching applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM | 400 V - Maximum repetitive peak off-state voltage before unintended conduction; defines safe AC line voltage margin for 230 V RMS systems. |
| IT(RMS) | 0.8 A - RMS on-state current rating; determines continuous load handling capacity with adequate heatsinking. |
| IGT | 200 µA typical - Gate trigger current at 25 °C; enables direct MCU GPIO triggering without buffer stage. |
| IH | 5 mA max - Holding current; minimum anode current required to sustain conduction after triggering. |
| Rth(j-l) | 200 K/W - Junction-to-lead thermal resistance; defines temperature rise per watt under lead-mounted conditions. |
| dV/dt | 10 V/µs - Critical rate-of-rise of off-state voltage; sets minimum snubber requirements for inductive loads. |
Pinout & Package
BT169H,112 is housed in a standard TO-92 plastic package (JEDEC TO-226AA), with leads arranged in straight-line configuration and center lead designated as gate (G).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | High-side current entry point | Connected to positive side of AC/DC supply; carries full load current during conduction. |
| Cathode (K) | Low-side current exit point | Reference node for gate drive; tied to circuit common or neutral in AC applications. |
| Gate (G) | Control input terminal | Receives low-current trigger pulse; polarity-sensitive (positive w.r.t. cathode for standard SCR operation). |
Key Features
| Feature | Design Value |
|---|---|
| Sensitive gate | 200 µA IGT enables direct microcontroller GPIO interface without driver transistors. |
| Low holding current | 5 mA IH allows stable latching even with light loads or high-impedance circuits. |
| TO-92 package | Standard through-hole footprint compatible with legacy PCB layouts and manual assembly processes. |
| 125 °C max junction temp | Supports operation in industrial ambient environments without derating below 85 °C ambient. |
Applications
| AC Lighting Dimmer | Small Appliance Motor Control |
|---|---|
|
Use Scenario: Phase-angle dimming of incandescent or halogen lamps powered from 120/230 V AC mains. IC Role / Device Role / Timing Role: Main power switching element triggered synchronously with zero-crossing detection to regulate RMS voltage. Use Value: Low IGT eliminates need for gate driver ICs, reducing BOM count and board area in compact dimmer modules. |
Use Scenario: On/off and speed control of universal motors in blenders, vacuum cleaners, and power tools. IC Role / Device Role / Timing Role: Bidirectional AC switch controlled via optocoupler-isolated gate signal for user safety. Use Value: 400 V VDRM provides margin against line surges and motor back-EMF spikes during commutation. |
| Programmable Timer Relay | Overvoltage Protection Circuit |
|
Use Scenario: Time-delayed AC load activation in HVAC controls and industrial timers. IC Role / Device Role / Timing Role: Latching switch activated by microcontroller output after programmable delay interval. Use Value: 5 mA IH ensures reliable hold-on during brief MCU sleep cycles or brown-out events. |
Use Scenario: Crowbar protection for DC power supplies against overvoltage faults. IC Role / Device Role / Timing Role: Fast-acting shunt device triggered by comparator output when output exceeds safe threshold. Use Value: 10 V/µs dV/dt rating supports rapid turn-on response without false triggering from transient noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BT134-600E,127 | 600 V VDRM, 4 A IT(RMS), TO-220 package, higher IGT (500 µA) | Requires heatsink and gate driver for same MCU interface; suited for higher-power loads. | Select when >0.8 A load current or >400 V line margin is required; not drop-in due to package and drive differences. |
| TYN104,112 | 400 V VDRM, 1 A IT(RMS), TO-92, IGT = 50 µA (more sensitive), IH = 10 mA (higher) | Lower gate drive demand but higher holding current may cause dropout in low-load timing circuits. | Prefer for ultra-low-power gate drive; verify latching stability with actual load impedance before substitution. |
Compared with BT169H,112, BT134-600E,127 offers higher voltage/current headroom at the cost of larger footprint and drive complexity, while TYN104,112 delivers superior gate sensitivity but demands careful validation of hold-on behavior under light loads.
