L77DB25ST D-Sub 25 Position Receptacle Equivalent & Substitute Parts

Part Overview

The L77DB25ST is a 25 position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This through-hole solder termination connector features female sockets in a vertical orientation with a tin-plated steel shell and gold-plated contacts. The part is currently in active production status with 639 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required, or when design specifications allow for compatible alternatives from different manufacturers. This reference provides engineering-validated substitute options based on electrical and mechanical parameter compatibility.

Key Parameters

Parameter	L77DB25ST Value
Connector Type	Receptacle, Female Sockets
Number of Positions	25
Shell Size / Layout	3 (DB, B)
Mounting Type	Through Hole
Termination	Solder
Current Rating	7.5A
Voltage Rating	300V
Operating Temperature	-55°C ~ 125°C
Shell Material / Finish	Steel, Tin Plated
Contact Finish	Gold
Flange Feature	Housing/Shell (Unthreaded)
RoHS Status	RoHS Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution compatibility for the L77DB25ST is determined by the following critical parameters:

Primary Compatibility Criteria:

Connector type: Receptacle, Female Sockets (mandatory)
Number of positions: 25 (mandatory)
Shell size and layout: 3 (DB, B) (mandatory)
Termination method: Solder (mandatory)
Mounting type: Through Hole (mandatory)

Secondary Compatibility Criteria:

Current rating: Minimum 5A (L77DB25ST rated 7.5A)
Voltage rating: Minimum 300V (L77DB25ST rated 300V)
Operating temperature range: Must encompass or overlap -55°C to 125°C
Contact material: Brass or Phosphor Bronze acceptable
Shell material: Steel with tin, nickel, or tin-nickel plating acceptable
Flange feature: Housing/Shell configurations (threaded or unthreaded) acceptable for through-hole mounting

Non-Critical Variations:

Packaging format (Tray, Bulk)
Contact finish thickness variations
Specific color designation
Dielectric material composition (thermoplastic or polyamide variants)

Substitute parts listed below meet all primary criteria and are compatible within the secondary parameter ranges.

Parameter Comparison

Part Number	Manufacturer	Positions	Mounting	Current (A)	Voltage (V)	Temp Range (°C)	Shell Finish	Status	RoHS
L77DB25ST	Amphenol ICC	25	Through Hole	7.5	300	-55 ~ 125	Steel, Tin	Active	Compliant
2-338315-2	TE Connectivity	25	Through Hole	6	Not Specified	-55 ~ 105	Steel, Tin	Active	ROHS3
6-338315-2	TE Connectivity	25	Through Hole	6	Not Specified	-55 ~ 105	Steel, Tin	Active	Compliant
D25S24A4GL00LF	Amphenol ICC (FCI)	25	Through Hole	5	300	-55 ~ 125	Steel, Tin-Nickel	Active	Compliant
D25S24A4GX00LF	Amphenol ICC (FCI)	25	Through Hole	5	300	-55 ~ 125	Steel, Tin-Nickel	Active	Compliant
D25S24A4PL00LF	Amphenol ICC (FCI)	25	Through Hole	5	300	-55 ~ 125	Steel, Tin-Nickel	Active	Compliant
D25S24A6GX00LF	Amphenol ICC (FCI)	25	Through Hole	5	300	-55 ~ 125	Steel, Tin-Nickel	Active	Compliant
172-025-212R011	NorComp Inc.	25	Panel Mount, Through Hole	5	Not Specified	-50 ~ 100	Steel, Tin	Obsolete	ROHS3
172-025-212R021	NorComp Inc.	25	Panel Mount, Through Hole	5	Not Specified	-50 ~ 100	Steel, Tin	Obsolete	ROHS3
172-E25-213R001	NorComp Inc.	25	Panel Mount, Through Hole	5	Not Specified	-50 ~ 100	Steel, Nickel	Active	ROHS3
172-E25-213R911	NorComp Inc.	25	Panel Mount, Through Hole	5	Not Specified	-50 ~ 100	Steel, Nickel	Active	ROHS3

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Preferred)

The following parts are recommended as primary substitutes based on active product status, full RoHS compliance, and matching electrical specifications:

D25S24A4GL00LF (Amphenol ICC FCI, Delta D Series): Active status, RoHS compliant, 300V rating, -55°C to 125°C operating range. Current rating of 5A per contact is within acceptable range for most applications. Tin-nickel plated shell provides enhanced corrosion resistance compared to tin plating.
D25S24A4GX00LF (Amphenol ICC FCI, Delta D Series): Active status, RoHS compliant, identical electrical specifications to D25S24A4GL00LF. Flange feature variation (4-40 vs M3) allows selection based on mounting hole requirements.
D25S24A6GX00LF (Amphenol ICC FCI, Delta D Series): Active status, RoHS compliant, 30.0µin gold contact finish thickness specification. Suitable for applications requiring enhanced contact durability.

