Equivalent & Substitute Parts for A3B-26PA-2DSA(71)

Part Overview

The A3B-26PA-2DSA(71) is a rectangular connector header manufactured by Hirose Electric Co Ltd, featuring 26 positions arranged in 2 rows with 0.079" (2.00mm) pitch. This through-hole solder-terminated connector is designed for board-to-board or cable applications with unshrouded construction and push-pull fastening. The part is currently obsolete, making equivalent substitutes 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	26
Number of Rows	2
Row Spacing - Mating	0.079" (2.00mm)
Mounting Type	Through Hole
Termination	Solder
Fastening Type	Push-Pull
Contact Shape	Square
Shrouding	Unshrouded
Material Flammability Rating	UL94 V-0
Current Rating	1A
Voltage Rating	200VAC
Operating Temperature	-55°C ~ 85°C
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following core parameters:

Pitch - Mating: 0.079" (2.00mm) — exact match required
Number of Positions: 26 — exact match required
Number of Rows: 2 — exact match required
Row Spacing - Mating: 0.079" (2.00mm) — exact match required
Connector Type: Header — exact match required
Contact Type: Male Pin — exact match required
Mounting Type: Through Hole — exact match required
Termination: Solder — exact match required
Fastening Type: Push-Pull — exact match required
Contact Shape: Square — exact match required
Shrouding: Unshrouded — exact match required
Material Flammability Rating: UL94 V-0 — exact match required

All substitute parts listed meet these mandatory criteria. Variations in contact length, insulation height, contact material composition, insulation material type, and contact finish specifications are permissible within the scope of functional equivalence, provided electrical and mechanical interface requirements remain satisfied.

Parameter Comparison

Parameter	A3B-26PA-2DSA(71)	A3B-26PA-2DSA(51)	M22-2021305	MTMM-113-02-G-D-125	MTMM-113-02-L-D-149	MTMM-113-02-S-D-149	MTMM-113-02-T-D-150	MTMM-113-03-G-D-120	MTMM-113-03-G-D-145	MTMM-113-03-S-D-149	MTMM-113-03-T-D-140
Manufacturer	Hirose Electric Co Ltd	Hirose Electric Co Ltd	Harwin Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.
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	26	26	26	26	26	26	26	26	26	26	26
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)
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
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
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Shape	Square	Square	Square	Square	Square	Square	Square	Square	Square	Square	Square
Shrouding	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Unshrouded
Contact Length - Mating	0.138" (4.60mm)	0.138" (4.60mm)	0.138" (4.60mm)	0.125" (3.18mm)	0.149" (3.78mm)	0.149" (3.78mm)	0.150" (3.81mm)	0.120" (3.05mm)	0.145" (3.70mm)	0.149" (3.78mm)	0.140" (4.66mm)
Contact Length - Post	0.102" (2.60mm)	0.102" (2.60mm)	0.134" (3.40mm)	0.071" (1.80mm)	0.047" (1.20mm)	0.047" (1.20mm)	0.046" (1.17mm)	0.123" (3.12mm)	0.098" (2.50mm)	0.094" (2.40mm)	0.103" (2.62mm)
Overall Contact Length	0.311" (7.90mm)	0.311" (7.90mm)	0.331" (8.40mm)	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)	0.302" (7.67mm)
Insulation Height	0.071" (1.80mm)	0.071" (1.80mm)	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 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	Polyamide (PA6T), Nylon 6T	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)
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold	Gold	Tin	Gold	Gold	Gold	Tin
Contact Finish - Post	Tin	Tin	Not specified	Gold	Tin	Tin	Tin	Gold	Gold	Tin	Tin
Current Rating	1A	1A	1A per Contact	3A	3A	3A	3A	3A	3A	3A	3A
Operating Temperature	-55°C ~ 85°C	-55°C ~ 85°C	-40°C ~ 105°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	-55°C ~ 105°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
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The A3B-26PA-2DSA(71) is obsolete and no longer in active production. Direct substitution within the Hirose A3 series is available through A3B-26PA-2DSA(51), which maintains identical electrical and mechanical specifications while offering active product status and RoHS compliance.

