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L77DB25SOL2C309 Equivalent & Substitute Parts
Part Overview
The L77DB25SOL2C309 is a 25-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This female sockets connector features vertical solder termination and is designed for through-hole mounting applications. The connector is currently in active product status with 1099 units in stock.
Equivalent and substitute parts are necessary when the primary part becomes unavailable, when design requirements demand alternative mounting configurations, or when application-specific certifications or environmental ratings necessitate alternative solutions. This reference provides engineering-validated substitute options based on strict electrical and mechanical parameter compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Connector Type | Receptacle, Female Sockets |
| Number of Positions | 25 |
| Number of Rows | 2 |
| Shell Size, Connector Layout | 3 (DB, B) |
| Mounting Type | Through Hole |
| Termination | Solder |
| 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 |
| RoHS Status | RoHS Compliant |
Substitute Part Grouping Explanation
Substitution compatibility for the L77DB25SOL2C309 is determined by the following mandatory parameters:
Core Compatibility Parameters:
- Connector type: Receptacle, Female Sockets
- Position count: 25 positions
- Row configuration: 2 rows
- Shell size: 3 (DB, B)
- Termination method: Solder
- Mounting category: Through Hole
Performance Parameters:
- Voltage rating: 300V minimum
- Operating temperature range: Must encompass -55°C to 125°C
- Current rating: Minimum 5A per contact
- Material flammability: UL94 V-0
Compliance Parameters:
- RoHS compliance status
- Contact material and finish specifications
Substitute parts are grouped into two categories: direct equivalents with identical mounting configurations, and functional equivalents with alternative flange features that accommodate different board-level mounting requirements while maintaining electrical and mechanical compatibility.
Parameter Comparison
| Parameter | L77DB25SOL2C309 | 2-338315-2 | 6-338315-2 | D25S24A4GL00LF | D25S24A4GX00LF | 172-025-212R021 | 172-E25-213R001 | 172-E25-213R011 | 172-E25-213R031 | 172-E25-213R911 |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Amphenol ICC | TE Connectivity | TE Connectivity | Amphenol ICC (FCI) | Amphenol ICC (FCI) | NorComp Inc. | NorComp Inc. | NorComp Inc. | NorComp Inc. | NorComp Inc. |
| 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 |
| Number of Positions | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Number of Rows | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Shell Size | 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 | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Panel Mount, Through Hole | Panel Mount, Through Hole | Panel Mount, Through Hole | Panel Mount, Through Hole | Panel Mount, Through Hole |
| Termination | Solder | Solder | Solder | Solder | Solder | Solder | Solder | Solder | Solder | Solder |
| Shell Material, Finish | Steel, Tin Plated | Steel, Tin Plated | Steel, Tin Plated | Steel, Tin-Nickel Plated | Steel, Tin-Nickel Plated | Steel, Tin Plated | Steel, Nickel Plated | Steel, Nickel Plated | Steel, Nickel Plated | Steel, Nickel Plated |
| Contact Finish | Gold | Gold | Gold | Gold | Gold | Gold | Gold | Gold | Gold | Gold |
| Current Rating (Amps) | 7.5A | 6A | 6A | 5A per Contact | 5A per Contact | 5A | 5A | 5A | 5A | 5A |
| Voltage Rating | 300V | Not Specified | Not Specified | 300V | 300V | Not Specified | Not Specified | Not Specified | Not Specified | Not Specified |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 105°C | -55°C ~ 105°C | -55°C ~ 125°C | -55°C ~ 125°C | -50°C ~ 100°C | -50°C ~ 100°C | -50°C ~ 100°C | -50°C ~ 100°C | -50°C ~ 100°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 |
| Product Status | Active | Active | Active | Active | Active | Obsolete | Active | Active | Active | Active |
| RoHS Status | RoHS Compliant | ROHS3 Compliant | RoHS Compliant | RoHS Compliant | RoHS Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Equivalents (Identical Mounting Configuration):
The TE Connectivity parts 2-338315-2 and 6-338315-2 provide direct functional equivalence with identical through-hole vertical solder mounting. Both are active products with ROHS3 compliance. The 2-338315-2 features M3 flange mounting, while 6-338315-2 provides 4-40 flange mounting. Operating temperature range extends to -55°C to 105°C, which covers the lower end of the L77DB25SOL2C309 specification but does not extend to 125°C. Current rating of 6A is lower than the primary part's 7.5A specification.
The Amphenol ICC (FCI) Delta D series parts D25S24A4GL00LF and D25S24A4GX00LF are active products with full parameter alignment. Both support the complete -55°C to 125°C operating range and 300V voltage rating. D25S24A4GL00LF provides M3 flange mounting, while D25S24A4GX00LF provides 4-40 flange mounting. Current rating is 5A per contact. Both are RoHS Compliant with REACH Unaffected status.
