Diodes Incorporated ZXMS81045SP-13

Overview

ZXMS81045SP from Diodes Incorporated is a single-channel, high-side power switch in SO-8EP (Type E) package with integrated n-channel vertical MOSFET, temperature/current sensing, charge-pump gate drive, and diagnostic feedback. It operates from 5V–28V supply, delivers 4A nominal load current, features 90mΩ R_DS(ON) at +150°C, and provides proportional current-sense output (K_ILIS = 1200) for automotive-grade 12V grounded loads including incandescent lamps and motors.

For engineers reviewing the ZXMS81045SP datasheet, ZXMS81045SP pinout, ZXMS81045SP application, or ZXMS81045SP equivalent, this device supports high-side switching with real-time fault detection (overload, overtemperature, short-circuit, open-load), logic-level enable (3.3V/5V compatible), and stable undervoltage protection - critical for robust embedded power control in automotive and industrial systems.

Technical Context

The ZXMS81045SP integrates a monolithic vertical power MOSFET with on-die current and temperature sensors, enabling closed-loop diagnostics without external shunts. Its charge-pumped gate driver sustains full conduction down to 5V supply while maintaining <0.5µA standby current in OFF state.

Protection architecture includes dynamic overtemperature cycling (∆T_J(SW) = 40K), absolute thermal shutdown (T_J(SC) = +150°C to +200°C), voltage-dependent current limiting (I_L5(SC) = 25A at V_DS = 5V), and active clamping for load dump (V_S(LD) = 41V) and reverse-battery events (V_DS(REV) = 0.8V).

Key Specifications

Pinout & Package

Package: SO-8EP (Type E) with exposed heatsink pad (EP) connected to VS for enhanced thermal performance (R_θJC = 5.2K/W). Pin 1–8 arranged per top-view layout; EP electrically tied to VS pin (Pin 8).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side power switch applications.

Compared with TPS4H160-Q1 and VNQ7E100AJTR, the ZXMS81045SP offers superior low-current sense accuracy (via V_DS regulation), lowest standby current (0.5µA), and integrated open-load detection - making it optimal for battery-critical automotive lighting and compact industrial modules.

Availability

ZXMS81045SP is available at Aetrix Electronics and suitable for automotive lighting control, engine bay power distribution, industrial motor starter, and smart fuse replacement requiring stable component supply across extended temperature and transient-voltage environments.

Supply support for ZXMS81045SP 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, computing, and consumer markets.

The ZXMS81045SP belongs to Diodes' IntelliFET® family of intelligent high-side switches, designed specifically for replacing electromechanical relays and discrete protection circuits in 12V/24V automotive and harsh-environment industrial systems.

FAQ

What is the maximum load-dump voltage the ZXMS81045SP can withstand?

The ZXMS81045SP supports load-dump protection up to 41V per ISO 7637-2 Pulse 5a, achieved through internal clamping between VS and GND. This requires only a 150Ω resistor (RGND) between GND and system ground to limit clamp current and protect the pin. No external TVS diode is needed for standard automotive load-dump compliance.

How does open-load detection work in both ON and OFF states?

Open-load detection uses dual methods: in the ON state, it monitors load current via the IS pin - if I_L falls below 5mA while IN is high, an open circuit is flagged. In the OFF state, it measures V_DS; if voltage exceeds 3.5V (indicating no current path to ground), the condition is reported. Both modes operate independently and feed the same I_IS(FAULT) output signal.

Can the ZXMS81045SP drive inductive loads without external flyback components?

Yes - the device includes an active output clamp that limits V_DS to 47V (typical) during inductive turn-off, safely dissipating ring-back energy in the MOSFET channel. This eliminates the need for external freewheeling diodes or Zener clamps in most 12V applications, provided layout minimizes parasitic inductance and thermal design meets R_θJA ≤ 42K/W.

What is the minimum supply voltage required for reliable undervoltage protection?

The ZXMS81045SP guarantees undervoltage protection functionality down to 3.3V (V_S(UV) typ.), with 0.85V hysteresis ensuring stable restart at 4.2V (V_{S(OP_MIN)} typ.). Below 3V, all protections are disabled and the device enters undefined behavior - thus 3.3V serves as the hard lower bound for safe operation with full diagnostic coverage.