| Part Number: | ULO | - | MDS429 | - | 2 | 1 | K | K | A | S |
|---|---|---|---|---|---|---|---|---|---|---|
| Explanation: |
Prefix |
Model MDS429 - 12mm×12mm through-hole tactile switch |
Size 1 - 6mm×6mm; MDS497 or MDS497A |
Height H 1 - 4.3mm; all models |
Housing Colour K - Black; all models |
Actuator Colour K - Black; all models |
Packaging A - Polybag; all models |
Cover S - With cover; MDS429 only |
MDS429, MDS497 and MDS497A provide tactile SPST switching with model-specific body sizes, actuator heights and PCB patterns. Through-hole and surface-mount versions use different terminal geometry. Four-terminal circuits include two internally connected terminal pairs; they do not provide four independent switch poles.
| Model | Nominal body options | PCB connection | Terminal arrangement |
|---|---|---|---|
| ULO-MDS429 | 12mm × 12mm | Through-hole | Four terminals on a 12.50mm × 5.00mm pattern; two additional locating holes |
| ULO-MDS497 | 6mm × 6mm; 3mm × 6mm | Through-hole | Four-terminal 6.5mm × 4.5mm pattern or two-terminal 6.5mm spacing |
| ULO-MDS497A | 6mm × 6mm; 3mm × 6mm | SMT | Four-pad or two-pad patterns with 7.4mm pad-centre span |
| Characteristic | MDS429 | MDS497 and MDS497A |
|---|---|---|
| Switch circuit | SPST momentary, normally open | SPST momentary, normally open |
| Contact rating | Unspecified | 50mA at 12VDC |
| Contact resistance | ≤100mΩ | ≤100mΩ |
| Insulation resistance | ≥1000MΩ | ≥100MΩ |
| Withstand test | 250VAC for 1 minute | Unspecified |
| Operating life | 10000 cycles | 10000 cycles |
| Operating temperature | -20°C to +70°C | -25°C to +70°C |
| Storage temperature | -45°C to +110°C | Unspecified |
| Static-load test entry | Unspecified | 3kgf with switch placed vertically; test direction and duration not fully defined |
The MDS429 withstand test is not a continuous working-voltage rating. The 3kgf static-load entry is not an operating-force specification; operating force is not separately stated.
| Material characteristic | MDS429 | MDS497 and MDS497A |
|---|---|---|
| Housing | Engineering thermoplastic | Glass-filled thermoplastic |
| Insulating material group | I | I |
| Flammability classification | UL94V-0 | UL94V-0 |
| Contact material | Copper alloy | Copper alloy |
| Field | Code or choice |
|---|---|
| Size | 2: 12mm × 12mm |
| Profile height H | 1: 4.3mm; 2: 5.0mm; 3: 7.0mm; 4: 7.3mm; 5: 9.5mm; 6: 13.0mm |
| Housing colour | U: blue; K: black; N: brown; R: red; S: salmon; Y: yellow |
| Actuator colour | U: blue; K: black; N: brown; R: red; S: salmon; Y: yellow |
| Packaging | A: polybag; B: tube |
| Cover | X: without cover; S: with cover |
The body measures 12mm × 12mm. Four Ø1.30mm PCB holes lie on a 12.50mm × 5.00mm pattern; two Ø1.60mm locating holes use the illustrated 9.00mm separation. Recommended PCB layout tolerance is ±0.05mm. The terminal outline includes 13.9mm overall span, 0.3mm terminal thickness, 1.5mm terminal width, 3.5mm projecting section and 1.8mm end reference.
The drawing shows covered and uncovered actuator profiles, with H measured at its indicated reference. The actuator detail includes Ø7.1mm, 0.5mm maximum movement and a 3mm cover reference. In the schematic, T1/T2 form one internally connected pair and T3/T4 the other; pressing the actuator closes the connection between those pairs.
| Field | Code or choice |
|---|---|
| Size | 1: 6mm × 6mm; 2: 3mm × 6mm |
| Profile height H | 1: 4.3mm; 2: 5.0mm; 3: 7.0mm; 4: 7.3mm; 5: 9.5mm; 6: 13.0mm; 7: 12.50mm |
| Housing colour | K: black |
| Actuator colour | K: black |
| Packaging | A: polybag; B: tube |
| Configuration | PCB footprint | Actuator and terminal details |
|---|---|---|
| Four-terminal body | Four Ø1.0mm holes; 6.5mm × 4.5mm centres | Ø3.5mm actuator; 0.7mm terminal width; 0.9mm upper side reference |
| Two-terminal narrow body | Two Ø1.0mm holes; 6.5mm centres | Ø3.5mm actuator; 1mm side terminal reference |
| Four-terminal long actuator | Four Ø1.0mm holes; 6.5mm × 4.5mm centres | Ø3.3mm actuator; 0.7mm terminal width; 1mm upper side reference |
Outlines show 7.9mm overall lead span, 0.3mm terminal thickness, 3.6mm housing reference and 0.4mm maximum actuator movement. Lower lead projections are 3.5mm on the round-button outlines and 3.3mm on the long-actuator outline, with a 1.8mm end section. PCB layout tolerance is ±0.05mm. Four-terminal circuits connect 1/2 internally and 3/4 internally; the two-terminal circuit retains terminals 1 and 3.
| Field | Code or choice |
|---|---|
| Size | 1: 6mm × 6mm; 2: 3mm × 6mm |
| Profile height H | 1: 4.3mm; 2: 5.0mm; 3: 7.0mm; 4: 7.3mm; 5: 9.5mm |
| Housing colour | K: black |
| Actuator colour | K: black |
| Packaging | A: polybag; B: tube; R: tape and reel |
| Configuration | PCB footprint | Body and actuator references |
|---|---|---|
| Four-terminal body | 7.4mm pad-centre span; 4.5mm between pad rows; 1.2mm pad-width reference; 9mm overall footprint span | 6.2mm top-view body reference; 4.5mm ±0.1mm terminal-row reference; Ø3.5mm actuator; 0.7mm terminal width |
| Two-terminal narrow body | 7.4mm pad-centre span; 1.4mm pad-width reference; 9mm overall footprint span | 3.0mm actuator reference; 1.5mm upper side reference; 0.70mm terminal width |
Both drawings show a 3.5mm housing section and 0.5mm maximum actuator movement. Recommended PCB layout tolerance is ±0.05mm. The four-terminal SMT schematic connects 1/2 as one side and 3/4 as the other, with the numbers arranged differently from the through-hole drawing; the two-terminal SMT circuit uses terminals 1 and 2. Use the exact model's footprint and schematic when assigning PCB nets.
| Process | Specified condition |
|---|---|
| Wave soldering | 260°C maximum for 5 seconds, with 1.6mm PCB thickness |
| Manual soldering | 30W soldering iron controlled at approximately 320°C for approximately 2 seconds |
These conditions apply to MDS497 and MDS497A. A separate reflow profile and MDS429 soldering process are not specified.