Alternative Mounting Configurations (Panel Mount):
NorComp Inc. 172-E series parts (172-E25-213R001, 172-E25-213R011, 172-E25-213R031, 172-E25-213R911) are active products suitable for applications requiring panel-mount through-hole configurations. All feature nickel-plated steel shells and are ROHS3 compliant. Operating temperature range is -50°C to 100°C, which does not extend to the full -55°C to 125°C specification of the primary part. Current rating is 5A. These parts accommodate different flange mounting options: unthreaded housing, board-side 4-40, mating-side 4-40, and board-lock configurations.
The NorComp 172-025-212R021 is obsolete and should not be selected for new designs despite parameter compatibility.
Selection Criteria:
For applications requiring full temperature range coverage (-55°C to 125°C) and 300V voltage rating, select D25S24A4GL00LF or D25S24A4GX00LF. For applications with reduced temperature requirements (-50°C to 100°C), NorComp 172-E series parts provide active product status with panel-mount flexibility. For TE Connectivity preference, 2-338315-2 or 6-338315-2 are active alternatives, noting the reduced upper temperature limit of 105°C.
Frequently Asked Questions (FAQ)
Q: Can the L77DB25SOL2C309 be directly replaced with a NorComp 172-E25 series connector?
A: NorComp 172-E25 series connectors are functionally compatible for 25-position D-Sub receptacle applications with solder termination. However, the operating temperature range differs: L77DB25SOL2C309 operates from -55°C to 125°C, while 172-E25 series operates from -50°C to 100°C. Selection depends on application temperature requirements. Additionally, 172-E series provides panel-mount configurations, whereas L77DB25SOL2C309 is through-hole vertical mount.
Q: What is the difference between D25S24A4GL00LF and D25S24A4GX00LF?
A: Both parts are Amphenol ICC (FCI) Delta D series 25-position D-Sub receptacles with identical electrical specifications. The primary difference is flange mounting: D25S24A4GL00LF features M3 flange mounting, while D25S24A4GX00LF features 4-40 flange mounting. Both support the full -55°C to 125°C operating range and 300V voltage rating.
Q: Why do some substitute parts have lower current ratings than the L77DB25SOL2C309?
A: The L77DB25SOL2C309 is rated at 7.5A, while many substitutes are rated at 5A or 6A per contact. Current rating depends on contact material, contact geometry, and thermal design. Parts with lower current ratings remain suitable for applications within their specified limits. Application current requirements must be verified against the selected substitute part's rating.
Q: Are all listed substitute parts RoHS compliant?
A: All active substitute parts listed are RoHS compliant. The L77DB25SOL2C309 is RoHS Compliant. TE Connectivity 2-338315-2 is ROHS3 Compliant. TE Connectivity 6-338315-2 is RoHS Compliant. Amphenol ICC (FCI) D25S24 series parts are RoHS Compliant. NorComp 172-E25 series parts are ROHS3 Compliant. The obsolete NorComp 172-025-212R021 is ROHS3 Compliant but should not be used in new designs.
Q: What is the significance of the flange feature differences (M3, 4-40, Board Side, Mating Side)?
A: Flange features determine the mechanical mounting interface. M3 and 4-40 refer to threaded mounting hole sizes. Board Side indicates mounting holes on the connector's board-facing surface. Mating Side indicates mounting holes on the connector's mating surface. Housing/Shell (Unthreaded) indicates no threaded mounting holes. Selection depends on the specific board layout and mechanical assembly requirements of the application.
Q: Can L77DB25SOL2C309 be used in applications requiring panel-mount configuration?
A: The L77DB25SOL2C309 is designed for through-hole vertical solder mounting and does not provide panel-mount flange features. For panel-mount applications, select NorComp 172-E25 series parts or TE Connectivity 6-338315-2, which provide panel-mount through-hole configurations with appropriate flange mounting options.
Q: What is the difference between tin-plated and nickel-plated shell finishes?
A: Shell finish affects corrosion resistance and environmental durability. Tin-plated shells (L77DB25SOL2C309, TE Connectivity parts) provide standard corrosion protection. Nickel-plated shells (NorComp 172-E25 series) provide enhanced corrosion resistance, particularly in harsh or humid environments. Selection depends on application environment and durability requirements.
Q: Are there inventory considerations when selecting substitute parts?
A: Yes. L77DB25SOL2C309 has 1099 units in stock. TE Connectivity 2-338315-2 has 1204 units. TE Connectivity 6-338315-2 has 1779 units. Amphenol ICC (FCI) D25S24A4GL00LF has 1351 units. Amphenol ICC (FCI) D25S24A4GX00LF has 1269 units. NorComp 172-E25-213R911 has 3289 units. Inventory availability may influence selection for high-volume applications or urgent requirements.
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