NXP Semiconductors TDA3629T/YM/WJ

Overview

TDA3629T/YM/WJ from NXP Semiconductors (formerly Philips) is a monolithic light position controller IC designed for automotive headlight elevation control in passenger cars. It implements an on-off motor control strategy with hysteresis, delivers ±670 mA output current at 12.3 V supply, supports 8–18 V operating voltage, and integrates broken-wire/short-circuit detection on the SET input for dashboard potentiometer interfaces.

For engineers reviewing the TDA3629T/YM/WJ datasheet, TDA3629T/YM/WJ pinout, TDA3629T/YM/WJ application, or TDA3629T/YM/WJ equivalent, this page provides verified functional identity, automotive-grade thermal and transient immunity specs, SO16 package mapping, confirmed motor brake behavior via output short-circuiting, and two validated alternative controllers for headlight leveling systems.

Technical Context

The TDA3629T/YM/WJ uses dual-window comparators with externally set hysteresis to drive bidirectional DC motors via complementary OUT1/OUT2 outputs. Its SET input monitors a dashboard potentiometer wiper voltage (1.5–0.95V_P) and triggers motor activation when I_SET exceeds 6–12 µA; motor stops when I_SET falls below 2.5 µA, engaging brake by short-circuiting the motor terminals.

It incorporates under-voltage (6–8 V) and over-voltage (17.5–22.8 V) lockout, thermal shutdown at ~160 °C, and automotive transient protection against ±150 V pulses per ISO/DIS 11452. Feedback is provided via FB input connected to a mechanically coupled potentiometer, with differential output voltage maintained below 100 mV during stable positioning.

Key Specifications

Pinout & Package

Package: SO16 plastic small outline package (3.9 mm body width, SOT109-1), surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar light position controller applications.

Compared with the TDA3629T/YM/WJ, the L99LD01 shifts intelligence to a host MCU and adds digital communication, while the BTS716G offloads all control logic externally-neither replicates the TDA3629T/YM/WJ's self-contained analog positioning with integrated fault detection and brake functionality.

Availability

TDA3629T/YM/WJ is available at Aetrix Electronics and suitable for automotive headlight leveling systems, OE replacement modules, and aftermarket retrofit kits requiring stable component supply across extended temperature ranges and high-reliability automotive environments.

Supply support for TDA3629T/YM/WJ 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in automotive analog and power ICs.

The TDA3629T/YM/WJ belongs to NXP's legacy automotive analog controller product line, engineered specifically for electromechanical headlight leveling systems requiring robustness, simplicity, and fail-safe operation without microcontroller dependency.

FAQ

What is the primary function of the TDA3629T/YM/WJ in automotive systems?

The TDA3629T/YM/WJ functions as a standalone light position controller that automatically adjusts headlight beam elevation based on driver input via a dashboard potentiometer. It compares the SET input (from the setting potentiometer) with the FB input (from a mechanically coupled feedback potentiometer), drives a bidirectional DC motor to minimize error, and applies a short-circuit brake when positioning is complete. This enables precise, self-contained headlight leveling without requiring a microcontroller or software.

Does the TDA3629T/YM/WJ support both DIP8 and SO16 packages?

No-the TDA3629T/YM/WJ designation specifically identifies the SO16 package variant (SOT109-1). The original TDA3629 is the DIP8 version (SOT97-1). Pin numbering, thermal resistance (105 K/W vs. 100 K/W), and PCB layout differ between packages; they are not interchangeable without board redesign. The "T" suffix in TDA3629T confirms the SO16 form factor.

How does the TDA3629T/YM/WJ detect a broken wire on the SET input?

The TDA3629T/YM/WJ detects a broken ground connection on the SET potentiometer using a dedicated broken-wire circuit. When the ground wire opens, the SET node voltage rises due to internal pull-up, creating a measurable ∆V_SET of up to 160 mV above normal operating voltage. If this threshold is exceeded, the device disables motor output and maintains brake state-preventing uncontrolled movement and alerting the system to the fault condition.

What is the maximum continuous motor current the TDA3629T/YM/WJ can deliver?

At 13 V supply and ambient temperature ≤105 °C, the TDA3629T/YM/WJ supports up to 220 mA continuous motor current during active periods, based on its SO16 package thermal limit of 0.67 W maximum dissipation. Peak current capability remains 670 mA for short durations (e.g., startup), but sustained operation above 220 mA risks thermal shutdown. Designers must size the motor and duty cycle accordingly.

Is the TDA3629T/YM/WJ compliant with automotive EMC standards?

Yes-the TDA3629T/YM/WJ was validated per ISO/DIS 11452 for immunity to narrowband electromagnetic disturbances up to 1 GHz. Test results show ≥15 V RMS immunity on the control path (RFC injection point) across 5–1000 MHz, meeting OEM requirements for headlight control modules. Its internal protection circuits-including transient clamping and filtered inputs-support robust operation in noisy automotive electrical environments.