A3C-50P-2DSA Equivalent & Substitute Parts

Part Overview

The A3C-50P-2DSA is a rectangular connector header manufactured by Hirose Electric Co Ltd, designed for through-hole board-to-board or cable applications. This connector features 50 positions arranged in 2 rows with 0.079" (2.00mm) pitch spacing. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Pitch - Mating	0.079" (2.00mm)
Number of Positions	50
Number of Rows	2
Row Spacing - Mating	0.079" (2.00mm)
Mounting Type	Through Hole
Termination	Solder
Contact Finish - Mating	Gold
Operating Temperature Range	-55°C ~ 85°C
Current Rating	1A
Voltage Rating	200V
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitute parts for the A3C-50P-2DSA are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Pitch - Mating: 0.079" (2.00mm) - must match exactly
Number of Positions: 50 - must match exactly
Number of Rows: 2 - must match exactly
Row Spacing - Mating: 0.079" (2.00mm) - must match exactly
Connector Type: Header - must match exactly
Contact Type: Male Pin - must match exactly
Mounting Type: Through Hole - must match exactly
Termination: Solder - must match exactly
Material Flammability Rating: UL94 V-0 - must match exactly

Secondary parameters that may vary within acceptable ranges include contact length specifications, insulation height, contact material composition, and operating temperature range. Substitute parts must maintain electrical performance within the specified voltage and current ratings.

Parameter Comparison

Parameter	A3C-50P-2DSA	A3C-50P-2DSA(30)	MTMM-125-02-F-D-117	MTMM-125-02-G-D-110	MTMM-125-02-G-D-126	MTMM-125-02-G-D-135	MTMM-125-02-S-D-150	MTMM-125-02-T-D-150	MTMM-125-03-F-D-125	MTMM-125-03-F-D-150	MTMM-125-03-G-D-140
Manufacturer	Hirose Electric Co Ltd	Hirose Electric Co Ltd	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.
Connector Type	Header	Header	Header, Cuttable	Header, Cuttable	Header, Cuttable	Header, Cuttable	Header, Cuttable	Header, Cuttable	Header, Cuttable	Header, Cuttable	Header, Cuttable
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Pitch - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Number of Positions	50	50	50	50	50	50	50	50	50	50	50
Number of Rows	2	2	2	2	2	2	2	2	2	2	2
Row Spacing - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Contact Length - Mating	0.138" (4.60mm)	-	0.117" (2.97mm)	0.110" (2.79mm)	0.126" (3.20mm)	0.135" (3.43mm)	0.150" (3.81mm)	0.150" (3.81mm)	0.125" (3.18mm)	0.150" (3.81mm)	0.140" (4.66mm)
Contact Length - Post	0.102" (2.60mm)	-	0.079" (2.00mm)	0.086" (2.18mm)	0.070" (1.78mm)	0.061" (1.55mm)	0.046" (1.17mm)	0.046" (1.17mm)	0.118" (3.00mm)	0.093" (2.35mm)	0.103" (2.62mm)
Overall Contact Length	0.276" (7.00mm)	-	0.255" (6.48mm)	0.255" (6.48mm)	0.255" (6.48mm)	0.255" (6.48mm)	0.255" (6.48mm)	0.255" (6.48mm)	0.302" (7.67mm)	0.302" (7.67mm)	0.302" (7.67mm)
Insulation Height	0.035" (0.90mm)	-	0.059" (1.50mm)	0.059" (1.50mm)	0.059" (1.50mm)	0.059" (1.50mm)	0.059" (1.50mm)	0.059" (1.50mm)	0.059" (1.50mm)	0.059" (1.50mm)	0.059" (1.50mm)
Contact Shape	Square	Square	Square	Square	Square	Square	Square	Square	Square	Square	Square
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Tin	Gold	Gold	Gold
Contact Material	Brass	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Insulation Material	Polyamide (PA), Nylon	Polyamide (PA), Nylon	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)
Operating Temperature Range	-55°C ~ 85°C	-55°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Current Rating	1A	2A	3A	3A	3A	3A	3A	3A	3A	3A	3A
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	-	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The A3C-50P-2DSA is obsolete and no longer in active production. The A3C-50P-2DSA(30) serves as the direct equivalent from Hirose Electric Co Ltd, maintaining identical mechanical and electrical specifications while offering active product status and RoHS compliance.

For applications requiring alternative manufacturers, the Samtec MTMM-125 series provides functional equivalents across multiple contact length configurations. All Samtec substitutes maintain the critical parameters: 50 positions, 2 rows, 0.079" (2.00mm) pitch, through-hole solder termination, and UL94 V-0 flammability rating. Samtec parts offer enhanced operating temperature ranges (-55°C to 125°C) and ROHS3 compliance, providing superior environmental performance compared to the original specification.

Contact length variations in the Samtec series accommodate different application requirements. The MTMM-125-02 series maintains overall contact length of 0.255" (6.48mm), while the MTMM-125-03 series extends to 0.302" (7.67mm). Contact finish options include gold-plated and tin-plated variants. Selection should be based on specific board thickness, mating component requirements, and environmental compliance mandates.

Frequently Asked Questions (FAQ)

Q: Can MTMM-125 series connectors directly replace A3C-50P-2DSA in existing designs?

A: Yes, provided that contact length and overall stacking height are compatible with the PCB layout. The MTMM-125-02 series offers reduced overall contact length (0.255" vs 0.276"), while MTMM-125-03 series provides extended length (0.302"). Verify mating component clearances before substitution.

Q: What is the difference between contact finish options in the Samtec MTMM-125 series?

A: Contact finish options include gold-plated mating surfaces with tin or gold post finishes, and tin-plated mating surfaces. Gold finishes provide superior corrosion resistance and contact reliability. Tin finishes offer cost optimization for non-critical applications. Selection depends on environmental exposure and reliability requirements.

Q: Are the Samtec MTMM-125 connectors cuttable?

A: Yes, the MTMM-125 series features cuttable design, allowing customization of position count from the standard 50-position configuration. This capability is not available in the original A3C-50P-2DSA.

Q: What is the significance of the higher current rating in substitute parts?

A: Samtec MTMM-125 series connectors are rated for 3A per contact, compared to 1A for the original A3C-50P-2DSA. This represents improved electrical capacity and allows for higher power distribution applications without exceeding contact current limits.

Q: How do operating temperature ranges affect part selection?

A: The original A3C-50P-2DSA operates from -55°C to 85°C. Most Samtec substitutes extend the upper limit to 125°C, providing broader thermal operating envelope. MTMM-125-02-T-D-150 operates to 105°C. Selection should align with application thermal requirements and environmental specifications.

Q: What packaging considerations apply to these connectors?

A: The A3C-50P-2DSA(30) is supplied in bulk packaging. Samtec MTMM-125 series parts are supplied in standard packaging. Verify packaging requirements for production assembly processes and inventory management.

Q: Are all substitute parts RoHS compliant?

A: The A3C-50P-2DSA(30) is RoHS Compliant. All Samtec MTMM-125 series parts are ROHS3 Compliant, meeting current regulatory requirements for restricted substances in electrical and electronic equipment.

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