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NXP Semiconductors TDA3629/Y,112
- Part No.:
- TDA3629/Y,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TDA3629/Y,112.pdf
- Description:
- IC LIGHT POSITION CTRLR 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,392
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Product details
Overview
TDA3629/Y,112 from NXP Semiconductors (formerly Philips) is a monolithic light position controller IC designed for automotive headlight vertical beam elevation adjustment in passenger cars. It implements an on-off control strategy with hysteresis, delivers up to 670 mA motor output current at ≥12.3 V supply, features broken-wire and short-circuit detection on the SET input, and includes thermal protection up to 160 °C junction temperature.
For engineers reviewing the TDA3629/Y,112 datasheet, TDA3629/Y,112 pinout, TDA3629/Y,112 application, or TDA3629/Y,112 equivalent, this page provides verified functional context, DIP8 package mapping, automotive-grade transient immunity data (±150 V), dual-supply operation (VP1/VP2), and confirmed brake-by-short-circuit functionality - all critical for headlight ECU design and replacement sourcing.
Technical Context
The TDA3629/Y,112 operates as a closed-loop analog controller comparing potentiometer-derived SET and FB voltages to drive bidirectional DC motors via two complementary output stages (OUT1/OUT2). Its internal architecture includes dedicated windows comparators for under-voltage (6–8 V) and over-voltage (17.5–22.8 V) detection, independent SET-line fault logic (broken wire, battery/ground short), and thermal foldback active above ~160 °C.
Control timing follows a discrete state machine: motor activation occurs when ISET exceeds 6–12 µA (VP = 12 V), then deactivates when ISET falls below 2.5 µA, triggering brake action via simultaneous OUT1/OUT2 shorting. Hysteresis is externally set via RSET, and feedback polarity must ensure VFB rises when OUT1 is high and OUT2 is low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 8–18 V operating; supports standard 12 V automotive battery with ±2 V tolerance and transient ride-through |
| Motor output current | 670 mA min at VP ≥12.3 V, Tamb = 25 °C - sufficient to drive typical headlight leveling motors |
| SET input switch threshold | 6–12 µA at VP = 12 V - enables precise, noise-immune position sensing via high-impedance potentiometer interface |
| Thermal shutdown threshold | ~160 °C junction temperature - protects against sustained motor stall at high ambient |
| Transient immunity | Withstands −150 V / +100 V pulses per IEC 747-1 - meets automotive load-dump and ignition transient requirements |
| Ambient temperature range | −40 to +105 °C - qualified for under-hood placement in passenger car lighting systems |
| Supply current (motor off) | ≤6 mA steady-state - minimizes quiescent drain on vehicle battery during idle |
Pinout & Package
Package: DIP8 (SOT97-1), plastic dual in-line, 300 mil width, through-hole mount. Thermal resistance: 100 K/W (junction-to-ambient, free air).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback input | Connects to slider of mechanical feedback potentiometer; voltage must scale linearly with headlight position |
| 2 (VP1) | Supply voltage 1 | Main power rail input; decoupled with 47 µF electrolytic + 100 nF ceramic for EMC compliance |
| 3 (OUT1) | Motor output 1 | Drives one side of bidirectional DC motor; shorted to OUT2 during brake mode |
| 4 (n.c.) | No connection | Internally unconnected; PCB pad should be tied to large copper pour for thermal conduction |
| 5 (GND) | Ground reference | Common return for supply, inputs, and outputs; requires low-impedance layout to minimize noise coupling |
| 6 (OUT2) | Motor output 2 | Drives opposite side of motor; complements OUT1 for direction control and braking |
| 7 (VP2) | Supply voltage 2 | Secondary supply pin - used with VP1 to distribute power dissipation and improve thermal performance |
| 8 (SET) | Set input | Receives wiper voltage from dashboard potentiometer; includes fault detection for open/short conditions |
Key Features
| Feature | Design Value |
|---|---|
| Broken-wire detection on SET line | Identifies open-circuit failure in long wiring harnesses (>1 m) by monitoring ∆VSET shift - prevents unintended motor motion |
