L777TSBH25POL2 D-Sub Plug Connector: Equivalent & Substitute Parts

Part Overview

The L777TSBH25POL2 is a 25-position D-Sub plug connector manufactured by Amphenol ICC (Commercial Products). This through-hole solder-terminated connector features male pins in a 2-row configuration with shell size 3 (DB, B) layout. The connector is designed for signal applications with a current rating of 5A and operates across the temperature range of -55°C to 125°C. Product status is Active with RoHS compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative sourcing reduces lead times, or when design flexibility permits selection from multiple qualified manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Criticality for Substitution
Connector Type	Plug, Male Pins	Critical
Number of Positions	25	Critical
Number of Rows	2	Critical
Shell Size, Connector Layout	3 (DB, B)	Critical
Mounting Type	Through Hole	Critical
Termination	Solder	Critical
Flange Feature	Board Side (4-40)	High
Current Rating (Amps)	5A	High
Voltage Rating	600V	High
Operating Temperature Range	-55°C ~ 125°C	High
Material Flammability Rating	UL94 V-0	High
Contact Finish	Gold	Medium
Shell Material, Finish	Steel, Tin Plated	Medium
RoHS Status	RoHS Compliant	High

Substitute Part Grouping Explanation

Substitution logic for the L777TSBH25POL2 is based on strict alignment of the following critical parameters:

Critical Alignment Requirements:

Connector type must be Plug with Male Pins
Position count must be 25
Row configuration must be 2 rows
Shell size and layout must be 3 (DB, B)
Mounting type must be Through Hole
Termination must be Solder

High-Priority Alignment Requirements:

Flange feature configuration (Board Side 4-40 preferred, but Housing/Shell or Mating Side alternatives acceptable with design verification)
Current rating must meet or exceed 5A
Voltage rating must meet or exceed 600V (or be unspecified, indicating general-purpose signal use)
Operating temperature range must encompass -55°C to 125°C or be compatible within application limits
Material flammability rating must be UL94 V-0

Medium-Priority Alignment Requirements:

Contact finish (Gold preferred for signal integrity; alternatives acceptable if application permits)
Shell material and finish (Steel with various plating options acceptable)
RoHS and REACH compliance status

The substitute parts listed below meet all critical alignment requirements. Variations in medium-priority parameters are noted to enable informed selection based on specific application constraints.

Parameter Comparison

Part Number	Manufacturer	Connector Type	Positions	Rows	Shell Size	Mounting Type	Termination	Current Rating (A)	Voltage Rating (V)	Operating Temp (°C)	Flammability	Contact Finish	RoHS Status
L777TSBH25POL2	Amphenol ICC	Plug, Male Pins	25	2	3 (DB, B)	Through Hole	Solder	5	600	-55 ~ 125	UL94 V-0	Gold	RoHS Compliant
09643227235	HARTING	Plug, Male Pins	25	2	3 (DB, B)	Through Hole	Solder	7.5	100	-20 ~ 125	UL94 V-0	Not Specified	ROHS3 Compliant
09643227240	HARTING	Plug, Male Pins	25	2	3 (DB, B)	Through Hole	Solder	7.5	100	-20 ~ 125	UL94 V-0	Not Specified	ROHS3 Compliant
09653617713	HARTING	Plug, Male Pins	25	2	3 (DB, B)	Through Hole	Solder	6.5	Not Specified	-55 ~ 125	UL94 V-0	Not Specified	ROHS3 Compliant
172-E25-113R001	NorComp Inc.	Plug, Male Pins	25	2	3 (DB, B)	Panel Mount, Through Hole	Solder	5	Not Specified	-50 ~ 100	UL94 V-0	Gold	ROHS3 Compliant
172-E25-113R021	NorComp Inc.	Plug, Male Pins	25	2	3 (DB, B)	Panel Mount, Through Hole	Solder	5	Not Specified	-50 ~ 100	UL94 V-0	Gold	ROHS3 Compliant
172-E25-113R911	NorComp Inc.	Plug, Male Pins	25	2	3 (DB, B)	Panel Mount, Through Hole	Solder	5	Not Specified	-50 ~ 100	UL94 V-0	Gold	ROHS3 Compliant
D25P24A4GX00LF	Amphenol ICC (FCI)	Plug, Male Pins	25	2	3 (DB, B)	Through Hole	Solder	5	300	-55 ~ 125	UL94 V-0	Gold	ROHS3 Compliant
D25P24A4PL00LF	Amphenol ICC (FCI)	Plug, Male Pins	25	2	3 (DB, B)	Through Hole	Solder	5	300	-55 ~ 125	UL94 V-0	Gold	RoHS Compliant
D25P24B4GV00LF	Amphenol ICC (FCI)	Plug, Male Pins	25	2	3 (DB, B)	Through Hole	Solder	5	300	-55 ~ 125	UL94 V-0	Gold	RoHS Compliant
D25P24B6GV00LF	Amphenol ICC (FCI)	Plug, Male Pins	25	2	3 (DB, B)	Through Hole	Solder	5	300	-55 ~ 125	UL94 V-0	Gold	RoHS Compliant

Engineering Selection Recommendations

Amphenol ICC (FCI) Delta D Series – Direct Electrical Equivalents:

The parts D25P24A4GX00LF, D25P24A4PL00LF, D25P24B4GV00LF, and D25P24B6GV00LF are direct electrical and mechanical equivalents to the L777TSBH25POL2. All share identical critical parameters: 25-position, 2-row, shell size 3 (DB, B), through-hole solder termination, 5A current rating, and -55°C to 125°C operating range. All carry UL94 V-0 flammability rating and gold contact finish. Voltage rating is 300V (lower than the primary part's 600V but suitable for standard signal applications). These parts are available in high inventory quantities and carry current RoHS compliance status.

