| PartNumber | 39-01-2120 | 39-01-2126 | 39-01-2121 |
| Description | Headers & Wire Housings 12 CKT RCPT HOUSING | Headers & Wire Housings 12 CKT PLUG HOUSING | Headers & Wire Housings 12 CKT PLUG HOUSING |
| Manufacturer | Molex | Molex | Molex |
| Product Category | Headers & Wire Housings | Headers & Wire Housings | Headers & Wire Housings |
| RoHS | Y | Y | Y |
| Product | Wire Housings | Wire Housings | Wire Housings |
| Type | Receptacle Housing | Plug Housing | Plug Housing |
| Number of Positions | 12 Position | 12 Position | 12 Position |
| Pitch | 4.2 mm | 4.2 mm | 4.2 mm |
| Number of Rows | 2 Row | 2 Row | 2 Row |
| Mounting Style | Free Hanging | - | - |
| Termination Style | Crimp | - | - |
| Mounting Angle | - | - | - |
| Contact Gender | - | - | - |
| Contact Plating | - | - | - |
| Series | 5557 | 5559 | 5559 |
| Tradename | Mini-Fit Jr. | Mini-Fit Jr. | Mini-Fit Jr. |
| Packaging | Bulk | Bulk | Bulk |
| Accessory Type | - | - | - |
| Contact Type | Socket | Pin | Pin |
| Current Rating | 13 A | 13 A | 13 A |
| Housing Material | Nylon | Polyamide (PA) | Polyamide (PA) |
| Voltage Rating | 600 V | 600 V | 600 V |
| Brand | Molex | Molex | Molex |
| Contact Material | - | - | - |
| Flammability Rating | UL 94 V-2 | UL 94 V-0 | UL 94 V-2 |
| Row Spacing | 4.2 mm | - | - |
| Housing Gender | Female | Plug | Plug |
| Maximum Operating Temperature | + 105 C | + 105 C | + 105 C |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Product Type | Headers & Wire Housings | Headers & Wire Housings | Headers & Wire Housings |
| Factory Pack Quantity | 200 | 200 | 1500 |
| Subcategory | Headers & Wire Housings | Headers & Wire Housings | Headers & Wire Housings |
| Part # Aliases | 0039012120 39012120 5557-12R | 0039012126 39012126 5559-12P-210 | 0039012121 39012121 5559-12P |
| Unit Weight | 0.084658 oz | 0.134112 oz | 0.132948 oz |