| Part Number: | ULO | - | MD481D | - | B | N | 3 | 0 | S |
|---|---|---|---|---|---|---|---|---|---|
| Explanation: |
Brand |
Model MD481A - Type 803 PCB socket |
Housing Colour B - Black |
Shell Plating N - Nickel |
Contact Count 3 - 3 contacts; MD481C/D/E only |
Contact Plating 0 - Selective gold flash |
Support X - Without M3 nut on MD481D; without outer shell on MD481E/G |
The MD481 family contains eight mechanically distinct PCB socket configurations. Select the contact layout and complete model together. Structure codes such as 803 and 824 identify a body configuration; they are not contact counts.
| Model | Structure code | Contacts | Construction | Rated current and voltage |
|---|---|---|---|---|
| ULO-MD481A | 803 | 4, 5, 6, 7 or 8 | Shielded Mini DIN socket | 2A maximum per pin; 50VDC |
| ULO-MD481B | 824 | 4, 5, 6, 7 or 8 | Mini DIN socket with forward spring-shield feature | 2A maximum per pin; 50VDC |
| ULO-MD481C | 901 | 3, 4, 5, 6, 7 or 8 | Mini DIN socket with flush front face | 2A maximum per pin; 50VDC |
| ULO-MD481D | 810 | 3, 4, 5, 6, 7 or 8 | Mini DIN socket with upper mounting bracket | 2A maximum per pin; 50VDC |
| ULO-MD481E | 422 | 3 or 4 | Projected circular face; outer shell optional | 2A maximum per pin; 50VDC |
| ULO-MD481F | 801 | 4, 5, 6, 7 or 8 | Mini DIN socket with projected front ring | 2A maximum per pin; 50VDC |
| ULO-MD481G | 804 | 4, 5, 6, 7 or 8 ordered; 3-contact face also illustrated | Larger circular socket; outer shell optional | 1A maximum per pin; 30VDC |
| ULO-MD481H | 420 | 4, 5, 6, 7 or 8 on the DIN section | DIN socket combined with an upper coaxial jack | 2A maximum per pin; 50VDC for the DIN section |
MD481H has no separately specified rating or characteristic impedance for its upper coaxial jack. The contact faces and PCB patterns differ across this family; select the drawing for the exact model and population.
| Characteristic | Value |
|---|---|
| Contact resistance | ≤30mΩ |
| Insulation resistance | ≥1000MΩ |
| Dielectric withstand test | 500VAC for 1 minute |
| Operating temperature | -20°C to +80°C |
| Insulator | Thermoplastic, material group I, UL94V-0 |
| Contacts | Copper alloy with selective gold flash |
The withstand test is separate from the working-voltage values in the model table. These characteristics describe the DIN connector section; separate coaxial-jack test conditions are unspecified.
The standard field order is insulator colour, shell finish, contact count and contact plating. Contact code 0 specifies selective gold flash. Use the numeral corresponding to the contact count; MD481G's illustrated three-contact variant has no explicit ordering code.
| Model | Colour codes | Shell-finish codes | Additional final field |
|---|---|---|---|
| MD481A | B: black; G: green; P: purple | N: nickel; 6: tin | None |
| MD481B | B: black | N: nickel; 6: tin | None |
| MD481C | B: black | N: nickel; 6: tin | None |
| MD481D | B: black | N: nickel; 6: tin | X: without nut; S: with M3 nut |
| MD481E | B: black | N: nickel; 6: tin | X: without outer shell; S: with outer shell |
| MD481F | B: black | N: nickel; 6: tin | None |
| MD481G | B: black | N: nickel | X: without outer shell; S: with outer shell |
| MD481H | B: black | N: nickel | None |
Both have a 14mm-wide, 12.9mm-high body, a 13mm depth and a 3.5mm tail projection, giving a 16.4mm total front-view height. MD481B adds a forward spring feature with a 4.85mm reference projection. Both drawings include four- through eight-contact faces.
| A/B PCB reference | Dimension |
|---|---|
| Full illustrated contact-hole pattern | 8 × Ø1mm |
| Shell slots | 3 × 2.5mm × 0.8mm |
| Transverse contact references | 2.6mm and 6.8mm; local offset 0.9mm |
| Transverse shell-slot span | 13.7mm |
| Board-edge offsets | 4.7mm, 5.5mm, 8.5mm and 11mm |
| Rear contact-column spacing | 2.5mm |
| PCB layout tolerance | ±0.05mm |
MD481C has a 14mm-wide, 13mm-high body with 12.7mm depth and 3.7mm tail projection. Its PCB pattern uses eight Ø1.2mm contact holes and three 2.5mm × 0.8mm shell slots. Transverse references are 3mm, 6.5mm and a 1mm local offset; the shell-slot span is 13.7mm. Board-edge offsets are 4.5mm, 5.5mm, 8.5mm and 11mm. PCB tolerance is ±0.05mm, and three- through eight-contact faces are illustrated.