HARTING Series – Functional Equivalents with Parameter Variations:

Parts 09643227235, 09643227240, and 09653617713 meet all critical connector geometry and termination requirements. These HARTING connectors feature higher current ratings (6.5A to 7.5A) and carry ROHS3 compliance. However, they present the following parameter differences:

09643227235 and 09643227240: Voltage rating of 100V (versus 600V primary); operating temperature minimum of -20°C (versus -55°C primary)
09653617713: Voltage rating not specified; operating temperature range -55°C to 125°C matches primary part

These parts are suitable for applications where the lower voltage rating and/or reduced low-temperature performance are acceptable.

NorComp Inc. 172-E Series – Panel Mount Variants:

Parts 172-E25-113R001, 172-E25-113R021, and 172-E25-113R911 provide panel mount capability in addition to through-hole mounting. All three carry 5A current rating, gold contact finish, and UL94 V-0 flammability rating with ROHS3 compliance. Operating temperature range is -50°C to 100°C (narrower than primary part). These parts are suitable for applications requiring panel-mount flexibility where the reduced temperature range is acceptable.

Compliance and Availability:

All listed substitute parts carry active product status and meet or exceed RoHS compliance requirements. Inventory availability ranges from 814 to 1584 pieces across the substitute options, providing supply security. Selection should prioritize parts matching the application's actual voltage and temperature requirements rather than selecting based on maximum rated specifications alone.

Frequently Asked Questions (FAQ)

Q1: Can I substitute a HARTING 09643227235 for the L777TSBH25POL2 in a 600V application?

A: No. The HARTING 09643227235 has a voltage rating of 100V, which is insufficient for 600V applications. The Amphenol ICC (FCI) Delta D series parts (D25P24A4GX00LF, D25P24A4PL00LF, D25P24B4GV00LF, D25P24B6GV00LF) are rated for 300V and are more appropriate, though still below the primary part's 600V rating. Application voltage requirements must be verified before substitution.

Q2: What is the difference between the NorComp 172-E25-113R001, 172-E25-113R021, and 172-E25-113R911?

A: All three NorComp parts share identical electrical specifications (25-position, 5A, gold finish, UL94 V-0). The differences are in flange configuration: 172-E25-113R001 features Housing/Shell (Unthreaded) flange; 172-E25-113R021 features Board Side (4-40) flange; 172-E25-113R911 features both Board Side (4-40) and Mating Side Female Screwlock (4-40) flanges with board lock capability. Selection depends on the mechanical mounting requirements of the application.

Q3: Are the Amphenol ICC (FCI) Delta D series parts (D25P24 base number) direct replacements for the L777TSBH25POL2?

A: Yes, from an electrical and mechanical standpoint. All Delta D variants (D25P24A4GX00LF, D25P24A4PL00LF, D25P24B4GV00LF, D25P24B6GV00LF) meet the critical requirements: 25-position, 2-row, shell size 3 (DB, B), through-hole solder termination, 5A current rating, and -55°C to 125°C operating range. The primary difference is voltage rating (300V versus 600V). Substitution is valid for applications operating at or below 300V.

Q4: Can I use a NorComp 172-E25 series part in place of the L777TSBH25POL2 in an application requiring -55°C operation?

A: No. NorComp 172-E25 series parts have a minimum operating temperature of -50°C, which does not meet the -55°C requirement of the primary part. HARTING 09653617713 or Amphenol ICC (FCI) Delta D series parts are suitable alternatives for -55°C applications.

Q5: What is the significance of the contact finish thickness specification (15.0µin for L777TSBH25POL2 versus 30.0µin for D25P24B6GV00LF)?

A: Contact finish thickness affects durability and wear resistance. The D25P24B6GV00LF with 30.0µin (0.76µm) gold plating provides thicker plating than the primary part's 15.0µin (0.38µm). Thicker plating generally offers extended contact life in high-cycle mating applications. For standard signal applications with infrequent mating, both thicknesses are functionally equivalent.

Q6: Are there packaging differences between the substitute parts?

A: Yes. The L777TSBH25POL2 and most Amphenol ICC (FCI) Delta D series parts are supplied in Tray packaging. HARTING parts (09643227235, 09643227240, 09653617713) are supplied in Bulk packaging. NorComp 172-E25 series parts are supplied in Tray packaging. Packaging affects handling, storage, and ordering quantities. Verify packaging compatibility with your procurement and assembly processes.

Q7: Which substitute part offers the best overall compatibility with the L777TSBH25POL2?

A: The Amphenol ICC (FCI) D25P24A4GX00LF, D25P24A4PL00LF, D25P24B4GV00LF, and D25P24B6GV00LF parts offer the highest compatibility. All four share the same manufacturer family (Amphenol ICC), identical electrical ratings (5A, -55°C to 125°C), matching contact finish (gold), identical flammability rating (UL94 V-0), and current RoHS compliance. The primary trade-off is voltage rating (300V versus 600V), which is acceptable for most signal applications.

Q8: Can I mix different substitute parts in the same assembly?

A: Mixing substitute parts is not recommended. While all listed parts meet the critical connector geometry requirements, variations in voltage rating, operating temperature range, contact finish thickness, and flange configuration may introduce inconsistencies in electrical performance and mechanical reliability. Maintain part consistency within a single assembly or system.

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