STMM-120-02-T-D-SM SAMTEC Connector (Other) In Stock

Name: STMM-120-02-T-D-SM
Brand: SAMTEC
SKU: STMM-120-02-T-D-SM
Availability: InStock

Samtec STMM-120-02-T-D-SM is a 40-position dual-row board-stacking connector at 2.00 mm pitch with surface-mount termination, featuring phosphor bronze contacts with matte tin-over-nickel finish. This RoHS-compliant male header enables reliable vertical board-to-board interconnection in compact embedded systems.

ACTIVEConnectorVerified Jun 2026

Package / Visual Reference

STMM-120-02-T-D-SMOther

Quick Facts

Manufacturer: SAMTEC
Package: Other
Pin Count: 40
Lifecycle: ACTIVE
Datasheet: STMM-120-02-T-D-SM Datasheet PDF
Category: Connector
Price: From $1.3381(MOQ 12)
Temp Range: -55.0°C to 105.0°C
RoHS: Compliant
Lead Time: 3–7 business days
Shipping: DHL Express · Worldwide

What are the key features of STMM-120-02-T-D-SM?

40-position dual-row board stacking male connector at 2.00 mm pitch for high-density vertical board-to-board interconnection
Phosphor bronze contacts with matte tin (Sn) over nickel (Ni) barrier finish ensure durability across repeated mating cycles
Surface-mount (SM) termination with 0.257 × 0.19 inch body footprint supports compact PCB layouts in space-constrained designs

What is STMM-120-02-T-D-SM used for?

The STMM-120-02-T-D-SM is used in mezzanine board stacking architectures in embedded computing, industrial controllers, and wireless communication modules where 40 signals need to be interconnected between two PCBs at a 2.00 mm pitch. Its surface-mount termination and compact rectangular contact pattern make it suitable for processor expansion boards, memory daughter cards, and sensor interface modules requiring reliable repeated connect-disconnect cycles.

What are the specifications of STMM-120-02-T-D-SM?

Factory Lead Time	3Weeks
YTEOL	8
Body Breadth	0.257inch
Body Depth	0.19inch
Connector Type	BOARD STACKING CONNECTOR
Contact Finish Mating	MATTE TIN OVER NICKEL (50)
Contact Finish Termination	Matte 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 Material	POLYAMIDE
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	2.0066mm
Polarization Key	POLARIZED HOUSING
Rated Current (Signal)	3A
Terminal Pitch	2mm
Termination Type	SURFACE MOUNT
Total Number of Contacts	40
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

Where can I find the STMM-120-02-T-D-SM datasheet?

STMM-120-02-T-D-SM Datasheet Download

Official datasheet from SAMTEC

What are equivalent replacements for STMM-120-02-T-D-SM?

No known alternates. Submit an RFQ and our team can suggest alternatives.

Frequently Asked Questions

What contact material and finish does the STMM-120-02-T-D-SM use, and why does it matter for mating reliability?

The STMM-120-02-T-D-SM uses phosphor bronze contacts with matte tin (Sn) plating over a nickel (Ni) barrier. Phosphor bronze provides the spring force needed to maintain consistent contact resistance across the 40 positions, while the nickel barrier prevents tin migration into the base metal over time. This combination ensures contact resistance remains stable over hundreds of mating cycles.

How does the 2.00 mm pitch of STMM-120-02-T-D-SM benefit board-stacking designs versus 2.54 mm alternatives?

At 2.00 mm center-to-center pitch, a 40-position dual-row STMM header occupies roughly 21% less board real estate per axis compared to a 2.54 mm pitch connector with equivalent position count. This size reduction is critical in miniaturized embedded systems and IoT modules where PCB area is limited, allowing designers to place the 40-pin header within a tighter layout envelope without sacrificing signal count.

What are the body dimensions of STMM-120-02-T-D-SM and how do they affect PCB footprint planning?

The connector body measures 0.257 inch (6.53 mm) in breadth and 0.19 inch (4.83 mm) in depth. These dimensions define the minimum PCB keep-out zone around the connector. When planning board layouts for stacked assemblies, designers should account for these body dimensions plus the 2.00 mm pitch land pattern to ensure adequate clearance from adjacent components on both the host board and the mezzanine module.

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AvailabilityIn Stock

Reference Price (USD)

From $1.3381

Buy from 1pc · Factory-direct pricing

Qty.	Unit Price	Ext. Price
12+	$5.2133	$62.56
100+	$4.3000	$430.00
500+	$3.2100	$1605.00
1000+	$2.7304	$2730.42
2500+	$2.0012	$5003.00
5000+	$1.3381	$6690.50

pcs

Unit price: $5.2133 · Total: $62.56

In Stock · 24h Response · Worldwide Shipping

Direct Contact

WhatsApp Inquiry Email RFQ

Lead Time3-7 business days

MOQFrom 1 piece

ShippingDHL / FedEx / UPS

OriginChina (Authorized)

Response within 24 hours · Worldwide shipping

“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”

Marco Rossi

CTO, AutoDrive Systems, Italy

STMM-120-02-T-D-SM SAMTEC Connector (Other) In Stock

What are the key features of STMM-120-02-T-D-SM?

What is STMM-120-02-T-D-SM used for?

What are the specifications of STMM-120-02-T-D-SM?

Compliance & Regulatory

Where can I find the STMM-120-02-T-D-SM datasheet?

What are equivalent replacements for STMM-120-02-T-D-SM?

Frequently Asked Questions

What contact material and finish does the STMM-120-02-T-D-SM use, and why does it matter for mating reliability?

How does the 2.00 mm pitch of STMM-120-02-T-D-SM benefit board-stacking designs versus 2.54 mm alternatives?

What are the body dimensions of STMM-120-02-T-D-SM and how do they affect PCB footprint planning?

Related Guides

CSD87313DMS Synchronous Buck Power Stage Design Guide

STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection

C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC

STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security

Why Buy from FindMyChip

About SAMTEC

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