Choosing a Proximity Switch
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Choosing an Electrical Switch
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Miniature Panel-Mount Push-Button Switches
Sized for 4 mm or 6 mm panel cutouts, these switches are often used with circuit boards to control electronics. They actuate with a quick push. Choose switches based on their actuator color for an easy way to tell them apart.
For technical drawings and 3-D models, click on a part number.
| No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Industry Designation | Choose an Actuator Color | Switching Current @ Voltage | Max. Voltage  | Dia. | Dp. Behind Panel | Each | |
Metal Base with Solder Connection | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
For 4 mm Panel Cutout Dia. | |||||||||||
| 1 | 1 Off (Normally Open) | Springs Back (Momentary) | 2 | SPST-NO | Black | 0.5 A @ 120 V AC/ 28 V DC | 28V DC 120V AC | 0.11" | 0.53" | 0000000 | 000000 |
| 1 | 1 On (Normally Closed) | Springs Back (Momentary) | 2 | SPST-NC | Black | 0.25 A @ 120 V AC/ 28 V DC | 28V DC 120V AC | 0.11" | 0.57" | 0000000 | 00000 |
For 6 mm Panel Cutout Dia. | |||||||||||
| 1 | 1 Off (Normally Open) | Springs Back (Momentary) | 2 | SPST-NO | 1 A @ 120 V AC/ 28 V DC | 28V DC 120V AC | 0.16" | 0.67" | 00000000 | 00000 | |
| 1 | 1 Off (Normally Open) | Springs Back (Momentary) | 2 | SPST-NO | 3 A @ 120 V AC/ 28 V DC | 28V DC 120V AC | 0.16" | 0.78" | 00000000 | 0000 | |
| 1 | 1 On (Normally Closed) | Springs Back (Momentary) | 2 | SPST-NC | Black | 1 A @ 120 V AC/ 28 V DC | 28V DC 120V AC | 0.16" | 0.78" | 0000000 | 0000 |
| 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | Springs Back (Momentary) | 3 | SPDT | 6 A @ 120 V AC/ 28 V DC | 28V DC 120V AC | 0.38" | 0.76" | 00000000 | 00000 | |
| 2 | 2 Off (Normally Open) or 2 On (Normally Closed) | Springs Back (Momentary) | 6 | DPDT | White | 1 A @ 120 V AC/ 28 V DC | 28V DC 120V AC | 0.12" | 0.72" | 0000000 | 00000 |
Metal Base with Solder Connection and Push Reset | |||||||||||
For 6 mm Panel Cutout Dia. | |||||||||||
| 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | Stays Switched (Maintained) | 3 | SPDT | 6 A @ 120 V AC/ 28 V DC | 28V DC 120V AC | 0.38" | 0.76" | 00000000 | 00000 | |
| 2 | 2 Off (Normally Open) or 2 On (Normally Closed) | Stays Switched (Maintained) | 6 | DPDT | Black | 6 A @ 120 V AC/ 28 V DC | 28V DC 120V AC | 0.38" | 0.76" | 00000000 | 00000 |
Circuit Board Push-Button Switches
Send a signal from your circuit board with the push of a button. These switches are small and have pins for through-hole soldering, helping you eliminate wiring and save space on your circuit board. Also known as tactile switches, they’re the same ones you press when typing on a keyboard. You’ll also find them in control panels and interfaces.
Covers fit over projecting button switches.
For technical drawings and 3-D models, click on a part number.
