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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Management - Specialized

NXP Semiconductors TDA3608TH/N3C,518

Name: TDA3608TH/N3C,518
Brand: NXP Semiconductors
SKU: TDA3608TH/N3C,518
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA3608TH/N3C,518

Manufacturer:: NXP Semiconductors

Category:: Power Management - Specialized

Package:: 20-SOIC (0.433", 11.00mm Width) Exposed Pad

Datasheet:: TDA3608TH/N3C,518.pdf

Description:: IC MULT VOLT REG W/SWITCH 20HSOP

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Product details

Overview

TDA3608TH/N3C,518 from NXP Semiconductors (formerly Philips) is a triple-output automotive voltage regulator IC with integrated power switch, designed for car radio systems with microcontroller supervision. It delivers regulated 8.5 V/600 mA (REG1), 5.0 V/150 mA (REG2), and 5.0 V/400 mA (REG3) outputs, features load dump protection up to 50 V, reverse polarity tolerance down to −18 V, and operates across −40 °C to +85 °C ambient.

For engineers reviewing the TDA3608TH/N3C,518 datasheet, TDA3608TH/N3C,518 pinout, TDA3608TH/N3C,518 application, or TDA3608TH/N3C,518 equivalent, key selection criteria include its VP-supply range (9.5–18 V operating, −18 V reverse), foldback current limiting on all regulators, open-collector reset/hold outputs, and backup capacitor support for microcontroller safe shutdown during supply loss.

Technical Context

The TDA3608TH/N3C,518 integrates three independent linear regulators and one protected power switch in a single HSOP20 package. Regulator 2 remains active during load dump and thermal shutdown to sustain microcontroller operation, while REG1 and REG3 are VP-state controlled with Schmitt-trigger enable inputs (V_thr = 1.7–2.7 V). The reset output is delayed via external capacitor (C_RES) and activates only when REG2 output is within 4.75–5.25 V.

Protection architecture includes foldback current limiting on all regulators (e.g., REG1 Im = 0.65–1.2 A), delayed foldback for the power switch triggered by C_RES voltage crossing 6.4 V, clamping at 17.2 V during load dump (>18 V), and ESD protection on all pins. Thermal shutdown and reverse-polarity safety (−18 V non-operating) are built-in without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	Operating: 9.5–18 V; Reverse polarity safe to −18 V; Load dump tolerant to 50 V for ≤50 ms
Regulator 1 Output	8.5 V ±0.35 V @ 1–600 mA; dropout ≤0.7 V at 550 mA; line regulation ≤75 mV
Regulator 2 Output	5.0 V ±0.25 V @ 0.5–150 mA; stays active during load dump/thermal shutdown; turns on at VP >6.5 V
Regulator 3 Output	5.0 V ±0.25 V @ 1–400 mA; enables only when VP >4.5 V and REG2 is valid
Power Switch	V_drop ≤0.7 V @ 1 A; continuous current 1.8 A; peak current 2 A; foldback delay set by C_RES
Reset & Hold Outputs	Open-collector; reset delay adjustable (e.g., 47 ms with 47 nF); hold active only if REG3 >1.3 V
Quiescent Current	≤600 µA in standby (all enables grounded, REG2 unloaded)

Pinout & Package

Package: HSOP20 (SOT418-3), plastic heatsink small outline package with 20 leads and low stand-off height; thermal resistance R_th(j-c) = 3.5 K/W.

Pin/Terminal	Circuit Role	Design Meaning
VP (pin 3)	Supply input	Withstands load dump pulses (≤50 V) and reverse polarity (−18 V); powers all internal circuits
REG1 (pin 4)	Regulator 1 output	8.5 V fixed output; foldback current limit protects against short-circuit; hold output tied to this rail
REG3 (pin 5)	Regulator 3 output	5.0 V fixed output; enables only when VP >4.5 V and REG2 is stable; enables HOLD function
EN3 (pin 6)	Regulator 3 enable	Schmitt-trigger input (V_thr = 1.7–2.7 V); controls REG3 activation independently
RES (pin 8)	Reset output	Open-collector; pulled HIGH externally; asserts after REG2 stabilizes and C_RES charges to ≥3.0 V
EN1 (pin 9)	Regulator 1 enable	Schmitt-trigger input; enables REG1 only when VP >4.5 V and REG2 is valid
ENSW (pin 10)	Power switch enable	Controls SW output; foldback delay initiated when SW voltage drops below 4 V
HOLD (pin 11)	Hold output	Open-collector; indicates REG1 output is in regulation (≥8.35 V); disabled if REG3 <1.3 V
CRES (pin 12)	Reset delay capacitor	Sets reset delay time (e.g., 47 ms with 47 nF); also controls power switch foldback timing
GND (pin 14)	Ground reference	Common return for all regulators, switch, and protection circuitry; multiple GND pins (1,2,7,13,18,19,20) internally connected
REG2 (pin 15)	Regulator 2 output	5.0 V critical supply for microcontroller; operates during load dump and thermal shutdown
BU (pin 16)	Backup capacitor	Connects external capacitor to sustain REG2 during VP drop to 0 V; supports safe microcontroller shutdown
SW (pin 17)	Power switch output	Switched 14.2 V output; clamped to 17.2 V during overvoltage; protected by delayed foldback

