Amphenol ICC 51939-331 Backplane Connector - Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 51939-331 is a 30-position blade power connector header designed for board edge, through-hole, right-angle mounting applications. This connector features male pins and blades with a 0.100" (2.54mm) pitch, configured with 24 signal contacts and 6 power contacts across 4 rows. The part is classified as obsolete, making identification of active equivalent components essential for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Connector Type	Header, Male Pins and Blades
Connector Style	Blade Power
Number of Positions	30
Number of Positions Loaded	17
Pitch	0.100" (2.54mm)
Number of Rows	4
Mounting Type	Board Edge, Through Hole, Right Angle
Termination	Solder
Contact Layout	24 Signal, 6 Power
Features	Board Lock, Mating Guide
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
Series	PwrBlade®
Base Product Number	51939

Substitute Part Grouping Explanation

Substitution of the 51939-331 is determined by strict equivalence across the following critical parameters:

Connector Type and Style: Header with male pins and blades, blade power configuration
Electrical Configuration: 30 total positions with 17 loaded, 24 signal and 6 power contact layout
Physical Dimensions: 0.100" (2.54mm) pitch, 4-row configuration
Mounting Specification: Board edge, through-hole, right-angle orientation
Contact Properties: Gold or Gold GXT™ finish at 30.0µin thickness
Environmental Ratings: UL94 V-0 flammability, -20°C to 105°C operating range
Series Compatibility: PwrBlade® series designation

The substitute part 51939-331LF maintains identical electrical and mechanical specifications while differing in product status (active versus obsolete) and RoHS compliance status.

Parameter Comparison

Parameter	51939-331 (Main Part)	51939-331LF (Substitute)
Manufacturer	Amphenol ICC (FCI)	Amphenol ICC (FCI)
Category	Backplane Connectors	Backplane Connectors
Connector Type	Header, Male Pins and Blades	Header, Male Pins and Blades
Connector Style	Blade Power	Blade Power
Number of Positions	30	30
Number of Positions Loaded	17	17
Pitch	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	4	4
Mounting Type	Board Edge, Through Hole, Right Angle	Board Edge, Through Hole, Right Angle
Termination	Solder	Solder
Contact Layout	24 Signal, 6 Power	24 Signal, 6 Power
Features	Board Lock, Mating Guide	Board Lock, Mating Guide
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
Series	PwrBlade®	PwrBlade®
Base Product Number	51939	51939
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99
HTSUS	8536.69.4040	8536.69.4040

Engineering Selection Recommendations

The 51939-331LF is the direct functional equivalent of the 51939-331. Both parts share identical electrical and mechanical specifications within the PwrBlade® series. The primary distinction is product lifecycle status: the 51939-331 is obsolete while the 51939-331LF is active.

For new designs and ongoing production, the 51939-331LF is the appropriate selection. This part maintains full compatibility with existing board designs while offering the advantage of active product status and RoHS compliance. The RoHS compliant designation of the 51939-331LF aligns with current regulatory requirements for electronic components in regulated markets.

Both parts carry identical environmental certifications (UL94 V-0), moisture sensitivity ratings (MSL 1), and export classifications (EAR99), ensuring equivalent performance in specified operating conditions.

Frequently Asked Questions (FAQ)

Q: Are the 51939-331 and 51939-331LF mechanically interchangeable?

A: Yes. Both parts are identical in physical dimensions, mounting configuration, and contact layout. The 51939-331LF can be used as a direct replacement in any application originally designed for the 51939-331.

Q: What is the difference between these two part numbers?

A: The 51939-331LF is the active production equivalent of the obsolete 51939-331. The "LF" suffix indicates RoHS compliance. All electrical and mechanical specifications are identical.

Q: Can the 51939-331 be used in new designs?

A: The 51939-331 is classified as obsolete. For new designs, the 51939-331LF is the recommended selection to ensure long-term component availability and compliance with current regulatory standards.

Q: What does the packaging difference mean?

A: The 51939-331 is supplied without specified packaging, while the 51939-331LF is supplied in Tray packaging. This affects handling and storage but does not impact electrical or mechanical performance.

Q: Are there any performance differences between these parts?

A: No. Both parts operate identically across all specified parameters including contact finish, operating temperature range, flammability rating, and moisture sensitivity level.

Q: What is the pitch specification and why does it matter?

A: Both parts use a 0.100" (2.54mm) pitch, which defines the center-to-center spacing between contacts. This specification is critical for PCB layout and mating connector compatibility.

Q: How many signal and power contacts are in this connector?

A: The connector has 30 total positions with 17 positions loaded: 24 signal contacts and 6 power contacts distributed across 4 rows.

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