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Mini PIR Sensor



The Mini PIR Sensor features a compact size board and can be mounted in a project through a hole in a case (only the PIR lens showing with all the electronics hidden inside the case). This makes it ideal in applications where users need to track movements with a small device or in projects that have to be sealed from high-humidity environments. The Mini PIR Sensor is a pyroelectric device, and it detects motion by sensing changes in the infrared levels emitted by surrounding objects. When motion is detected, the Mini PIR Sensor outputs a high signal on its output pin.

ST-00082 Mini PIR Sensor Back 1280x1280.JPG ST-00082 Mini PIR Sensor Front 1280x1280.JPG ST-00082 Mini PIR Sensor w coin 1280x1280.JPG

ST-00082 Rev B


Revision History

The original Mini PIR main IR sensor component became obsolete. Once the main sensor became unavailable, we revised the design to include a new IR sensor component, increasing the revision to Rev B. The new IR sensor parts works with lower voltage so we had to add other supporting components, including a voltage regulator. Rev B performance is similar to the original version, but now requiring a maximum power supply voltage of 6 V.

Product Features

  • Single bit output
  • Small size that can be mounted through a hole (Recommended drill 7/16" or 11mm)
  • Voltage supply 2.7 V to 6 V
  • Low working current (28uA @ 3VDC, 18uA @ 5VDC)
  • Detects movement up to 12ft away (depending on current environment temperature conditions)
  • 100˚ detection angle
  • 3-pin SIP package perfect for breadboard-friendly projects (you can also connect the PIR using a standard servo extension cable without having to add any extra components)
  • Output is activated for about 3.5 seconds after motion is detected
  • Output stays activated for as long as motion is detected

Technical Details

  • Voltage requirements: 2.7 to 6 VDC
  • Communication: Single-bit high/low output
  • Dimensions: 1.16 x 0.49 x 0.49 in (29.5 x 12.5 x 12.5 mm)
  • Operating temperature range: 32 to 122 °F (0 to 50 °C)
  • The module includes an on-board 10K Ohm resistor in series with the output (no extra resistor is needed to drive a transistor in most cases).
  • Maximum Output Current:
    • 290 uA at 3 V
    • 325 uA at 5 V

Application Ideas

  • Security Alarm
  • Motion-activated nightlight
  • Holiday animated props

Warning: Voltage- and Static-sensitive Device

  • The Mini PIR Sensor is a delicate, static-sensitive device requiring proper voltage
  • Observe proper anti-static techniques when handling this sensor
  • Disconnect all power before connecting or disconnecting the module to a circuit
  • Do not reverse polarity of the power connections, it could damage the device

Module Dimensions

Dimensions ST-00082.jpg ST-00082-Product Size.jpg

Pin Definitions

Pin Symbol Type Function
1 GND Ground Ground(0V)
2 VDD Power Power supply
3 OUT Output PIR signal; HIGH = movement/ LOW = no movement


Symbol Description Minimum Typical Maximum Units
VDD Supply Voltage 2.7 5.0 6.0 V
ICC Supply Current(No load) 28 190 1,200 uA
GND Ground reference connection - 0 - V
VOH Signal high (output) - 3.0 - V
VOL Signal low (output) 0 0 0.3 V

Typical Application

Connect to 3.3V or 5V microcontroller. (It can be connected directly to the microcontroller without using a resistor)

ST-00082-Connection Diagram.jpg Connection ST-00082.jpg

Spectral Response

In most cases the PIR plastic lens will be exposed directly to the area that should be sensing so almost nobody would care about the spectral response of this PIR sensor. A couple of customers mentioned that they will have to enclose their whole projects behind some translucent material and they needed to know which kind of infrared (which wavelength) should be able to pass through their material.

This PIR sensor and the lens are optimized to work with IR light wavelength from 5.5 to 14 um. The graphic below shows the information in a graphic.


Resources and downloads