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NXP Semiconductors OT407,126
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- Part No.:
- OT407,126
- Manufacturer:
- NXP Semiconductors
- Category:
- TRIACs
- Package:
- -
- Datasheet:
-
OT407,126.pdf
- Description:
- TRIAC SOT54A
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
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Product details
Overview
OT407,126 from NXP Semiconductors is a passivated sensitive-gate four-quadrant triac in SOT54A through-hole package, rated for 800 V repetitive peak off-state voltage (VDRM), 1 A RMS on-state current (IT(RMS)), and gate trigger current ≤5 mA in three quadrants (T2+G+, T2+G−, T2−G−). It enables direct logic-level interfacing and low-power AC load switching in compact home appliance controls.
For engineers reviewing the OT407,126 datasheet, OT407,126 pinout, OT407,126 application, or OT407,126 equivalent, this device supports noise-immune AC phase control with validated four-quadrant triggering, 12.5 A non-repetitive surge capability (t = 20 ms), and thermal resistance of 60 K/W junction-to-lead - critical for thermally constrained motor and fan speed control designs.
Technical Context
The OT407,126 implements a passivated silicon structure optimized for enhanced immunity to voltage transients and electromagnetic noise, enabling reliable operation without external snubbers in low-power AC environments. Its four-quadrant gate triggering (T2+G+, T2+G−, T2−G−, T2−G+) allows compatibility with both positive- and negative-polarity gate drive sources.
Static characteristics include latching current ≤25 mA (T2+G− quadrant), holding current ≤10 mA, and on-state voltage ≤1.6 V at 1 A - supporting efficient conduction with minimal heat generation. Dynamic performance is defined by dVD/dt ≥20 V/µs (Tj = 110 °C) and dIT/dt up to 50 A/µs in three quadrants, ensuring robust commutation in inductive loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM | 800 V - blocks full-wave AC line voltage up to 565 V RMS (e.g., 230 VAC mains with safety margin) |
| IT(RMS) | 1 A - supports continuous load currents typical of small fans, solenoids, and indicator lamps |
| IGT (max) | 5 mA (T2+G+, T2+G−, T2−G−); 7 mA (T2−G+) - compatible with microcontroller GPIO or low-power optocouplers |
| ITSM | 12.5 A (t = 20 ms) - withstands inrush surges from cold incandescent lamps or small motors |
| dVD/dt | ≥20 V/µs - resists false triggering from line transients without snubber network |
| Rth(j-lead) | 60 K/W - enables effective heat transfer to PCB copper when leads are soldered to thermal pads |
Pinout & Package
SOT54A is a plastic single-ended leaded through-hole package with wide pitch (5.08 mm lead spacing), 3 leads, and 14.5 mm body length - designed for manual assembly and wave soldering in cost-sensitive consumer electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (T2) | Main Terminal 2 | Primary current path terminal; connects to AC line (hot) side in standard phase-control configurations |
| 2 (G) | Gate | Sensitive control input; triggers conduction in all four quadrants with ≤7 mA current |
| 3 (T1) | Main Terminal 1 | Secondary current path terminal; typically connected to load and neutral in basic switch topology |
Key Features
| Feature | Design Value |
|---|---|
| Four-quadrant triggering | Enables universal gate drive polarity support - eliminates need for external polarity inversion circuitry |
| Enhanced noise immunity | Passivated gate structure and high dVD/dt rating reduce susceptibility to EMI-induced false turn-on |
| Direct logic-level interface | IGT ≤5 mA allows direct connection to 3.3 V/5 V MCU outputs or standard optocouplers (e.g., MOC3021) |
| High blocking voltage | 800 V VDRM provides 2× safety margin over 230 VAC mains, simplifying compliance with IEC 61000-4-5 surge requirements |
Applications
| Home Appliance Control | Low-Power Fan Speed Regulation |
|---|---|
Use Scenario: Solid-state replacement for mechanical thermostats and rotary switches in washing machines, coffee makers, and rice cookers. IC Role / Device Role / Timing Role: AC power switch controlling heater elements or pump motors via phase-angle dimming. Use Value: Enables precise temperature ramping and energy-efficient duty cycling without contact wear or audible buzz. | Use Scenario: Variable-speed control of shaded-pole or PSC fans in air purifiers and bathroom exhaust units. IC Role / Device Role / Timing Role: Bidirectional AC switch synchronized to zero-crossing detection for smooth torque modulation. Use Value: Delivers quiet, stepless airflow adjustment while maintaining >90% efficiency at partial load. |
| Industrial Process Load Switching | Low-Power AC Lighting Dimming |
Use Scenario: On/off and proportional control of solenoid valves, indicator lamps, and small actuators in PLC I/O modules. IC Role / Device Role / Timing Role: Isolated AC output stage driven by optocoupled digital signals for industrial fieldbus interfaces. Use Value: Provides galvanically isolated 1 A switching with <10 µs response time and no moving parts. | Use Scenario: Dimmable LED driver pre-regulator or incandescent lamp controller in smart lighting fixtures. IC Role / Device Role / Timing Role: Leading-edge phase-cut switch triggered by microcontroller PWM signal with zero-crossing reference. Use Value: Achieves flicker-free dimming down to 5% brightness using only passive RC timing and no auxiliary power supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar four-quadrant triac applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BT134-600D,127 | Same SOT54A package; 600 V VDRM (vs. 800 V); IGT ≤10 mA (vs. ≤5 mA); IT(RMS) = 4 A | Lower blocking voltage limits use to 120 VAC systems; higher current rating suits larger loads but requires larger heatsinking | Select when higher RMS current capacity is required and 600 V blocking suffices for target mains voltage |
| MAC97A6,127 | SOT54A package; 600 V VDRM; IGT ≤10 mA; IT(RMS) = 0.8 A; no specified dVD/dt minimum | Reduced surge and noise immunity; lower RMS rating restricts to sub-1 A resistive loads only | Choose for cost-sensitive 120 VAC applications where transient immunity is less critical and load current is <0.8 A |
Compared with BT134-600D,127 and MAC97A6,127, the OT407,126 delivers superior voltage margin (800 V), tighter gate sensitivity (≤5 mA), and verified dVD/dt immunity - making it optimal for 230 VAC environments demanding reliability under noisy line conditions.
