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L77DFBF25SU
Part Overview
The L77DFBF25SU is a 25-position D-Sub receptacle connector manufactured by Amphenol ICC in the DF series. This panel-mount, through-hole component features female sockets with solder termination, designed for general signal applications requiring a 300V rating and operating range of -55°C to 125°C. The part is currently in active production status with RoHS compliance. Alternative components are necessary to address specific application requirements, including different mounting configurations, flange types, temperature ranges, or compatibility with existing inventory systems.
Substiute Parts
Key Parameters
| Parameter | L77DFBF25SU |
|---|---|
| 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 |
| Contact Material | Copper Alloy |
| Current Rating | 7.5A |
| Voltage Rating | 300V |
| Operating Temperature | -55°C ~ 125°C |
| Material Flammability Rating | UL94 V-0 |
| RoHS Status | RoHS Compliant |
Substitute Part Grouping Explanation
Substitution eligibility is determined by the following mandatory electrical and mechanical parameters: connector type (receptacle, female sockets), number of positions (25), shell size (3/DB/B), contact type (signal), termination method (solder), and flange style compatibility. All substitute parts must maintain the same basic D-Sub 25-position receptacle configuration with through-hole solder termination to ensure mechanical and electrical interchangeability in the application.
The substitute parts are grouped into three categories based on flange and mounting characteristics:
NorComp Inc. 172-E Series (172-E25-213R001, 172-E25-213R011, 172-E25-213R031, 172-E25-213R911): Panel-mount, through-hole receptacles with unthreaded or threaded flange options (4-40 board side, mating side, or combination). All feature nickel-plated steel shells and brass contacts with gold flash plating.
TE Connectivity AMPLIMITE Series (2-338315-2, 2-747708-0, 207828-3, 207828-4, 5-338315-2, 5207828-4): Vertical through-hole receptacles with various flange options and shell finishes. These parts feature phosphor bronze contacts and tin-plated or unfinished steel shells, with temperature ratings of -55°C to 105°C and current capacities of 6A.
Substitution is valid only when the following parameters align: 25-position D-Sub receptacle, female sockets, solder termination, UL94 V-0 rating, and through-hole mounting compatibility.
Parameter Comparison
| Parameter | L77DFBF25SU | 172-E25-213R001 | 172-E25-213R011 | 172-E25-213R031 | 172-E25-213R911 | 2-338315-2 | 2-747708-0 | 207828-3 | 207828-4 | 5-338315-2 | 5207828-4 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Amphenol ICC | NorComp Inc. | NorComp Inc. | NorComp Inc. | NorComp Inc. | TE Connectivity | TE Connectivity | TE Connectivity | TE Connectivity | TE Connectivity | 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 |
| Contact Material | Copper Alloy | Brass | Brass | Brass | Brass | Phosphor Bronze | Phosphor Bronze | Phosphor Bronze | Phosphor Bronze | Phosphor Bronze | Phosphor Bronze |
| 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 | -55°C ~ 125°C | -50°C ~ 100°C | -50°C ~ 100°C | -50°C ~ 100°C | -50°C ~ 100°C | -55°C ~ 105°C | -55°C ~ 105°C | -55°C ~ 105°C | -55°C ~ 105°C | -55°C ~ 105°C | -55°C ~ 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 |
Engineering Selection Recommendations
Primary Substitutes with Full Compliance:
The NorComp Inc. 172-E series (172-E25-213R001, 172-E25-213R011, 172-E25-213R031, 172-E25-213R911) and TE Connectivity 5-338315-2 represent the closest electrical and mechanical equivalents, all maintaining UL94 V-0 flammability rating and RoHS3/RoHS compliance. These parts are suitable for applications where the L77DFBF25SU specification can accommodate the reduced current ratings (5A to 6A) and modified operating temperature range (-50°C to -55°C minimum).
Secondary Substitutes with Compliance Limitations:
TE Connectivity AMPLIMITE series parts (2-338315-2, 2-747708-0, 207828-3, 207828-4, 5207828-4) meet the core D-Sub 25-position receptacle specification and flammability requirements. Parts 2-747708-0, 207828-3, and 207828-4 carry RoHS non-compliance status and REACH Affected designations; these are suitable only for applications without RoHS or environmental compliance mandates.
Flange Type Considerations:
The original L77DFBF25SU features an unthreaded housing/shell flange. NorComp alternatives provide unthreaded (172-E25-213R001), board-side threaded (172-E25-213R011, 172-E25-213R911), and mating-side threaded (172-E25-213R031) options. TE Connectivity parts offer unthreaded (207828-3, 207828-4, 5-338315-2, 5207828-4), M3-threaded (2-338315-2), or 4-40-threaded (2-747708-0) flanges. Flange type selection depends on panel mounting requirements and mechanical interfaces.
Frequently Asked Questions (FAQ)
Q: Can the NorComp 172-E25 series replace the L77DFBF25SU in all applications?
A: The NorComp parts maintain the same 25-position D-Sub receptacle configuration, termination method, and flammability rating. However, the current rating is reduced from 7.5A to 5A, and the operating temperature range is restricted to -50°C to 100°C. Substitution is valid only when the application requirement does not exceed 5A current or require operation above 100°C.
Q: What is the difference between housing/shell flange types in the TE Connectivity AMPLIMITE series?
A: Housing/shell (M3) indicates an M3-threaded connection point on the connector body. Housing/shell (4-40) provides a 4-40 threaded mounting hole. Housing/shell (Unthreaded) offers a plain mounting face. The selection depends on the panel mounting hardware specification and mechanical assembly requirements.
Q: Are the NorComp parts with board-side and mating-side screwlock features mechanically compatible with the original panel-mount configuration?
A: The 172-E25-213R911 includes both board-side (4-40) and mating-side female screwlock (4-40) features, providing additional locking capability compared to the unthreaded housing of the L77DFBF25SU. Mechanical compatibility depends on whether the application panel and mating connector support these threaded features. If not required, use 172-E25-213R001 (unthreaded).
Q: What is the voltage rating difference between the L77DFBF25SU and TE Connectivity substitutes?
A: The L77DFBF25SU is rated for 300V, while several TE Connectivity parts specify 125V (2-747708-0, 207828-3, 207828-4, 5207828-4). Others do not specify a voltage rating. Substitution is valid for applications requiring 125V or less, or where voltage rating is not the limiting factor in the design.
Q: Which substitute parts are recommended for new designs requiring RoHS compliance?
A: The NorComp 172-E series (all variants) and TE Connectivity 5-338315-2 and 5207828-4 are marked as RoHS3 or RoHS Compliant. TE Connectivity 2-338315-2 is ROHS3 Compliant. Parts 2-747708-0, 207828-3, and 207828-4 are RoHS non-compliant and unsuitable for applications requiring environmental compliance certification.
Q: Does the contact material change (from Copper Alloy to Brass or Phosphor Bronze) affect electrical performance?
A: All contact materials are gold-plated, which provides the primary electrical interface. Brass and Phosphor Bronze offer different mechanical properties and cost profiles but deliver equivalent electrical performance in signaling applications when properly plated with gold.
Q: What packaging differences exist among the substitute options?
A: NorComp parts ship in Tray packaging. TE Connectivity options use either Tray (2-338315-2, 5-338315-2) or Tube (2-747708-0, 207828-3, 207828-4, 5207828-4) packaging. Packaging does not affect connector performance but impacts supply logistics and kit assembly procedures.
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