MD481D has a 14mm-wide, 13mm-high body, 13mm depth and 3.7mm tails. The upper bracket has an R3mm crown and a mounting centre 9mm above the socket centre. Without the nut, the hole is Ø3.2mm; with the nut, it is M3×0.5 with a 1.4mm side reference. The PCB drawing specifies eight Ø1.2mm contact holes, three 2.5mm × 0.8mm slots, a 13.7mm slot span, and 3mm and 6.5mm contact references with a 1mm local offset. Board-edge offsets are 5mm, 6mm, 8.6mm and 11mm; tolerance is ±0.05mm.
MD481E has a 15.8mm-wide body, a Ø12.8mm projected circular face and a 13.4mm rear-body depth. The front projection is 4mm; the locating feature is Ø3mm with a 5.1mm side offset. Front-view heights are 7.1mm above and below the centre, with 3.7mm tails. Its three- and four-contact PCB layouts are different.
| E PCB reference | Four-contact version | Three-contact version |
|---|---|---|
| Round holes | 2 × Ø1.8mm | 2 × Ø1.8mm |
| Slot dimensions | 8 × 2.5mm × 0.8mm | Two 2.3mm × 0.8mm slots, one additional 2.3mm × 0.8mm slot and five 2.5mm × 0.8mm slots |
| Longitudinal references | 3.6mm, 7.5mm, 10.8mm and 12mm | 3.6mm, 7.9mm, 11.1mm and 12.1mm |
| Transverse references | 5mm, 6mm and 15.4mm | 5mm, 5.2mm, 6mm and 15.4mm |
| Local slot reference | 1.2mm | 1.9mm |
| PCB layout tolerance | ±0.05mm | ±0.05mm |
MD481F has a 14.5mm-wide, 13mm-high body, a 13mm depth reference, Ø11.7mm front ring and 1.5mm ring projection. Tails project 4mm. The illustrated four-contact footprint uses four Ø1.2mm holes, three 2.5mm × 0.8mm shell slots, a 6.5mm contact span and 13.9mm slot span. Longitudinal references are 3.2mm, 4mm, 7mm and 9.5mm, with ±0.05mm PCB tolerance. Additional five- through eight-contact faces are shown; their complete drill patterns are not separately dimensioned.
MD481G has a 21mm-wide, 19mm-deep body and a Ø14mm front-face reference. Front-view heights are 9.5mm above and 10mm below the centre, with 3.5mm tails. The recommended PCB pattern uses ten Ø1.5mm holes, with 10mm and 15mm transverse references and 3mm, 12.5mm, 15mm and 17.5mm longitudinal offsets; tolerance is ±0.05mm. The numbered diagrams identify three- through eight-contact faces, while the ordering chart explicitly lists four through eight.
MD481H combines a lower DIN socket with an upper coaxial jack. The upper opening is Ø3.2mm, with Ø8.4mm outer reference; the lower circular feature is Ø12.4mm. Their centres are 13.8mm apart. The mounting feature has Ø7mm outer and Ø2.5mm hole references, with a 6.8mm offset from the upper jack centre. The upper jack projects 8.5mm ahead of the body, whose depth reference is 14.4mm.
Other front references are 13mm width, 0.5mm side offset, 6.5mm upper height, 6.7mm lower height and 5mm tails, with 6mm, 12mm and 13.3mm tail spans. The PCB layout specifies two Ø1.2mm holes, two 3mm × 1.6mm slots and eight 2mm × 0.8mm slots. Longitudinal layout references are 5mm, 7mm, 9.8mm, 11mm and 14.6mm; transverse references are 4mm, 6mm, 12mm and 13.5mm. PCB tolerance is ±0.05mm. The side drawing's 9.9mm feature reference and the PCB layout's 9.8mm slot reference describe their respective views.