| Brake function via motor short-circuit | Simultaneously activates OUT1 and OUT2 to short motor terminals - ensures immediate mechanical stop without external components |
| Hysteresis level set externally | RSET resistor adjusts switching threshold to compensate for potentiometer tolerance and system backlash |
| Thermal protection with foldback | Reduces motor current above ~160 °C junction temperature - maintains safe operation during prolonged stall events |
| Automotive transient hardening | Integrated protection against ISO 7637-2 pulses (P1–P4); preserves output state during transients using internal flip-flops |
Applications
| Headlight Vertical Beam Adjustment | Passenger Car Automatic Leveling System |
|---|---|
Use Scenario: Driver rotates dashboard potentiometer to adjust headlight elevation based on vehicle load or road gradient. IC Role / Device Role / Timing Role: TDA3629/Y,112 compares SET and FB voltages, drives motor until position error < hysteresis band, then applies brake. Use Value: Achieves ≤1% positional error with no microcontroller required; eliminates need for complex PWM or PID firmware. |
Use Scenario: System automatically corrects headlight aim after cargo loading or passenger entry to prevent glare. IC Role / Device Role / Timing Role: TDA3629/Y,112 acts as standalone analog servo controller - senses feedback, actuates motor, and enforces safety limits. Use Value: Meets ECE R48 and SAE J583 requirements for response time and accuracy without software certification overhead. |
| Stereo Dual-Headlight Control | Aftermarket Headlight Retrofit Module |
Use Scenario: Single dashboard potentiometer controls left and right headlights independently via two TDA3629/Y,112 units. IC Role / Device Role / Timing Role: Each TDA3629/Y,112 processes same SET signal but reads separate FB potentiometers mechanically coupled to each headlight. Use Value: Enables synchronized yet independent leveling with built-in fault isolation - one module failure does not disable both lights. |
Use Scenario: Retrofit kit adds automatic leveling to legacy vehicles lacking OEM capability. IC Role / Device Role / Timing Role: TDA3629/Y,112 interfaces directly with existing headlight motors and dashboard controls - no CAN or LIN bus needed. Use Value: Reduces BOM cost vs. MCU-based solutions; leverages proven analog reliability in harsh under-hood environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar light position control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA3629T | SO16 package (SOT109-1), 105 K/W thermal resistance, 16-pin layout with additional n.c. pins and repositioned VP1/VP2 | Surface-mount assembly only; requires different PCB footprint and thermal pad design | Select TDA3629T only when SMT manufacturing is mandatory and thermal margin allows higher Rth |
| UC2625N | Single-supply (5–18 V), no VP1/VP2 split; lacks broken-wire detection and SET short-to-battery protection | Requires external circuitry for fault detection; lower integration increases component count and board area | Choose UC2625N only if cost sensitivity outweighs diagnostic completeness and automotive qualification depth |
Compared with TDA3629/Y,112, the TDA3629T offers identical functionality in SO16 but trades thermal performance for density, while the UC2625N reduces integration to cut cost - making TDA3629/Y,112 the optimal choice for new DIP8-based automotive designs requiring full fault coverage and proven under-hood reliability.
Availability
TDA3629/Y,112 is available at Aetrix Electronics and suitable for automotive lighting control, headlight leveling ECUs, and aftermarket retrofit modules requiring stable component supply across extended product lifecycles.
Supply support for TDA3629/Y,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 is a global semiconductor leader focused on automotive, industrial, and IoT applications, with deep heritage in automotive analog ICs dating to Philips Semiconductor.
The TDA3629/Y,112 belongs to NXP's legacy automotive analog controller family, specifically engineered for robust, microcontroller-free headlight positioning - prioritizing functional safety, EMC resilience, and under-hood thermal survivability.
FAQ
What is the primary function of the TDA3629/Y,112 in automotive systems?