Availability
OT407,126 is available at Aetrix Electronics and suitable for home appliance control, low-power fan speed regulation, and industrial process load switching requiring stable component supply across long-lifecycle consumer and industrial programs.
Supply support for OT407,126 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 consumer markets.
The OT407,126 belongs to NXP's legacy discrete power portfolio, designed specifically for cost-effective, noise-immune AC switching in resource-constrained embedded control systems.
FAQ
What is the maximum repetitive peak off-state voltage (VDRM) specification for OT407,126?
The OT407,126 has a VDRM rating of 800 V, meaning it can reliably block AC voltages up to this peak value in repetitive operation. This provides a robust safety margin for 230 VAC mains applications (565 V peak) and ensures compliance with surge immunity standards such as IEC 61000-4-5. The OT407,126 maintains this rating across its full operating temperature range.
Can OT407,126 be directly driven by a 3.3 V microcontroller GPIO pin?
Yes, the OT407,126 can be directly driven by a 3.3 V microcontroller GPIO pin when used with a series current-limiting resistor. Its gate trigger current (IGT) is ≤5 mA in three quadrants and ≤7 mA in T2−G+, allowing reliable triggering with typical 3.3 V outputs sourcing 5–10 mA. The OT407,126's sensitive gate design eliminates the need for external buffer transistors in most low-power control circuits.
What is the thermal resistance from junction to lead (Rth(j-lead)) for OT407,126?
The OT407,126 has a maximum thermal resistance from junction to lead (Rth(j-lead)) of 60 K/W, measured under full-cycle conditions. This value enables predictable thermal design when the device is mounted on a PCB with adequate copper pour connected to each lead. The OT407,126's thermal performance supports 1 A RMS operation without forced cooling in typical through-hole layouts.
Does OT407,126 support four-quadrant triggering, and why does that matter?
Yes, the OT407,126 supports gate triggering in all four quadrants (T2+G+, T2+G−, T2−G−, T2−G+), confirmed in its product data sheet. This allows compatibility with both positive- and negative-polarity gate drive signals - eliminating the need for polarity-inversion circuitry and simplifying interface design with optocouplers like the MOC3021 or microcontroller outputs. The OT407,126's four-quadrant capability ensures reliable turn-on regardless of AC half-cycle polarity.
What is the non-repetitive peak on-state current (ITSM) rating for OT407,126 at 20 ms pulse width?
The OT407,126 is rated for a non-repetitive peak on-state current (ITSM) of 12.5 A at a pulse width of 20 ms, tested at Tj = 25 °C prior to surge. This rating supports safe handling of inrush currents from cold filament lamps, small AC motors, and transformer-coupled loads. The OT407,126's ITSM capability is validated per IEC 60134 and documented in Figure 2 of its official NXP datasheet.
OT407,126 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Triac Type:
- -
- Voltage - Off State:
- -
- Current - On State (It (RMS)) (Max):
- -
- Voltage - Gate Trigger (Vgt) (Max):
- -
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- -
- Current - Gate Trigger (Igt) (Max):
- -
- Current - Hold (Ih) (Max):
- -
- Configuration:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
OT407,126 FAQ
1.How can I place an order for OT407,126 through Aetrix?
Please submit a Request for Quotation (RFQ) for OT407,126 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 OT407,126 reliable?
The price and inventory of OT407,126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OT407,126 is usually 5 days.
3.What payment methods are accepted for OT407,126?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OT407,126 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OT407,126?
OT407,126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OT407,126 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 OT407,126?
For technical support, including OT407,126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OT407,126 requirements.
6.How does Aetrix verify that OT407,126 is sourced from the original manufacturer or authorized distributors?
All OT407,126 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 OT407,126 meets industry standards.
7.What is the process for return or replacement of OT407,126?
All OT407,126 units undergo pre-shipment inspection (PSI). If there is an issue with OT407,126, 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 OT407,126 part is unused and in its original packaging.
Return procedure for OT407,126:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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