NXP Semiconductors BTA208-600D,127

Overview

BTA208-600D from NXP Semiconductors is a planar passivated three-quadrant (3Q) high-commutation triac in TO-220AB (SOT78) package, rated for 600 V repetitive peak off-state voltage, 8 A RMS on-state current, and 65 A non-repetitive peak on-state current. It features very sensitive gate triggering (≤5 mA max in all three quadrants), enabling direct interfacing with microcontrollers and low-power logic ICs in AC power control circuits.

For engineers reviewing the BTA208-600D datasheet, BTA208-600D pinout, BTA208-600D application, or BTA208-600D equivalent, key selection considerations include its 3Q architecture for noise immunity, gate sensitivity at logic-level drive, high dV/dt immunity (20 V/µs), commutation robustness (dIcom/dt ≥2 A/ms), and thermal resistance of 2 K/W junction-to-mounting-base - critical for thermally constrained motor and heating control designs.

Technical Context

The BTA208-600D implements a three-quadrant triggering architecture that excludes Q1 (T2+, G+) operation under standard conditions, improving noise immunity versus four-quadrant triacs. Its planar passivation ensures voltage ruggedness up to 600 V VDRM and stable performance across -40 °C to 125 °C junction temperature range.

It delivers high commutation capability with minimum dIcom/dt of 2 A/ms at 125 °C and dV/dt immunity of 20 V/µs at 110 °C, supporting reliable turn-off in inductive loads. Gate trigger current remains ≤5 mA across all three active quadrants (T2+ G−, T2− G−, T2− G+), enabling compatibility with 3.3 V and 5 V logic without external amplification.

Key Specifications

Pinout & Package

Package: TO-220AB (SOT78), plastic single-ended package with insulated mounting base (T2), 3 leads, heatsink-mountable, 1 mounting hole.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triac-based AC power control applications.

Compared with BTB20-600SL and MAC228A8, the BTA208-600D uniquely balances 600 V rating, 3Q noise immunity, and ≤5 mA gate sensitivity - making it optimal for microcontroller-driven 230/240 VAC thermostats and motor controls where minimal gate drive and high dV/dt immunity are essential.

Availability

BTA208-600D is available at Aetrix Electronics and suitable for electronic thermostats, universal motor speed controllers, and industrial fan regulators requiring stable component supply, long-lifecycle support, and traceable sourcing for production programs.

Supply support for BTA208-600D 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 BTA208-600D belongs to NXP's "Hi-Com Triac" product line, engineered specifically for high-noise-immunity AC power switching in microcontroller-interfaced systems - emphasizing gate sensitivity, commutation robustness, and thermal efficiency in TO-220AB packages.

FAQ

What is the maximum junction temperature specification for the BTA208-600D?

The BTA208-600D has a maximum junction temperature (Tj) rating of 125 °C, as defined in the Absolute Maximum Ratings table. This limit must not be exceeded during operation; thermal design must ensure junction temperature remains at or below this value under worst-case ambient and load conditions. The BTA208-600D datasheet specifies Rth(j-mb) = 2 K/W, enabling accurate junction temperature estimation when mounting base temperature is monitored.

Can the BTA208-600D be directly driven by a 3.3 V microcontroller GPIO pin?

Yes, the BTA208-600D can be directly driven by a 3.3 V microcontroller GPIO pin because its gate trigger voltage (VGT) is as low as 0.25 V at 25 °C and 0.4 V at 125 °C, and its gate trigger current (IGT) is guaranteed ≤5 mA in all three active quadrants. A series current-limiting resistor (e.g., 470 Ω) ensures safe gate power dissipation while delivering sufficient trigger current.

Does the BTA208-600D support four-quadrant triggering?

No, the BTA208-600D is a three-quadrant (3Q) triac and does not support triggering in Quadrant I (T2+, G+). Its datasheet explicitly states triggering occurs in three quadrants only: T2+ G−, T2− G−, and T2− G+. This design enhances noise immunity by eliminating the most noise-sensitive Q1 mode, making it ideal for microcontroller-based AC control in electrically noisy environments.

What is the non-repetitive peak on-state current rating for the BTA208-600D?

The BTA208-600D has a non-repetitive peak on-state current (ITSM) rating of 65 A for a 20 ms sine-wave pulse at Tj(init) = 25 °C. For shorter pulses (e.g., 10 ms), the rating increases to 71 A. This parameter defines the device's ability to withstand short-duration inrush currents - such as those from cold-start universal motors or transformer energization - without damage.

Is heatsinking required for the BTA208-600D at 8 A RMS load current?

Yes, heatsinking is required for the BTA208-600D to sustain 8 A RMS current. The datasheet specifies IT(RMS) = 8 A only when mounting base temperature (Tmb) is held ≤102 °C. With Rth(j-mb) = 2 K/W, even modest heatsinking (e.g., 10 cm² aluminum plate) is necessary to maintain safe junction temperature - especially in enclosed or high-ambient environments. Without heatsinking, continuous current must be significantly derated.