Product details

Applications Metal proximity detection, Encoders/event counters Number of input channels 1 Vs (Max) (V) 3.46 Vs (Min) (V) 1.71 Operating temperature range (C) -40 to 125
Applications Metal proximity detection, Encoders/event counters Number of input channels 1 Vs (Max) (V) 3.46 Vs (Min) (V) 1.71 Operating temperature range (C) -40 to 125
WSON (DSG) 8 4 mm² 2 x 2
  • Threshold tolerance: <1 % of coil diameter
  • Temperature stable switching operation
  • Average Supply Current: < 20 µA @ 10 sps
  • Shutdown Supply Current: 140 nA
  • Push-pull output
  • Resistor Programmable Threshold
  • Insensitive to DC Magnetic Fields
  • Contactless Switching Operation
  • Sample Rate up to 4 ksps
  • Supply Voltage: 1.8 V – 3.3 V
  • Operating Temperature Range: –40 to 125 °C
  • Threshold tolerance: <1 % of coil diameter
  • Temperature stable switching operation
  • Average Supply Current: < 20 µA @ 10 sps
  • Shutdown Supply Current: 140 nA
  • Push-pull output
  • Resistor Programmable Threshold
  • Insensitive to DC Magnetic Fields
  • Contactless Switching Operation
  • Sample Rate up to 4 ksps
  • Supply Voltage: 1.8 V – 3.3 V
  • Operating Temperature Range: –40 to 125 °C

The LDC0851 is a close range inductive switch ideal for contactless and robust applications such as presence detection, event counting, and simple buttons.

The switch is triggered when a conductive object comes within close proximity of the sensing coil. Hysteresis is included to ensure a reliable switching threshold immune to mechanical vibration. The differential implementation prevents false triggering over environmental factors such as temperature variation or humidity effects.

Inductive sensing technology provides reliable and accurate sensing even in the presence of dirt, oil, or moisture making it ideal for use in harsh or dirty environments. The solid state switching eliminates the failures due to reed, mechanical, or contact switching. Unlike competitive products, the LDC0851 does not require magnets, nor is it affected by DC magnetic fields.

The LDC0851 is a close range inductive switch ideal for contactless and robust applications such as presence detection, event counting, and simple buttons.

The switch is triggered when a conductive object comes within close proximity of the sensing coil. Hysteresis is included to ensure a reliable switching threshold immune to mechanical vibration. The differential implementation prevents false triggering over environmental factors such as temperature variation or humidity effects.

Inductive sensing technology provides reliable and accurate sensing even in the presence of dirt, oil, or moisture making it ideal for use in harsh or dirty environments. The solid state switching eliminates the failures due to reed, mechanical, or contact switching. Unlike competitive products, the LDC0851 does not require magnets, nor is it affected by DC magnetic fields.

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Technical documentation

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Type Title Date
* Data sheet LDC0851 Differential Inductive Switch datasheet (Rev. A) 16 Jan 2016
Application note Common Inductive and Capacitive Sensing Applications (Rev. B) 22 Jun 2021
Application note Simulate Inductive Sensors Using FEMM (Finite Element Method Magnetics) (Rev. A) 16 Jun 2021
Application note LDC Device Selection Guide (Rev. D) 15 Jun 2021
Application note Sensor Design for Inductive Sensing Applications Using LDC (Rev. C) 21 May 2021
Application note LDC Target Design (Rev. B) 13 May 2021
Application note LDC0851 Quick-Start Guide (Rev. A) 07 Feb 2020
Technical article Understanding tamper detection sensors 18 Nov 2019
Technical article An open-and-shut case, part 2: advantages of inductive-based case tamper detection in smart meters 29 Nov 2018
Technical article An open-and-shut case, part 1: limitations of mechanical case tamper detection in smart meters 15 Nov 2018
Application note LDC0851 Stacked Coil Design Considerations 12 Feb 2018
User guide LDC0851EVM User's Guide (Rev. A) 30 Jul 2017
Application note EMI Considerations for Inductive Sensing 22 Feb 2017
Technical article Inductive sensing: reliably detect faults in circuit breakers using contactless inductive switches 17 Jan 2017
Application note LDC0851 - Troubleshooting 03 Jan 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LDC0851EVM — LDC0851EVM - High Accuracy Inductive Switch with Stacked Coils Evaluation Module

The LDC0851 evaluation module demonstrates inductive sensing technology to accurately detect the presence of a conductive target passing a fixed threshold. The evaluation module includes a perforated and interchangeable 4-layer PCB where both the sensing coil and reference coil are stacted for (...)

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Simulation model

LDC0851 IBIS Model

SLYM096.ZIP (29 KB) - IBIS Model
Calculation tool

Inductive Sensing Design Calculator Tool (Rev. G)

SLYC137G.ZIP (3737 KB)
Reference designs

TIDA-00828 — Inductive Sensing 32-Position Encoder Knob Reference Design using the LDC0851

An inductive sensing based incremental encoder knob design can provide a robust and low-cost interface for control inputs.  It can reliably operate in environments which have dirt, moisture, or oil which would pose issues for alternate sensing technologies. This solution requires no magnets.
Reference designs

TIDA-01377 — Case Tamper Detection Reference Design Using Inductive Sensing

The physical case surrounding a smart meter is the first line of defense against tampering. Smart meter designs must incorporate some way to detect when the meter case is opened in order to alert service providers to a possible tamper attack.  This reference design implements a new method for (...)
Reference designs

TIDA-00851-LDC0851 — LDC0851 Event Counting Reference Design

An inductive sensing (LDC)-based event counting design providing a robust and low-cost interface for speed measurement and event counting applications.  The solution doesn't require magnets and reliably operates in environments with dirt, moisture or oil that usually pose challenges for (...)
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WSON (DSG) 8 View options

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