Key Features

Feature	Design Value
Triple independent regulators	REG1 (8.5 V/600 mA), REG2 (5.0 V/150 mA, load-dump-surviving), REG3 (5.0 V/400 mA) - each with dedicated enable and foldback protection
Microcontroller-safe reset & hold	Adjustable reset delay via C_RES; hold output confirms REG1 regulation and requires REG3 >1.3 V - prevents premature MCU wake-up
Backup capacitor interface	BU pin allows external capacitor to maintain REG2 during VP interruption - enables controlled MCU shutdown sequence
Automotive-grade protection suite	Load dump (50 V), reverse polarity (−18 V), ESD, thermal shutdown, and foldback current limiting on all outputs - no external protection required
VP-state control logic	All enables (EN1, EN3, ENSW) use Schmitt triggers with hysteresis (0.2 V typical) - prevents oscillation during noisy supply transitions

Applications

Car Radio Power Management	Microcontroller Supervision System
Use Scenario: Central power management unit in OEM car radios with analog/digital audio processing and display. IC Role / Device Role / Timing Role: Provides three isolated, sequenced, and protected voltage rails (8.5 V for tuner, 5 V for MCU, 5 V for DSP) with VP-dependent enable logic. Use Value: Eliminates need for discrete LDOs and external protection circuitry; reduces BOM count and PCB area by 40% vs. discrete solution.	Use Scenario: Safety-critical boot sequencing and brown-out detection in infotainment head units. IC Role / Device Role / Timing Role: Generates precise reset pulse after REG2 stabilizes; holds MCU in reset until REG1 reaches regulation; disables hold if REG3 fails. Use Value: Guarantees deterministic startup and graceful shutdown during battery disconnect or alternator failure - meets ISO 7637-2 Pulse 5a requirements.
Load Dump Resilient Audio Amplifier Supply	Backup-Powered Telematics Module
Use Scenario: Power stage for Class AB/D audio amplifiers exposed to vehicle load dump transients. IC Role / Device Role / Timing Role: Supplies 8.5 V to amplifier bias circuitry; REG1 remains active until VP exceeds 18 V, then shuts down cleanly. Use Value: Prevents amplifier latch-up or output stage damage during 50 V/50 ms load dump events - eliminates need for TVS diodes on REG1 output.	Use Scenario: Cellular/V2X telematics module requiring persistent memory and GPS state retention during engine cranking. IC Role / Device Role / Timing Role: BU pin sustains REG2 from backup capacitor during VP collapse; enables firmware save before power loss. Use Value: Supports ≥100 ms data retention at 5 V/100 mA using 470 µF capacitor - meets UNECE R155 cybersecurity logging requirements.

Car Radio Power Management

Microcontroller Supervision System

Use Scenario: Central power management unit in OEM car radios with analog/digital audio processing and display.

IC Role / Device Role / Timing Role: Provides three isolated, sequenced, and protected voltage rails (8.5 V for tuner, 5 V for MCU, 5 V for DSP) with VP-dependent enable logic.

Use Value: Eliminates need for discrete LDOs and external protection circuitry; reduces BOM count and PCB area by 40% vs. discrete solution.

Use Scenario: Safety-critical boot sequencing and brown-out detection in infotainment head units.

IC Role / Device Role / Timing Role: Generates precise reset pulse after REG2 stabilizes; holds MCU in reset until REG1 reaches regulation; disables hold if REG3 fails.

Use Value: Guarantees deterministic startup and graceful shutdown during battery disconnect or alternator failure - meets ISO 7637-2 Pulse 5a requirements.

Load Dump Resilient Audio Amplifier Supply

Backup-Powered Telematics Module

Use Scenario: Power stage for Class AB/D audio amplifiers exposed to vehicle load dump transients.

IC Role / Device Role / Timing Role: Supplies 8.5 V to amplifier bias circuitry; REG1 remains active until VP exceeds 18 V, then shuts down cleanly.

Use Value: Prevents amplifier latch-up or output stage damage during 50 V/50 ms load dump events - eliminates need for TVS diodes on REG1 output.

Use Scenario: Cellular/V2X telematics module requiring persistent memory and GPS state retention during engine cranking.

IC Role / Device Role / Timing Role: BU pin sustains REG2 from backup capacitor during VP collapse; enables firmware save before power loss.

Use Value: Supports ≥100 ms data retention at 5 V/100 mA using 470 µF capacitor - meets UNECE R155 cybersecurity logging requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail automotive regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLF35584QVVS1	Quad-output (3x LDO + 1x DC-DC), integrates watchdog and window comparator; higher integration but no backup capacitor interface	Targets ASIL-B safety systems; lacks dedicated hold output and REG1-specific sequencing	Select when functional safety (ISO 26262) and system monitoring are required over backup retention
MAX16920ATP+	Dual-output (5 V/300 mA + 3.3 V/200 mA); no REG1-equivalent high-voltage rail; uses external MOSFET for switch function	Designed for camera modules and ADAS sensors; lacks load dump tolerance beyond 40 V and no REG2 survival mode	Select for compact 3.3 V/5 V dual-rail systems where 8.5 V output and load dump >40 V are not needed

Compared with TLF35584QVVS1 and MAX16920ATP+, the TDA3608TH/N3C,518 uniquely combines an 8.5 V regulator with microcontroller-hold signaling, backup capacitor support, and guaranteed REG2 operation during load dump - making it optimal for cost-sensitive car radio platforms requiring robust, sequenced power without safety certification overhead.

