Molex 0423752521 Equivalent & Substitute Parts

Part Overview

The Molex 0423752521 is a vertical header connector with 2 positions at 2.54mm pitch, designed for through-hole board-to-board applications. This unshrouded, single-row connector features male pins with gold-plated mating contacts and tin-plated posts, suitable for general purpose, automotive, medical, and telecommunications applications. The part is currently active in production with 813 units in stock.

Substitute parts are necessary when the original Molex KK254 series becomes unavailable, when alternative packaging formats are required, or when design specifications allow for compatible contact finishes and post lengths within the established electrical and mechanical parameters.

Key Parameters

Parameter	Value
Manufacturer Part Number	0423752521
Manufacturer	Molex
Series	KK254, 42375
Connector Type	Header, Breakaway
Contact Type	Male Pin
Pitch - Mating	0.100" (2.54mm)
Number of Positions	2
Number of Rows	1
Mounting Type	Through Hole
Termination	Solder
Fastening Type	Push-Pull
Contact Finish - Mating	Gold
Contact Finish - Post	Tin
Insulation Material	Polyamide (PA), Nylon, Glass Filled
Material Flammability Rating	UL94 V-0
Insulation Color	Black
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the Molex 0423752521 are qualified based on the following critical parameters that must remain constant:

Pitch - Mating: 0.100" (2.54mm)
Number of Positions: 2
Number of Rows: 1
Connector Type: Header
Contact Type: Male Pin
Mounting Type: Through Hole
Termination: Solder
Fastening Type: Push-Pull
Contact Shape: Square
Insulation Color: Black
Material Flammability Rating: UL94 V-0
Moisture Sensitivity Level: 1 (Unlimited)

Acceptable variations within substitute parts include:

Contact Finish - Mating: Gold or Tin (different finish options)
Contact Finish Thickness - Mating: 30.0µin (0.76µm) or 15.0µin (0.38µm)
Contact Length - Post: 0.095" (2.41mm), 0.120" (3.05mm), or 0.150" (3.81mm)
Overall Contact Length: 0.425" (10.80mm), 0.450" (11.43mm), or 0.480" (12.19mm)
Insulation Height: 0.090" (2.29mm) or 0.100" (2.54mm)
Insulation Material: Polyamide (PA) or Polycyclohexylenedimethylene Terephthalate (PCT), Glass Filled
Operating Temperature Range: -65°C ~ 125°C or -65°C ~ 130°C
Packaging: Bulk or Bag
RoHS Status: ROHS3 Compliant or RoHS Compliant
Product Status: Active or Obsolete

Parameter Comparison

Part Number	Manufacturer	Series	Pitch (mm)	Positions	Contact Finish - Mating	Contact Length - Post (mm)	Overall Contact Length (mm)	Insulation Height (mm)	Operating Temp (°C)	Current Rating	RoHS Status	Product Status	Packaging
0423752521	Molex	KK254, 42375	2.54	2	Gold	3.89	12.07	2.29	-	-	ROHS3 Compliant	Active	Bulk
68000-102HLF	Amphenol ICC (FCI)	BERGSTIK® II	2.54	2	Gold or Gold, GXT™	2.41	10.80	2.54	-65 ~ 125	3A per Contact	RoHS Compliant	Active	Bag
68000-202HLF	Amphenol ICC (FCI)	BERGSTIK® II	2.54	2	Gold or Gold, GXT™	2.41	10.80	2.54	-65 ~ 125	3A per Contact	RoHS Compliant	Active	Bag
68000-402	Amphenol ICC (FCI)	BERGSTIK® II	2.54	2	Tin	2.41	10.80	2.54	-65 ~ 125	3A per Contact	RoHS non-compliant	Obsolete	Bulk
68000-402HLF	Amphenol ICC (FCI)	BERGSTIK® II	2.54	2	Tin	2.41	10.80	2.54	-65 ~ 125	3A per Contact	RoHS Compliant	Active	Bag
68001-102HLF	Amphenol ICC (FCI)	BERGSTIK® II	2.54	2	Gold or Gold, GXT™	3.05	11.43	2.54	-65 ~ 125	3A per Contact	RoHS Compliant	Active	Bag
68001-202HLF	Amphenol ICC (FCI)	BERGSTIK® II	2.54	2	Gold or Gold, GXT™	3.05	11.43	2.54	-65 ~ 125	3A per Contact	RoHS Compliant	Active	Bag
68001-402HLF	Amphenol ICC (FCI)	BERGSTIK® II	2.54	2	Tin	3.05	11.43	2.54	-65 ~ 125	3A per Contact	RoHS Compliant	Active	Bag
68002-402HLF	Amphenol ICC (FCI)	BERGSTIK® II	2.54	2	Tin	3.81	12.19	2.54	-65 ~ 130	3A	RoHS Compliant	Active	Bulk
69190-202HLF	Amphenol ICC (FCI)	BERGSTIK® II	2.54	2	Gold or Gold, GXT™	3.05	11.43	2.54	-65 ~ 130	3A	RoHS Compliant	Active	Bulk
69190-402	Amphenol ICC (FCI)	BERGSTIK® II	2.54	2	Tin	3.05	11.43	2.54	-65 ~ 130	3A	RoHS Compliant	Obsolete	Bag

