The Molex Built-in SIL socket is a standard connector featuring 20 pins with a contact spacing of 4.2 mm, suitable for securely connecting electrical components. Manufactured by Molex, this socket is designed for efficient performance in electronic and electrical applications, ideal for circuit boards and wiring harnesses. This component is sold individually and comes in a bag, ensuring easy integration into various technical projects.
| Type |
Built-in SIL socket (standard) |
| Number of Positions |
20 |
| Pitch |
4.2mm |
| Number of Rows |
2 |
| Application |
Power, Wire-to-Board |
| Base unit of measure |
PC |
| Base unit of measure desc |
piece |
| Board contact surface |
Tin |
| Breakaway |
No |
| Case Material |
Nylon (NL) |
| China ro h s status |
Compliant per SJ/T 11365-2006 |
| Circuits loaded |
20 |
| Circuits maximum |
20 |
| Coating thickness (PCB side) |
0.889µm |
| Color resin |
Natural |
| Colour |
Ecru |
| Comments |
The 5566 header should be used with standard Mini-Fit female terminals. If increased amperage of up to 13A per circuit is needed, please consider using the Mini-Fit Plus HCS family 45750 terminals with 46015 headers; See Molex Product specification PS-5666-001 for current de-rating information. |
| Component type |
PCB Header |
| Connection |
Soldering |
| Connector coating thickness |
0.889µm |
| Contact Plating |
Tin |
| Cross Section |
4.2mm |
| Csa |
LR19980 |
| Current maximum per contact |
9.0A |
| Delivery unit |
800 |
| Design registration eligibility |
false |
| Durability mating cycles max |
30 |
| Duration at max process temperature seconds |
5 |
| ELV status |
Not Relevant |
| Engineering number |
5566-20A |
| Engineering Part No |
5566-20A |
| Engineering Series Name |
MINIFIT JR HDR VERT |
| Engineering Series No |
05566 |
| First mate last break |
No |
| First published date |
2007-06-08 |
| Flammability |
94V-2 |
| G a d s l/ i m d s |
Compliant with Exemption 44 |
| Glow wire capable |
No |
| Guide to mating part |
No |
| H f l h status |
Low-Halogen per IEC 61249-2-21 |
| Keying to mating part |
No |
| Lead free process capability |
WAVE |
| Lock to mating part |
Yes |
| Material metal |
Brass |
| Material plating mating |
Tin |
| Material plating termination |
Tin |
| Material resin |
Nylon |
| Material type |
Finished Goods |
| Max cycles at max process temperature |
1 |
| Max. temperature |
+105°C |
| Min. temperature |
-40°C |
| Minimum line quantity |
1600 |
| Net weight |
4.141/g |
| Nominal Current |
9A |
| Nominal Voltage |
600V |
| Orientation |
Perpendicular (to the PCB) |
| Packaging Type |
Bag |
| Pc tail length |
3.50mm |
| Pcb locator |
Yes |
| Pcb retention |
No |
| Pcb thickness recommended |
1.60mm |
| Pitch mating interface |
4.20mm |
| Pitch termination interface |
4.20mm |
| Plating min mating |
0.889µm |
| Plating min termination |
0.889µm |
| Polarized to mating part |
Yes |
| Polarized to pcb |
Yes |
| Primary pack qty |
100 |
| Process temperature max c |
240 |
| Product name |
Mini-Fit Jr. |
| Product number display |
39281203 |
| Product number hyphen |
39-28-1203 |
| Product number sap |
0039281203 |
| Reach status |
Not Contained per D(2025)7771-DC (04 Feb 2026) |
| Reference series |
5566 |
| Ro h s status |
Compliant per EU 2015/863 |
| Sampleable |
True |
| Shrouded |
Fully |
| Stackable |
No |
| Taxonomy |
PCB Headers and Receptacles |
| Temperature range operating |
-40° to +105°C |
| Termination interface style |
Through Hole |
| Ul |
E29179 |
| Upc |
800753581654 |
| Voltage maximum |
600V |
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