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L77DB25PT 25 Position D-Sub Plug Equivalent & Substitute Parts
Part Overview
The L77DB25PT is a 25 position D-Sub plug connector manufactured by Amphenol ICC (Commercial Products) with male pins, vertical solder termination, and through-hole mounting. This connector is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring compatible alternatives.
The L77DB25PT operates within a temperature range of -55°C to 125°C with a 7.5A current rating and 300V voltage rating. Its steel tin-plated shell with gold-plated contacts and UL94 V-0 flammability rating makes it suitable for industrial and commercial applications requiring reliable signal connectivity.
Substiute Parts
Key Parameters
| Parameter | L77DB25PT Specification |
|---|---|
| Connector Type | D-Sub Plug, Male Pins |
| Number of Positions | 25 |
| Shell Size / Layout | 3 (DB, B) |
| Mounting Type | Through Hole |
| Termination | Solder |
| Shell Material / Finish | Steel, Tin Plated |
| Contact Finish | Gold (8.00µin / 0.203µm) |
| Current Rating | 7.5A |
| Voltage Rating | 300V |
| Operating Temperature | -55°C to 125°C |
| Flammability Rating | UL94 V-0 |
| RoHS Status | RoHS Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the L77DB25PT is determined by strict equivalence across the following critical parameters:
- Connector type: D-Sub plug with male pins
- Position count: 25 positions in 2-row configuration
- Shell size and layout: 3 (DB, B)
- Mounting method: Through hole
- Termination method: Solder
- Flange feature: Housing/shell configuration
- Electrical ratings: Current and voltage capacity
- Operating temperature range compatibility
- Material and finish specifications
- Contact form and material composition
Substitute parts are grouped into two categories: manufacturer-recommended direct replacements and similar alternatives from other manufacturers. Direct replacements maintain identical or superior electrical and mechanical specifications. Similar alternatives may have minor variations in contact finish thickness, dielectric material, or flange features but remain functionally compatible within the defined parameter set.
Parameter Comparison
| Parameter | L77DB25PT | L717DB25PT | 09643227240 | 09653617713 | 1-5745968-3 | 1-5745968-4 | 1-5745968-5 | 1-5745968-6 | 1-745968-4 | 172-025-112R001 | 172-E25-113R911 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Amphenol ICC | Amphenol ICC | HARTING | HARTING | TE Connectivity | TE Connectivity | TE Connectivity | TE Connectivity | TE Connectivity | NorComp Inc. | NorComp Inc. |
| Connector Type | Plug, Male Pins | Plug, Male Pins | Plug, Male Pins | Plug, Male Pins | Plug, Male Pins | Plug, Male Pins | Plug, Male Pins | Plug, Male Pins | Plug, Male Pins | Plug, Male Pins | Plug, Male Pins |
| Positions | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| 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) | 3 (DB, B) |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Panel Mount, Through Hole | Panel Mount, Through Hole |
| Termination | Solder | Solder | Solder | Solder | Solder | Solder | Solder | Solder | Solder | Solder | Solder |
| Shell Material | Steel, Tin Plated | Steel, Tin Plated | Steel | Steel | Steel, Tin Plated | Steel, Tin Plated | Steel, Tin Plated | Steel, Tin Plated | Steel, Tin Plated | Steel, Tin Plated | Steel, Nickel Plated |
| Contact Finish | Gold | Gold | Not Specified | Not Specified | Gold | Gold | Gold | Gold | Gold | Gold | Gold |
| Current Rating (A) | 7.5 | 7.5 | 7.5 | 6.5 | 6 | 6 | 6 | 6 | 6 | 5 | 5 |
| Voltage Rating (V) | 300 | 300 | 100 | Not Specified | 125 | 125 | 125 | 125 | 125 | Not Specified | Not Specified |
| Operating Temperature | -55°C to 125°C | -55°C to 125°C | -20°C to 125°C | -55°C to 125°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 | -50°C to 100°C | -50°C to 100°C |
| 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 | RoHS Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | RoHS Compliant | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Obsolete | Active |
Engineering Selection Recommendations
Primary Recommendation: L717DB25PT
The L717DB25PT is the manufacturer-recommended direct replacement for the L77DB25PT. Both parts are manufactured by Amphenol ICC (Commercial Products) and maintain identical electrical and mechanical specifications: 25 positions, 3 (DB, B) shell size, 7.5A current rating, 300V voltage rating, and -55°C to 125°C operating temperature range. The L717DB25PT is currently in active production status with RoHS compliance, providing supply continuity and regulatory alignment for new designs.
