Diodes Incorporated ZXMS81090SPQ-13

Overview

ZXMS81090SPQ from Diodes Incorporated is a single-channel automotive-grade high-side power switch in SO-8EP (Type E) package, integrating n-channel vertical MOSFET, charge-pumped gate drive, temperature/current sensing, and diagnostic feedback. It operates from 5V–28V supply, delivers 3A nominal load current with 200mΩ R_DS(ON) at +150°C, and provides proportional analog current-sense output (K_ILIS = 1480) for real-time load monitoring in 12V grounded-load systems.

For engineers reviewing the ZXMS81090SPQ datasheet, ZXMS81090SPQ pinout, ZXMS81090SPQ application, or ZXMS81090SPQ equivalent, this device supports AEC-Q100-compliant automotive designs requiring precise overcurrent/overtemperature fault detection, open-load diagnostics, and robust load-dump (41V) and reverse-battery protection - critical for lamp, motor, and LED control modules.

Technical Context

The ZXMS81090SPQ implements a monolithic high-side switch architecture with integrated charge pump enabling 3.3V/5V logic-compatible IN and DEN inputs. Its output stage uses voltage-dependent current limiting and dynamic thermal cycling (∆T_J(SW) = 80K) to sustain overload conditions without latch-up.

Diagnostic functionality centers on the IS pin: it outputs linear sense current (I_IS = I_L/K_ILIS) during normal operation, switches to defined fault current (I_IS(FAULT)) during overload, overtemperature, short-circuit, or open-load (OFF-state), and enters high-impedance when DEN is low - enabling multi-device current-sense bus sharing.

Key Specifications

Pinout & Package

Package: SO-8EP (Type E), 5.0mm × 6.0mm × 1.75mm body with exposed thermal pad (EP) connected to VS internally. Pin 1 marked by notch; top-view orientation per datasheet Figure 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTS50085-1TAD and VNQ7E100AJTR, the ZXMS81090SPQ uniquely combines 1480-ratio analog current sensing, voltage-dependent current limiting, and OFF-state open-load detection in a single SO-8EP package - reducing BOM count and diagnostic design complexity for AEC-Q100-compliant 12V systems.

Availability

ZXMS81090SPQ is available at Aetrix Electronics and suitable for automotive lighting control, engine bay actuator drive, body control module outputs, and commercial vehicle LED signage requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for ZXMS81090SPQ 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 ICs, specializing in high-reliability power management, signal integrity, and protection solutions for automotive, industrial, and consumer markets.

The ZXMS81090SPQ belongs to Diodes' IntelliFET® high-side switch family, engineered specifically for AEC-Q100-compliant automotive power distribution with integrated diagnostics, eliminating discrete protection and sensing components in body electronics and lighting modules.

FAQ

What is the purpose of the DEN pin on the ZXMS81090SPQ?

The DEN (Diagnostic Enable) pin controls the output state of the IS pin. When DEN is high, the IS pin delivers either proportional load current sense (I_L/1480) or a defined fault current (I_IS(FAULT)). When DEN is low, the IS pin enters high-impedance mode, allowing multiple ZXMS81090SPQ devices to share a common diagnostic bus without signal contention or external multiplexing.

How does the ZXMS81090SPQ handle inductive load turn-off?

The device integrates an active output clamp that limits V_DS to 47V typical during inductive ring-off, preventing MOSFET avalanche. During turn-off, the OUT pin is allowed to swing negative relative to GND, and the internal clamp dissipates stored energy safely. No external flyback diode is required, and the clamp operates without external components across the full 5–28V supply range.

Can the ZXMS81090SPQ detect open loads in both ON and OFF states?

Yes - it performs dual-mode open-load detection. In the ON state, it monitors IS pin current magnitude; a near-zero value indicates open load. In the OFF state, it measures OUT pin voltage; absence of pull-down confirms open load. This eliminates reliance on external comparators or bias resistors and works across temperature and supply voltage variations.

What thermal management is required for continuous 3A operation?

At 3A and +85°C ambient, the ZXMS81090SPQ dissipates ~1.8W. With R_θJC = 5.2°C/W and R_θJA = 42°C/W (on 2oz FR4), a minimum of 6cm² copper area under the exposed pad plus ≥6 thermal vias to inner ground planes is required. For sustained operation, forced airflow or heatsink attachment to the EP pad is recommended to maintain T_J ≤ +150°C.