Molex Mini-Fit Jr Series Straight Through Hole PCB Header, 12 Contact(s), 4.2 mm Pitch, 2 Row, Shrouded
- RS Stock No.:
- 189-1401
- Mfr. Part No.:
- 39-28-1123
- Brand:
- Molex
This image is representative of the product range
Bulk discount available
Subtotal (1 box of 400 units)*
$547.60
(exc. GST)
$629.60
(inc. GST)
FREE delivery for orders over $60.00 ex GST
Temporarily out of stock
- Shipping from 11 May 2026
Need more? Click ‘Check delivery dates’ to find extra stock and lead times.
Units | Per unit | Per Box* |
|---|---|---|
| 400 - 400 | $1.369 | $547.60 |
| 800 - 1200 | $1.335 | $534.00 |
| 1600 + | $1.314 | $525.60 |
*price indicative
- RS Stock No.:
- 189-1401
- Mfr. Part No.:
- 39-28-1123
- Brand:
- Molex
Specifications
Technical data sheets
Legislation and Compliance
Product Details
Find similar products by selecting one or more attributes.
Select all | Attribute | Value |
|---|---|---|
| Brand | Molex | |
| Series | Mini-Fit Jr | |
| Product Type | PCB Header | |
| Pitch | 4.2mm | |
| Current | 9A | |
| Number of Contacts | 12 | |
| Housing Material | Nylon | |
| Number of Rows | 2 | |
| Orientation | Straight | |
| Shrouded/Unshrouded | Shrouded | |
| Mount Type | Through Hole | |
| Connector System | Wire-to-Board | |
| Contact Material | Brass | |
| Contact Plating | Tin | |
| Minimum Operating Temperature | -40°C | |
| Row Pitch | 4.2mm | |
| Termination Type | Solder | |
| Contact Gender | Male | |
| Maximum Operating Temperature | 105°C | |
| Tail Pin Length | 3.5mm | |
| Standards/Approvals | No | |
| Voltage | 600 V | |
| Select all | ||
|---|---|---|
Brand Molex | ||
Series Mini-Fit Jr | ||
Product Type PCB Header | ||
Pitch 4.2mm | ||
Current 9A | ||
Number of Contacts 12 | ||
Housing Material Nylon | ||
Number of Rows 2 | ||
Orientation Straight | ||
Shrouded/Unshrouded Shrouded | ||
Mount Type Through Hole | ||
Connector System Wire-to-Board | ||
Contact Material Brass | ||
Contact Plating Tin | ||
Minimum Operating Temperature -40°C | ||
Row Pitch 4.2mm | ||
Termination Type Solder | ||
Contact Gender Male | ||
Maximum Operating Temperature 105°C | ||
Tail Pin Length 3.5mm | ||
Standards/Approvals No | ||
Voltage 600 V | ||
- COO (Country of Origin):
- JP

Molex PCB Header, 12 Way, 2 Rows - Mini-Fit Jr Series - 39-28-1123
Add more connection options to your appliances with this PCB header from Molex. It has 12 contacts, so it lets you distribute data and power to many devices at once to enhance the versatility of your application. The unit has connections across two rows to reduce its footprint and boost the packing density of your board. Highly conductive tin-plated brass contacts form reliable connections, promoting your system's efficiency.
• Durable nylon shroud protects contacts from bending and ensures a longer service life
• Compact 4.2mm pitch easily mounts onto small PCBs
• 6A current rating means it can handle intense electrical loads
• Connectors lock to contacts, eliminating the risk of disruption from jostling
Applications
• Domestic appliances
• Lighting systems
• Server rooms
• Vehicle monitoring equipment
How do I mount this PCB header?
This device solders directly onto your board, so installation is quick.
Mini-Fit Junior 4.2mm PCB Header Connectors
Mini-Fit Junior 4.2 mm pitch PCB headers which form part of the Mini-Fit Junior power connector interconnection system. Mini-Fit Junior power connectors are able to handle up to 9A per circuit making them ideal for use in high current applications. These Mini-Fit Junior PCB headers have fully isolated terminals for protection against, debris, arcing and damage caused by mishandling. The connector housings are also scoop-proof which prevents damage to the pin terminals when mated at a severe angle. The housings of these PCB headers incorporate polarization and keying features to prevent misalignment and mismating with the receptacle. A positive locking mechanism provides a secure connection with the mating receptacle and prevents accidental unmating caused by excessive shock or vibration. An audible click indicates that the connector is fully mated. For a secure connection to the PCB versions of these Mini-Fit Junior PCB headers are available with snap-in plastic PCB peg locks. Versions are also available with PCB mounting flanges. These Mini-Fit Junior 4.2 mm PCB headers are available with a UL94V-0 or UL94V-2 housing material and with a range of contact configurations and contact platings
Features and Benefits
• Can handle Up to 9A current per circuit
• Fully isolated terminals
• Scoop-proof housings to prevent contact damage
• Polarization and keying to prevent mismating
• Positive locking mechanism for secure mating connection
• Audible click for mating confirmation
• Versions with PCB retention pegs and mounting flanges
Product Application Information
Mini-Fit Junior power connectors are ideal for use in high current, high density wire to wire and wire to board applications that require design flexibility. Applications include consumer white goods, office equipment, industrial automation equipment, industrial networks, rack-mount servers, routers and switches.
Molex Minifit Jr.™ Series
Related links
- Molex Mini-Fit Jr Series Straight Through Hole PCB Header 4.2 mm Pitch Shrouded
- Molex Mini-Fit Jr Series Right Angle Through Hole PCB Header 4.2 mm Pitch Shrouded
- Molex Mini-Fit Jr Series Vertical Through Hole PCB Header 4.2 mm Pitch Shrouded
- Molex Mini-Fit Jr Series Straight Through Hole PCB Header 4.2 mm Pitch Shrouded
- Molex Mini-Fit Jr Series Vertical Through Hole PCB Header 4.2 mm Pitch Shrouded
- Molex Mini-Fit Jr Series Straight Through Hole PCB Header 4.2 mm Pitch Shrouded
- Molex Mini-Fit Jr Series Straight Through Hole PCB Header 4.2 mm Pitch Shrouded
- Molex Mini-Fit Jr Series Straight Through Hole PCB Header 4.2 mm Pitch Shrouded
