Molex 0015451321 Equivalent & Substitute Parts

Part Overview

The Molex 0015451321 is a 42-position receptacle connector with 0.100" (2.54mm) pitch, designed for through-hole PCB mounting with solder termination. This connector features tin-plated contacts, push-pull fastening, and operates across -40°C to 105°C. 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	0015451321
Manufacturer	Molex
Connector Type	Receptacle
Number of Positions	42
Pitch - Mating	0.100" (2.54mm)
Number of Rows	2
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Termination	Solder
Fastening Type	Push-Pull
Contact Finish - Mating	Tin
Operating Temperature	-40°C ~ 105°C
Current Rating	2.5A
Voltage Rating	250V
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the Molex 0015451321 is determined by the following critical parameters:

Connector Configuration: 42 positions, 2 rows, 0.100" (2.54mm) pitch and row spacing
Mounting & Termination: Through-hole solder termination with push-pull fastening
Electrical Ratings: Minimum 2.5A current and 250V voltage capability
Operating Temperature Range: Support for -40°C to 105°C minimum
Compliance: ROHS3 compliance and EAR99 classification

Substitute parts are grouped into two categories:

Category 1: Samtec ESD-121 Series (Elevated Socket Connectors) These parts maintain the 42-position, 0.100" pitch configuration with elevated socket design. Available in gold-plated (ESD-121-G variants) and tin-plated post finishes (ESD-121-T variants). Contact length variations (0.115", 0.215", 0.365") accommodate different PCB stack-up requirements.

Category 2: Sullins PPPC212LFBN-RC (Header Connector) This part provides a header connector alternative with 42 positions and 0.100" pitch, featuring gold-plated contacts and comparable electrical ratings.

Parameter Comparison

Parameter	Molex 0015451321	Samtec ESD-121-G-06	Samtec ESD-121-G-23	Samtec ESD-121-G-26	Samtec ESD-121-G-28	Samtec ESD-121-T-23	Samtec ESD-121-T-26	Samtec ESD-121-T-28	Sullins PPPC212LFBN-RC
Number of Positions	42	42	42	42	42	42	42	42	42
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	2	2	2	2	2	2	2	2	2
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	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
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Finish - Mating	Tin	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold
Operating Temperature	-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	-40°C ~ 105°C
Current Rating (Amps)	2.5A	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	3A
Voltage Rating	250V	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	250V
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Samtec ESD-121 Series Selection

The Samtec ESD-121 series provides active product status with extended operating temperature range (-55°C to 125°C) compared to the original Molex part. All variants maintain ROHS3 compliance and EAR99 classification. Selection within this series depends on contact length requirements:

ESD-121-G-06, ESD-121-G-23, ESD-121-T-23: 0.115" (2.92mm) contact length for standard PCB applications
ESD-121-G-26, ESD-121-T-26: 0.215" (5.46mm) contact length for elevated or stacked PCB configurations
ESD-121-G-28, ESD-121-T-28: 0.365" (9.27mm) contact length for extended reach applications

Gold-plated variants (ESD-121-G series) provide enhanced corrosion resistance and contact reliability. Tin-plated post variants (ESD-121-T series) offer cost optimization while maintaining mating surface gold plating.

Sullins PPPC212LFBN-RC Selection

The Sullins PPPC212LFBN-RC header connector matches the original operating temperature range (-40°C to 105°C) and provides equivalent electrical ratings (3A current, 250V voltage). This part is suitable for applications where header connector topology is acceptable and cost optimization is prioritized. ROHS3 compliance and EAR99 classification are maintained.

Frequently Asked Questions (FAQ)

Q: Can Samtec ESD-121 series connectors directly replace the Molex 0015451321?

A: Yes, within mechanical and electrical constraints. The ESD-121 series maintains the 42-position, 0.100" pitch configuration and push-pull fastening. Contact length variations must align with PCB stack-up requirements. The extended operating temperature range (-55°C to 125°C) exceeds the original specification.

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

A: Gold-plated mating surfaces (ESD-121-G variants) provide superior corrosion resistance and contact reliability in harsh environments. Tin-plated post finishes (ESD-121-T variants) reduce material cost while maintaining gold-plated mating surfaces for connector interface reliability.

Q: How do contact length variations affect PCB design?

A: Contact length determines the distance from the PCB surface to the mating interface. Shorter lengths (0.115") suit standard single-board applications. Longer lengths (0.215", 0.365") accommodate stacked PCB configurations or elevated connector mounting. PCB footprint design must account for selected contact length.

Q: Is the Sullins PPPC212LFBN-RC a socket or header connector?

A: The Sullins PPPC212LFBN-RC is a header connector with female socket contacts. This differs from the Molex 0015451321 receptacle topology. Header connectors are suitable for applications where the mating connector is a plug-type header rather than a receptacle.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and EAR99 classification, matching the regulatory status of the original Molex 0015451321.

Q: What inventory availability exists for these substitute parts?

A: Samtec ESD-121 variants range from 818 to 1167 pieces in stock. Sullins PPPC212LFBN-RC has 670 pieces available. All parts are classified as new original stock.

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