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NXP Semiconductors TDA3618JR/N1C,112
- Part No.:
- TDA3618JR/N1C,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 17-SIP Formed Leads
- Datasheet:
-
TDA3618JR/N1C,112.pdf
- Description:
- IC VOLT REG W/SW & IGNIT 17-SIL
- Quantity:
- Payment:
- Shipping:
Inventory:4,567
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Product details
Overview
TDA3618JR/N1C,112 from NXP Semiconductors (formerly Philips) is a 17-pin automotive-grade multiple-output voltage regulator IC with integrated power switch and dual ignition buffers, designed for car radio systems. It delivers three regulated outputs (9 V, 5 V, 5 V), withstands −18 V reverse polarity and 50 V load dump pulses, and operates across −40 °C to +85 °C ambient temperature.
For engineers reviewing the TDA3618JR/N1C,112 datasheet, TDA3618JR/N1C,112 pinout, TDA3618JR/N1C,112 application, or TDA3618JR/N1C,112 equivalent, this page provides verified functional roles, validated pin-level circuit behavior, confirmed protection thresholds (load dump, thermal shutdown, foldback current limit), and real-world automotive use context - all extracted from the official 2002 Philips specification.
Technical Context
The TDA3618JR/N1C,112 integrates three independent linear regulators (REG1: 9 V/600 mA, REG2: 5 V/150 mA with backup hold, REG3: 5 V/750 mA), a protected high-side power switch (2 A continuous, 3 A peak), and two Schmitt-triggered ignition interfaces - one inverted open-collector (IGN1OUT), one push-pull (IGN2OUT). All regulators feature foldback current limiting and operate under load dump conditions.
Its control architecture uses dedicated enable pins (EN1, EN3, ENSW), battery-supply monitoring (VP threshold: 9.7 V rising / 9.4 V falling), reset delay via external capacitor (CRES), and a shared HOLD output that asserts low on regulator undervoltage, thermal shutdown, or load dump. Regulator 2 remains active during thermal shutdown and load dump to sustain microcontroller operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | −18 V to +50 V - supports reverse polarity protection, jump-start (30 V/10 min), and load dump survival (50 V/50 ms). |
| Regulator 1 output | 9.0 V ±0.5 V at 600 mA - fixed 9 V rail for analog audio stages; drop-out ≤0.7 V at 550 mA. |
| Regulator 2 output | 5.0 V ±0.25 V at 150 mA - microcontroller supply with backup hold; stays active during load dump and thermal shutdown. |
| Regulator 3 output | 5.0 V ±0.25 V at 750 mA - digital logic rail; includes foldback current limit and line/load regulation ≤50 mV. |
| Power switch output | Vdrop ≤0.7 V at 1 A; 2 A continuous / 3 A peak current; clamped to 16 V above 17 V VP - protects downstream loads. |
| Ignition interfaces | IGN1IN: Schmitt trigger (3.25 V rise / 1.05 V fall); IGN1OUT: inverted open-collector; IGN2IN/OUT: non-inverted push-pull with 2.2 V threshold. |
| Thermal & protection | Junction temp limit: +150 °C; thermal hysteresis enabled; ESD-protected pins; short-circuit safe to ground and VP. |
Pinout & Package
Package: DBS17P - plastic DIL-bent-SIL (special bent) power package, 17 leads, lead length 12 mm, heat tab recommended to be connected to ground (SOT475-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VP (1) | Supply input | Battery rail input; withstands −18 V reverse polarity and 50 V load dump; powers all internal circuits. |
| REG1 (2) | Regulator 1 output | 9 V regulated output for analog subsystems; foldback-limited to 1.2 A; stable with ≥220 µF output capacitor. |
| REG3 (3) | Regulator 3 output | 5 V regulated output for digital logic; 750 mA rated; enables via EN3; monitored for HOLD assertion. |
| EN3 (4) | Enable input for REG3 | Active-high Schmitt trigger (1.8 V threshold); disables REG3 and its undervoltage detection when low. |
| IGN2IN (5) | Ignition 2 input | Schmitt-triggered vehicle ignition signal (2.2 V threshold); used to detect engine ON/OFF state. |
| IGN1IN (6) | Ignition 1 input | Inverted ignition sense input (3.25 V rising threshold); triggers active-low IGN1OUT on ignition transition. |
| IGN1OUT (7) | Ignition 1 output | Open-collector, active-low buffer; requires external pull-up; drives microcontroller wake-up or status lines. |
| IGN2OUT (8) | Ignition 2 output | Push-pull, non-inverted output; directly interfaces with CMOS logic without external components. |
| RES (9) | Reset output | Open-collector reset signal; asserted low when REG2 is in regulation; delay set by CRES capacitor. |
| EN1 (10) | Enable input for REG1 | Active-high Schmitt trigger (1.8 V threshold); controls REG1 activation and its contribution to HOLD logic. |
| ENSW (11) | Enable input for power switch | Active-high control for high-side switch; includes delayed short-circuit protection triggered via CRES. |
| HOLD (12) | Hold warning output | Open-collector, active-low; asserts when REG1/REG3 undervolt, thermal shutdown, or load dump occurs. |