| No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Industry Designation | Actuator Color | Switching Current @ Voltage | Max. Voltage | Initial Contact Resistance, mOhm | Ht. | Wd. | Dp. | For Panel Cutout Dia. | For Panel Cutout Dia. | Each | |
Plastic Actuator with Solder Connection | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Flush | |||||||||||||||
| 1 | 1 Off (Normally Open) | Springs Back (Momentary) | 4 | SPST-NO | Ivory | 50 mA @ 24 V DC | 24V DC | 100 | 0.17" | 0.24" | 0.24" | 3.5 mm | 0.16" | 0000000 | 00000 |
| 1 | 1 Off (Normally Open) | Springs Back (Momentary) | 4 | SPST-NO | Orange | 50 mA @ 24 V DC | 24V DC | 100 | 0.17" | 0.24" | 0.24" | 3.5 mm | 0.16" | 0000000 | 000 |
| 1 | 1 Off (Normally Open) | Springs Back (Momentary) | 4 | SPST-NO | Red | 50 mA @ 24 V DC | 24V DC | 100 | 0.17" | 0.24" | 0.24" | 3.5 mm | 0.16" | 0000000 | 000 |
Projecting | |||||||||||||||
| 1 | 1 Off (Normally Open) | Springs Back (Momentary) | 4 | SPST-NO | Yellow | 50 mA @ 24 V DC | 24V DC | 100 | 0.29" | 0.24" | 0.24" | 3.5 mm | 0.16" | 0000000 | 000 |
Grounded Plastic Actuator with Solder Connection | |||||||||||||||
Flush | |||||||||||||||
| 1 | 1 Off (Normally Open) | Springs Back (Momentary) | 5 | SPST-NO | Yellow | 50 mA @ 24 V DC | 24V DC | 100 | 0.17" | 0.24" | 0.24" | 3.5 mm | 0.16" | 0000000 | 000 |
DIP Switches
Configure instructions for electronic devices by sliding actuators to open or close each circuit. The actuators also make it easy to see your settings without turning on equipment. Since the contacts are gold plated, they have better conductivity and resist heat better than nickel-plated contacts. Push the contacts through holes in your circuit board, then solder them in place.
For technical drawings and 3-D models, click on a part number.
| No. of Circuits Controlled | Switch Starting Position | No. of Terminals per Slide | Industry Designation | Switching Current @ Voltage | Max. Voltage | Actuator Material | Housing Material | Contact Material | Ht. | Wd. | Dp. | For Hole Ctr.-to-Ctr. | Pkg. Qty. | Pkg. | |
| 1 | 1 Off (Normally Open) | 2 | SPST-NO | 25 mA @ 25 V DC | 50V DC | White Plastic | Red Plastic | Gold-Plated Bronze | 0.3" | 0.18" | 0.38" | 0.1" | 20 | 00000000 | 000000 |
| 2 | 1 Off (Normally Open) | 2 | SPST-NO | 25 mA @ 25 V DC | 50V DC | White Plastic | Red Plastic | Gold-Plated Bronze | 0.3" | 0.28" | 0.38" | 0.1" | 20 | 00000000 | 00000 |
| 3 | 1 Off (Normally Open) | 2 | SPST-NO | 25 mA @ 25 V DC | 50V DC | White Plastic | Red Plastic | Gold-Plated Bronze | 0.3" | 0.38" | 0.38" | 0.1" | 20 | 00000000 | 00000 |
| 4 | 1 Off (Normally Open) | 2 | SPST-NO | 25 mA @ 25 V DC | 50V DC | White Plastic | Red Plastic | Gold-Plated Bronze | 0.3" | 0.48" | 0.38" | 0.1" | 20 | 00000000 | 00000 |
| 5 | 1 Off (Normally Open) | 2 | SPST-NO | 25 mA @ 25 V DC | 50V DC | White Plastic | Red Plastic | Gold-Plated Bronze | 0.3" | 0.58" | 0.38" | 0.1" | 20 | 00000000 | 00000 |
| 6 | 1 Off (Normally Open) | 2 | SPST-NO | 25 mA @ 25 V DC | 50V DC | White Plastic | Red Plastic | Gold-Plated Bronze | 0.3" | 0.68" | 0.38" | 0.1" | 20 | 00000000 | 00000 |
| 8 | 1 Off (Normally Open) | 2 | SPST-NO | 25 mA @ 25 V DC | 50V DC | White Plastic | Red Plastic | Gold-Plated Bronze | 0.3" | 0.88" | 0.38" | 0.1" | 20 | 00000000 | 00000 |
Circuit Board DC Magnetic-Object Proximity Switches
Send signals in response to changing magnetic fields to trigger processes or monitor position, speed, and current. These switches communicate with devices such as programmable logic controllers (PLCs) and microcontrollers. They’re also known as hall effect sensors. To install, push their contacts through holes in a circuit board, then solder them in place.
Maintained switches change their output signal based on the polarity of a magnetic field. They’re often used to monitor movement, such as tracking the speed and position of a shaft. These switches output a high-voltage signal when they detect a north pole, and a low-voltage signal for a south pole. When the magnetic field is removed, they maintain the same output signal.