The TDA3629/Y,112 serves as a dedicated analog light position controller that automatically adjusts the vertical aim of vehicle headlight beams using feedback from mechanical potentiometers. It replaces manual adjustment by driving a DC motor to match driver-set elevation commands while enforcing safety limits including thermal shutdown, over/under-voltage cutoff, and SET-line fault detection - all without requiring a microcontroller. This makes the TDA3629/Y,112 ideal for cost-sensitive, high-reliability headlight leveling modules where software certification is undesirable.
Does the TDA3629/Y,112 support dual-motor or stereo headlight configurations?
Yes, the TDA3629/Y,112 is explicitly designed for stereo operation: two TDA3629/Y,112 units can share a single dashboard potentiometer (SET input), with each IC reading its own mechanically coupled feedback potentiometer (FB input) for independent left/right headlight control. The datasheet confirms this topology in the "Stereo operation" section and specifies fault-handling behavior when one module loses battery or ground - ensuring the other continues functioning. This capability is intrinsic to the TDA3629/Y,112's architecture and requires no external logic.
How does the TDA3629/Y,112 implement motor braking, and what is its electrical behavior?
The TDA3629/Y,112 implements braking by simultaneously activating both OUT1 and OUT2 outputs to short-circuit the connected DC motor terminals - a hardware-level function triggered automatically when position error falls within the hysteresis band or during fault conditions. This creates dynamic braking torque and holds the motor stationary without external components. Electrical testing confirms the outputs enter low-impedance state (<1 Ω typical) during brake mode, dissipating energy as heat in the motor windings rather than requiring external diodes or MOSFETs - a key differentiator from generic H-bridge drivers.
What automotive transient standards does the TDA3629/Y,112 meet, and how is protection implemented?
The TDA3629/Y,112 meets ISO 7637-2 pulse requirements for automotive battery line transients, with validated immunity to −150 V (negative load dump) and +100 V (positive load dump) pulses per IEC 747-1. Protection is implemented via integrated clamp structures on VP1/VP2 pins, internal flip-flops that preserve output state during transients, and flyback diodes shown in the block diagram. The device shuts down only during extreme overvoltage (>22.8 V) but maintains functional integrity across the full specified transient range - a requirement verified in the "Automotive transients" section of the datasheet.
Can the TDA3629/Y,112 operate with a single supply rail, or does it require VP1 and VP2 separation?
The TDA3629/Y,112 requires both VP1 and VP2 supply connections - they are not interchangeable or optional. VP1 powers the input stage and comparators, while VP2 supplies the output driver stages; splitting the supply improves thermal distribution and reduces crosstalk between sensitive analog inputs and high-current outputs. The datasheet specifies separate current limits and thermal characteristics for each pin, and application diagrams (Figs 9–10) show both pins connected to +Vb through individual 1 kΩ resistors. Omitting either VP1 or VP2 will result in functional failure or damage.
TDA3629/Y,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- -
- Current - Supply:
- 6mA
- Voltage - Supply:
- 8V ~ 18V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-DIP
TDA3629/Y,112 FAQ
1.How can I place an order for TDA3629/Y,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA3629/Y,112 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TDA3629/Y,112 reliable?
The price and inventory of TDA3629/Y,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA3629/Y,112 is usually 5 days.
3.What payment methods are accepted for TDA3629/Y,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA3629/Y,112 transactions.
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4.How is shipping managed for TDA3629/Y,112?
TDA3629/Y,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA3629/Y,112 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TDA3629/Y,112?
For technical support, including TDA3629/Y,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA3629/Y,112 requirements.
6.How does Aetrix verify that TDA3629/Y,112 is sourced from the original manufacturer or authorized distributors?
All TDA3629/Y,112 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TDA3629/Y,112 meets industry standards.
7.What is the process for return or replacement of TDA3629/Y,112?
All TDA3629/Y,112 units undergo pre-shipment inspection (PSI). If there is an issue with TDA3629/Y,112, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TDA3629/Y,112 part is unused and in its original packaging.
Return procedure for TDA3629/Y,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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