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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

NXP Semiconductors BT138-600/DG,127

Name: BT138-600/DG,127
Brand: NXP Semiconductors
SKU: BT138-600/DG,127
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BT138-600/DG,127

Manufacturer:: NXP Semiconductors

Category:: TRIACs

Package:: TO-220-3

Datasheet:: BT138-600/DG,127.pdf

Description:: TRIAC 600V 12A TO220AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BT138-600/DG,127 from NXP Semiconductors is a planar passivated 4-quadrant triac in TO-220AB (SOT78) package, rated for 600 V repetitive peak off-state voltage, 12 A RMS on-state current, and 95 A non-repetitive peak on-state current at 20 ms. It operates up to 125 °C junction temperature and is designed for bidirectional AC switching in motor control, lighting, heating, and static switching circuits.

For engineers reviewing the BT138-600/DG,127 datasheet, BT138-600/DG,127 pinout, BT138-600/DG,127 application, or BT138-600/DG,127 equivalent, this page delivers verified electrical specs, quadrant-triggering behavior, thermal resistance (1.5 K/W junction-to-mounting-base), gate trigger current range (5–70 mA across quadrants), and real-world use context for industrial AC power control design.

Technical Context

The BT138-600/DG,127 supports full four-quadrant triggering (T2+/G+, T2+/G−, T2−/G−, T2−/G+), enabling gate control regardless of main terminal polarity - critical for zero-crossing and phase-angle dimming without external polarity management. Its planar passivation ensures voltage ruggedness and stable dV/dt immunity (100–250 V/µs at 125 °C).

Thermally, it features low R_th(j-mb) of 1.5 K/W (full cycle), allowing efficient heatsink coupling, and is rated for mounting base temperatures up to 99 °C. The device sustains 45 A²s I²t fusing capability and exhibits latching current (10–60 mA) and holding current (6–30 mA) tightly specified across temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DRM	600 V - maximum repetitive off-state voltage the device blocks in both directions without conduction
I_T(RMS)	12 A - continuous RMS current handling at T_mb ≤ 99 °C, defining steady-state AC load capacity
I_TSM	95 A - surge current tolerance for 20 ms half-sine pulses, supporting motor startup and inrush
I_GT (Q1–Q4)	5–70 mA - gate trigger current range across all four quadrants, indicating noise-immune turn-on threshold
dV/dt	100–250 V/µs - minimum rate of off-state voltage rise before unintended turn-on, critical for EMI-rich environments
R_th(j-mb)	1.5 K/W - thermal resistance from junction to mounting base, enabling precise heatsink sizing for 12 A operation
V_T	1.4–1.65 V - on-state voltage drop at 15 A and 25 °C, directly determining conduction loss and thermal load

Pinout & Package

Package: TO-220AB (SOT78), plastic single-ended package with heatsink-mounted mounting base (pin 2/T2), 3 leads, and 1 mounting hole. Dimensions per IEC/JEDEC SC-46 outline: 15.2–16.0 mm length, 9.7–10.3 mm width, 3.5–3.8 mm height, 2.54 mm lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
1	T1	Main terminal 1 - one AC line connection point; current flows between T1 and T2 when triggered
2	T2	Main terminal 2 - second AC line connection point and electrically connected to mounting base for thermal and electrical grounding
3	G	Gate - control input for bidirectional triggering; requires quadrant-specific current to initiate conduction

Key Features

Feature	Design Value
Four-quadrant triggering	Enables gate control with either polarity on T1/T2 and G, eliminating need for external diodes or polarity detection in AC phase control
Planar passivation	Provides consistent voltage blocking and long-term reliability under thermal cycling and high dv/dt stress
High dV/dt immunity	Withstands ≥100 V/µs off-state voltage transients at 125 °C, reducing false triggering in noisy industrial mains
Low thermal resistance	R_th(j-mb) = 1.5 K/W allows compact heatsink design while maintaining 125 °C max junction temperature at full RMS load
Robust surge rating	95 A non-repetitive peak current (20 ms) supports repeated motor starting and resistive load switching without degradation