Momentary switches change their output signal based on whether a magnetic field is present. They’re often used to trigger a process in response to changing magnetic fields, such as turning on a light when a door opens. When they detect a north or south pole, they output a low-voltage signal. When they don’t detect a magnetic field at all, they output a high-voltage signal.
For technical drawings and 3-D models, click on a part number.
| Switch Action | Switch Starting Position | Setpoint, G | Approximate Difference Between Setpoint and Reset Point, G | Switching Frequency, kHz | Switching Current @ Voltage | Max. Voltage | Wire Dia. | Lg., mm | Wd., mm | Ht., mm | Temp. Range, °F | Pkg. Qty. | Pkg. | |
Plastic Housing | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maintained | 1 Off (Normally Open) or 1 On (Normally Closed) | 90 | __ | 10 | 5 mA @ 24 V DC | 24V DC | 0.015" | 3 | 4 | 2 | -40° to 185° | 10 | 0000000 | 000000 |
| Momentary | 1 On (Normally Closed) | 395 | 40 | Not Rated | 0.008 mA @ 3 V DC | 5.5V DC | 0.015" | 3 | 4 | 2 | -40° to 255° | 10 | 0000000 | 00000 |
Circuit Board Magnetically Actuated Switches
Mounted to your circuit board, these switches trigger when magnetic components get near, and reset as they move away. They’re often used to turn on electronics, such as starting up a laptop when you open it. To install, push the contacts through holes in a circuit board, then solder them in place.
Switches with a plastic housing withstand impact better than switches with a glass housing. The plastic also forms an airtight seal to block out contaminants. Use them in dusty or dirty environments where an optical switch might fail.
For technical drawings and 3-D models, click on a part number.
| No. of Circuits Controlled | Switch Starting Position | Industry Designation | Switching Current @ Voltage | Max. Voltage | Wire Dia. | OD | Lg. | Specifications Met | Pkg. Qty. | Pkg. | |
| 1 | 1 Off (Normally Open) | SPST-NO | 0.5 A @ 200 V DC | 250V DC | 0.02" | 0.1" | 0.6" | UL Recognized Component, C-UL Recognized Component | 20 | 0000000 | 000000 |
| No. of Circuits Controlled | Switch Starting Position | Industry Designation | Switching Current @ Voltage | Max. Voltage | Wire Dia. | Lg. | Wd. | Ht. | Protection Type | Environmental Rating | Specifications Met | Includes | Pkg. Qty. | Pkg. | |
| 1 | 1 Off (Normally Open) | SPST-NO | 0.5 A @ 200 V DC | 250V DC | 0.02" | 0.6" | 0.1" | 0.1" | Hermetically Sealed | NEC Class I Division 2 Groups A, B, C, D | UL Recognized Component, C-UL Recognized Component | Magnet | 20 | 0000000 | 000000 |
Transistors
Amplify or control electric signals. Transistors are often used to boost weak electrical signals or as switches to rapidly control data transmission and computing signals. The transistor's leads are ordered from left to right with the flat side facing you. The incoming current you intend to control is sent to the emitter (E) for NPN transistors or the collector (C) for PNP transistors. The base (B) controls how much current flows through the transistor. Then current is output to your application through the collector pin for NPN transistors or the emitter pin for PNP transistors.
When you send current to the base, you can control the current flow between the collector and emitter leads. NPN transistors use positive current and voltage at the base to control current flowing from the collector to the emitter. PNP transistors use negative current and voltage at the base to control current flowing from the emitter to the collector.
Maximum current gain is the highest multiplication factor the transistor can boost the current.
For technical drawings and 3-D models, click on a part number.
