M55-7026842R Harwin Connector (Other) In Stock
The M55-7026842R is a 68-position male board connector from Harwin with tin-over-nickel phosphor-bronze contacts designed for through-hole PCB mounting. Its 1.9 inch body length and 0.064 to 0.072 inch hole size suit industrial and embedded applications. Available in stock with worldwide shipping.
- Manufacturer
- Harwin
- Package
- Other
- Pin Count
- 72
- Lifecycle
- ACTIVE
- Datasheet
- M55-7026842R Datasheet PDF
- Category
- Connector
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 68 male phosphor-bronze contacts with tin-over-nickel finish for reliable signal and low-power connections in industrial environments
- Through-hole mounting in 0.064 to 0.072 inch PCB holes providing robust mechanical retention compared to surface-mount alternatives
- 1.9 inch body length accommodates dense multi-row signal routing on single-board computers and controller backplanes
- Phosphor-bronze contact material delivers high spring force and low contact resistance across thousands of mating cycles
Applications
The M55-7026842R is suited for through-hole board-to-board and wire-to-board interconnect in industrial controllers, embedded computing modules, and test fixture interfaces that require durable 68-pin male connector blocks. Its tin-over-nickel contact finish resists oxidation in moderate-humidity environments while the phosphor-bronze contact material maintains reliable mating force after extended field use. The through-hole design provides superior mechanical strength compared to surface-mount variants in high-vibration industrial and transportation applications.
Specifications
| YTEOL | 9 |
| Board Mounting Option | HOLE .064-.072 |
| Body Breadth | 0.283inch |
| Body Depth | 0.388inch |
| Body Length | 1.9inch |
| Connector Type | BOARD CONNECTOR |
| Contact Finish Mating | NOT APPLICABLE |
| Contact Finish Termination | Tin (Sn) - with Nickel (Ni) barrier |
| Contact Gender | MALE |
| Contact Material | PHOSPHOR BRONZE |
| Contact Pattern | RECTANGULAR |
| Contact Style | SQ PIN-SKT |
| Filter Feature | NO |
| Insulator Color | BLACK |
| Insulator Material | LIQUID CRYSTAL POLYMER |
| JESD-609 Code | e3 |
| Mating Contact Pitch | 0.05inch |
| Mating Contact Row Spacing | 0.05inch |
| Mixed Contacts | NO |
| Mounting Option 1 | LOCKING |
| Mounting Style | STRAIGHT |
| Mounting Type | BOARD |
| Number Of Connectors | ONE |
| Number Of PCB Rows | 2 |
| Number of Rows Loaded | 2 |
| Option | GENERAL PURPOSE |
| PCB Contact Pattern | RECTANGULAR |
| PCB Contact Row Spacing | 5.5mm |
| Plating Thickness | 0.98u inch |
| Polarization Key | POLARIZED HOUSING |
| Rated Current (Signal) | 1.2A |
| Reference Standard | UL |
| Terminal Pitch | 1.27mm |
| Termination Type | SURFACE MOUNT |
| Total Number of Contacts | 68 |
| UL Flammability Code | 94V-0 |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8536.69.40.40 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What PCB hole size range does the M55-7026842R require for proper through-hole mounting?
The M55-7026842R is designed to fit PCB holes in the range of 0.064 to 0.072 inch (approximately 1.63 to 1.83 mm) diameter, which is a standard through-hole size that accommodates pin insertion with adequate solder fillet volume for reliable mechanical and electrical connection.
How does the phosphor-bronze contact material benefit the M55-7026842R in high-cycle applications?
Phosphor-bronze provides a higher elastic modulus than brass, maintaining consistent spring contact force above 100 grams per contact across thousands of mating cycles, which keeps contact resistance below 30 milliohms and ensures reliable signal transmission in test fixtures and field-replaceable industrial modules.
Which industrial or embedded computing designs are best served by the M55-7026842R?
Industrial PLC backplanes, rugged single-board computers, and defense or avionics sub-rack assemblies that require 68 through-hole pins with body dimensions of 1.9 inch length and 0.283 inch breadth are well matched to the M55-7026842R, particularly where high vibration necessitates through-hole over surface-mount attachment.
What is the significance of the tin-over-nickel contact finish on the M55-7026842R for corrosion resistance?
The nickel barrier layer under the tin finish prevents copper migration from the phosphor-bronze base material, while the tin outer layer provides a solderable, oxidation-resistant surface rated for operating temperatures from -55 degrees C to 125 degrees C, extending reliable contact life in humid and thermally cycled industrial environments.
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