Product Details Portlet

A3D Lighted Pushbutton Switch (Cylindrical 8-dia.)

Lighted Pushbutton Switch with Cylindrical 18-mm × 8-dia. Body

  • Excellent illumination with even surface brightness.
  • Cylindrical body means panel cutouts can be made easily.
  • Combines miniature design with excellent operating sensitivity.
RoHS Compliant
Model 2D/3D CAD ECAD(Download symbol,FootPrint,3DCAD)
* External site (Ultra Librarian) opens in a new window.
A3DA-90A1-00ER Download Download
A3DJ-90A1-00ER Download Download
A3DT-90A1-00ER 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
Appearance Model
img A3DJ
img A3DA
img A3DT

Ordering as a Set
The model numbers used to order sets of Units are given in the following table. One set comprises the Pushbutton (LED lamp built-in), and Switch.
Appearance Degree of protection Operation Model number Color symbol for
Minimum packing unit
img IP40 Momentary A3DJ-90A1-00E□ R, Y, G, W 10 pcs
Alternate A3DJ-90B1-00E□
img Momentary A3DA-90A1-00E□
Alternate A3DA-90B1-00E□
img Momentary A3DT-90A1-00E□
Alternate A3DT-90B1-00E□
Note: 1. Enter the desired color symbol for the Pushbutton in □.
  2. All the above are solder-terminal, microload, SPST-NO, LED lamp-lighted models.

Ordering Individually
Pushbuttons and Switches can be ordered separately. Combinations that are not available as sets can be created using individual Units.

Ordering: Specify a model number from the following table.
(LED built-in)
img img img Minimum packing unit
Red A3DJ-500R A3DA-500R A3DT-500R 10 pcs
Yellow A3DJ-500Y A3DA-500Y A3DT-500Y
Green A3DJ-500GY A3DA-500GY A3DT-500GY
White A3DJ-500W A3DA-å500W A3DT-500W

Contact type Operating action Terminal type
img img img Minimum packing unit
SPST-NO Momentary Solder terminals A3DJ-7111 A3DA-7111 A3DT-7111 10 pcs
Alternative Solder terminals A3DJ-7121 A3DA-7121 A3DT-7121
Contact Rating: 30 VDC, 0.1 A (Minimum Applicable Load: 5 VDC, 1 mA)
Note: 1. Minimum allowable load: 5 VDC 1 mA (Resistive)
  2. The ratings given above are for testing under the following conditions:
1) Ambient temperature: 20 ± 2°C
2) Ambient humidity: 65 ± 5%RH
3) Operation frequency: 20 times/minute

Built-in LED Lamp
Item Color
Red Yellow (White)*2 Green
Forward voltage, VF Reference value
(See note 3.)
1.85 V 2.1 V 2.3 V
Maximum value 2.2 V 2.4 V 2.5 V
Forward current, IF Reference value 20 mA 20 mA 20 mA
Absolute maximum value 50 mA 30 mA 30 mA
Permissible dissipation, PD Absolute maximum value 110 mW 72 mW 75 mW
Reverse voltage, VR Absolute maximum value 5 V 5 V 5 V
Note: The built-in LED lamp has no limiting resistor and so it is necessary to connect an external resistor within the range shown in the above table.
(For details of calculation formulas, refer to page 8.)
  *1. Refer to Engineering Data on page 4.
  *2. The same LED lamp is used for both yellow illumination and white illumination and so the ratings are the same.

