NXP Semiconductors TDA3629T/YM,118

Overview

TDA3629T/YM,118 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, supports dual supply inputs (VP1/VP2), delivers up to 670 mA output current at 12.3 V, and integrates broken-wire and short-circuit detection on the SET input.

For engineers reviewing the TDA3629T/YM,118 datasheet, TDA3629T/YM,118 pinout, TDA3629T/YM,118 application, or TDA3629T/YM,118 equivalent, this page provides verified functional context, SO16 package mapping, automotive-grade transient immunity data (up to ±138 V), thermal protection behavior, and validated alternative part guidance for headlight leveling systems.

Technical Context

The TDA3629T/YM,118 uses a comparator-based feedback loop with externally adjustable hysteresis via RSET to drive bidirectional DC motors for headlight beam elevation. Its dual-supply architecture (VP1 and VP2) enables independent power routing for logic and output stages, improving noise isolation in automotive environments.

It features integrated protection including under-voltage lockout (6–8 V), over-voltage shutdown (17.5–22.8 V), thermal limiting (~160 °C junction), and SET input fault detection (short-to-battery, short-to-ground, open-wire). Motor braking is implemented by short-circuiting OUT1 and OUT2 when inactive.

Key Specifications

Pinout & Package

Package: SO16 - plastic small outline package, 16 leads, 3.9 mm body width (SOT109-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BD3710FV-E2 and TLE4207-2G, the TDA3629T/YM,118 uniquely integrates full closed-loop control, dual-supply isolation, and comprehensive wiring fault detection-making it the sole drop-in solution for OE headlight leveling without architectural redesign.

Availability

TDA3629T/YM,118 is available at Aetrix Electronics and suitable for automotive lighting systems, headlight leveling modules, and OEM replacement programs requiring stable component supply across extended product lifecycles.

Supply support for TDA3629T/YM,118 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 leader focused on automotive, industrial, and IoT applications, with deep heritage in automotive analog and power ICs inherited from Philips.

The TDA3629T/YM,118 belongs to NXP's automotive analog controller family, engineered specifically for electromechanical headlight beam positioning-emphasizing robustness, fault resilience, and seamless integration into vehicle electrical architectures.

FAQ

What is the primary function of the TDA3629T/YM,118 in automotive systems?

The TDA3629T/YM,118 functions as a dedicated light position controller that automatically adjusts headlight beam elevation in passenger cars. It reads driver input from a dashboard potentiometer (SET), compares it against mechanical feedback (FB), and drives a DC motor to align the headlight-while providing real-time fault detection and thermal protection. Its design eliminates need for microcontroller-based control in basic leveling systems.

Does the TDA3629T/YM,118 support dual power supplies, and why is this important?

Yes, the TDA3629T/YM,118 has two independent supply inputs: VP1 powers internal logic and comparators, while VP2 powers the output driver stage. This separation prevents motor switching noise from corrupting sensitive analog feedback signals-critical for stable closed-loop operation in electrically noisy automotive environments. The SO16 pinout allocates dedicated pins (5 and 12) to maintain this isolation.

How does the TDA3629T/YM,118 detect a broken wire on the SET input?

The TDA3629T/YM,118 detects SET wire breakage by monitoring voltage differential across the setting potentiometer. When the ground connection opens, the SET node voltage shifts by up to 160 mV (ΔVSET) relative to normal operation-triggering internal protection that disables motor drive and activates braking. This feature is explicitly characterized in the datasheet (Note 3, page 8) and requires RSET ≥20 kΩ for reliable operation.

What are the absolute maximum ratings for voltage transients on the VP supply pins of the TDA3629T/YM,118?

The TDA3629T/YM,118 is rated for voltage transients of −150 V to +100 V on the VP supply line (Vb), per IEC 747-1 and tested per ISO/DIS 11452. These limits correspond to worst-case automotive events like load dump (positive) and ignition-induced spikes (negative). During such transients, the device shuts down safely-preserving output state via internal flip-flops-and resumes operation once VP returns within 8–18 V operating range.

Can the TDA3629T/YM,118 be used in stereo headlight configurations with a single SET potentiometer?

Yes, the TDA3629T/YM,118 is explicitly designed for stereo operation: two units can share one dashboard SET potentiometer, with each controlling left or right headlight independently. The datasheet (page 13) details fault implications-e.g., if one module loses battery or ground, the other continues regulating-but emphasizes that RSET must be sized to avoid loading-induced voltage drop that could skew both channels' setpoints.