Diodes Incorporated NIS5132MN2-FN-7

Overview

NIS5132MN2-FN-7 from Diodes Incorporated is a self-protected, resettable electronic fuse with auto-retry thermal shutdown, designed for 12V industrial and storage power rails. It integrates a 30mΩ typical R_DS(ON) NMOS power device, 9–18V input range, 3.6A continuous current rating at +25°C, overvoltage clamp at 15V, and Kelvin current sensing via ILIMIT pin - deployed in hard disk drive power management and motherboard load protection.

For engineers reviewing the NIS5132MN2-FN-7 datasheet, NIS5132MN2-FN-7 pinout, NIS5132MN2-FN-7 application, or NIS5132MN2-FN-7 equivalent, key selection criteria include thermal shutdown behavior (auto-retry vs. latching), dv/dt ramp control via external capacitor, programmable current limit using resistor on ILIMIT pin, and integrated overvoltage clamping without output shutdown.

Technical Context

The NIS5132MN2-FN-7 implements a fully integrated electronic fuse architecture with internal NMOS power switch, charge-pump gate driver, and five protection circuits: undervoltage lockout (UVLO) at 8.5V typ, overvoltage clamp at 15V typ, dv/dt-controlled soft-start, current limiting via external R_LIMIT, and thermal shutdown at +175°C with +45°C hysteresis.

Its tri-state Enable/Fault pin supports system-level coordination: logic-high enables conduction, logic-low disables output, and mid-voltage (~1.4V) indicates active thermal fault - enabling up to three devices to be daisy-chained for synchronized shutdown during thermal events.

Key Specifications

Pinout & Package

Package: U-DFN3030-10 (3.0mm × 3.0mm × 0.6mm), thermally enhanced exposed pad, RoHS-compliant lead-free finish.

Key Features

Applications

Availability

NIS5132MN2-FN-7 is available at Aetrix Electronics and suitable for hard disk drive power management, motherboard load protection, industrial PLC I/O modules, and NAS backplane applications requiring stable component supply and long-term lifecycle support.

Supply support for NIS5132MN2-FN-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The NIS5132 series belongs to Diodes' electronic fuse product line, engineered specifically for robust, self-protected 9–18V power rail protection in space-constrained applications where thermal resilience and programmable current limiting are critical.

FAQ

What is the thermal shutdown behavior difference between NIS5132MN2-FN-7 and NIS5132MN1-FN-7?

The NIS5132MN2-FN-7 features auto-retry thermal shutdown: it automatically resumes conduction once the junction temperature falls by ≥45°C after a thermal event. In contrast, the MN1 variant latches off permanently until the Enable/Fault pin is actively pulled low and then released, or until input power is cycled - making MN2 ideal for unattended or sealed systems requiring autonomous recovery.

How is current limit set, and what is the impact of using Kelvin vs. direct sensing?

Current limit is set by a resistor between Source pins and ILIMIT (Pin 4). Direct sensing places the resistor in the main load path, including bond-wire resistance (±15% error); Kelvin sensing uses one Source pin as dedicated sense return, eliminating bond-wire contribution and improving accuracy to ±5% - essential for tight-tolerance overload protection.

Can the dv/dt pin be left unconnected, and what happens if it is?

Yes, Pin 2 (dv/dt) may be left unconnected: an internal capacitor ensures a typical 1.8ms output voltage ramp time, preventing inrush current into capacitive loads. Adding an external ceramic capacitor linearly extends ramp time (t_ramp ≈ C_ext × 90µA), allowing precise control of startup slew rate for sensitive downstream circuitry.

Does the overvoltage clamp function require external components, and what is its failure mode?

No external components are needed: the 15V overvoltage clamp is fully internal and activates when V_DD exceeds the threshold. During clamping, the device remains operational - it does not shut down - but sustained overvoltage causes increased power dissipation in the NMOS FET; if die temperature reaches +175°C, thermal shutdown engages as a secondary safety layer.