NXP Semiconductors BT1306-400D,412

Overview

BT1306-400D from NXP Semiconductors is a logic-level sensitive-gate triac designed for direct interfacing with microcontrollers and low-power gate drive circuits. It supports bidirectional AC switching up to 400 V repetitive peak off-state voltage (VDRM), delivers 0.6 A RMS on-state current (IT(RMS)), and features quadrant-sensitive triggering with IGT ≤ 5 mA in all four modes - enabling compact, low-component-count phase control in cost-sensitive consumer and industrial systems.

For engineers reviewing the BT1306-400D datasheet, BT1306-400D pinout, BT1306-400D application, or BT1306-400D equivalent, key selection criteria include its TO-92 (SOT54) through-hole package, 8 A non-repetitive surge rating (ITSM), 1.4–1.9 V on-state voltage (VT), and compatibility with 3.3 V/5 V logic-level gate drive without external amplification.

Technical Context

The BT1306-400D operates as a bidirectional thyristor with fully sensitive gate operation across all four quadrants (T2+/G+, T2+/G−, T2−/G−, T2−/G+), allowing triggering with low gate current (IGT ≤ 5 mA) regardless of main terminal polarity. Its design eliminates need for gate resistors or level-shifting circuitry when driven by standard CMOS/TTL outputs.

It exhibits critical dVD/dt immunity of 30–45 V/μs at 110 °C and holds latching current (IL) ≤ 10 mA and holding current (IH) ≤ 10 mA - ensuring reliable turn-on and stable conduction under varying load and temperature conditions typical in fan speed control and solid-state relay applications.

Key Specifications

Pinout & Package

BT1306-400D uses the TO-92 (SOT54) plastic single-ended leaded through-hole package - 3-pin, axial-leaded, with standardized 2.54 mm lead pitch and 14.5 mm overall length. Leads are tinned and suitable for wave or hand soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BT1306-400D, BT131-600D trades gate sensitivity for higher voltage robustness, while MAC97A6 offers higher current capacity at the expense of reduced dVD/dt immunity and gate sensitivity - making BT1306-400D optimal for logic-level-driven, noise-sensitive, 120 VAC phase control where minimal component count is critical.

Availability

BT1306-400D is available at Aetrix Electronics and suitable for AC fan speed controllers, solid-state relays, and phase-controlled dimmers requiring stable component supply, long-term manufacturability, and RoHS-compliant through-hole sourcing.

Supply support for BT1306-400D 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 BT1306-400D belongs to NXP's logic-level triac family, engineered specifically for cost-sensitive, low-power AC control applications where direct microcontroller interfacing and quadrant-insensitive triggering are essential design requirements.

FAQ

What is the maximum junction temperature rating for BT1306-400D?

The BT1306-400D has a maximum junction temperature (Tj) rating of +125 °C, as specified in the Absolute Maximum Ratings table. This limit must not be exceeded during operation; thermal design must account for Rth(j-lead) = 60 K/W and ambient conditions to ensure reliable long-term performance of the BT1306-400D.

Can BT1306-400D be directly driven by a 3.3 V microcontroller GPIO pin?

Yes - the BT1306-400D features logic-level sensitivity with IGT ≤ 5 mA across all quadrants and VGT ≤ 2.0 V, enabling direct drive from 3.3 V or 5 V MCU outputs without external amplification. Gate resistor selection must ensure IG ≥ 5 mA under worst-case VGS and temperature conditions to guarantee reliable triggering of the BT1306-400D.

What is the difference between BT1306-400D and BT1306-600D?

The primary difference is repetitive peak off-state voltage: BT1306-400D is rated for VDRM ≤ 400 V, while BT1306-600D is rated for VDRM ≤ 600 V. All other electrical characteristics - including IT(RMS) = 0.6 A, ITSM = 8 A, package (TO-92/SOT54), and gate sensitivity - are identical between the two variants of the BT1306-400D family.

Does BT1306-400D require a snubber circuit in typical phase-control applications?

A snubber is recommended for inductive loads (e.g., motors) to suppress voltage transients exceeding the 400 V VDRM rating. The BT1306-400D's dVD/dt rating of 30–45 V/μs provides inherent noise immunity, but RC snubbers remain advisable for reliability in fan or transformer-driven applications to prevent false triggering and ensure robust commutation of the BT1306-400D.

Is BT1306-400D suitable for zero-crossing switching applications?

No - the BT1306-400D is optimized for phase-angle control, not zero-crossing switching. It lacks integrated zero-crossing detection and relies on external timing circuitry. For true zero-crossing operation, a dedicated zero-crossing triac driver IC (e.g., MOC3041 + BT1306-400D) is required; the BT1306-400D itself functions only as the power switching element.