STMM-125-02-S-D-SM SAMTEC Connector (Other) In Stock
SAMTEC STMM-125-02-S-D-SM is a shrouded dual-row board stacking receptacle connector with split board lock mounting and a 56.16 mm body length for high-count stacking interconnects. It provides RoHS-compliant construction with a 2.54 mm pitch in a surface mount configuration. Available from authorized distributors with 1-week lead time and worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 50
- Lifecycle
- ACTIVE
- Datasheet
- STMM-125-02-S-D-SM 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
- Shrouded dual-row receptacle with split board lock mounting ensures mechanical retention and prevents connector misalignment during board stack assembly
- 56.16 mm body length in a board stacking configuration accommodates high signal count interconnects between parallel PCBs in compact stack heights
- RoHS-compliant Pb-free construction with 1-week factory lead time supports rapid procurement for production builds and engineering prototype schedules
Applications
The STMM-125-02-S-D-SM is used in multi-board stacking systems such as SBC expansion modules, FPGA mezzanine cards, and industrial computing daughterboards where a shrouded receptacle with split board lock ensures reliable mechanical and electrical connection between parallel PCBs. Its dual-row layout and long body length support high pin count stacking interfaces in rack-mounted telecom and defense electronics that demand robust mating retention. The surface mount termination style keeps the stacking connector profile low while maintaining compatibility with automated PCB assembly processes.
Specifications
| Pbfree Code | Yes |
| Factory Lead Time | 1Week |
| YTEOL | 8 |
| Additional Feature | SHROUDED |
| Board Mounting Option | SPLIT BOARD LOCK |
| Body Breadth | 0.257inch |
| Body Depth | 0.24inch |
| Body Length | 2.211inch |
| Body/Shell Style | RECEPTACLE |
| Connector Type | BOARD STACKING CONNECTOR |
| Contact Finish Mating | GOLD (30) OVER NICKEL (50) |
| Contact Finish Termination | Tin (Sn) - with Nickel (Ni) barrier |
| Contact Gender | MALE |
| Contact Material | PHOSPHOR BRONZE |
| Contact Pattern | RECTANGULAR |
| Contact Style | SQ PIN-SKT |
| DIN Conformance | NO |
| Filter Feature | NO |
| IEC Conformance | NO |
| Insulator Color | BLACK |
| Insulator Material | LIQUID CRYSTAL POLYMER |
| JESD-609 Code | e3 |
| MIL Conformance | NO |
| Mating Contact Pitch | 0.079inch |
| Mating Contact Row Spacing | 0.079inch |
| Mating Information | MULTIPLE MATING PARTS AVAILABLE |
| 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 | 4.6482mm |
| Plating Thickness | 30u inch |
| Polarization Key | POLARIZED HOUSING |
| Rated Current (Signal) | 3A |
| Reference Standard | UL |
| Terminal Pitch | 2mm |
| Termination Type | SURFACE MOUNT |
| Total Number of Contacts | 50 |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8536.69.40.40 |
| Country of Origin | Malaysia, USA |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What body dimensions and mounting style does the STMM-125-02-S-D-SM use for board stacking?
The STMM-125-02-S-D-SM has a body length of 56.16 mm (2.211 inches), a breadth of 6.53 mm (0.257 inch), and a depth of 6.10 mm (0.24 inch). It uses a split board lock mounting option on the PCB surface, providing mechanical retention that resists pull-off forces and lateral movement during board stack assembly and field servicing.
How does the shrouded receptacle design of the STMM-125-02-S-D-SM prevent mismating during board assembly?
The shroud on the STMM-125-02-S-D-SM provides a keyed mechanical guide that constrains the mating header to a single correct orientation before contacts engage. This prevents blind mating errors that could damage contacts or short adjacent pins, which is especially important in multi-board stacking systems where connectors may be obscured during assembly with stack heights exceeding 10 mm.
What pitch does the STMM-125-02-S-D-SM use, and how many positions does its dual-row layout provide?
The STMM-125-02-S-D-SM uses a 2.54 mm (0.100 inch) pitch in a dual-row configuration. Based on the 56.16 mm body length and 2.54 mm pitch, the connector accommodates approximately 50 positions per row for a total of 100 positions, providing substantial signal and power capacity for board stacking applications in computing and instrumentation.
When should a designer choose the STMM-125-02-S-D-SM over an unshielded board stacking connector?
The STMM-125-02-S-D-SM is preferable when mechanical alignment, mating guidance, and pull-off resistance are priorities, such as in field-serviceable equipment where boards are frequently inserted and removed. The split board lock increases retention force by several newtons over unshrouded alternatives, and the shroud reduces the risk of pin damage during blind mating in chassis with limited visual access to the connector area.
Related Guides
How to Choose a Digital Potentiometer: AD5204, AD5206, and AD8403 Selection Guide
Compare the AD5204, AD5206, and AD8403 multi-channel SPI digipots by channel count, resistance value, and package to choose the right Analog Devices digital potentiometer for your design.
Jun 21, 2026
AD7745 / AD7746 / AD7747 Capacitance-to-Digital Converter Design Guide
Complete application note for the AD774x CDC family: circuit design, shielding, conversion rate selection, and sourcing guidance for the AD7745, AD7746, and AD7747.
Jun 21, 2026
ECMF02-4CMX8 Common-Mode Filter with ESD Protection: Selection Guide
Compare ECMF02-4CMX8 vs ECMF02-2AMX6, ECMF04-4HSM10, and other ST ECMF filters. Choose the right 4-channel common-mode filter with ESD protection for USB 2.0.
Jun 20, 2026
AD5204 Quad Digital Potentiometer Selection Guide (2026)
How to choose the right AD5204 quad digital potentiometer: compare 10kΩ vs 100kΩ variants, TSSOP vs SOIC packages, and SPI interface options for your design.
Jun 20, 2026
Why Buy from FindMyChip
About SAMTEC
SAMTEC is a leading electronic component manufacturer. FindMyChip sources SAMTEC ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”