Product Details Portlet

D3SK Surface Mount Switch

The smallest detection switch in the industry with high precision operation. (OMRON's data as of June 2014.) (3.0 × 3.5 × 0.9 mm (W × D × H))

  • Ultra small size and ultra low profile contributing to down-sizing of sets devices.
  • A unique mechanism enables high contact reliability and high precision operation.
  • Long stroke for easy installation is available.
  • Meet a variety of applications by contact and lever variatuions.
RoHS Compliant
Model 2D/3D CAD ECAD(Download symbol,FootPrint,3DCAD)
* External site (Ultra Librarian) opens in a new window.
D3SK-A0L Download Download
D3SK-A0R Download Download
D3SK-A1L Download Download
D3SK-A1R Download Download
D3SK-B0L Download Download
D3SK-B0R Download Download
D3SK-B1L Download Download
D3SK-B1R Download Download
(*) Ultra Librarian uniquely created ECAD data based on the information provided by OMRON. Please note that OMRON does not guarantee the accuracy, concurrence or completeness of ECAD data.
Note: This web page provides an excerpt from a datasheet. Refer to Product Datasheet and other applicable documents for more information.
List of Models
Standard Lever Models
Contact form
Direction of Operation Boss of
Model Minimum packing unit
SPST-NO Right With Boss D3SK-A1R 1,000 pcs
D3SK-A1R-6 6,000 pcs
Without Boss D3SK-A0R 1,000 pcs
D3SK-A0R-6 6,000 pcs
Left With Boss D3SK-A1L 1,000 pcs
D3SK-A1L-6 6,000 pcs
Without Boss D3SK-A0L 1,000 pcs
D3SK-A0L-6 6,000 pcs
SPST-NC Right With Boss D3SK-B1R 1,000 pcs
D3SK-B1R-6 6,000 pcs
Without Boss D3SK-B0R 1,000 pcs
D3SK-B0R-6 6,000 pcs
Left With Boss D3SK-B1L 1,000 pcs
D3SK-B1L-6 6,000 pcs
Without Boss D3SK-B0L 1,000 pcs
D3SK-B0L-6 6,000 pcs
Rated voltage Resistive load
5 VDC 1 mA
Note: The ratings values apply under the following test conditions:
Ambient temperature : 20±2ºC
Ambient humidity: 65±5%
Operating frequency: 20 operations/min

Permissible operating speed
1 mm to 300 mm/s
Permissible operating frequency
Mechanical: 60 operations/min max.
Electrical: 60 operations/min max.
Insulation resistance
100 MΩ min. (at 100 VDC)
Contact resistance (initial value)
3Ω max.
Dielectric strength
100 VAC for 1 min between terminals of same polarity
Vibration resistance *1
Malfunction: 10 to 55 Hz, 1.5-mm double amplitude
Shock resistance
Destruction: 1000 m/s2 {approx. 100 G} max.
Malfunction*1: 300 m/s2 {approx. 30 G} max.
Durability *2
Mechanical: 150,000 operations min. (20 operations/min.)
Electrical: 100,000 operations min. (20 operations/min.)
Degree of protection
Ambient operating temperature
-25ºC to +85ºC (at ambient humidity of 60 % max.) (with no icing or condensation)
Ambient operating humidity
85 % max.(for +5ºC to +35ºC)
Approx. 0.02 g
Note: The data given above are initial values.
  *1 The given values apply for Total Travel Position. Close or open circuit of the contact is 1 ms max.
  *2 For testing conditions, consult your OMRON sales representative.
Operating Characteristics
The □ is replaced with the code for the contact form that you need. See the "List of Models" for available combinations of models.
Model D3SK-□□R
OF max.
0.4 N
4.95± 0.15 mm
4.7 ± 0.2 mm
3.5 ± 0.2 mm
(Unit: mm)
Right operating - without Boss

Left operating - without Boss

Right operating - with Boss

Left operating - with Boss
Note 1. Unless otherwise specified, a tolerance of ±0.15 mm applies to all dimensions described in the above figure.
  2. The operating characteristics are for operation in the A direction (↓) and B direction
(→, ←) has the same operation characteristic values as of the A direction.


●Electrical Ratings

• Confirm the contact load in order to select an appropriate switch rating.
• Do not apply an excessive electrical load to the contacts, otherwise the contacts may weld, resulting in a short circuit or burning.

●Terminal Connection

• Do not use flow soldering or hand soldering to solder terminals.
• Conduct reflow soldering within the range shown in the terminal temperature profile below.
Some reflow soldering devices have extremely high peak values. Do a test in advance to confirm proper soldering conditions.
• Do not conduct reflow soldering more than twice. Also provide a time interval of at least five minutes between the first and second reflow soldering processes to allow the Switch to return to room temperature. Heating the Switch continuously (without an interval) may cause the edges of the Switch to melt and degrade the characteristics.
• When printing for a cream solder process, a 0.13 mm screen thickness is recommended.
• Be sure to provide local ventilation.

●Printed Circuit Boards

Special attention must be paid to the handling of printed circuit boards after a Switch has been mounted onto them. Airborne PCB particles may penetrate the interior of the Switch when printed circuit boards are separated by cutting. Also, do not stack printed circuit boards that have Switches mounted on them.

●Product Specification Details

This document provides only a partial list of specifications. It is recommended that you request complete drawings and specifications prior to purchasing or using the product.

Correct Use


•The cover has the same electric potential as the COM terminal. Do not short-circuit the cover with a NO or NC terminal when mounting the cover.

•Be careful of the following points. Incorrect handling may lead to insufficient actuator return, Switch damage, or reduced durability.

- Set the operating body in line with the direction of the actuator movement, and make sure that the operating body is completely separate from the actuator when the Switch is in the free position (FP). When the actuator is operated from the crosswise direction of the Switch, make sure that the corner of the operating body has a minimum radius of R1.

- Set the Switch stroke to 70% to 100% of the overtravel (the difference between the operating position and the total travel position).
- Do not subject the Switch to operations that involve strong impact.
- Do not use the Switch as a stopper.
- Do not apply excessive loads to the cover or operate the actuator from a direction other than a specified operating direction.
- Do not use an adhesive to secure the Switch.

•A lubricant is used in the Switch. Some of the lubricant may seep out because the Switch does not have an airtight construction. Consider this possibility with respect to the usage conditions when designing or using the Switch.

●Application Environment

•Do not use the Switch in locations that are subject to toxic gas, silicon, excessive dust, excessive dirt, high temperatures, high humidity, sudden temperature changes, water splashes, or oil splashes.
•Otherwise, damage resulting by faulty contact of the Switch contacts, corrosion, or other causes, or other functional faults may occur.

●Insulation and Wiring

•Be sure that the installation conditions provide a sufficient insula- tion distance between Switch terminals and other metal parts, lands, etc.


•The Switch does not have an airtight construction, and it must not be cleaned with cleaning fluids. Malfunctions may occur if the cleaning fluid penetrates the interior of the Switch together with flux or foreign matter from the surface of the PCB.

●Confirmation with Actual Equipment

•Be sure to confirm the quality of the product under the load and environmental conditions that will be used during actual applications.