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L77DFB25ST D-Sub 25 Position Receptacle Connector
Part Overview
The L77DFB25ST is a 25 position D-Sub receptacle connector manufactured by Amphenol ICC, designed for panel mount, through-hole solder applications. This connector features female sockets in a DB/B shell size configuration with tin-plated steel housing and gold-plated contacts. The part is active in production with 1047 units currently in stock.
Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers are preferred for supply chain diversification, or when specific flange configurations or compliance requirements differ from the original specification.
Substiute Parts
Key Parameters
| Parameter | L77DFB25ST Specification |
|---|---|
| Connector Type | Receptacle, Female Sockets |
| Number of Positions | 25 |
| Shell Size, Connector Layout | 3 (DB, B) |
| Mounting Type | Panel Mount, Through Hole |
| Flange Feature | Housing/Shell (Unthreaded) |
| Termination | Solder |
| Shell Material, Finish | Steel, Tin Plated |
| Contact Finish | Gold |
| Current Rating | 7.5A |
| Voltage Rating | 300V |
| Operating Temperature Range | -55°C to 125°C |
| Material Flammability Rating | UL94 V-0 |
| RoHS Status | RoHS Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the L77DFB25ST is determined by the following critical parameters:
- Connector type must be receptacle with female sockets
- Position count must be 25
- Shell size must be DB/B (Size 3)
- Mounting configuration must support panel mount, through-hole solder termination
- Flange feature determines mechanical compatibility with the mounting surface
- Current and voltage ratings establish electrical performance boundaries
- Operating temperature range defines thermal operating limits
- Material flammability and RoHS compliance address regulatory requirements
Substitute parts are grouped by flange configuration and manufacturer series. Parts with different flange features (board side, mating side, or unthreaded housing) may require mechanical redesign of the mounting interface but maintain electrical compatibility when electrical parameters remain within acceptable limits.
Parameter Comparison
| Parameter | L77DFB25ST (Amphenol ICC) | 172-E25-213R001 (NorComp) | 172-E25-213R011 (NorComp) | 172-E25-213R031 (NorComp) | 172-E25-213R911 (NorComp) | 2-338315-2 (TE Connectivity) | 2-747708-0 (TE Connectivity) | 207828-3 (TE Connectivity) | 207828-4 (TE Connectivity) | 5-338315-2 (TE Connectivity) | 5207828-4 (TE Connectivity) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Connector Type | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets |
| Number of Positions | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Shell Size, Connector Layout | 3 (DB, B) | 3 (DB, B) | 3 (DB, B) | 3 (DB, B) | 3 (DB, B) | 3 (DB, B) | 3 (DB, B) | 3 (DB, B) | 3 (DB, B) | 3 (DB, B) | 3 (DB, B) |
| Mounting Type | Panel Mount, Through Hole | Panel Mount, Through Hole | Panel Mount, Through Hole | Panel Mount, Through Hole | Panel Mount, Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole |
| Flange Feature | Housing/Shell (Unthreaded) | Housing/Shell (Unthreaded) | Board Side (4-40) | Mating Side (4-40) | Board Side (4-40), Mating Side Female Screwlock (4-40) | Housing/Shell (M3) | Housing/Shell (4-40) | Housing/Shell (Unthreaded) | Housing/Shell (Unthreaded) | Housing/Shell (Unthreaded) | Housing/Shell (Unthreaded) |
| Termination | Solder | Solder | Solder | Solder | Solder | Solder | Solder | Solder | Solder | Solder | Solder |
| Shell Material, Finish | Steel, Tin Plated | Steel, Nickel Plated | Steel, Nickel Plated | Steel, Nickel Plated | Steel, Nickel Plated | Steel, Tin Plated | Steel, Tin Plated | Not Specified | Not Specified | Steel, Tin Plated | Not Specified |
| Contact Finish | Gold | Gold | Gold | Gold | Gold | Gold | Gold | Gold | Gold | Gold | Gold |
| Current Rating (Amps) | 7.5A | 5A | 5A | 5A | 5A | 6A | 6A | 6A | 6A | 6A | 6A |
| Voltage Rating | 300V | Not Specified | Not Specified | Not Specified | Not Specified | Not Specified | 125V | 125V | 125V | Not Specified | 125V |
| Operating Temperature Range | -55°C to 125°C | -50°C to 100°C | -50°C to 100°C | -50°C to 100°C | -50°C to 100°C | -55°C to 105°C | -55°C to 105°C | -55°C to 105°C | -55°C to 105°C | -55°C to 105°C | -55°C to 105°C |
| Material Flammability Rating | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 |
| RoHS Status | RoHS Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | RoHS non-compliant | RoHS non-compliant | RoHS non-compliant | ROHS3 Compliant | RoHS Compliant |
| Contact Material | Copper Alloy | Brass | Brass | Brass | Brass | Phosphor Bronze | Phosphor Bronze | Phosphor Bronze | Phosphor Bronze | Phosphor Bronze | Phosphor Bronze |
| Inventory (Pcs) | 1047 | 1741 | 1042 | 1317 | 3289 | 1204 | 2038 | 1434 | 861 | 769 | 1390 |
Engineering Selection Recommendations
The L77DFB25ST can be substituted with the following parts based on electrical and mechanical compatibility:
NorComp 172-E Series (172-E25-213R001, 172-E25-213R011, 172-E25-213R031, 172-E25-213R911): These parts maintain the same connector type, position count, and shell size. All are ROHS3 compliant and UL94 V-0 rated. The 172-E25-213R001 with unthreaded housing provides the closest mechanical match to the L77DFB25ST. Variants with board-side or mating-side flanges require mechanical interface redesign. Current rating is reduced to 5A, and operating temperature maximum is 100°C. These parts are suitable for applications where the lower current and temperature ratings are acceptable.
