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| PartNumber | 39-01-2120 | 39-01-2121 | 3901-2125 |
| Description | Headers & Wire Housings 12 CKT RCPT HOUSING | Headers & Wire Housings 12 CKT PLUG HOUSING | |
| Manufacturer | Molex | Molex | - |
| Product Category | Headers & Wire Housings | Headers & Wire Housings | - |
| RoHS | Y | Y | - |
| Product | Wire Housings | Wire Housings | - |
| Type | Receptacle Housing | Plug Housing | - |
| Number of Positions | 12 Position | 12 Position | - |
| Pitch | 4.2 mm | 4.2 mm | - |
| Number of Rows | 2 Row | 2 Row | - |
| Mounting Style | Free Hanging | - | - |
| Termination Style | Crimp | - | - |
| Mounting Angle | - | - | - |
| Contact Gender | - | - | - |
| Contact Plating | - | - | - |
| Series | 5557 | 5559 | - |
| Tradename | Mini-Fit Jr. | Mini-Fit Jr. | - |
| Packaging | Bulk | Bulk | - |
| Accessory Type | - | - | - |
| Contact Type | Socket | Pin | - |
| Current Rating | 13 A | 13 A | - |
| Housing Material | Nylon | Polyamide (PA) | - |
| Voltage Rating | 600 V | 600 V | - |
| Brand | Molex | Molex | - |
| Contact Material | - | - | - |
| Flammability Rating | UL 94 V-2 | UL 94 V-2 | - |
| Row Spacing | 4.2 mm | - | - |
| Housing Gender | Female | Plug | - |
| Maximum Operating Temperature | + 105 C | + 105 C | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Product Type | Headers & Wire Housings | Headers & Wire Housings | - |
| Factory Pack Quantity | 200 | 1500 | - |
| Subcategory | Headers & Wire Housings | Headers & Wire Housings | - |
| Part # Aliases | 0039012120 39012120 5557-12R | 0039012121 39012121 5559-12P | - |
| Unit Weight | 0.084658 oz | 0.132948 oz | - |