Applications

AC Fan Speed Control	Incandescent Lamp Dimming
Use Scenario: Variable-speed control of universal motors in ceiling fans or exhaust systems using phase-angle modulation. IC Role / Device Role / Timing Role: Bidirectional AC switch that conducts during selected portions of each half-cycle, directly interrupting mains current flow. Use Value: Enables smooth, silent speed adjustment without mechanical wear; leverages Q1–Q4 triggering to avoid zero-crossing circuitry overhead.	Use Scenario: Residential or commercial dimming of incandescent bulbs via leading-edge phase-cut dimmers. IC Role / Device Role / Timing Role: Main power switching element synchronized to AC zero-crossing for precise conduction angle control. Use Value: Delivers flicker-free dimming down to ~5% brightness with minimal EMI due to controlled dV/dt and gate sensitivity tuning.
Electric Heater On/Off Switching	Industrial Solenoid Driver
Use Scenario: Cycle-based power regulation in resistive heating elements (e.g., ovens, water heaters) using burst-fire control. IC Role / Device Role / Timing Role: High-voltage, high-current AC switch toggling full half-cycles to deliver average power without harmonic distortion. Use Value: Supports 600 V blocking and 12 A RMS load handling, enabling direct mains switching without isolation relays or transformers.	Use Scenario: Driving 230 V AC solenoids in pneumatic valves or industrial actuators requiring fast, reliable coil energization. IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical contactors, providing bounce-free, arcless switching. Use Value: Withstands 95 A surge current for solenoid inrush and maintains 125 °C junction rating under continuous duty cycles.

AC Fan Speed Control

Incandescent Lamp Dimming

Use Scenario: Variable-speed control of universal motors in ceiling fans or exhaust systems using phase-angle modulation.

IC Role / Device Role / Timing Role: Bidirectional AC switch that conducts during selected portions of each half-cycle, directly interrupting mains current flow.

Use Value: Enables smooth, silent speed adjustment without mechanical wear; leverages Q1–Q4 triggering to avoid zero-crossing circuitry overhead.

Use Scenario: Residential or commercial dimming of incandescent bulbs via leading-edge phase-cut dimmers.

IC Role / Device Role / Timing Role: Main power switching element synchronized to AC zero-crossing for precise conduction angle control.

Use Value: Delivers flicker-free dimming down to ~5% brightness with minimal EMI due to controlled dV/dt and gate sensitivity tuning.

Electric Heater On/Off Switching

Industrial Solenoid Driver

Use Scenario: Cycle-based power regulation in resistive heating elements (e.g., ovens, water heaters) using burst-fire control.

IC Role / Device Role / Timing Role: High-voltage, high-current AC switch toggling full half-cycles to deliver average power without harmonic distortion.

Use Value: Supports 600 V blocking and 12 A RMS load handling, enabling direct mains switching without isolation relays or transformers.

Use Scenario: Driving 230 V AC solenoids in pneumatic valves or industrial actuators requiring fast, reliable coil energization.

IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical contactors, providing bounce-free, arcless switching.

Use Value: Withstands 95 A surge current for solenoid inrush and maintains 125 °C junction rating under continuous duty cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-quadrant triac applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STMicroelectronics BT138-600E	Identical V_DRM, I_T(RMS), and TO-220AB package; I_GT max 35 mA (Q1), slightly lower gate sensitivity than BT138-600/DG,127's 70 mA (Q4)	Same motor control and lighting roles; marginally better noise immunity in Q1 but less flexible in Q4-triggered designs	Select when gate drive circuitry is optimized for lower I_GT and sourcing from ST distribution channels
ON Semiconductor MAC12D	Lower V_DRM (400 V), same 12 A RMS rating, TO-220AB package; I_GT up to 50 mA; R_th(j-mb) = 2.0 K/W	Suitable only for 120/230 VAC systems with derated blocking margin; higher thermal resistance demands larger heatsink	Choose for cost-sensitive 230 VAC applications where 400 V blocking suffices and thermal budget permits 0.5 K/W higher resistance

Compared with BT138-600/DG,127, the BT138-600E offers tighter gate current consistency but reduced Q4 flexibility, while the MAC12D trades blocking voltage and thermal performance for broader distributor availability - making BT138-600/DG,127 optimal for 600 V, thermally constrained, or multi-quadrant phase-control designs.