TE Connectivity AMPLIMITE HDP-20 Series (2-338315-2, 5-338315-2): These parts feature through-hole mounting with unthreaded housing (2-338315-2) or M3 threaded housing (2-338315-2). Both are ROHS3 compliant with 6A current rating and -55°C to 105°C operating range. The 5-338315-2 with unthreaded housing provides direct mechanical compatibility. Contact material is phosphor bronze rather than copper alloy.
TE Connectivity AMPLIMITE HD-20 Series (2-747708-0, 207828-3, 207828-4, 5207828-4): These parts support through-hole mounting with unthreaded housing. Operating temperature range is -55°C to 105°C with 6A current rating. Voltage rating is specified at 125V. Parts 207828-3, 207828-4, and 5207828-4 are mechanically compatible with unthreaded housing. Parts 207828-3 and 207828-4 are RoHS non-compliant and REACH affected. Part 5207828-4 is RoHS compliant with vendor-undefined REACH status.
Compliance Considerations: For applications requiring RoHS compliance, select from ROHS3 compliant substitutes: NorComp 172-E series, TE Connectivity 2-338315-2, 5-338315-2, or 5207828-4. Avoid 2-747708-0, 207828-3, and 207828-4 if RoHS compliance is mandatory.
Current and Voltage Derating: The L77DFB25ST operates at 7.5A and 300V. NorComp substitutes are rated at 5A with unspecified voltage. TE Connectivity substitutes are rated at 6A with 125V specified (except 2-338315-2 and 5-338315-2 with unspecified voltage). Verify application current and voltage requirements before substitution.
Temperature Range Derating: NorComp parts operate to 100°C maximum, compared to 125°C for the L77DFB25ST. TE Connectivity parts operate to 105°C. Applications requiring operation above 105°C require the original L77DFB25ST.
Frequently Asked Questions (FAQ)
Q: Can I substitute a NorComp 172-E25 connector for the L77DFB25ST in my application?
A: Substitution is possible if your application current requirement does not exceed 5A and maximum operating temperature does not exceed 100°C. The connector maintains the same 25-position DB/B shell configuration and solder termination. Verify that the flange configuration (unthreaded housing for 172-E25-213R001) matches your panel mount interface. Shell finish differs (nickel plated vs. tin plated), and contact material is brass rather than copper alloy.
Q: What is the difference between the TE Connectivity 2-338315-2 and 5-338315-2?
A: Both parts are AMPLIMITE HDP-20 series with identical electrical specifications (6A, -55°C to 105°C, UL94 V-0). The 2-338315-2 features M3 threaded housing flange, while the 5-338315-2 features unthreaded housing. Select based on your panel mount interface requirements. The 5-338315-2 with unthreaded housing provides closer mechanical compatibility to the L77DFB25ST.
Q: Why do some substitute parts have lower current ratings than the L77DFB25ST?
A: Current rating is determined by contact material, contact geometry, and shell design. The L77DFB25ST is rated at 7.5A with copper alloy contacts. NorComp substitutes with brass contacts are rated at 5A. TE Connectivity substitutes with phosphor bronze contacts are rated at 6A. These differences reflect the electrical performance characteristics of each connector design. Select substitutes only if your application current does not exceed the substitute part's rating.
Q: Are the TE Connectivity 207828 series parts suitable replacements?
A: The 207828-3 and 207828-4 are mechanically compatible with unthreaded housing and maintain the same 25-position DB/B configuration. However, both parts are RoHS non-compliant and REACH affected. Use these parts only in applications where RoHS compliance is not required. The 5207828-4 variant is RoHS compliant and represents a better choice for regulated applications.
Q: What mounting interface differences exist between substitute parts?
A: The L77DFB25ST features unthreaded housing/shell flange. NorComp 172-E25-213R001 also features unthreaded housing and provides direct mechanical compatibility. NorComp 172-E25-213R011 features board-side 4-40 threaded flange. NorComp 172-E25-213R031 features mating-side 4-40 threaded flange. NorComp 172-E25-213R911 features both board-side and mating-side 4-40 flanges with board lock feature. TE Connectivity 2-338315-2 features M3 threaded housing. TE Connectivity 2-747708-0 features 4-40 threaded housing. TE Connectivity 207828 series and 5207828-4 feature unthreaded housing. Verify your panel mount interface before selecting a substitute with different flange configuration.
Q: Can I use a substitute part with a lower voltage rating?
A: The L77DFB25ST is rated at 300V. NorComp substitutes do not specify voltage rating. TE Connectivity substitutes specify 125V (2-747708-0, 207828-3, 207828-4, 5207828-4) or do not specify voltage (2-338315-2, 5-338315-2). Use substitutes with specified voltage ratings only if your application voltage does not exceed the substitute part's rating. For applications requiring 300V operation, verify that unspecified voltage ratings are adequate through the manufacturer or select the original L77DFB25ST.
Q: Which substitute offers the best overall compatibility?
A: The TE Connectivity 5-338315-2 provides the closest overall compatibility: unthreaded housing flange matches the L77DFB25ST, 6A current rating is closest to 7.5A, operating temperature range is -55°C to 105°C (exceeds NorComp 100°C maximum), ROHS3 compliant, and UL94 V-0 rated. The NorComp 172-E25-213R001 with unthreaded housing is also compatible but has reduced current (5A) and temperature (100°C) ratings.
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