Equivalent & Substitute Parts for A3C-4P-2DSA

Part Overview

The A3C-4P-2DSA is a rectangular connector header manufactured by Hirose Electric Co Ltd, designed for through-hole mounting with 4 positions at 2.00mm pitch. This connector operates at 1A current rating and 200V voltage rating across a temperature range of -55°C to 85°C. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain compatibility across pitch, position count, mounting type, and electrical ratings while accommodating variations in contact geometry and material specifications.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Pitch - Mating	0.079" (2.00mm)
Number of Positions	4
Number of Rows	2
Mounting Type	Through Hole
Termination	Solder
Current Rating	1A
Voltage Rating	200V
Operating Temperature	-55°C to 85°C
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution eligibility for the A3C-4P-2DSA is determined by strict adherence to the following parameters:

Critical Parameters (Must Match):

Pitch - Mating: 0.079" (2.00mm)
Number of Positions: 4
Number of Rows: 2
Connector Type: Header
Contact Type: Male Pin
Mounting Type: Through Hole
Termination: Solder
Fastening Type: Push-Pull
Style: Board to Board or Cable
Shrouding: Unshrouded

Allowable Variations:

Contact Length - Mating: Variations within 0.110" to 0.140" (2.79mm to 4.66mm)
Contact Length - Post: Variations within 0.056" to 0.086" (1.42mm to 2.18mm)
Insulation Height: Variations within 0.059" to 0.173" (1.50mm to 4.40mm)
Contact Material: Brass or Phosphor Bronze
Insulation Material: Polyamide (PA), Nylon, or Liquid Crystal Polymer (LCP)
Contact Finish - Mating: Gold or Tin
Contact Finish - Post: Gold or Tin
Current Rating: 1A or higher (3A acceptable)
Operating Temperature: Range must encompass -55°C minimum; upper limit may extend beyond 85°C
Number of Positions Loaded: All or partial loading (3 or 4 positions)

Substitute parts meeting these criteria maintain functional and mechanical compatibility with the A3C-4P-2DSA in board-to-board and cable connection applications.

Parameter Comparison

Parameter	A3C-4P-2DSA	A3C-4P-2DSA(30)	MTMM-102-02-F-D-140	MTMM-102-02-G-D-125	MTMM-102-02-G-D-126	MTMM-102-02-G-D-130	MTMM-102-02-G-D-140-001	MTMM-102-02-L-D-125	MTMM-102-02-S-D-116	MTMM-102-02-SM-D-110	MTMM-102-02-T-D-125
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.
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
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	4	4	4	4	4	4	4	4	4	4	4
Number of Rows	2	2	2	2	2	2	2	2	2	2	2
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 Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Contact Length - Mating	0.138" (4.60mm)	0.138" (4.60mm)	0.140" (4.66mm)	0.125" (3.18mm)	0.126" (3.20mm)	0.130" (3.30mm)	0.140" (4.66mm)	0.125" (3.18mm)	0.116" (2.95mm)	0.110" (2.79mm)	0.125" (3.18mm)
Contact Length - Post	0.102" (2.60mm)	0.102" (2.60mm)	0.056" (1.42mm)	0.071" (1.80mm)	0.070" (1.78mm)	0.066" (1.68mm)	0.056" (1.42mm)	0.071" (1.80mm)	0.080" (2.03mm)	0.086" (2.18mm)	0.071" (1.80mm)
Insulation Height	0.035" (0.90mm)	0.173" (4.40mm)	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	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)
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Tin
Contact Finish - Post	Gold	Gold	Tin	Gold	Gold	Gold	Gold	Tin	Tin	Tin	Tin
Current Rating	1A	1A	3A	3A	3A	3A	3A	3A	3A	3A	3A
Operating Temperature	-55°C to 85°C	-55°C to 85°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 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
RoHS Status	Not specified	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
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)

Engineering Selection Recommendations

Direct Replacement (Same Manufacturer): A3C-4P-2DSA(30) is the active equivalent from Hirose Electric Co Ltd. This part maintains identical electrical and mechanical specifications to the obsolete A3C-4P-2DSA while offering active product status and RoHS compliance. This option is preferred for designs requiring minimal qualification effort.

Cross-Manufacturer Substitutes (Samtec MTMM Series): The Samtec MTMM-102 series provides functional equivalents with enhanced specifications. All listed MTMM variants are active products with ROHS3 compliance. These parts feature improved current ratings (3A versus 1A), extended operating temperature ranges (-55°C to 105°C or 125°C), and phosphor bronze contacts with superior durability compared to brass. Contact geometry variations (mating length and post length) accommodate different PCB stack-up requirements while maintaining 2.00mm pitch and 4-position configuration.

Selection Criteria by Application:

For legacy board designs with tight mechanical constraints, A3C-4P-2DSA(30) provides direct compatibility.
For new designs or redesigns, Samtec MTMM-102 variants offer superior reliability, compliance certifications, and extended thermal performance.
Contact finish selection (gold versus tin) depends on soldering process compatibility and environmental exposure requirements.
Cuttable connector variants (MTMM series) provide design flexibility for custom position configurations.

Frequently Asked Questions (FAQ)

Q: Can MTMM-102 series connectors replace A3C-4P-2DSA in existing designs? A: Yes, provided the PCB footprint accommodates the contact geometry variations. The MTMM series maintains 2.00mm pitch and 4-position configuration. Verify contact length specifications (mating and post) against your PCB stack-up and mating connector depth requirements.

Q: What is the difference between gold and tin contact finishes? A: Gold-finished contacts (MTMM-102-02-G-D variants) provide superior corrosion resistance and are preferred for high-reliability applications. Tin-finished contacts (MTMM-102-02-T-D-125) are suitable for standard industrial applications and offer cost advantages. Both finishes are compatible with standard solder reflow processes.

Q: Are the Samtec MTMM-102 connectors fully compatible with the original Hirose A3C-4P-2DSA? A: Electrical and functional compatibility is confirmed across all critical parameters: 2.00mm pitch, 4-position, 2-row configuration, through-hole mounting, and solder termination. Mechanical compatibility depends on contact length specifications and PCB design. Verify mating connector depth and contact engagement length for your specific application.

Q: What does "cuttable" mean in the MTMM connector designation? A: Cuttable connectors allow removal of individual positions from the header strip, enabling custom configurations. This feature does not affect compatibility with standard 4-position applications.

Q: Why do substitute parts have higher current ratings (3A versus 1A)? A: The Samtec MTMM-102 series is designed for higher current applications. The 3A rating represents the connector's maximum capability and does not require circuit modification. Existing 1A designs operate safely within this rating.

Q: Is RoHS compliance required for my application? A: RoHS compliance is mandatory for products sold in the European Union and many other markets. A3C-4P-2DSA(30) and all Samtec MTMM-102 variants meet RoHS requirements. Verify compliance requirements for your target markets.

Q: What is the difference between A3C-4P-2DSA and A3C-4P-2DSA(30)? A: A3C-4P-2DSA(30) is the active production variant with identical specifications. The suffix "(30)" indicates packaging configuration (bulk). Both parts are electrically and mechanically equivalent.

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