Operating frequency Mechanical: Momentary operation models:120 operations/minute max.Alternate operation models: 60 operations/minute max.( *1)
Electrical: 20 operations/minute max.
Contact Resistance (initial value) 100mΩ max.
Insulation resistance 100 MΩ min. (at 500 VDC with insulation tester)
Dielectric strength 1,000 VAC, 50/60 Hz for 1 minute between terminals of same polarity
2,000 VAC, 50/60 Hz for 1 minute between terminals of different polarity, and between each terminal and ground
1,000 VAC, 50/60 Hz for 1 minute between lamp terminals (*2)
Vibration resistance Malfunction: 10 to 55 Hz, 1.5 mm double amplitude (*3)
Shock resistance Destruction: 500 m/s2 max.
Malfunction: 150 m/s2 max. (*3)
Durability Mechanical:
Momentary operation models: 1,000,000 operations min.
Alternate operation models: 100,000 operations min.(*1)
(One operation consists of set and reset operations.)
Electrical: 100,000 operations min.
Weight Approx. 3 g
Ambient operating temperature −10°C to 55°C (with no icing or condensation)
Ambient operating humidity 35% to 85%
Ambient storage temperature −25°C to 65°C
Degree of protection IEC IP40
Electric shock protection class Class II
PTI (proof tracking index) 175
Pollution degree 3 (IEC947-5-1)
Note: *1. With alternate operation models, one operation cycle consists of set and reset operations.
  *2. The figure is for when the LED lamp is not mounted.
  *3. Indicates malfunctions of less than 1 ms.

Operating Characteristics
Operating force OF max. 2.45 N
Release force RF min. 0.196 N
Total travel TT Approx. 3.5 mm
Locktravel alternate
(See note.)
LTA min. 0.5 mm
Pretravel PT max. 2.5 mm
Note: *. Alternate operation models only.

Contact Form
Contact name Contact form
(Unit: mm)
Rectangular Models
Square Models
Round Models
Solder Terminals of SPST-NO Lighted Models

Note: 1. Unless specified, there is a tolerance of Å}0.4 mm for dimensions.

2. If the panel is to be finished (e.g., coated), make sure that the panel meets the specified dimensions after the coating.

Panel Cutouts (Top View)
Rectangular models (A3DJ) Square models (A3DA) and
round models (A3DT)

Correct Use


•Always make sure that the power is turned OFF before mounting, removing, or wiring the Switch, or performing maintenance.
•Do not tighten the mounting ring excessively using pliers or a similar tool. Excessive tightening may damage the mounting ring. (Tighten- ing torque: 0.20 to 0.29 Nm)


•When wiring, use wires of a size appropriate for the applied voltage and carry current. Perform soldering correctly under the conditions given below. Using the Switch with the wires soldered incorrectly may cause the terminals to become abnormally hot and cause a fire.
1 Hand soldering: Soldering iron tip temperature: 350°C max. within 3 seconds.
2 Dip soldering: At 350°C within 3 seconds.
Wait for one minute after soldering before exerting any external force on the solder.
•Use a non-corrosive rosin liquid for the flux.
•Perform wiring so that the wire sheaths do not come into contact with the Switch. If this is unavoidable, use wires that can withstand temperatures of 100°C min. After wiring to the Switch has been completed, ensure an appropriate insulation distance.


•The polarity of the LED is indicated on the back of the Switch. Wire the LED correctly according to the polarity.
•The built-in LED does not have a limiting resistor. Connect a limiting resistor.
•Make sure that the limiting resistor satisfies the characteristics of the built-in LED. The forward current of the built-in LED must be 8 mA minimum.
•The resistance can be calculated by using the following expression.

●Calculation Example for Limiting Resistance

●Operating Environment

•Ensure that dust, metal powder, or oil do not enter the interior of the Switch.

●Using Microloads

•Using a standard load switch for opening and closing a microload circuit may cause wear on the contacts. Use the switch within the operating range. (Refer to the diagram below.) Even when using mi- croload models within the operating range shown below, if inrush current occurs when the contact is opened or closed, it may cause the contact surface to become rough, and so decrease life expec- tancy. Therefore, insert a contact protection circuit where necessary. The minimum applicable load is the N-level reference value. This value indicates the malfunction reference level for the reliability level of 60% (λ 60) (conforming to JIS C5003). The equation, λ 60 = 0.5 x 104/times indicates that the estimated malfunction rate is less than 1/2,000,000 with a reliability level of 60%.