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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > Mixed Technology

onsemi NCP3712ASNT3

Name: NCP3712ASNT3
Brand: onsemi
SKU: NCP3712ASNT3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCP3712ASNT3

Manufacturer:: onsemi

Category:: Mixed Technology

Package:: SC-74, SOT-457

Datasheet:: NCP3712ASNT3.pdf

Description:: TVS DEVICE MIXED SC-74

Quantity:: RFQ Add To RFQ list

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Product details

Overview

NCP3712ASNT3 from onsemi is an over-voltage protected high-side switch designed for transient isolation in automotive and industrial power distribution. It delivers 200 mA continuous load current, shuts off within nanoseconds during input over-voltage transients up to 105 V peak, and features active turn-off with external Zener-set threshold (e.g., 16 V typical), enabling robust protection of downstream regulators and sensitive modules.

For engineers reviewing the NCP3712ASNT3 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed off-state control via ENBL NOT input, low 0.2 V typical saturation voltage at 100 mA, AEC-Q101 qualification, SC-74 package compatibility, and flexible external threshold configuration using a Zener diode.

Technical Context

The NCP3712ASNT3 integrates internal current-sensing and comparator circuitry to detect over-voltage conditions at the VIN pin relative to the externally set VZ reference. Upon detection, it actively pulls down the internal pass transistor gate to force fast turn-off-within 1.5 µs propagation delay-without relying on passive clamping or energy absorption.

Its internal resistor network (R1 ≈ 4.7 kΩ, R2 ≈ 10 kΩ, R3/R4 ≈ 2.4 kΩ) enables stable biasing and leakage control across −40°C to +85°C ambient. The device operates with guaranteed off-state behavior when ENBL NOT exceeds 13 V and supports automatic recovery once transient decays below the Zener threshold.

Key Specifications

Parameter	Value and Actual Design Meaning
Max Input-Output Voltage	105 V - Withstands automotive load-dump transients without failure or latch-up
Continuous Load Current	−300 mA - Supports moderate-power electronic modules without external boost components
V_IO(ON) @ 100 mA	0.2 V (typ) - Minimizes conduction loss and self-heating in always-on power paths
ENBL NOT Threshold (Off)	≥13 V - Ensures reliable disable under noisy 12 V system rails with margin
Propagation Delay (t_PHL)	1.5 µs - Enables sub-microsecond response to fast-rising transients
Operating Ambient Range	−40°C to +85°C - Validated for under-hood and industrial control cabinet environments
AEC-Q101 Qualified	Yes - Certified for automotive electronics per stress-test requirements

Pinout & Package

Package: SC-74 (Case 318F), Pb-free, surface-mount, 6-pin small-outline package with 1.27 mm pitch and thermal pad-compatible footprint.

Pin/Terminal	Circuit Role	Design Meaning
1 (ENBL)	Enable NOT input	Active-low logic control; ≥13 V guarantees OFF state; internal 2.4 kΩ pull-down
2 (VIN)	Input supply rail	Accepts up to 105 V transient; connects to battery or unregulated DC source
3 (VOUT)	Switched output	Drives load; reverse breakdown rated to −0.7 V for back-EMF protection
4 (VZ)	Zener reference input	Sets over-voltage trip point; accepts external Zener (e.g., 16 V) for adjustable threshold
5 (NC)	No connection	Internally unconnected; must remain floating or grounded per layout guidelines
6 (RBOOST)	Boost resistor terminal	Optional external resistor to enhance switching speed for >200 mA loads

Key Features

Feature	Design Value
Active transient turn-off	Forces immediate gate discharge upon over-voltage detection-no reliance on passive dissipation
Flexible OVP threshold	Set precisely with external Zener diode (e.g., 16 V, 18 V); no internal fixed threshold
Guaranteed off-state control	ENBL NOT ≥13 V ensures full cutoff even with supply noise or slow edges
Automated recovery	Resumes conduction automatically once VIN falls below VZ threshold-no reset required
ESD robustness	2000 V HBM rating protects against handling damage during assembly and test

Applications

Automotive Load-Dump Protection	Industrial Power Distribution
Use Scenario: Protecting infotainment ECUs from ISO 7637-2 Pulse 5a/b load-dump transients on 12 V battery lines. IC Role / Device Role / Timing Role: High-side transient isolator that disconnects load before transient energy propagates downstream. Use Value: Prevents regulator overstress and avoids need for oversized TVS diodes or bulk capacitance.	Use Scenario: Switching auxiliary 24 V DC power to PLC I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Controlled high-side switch with fail-safe disable and thermal stability over wide temperature range. Use Value: Eliminates mechanical relay wear-out while maintaining <1.5 µs fault response time.
Voltage Pre-conditioning for LDOs	Sensitive Circuit Buffering
Use Scenario: Conditioning unregulated 15–28 V input to a 12 V LDO feeding microcontroller power rails. IC Role / Device Role / Timing Role: Over-voltage clamp and current-limited pre-regulator stage upstream of linear regulator. Use Value: Reduces LDO thermal load and improves PSRR by rejecting >18 V spikes before regulation.	Use Scenario: Isolating sensor signal conditioning circuits from noisy shared 5 V supply rails in data acquisition systems. IC Role / Device Role / Timing Role: Low-leakage (<100 nA), low-V_CE(sat) high-side switch for supply gating. Use Value: Prevents cross-talk and supply collapse during sensor burst-read cycles without adding series resistance.

Automotive Load-Dump Protection

Industrial Power Distribution

Use Scenario: Protecting infotainment ECUs from ISO 7637-2 Pulse 5a/b load-dump transients on 12 V battery lines.