Availability

BT138-600/DG,127 is available at Aetrix Electronics and suitable for motor control, lighting dimming, and heating system designs requiring stable component supply, long-lifecycle support, and traceable industrial-grade sourcing.

Supply support for BT138-600/DG,127 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 applications.

The BT138-600/DG,127 belongs to NXP's high-voltage discrete power portfolio, engineered specifically for robust, maintenance-free AC power switching in harsh thermal and electrical environments.

FAQ

What is the maximum junction temperature rating for BT138-600/DG,127?

The BT138-600/DG,127 has a maximum junction temperature (T_j) of 125 °C, as defined in its limiting values table. This rating enables reliable operation in enclosed industrial enclosures or near heat-generating components when paired with appropriate heatsinking per the 1.5 K/W R_th(j-mb) specification. Exceeding 125 °C risks permanent parametric shift or failure.

Does BT138-600/DG,127 support triggering in all four quadrants?

Yes, BT138-600/DG,127 is explicitly designed as a 4Q triac and supports triggering in all four quadrants (T2+/G+, T2+/G−, T2−/G−, T2−/G+). Gate trigger current ranges from 5 mA (Q1) to 70 mA (Q4) at 25 °C, enabling flexible control architecture without external polarity conditioning circuitry.

What is the thermal resistance from junction to mounting base for BT138-600/DG,127?

The BT138-600/DG,127 has a thermal resistance from junction to mounting base (R_th(j-mb)) of 1.5 K/W for full-cycle operation, as specified in Table 5. This value assumes proper mechanical mounting with thermal interface material and allows accurate calculation of heatsink requirements for sustained 12 A RMS operation.

Can BT138-600/DG,127 replace BT138-600 without design changes?

Yes, BT138-600/DG,127 is a direct variant of the BT138-600 with identical electrical specifications, pinout, and TO-220AB package. The "/DG,127" suffix denotes tape-and-reel packaging and traceability coding per NXP's ordering conventions - no circuit or layout modifications are required when substituting BT138-600/DG,127 for BT138-600.

What is the non-repetitive peak on-state current rating for BT138-600/DG,127?

The BT138-600/DG,127 is rated for 95 A non-repetitive peak on-state current (I_TSM) under full sine-wave conditions at T_j(init) = 25 °C and pulse width t_p = 20 ms. This rating supports short-duration overloads such as motor startup surges or heater inrush currents without device degradation.

BT138-600/DG,127 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: TO-220-3

Packaging:: Bulk

Product Status:: Active

Triac Type:: Standard

Voltage - Off State:: 600 V

Current - On State (It (RMS)) (Max):: 12 A

Voltage - Gate Trigger (Vgt) (Max):: 1.5 V

Current - Non Rep. Surge 50, 60Hz (Itsm):: 95A, 105A

Current - Gate Trigger (Igt) (Max):: 35 mA

Current - Hold (Ih) (Max):: 30 mA

Configuration:: Single

Operating Temperature:: 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AB

BT138-600/DG,127 FAQ

1.How can I place an order for BT138-600/DG,127 through Aetrix?

Please submit a Request for Quotation (RFQ) for BT138-600/DG,127 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 BT138-600/DG,127 reliable?

The price and inventory of BT138-600/DG,127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BT138-600/DG,127 is usually 5 days.

3.What payment methods are accepted for BT138-600/DG,127?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BT138-600/DG,127 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BT138-600/DG,127?

BT138-600/DG,127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BT138-600/DG,127 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 BT138-600/DG,127?

For technical support, including BT138-600/DG,127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BT138-600/DG,127 requirements.

6.How does Aetrix verify that BT138-600/DG,127 is sourced from the original manufacturer or authorized distributors?

All BT138-600/DG,127 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 BT138-600/DG,127 meets industry standards.

7.What is the process for return or replacement of BT138-600/DG,127?

All BT138-600/DG,127 units undergo pre-shipment inspection (PSI). If there is an issue with BT138-600/DG,127, 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 BT138-600/DG,127 part is unused and in its original packaging.

Return procedure for BT138-600/DG,127:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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