NXP Semiconductors TDA3629/YWU

Overview

TDA3629/YWU 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 with shutdown at ~160 °C junction temperature.

For engineers reviewing the TDA3629/YWU datasheet, TDA3629/YWU pinout, TDA3629/YWU application, or TDA3629/YWU equivalent, this page provides verified functional specifications, DIP8 package mapping, automotive-grade transient immunity data (ISO/DIS 11452-compliant), and validated alternative options for headlight leveling systems requiring robust fault detection and brake-on-stop behavior.

Technical Context

The TDA3629/YWU operates as a closed-loop analog comparator-based controller: it compares voltage from a dashboard-mounted setting potentiometer (SET) against feedback from a motor-coupled potentiometer (FB), then drives dual H-bridge outputs (OUT1/OUT2) to rotate or brake the DC positioning motor. Its core timing relies on two reference current thresholds (6–12 µA switch-on, ~2.5 µA switch-off) and internal flip-flops preserving output state during battery transients.

Protection architecture includes under-voltage lockout (6–8 V), over-voltage shutdown (17.5–22.8 V), thermal foldback above ~160 °C, and dedicated SET-line fault detection-broken ground (ΔVSET ≤ 160 mV), short-to-battery (VSET = VP), and short-to-ground (VSET ≤ 1 V)-all triggering motor stop and brake activation.

Key Specifications

Pinout & Package

Package: DIP8 (SOT97-1), plastic dual in-line, 300-mil width, through-hole mount. Thermal resistance R_{th j-amb} = 100 K/W in free air.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA3629/YWU, TDA3629T offers identical control functionality in SO16 but trades thermal performance for board-space savings, while UC2625N demands significant external circuitry to replicate even basic TDA3629/YWU features-making both alternatives less optimal for drop-in automotive headlight leveling.

Availability

TDA3629/YWU is available at Aetrix Electronics and suitable for automotive lighting systems, headlight leveling modules, and commercial vehicle compliance designs requiring stable component supply, long lifecycle support, and AEC-Q100-adjacent reliability validation.

Supply support for TDA3629/YWU 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 analog power and signal conditioning ICs inherited from Philips.

The TDA3629/YWU belongs to NXP's legacy automotive analog controller family, specifically engineered for electromechanical headlight beam positioning-emphasizing fault resilience, analog precision, and direct potentiometer interface without microcontroller dependency.

FAQ

What is the primary function of the TDA3629/YWU in automotive lighting systems?

The TDA3629/YWU is a dedicated light position controller IC that automatically adjusts headlight vertical beam elevation in passenger cars. It reads position commands from a dashboard potentiometer (SET input), compares them with mechanical feedback (FB input), and drives a DC motor via OUT1/OUT2 outputs using an on-off hysteresis strategy. The TDA3629/YWU also implements brake-on-stop, thermal foldback, and SET-line fault detection-ensuring safe, accurate, and maintenance-free beam alignment without software or external supervision.

Does the TDA3629/YWU require external components to operate in a standard headlight leveling application?

Yes, the TDA3629/YWU requires external passive components for reliable operation: a reverse-polarity protection diode on VP, decoupling capacitors (e.g., 47 µF low-ESR electrolytic + 100 nF ceramic), series resistors on SET and FB lines (≥2 kΩ each), and optional EMC filters per Fig.10. These are not optional extras-they enable transient immunity, fault detection accuracy, and thermal stability. The TDA3629/YWU itself contains no internal charge pumps, regulators, or memory; all timing and thresholds depend on these external elements.

How does the TDA3629/YWU detect a broken ground wire on the SET potentiometer?

The TDA3629/YWU detects broken ground on the SET potentiometer by monitoring the voltage difference ΔVSET between normal operation and open-ground condition. Under test conditions (Vb = 16 V, RSET = 20 kΩ), ΔVSET is guaranteed ≤160 mV. If the ground wire opens, VSET rises significantly-exceeding the 2.5 µA switch-off threshold and causing immediate motor stop and brake activation. This behavior is confirmed in Fig.6 and Note 3 of the characteristics table, and is intrinsic to the TDA3629/YWU's internal comparator architecture-not dependent on external circuitry.

What are the absolute maximum ratings for supply voltage and junction temperature on the TDA3629/YWU?

The TDA3629/YWU has an absolute maximum supply voltage of −0.3 V to +50 V (non-operating) and 8–18 V (operating). Its virtual junction temperature (Tvj) must remain between −50 °C and +150 °C per IEC 747-1. Exceeding +150 °C triggers irreversible thermal shutdown; sustained operation above +105 °C ambient requires strict derating per Table 1 (e.g., 300 s pause after 8 s motor-on time at 105 °C). These limits are measured and validated per the "Limiting Values" section (page 7) and "Thermal aspects" (page 12) of the official datasheet.

Can the TDA3629/YWU be used in dual-headlight (left/right) configurations without additional logic?

Yes, the TDA3629/YWU supports stereo operation natively: two TDA3629/YWU ICs can share a single dashboard potentiometer (SET input), with independent FB inputs and motor outputs. The datasheet explicitly addresses fault propagation-e.g., if one module loses battery or ground, the other continues regulating, though with altered SET voltage due to loading. No external logic, multiplexers, or synchronization circuitry is needed. This capability is documented in the "Stereo operation" section (page 13) and validated in Fig.10's dual-module schematic.