L77DBH25ST Equivalent & Substitute Parts

Part Overview

The L77DBH25ST is a 25-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets with through-hole mounting, solder termination, and tin-plated steel shell with gold-plated contacts. The part is currently Active in product status with 927 units in stock.

Substitute parts are necessary when the original manufacturer part becomes unavailable, when design modifications require different mounting configurations or material specifications, or when alternative suppliers offer equivalent functionality with different packaging or compliance certifications.

Key Parameters

Parameter	L77DBH25ST Value
Connector Type	Receptacle, Female Sockets
Number of Positions	25
Shell Size / Layout	3 (DB, B)
Mounting Type	Through Hole
Termination	Solder
Shell Material / Finish	Steel, Tin Plated
Contact Finish	Gold
Current Rating	7.5A
Voltage Rating	300V
Operating Temperature Range	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of D-Sub receptacle connectors is determined by the following critical parameters:

Core Electrical and Mechanical Compatibility:

Connector type (receptacle, female sockets)
Number of positions (25)
Shell size and layout (3 / DB-B)
Mounting type (through-hole compatibility)
Termination method (solder)

Performance Compatibility:

Current rating must be sufficient for application requirements
Voltage rating must meet or exceed circuit requirements
Operating temperature range must cover application environment
Flammability rating (UL94 V-0)

Material and Compliance Considerations:

Shell material finish variations (tin-plated vs. nickel-plated)
Contact finish and thickness specifications
RoHS and REACH compliance status

The substitute parts listed below maintain identical core specifications (25-position D-Sub receptacle with solder termination and through-hole mounting) while offering variations in flange design, shell material finishes, and supplier-specific enhancements.

Parameter Comparison

Part Number	Manufacturer	Connector Type	Positions	Mounting	Shell Material / Finish	Contact Finish	Current Rating (A)	Voltage Rating (V)	Operating Temp (°C)	Product Status	RoHS
L77DBH25ST	Amphenol ICC	Receptacle, Female	25	Through Hole	Steel, Tin Plated	Gold	7.5	300	-55 ~ 125	Active	Compliant
172-025-212R011	NorComp Inc.	Receptacle, Female	25	Panel/Through Hole	Steel, Tin Plated	Gold	5.0	Not Specified	-50 ~ 100	Obsolete	ROHS3
172-025-212R021	NorComp Inc.	Receptacle, Female	25	Panel/Through Hole	Steel, Tin Plated	Gold	5.0	Not Specified	-50 ~ 100	Obsolete	ROHS3
172-E25-213R001	NorComp Inc.	Receptacle, Female	25	Panel/Through Hole	Steel, Nickel Plated	Gold	5.0	Not Specified	-50 ~ 100	Active	ROHS3
172-E25-213R011	NorComp Inc.	Receptacle, Female	25	Panel/Through Hole	Steel, Nickel Plated	Gold	5.0	Not Specified	-50 ~ 100	Active	ROHS3
172-E25-213R031	NorComp Inc.	Receptacle, Female	25	Panel/Through Hole	Steel, Nickel Plated	Gold	5.0	Not Specified	-50 ~ 100	Active	ROHS3
172-E25-213R911	NorComp Inc.	Receptacle, Female	25	Panel/Through Hole	Steel, Nickel Plated	Gold	5.0	Not Specified	-50 ~ 100	Active	ROHS3
2-338315-2	TE Connectivity AMP	Receptacle, Female	25	Through Hole	Steel, Tin Plated	Gold	6.0	Not Specified	-55 ~ 105	Active	ROHS3
6-338315-2	TE Connectivity AMP	Receptacle, Female	25	Through Hole	Steel, Tin Plated	Gold	6.0	Not Specified	-55 ~ 105	Active	Compliant
D25S24A4GL00LF	Amphenol ICC (FCI)	Receptacle, Female	25	Through Hole	Steel, Tin-Nickel Plated	Gold	5.0	300	-55 ~ 125	Active	Compliant
D25S24A4GX00LF	Amphenol ICC (FCI)	Receptacle, Female	25	Through Hole	Steel, Tin-Nickel Plated	Gold	5.0	300	-55 ~ 125	Active	Compliant

Engineering Selection Recommendations

Direct Substitutes (Active Product Status):

The D25S24A4GL00LF and D25S24A4GX00LF from Amphenol ICC (FCI Delta D series) are the primary recommended substitutes. Both parts maintain identical operating temperature range (-55°C to 125°C), voltage rating (300V), and RoHS compliance as the L77DBH25ST. These parts differ only in flange configuration (M3 housing/shell vs. 4-40 mounting holes). Both are currently Active in product status with substantial inventory availability.

Secondary Substitutes (Active Status, Modified Electrical Parameters):

The TE Connectivity AMP Connectors (2-338315-2 and 6-338315-2) from the AMPLIMITE HDP-20 series provide through-hole mounting with slightly reduced current rating (6A vs. 7.5A) and operating temperature range (-55°C to 105°C vs. -55°C to 125°C). Both are currently Active and ROHS3 compliant. Voltage rating is not specified for these parts.

The NorComp Inc. 172-E series (172-E25-213R001, 172-E25-213R011, 172-E25-213R031, 172-E25-213R911) offers panel mount with through-hole capability, nickel-plated shells, and ROHS3 compliance. These parts have reduced current rating (5A) and narrower operating temperature range (-50°C to 100°C). All are currently Active in product status.

Legacy Substitutes (Obsolete Status):

The NorComp Inc. 172-025-212R011 and 172-025-212R021 are obsolete and should be avoided for new designs or production runs requiring long-term availability.

Frequently Asked Questions (FAQ)

Q: Can I substitute the L77DBH25ST with a lower current-rated part?

A: Substitution with lower current ratings (5A or 6A) is possible only if your application current requirements do not exceed the lower rating. The L77DBH25ST is rated for 7.5A; parts with 5A or 6A ratings must be evaluated against actual circuit requirements.

Q: What is the difference between the D25S24A4GL00LF and D25S24A4GX00LF?

A: Both are electrically and thermally equivalent. The primary difference is mounting configuration: D25S24A4GL00LF has M3 housing/shell mounting, while D25S24A4GX00LF has 4-40 mounting holes. Select based on your PCB or enclosure mounting requirements.

Q: Are NorComp 172-E25 series parts suitable as direct replacements?

A: The 172-E25 series provides mechanical compatibility (25-position D-Sub receptacle, solder termination, through-hole mounting). However, they have reduced current rating (5A vs. 7.5A) and narrower operating temperature range (-50°C to 100°C vs. -55°C to 125°C). Confirmation against your application specifications is required before substitution.

Q: What is the difference between tin-plated and nickel-plated shell finishes?

A: Both finishes provide corrosion resistance on steel shells. Tin plating (L77DBH25ST, 2-338315-2, 6-338315-2) offers standard electromagnetic shielding. Nickel plating (172-E25 series) provides alternative surface properties. Selection depends on environmental exposure and application-specific shielding requirements.

Q: Should I use obsolete NorComp 172-025 series parts?

A: The 172-025-212R011 and 172-025-212R021 are marked Obsolete and carry reduced current rating (5A) and narrower operating temperature range. Use of obsolete parts is not recommended for production designs or applications requiring long-term component availability.

Q: Can I use TE Connectivity parts with unspecified voltage rating?

A: The 2-338315-2 and 6-338315-2 do not have specified voltage ratings in the provided documentation. The L77DBH25ST specifies 300V. Confirm voltage requirements with TE Connectivity technical documentation before substitution if your application has voltage specifications above standard signal levels.

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