| Part Number: | ULO | - | MSS430 | - | 2 | 1 | K | R | A | S |
|---|---|---|---|---|---|---|---|---|---|---|
| Explanation: |
Code Prefix |
Model DS428 - Piano-style DIP switch |
Size or Positions 2 - MSS430: 12×12mm size |
Height or Mounting 1 - MSS430: H=4.3mm |
Housing Color K - Black; DS428 or MSS430 |
Actuator or Body U - MSS430 blue actuator |
Packing A - Polybag; MSS430 |
Cover S - MSS430 with cover |
DS428, SS428A and WMS428B provide individual DIP switch positions. MSS430 is a separate 12×12mm tactile SPST pushbutton configuration. Select by function first: its contact rating, operating life and outline differ from the DIP types.
| Model | Switch positions | Mounting | Housing and controls |
|---|---|---|---|
| DS428 | 1–12 | Through-hole, 2.54mm longitudinal pitch and 7.62mm row spacing | Piano-style option T; R red, B blue, K black, N brown housing |
| SS428A | 2–12 | V vertical through-hole or S SMT | B black housing, W white actuator |
| WMS428B | B black housing, W white actuator; Mylar film shown |
| Property | DS428 | SS428A | WMS428B |
|---|---|---|---|
| Contact resistance | ≤100mΩ | ||
| Insulation resistance | ≥1000MΩ | ||
| Operating life | At least 2000 cycles per switch | ||
| Storage temperature | -45°C to +110°C | ||
| Withstand test | Unestablished: 250VAC and 500VAC are both listed for 1 minute | 250VAC for 1 minute | |
| Working voltage / current | Unspecified | ||
| Operating-temperature range | Unspecified | ||
The withstand entries are test voltages, not working ratings. For DS428 and SS428A, the applicable test level requires an exact-part check. WMS428B's 260°C thermoplastic notation does not establish an operating temperature or a complete reflow profile.
| Model | Body / leads | Recommended PCB layout |
|---|---|---|
| DS428 | Length N×2.54mm+1.46mm; 9.90mm width. Upper outline: 5.30mm body and 10.85mm overall references. Piano outline: 8.80mm body and 13.05mm overall references, 1.50mm projection and 1.20mm actuator reference. Leads 0.60×0.20mm; 3.85mm tail reference, 4.25mm piano-side reference. | 2.54mm pitch, 7.62mm rows, Ø0.97mm holes; end-contact span (N−1)×2.54mm |
| SS428A | Length N×2.54mm+0.96mm. SMT: 9.80mm lead span, 3.60mm height reference. Vertical: 6.95mm overall and 3.60mm tail references, 0.25mm lead thickness, 0.50mm lead width. Actuator square 1mm with 0.60mm projection. | Vertical: 2.54mm pitch, 7.62mm rows, Ø0.85mm holes. SMT: 2.54mm pitch, 1.10mm pad width, 7.40mm inner and 10.40mm outer transverse spans. |
| WMS428B | Length N×2.54mm+0.96mm; 6.80mm body width, 3.10mm body-height reference. Vertical tails 3.60mm, 0.25×0.50mm pins. SMT overall height reference 3.60mm and lead span 9.80mm. | Vertical: 2.54mm pitch, 7.62mm rows, Ø0.85mm holes. SMT: 2.54mm pitch, 1.10mm pad width, 6.80mm inner and 10.80mm outer transverse spans. |
N is the number of switch positions. All illustrated PCB layouts specify ±0.05mm tolerance. Packaging codes for SS428A and WMS428B are B tube, T tray and R tape-and-reel. The SS428A ordering graphic is headed MDS428A; that original label is retained and does not establish an additional model.
| Property | MSS430 |
|---|---|
| Function | SPST tactile pushbutton; normally open schematic |
| Contact rating | 50mA at 12VDC |
| Contact resistance | ≤100mΩ |
| Insulation resistance | ≥100MΩ |
| Operating life | 10,000 cycles |
| Operating temperature | -25°C to +70°C |
| Static-load test entry | 3kgf; direction and duration incomplete, not an operating-force specification |
| Wave soldering | 260°C maximum for 5s, with 1.6mm PCB thickness |
| Manual soldering | 30W iron, approximately 320°C for 2s |
| Operating force / withstand test | Unspecified |
MSS430 is specified by its tactile-switch data and drawing. The DIP-switch pitch and 2000-cycle values are not applied to this pushbutton.
| MSS430 field | Options |
|---|---|
| Size | Code 2: 12×12mm |
| Profile H | 1: 4.3mm; 2: 5mm; 3: 7mm; 4: 7.3mm; 5: 9.5mm; 6: 13mm |
| Housing color | U blue; K black; N brown; R red; Y yellow; S salmon |
| Actuator color | U blue; K black; N brown; R red; Y yellow; S salmon |
| Packaging | A polybag; B tube; R tape-and-reel |
| Cover | X without; S with |
The MSS430 outline shows a 3.35mm housing reference, Ø7.1mm actuator reference and a 0.5mm maximum upper reference. Alternate outlines have 15mm or 18mm lead spans; no specific span is assigned to every ordering combination. The PCB pattern shows 5mm terminal-row spacing, 12.4mm inner and 15.5mm outer longitudinal spans, 1.6mm pad reference and ±0.05mm layout tolerance.
All four model entries list thermoplastic insulation, material group I, UL94V-0 and copper-alloy contacts. Specific contact plating is unspecified. The material flammability entry does not establish a product certification.