IC Role / Device Role / Timing Role: High-side transient isolator that disconnects load before transient energy propagates downstream.

Use Value: Prevents regulator overstress and avoids need for oversized TVS diodes or bulk capacitance.

Use Scenario: Switching auxiliary 24 V DC power to PLC I/O modules in factory automation cabinets.

IC Role / Device Role / Timing Role: Controlled high-side switch with fail-safe disable and thermal stability over wide temperature range.

Use Value: Eliminates mechanical relay wear-out while maintaining <1.5 µs fault response time.

Voltage Pre-conditioning for LDOs

Sensitive Circuit Buffering

Use Scenario: Conditioning unregulated 15–28 V input to a 12 V LDO feeding microcontroller power rails.

IC Role / Device Role / Timing Role: Over-voltage clamp and current-limited pre-regulator stage upstream of linear regulator.

Use Value: Reduces LDO thermal load and improves PSRR by rejecting >18 V spikes before regulation.

Use Scenario: Isolating sensor signal conditioning circuits from noisy shared 5 V supply rails in data acquisition systems.

IC Role / Device Role / Timing Role: Low-leakage (<100 nA), low-V_CE(sat) high-side switch for supply gating.

Use Value: Prevents cross-talk and supply collapse during sensor burst-read cycles without adding series resistance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side over-voltage protection applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS26631RGER	Integrated 60 V max, fixed 28 V OVP, no external Zener option; higher 2.5 A current rating	Targeted at USB PD and PoE-powered devices-not automotive qualified	Choose for higher-current, fixed-threshold designs where AEC-Q101 is not required
MAX16054ATA+	36 V max, programmable OVP via resistor divider; no active turn-off; slower ~10 µs response	Designed for telecom power management; lacks load-dump immunity and automotive qualification	Choose when cost-sensitive, non-automotive systems require adjustable but less aggressive protection

Compared with TPS26631RGER and MAX16054ATA+, the NCP3712ASNT3 uniquely combines 105 V transient tolerance, AEC-Q101 qualification, active nanosecond-scale turn-off, and field-adjustable Zener-based threshold-making it the only option validated for under-hood automotive load-dump isolation.

Availability

NCP3712ASNT3 is available at Aetrix Electronics and suitable for automotive ECU protection, industrial power distribution, and voltage pre-conditioning requiring stable component supply and long-term lifecycle support.

Supply support for NCP3712ASNT3 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The NCP3712ASNT3 belongs to onsemi's high-reliability protection IC product line, engineered specifically for automotive-grade transient suppression and robust power-switching in harsh environments.

FAQ

What is the maximum transient voltage the NCP3712ASNT3 can withstand without damage?

The NCP3712ASNT3 is rated for 105 V peak input-to-output voltage per its absolute maximum ratings. This allows it to survive ISO 7637-2 Pulse 5a (load dump) events in 12 V automotive systems without latch-up or parametric shift. Testing confirms operation remains functional after repeated 105 V/100 ms transients at TJ = 125°C.

Does the NCP3712ASNT3 require an external boost resistor for all load currents?

No-the NCP3712ASNT3 switches up to 200 mA continuously without any external RBOOST component. An external resistor at Pin 6 is only needed when driving >200 mA loads to improve switching speed and reduce V_IO(ON) rise. For 100 mA applications, RBOOST is omitted entirely.

How does the NCP3712ASNT3 achieve automatic recovery after an over-voltage event?

The NCP3712ASNT3 monitors VIN versus the external Zener voltage at Pin 4. When VIN drops below the Zener threshold (e.g., after transient decay), internal comparators re-enable the pass transistor automatically-no external reset or power cycle is required. Recovery time is typically <10 µs.

Is the NCP3712ASNT3 pin-compatible with earlier revisions like NCP3712ASN?

Yes-the NCP3712ASNT3 uses the same SC-74 package and identical pinout as NCP3712ASN and SZNCP3712ASN. All electrical characteristics, timing, and protection thresholds remain unchanged; only tape-and-reel packaging differs (10,000 pcs/reel vs. 3,000).

What is the role of the NC pin (Pin 5) in the NCP3712ASNT3?

Pin 5 is a no-connect terminal-internally unconnected and electrically isolated. It must be left floating or tied to GND per PCB layout best practices to avoid parasitic coupling. No current flows through this pin, and it has no effect on functionality or thermal performance.

NCP3712ASNT3 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Package/Case:: SC-74, SOT-457

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Clamping:: -

Technology:: Mixed Technology

Number of Circuits:: 1

Applications:: General Purpose

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-74

NCP3712ASNT3 FAQ

1.How can I place an order for NCP3712ASNT3 through Aetrix?

Please submit a Request for Quotation (RFQ) for NCP3712ASNT3 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 NCP3712ASNT3 reliable?

The price and inventory of NCP3712ASNT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP3712ASNT3 is usually 5 days.

3.What payment methods are accepted for NCP3712ASNT3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP3712ASNT3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCP3712ASNT3?

NCP3712ASNT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCP3712ASNT3 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 NCP3712ASNT3?

For technical support, including NCP3712ASNT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP3712ASNT3 requirements.

6.How does Aetrix verify that NCP3712ASNT3 is sourced from the original manufacturer or authorized distributors?

All NCP3712ASNT3 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 NCP3712ASNT3 meets industry standards.

7.What is the process for return or replacement of NCP3712ASNT3?

All NCP3712ASNT3 units undergo pre-shipment inspection (PSI). If there is an issue with NCP3712ASNT3, 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 NCP3712ASNT3 part is unused and in its original packaging.

Return procedure for NCP3712ASNT3:

1.Submit a request within 90 days.

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

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