| CRES (13) | Reset delay capacitor | External capacitor sets reset delay (35 ms typical @ 47 nF) and power switch foldback timing (17.6 ms typical). |
| GND (14) | Ground reference | Main system ground; heat tab must be connected to GND for thermal performance and EMI control. |
| REG2 (15) | Regulator 2 output | 5 V microcontroller supply; turns on at VP >6.5 V, off at <1.9 V; backed by BU pin for brownout hold. |
| BU (16) | Backup capacitor terminal | Connects external storage capacitor to sustain REG2 during VP dropout; enables controlled MCU shutdown. |
| SW (17) | Power switch output | High-side switched output; 2 A continuous; clamped to 16 V; foldback protection activates after CRES delay. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent regulators | REG1 (9 V), REG2 (5 V, backup-hold capable), REG3 (5 V) - each with dedicated enable, foldback current limit, and undervoltage monitoring. |
| Load dump & reverse polarity resilience | Operates up to 50 V transient and survives −18 V reverse supply - eliminates need for external TVS or polarity protection diodes. |
| Microcontroller support functions | Integrated RES (reset), HOLD (brownout warning), and BU (backup capacitor interface) - enables robust MCU power sequencing and graceful shutdown. |
| Dual ignition interface | IGN1 (inverted open-collector) + IGN2 (non-inverted push-pull) - directly monitors ignition state and signals MCU without level-shifting or external logic. |
| Thermal and short-circuit protection | Internal thermal shutdown with hysteresis; foldback current limiting on all regulators; delayed short-circuit protection on SW with CRES timing. |
| Low-noise, capacitor-stable design | Stable with small output capacitors (e.g., 220 nF + 100 µF); noise as low as 65 µV (REG3, 100 µF); optimized for automotive EMI environments. |
Applications
| Car Radio Power Management | Microcontroller Power Sequencing |
|---|---|
|
Use Scenario: Central power management unit in OEM car radios with analog/digital audio processing and display. IC Role / Device Role / Timing Role: Provides isolated 9 V (analog), 5 V (digital), and 5 V (MCU) rails; coordinates startup/shutdown via RES/HOLD/BU; handles ignition state transitions. Use Value: Eliminates discrete LDOs, reset ICs, and ignition buffers - reduces BOM count by ≥7 components and PCB area by >30%. |
Use Scenario: Ensuring deterministic boot and safe shutdown of 8-bit/16-bit MCUs (e.g., 80C51 derivatives) during battery transients. IC Role / Device Role / Timing Role: REG2 supplies MCU core; RES initiates clean reset; BU sustains operation during VP dip; HOLD warns of impending undervoltage. Use Value: Guarantees MCU retains RAM contents and executes shutdown routines even during 50 ms 50 V load dump events. |
| Automotive Ignition State Detection | Protected High-Side Load Switching |
|
Use Scenario: Detecting vehicle ignition ON/OFF state for head unit wake/sleep control and CAN bus activity coordination. IC Role / Device Role / Timing Role: Dual Schmitt-triggered IGN1IN/IGN2IN inputs with hysteresis filter noisy 12 V battery lines; IGN1OUT/IGN2OUT drive MCU GPIOs directly. Use Value: Removes need for external RC filters, comparators, or optocouplers - improves ignition detection reliability across −40 °C to +85 °C. |
Use Scenario: Switching high-current accessories (e.g., amplifier enable, antenna motor, display backlight) from MCU GPIO. IC Role / Device Role / Timing Role: ENSW-controlled high-side switch delivers 2 A continuously; foldback protection prevents thermal runaway during short-circuit. Use Value: Replaces discrete MOSFET + gate driver + current-sense + protection IC - simplifies layout and improves fault response time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiple-output automotive regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLF4941-2ES | Single 5 V output (500 mA), no REG1/REG3, no ignition buffers, no BU pin; includes watchdog and windowed reset. | Lacks triple-rail capability and ignition interface - suitable only for MCU-only systems without analog/audio sections. | Select when only 5 V MCU supply is needed and system-level ignition sensing is handled externally. |
| MAX16920ATL+T | 9 V/500 mA + 5 V/300 mA dual output; no power switch; no ignition buffers; no backup hold; SPI-configurable. | Missing REG2 backup hold, IGN1/IGN2, and SW - cannot replace full TDA3618JR/N1C,112 functionality in car radio designs. | Consider only for simpler infotainment modules where ignition state is managed by main SoC and backup hold is unnecessary. |
Compared with TLF4941-2ES and MAX16920ATL+T, the TDA3618JR/N1C,112 uniquely integrates triple regulated outputs, dual ignition interfaces, a protected power switch, and microcontroller backup hold - making it irreplaceable in legacy car radio platforms requiring full-featured single-chip power management.
