Equivalent & Substitute Parts for A3C-20P-2DSA Rectangular Connector

Part Overview

The A3C-20P-2DSA is a through-hole rectangular connector header manufactured by Hirose Electric Co Ltd, featuring 20 positions arranged in 2 rows with 2.00mm pitch. This connector is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design and procurement requirements. The part operates within -55°C to 85°C temperature range with 1A current rating per contact and 200V voltage rating. Equivalent parts must maintain electrical and mechanical compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Pitch - Mating	0.079" (2.00mm)
Number of Positions	20
Number of Rows	2
Row Spacing - Mating	0.079" (2.00mm)
Mounting Type	Through Hole
Termination	Solder
Contact Finish - Mating	Gold
Contact Material	Brass or Phosphor Bronze
Insulation Material	Polyamide (PA), Nylon or Liquid Crystal Polymer (LCP)
Operating Temperature Range	-55°C to 85°C (minimum)
Current Rating	1A per contact (minimum)
Material Flammability Rating	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the A3C-20P-2DSA is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Pitch - Mating: 0.079" (2.00mm)
Number of Positions: 20
Number of Rows: 2
Row Spacing - Mating: 0.079" (2.00mm)
Contact Type: Male Pin
Mounting Type: Through Hole
Termination: Solder
Contact Finish - Mating: Gold
Material Flammability Rating: UL94 V-0
Moisture Sensitivity Level: 1 (Unlimited)

Allowable Variations:

Contact Material: Brass (original) or Phosphor Bronze (substitute)
Insulation Material: Polyamide/Nylon (original) or Liquid Crystal Polymer (substitute)
Operating Temperature Range: May exceed original -55°C to 85°C specification
Current Rating: May exceed original 1A specification
Contact Length - Mating: Minor variations acceptable within mechanical envelope constraints
Contact Length - Post: Variations acceptable based on application requirements
Overall Contact Length: Variations acceptable within board-to-board spacing requirements
Insulation Height: Variations acceptable within mechanical constraints

All substitute parts listed maintain compatibility with the original A3C-20P-2DSA through-hole footprint and electrical interface requirements.

Parameter Comparison

Parameter	A3C-20P-2DSA	A3C-20P-2DSA(30)	M22-2521005	MTMM-110-02-F-D-126	MTMM-110-02-F-D-128	MTMM-110-02-F-D-130	MTMM-110-02-F-D-131	MTMM-110-02-G-D-110	MTMM-110-02-G-D-124	MTMM-110-02-G-D-135	MTMM-110-02-G-D-150
Manufacturer	Hirose	Hirose	Harwin	Samtec	Samtec	Samtec	Samtec	Samtec	Samtec	Samtec	Samtec
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
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	20	20	20	20	20	20	20	20	20	20	20
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 Finish - Mating	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	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	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)
Operating Temperature Range	-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 ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Current Rating	1A	1A	1A per Contact	3A	3A	3A	3A	3A	3A	3A	3A
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)
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

Direct Hirose Equivalent: A3C-20P-2DSA(30) is the active production equivalent from Hirose Electric Co Ltd. This part maintains identical electrical and mechanical specifications to the obsolete A3C-20P-2DSA while offering active product status and RoHS compliance. Selection of this part eliminates supply chain risk associated with obsolete components.

Harwin Alternative: M22-2521005 provides cross-manufacturer compatibility with extended operating temperature range (-40°C to 105°C) and cuttable connector functionality. This part is suitable for applications requiring higher temperature performance while maintaining 1A current rating and identical pitch/position configuration.

Samtec Alternatives: The MTMM-110 series from Samtec offers multiple contact length options (designated by suffix codes -126 through -150) to accommodate varying board-to-board spacing requirements. All MTMM variants feature enhanced current rating (3A), extended temperature range (-55°C to 125°C), and ROHS3 compliance. Two contact finish configurations are available:

MTMM-110-02-F-D variants: Tin finish on post contacts
MTMM-110-02-G-D variants: Gold finish on both mating and post contacts

Selection among MTMM variants depends on specific board-to-board spacing and contact length requirements. The cuttable connector feature enables custom position configurations when full 20-position headers are not required.

Frequently Asked Questions (FAQ)

Q: Can A3C-20P-2DSA be directly replaced with A3C-20P-2DSA(30)? A: Yes. A3C-20P-2DSA(30) is the active production equivalent with identical electrical and mechanical specifications. The primary difference is product status (active vs. obsolete) and RoHS compliance certification.

Q: What are the key differences between Hirose and Samtec alternatives? A: Hirose A3C-20P-2DSA(30) maintains original specifications including 1A current rating and Polyamide insulation material. Samtec MTMM-110 series provides enhanced current rating (3A), extended temperature range (-55°C to 125°C), Liquid Crystal Polymer insulation, and cuttable connector functionality. Both maintain identical pitch, position count, and through-hole mounting compatibility.

Q: How do contact length variations in MTMM-110 series affect compatibility? A: Contact length variations (designated by suffix codes -126 through -150) accommodate different board-to-board spacing requirements. Selection must be based on specific application mating height requirements. All variants maintain identical pitch and position configuration, ensuring footprint compatibility.

Q: Are Samtec MTMM-110 parts backward compatible with A3C-20P-2DSA applications? A: MTMM-110 series maintains electrical and mechanical compatibility through identical pitch (2.00mm), position count (20), row configuration (2 rows), and through-hole solder termination. Enhanced specifications (3A current rating, -55°C to 125°C temperature range) provide performance margin for existing applications.

Q: What is the significance of contact finish options in MTMM-110 series? A: MTMM-110-02-F-D variants feature tin finish on post contacts, suitable for standard solder applications. MTMM-110-02-G-D variants feature gold finish on both mating and post contacts, providing enhanced corrosion resistance and contact reliability in demanding environments.

Q: Does Harwin M22-2521005 offer advantages over other alternatives? A: M22-2521005 provides extended operating temperature range (-40°C to 105°C) compared to original specification (-55°C to 85°C), making it suitable for higher temperature applications. Cuttable connector design enables custom position configurations. Current rating remains at 1A per contact, matching original specification.

Q: Are all substitute parts RoHS compliant? A: A3C-20P-2DSA(30), M22-2521005, and all MTMM-110 variants are RoHS compliant (RoHS or ROHS3 certified). The original A3C-20P-2DSA does not specify RoHS status.

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