Equivalent & Substitute Parts for A3C-18P-2DSA

Part Overview

The A3C-18P-2DSA is a rectangular connector header manufactured by Hirose Electric Co Ltd, designed for through-hole mounting with 18 positions at 0.079" (2.00mm) pitch. This connector operates across a temperature range of -55°C to 85°C with a current rating of 1A and voltage rating of 200V. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	A3C-18P-2DSA
Manufacturer	Hirose Electric Co Ltd
Category	Rectangular Connectors
Connector Type	Header
Contact Type	Male Pin
Number of Positions	18
Number of Rows	2
Pitch - Mating	0.079" (2.00mm)
Row Spacing - Mating	0.079" (2.00mm)
Mounting Type	Through Hole
Termination	Solder
Fastening Type	Push-Pull
Contact Shape	Square
Contact Finish - Mating	Gold
Contact Material	Brass
Insulation Material	Polyamide (PA), Nylon
Operating Temperature	-55°C ~ 85°C
Material Flammability Rating	UL94 V-0
Current Rating	1A
Voltage Rating	200V
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the A3C-18P-2DSA is determined by strict alignment of the following critical parameters:

Number of positions: 18
Number of rows: 2
Pitch - mating: 0.079" (2.00mm)
Row spacing - mating: 0.079" (2.00mm)
Connector type: Header
Contact type: Male Pin
Mounting type: Through Hole
Termination: Solder
Fastening type: Push-Pull
Contact shape: Square
Contact finish - mating: Gold
Insulation material: Polyamide (PA), Nylon or Liquid Crystal Polymer (LCP)
Material flammability rating: UL94 V-0

The A3C-18P-2DSA(30) is a direct equivalent from Hirose Electric Co Ltd, differing only in packaging (bulk) and product status (active). The Samtec MTMM-109 series substitutes meet all critical dimensional and electrical parameters while offering enhanced operating temperature range (-55°C to 125°C) and higher current rating (3A). Contact length variations within the MTMM-109 series accommodate different application requirements while maintaining full compatibility with the mating interface.

Parameter Comparison

Parameter	A3C-18P-2DSA	A3C-18P-2DSA(30)	MTMM-109-02-F-D-127	MTMM-109-02-F-D-130	MTMM-109-02-S-D-132	MTMM-109-03-S-D-125	MTMM-109-03-S-D-130	MTMM-109-03-S-D-138	MTMM-109-03-S-D-140-001	MTMM-109-03-S-D-153	MTMM-109-03-SM-D-140
Manufacturer	Hirose	Hirose	Samtec	Samtec	Samtec	Samtec	Samtec	Samtec	Samtec	Samtec	Samtec
Number of Positions	18	18	18	18	18	18	18	18	18	18	18
Number of Rows	2	2	2	2	2	2	2	2	2	2	2
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)
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
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	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	-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 ~ 125°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	1A	3A	3A	3A	3A	3A	3A	3A	3A	3A
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
Contact Length - Mating	0.138" (4.60mm)	0.138" (4.60mm)	0.127" (3.23mm)	0.130" (3.30mm)	0.132" (3.35mm)	0.125" (3.18mm)	0.130" (3.30mm)	0.138" (4.60mm)	0.140" (4.66mm)	0.153" (3.89mm)	0.140" (4.66mm)
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)
Number of Positions Loaded	All	All	All	All	All	All	All	All	17	All	All

Engineering Selection Recommendations

The A3C-18P-2DSA(30) is the primary direct equivalent, maintaining identical electrical and mechanical specifications while offering active product status and RoHS compliance. This part is recommended for applications requiring exact form-fit-function replacement with current manufacturing support.

The Samtec MTMM-109 series provides functional substitution across all critical mating interface parameters. These parts offer extended operating temperature range to 125°C and increased current capacity to 3A, supporting broader application requirements. All MTMM-109 variants maintain UL94 V-0 flammability rating and ROHS3 compliance. Contact length variations (0.127" to 0.153" mating length) accommodate different PCB stack-up requirements while preserving push-pull fastening and 2.00mm pitch compatibility.

Selection between MTMM-109 variants depends on specific contact length requirements. MTMM-109-03-S-D-140-001 differs by loading 17 of 18 positions and should be selected only when this configuration matches application requirements.

Frequently Asked Questions (FAQ)

Q: Can MTMM-109 series connectors directly replace A3C-18P-2DSA in existing designs?

A: Yes. The MTMM-109 series maintains identical mating pitch (0.079" / 2.00mm), row spacing, contact type (male pin), and fastening mechanism (push-pull). The mating interface is fully compatible. Contact length variations require PCB footprint verification to ensure proper engagement depth.

Q: What is the difference between A3C-18P-2DSA and A3C-18P-2DSA(30)?

A: Both parts are functionally identical with 18 positions, 2.00mm pitch, and identical electrical ratings. The primary difference is packaging: A3C-18P-2DSA(30) is supplied in bulk packaging and carries active product status with RoHS compliance, while the original A3C-18P-2DSA is obsolete.

Q: Why do MTMM-109 variants have different contact lengths?

A: Contact length variations (0.127" to 0.153" mating length) accommodate different PCB thicknesses and stack-up configurations. Selection is based on the specific engagement depth required for your application. All variants maintain identical pitch and row spacing.

**Q: Are there compliance differences between substitute

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