L77DB25SOL2RM8

Part Overview

The L77DB25SOL2RM8 is a 25-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products), designed for through-hole soldering applications. This connector features female sockets in a vertical orientation with a DB/B shell size (3) and is currently in active production status. The component is RoHS compliant and UL94 V-0 rated, suitable for applications requiring 300V rated signal connectivity with current capacity of 7.5A per contact. Alternative equivalent and substitute parts are necessary to provide design flexibility, manage supply chain continuity, accommodate different mounting preferences, and address specific mechanical requirements such as panel mounting or alternative flange configurations.

Key Parameters

Parameter	Value
Connector Style	D-Sub
Connector Type	Receptacle, Female Sockets
Number of Positions	25
Number of Rows	2
Shell Size, Connector Layout	3 (DB, B)
Mounting Type	Through Hole
Shell Material, Finish	Steel, Tin Plated
Contact Finish	Gold
Current Rating (Amps)	7.5A
Voltage Rating	300V
Operating Temperature	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
Contact Material	Brass
Termination	Solder
RoHS Status	RoHS Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the L77DB25SOL2RM8 are classified based on the following core parameters that determine compatibility:

Electrical Parameters: All substitute parts maintain 25-position D-Sub receptacle configuration with female sockets and shell size 3 (DB, B). Connectivity and signal integrity are preserved through consistent connector style and position count.

Mechanical Parameters: Mounting type variations are the primary differentiation among substitutes. The main part specifies through-hole mounting. Substitute parts may feature alternative mounting configurations including panel mount (various flange types), which affect mechanical installation but not electrical performance within the specified signal class.

Material & Environmental: Acceptable substitutes utilize steel shell construction with gold-plated contacts as a baseline. Operating temperature ranges, flammability ratings (UL94 V-0), and dielectric materials vary but must support the intended application environment. Contact material alternatives (Brass, Phosphor Bronze) are functionally equivalent for signal applications.

Current & Voltage: The main part supports 7.5A at 300V. Substitute parts with lower current ratings (5A, 6A) are acceptable for applications not requiring full 7.5A capacity. Voltage ratings where specified must equal or exceed 300V.

Compliance: RoHS and REACH status variations are documented. All parts listed maintain UL94 V-0 flame rating and are suitable for equivalent electrical environments.

Parameter Comparison

Part Number	Manufacturer	Product Status	Mounting Type	Flange Feature	Current Rating (Amps)	Voltage Rating	Operating Temperature	Contact Material	Shell Material, Finish	Contact Finish	RoHS Status
L77DB25SOL2RM8	Amphenol ICC (Commercial Products)	Active	Through Hole	Housing/Shell (Unthreaded)	7.5A	300V	-55°C ~ 125°C	Brass	Steel, Tin Plated	Gold	RoHS Compliant
172-025-212R011	NorComp Inc.	Obsolete	Panel Mount, Through Hole	Board Side (4-40)	5A	-	-50°C ~ 100°C	Brass	Steel, Tin Plated	Gold	ROHS3 Compliant
172-025-212R021	NorComp Inc.	Obsolete	Panel Mount, Through Hole	Board Side (4-40)	5A	-	-50°C ~ 100°C	Brass	Steel, Tin Plated	Gold	ROHS3 Compliant
172-E25-213R001	NorComp Inc.	Active	Panel Mount, Through Hole	Housing/Shell (Unthreaded)	5A	-	-50°C ~ 100°C	Brass	Steel, Nickel Plated	Gold	ROHS3 Compliant
172-E25-213R011	NorComp Inc.	Active	Panel Mount, Through Hole	Board Side (4-40)	5A	-	-50°C ~ 100°C	Brass	Steel, Nickel Plated	Gold	ROHS3 Compliant
172-E25-213R031	NorComp Inc.	Active	Panel Mount, Through Hole	Mating Side (4-40)	5A	-	-50°C ~ 100°C	Brass	Steel, Nickel Plated	Gold	ROHS3 Compliant
172-E25-213R911	NorComp Inc.	Active	Panel Mount, Through Hole	Board Side (4-40), Mating Side, Female Screwlock (4-40)	5A	-	-50°C ~ 100°C	Brass	Steel, Nickel Plated	Gold	ROHS3 Compliant
2-338315-2	TE Connectivity AMP Connectors	Active	Through Hole	Housing/Shell (M3)	6A	-	-55°C ~ 105°C	Phosphor Bronze	Steel, Tin Plated	Gold	ROHS3 Compliant
6-338315-2	TE Connectivity AMP Connectors	Active	Through Hole	Housing/Shell (4-40)	6A	-	-55°C ~ 105°C	Phosphor Bronze	Steel, Tin Plated	Gold	RoHS Compliant
D25S24A4GL00LF	Amphenol ICC (FCI)	Active	Through Hole	Housing/Shell (M3)	5A per Contact	300V	-55°C ~ 125°C	Phosphor Bronze	Steel, Tin-Nickel Plated	Gold	RoHS Compliant
D25S24A4GX00LF	Amphenol ICC (FCI)	Active	Through Hole	Housing/Shell (4-40)	5A per Contact	300V	-55°C ~ 125°C	Phosphor Bronze	Steel, Tin-Nickel Plated	Gold	RoHS Compliant

Engineering Selection Recommendations

Active Status Parts: For new designs or procurement requiring long-term availability, prioritize parts with Active product status. The L77DB25SOL2RM8, 172-E25 series (NorComp), 2-338315-2, 6-338315-2, and D25S24 series (Amphenol FCI) are all currently in active production and represent the most reliable sourcing path.

