New Product Introduction
Continuous Supply Voltage Range 32.768kHz Oscillators

ISM36 and ISM37 Series
1.62VDC to 3.63VDC Continuous Supply Voltage Range 32.768kHz SMD Oscillators

October 2019

The ILSI ISM36 and ISM37 Series are quartz crystal oscillators which provide an accurate 32.768kHz LVCMOS output. These series come in compact sizes of 2.0 x 1.6 x 0.8mm and 1.6 x 1.2 x 0.7mm, with available inclusive frequency stabilities of ±25ppm over an industrial operating range of -40°C to +85°C.

These product series enable the design engineer to eliminate the need for a separate 32.768kHz watch crystal and associated load capacitors from his design, combining LVCMOS oscillator functionality as a single footprint in the circuit. This product also features low current draw at discrete industry standard supply voltages from 1.8VDC to 3.3VDC as well as a continuous supply voltage range option of 1.62VDC to 3.63VDC.

The ISM36 and ISM37 Series offer design engineers the combination of a LVCMOS output, an accurate 32.768kHz reference, low current consumption, and a continuous voltage range option resulting in an accurate timing reference for battery operated applications demanding small footprints.


Applications that require 32.768kHz timing devices include:

  • RTC Reference Clock
  • Smart Metering
  • Industrial Control
  • IoT Devices
  • Wearables
  • Battery Management
  • Health and Wellness Devices
  • System Clock Source


  • Low Current Consumption
  • LVCMOS Output Logic
  • Continuous Supply Voltage Range
  • Compact SMD Footprint
  • AT-Cut Crystal Temperature Stability Characteristics
  • Eliminates external load capacitors
  • Pb-free, RoHS and REACH compliant

At A Glance

Product Type Crystal Clock Oscillator
Frequency Range 32.768 kHz
Op Temp Range Up to -40°C to +85°C
Frequency Stability As low as ±25ppm
Supply Voltage 1.8V, 2.5V, 2.8V, 3.0V, 3.3V,
1.62V to 3.63V Continuous (Multi-VDD)
Output Logic Type LVCMOS
Package Sizes Dimensions Series Data Sheet
1.6mm x 1.2mm ISM37 Data Sheet
2.0mm x 1.6mm ISM36 Data Sheet
Larger Package Sizes Also Available
2.5mm x 2.0mm ISM35 Data Sheet
3.2mm x 2.5mm ISM34 Data Sheet
5.0mm x 3.2mm ISM31 Data Sheet
7.0mm x 5.0mm ISM30 Data Sheet
Mounting Type Surface Mount (SMD)
Ratings RoHS, REACH, Pb-Free

Click on the links above to view complete data sheets and then contact our support team or one of our authorized distributors to order samples or to get more information.

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