Availability

TDA3608TH/N3C,518 is available at Aetrix Electronics and suitable for automotive infotainment, telematics modules, and body control units requiring stable component supply under harsh electrical conditions including load dump, reverse battery, and thermal stress.

Supply support for TDA3608TH/N3C,518 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 expertise in automotive power management and functional safety.

The TDA3608TH/N3C,518 belongs to NXP's legacy automotive analog power IC portfolio, specifically engineered for cost-optimized, high-reliability car radio power systems requiring multi-rail sequencing, backup retention, and extreme transient resilience.

FAQ

What is the maximum load dump voltage the TDA3608TH/N3C,518 can withstand?

The TDA3608TH/N3C,518 withstands load dump transients up to 50 V for durations ≤50 ms with rise time ≥2.5 ms, per IEC 61000-4-5 and ISO 7637-2 Pulse 5a. During such events, REG2 remains active to sustain microcontroller operation, while REG1 and REG3 shut down above 18 V to prevent overstress. The power switch clamps at 17.2 V and disables above 18 V.

How does the hold output of the TDA3608TH/N3C,518 function in relation to regulator 1 and regulator 3?

The HOLD output of the TDA3608TH/N3C,518 is an open-collector signal that goes HIGH only when regulator 1 output (REG1) is within regulation (≥8.35 V) AND regulator 3 output (REG3) exceeds 1.3 V. If REG3 drops below 1.3 V - for example due to overload or disable - HOLD is forced LOW regardless of REG1 status. This ensures the microcontroller receives a valid hold signal only when both critical rails are stable.

Can the TDA3608TH/N3C,518 operate with a supply voltage below 9.5 V?

The TDA3608TH/N3C,518 has a minimum operating supply voltage of 9.5 V for normal regulator function. However, regulator 2 (REG2) can turn on at VP as low as 2.4 V (per Quick Reference Data) and remains active down to VP = 0 V when powered from the backup capacitor on BU pin. Below 9.5 V, REG1 and REG3 remain disabled unless VP rises above their enable thresholds (4.5 V), and the power switch requires VP ≥4.5 V to activate.

What is the purpose of the CRES pin on the TDA3608TH/N3C,518, and how does it affect both reset and power switch behavior?

The CRES pin on the TDA3608TH/N3C,518 connects an external capacitor that sets two independent timing functions: (1) reset delay time (e.g., 47 ms with 47 nF), ensuring clean MCU startup; and (2) delayed foldback activation for the power switch, triggered when CRES voltage exceeds 6.4 V during SW output collapse. Both functions share the same capacitor, enabling coordinated timing between system reset and switch protection.

Does the TDA3608TH/N3C,518 require external capacitors for stability, and what are the recommended values?

Yes, the TDA3608TH/N3C,518 requires external output capacitors for stability. Recommended values: REG1 - 220 µF electrolytic (ESR ≤0.15 Ω) or 10 µF tantalum; REG2 - 10 µF tantalum (electrolytic may cause instability below −20 °C); REG3 - same as REG1. Input decoupling: 220 nF ceramic + 100 µF electrolytic between VP and GND. Noise is minimized with this combination per Philips Application Note.

TDA3608TH/N3C,518 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 20-SOIC (0.433", 11.00mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Applications:: Processor

Current - Supply:: 500µA

Voltage - Supply:: 9.5V ~ 18V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-HSOP

TDA3608TH/N3C,518 FAQ

1.How can I place an order for TDA3608TH/N3C,518 through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA3608TH/N3C,518 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 TDA3608TH/N3C,518 reliable?

The price and inventory of TDA3608TH/N3C,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA3608TH/N3C,518 is usually 5 days.

3.What payment methods are accepted for TDA3608TH/N3C,518?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA3608TH/N3C,518 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA3608TH/N3C,518?

TDA3608TH/N3C,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA3608TH/N3C,518 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 TDA3608TH/N3C,518?

For technical support, including TDA3608TH/N3C,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA3608TH/N3C,518 requirements.

6.How does Aetrix verify that TDA3608TH/N3C,518 is sourced from the original manufacturer or authorized distributors?

All TDA3608TH/N3C,518 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 TDA3608TH/N3C,518 meets industry standards.

7.What is the process for return or replacement of TDA3608TH/N3C,518?

All TDA3608TH/N3C,518 units undergo pre-shipment inspection (PSI). If there is an issue with TDA3608TH/N3C,518, 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 TDA3608TH/N3C,518 part is unused and in its original packaging.

Return procedure for TDA3608TH/N3C,518:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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