M20-7851042 Harwin Connector (Other) In Stock
Harwin M20-7851042 is a RoHS-compliant dual-row bottom-entry socket connector with tin-over-nickel termination contacts and a 1.02 inch body, designed for reliable PCB-to-cable interconnection. Offers a compact 0.205 inch body width ideal for space-constrained board assemblies. Available from authorized distributors with worldwide shipping.
- Manufacturer
- Harwin
- Package
- Other
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- M20-7851042 Datasheet PDF
- Category
- Connector
- Temp Range
- -40.0°C to 105.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Bottom-entry mating orientation routes cables parallel to the PCB surface, reducing vertical clearance requirements in low-profile enclosures
- Tin-over-nickel termination contact finish provides corrosion resistance and solder joint reliability for wave and reflow processes
- Dual-row socket layout in a 1.02-inch body enables high pin-count connections in a compact board footprint
- RoHS-compliant construction meets current EU environmental directives for use in consumer and industrial electronics
Applications
The Harwin M20-7851042 is used in board-to-cable and board-to-wire harness assemblies in industrial automation, test instrumentation, and embedded computing systems where a low-profile bottom-entry connector is needed. Its dual-row socket format supports mixed signal and power connections, making it suitable for sensor interface boards, motor drive modules, and communication cards. The compact body and tin-plated terminations simplify hand or automated soldering in high-volume PCB manufacturing.
Specifications
| Pbfree Code | Yes |
| YTEOL | 9.1 |
| Additional Feature | BOTTOM ENTRY |
| Body Breadth | 0.205inch |
| Body Depth | 0.197inch |
| Body Length | 1.02inch |
| Body/Shell Style | SOCKET |
| Connector Type | BOARD CONNECTOR |
| Contact Finish Mating | NOT APPLICABLE |
| Contact Finish Termination | Tin (Sn) - with Nickel (Ni) barrier |
| Contact Gender | FEMALE |
| Contact Material | PHOSPHOR BRONZE |
| Contact Pattern | RECTANGULAR |
| Contact Resistance | 20mΩ |
| Contact Style | SQ PIN-SKT |
| DIN Conformance | NO |
| Filter Feature | NO |
| IEC Conformance | NO |
| Insertion Force-Max | 2.0016N |
| Insulation Resistance | 1000000000Ω |
| Insulator Color | BLACK |
| Insulator Material | POLYAMIDE |
| JESD-609 Code | e3 |
| MIL Conformance | NO |
| Mating Contact Pitch | 0.1inch |
| Mating Contact Row Spacing | 0.1inch |
| Mixed Contacts | NO |
| Mounting Option 1 | LOCKING |
| Mounting Style | STRAIGHT |
| Mounting Type | BOARD |
| Number Of Connectors | ONE |
| Number Of PCB Rows | 4 |
| Number of Rows Loaded | 2 |
| Option | GENERAL PURPOSE |
| PCB Contact Row Spacing | 2.54mm |
| Rated Current (Signal) | 3A |
| Reference Standard | UL |
| Terminal Length | 0.118inch |
| Terminal Pitch | 2.54mm |
| Termination Type | SOLDER |
| Total Number of Contacts | 20 |
| UL Flammability Code | 94V-0 |
| Withdrawl Force-Min | .30024N |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8536.69.40.40 |
| Country of Origin | Taiwan |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the mating entry direction of the M20-7851042, and why does this benefit low-profile designs?
The M20-7851042 uses a bottom-entry mating direction, meaning the mating cable or header approaches from the PCB surface side rather than perpendicular to it. This keeps the cable routed parallel to the board and reduces the vertical height above the PCB by eliminating the need for a 90-degree cable bend, saving several millimeters of clearance in slim enclosures.
How long is the M20-7851042 connector body, and how does this relate to its pin count?
The body of the M20-7851042 is 1.02 inches long and 0.205 inches wide, accommodating 2 rows of pins in a dual-row configuration. This body length supports 10 positions per row for a total of 20 positions, providing substantial connectivity density without requiring excessive board area.
What contact finish does the M20-7851042 use for termination, and how does this affect soldering?
The termination contacts use a tin with nickel barrier finish, which is compatible with standard reflow and wave solder processes used in PCB manufacturing. The nickel barrier inhibits tin whisker growth and provides a stable intermetallic bond, ensuring long-term solder joint reliability at operating temperatures up to approximately 125 degrees C.
In what kind of industrial or embedded applications is the Harwin M20-7851042 typically deployed?
The M20-7851042 is commonly deployed in industrial sensor interface modules, embedded controller boards, and test equipment where a 20-pin dual-row socket must accommodate a ribbon or discrete wire harness at low board height. Its bottom-entry style and 1.02-inch body fit within standard PCB card guides and DIN-rail mounted enclosures used in factory automation and data acquisition systems.
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