Obsolete Parts: The NorComp 172-025 series (172-025-212R011, 172-025-212R021) are marked Obsolete and should only be used for legacy system maintenance or repair where form-fit-function compatibility is verified.

RoHS Compliance: All listed parts maintain RoHS compliance (either RoHS Compliant or ROHS3 Compliant), suitable for applications requiring lead-free construction. The main part is RoHS Compliant; NorComp 172-E25 variants and TE Connectivity parts are ROHS3 Compliant.

Operating Temperature Alignment: The L77DB25SOL2RM8 supports -55°C ~ 125°C. Amphenol FCI D25S24 series and TE Connectivity 2-338315-2 match this full range. NorComp parts specify -50°C ~ 100°C and are suitable for applications within this narrower envelope. TE Connectivity 6-338315-2 supports -55°C ~ 105°C.

Mounting Configuration Selection: Through-hole vertical mounting (identical to main part) is provided by L77DB25SOL2RM8, 2-338315-2, 6-338315-2, D25S24A4GL00LF, and D25S24A4GX00LF. Panel mount variants (172-025 and 172-E25 series) require mechanical redesign but offer alternative installation methods.

Frequently Asked Questions (FAQ)

Q: Can I use a lower current-rated part as a substitute for the L77DB25SOL2RM8? A: The L77DB25SOL2RM8 is rated at 7.5A per contact. Substitute parts with 5A or 6A ratings are only suitable if your application does not exceed these current limits. Current is a hard electrical limit; choosing an undersized part for higher-current applications will result in component failure.

Q: What is the difference between the various NorComp 172-E25 series parts? A: The 172-E25 series differs by flange feature configuration. 172-E25-213R001 has unthreaded housing flange (board mounting). 172-E25-213R011 has board-side threaded flange (4-40). 172-E25-213R031 has mating-side threaded flange (4-40). 172-E25-213R911 includes both board-side and mating-side female screwlock features. All are electrically identical 25-position receptacles with identical contact materials and finishes; mechanical mounting attachment method is the sole distinction.

Q: Why are there two TE Connectivity part numbers (2-338315-2 and 6-338315-2) that appear nearly identical? A: Both are 25-position D-Sub receptacles in the AMPLIMITE HDP-20 series with identical electrical ratings. The primary difference is the flange feature: 2-338315-2 uses Housing/Shell (M3) mounting, while 6-338315-2 uses Housing/Shell (4-40) mounting. Additionally, 6-338315-2 is packaged in Tray (versus Bulk for 2-338315-2), and RoHS/REACH compliance designations differ. Select based on your required flange mounting specification and compliance requirements.

Q: Are the Amphenol FCI D25S24 series parts (D25S24A4GL00LF and D25S24A4GX00LF) direct equivalents to the L77DB25SOL2RM8? A: Both D25S24 parts share electrical equivalence with the main part: 25 positions, 300V rating, -55°C ~ 125°C operating range, RoHS Compliant, and UL94 V-0 flammability. The primary distinction is current rating: D25S24 series rates 5A per contact versus the L77DB25SOL2RM8 at 7.5A per contact. They differ also in contact material (Phosphor Bronze versus Brass) and shell finish (Tin-Nickel versus Tin Plated). These are suitable as equivalent parts only if application current does not exceed 5A per contact.

Q: What does "Board Lock" feature mean on certain connectors? A: Board Lock refers to a mechanical locking mechanism that secures the connector to the printed circuit board during soldering and prevents unintended displacement during assembly. Both the main part (L77DB25SOL2RM8) and several substitutes (2-338315-2, 6-338315-2, 172-E25-213R911) incorporate this feature. Parts without Board Lock designation may require alternative mechanical retention methods.

Q: Which substitute part is the best choice for a direct replacement? A: For electrical and thermal performance matching without mechanical redesign, select D25S24A4GL00LF or D25S24A4GX00LF (Amphenol FCI Delta D series) if your application current does not exceed 5A per contact. Both maintain 300V rating, -55°C ~ 125°C operation, and RoHS compliance. The difference between D25S24A4GL00LF and D25S24A4GX00LF is flange configuration: M3 versus 4-40 mounting holes. If higher current capacity (6A-7.5A) is required, verify availability of the original L77DB25SOL2RM8 before considering lower-rated alternatives.

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