Amphenol ICC 51730-121 Backplane Connector - Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 51730-121 is a 29-position backplane connector header featuring male pins and blades in a right-angle configuration for through-hole PCB mounting. This connector is part of the PwrBlade® series and combines 24 signal contacts with 5 power contacts in a 4-row blade power design with 0.100" (2.54mm) pitch spacing.

The 51730-121 carries an obsolete product status, making identification of suitable alternatives essential for ongoing system support and new production requirements. The substitute part 51730-121LF provides functional equivalence while offering active product status and improved compliance characteristics.

Key Parameters

Parameter	Value
Number of Positions	29
Connector Type	Header, Male Pins and Blades
Connector Style	Blade Power
Pitch	0.100" (2.54mm)
Number of Rows	4
Contact Layout	24 Signal, 5 Power
Mounting Type	Through Hole, Right Angle
Termination	Solder
Contact Finish	Gold or Gold, GXT™
Contact Finish Thickness	30.0µin (0.76µm)
Color	Black
Material Flammability Rating	UL94 V-0
Operating Temperature Range	-20°C ~ 105°C
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 51730-121 is determined by strict equivalence across the following critical parameters:

Position Count & Layout: 29 positions with identical 24 signal and 5 power contact configuration
Physical Dimensions: 0.100" (2.54mm) pitch, 4-row arrangement, right-angle through-hole mounting
Connector Architecture: Male pins and blades in blade power style with mating guide feature
Electrical Properties: Gold contact finish at 30.0µin thickness, UL94 V-0 flammability rating
Environmental Specifications: -20°C to 105°C operating range, MSL 1 rating

The substitute part 51730-121LF maintains complete electrical and mechanical compatibility with the original 51730-121 while differing only in product lifecycle status and regulatory compliance posture.

Parameter Comparison

Parameter	51730-121 (Original)	51730-121LF (Substitute)
Manufacturer	Amphenol ICC (FCI)	Amphenol ICC (FCI)
Series	PwrBlade®	PwrBlade®
Number of Positions	29	29
Connector Type	Header, Male Pins and Blades	Header, Male Pins and Blades
Connector Style	Blade Power	Blade Power
Pitch	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	4	4
Contact Layout	24 Signal, 5 Power	24 Signal, 5 Power
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle
Termination	Solder	Solder
Contact Finish	Gold or Gold, GXT™	Gold or Gold, GXT™
Contact Finish Thickness	30.0µin (0.76µm)	30.0µin (0.76µm)
Color	Black	Black
Material Flammability Rating	UL94 V-0	UL94 V-0
Operating Temperature Range	-20°C ~ 105°C	-20°C ~ 105°C
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active
RoHS Status	Non-compliant	Compliant
REACH Status	Not specified	Affected
Packaging	Not specified	Tray

Engineering Selection Recommendations

The 51730-121LF is the direct functional equivalent of the 51730-121 for all electrical and mechanical applications. Selection between these parts should be based on the following criteria:

Use 51730-121LF for new designs and production due to its active product status, RoHS compliance, and REACH compliance designation. This part ensures long-term supply chain viability and regulatory alignment with current environmental standards.

The 51730-121 remains suitable for legacy system maintenance where existing inventory is available and regulatory compliance requirements do not mandate RoHS or REACH adherence. However, procurement of new stock should transition to the 51730-121LF variant.

Both parts share identical electrical performance, mechanical fit, and thermal characteristics, ensuring direct interchangeability at the PCB assembly level.

Frequently Asked Questions (FAQ)

Q: Are the 51730-121 and 51730-121LF mechanically interchangeable?

A: Yes. Both parts feature identical 29-position blade power connector geometry, 0.100" pitch spacing, 4-row configuration, and right-angle through-hole mounting. PCB footprints and mating interfaces are identical.

Q: What is the significance of the "LF" suffix in the 51730-121LF part number?

A: The "LF" designation indicates lead-free construction and RoHS compliance. The 51730-121LF meets current environmental regulations, whereas the original 51730-121 does not.

Q: Can I use the 51730-121LF as a direct replacement in existing assemblies designed for the 51730-121?

A: Yes. The 51730-121LF provides complete functional and mechanical compatibility. No PCB redesign or assembly process modification is required.

Q: Why is the 51730-121 listed as obsolete?

A: The original part has been superseded by the RoHS-compliant 51730-121LF variant. Amphenol ICC has transitioned production to the lead-free equivalent to meet regulatory requirements and market demand.

Q: Are there any electrical performance differences between these parts?

A: No. Both parts maintain identical contact finish specifications (Gold or Gold, GXT™ at 30.0µin thickness), operating temperature range (-20°C to 105°C), and UL94 V-0 flammability rating. Electrical performance is equivalent.

Q: What packaging is available for the 51730-121LF?

A: The 51730-121LF is supplied in tray packaging. Confirm packaging requirements with your supplier for specific order quantities.

Q: Are both parts subject to moisture sensitivity considerations?

A: Both parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. Standard handling and storage practices apply.

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