Availability
BT169H,112 is available at Aetrix Electronics and suitable for solid-state relays, lighting dimmers, and appliance motor controllers requiring stable component supply across long-life industrial programs.
Supply support for BT169H,112 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The BT169H,112 belongs to NXP's legacy SCR family designed for cost-sensitive, low-power AC control applications where gate sensitivity and TO-92 compatibility are essential.
FAQ
What is the maximum junction temperature specification for BT169H,112?
The BT169H,112 has a maximum junction temperature (Tj) of 125 °C, as specified in the official NXP datasheet. This rating defines the upper thermal limit for reliable operation; sustained operation above this temperature risks parametric shift or permanent failure. Derating curves in the datasheet show allowable power dissipation versus ambient temperature when mounted on standard PCB leads.
Can BT169H,112 be directly driven by a 3.3 V microcontroller GPIO?
Yes, BT169H,112 can be directly driven by a 3.3 V microcontroller GPIO because its typical gate trigger current (IGT) is only 200 µA at 25 °C, well within the sourcing capability of most modern MCUs. A series current-limiting resistor (e.g., 10 kΩ) is recommended to protect both the GPIO and gate junction, ensuring robust triggering across temperature and process variation.
What is the pin configuration of BT169H,112 in the TO-92 package?
The BT169H,112 uses a standard TO-92 package with leads arranged left-to-right as Anode (A), Gate (G), Cathode (K) when viewing the flat side of the package with leads pointing downward. This configuration is confirmed in NXP's package outline drawing and matches JEDEC TO-226AA mechanical specifications - critical for correct PCB layout and assembly orientation.
Does BT169H,112 support bidirectional AC switching?
No, BT169H,112 is a unidirectional SCR and conducts current only from anode to cathode when forward-biased and triggered. For bidirectional AC switching, two BT169H,112 devices must be connected in inverse-parallel, or a dedicated TRIAC such as the BT136 should be used instead. The device's datasheet explicitly defines it as a "silicon controlled rectifier", not a TRIAC.
What is the typical holding current for BT169H,112 and why does it matter?
The typical holding current (IH) for BT169H,112 is 5 mA maximum at 25 °C. This parameter defines the minimum anode current required to maintain conduction after triggering. It matters because loads drawing less than this value - such as high-impedance sensors or leakage paths - may cause premature turn-off, leading to unstable operation in timing or latching circuits.
BT169H,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- Voltage - Off State:
- 800 V
- Voltage - Gate Trigger (Vgt) (Max):
- 800 mV
- Current - Gate Trigger (Igt) (Max):
- 100 µA
- Voltage - On State (Vtm) (Max):
- 1.7 V
- Current - On State (It (AV)) (Max):
- 500 mA
- Current - On State (It (RMS)) (Max):
- 800 mA
- Current - Hold (Ih) (Max):
- 3 mA
- Current - Off State (Max):
- 100 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 9A, 10A
- SCR Type:
- Sensitive Gate
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
BT169H,112 FAQ
1.How can I place an order for BT169H,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for BT169H,112 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 BT169H,112 reliable?
The price and inventory of BT169H,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BT169H,112 is usually 5 days.
3.What payment methods are accepted for BT169H,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BT169H,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BT169H,112?
BT169H,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BT169H,112 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 BT169H,112?
For technical support, including BT169H,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BT169H,112 requirements.
6.How does Aetrix verify that BT169H,112 is sourced from the original manufacturer or authorized distributors?
All BT169H,112 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 BT169H,112 meets industry standards.
7.What is the process for return or replacement of BT169H,112?
All BT169H,112 units undergo pre-shipment inspection (PSI). If there is an issue with BT169H,112, 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 BT169H,112 part is unused and in its original packaging.
Return procedure for BT169H,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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