For applications requiring enhanced thermal performance or higher current capacity, Samtec MTMM-113 series connectors provide superior operating temperature ranges (-55°C to 125°C) and increased current ratings (3A per contact). These alternatives employ Liquid Crystal Polymer insulation and phosphor bronze contacts, delivering improved reliability in demanding environments.

Harwin M22-2021305 offers an intermediate option with active status, cuttable header construction, and extended operating temperature range (-40°C to 105°C), suitable for applications requiring design flexibility.

All listed substitutes maintain UL94 V-0 flammability compliance and MSL 1 moisture sensitivity ratings. Selection should prioritize product status (active vs. obsolete), compliance certifications (RoHS3), and thermal/current requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can A3B-26PA-2DSA(51) be used as a direct replacement for A3B-26PA-2DSA(71)?

A: Yes. Both parts share identical pitch (0.079"), position count (26), row configuration (2), contact type (male pin), mounting method (through-hole solder), and fastening mechanism (push-pull). The primary difference is product status: A3B-26PA-2DSA(51) is active and RoHS compliant, while A3B-26PA-2DSA(71) is obsolete.

Q: What are the key differences between Hirose A3 and Samtec MTMM-113 series?

A: Core interface parameters are identical (pitch, position count, row spacing, contact type, mounting, termination, fastening). Differences include contact material (Hirose uses brass; Samtec uses phosphor bronze), insulation material (Hirose uses polyamide; Samtec uses LCP), operating temperature range (Hirose -55°C to 85°C; Samtec -55°C to 125°C), and current rating (Hirose 1A; Samtec 3A). Contact length and overall connector height vary across MTMM-113 variants.

Q: Are Samtec MTMM-113 connectors mechanically compatible with the original A3B-26PA-2DSA(71)?

A: Mechanical compatibility is determined by pitch, position count, row spacing, contact type, and fastening mechanism—all of which are identical. However, variations in overall contact length and insulation height may affect mating depth and stacking height. Board layout and mating connector specifications must be evaluated for each application.

Q: Which substitute offers the best thermal performance?

A: Samtec MTMM-113 series connectors support operating temperatures up to 125°C, compared to 85°C for the original A3B-26PA-2DSA(71) and 105°C for Harwin M22-2021305. MTMM-113-02-G-D-125, MTMM-113-02-L-D-149, MTMM-113-02-S-D-149, MTMM-113-03-G-D-120, MTMM-113-03-G-D-145, and MTMM-113-03-S-D-149 all support -55°C to 125°C operation.

Q: What is the significance of contact finish variations in the MTMM-113 series?

A: Contact finish affects corrosion resistance and mating force characteristics. Gold-finished mating contacts (MTMM-113-02-G-D-125, MTMM-113-03-G-D-120, MTMM-113-03-G-D-145) provide superior corrosion resistance. Tin-finished mating contacts (MTMM-113-02-T-D-150, MTMM-113-03-T-D-140) offer cost efficiency. Post finish (gold or tin) affects solder joint reliability and long-term performance.

Q: Are all substitute parts RoHS compliant?

A: A3B-26PA-2DSA(51) is RoHS Compliant. All Samtec MTMM-113 variants and Harwin M22-2021305 are ROHS3 Compliant. The original A3B-26PA-2DSA(71) does not specify RoHS status.

Q: What is the difference between MTMM-113-02 and MTMM-113-03 variants?

A: The primary difference is contact length and post length. MTMM-113-02 variants feature shorter overall contact lengths (0.255" / 6.48mm), while MTMM-113-03 variants are longer (0.302" / 7.67mm). Selection depends on PCB thickness and mating connector depth requirements.

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