A3C-50DA-2DSA Equivalent & Substitute Parts

Part Overview

The A3C-50DA-2DSA is a 50-position rectangular receptacle connector manufactured by Hirose Electric Co Ltd, designed for board-to-board or cable applications with 0.079" (2.00mm) pitch spacing. This connector features gold-plated mating contacts, through-hole solder termination, and push-pull fastening. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the A3C-50DA-2DSA is determined by the following critical parameters:

50-position receptacle configuration with female socket contacts
0.079" (2.00mm) pitch and row spacing for mechanical compatibility
Through-hole solder termination and push-pull fastening mechanism
Gold-plated mating contacts for electrical performance
UL94 V-0 flammability rating for safety compliance

Substitute parts must maintain these core specifications to ensure mechanical fit, electrical continuity, and functional interchangeability within existing designs.

Parameter Comparison

Parameter	A3C-50DA-2DSA	A3C-50DA-2DSA(71)	SMM-125-01-S-D	SMM-125-01-SM-D
Manufacturer	Hirose Electric Co Ltd	Hirose Electric Co Ltd	Samtec Inc.	Samtec Inc.
Product Status	Obsolete	Active	Active	Active
Number of Positions	50	50	50	50
Pitch - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Number of Rows	2	2	2	2
Row Spacing - Mating	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
Termination	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Finish - Mating	Gold	Gold	Gold	Gold
Current Rating	1A	1A	3.2A per Contact	3.2A per Contact
Voltage Rating	200VAC	200VAC	350VAC	350VAC
Operating Temperature	-55°C ~ 85°C	-55°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Insulation Material	Polybutylene Terephthalate (PBT)	Polybutylene Terephthalate (PBT)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)
Contact Material	Phosphor Bronze	Phosphor Bronze	Beryllium Copper	Beryllium Copper

Engineering Selection Recommendations

A3C-50DA-2DSA(71) is the direct equivalent from Hirose Electric Co Ltd. This part maintains identical electrical and mechanical specifications to the original A3C-50DA-2DSA while offering active product status and ROHS3 compliance. Selection of this part is appropriate for applications requiring continuity with existing Hirose connector ecosystems and where RoHS compliance is mandated.

SMM-125-01-S-D and SMM-125-01-SM-D are Samtec Tiger Eye™ SMM series alternatives that provide enhanced electrical performance characteristics. Both parts deliver higher current ratings (3.2A per contact versus 1A), elevated voltage ratings (350VAC versus 200VAC), and extended operating temperature range (-55°C to 125°C versus -55°C to 85°C). Both are ROHS3 compliant and maintain mechanical compatibility through identical pitch, row spacing, and mounting specifications. The SMM-125-01-SM-D variant is packaged in tube format with MSL classification as Not Applicable, while SMM-125-01-S-D is also tube-packaged with MSL 1 (Unlimited).

Selection between Samtec alternatives depends on packaging requirements and inventory management protocols. Both maintain full mechanical and electrical interchangeability with the original A3C-50DA-2DSA.

Frequently Asked Questions (FAQ)

Q: Can SMM-125-01-S-D and SMM-125-01-SM-D be used as direct replacements for A3C-50DA-2DSA?

A: Yes. Both Samtec parts maintain identical mechanical specifications (50 positions, 0.079" pitch, 2-row configuration, through-hole solder termination, push-pull fastening) and gold-plated mating contacts. The higher current and voltage ratings of the Samtec connectors provide enhanced performance margins without compromising compatibility.

Q: What is the difference between A3C-50DA-2DSA(71) and the original A3C-50DA-2DSA?

A: A3C-50DA-2DSA(71) is the active production variant of the same connector series. It maintains identical electrical and mechanical specifications while offering ROHS3 compliance and active product status. The primary difference is packaging format (tray versus standard packaging) and regulatory compliance status.

Q: Are there differences in insulation material between the Hirose and Samtec options?

A: Yes. The Hirose A3C series uses Polybutylene Terephthalate (PBT) insulation, while the Samtec Tiger Eye™ SMM series uses Liquid Crystal Polymer (LCP). Both materials meet UL94 V-0 flammability requirements. LCP offers superior dimensional stability and lower moisture absorption, which may provide advantages in high-reliability applications.

Q: What is the significance of the operating temperature range difference?

A: The Samtec SMM series supports operation to 125°C, compared to 85°C for the Hirose A3C series. This extended range accommodates applications with elevated ambient temperatures or thermal cycling requirements. For applications operating within the -55°C to 85°C range, both options are functionally equivalent.

Q: How do packaging formats affect part selection?

A: A3C-50DA-2DSA(71) is supplied in tray packaging, while SMM-125-01-S-D and SMM-125-01-SM-D are supplied in tube packaging. Packaging selection depends on assembly line equipment compatibility, inventory management systems, and quantity requirements. Electrical and mechanical performance is independent of packaging format.

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