Diodes Incorporated
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IntelliFET High-Side Power Switch

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The ZXMS81045SPQ is a single-channel, high-side, power switch in a SO-8EP (Type E) exposed heatsink package incorporating protective and diagnostic functions.

The device comprises a monolithic N-channel vertical power MOSFET with integrated temperature and current sensors with a charge-pumped gate supply and has a low quiescent current in OFF state. The device is enabled by active high 3.3V and 5V logic level drive to the inputs.

The device includes a diagnostic current-sense output proportional to load current and a defined diagnostic fault signal in case of overload operation, overtemperature, short-circuit or open load conditions.

IntelliFET® is a registered trademark of Diodes Incorporated.


Protection Functions

  • Reverse battery protection using external components
  • Voltage dependent current limiting
  • Overtemperature protection with auto-restart
  • Overvoltage protection including load dump
  • Stable undervoltage protection
  • ESD protection
  • Loss of ground protection with external components
  • Enhanced short circuit protection

Diagnostic Functions

  • Proportional load current-sense output
    • Linear voltage drop regulation to maintain sense accuracy even at very low load currents
    • Enabled by logic input
    • Defined temperature and current dependency
  • Open-load detection
    • Using load current-sense in ON state
    • Using output voltage detection in OFF state
  • Defined fault signal in case of overload operation, overtemperature, or short-circuit


  • Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The ZXMS81045SPQ is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF16949 certified facilities. https://www.diodes.com/quality/product-definitions/


  • High-side switching with diagnostic feedback for:
    • 12V grounded loads
    • Resistive, inductive, and capacitive loads
    • Suitable for high inrush current loads
    • Incandescent lamps (P27W/P21W), motors, etc
  • Compact low-power replacement for:
    • Relays, fuses, and discrete circuits

Product Specifications

Product Parameters

AEC Qualified Yes
Compliance (Only Automotive supports PPAP) Automotive
Channels 1
RDS(ON)  Typ. @TJ= 25°C  (mΩ) 34
RDS(ON)  Max  @TJ= 150°C  (mΩ) 90
IL(NOM)  (A) 4
IL (SC) Min (A) 25
KILIS Current Sense Ratio 1200
Recommended Operating Voltage Max (V) 18
PTOT  Max  (W) 1.6
Operating Temp Min (°C) -40
Operating Temp Max (°C) 150
Turn-OFF Time Max (µs) 230
Turn-ON Time Max (µs) 230

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