DF13-20DS-1.25DSA(55) Equivalent & Substitute Parts

Part Overview

The DF13-20DS-1.25DSA(55) is a 20-position receptacle connector manufactured by Hirose Electric Co Ltd, designed for board-to-board or cable applications with 0.049" (1.25mm) pitch spacing. This connector features through-hole solder termination, friction lock fastening, and gold-plated mating contacts rated for 1A at 150VAC. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Number of Positions	20
Pitch - Mating	0.049" (1.25mm)
Number of Rows	2
Contact Type	Female Socket
Mounting Type	Through Hole
Termination	Solder
Contact Finish - Mating	Gold
Current Rating	1A
Voltage Rating	150VAC
Operating Temperature	-35°C ~ 85°C
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

The substitute part 20021311-00020T4LF (Amphenol ICC/FCI Minitek127® 1.27mm series) is identified as a functional alternative based on the following critical parameters:

Matching Parameters:

Connector type: Receptacle
Number of positions: 20
Number of rows: 2
Contact type: Female socket
Mounting type: Through hole
Termination: Solder
Contact finish - mating: Gold
Material flammability rating: UL94 V-0
Contact material: Phosphor bronze

Substitution Basis: The 20021311-00020T4LF maintains electrical and mechanical compatibility through identical position count, row configuration, and contact specifications. Both connectors employ solder termination with gold-plated mating surfaces and phosphor bronze contacts. The primary difference is pitch spacing (0.050" vs 0.049"), which represents a minor geometric variation within acceptable tolerance for board-level applications. The substitute part is active in production with expanded temperature range (-40°C ~ 105°C) and RoHS compliance, providing enhanced availability and regulatory alignment.

Parameter Comparison

Parameter	DF13-20DS-1.25DSA(55)	20021311-00020T4LF
Manufacturer	Hirose Electric Co Ltd	Amphenol ICC (FCI)
Series	DF13	Minitek127® 1.27mm
Product Status	Obsolete	Active
Connector Type	Receptacle	Receptacle
Number of Positions	20	20
Pitch - Mating	0.049" (1.25mm)	0.050" (1.27mm)
Number of Rows	2	2
Contact Type	Female Socket	Female Socket
Mounting Type	Through Hole	Through Hole
Termination	Solder	Solder
Fastening Type	Friction Lock	Push-Pull
Contact Finish - Mating	Gold	Gold
Contact Finish Thickness - Mating	8.00µin (0.203µm)	10.0µin (0.25µm)
Insulation Height	0.197" (5.00mm)	0.173" (4.40mm)
Contact Length - Post	0.079" (2.00mm)	0.094" (2.40mm)
Operating Temperature	-35°C ~ 85°C	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0
Contact Material	Phosphor Bronze	Phosphor Bronze
RoHS Status	Not specified	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The 20021311-00020T4LF serves as the designated substitute for the obsolete DF13-20DS-1.25DSA(55). Selection of this alternative is supported by:

Product Status: The substitute part maintains active production status with established supply chain availability, addressing the obsolescence of the original component.

Regulatory Compliance: Both connectors meet UL94 V-0 flammability requirements. The substitute part carries RoHS compliance certification, aligning with current environmental and regulatory standards.

Electrical and Mechanical Compatibility: Identical position count, row configuration, contact type, and termination method ensure functional interchangeability in board-level applications. Both employ phosphor bronze contacts with gold plating and solder termination.

Temperature Performance: The substitute part extends the operating temperature range to -40°C ~ 105°C, providing enhanced thermal margin compared to the original -35°C ~ 85°C specification.

Geometric Considerations: The pitch difference (0.050" vs 0.049") and variations in insulation height and contact post length require PCB layout verification to confirm mechanical fit within existing mounting footprints.

Frequently Asked Questions (FAQ)

Q: Can the 20021311-00020T4LF directly replace the DF13-20DS-1.25DSA(55) without PCB modification?

A: Direct replacement requires verification of PCB mounting hole spacing and connector body dimensions. The pitch difference of 0.001" (0.02mm) and variations in insulation height (0.197" vs 0.173") necessitate confirmation that the substitute connector physically fits the existing PCB footprint.

Q: What are the key electrical differences between these connectors?

A: Both connectors share identical electrical specifications: 20 positions, female socket contacts, gold-plated mating surfaces, and solder termination. Current and voltage ratings are specified for the original part (1A, 150VAC); equivalent ratings for the substitute are not provided in available documentation.

Q: Why is the fastening type different (Friction Lock vs Push-Pull)?

A: The fastening mechanism differs between the two designs. The original uses friction lock retention, while the substitute employs push-pull fastening. This difference affects mating and unmating procedures and requires evaluation for the specific application.

Q: Is the substitute part RoHS compliant?

A: Yes, the 20021311-00020T4LF is RoHS compliant. The original part's RoHS status is not specified in available documentation.

Q: What is the impact of the extended operating temperature range?

A: The substitute part operates from -40°C to 105°C compared to the original -35°C to 85°C range. This provides additional thermal margin for applications requiring extended temperature performance.

Q: Are there packaging differences between these parts?

A: The original part packaging is not specified. The substitute part is supplied in tube packaging, which may affect handling and assembly procedures.

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