Product Overview
C&K EP11 Sealed SMT Momentary Pushbutton - SPST-NO, 0.4VA, IP57, Gold Contacts
Condition
Unused NOS. Evaluation: Visual inspection only. Function testing not performed. Body markings legible: C&K, USA, EP11, 0.4VA MAX, code 003. Six SMT pins present, no visible damage. Sourced from legacy electronics supply chains.
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Product Overview
C&K EP11 sealed tiny pushbutton switch in surface mount configuration. Momentary action (Off-Mom), SPST-NO contact configuration. Rated 0.4VA max at 20V AC or DC. IP57 sealed construction protects against dust ingress and temporary immersion, making it suitable for board-level assemblies exposed to cleaning processes and harsh environments.
Key Features
- Contact configuration: SPST-NO (Single Pole, Single Throw, Normally Open)
- Switch action: Momentary (Off-Mom)
- Electrical rating: 0.4VA max at 20V AC or DC max
- Mounting: Surface mount (SMT)
- IP57 sealed - protected against harmful dust deposit and temporary immersion
- Plunger actuator style
- Operating temperature: -30°C to 85°C
- White plastic body with metal actuator bar; six SMT pads
Applications
- Replacing a failed pushbutton on a PCB during bench repair - desolder the old switch, drop in the EP11, reflow, done
- Integrating a reset or mode-select button into a custom microcontroller board where board real estate is tight
- Prototyping user-interface controls for telecom or networking equipment before committing to a production PCB run
- Adding a tactile trigger input to a hobbyist synthesizer, controller, or embedded project that needs a low-current momentary switch
- Drop-in service replacement for original C&K EP11 switches in instrumentation and control panels
Frequently Asked Questions
Is this a surface mount or through-hole version?
Surface mount. The unit photos confirm six SMT pads and a white SMT body. If your design calls for through-hole termination, verify the full C&K part number suffix before ordering - the EP series includes both SMT and through-hole variants.
What does SPST-NO mean for my circuit?
Single Pole, Single Throw, Normally Open. The circuit is open at rest and closes only while the button is pressed. When released, it returns to open. This is a momentary switch - it does not latch.
Can I use this in a high-current application?
No. The EP11 is rated 0.4VA max at 20V AC or DC. It is designed for low-level signal switching. Using it in high-power applications will cause premature failure.
Does this require an actuator cap?
The switch ships with the plunger actuator visible - no cap included. If your application requires a specific button cap style or color, verify cap compatibility with the EP11 actuator before ordering separately.
What is the IP57 rating?
IP57 means the switch is protected against harmful dust deposit (5) and temporary immersion in water (7). The sealed construction also protects against solder flux and board cleaning processes during PCB assembly.
The EP11 has been keeping circuits honest since the days when sealed SMT switches were a genuine engineering flex. Unused, marked, and ready to solder - your next build picks up exactly where the last one left off.
