onsemi NCP3712ASNT1G

Overview

NCP3712ASNT1G from onsemi is an over-voltage protected high-side switch designed to isolate sensitive loads from input transients up to 105 V peak, featuring active turn-off response, flexible external Zener-set OV threshold, and guaranteed off-state control via ENBL input. It delivers ≤0.5 V saturation voltage at 100 mA, supports continuous 300 mA load current, and operates across −40°C to +85°C ambient.

For engineers reviewing the NCP3712ASNT1G datasheet, pinout, applications, or equivalent options, key selection criteria include transient withstand capability (105 V), active OV shutdown timing (tPHL ≤ 1.5 µs), low R_DS(on)-equivalent conduction loss, and automotive-grade AEC−Q101 qualification for harsh-environment power distribution.

Technical Context

The NCP3712ASNT1G integrates a high-voltage lateral DMOS pass element with internal sensing and protection circuitry. Its active turn-off mechanism triggers within 1.5 µs of over-voltage detection, using externally adjustable Zener-based threshold and internal R1/R2 resistor network (4.7 kΩ typ) for precise trip point setting.

It operates as a controlled high-side switch with ENBL NOT logic: low-true enable input ensures guaranteed off-state at ≥13 V, while internal R3 (2.4 kΩ typ) and R4 (2.4 kΩ typ) define leakage paths and bias conditions. The device sustains reverse input-to-VZ stress up to −9.0 V and features ESD robustness per 2000 V HBM.

Key Specifications

Pinout & Package

Package: SC−74 (Case 318F), 6-pin surface-mount, Pb-free, footprint-optimized for space-constrained power rails.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS26631RGER and MAX16054ATA+, the NCP3712ASNT1G uniquely combines 105 V transient tolerance, field-adjustable OV threshold, AEC−Q101 qualification, and 300 mA drive - making it the only option qualified for automotive load-dump protection with programmable trip points.

Availability

NCP3712ASNT1G is available at Aetrix Electronics and suitable for automotive ECU protection, industrial DC power distribution, and precision power pre-conditioning requiring stable component supply, long-term lifecycle support, and AEC−Q101-compliant sourcing.

Supply support for NCP3712ASNT1G 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 management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The NCP3712ASNT1G belongs to onsemi's high-reliability power switch family, engineered specifically for transient-hardened power gating in automotive and industrial environments where load-dump immunity and guaranteed off-state integrity are mandatory.

FAQ

What is the maximum transient voltage the NCP3712ASNT1G can withstand without damage?

The NCP3712ASNT1G is rated for 105 V peak input-to-output voltage per absolute maximum ratings. This allows it to survive automotive load-dump events defined in ISO 7637-2 without latch-up or breakdown. The device achieves this through internal lateral DMOS structure and optimized junction design - confirmed in onsemi's AEC−Q101 stress testing. Operation beyond 105 V risks permanent damage.

Does the NCP3712ASNT1G require an external Zener diode to function?

Yes - the NCP3712ASNT1G requires an external Zener diode connected to Pin 4 (VZ) to set its over-voltage trip threshold. The internal resistor network (R1/R2) forms a voltage divider with the Zener to determine activation point; common values include 13.5 V, 16 V, or 24 V Zeners. Without this Zener, the device cannot detect or respond to over-voltage conditions.

How does the ENBL input behave, and what voltage level disables the NCP3712ASNT1G?

The ENBL input is active-low (NOT logic). The NCP3712ASNT1G is guaranteed off when ENBL voltage is ≥13 V, per electrical characteristics table. At voltages ≤13 V, the device enables and follows normal switching behavior. This high-threshold disable feature ensures fail-safe operation during supply brown-outs or controller faults.

Can the NCP3712ASNT1G drive a 300 mA load continuously, and what thermal considerations apply?

Yes - the NCP3712ASNT1G supports −300 mA continuous output current per maximum ratings. At 100 mA, V_IO(ON) is typically 0.2 V, yielding ~20 mW conduction loss. With 300 mA and worst-case 0.5 V drop, power dissipation reaches 150 mW. In SC−74 package, this requires ≤2.4 mW/°C derating above 25°C - limiting ambient to ~85°C with minimal copper pour.

Is the NCP3712ASNT1G pin-compatible with other devices in the NCP37xx family?

No - the NCP3712ASNT1G uses a unique 6-pin SC−74 pinout (ENBL/VIN/VOUT/VZ/NC/RBOOST) not shared with NCP3711 or NCP3713. Pin 5 is NC here but functional in other variants; RBOOST (Pin 6) is absent in earlier versions. Substituting requires PCB layout revision - always verify pin mapping against the specific variant's datasheet.