NXP Semiconductors TDA3629T/YM,112

Overview

TDA3629T/YM,112 from NXP Semiconductors (formerly Philips) is a monolithic light position controller IC designed for automotive headlight elevation adjustment in passenger cars. It implements an on-off motor control strategy with hysteresis, delivers up to 670 mA output current at 12.3 V supply, features broken-wire and short-circuit detection on the SET input, and integrates thermal protection up to 160 °C junction temperature - enabling precise, fail-safe beam leveling via dashboard potentiometer.

For engineers reviewing the TDA3629T/YM,112 datasheet, TDA3629T/YM,112 pinout, TDA3629T/YM,112 application, or TDA3629T/YM,112 equivalent, this page provides verified functional context, validated SO16 pin mapping, automotive-grade transient immunity data (±150 V), dual-supply voltage monitoring (6–18 V operating range), and real-world design implications for headlight control systems requiring ISO 11452-compliant EMC robustness.

Technical Context

The TDA3629T/YM,112 uses a comparator-based on-off control architecture with externally adjustable hysteresis, where motor activation occurs when ISET exceeds 6–12 µA (VP = 12 V) and deactivation occurs at ~2.5 µA. Its dual-supply inputs (VP1 and VP2) enable independent monitoring of battery line integrity and over/under-voltage shutdown thresholds (6–8 V under-voltage, 17.5–22.8 V over-voltage).

Internal protection includes thermal foldback above ~160 °C, SET input fault detection (open-circuit, short-to-battery, short-to-ground), and transient suppression per worst-case automotive pulses (−138 V / +112 V, 100 µs–10 ms). Output stages drive bidirectional DC motors via OUT1/OUT2 with saturation voltage ≤2.9 V drop at 700 mA load.

Key Specifications

Pinout & Package

Package: SO16 plastic small outline package (SOT109-1), 3.9 mm body width, 16-pin surface-mount. Designed for automotive PCB layouts with thermal pad grounding and transient filtering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BD3710FV and TLE4207-2G, the TDA3629T/YM,112 delivers complete analog closed-loop functionality in one package - eliminating external components for position comparison, fault detection, and brake control - making it uniquely suited for standalone, ASIL-B-aligned headlight leveling without software dependency.

Availability

TDA3629T/YM,112 is available at Aetrix Electronics and suitable for automotive lighting systems, headlight leveling modules, and OEM replacement assemblies requiring stable component supply across extended product lifecycles and stringent AEC-Q100-aligned manufacturing traceability.

Supply support for TDA3629T/YM,112 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, formerly Philips Semiconductors, is a global leader in automotive ICs, with deep expertise in power management, signal conditioning, and safety-critical analog control solutions.

The TDA3629T/YM,112 belongs to NXP's legacy automotive analog controller family, specifically engineered for electromechanical headlight beam adjustment - prioritizing fault resilience, thermal robustness, and direct potentiometer interfacing without microcontroller intervention.

FAQ

What is the primary function of the TDA3629T/YM,112 in automotive systems?

The TDA3629T/YM,112 functions as a dedicated light position controller that automatically adjusts headlight beam elevation based on driver input via a dashboard potentiometer. It compares the SET (command) and FB (mechanical feedback) voltages, drives a bidirectional DC motor through OUT1/OUT2, and incorporates built-in diagnostics - all without requiring a microcontroller. This makes the TDA3629T/YM,112 ideal for ASIL-B-compliant headlight leveling where deterministic analog control is preferred over software-based solutions.

Does the TDA3629T/YM,112 support dual-supply monitoring, and why is it important?

Yes, the TDA3629T/YM,112 features two independent supply inputs: VP1 and VP2. VP1 powers the core circuitry and triggers under/over-voltage shutdown, while VP2 provides redundant battery line monitoring to detect open-circuit or degraded connections. This dual-supply architecture enhances functional safety by preventing false motor activation due to partial wiring faults - a critical requirement for automotive lighting systems governed by ISO 26262 and ECE R112.

How does the TDA3629T/YM,112 handle motor braking, and what is its design impact?

The TDA3629T/YM,112 implements hardware-enforced motor braking by internally short-circuiting the motor terminals (OUT1 and OUT2) whenever the motor is inactive. This eliminates coasting and ensures immediate, repeatable stopping - essential for precise beam positioning. Unlike software-controlled PWM braking, this analog method requires no timing-critical firmware, reduces system latency, and remains fully operational even during microcontroller resets or communication failures.

What fault conditions does the SET input of the TDA3629T/YM,112 detect, and how are they signaled?

The SET input of the TDA3629T/YM,112 detects three distinct fault conditions: broken wire (open-circuit), short-to-battery, and short-to-ground. Detection occurs via current thresholds - e.g., ISET < 2.5 µA indicates open-circuit, >12 µA at VP suggests short-to-battery, and VSET < 1 V triggers short-to-ground shutdown. When any fault is detected, the TDA3629T/YM,112 disables motor outputs and activates the brake, ensuring fail-safe behavior mandated for automotive lighting control.

Is the TDA3629T/YM,112 compliant with automotive electromagnetic compatibility standards?

Yes, the TDA3629T/YM,112 was tested per ISO/DIS 11452-1 and -7 for immunity to narrowband RF disturbances. It withstands RMS RF injection levels up to 15 V from 5 MHz to 1 GHz when applied to the control path (RFC), with verified performance at 30–70% feedback voltage settings. This compliance ensures reliable operation in electrically noisy vehicle environments - including proximity to ignition systems, alternators, and infotainment RF sources - without spurious motor activation or lockup.