NXP Semiconductors BT138-600D,127

Overview

BT138-600D,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 and 12 A RMS on-state current. It features very sensitive gate triggering (max 10 mA IGT across all quadrants), direct compatibility with microcontrollers and logic ICs, and operates up to 125 °C junction temperature. It is used in phase-controlled AC lighting dimmers and solid-state relay switching circuits.

For engineers reviewing the BT138-600D,127 datasheet, BT138-600D,127 pinout, BT138-600D,127 application, or BT138-600D,127 equivalent, key selection criteria include four-quadrant gate sensitivity, dVD/dt immunity (50 V/µs), thermal resistance (1.5 K/W j-mb), blocking voltage margin, and mounting-base–referenced T2 terminal configuration.

Technical Context

This 4Q triac uses planar passivation for enhanced voltage ruggedness and reliability in bidirectional AC switching. Its gate trigger current is specified across all four quadrants (T2+/G+, T2+/G−, T2−/G−, T2−/G+), enabling robust triggering without external polarity conditioning.

It supports full-sine-wave conduction with RMS current up to 12 A at Tmb ≤ 99 °C and non-repetitive surge capability of 95 A (20 ms, 50 Hz). Thermal design relies on low junction-to-mounting-base resistance (1.5 K/W full cycle) and requires heatsink mounting per TO-220AB mechanical outline.

Key Specifications

Pinout & Package

BT138-600D,127 is housed in a TO-220AB (SOT78) plastic single-ended package with heatsink mounting, 1 mounting hole, and 3 leads. The mounting base is electrically connected to main terminal 2 (T2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BT138-600E and MAC12N60G, BT138-600D,127 provides superior noise immunity (50 V/µs vs. 25 V/µs) and guaranteed four-quadrant operation without external circuitry - reducing BOM count and improving system-level reliability in cost-sensitive consumer and industrial controls.

Availability

BT138-600D,127 is available at Aetrix Electronics and suitable for AC lighting dimmers, solid-state relays, appliance motor controllers, and heating element regulators requiring stable component supply and long-lifecycle support.

Supply support for BT138-600D,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 IoT applications.

The BT138-600D,127 belongs to NXP's high-sensitivity 4Q triac product line, designed specifically for direct microcontroller interfacing in cost-sensitive, space-constrained AC power control systems.

FAQ

What is the maximum gate trigger current specification for BT138-600D,127 across all quadrants?

The BT138-600D,127 has a maximum gate trigger current (I_GT) of 10 mA in the T2−/G+ quadrant, with lower values in other quadrants (5.5 mA typ in T2−/G+, 3.2 mA typ in T2−/G−). This ensures reliable triggering from standard logic-level outputs without external amplification, making BT138-600D,127 ideal for direct MCU interface in compact designs.

Can BT138-600D,127 be used without a heatsink in low-duty-cycle applications?

BT138-600D,127 requires heatsink mounting per its TO-220AB (SOT78) package definition. Its R_th(j-a) is 60 K/W in free air - insufficient for sustained conduction above ~1 A RMS. Even in low-duty-cycle use, transient thermal limits (e.g., 95 A surge) demand proper heatsinking to avoid junction overheating. BT138-600D,127 must be mounted to a thermally rated heatsink with insulated hardware if T2 is not at system ground potential.

Is BT138-600D,127 compatible with zero-crossing detection circuits?

Yes, BT138-600D,127 supports zero-crossing triggered phase control. Its fast gate-controlled turn-on time (2 µs typical) and low I_GT allow precise synchronization with zero-crossing signals. However, because it is a 4Q device, gate pulses can be applied at any point in the AC cycle - unlike 3Q triacs that require specific polarity alignment. BT138-600D,127 thus simplifies zero-crossing driver design in universal AC controllers.

What is the significance of the mounting base being electrically connected to T2 in BT138-600D,127?

In BT138-600D,127, the TO-220AB mounting base is internally bonded to main terminal 2 (T2). This means the heatsink must be electrically isolated unless T2 is referenced to chassis ground or system common. Failure to insulate may cause short circuits or ground loops. This configuration reduces thermal resistance (R_th(j-mb) = 1.5 K/W) but mandates careful PCB layout and heatsink isolation - a key design consideration for BT138-600D,127 integration.

Does BT138-600D,127 meet RoHS and REACH compliance requirements?

Yes, BT138-600D,127 is manufactured by NXP Semiconductors in accordance with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. The device carries the "127" suffix indicating lead-free, halogen-free, and RoHS-compliant packaging per NXP's product marking convention. BT138-600D,127 is suitable for environmentally regulated markets including the EU, China, and South Korea.