NXP Semiconductors ACTT4X-800C,127

Overview

ACTT4X-800C from NXP Semiconductors is a planar passivated AC thyristor triac power switch in SOT186A (TO-220F) full-pack plastic package, featuring self-protective turn-on during high-energy transients, 800 V repetitive peak off-state voltage, 4 A RMS on-state current, and isolated mounting base for direct heatsink integration in AC motor controls.

For engineers reviewing the ACTT4X-800C datasheet, ACTT4X-800C pinout, ACTT4X-800C application, or ACTT4X-800C equivalent, this device delivers snubberless commutation, IEC 61000-4-5 surge immunity, and three-quadrant triggering - critical for reliable AC load switching in white goods and industrial appliances.

Technical Context

The ACTT4X-800C operates as a bidirectional AC power switch with clamping structure enabling safe 2 kV non-repetitive peak pulse voltage withstand and 850 V clamping voltage at 0.1 mA. Its gate trigger current is 35 mA across all three quadrants (LD+G+, LD+G−, LD−G−), ensuring robust microcontroller interfacing.

It supports snubberless operation with dIcom/dt up to 15 A/ms under low dVcom/dt conditions and achieves 1000 V/µs dVD/dt immunity at 125 °C junction temperature - key for highly inductive loads like reversing induction motors and compressors.

Key Specifications

Pinout & Package

SOT186A (TO-220F) full-pack plastic package with isolated mounting base, single mounting hole, and 3-lead configuration optimized for heatsink-mounted AC power control.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AC thyristor triac applications.

Compared with BTB16-800CW and TT605N16KOF, the ACTT4X-800C uniquely combines 800 V blocking, 4 A RMS rating, integrated transient protection, and isolated TO-220F packaging - making it optimal for compact, safety-certified white goods designs where snubberless operation and heatsink isolation are mandatory.

Availability

ACTT4X-800C is available at Aetrix Electronics and suitable for AC fan control, compressor drive, and reversing motor applications requiring stable component supply, long-lifecycle support, and compliance with IEC 61000-4-5 surge immunity standards.

Supply support for ACTT4X-800C 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 ACTT4X-800C belongs to NXP's AC Thyristor Triac family, engineered specifically for robust, snubberless AC power switching in safety-critical white goods and industrial appliances.

FAQ

What is the maximum junction temperature specification for the ACTT4X-800C?

The ACTT4X-800C has a maximum junction temperature (Tj) of 125 °C, as defined in its limiting values table. This rating enables reliable operation in enclosed appliance environments when paired with appropriate heatsinking - for example, maintaining Th ≤94 °C ensures full 4 A RMS current capability per Figure 1 and Figure 2 in the datasheet. The ACTT4X-800C must not be operated beyond this thermal limit to avoid permanent degradation.

Does the ACTT4X-800C support four-quadrant triggering?

No, the ACTT4X-800C triggers only in three quadrants (QI, QII, and QIII), as explicitly stated in section 1.2 of the datasheet. It does not support QIV triggering (LD− G+), which enhances noise immunity and reduces EMI compared to full four-quadrant triacs. This design choice directly supports its use in high-noise environments like compressor and pump controls where false turn-on must be minimized - a key feature of the ACTT4X-800C.

What isolation voltage does the mounting base of the ACTT4X-800C provide?

The mounting base of the ACTT4X-800C provides 2500 V RMS isolation voltage (Visol(RMS)) between all pins and the external heatsink, tested at 50–60 Hz under clean, dust-free conditions. This certified isolation allows direct mechanical attachment to grounded heatsinks without additional insulating hardware - a critical enabler for compact, safety-compliant designs in Class I appliances where creepage and clearance constraints apply. The ACTT4X-800C meets this spec per Table 6 of the datasheet.

Can the ACTT4X-800C operate without an external snubber circuit?

Yes, the ACTT4X-800C is designed for snubberless operation, validated up to 15 A/ms dIcom/dt under low dVcom/dt conditions (1 V/µs). Its high dVD/dt immunity (1000 V/µs at 125 °C) and self-protective clamping behavior eliminate the need for external RC snubbers in typical inductive load applications such as fans and compressors - reducing component count and improving system reliability. This capability is intrinsic to the ACTT4X-800C's architecture.

What is the gate trigger voltage range for the ACTT4X-800C at room temperature?

At Tj = 25 °C, the ACTT4X-800C exhibits a gate trigger voltage (VGT) range of 0.8 V to 1.5 V, as specified in Table 7. This low-voltage threshold enables direct interfacing with standard 3.3 V and 5 V microcontrollers without level-shifting circuitry. The ACTT4X-800C maintains functional gate sensitivity even at elevated temperatures, with minimum VGT dropping to 0.2 V at 125 °C - ensuring robust triggering across its full operating range.