46. Reset Tactile Switch Selection
1. Component Purpose
During development and testing, engineers frequently need to reset the microcontroller. A tactile push button connected to the MCU’s RESET pin provides a quick manual reset.
The switch is momentary (Off-Mom) — it is normally open and only closes while being pressed. When released, it springs back and the RESET pin returns to its normal high state.
Required: SPST-NO · Off-Mom · 6mm × 6mm · Top Actuated · Through Hole · PC Pin · 120–260gf · ≥100k cycles
2. How to Find It on DigiKey
Go to DigiKey.com → Switches → Tactile Switches
Apply these filters:
- Circuit → SPST-NO
- Switch Function → Off-Mom
- Outline → 6.00mm x 6.00mm
- Actuator Direction → Top Actuated
- Mounting Type → Through Hole
- Termination Style → PC Pin
- Part Status → Active
Tip: Operating force (gf) affects how the button feels. 120–160gf feels light and easy; 200–260gf feels firmer with more tactile feedback. Both ranges are acceptable for a reset button.
3. Key Specifications & What They Mean
| Specification | Required | Why |
|---|---|---|
| Circuit | SPST-NO | Normally open; closes on press. |
| Switch Function | Off-Mom | Momentary action; springs back on release. |
| Outline | 6mm × 6mm | Standard tactile switch footprint. |
| Actuator | Top Actuated | Button pressed from above the PCB. |
| Actuator Height | 4.3mm to 5.5mm | Enough height to reach through enclosure. |
| Operating Force | 120gf to 260gf | Comfortable press feel for manual use. |
| Mounting | Through Hole, PC Pin | Soldered into PCB. |
| Mech. Life | ≥100,000 cycles | Adequate for development/test use. |
| Temp Range | −40°C to +85°C | Standard operating range. |
4. Selecting a Safe, Production-Ready Part
The filtered list will show matching parts. Before you pick one, check: Is it Active? Is stock available? Is the manufacturer reputable? Is a datasheet available?
Full checklist: How to Select a Safe, Production-Ready Component — EWskills Guide