Availability
TDA3618JR/N1C,112 is available at Aetrix Electronics and suitable for automotive infotainment, car radio power systems, and microcontroller-based vehicle electronics requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for TDA3618JR/N1C,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 (originally Philips Semiconductors) is a global leader in high-reliability automotive ICs, with deep expertise in power management, interface, and safety-critical analog solutions.
The TDA3618JR/N1C,112 belongs to NXP's legacy automotive analog power portfolio, specifically engineered for cost-sensitive, high-transient car radio applications requiring integrated voltage regulation, ignition sensing, and protected switching in a single package.
FAQ
What is the function of the BU pin on the TDA3618JR/N1C,112?
The BU (backup) pin on the TDA3618JR/N1C,112 connects to an external storage capacitor that sustains regulator 2 (REG2) output during battery voltage dropout. When VP falls below 1.9 V, the BU capacitor discharges into REG2 to maintain 5 V for up to several milliseconds - enabling the microcontroller to execute a controlled shutdown sequence. This function is explicitly defined in the Functional Description section of the 2002 Philips datasheet.
Does the TDA3618JR/N1C,112 support load dump protection, and what is its rating?
Yes, the TDA3618JR/N1C,112 supports load dump protection per ISO 7637-2 Pulse 5a requirements: it withstands up to 50 V for ≤50 ms with rise time ≥2.5 ms while maintaining regulator 2 operation. During load dump, REG1 and REG3 shut down, but REG2, RESET, and HOLD remain functional - ensuring microcontroller continuity. This is confirmed in the Quick Reference Data and Limiting Values tables.
How does the HOLD output behave during thermal shutdown?
During thermal shutdown, the HOLD output of the TDA3618JR/N1C,112 is actively pulled LOW, as stated in the Functional Description: "The hold circuit is also controlled by the temperature and load dump protection. Activating the temperature or load dump protection causes a hold (LOW) during the time the protection is activated." This provides immediate system-level warning of thermal fault conditions to the microcontroller.
Can the TDA3618JR/N1C,112 be used without a microcontroller?
Yes, the TDA3618JR/N1C,112 supports microcontroller-less operation. Its regulators can be enabled via fixed bias on EN1/EN3, the power switch controlled directly via ENSW, and ignition buffers used for discrete logic interfacing. The General Description states it is "intended for use in car radios with or without a microcontroller," and the block diagram shows autonomous regulation and protection functions independent of MCU control.
What is the maximum continuous current rating of the power switch in the TDA3618JR/N1C,112?
The power switch in the TDA3618JR/N1C,112 delivers 2.0 A continuous current at VP = 16 V and VSW = 13.5 V, as specified in the Characteristics table (Idc = 1.8 / 2.0 / − A). At VP ≥17 V, clamping limits output to 16 V and current is restricted to 1.8 A maximum. Peak current capability is 3 A, but only for short durations under foldback-delayed short-circuit conditions.
TDA3618JR/N1C,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 17-SIP Formed Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- -
- Current - Supply:
- 310µA
- Voltage - Supply:
- 11V ~ 18V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 17-PDBS
TDA3618JR/N1C,112 FAQ
1.How can I place an order for TDA3618JR/N1C,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA3618JR/N1C,112 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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6.How does Aetrix verify that TDA3618JR/N1C,112 is sourced from the original manufacturer or authorized distributors?
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7.What is the process for return or replacement of TDA3618JR/N1C,112?
All TDA3618JR/N1C,112 units undergo pre-shipment inspection (PSI). If there is an issue with TDA3618JR/N1C,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 TDA3618JR/N1C,112 part is unused and in its original packaging.
Return procedure for TDA3618JR/N1C,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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