Max. Voltage | Trade | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Max. Current, A | Collector-Emitter | Collector-Base | Emitter-Base | Max. Current Gain | Power Dissipation, W | Lg. | Wd. | Wire Dia. | Size | Number | Transistor Type | Temp. Range, °F | Pkg. Qty. | Pkg. | |
NPN Transistors with EBC Leads | |||||||||||||||
| 0.1 | 45V DC | 50V DC | 5V DC | 1,000 | 0.45 | 3/16" | 3/16" | 0.022" | TO-92 | S9014 | Bipolar Junction | -65° to 300° | 25 | 0000000 | 00000 |
| 0.2 | 40V DC | 60V DC | 6V DC | 400 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | 2N3904 | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
| 0.2 | 305V DC | 310V DC | 5V DC | 250 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | MPSA42 | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
| 0.5 | 25V DC | 40V DC | 5V DC | 400 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | S8050 | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
| 0.6 | 40V DC | 75V DC | 6V DC | 300 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | 2N2222A | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
| 0.6 | 160V DC | 180V DC | 6V DC | 300 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | 2N5551 | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
NPN Transistors with ECB Leads | |||||||||||||||
| 0.15 | 50V DC | 60V DC | 5V DC | 700 | 0.4 | 3/16" | 3/16" | 0.022" | TO-92 | 2SC1815 | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
| 0.15 | 50V DC | 60V DC | 5V DC | 700 | 0.4 | 3/16" | 3/16" | 0.022" | TO-92 | 2SC945 | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
NPN Transistors with CBE Leads | |||||||||||||||
| 0.1 | 45V DC | 50V DC | 6V DC | 800 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | BC547B | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
| 0.8 | 45V DC | 50V DC | 5V DC | 630 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | BC337B | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
PNP Transistors with EBC Leads | |||||||||||||||
| -0.6 | -150V DC | -160V DC | -5V DC | 300 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | 2N5401 | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
| -0.6 | -60V DC | -60V DC | -5V DC | 300 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | 2N2907A | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
| -0.5 | -25V DC | -40V DC | -5V DC | 400 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | S8550 | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
| -0.2 | -305V DC | -310V DC | -5V DC | 250 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | MPSA92 | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
| -0.2 | -40V DC | -40V DC | -5V DC | 400 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | 2N3906 | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
PNP Transistors with ECB Leads | |||||||||||||||
| -0.15 | -50V DC | -50V DC | -5V DC | 700 | 0.4 | 3/16" | 3/16" | 0.022" | TO-92 | 2SA1015 | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
| -0.1 | -50V DC | -60V DC | -5V DC | 600 | 0.25 | 3/16" | 3/16" | 0.022" | TO-92 | A733 | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
PNP Transistors with CBE Leads | |||||||||||||||
| -0.8 | -45V DC | -50V DC | -5V DC | 630 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | BC327B | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
| -0.1 | -45V DC | -50V DC | -5V DC | 800 | 0.625 | 3/16" | 3/16" | 0.022" | TO-92 | BC557B | Bipolar Junction | -65° to 300° | 25 | 0000000 | 0000 |
| No. of Pieces | Includes | Lg. | Wd. | Wire Dia. | Trade Size | Transistor Type | Temp. Range, °F | Each | |
| 190 | S9014—NPN Transistor with EBC Leads (10 Pieces) 2N3904—NPN Transistor with EBC Leads (10 Pieces) MPSA42—NPN Transistor with EBC Leads (10 Pieces) S8050—NPN Transistor with EBC Leads (10 Pieces) 2N2222A—NPN Transistor with EBC Leads (10 Pieces) 2N5551—NPN Transistor with EBC Leads (10 Pieces) 2SC1815—NPN Transistor with ECB Leads (10 Pieces) 2SC945—NPN Transistor with ECB Leads (10 Pieces) BC547B—NPN Transistor with CBE Leads (10 Pieces) BC337B—NPN Transistor with CBE Leads (10 Pieces) 2N5401—PNP Transistor with EBC Leads (10 Pieces) 2N2907A—PNP Transistor with EBC Leads (10 Pieces) S8550—PNP Transistor with EBC Leads (10 Pieces) MPSA92—PNP Transistor with EBC Leads (10 Pieces) 2N3906—PNP Transistor with EBC Leads (10 Pieces) 2SA1015—PNP Transistor with ECB Leads (10 Pieces) A733—PNP Transistor with ECB Leads (10 Pieces) BC327B—PNP Transistor with CBE Leads (10 Pieces) BC557B—PNP Transistor with CBE Leads (10 Pieces) | 3/16" | 3/16" | 0.022" | TO-92 | Bipolar Junction | -65° to 300° | 0000000 | 000000 |