TST-125-04-G-D-RA Equivalent & Substitute Parts

Part Overview

The TST-125-04-G-D-RA is an active rectangular connector header manufactured by Samtec Inc. in the Flex Stack TST series. This through-hole, right-angle connector accommodates 50 positions at 0.100" (2.54mm) pitch and is designed for board-to-cable/wire applications. The connector features shrouded 4-wall construction with push-pull fastening and solder termination. Finding equivalent or substitute parts may be necessary due to inventory constraints, lead time requirements, or specific application compatibility needs while maintaining electrical and mechanical performance standards.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	50
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle
Shrouding	Shrouded - 4 Wall
Fastening Type	Push-Pull
Termination	Solder
Contact Shape	Square
Operating Temperature Range	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TST-125-04-G-D-RA is based on strict alignment of the following critical parameters:

Connector Type & Contact Type: Header with male pins
Position Count & Configuration: 50 positions in 2-row arrangement
Pitch Specifications: 0.100" (2.54mm) mating pitch and row spacing
Mounting & Orientation: Through-hole, right-angle mounting
Shrouding & Fastening: 4-wall shrouded construction with push-pull fastening
Termination Method: Solder termination
Compliance & Environmental: UL94 V-0 flammability rating, ROHS3 compliance, MSL 1

The substitute part 1-5103310-0 (TE Connectivity AMP Connectors) meets these core substitution criteria across all mandatory electrical and mechanical parameters.

Parameter Comparison

Parameter	TST-125-04-G-D-RA (Samtec)	1-5103310-0 (TE Connectivity)	Compatibility
Connector Type	Header	Header	Match
Contact Type	Male Pin	Male Pin	Match
Number of Positions	50	50	Match
Number of Rows	2	2	Match
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	Match
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)	Match
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Match
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall	Match
Fastening Type	Push-Pull	Push-Pull	Match
Termination	Solder	Solder	Match
Contact Shape	Square	Square	Match
Contact Finish - Mating	Gold	Gold or Gold-Palladium	Compatible
Contact Finish - Post	Gold	Tin	Different
Contact Material	Phosphor Bronze	Brass	Different
Operating Temperature Range	-55°C ~ 125°C	-65°C ~ 105°C	Partial Overlap
Material Flammability Rating	UL94 V-0	UL94 V-0	Match
Current Rating (Amps)	3.4A per Contact	1A per Contact	Different
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Match

Engineering Selection Recommendations

Both connectors are active products with ROHS3 compliance and MSL 1 rating, making them suitable for standard industrial and commercial applications. The TST-125-04-G-D-RA maintains a higher current rating of 3.4A per contact and operates across a wider temperature range (-55°C to 125°C). The 1-5103310-0 operates within -65°C to 105°C with a reduced current rating of 1A per contact. Selection between these parts should be based on the specific current and temperature requirements of the target application. Both parts share identical mechanical and electrical interface specifications, ensuring physical and functional compatibility in board-to-cable/wire configurations.

Frequently Asked Questions (FAQ)

Q: Can the 1-5103310-0 be used as a direct replacement for the TST-125-04-G-D-RA?

A: The 1-5103310-0 is mechanically and electrically compatible for applications requiring up to 1A per contact and operating temperatures between -65°C and 105°C. Applications exceeding these specifications require the TST-125-04-G-D-RA.

Q: What are the key differences between these two connectors?

A: The primary differences are current rating (3.4A vs. 1A per contact), operating temperature range (-55°C to 125°C vs. -65°C to 105°C), contact material (Phosphor Bronze vs. Brass), and post finish (Gold vs. Tin). All mechanical and mating interface parameters are identical.

Q: Are both connectors suitable for high-current applications?

A: The TST-125-04-G-D-RA is rated for 3.4A per contact and is suitable for higher-current applications. The 1-5103310-0 is rated for 1A per contact and is appropriate for lower-current signal and control applications.

Q: Do both connectors meet the same compliance standards?

A: Both connectors are ROHS3 compliant, UL94 V-0 rated, and have MSL 1 moisture sensitivity levels, meeting equivalent compliance requirements for standard industrial applications.

Q: What is the impact of different contact materials on connector performance?

A: The Phosphor Bronze contacts in the TST-125-04-G-D-RA and Brass contacts in the 1-5103310-0 provide different mechanical and electrical characteristics. Contact material selection affects durability, conductivity, and mating force. Both materials are standard for rectangular connectors in this category.

Q: Can these connectors be used interchangeably in existing designs?

A: Physical and mating interface compatibility is confirmed. However, application-specific requirements for current capacity and operating temperature must be verified before substitution.

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