Engineering Selection Recommendations

Primary Substitutes (Active Status, RoHS Compliant):

68001-102HLF and 68001-202HLF are the most direct active substitutes. Both feature gold-plated mating contacts matching the original Molex part, RoHS compliance, and identical pitch and position specifications. The primary difference is contact finish thickness (30.0µin vs. 15.0µin), which does not affect functional compatibility. Post length is 3.05mm compared to the original 3.89mm, requiring PCB layout verification.

68000-102HLF and 68000-202HLF offer gold-plated alternatives with shorter post length (2.41mm) and are suitable when PCB thickness accommodates reduced post engagement.

Tin-Plated Alternatives (Active Status, RoHS Compliant):

68000-402HLF and 68001-402HLF provide tin-plated mating contact finishes with RoHS compliance. These are functionally equivalent to gold-plated variants but with different contact finish specifications. Post lengths are 2.41mm and 3.05mm respectively.

68002-402HLF offers the longest post length (3.81mm) with tin plating and extended operating temperature range (-65°C ~ 130°C), suitable for applications requiring deeper PCB penetration.

Extended Temperature Range:

69190-202HLF and 69190-402 support -65°C ~ 130°C operating range compared to -65°C ~ 125°C for other substitutes. 69190-202HLF is active and RoHS compliant with gold plating. 69190-402 is obsolete and should not be selected for new designs.

Obsolete Parts (Not Recommended for New Designs):

68000-402 and 69190-402 carry obsolete status and should not be used for new production designs despite available inventory.

Frequently Asked Questions (FAQ)

Q: Can I substitute the Molex 0423752521 with any Amphenol ICC BERGSTIK® II connector?

A: Only Amphenol ICC BERGSTIK® II connectors with identical pitch (2.54mm), position count (2), row configuration (1), and contact type (male pin) are functionally equivalent. Contact finish (gold or tin) and post length variations are acceptable provided PCB layout accommodates the specific post length.

Q: What is the difference between gold and tin contact finishes?

A: Gold-plated contacts (68000-102HLF, 68001-102HLF, 69190-202HLF) provide superior corrosion resistance and lower contact resistance. Tin-plated contacts (68000-402HLF, 68001-402HLF, 68002-402HLF) are cost-effective alternatives suitable for non-corrosive environments. Both finishes are electrically compatible with standard mating connectors.

Q: How do post length variations affect compatibility?

A: Post length determines PCB penetration depth. The original Molex part has 3.89mm posts. Amphenol substitutes range from 2.41mm to 3.81mm. Shorter posts (2.41mm) require thinner PCBs or surface-mount considerations. Longer posts (3.81mm) provide deeper engagement for thicker PCBs. PCB thickness and hole depth must be verified against selected post length.

Q: Are all substitute parts RoHS compliant?

A: Most active substitutes are RoHS compliant. 68000-402 is RoHS non-compliant and obsolete. For applications requiring RoHS compliance, select from active parts marked "RoHS Compliant" in the parameter comparison table.

Q: What is the difference between Bulk and Bag packaging?

A: Bulk packaging contains loose connectors without individual packaging. Bag packaging provides individual or small-quantity packaging. Functional performance is identical; packaging choice depends on inventory management and handling requirements.

Q: Can I use obsolete parts as substitutes?

A: Obsolete parts (68000-402, 69190-402) should not be selected for new designs. While inventory may be available, obsolete status indicates discontinued production and potential supply chain risk. Active alternatives should be prioritized.

Q: What operating temperature range should I select?

A: The original Molex part does not specify operating temperature. Most Amphenol substitutes support -65°C ~ 125°C. For extended temperature applications, 68002-402HLF and 69190-202HLF support -65°C ~ 130°C. Verify application requirements before selection.

Q: Are contact finish thickness variations significant?

A: Contact finish thickness (15.0µin vs. 30.0µin for gold; 100.0µin for tin) affects contact durability and wear resistance. Thicker finishes provide longer service life in high-cycle mating applications. For standard applications, both thicknesses are functionally equivalent.

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