Tier 2 - Compatible Substitutes (Secondary Options)

2-338315-2 and 6-338315-2 (TE Connectivity AMPLIMITE HDP-20): Active status, RoHS compliant. 6A current rating and -55°C to 105°C operating range are acceptable for most applications. Packaging variation (Bulk vs Tray) available. Note: Voltage rating not specified in documentation.

Tier 3 - Limited Substitutes (Restricted Use)

172-E25-213R001 and 172-E25-213R911 (NorComp Inc., 172-E Series): Active status, ROHS3 compliant. Operating temperature range limited to -50°C to 100°C, which does not fully encompass the L77DB25ST specification of -55°C to 125°C. Current rating of 5A is acceptable. Suitable only for applications within the narrower temperature range.

Not Recommended

172-025-212R011 and 172-025-212R021 (NorComp Inc., 172 Series): Obsolete product status. While electrically compatible, obsolete parts present supply chain risk and should be avoided for new designs.

Frequently Asked Questions (FAQ)

Q: Can I substitute a D25S24A4GL00LF for the L77DB25ST in my application?

A: Yes, the D25S24A4GL00LF is a compatible substitute. Both parts are 25 position D-Sub receptacles with solder termination, through-hole mounting, and 300V rating. The D25S24A4GL00LF has a 5A per contact current rating compared to the L77DB25ST's 7.5A rating. Verify that your application current requirements do not exceed 5A per contact. Both parts support the full -55°C to 125°C operating temperature range.

Q: What is the difference between the Amphenol ICC L77DB25ST and the Amphenol ICC (FCI) D25S24 series?

A: Both are manufactured by Amphenol ICC but represent different product lines. The L77DB25ST is from the standard commercial line with tin-plated steel shell. The D25S24 series (Delta D) features tin-nickel plated shells, which provide improved corrosion resistance. The D25S24 series includes board lock features on certain variants. Electrical performance and connector geometry are compatible.

Q: Why do some substitute parts have lower current ratings (5A vs 7.5A)?

A: Current rating is determined by contact design and material composition. The L77DB25ST uses brass contacts rated at 7.5A. Many substitute parts use phosphor bronze contacts with 5A or 6A ratings. For applications requiring the full 7.5A rating, select substitutes with matching or higher current specifications. For applications operating below 5A per contact, lower-rated substitutes are acceptable.

Q: Can I use the NorComp 172-E25 series as a substitute?

A: The NorComp 172-E25 series is electrically compatible but has a restricted operating temperature range of -50°C to 100°C, compared to the L77DB25ST's -55°C to 125°C. Use the NorComp parts only if your application operates within the narrower temperature range. For applications requiring full temperature coverage, select Amphenol or TE Connectivity alternatives.

Q: What is the significance of the flange feature designation (M3, 4-40, Unthreaded)?

A: The flange feature indicates the mounting hole configuration on the connector shell. M3 refers to metric M3 threaded holes, 4-40 refers to UNC #4-40 threaded holes, and Unthreaded indicates smooth holes for through-hole mounting without threaded fasteners. Select the flange feature based on your PCB or panel mounting hole pattern. All three configurations are mechanically compatible with standard D-Sub 25 position receptacles.

Q: Are all listed substitutes RoHS compliant?

A: Yes, all active and recommended substitute parts listed are RoHS compliant or ROHS3 compliant. The L77DB25ST is RoHS compliant. TE Connectivity parts are ROHS3 compliant. NorComp active parts are ROHS3 compliant. Obsolete NorComp parts (172-025 series) are ROHS3 compliant but should not be used due to product status.

Q: What packaging options are available for substitutes?

A: The L77DB25ST is supplied in Tray packaging. Substitute parts are available in Tray or Bulk packaging. Tray packaging is standard for production use. Bulk packaging may be available for high-volume applications. Verify packaging availability with your supplier when selecting substitutes.

Q: Can I mix L77DB25ST and substitute connectors in the same assembly?

A: Yes, all listed compatible substitutes can be used interchangeably in the same assembly provided they meet the application's electrical and environmental requirements. Ensure that all connectors in an assembly meet the most stringent requirements of your application (highest current, widest temperature range, highest voltage).

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