Secondary Recommendations: TE Connectivity AMPLIMITE HD-20 Series
The TE Connectivity parts 1-5745968-3, 1-5745968-4, 1-5745968-5, 1-5745968-6, and 1-745968-4 provide functional alternatives with compatible 25-position D-Sub plug configuration and through-hole solder termination. These parts operate within -55°C to 105°C temperature range with 6A current rating and 125V voltage rating. All AMPLIMITE HD-20 variants maintain UL94 V-0 flammability rating and RoHS compliance status (except 1-745968-4, which is RoHS non-compliant). The reduced current and voltage ratings require verification against application requirements.
Alternative Consideration: HARTING 09643227240
The HARTING 09643227240 maintains 25-position D-Sub plug configuration with 7.5A current rating and UL94 V-0 rating. Operating temperature range is -20°C to 125°C, which is narrower at the low end compared to the L77DB25PT. Voltage rating is 100V, requiring verification for applications exceeding this specification. ROHS3 compliance is confirmed.
Panel Mount Alternatives: NorComp 172 Series
The NorComp 172-025-112R001 and 172-E25-113R911 provide panel mount through-hole configurations with 25-position D-Sub plug connectivity. Current ratings are reduced to 5A, and operating temperature ranges are -50°C to 100°C. These parts are suitable for applications with lower current requirements and panel-mounted installation requirements. The 172-E25-113R911 is currently active with ROHS3 compliance.
Frequently Asked Questions (FAQ)
Q: Can L717DB25PT directly replace L77DB25PT without design modification?
A: Yes. The L717DB25PT is the manufacturer-recommended direct replacement with identical electrical ratings (7.5A, 300V), operating temperature range (-55°C to 125°C), shell size (3 DB, B), and solder termination. Both maintain UL94 V-0 flammability rating and RoHS compliance. No design modification is required.
Q: What are the key differences between L77DB25PT and TE Connectivity AMPLIMITE HD-20 alternatives?
A: The primary differences are current rating (6A versus 7.5A), voltage rating (125V versus 300V), and maximum operating temperature (105°C versus 125°C). The AMPLIMITE HD-20 series includes female screwlock mating features on the mating side, whereas the L77DB25PT has unthreaded housing. Applications requiring the full 7.5A current or 300V voltage rating must use L717DB25PT or HARTING 09643227240.
Q: Are HARTING 09643227240 and 09653617713 suitable replacements?
A: HARTING 09643227240 is suitable for applications operating at 100V or below with 7.5A current requirement and -20°C to 125°C temperature range. HARTING 09653617713 has reduced current rating (6.5A) and includes board lock and female screwlock features not present in the original L77DB25PT. Both require verification against specific application voltage and current requirements.
Q: What is the impact of panel mount versus through-hole mounting on substitution?
A: NorComp 172 series parts include panel mount capability in addition to through-hole mounting. If the application requires only through-hole mounting without panel mount features, this difference does not affect functionality. However, current ratings are reduced to 5A, requiring verification against application requirements.
Q: Which substitute parts maintain full RoHS3 compliance?
A: L717DB25PT, HARTING 09643227240, HARTING 09653617713, TE Connectivity 1-5745968-3, 1-5745968-4, 1-5745968-5, NorComp 172-025-112R001, and NorComp 172-E25-113R911 all maintain ROHS3 compliance. TE Connectivity 1-5745968-6 maintains RoHS compliance. TE Connectivity 1-745968-4 is RoHS non-compliant and should not be used in applications requiring RoHS certification.
Q: Can parts with lower current ratings (5A or 6A) be used in applications designed for 7.5A?
A: No. Using parts with lower current ratings in applications designed for 7.5A operation creates risk of connector overheating and failure. Applications requiring 7.5A current must use L717DB25PT or HARTING 09643227240.
Q: What packaging options are available for these substitute parts?
A: L717DB25PT is supplied in tray packaging. HARTING parts are supplied in bulk packaging. TE Connectivity AMPLIMITE HD-20 series (1-5745968-3 through 1-5745968-6) are supplied in tube packaging. TE Connectivity 1-745968-4 is supplied in bulk packaging. NorComp 172 series parts are supplied in tray packaging. Packaging selection may affect procurement lead times and handling requirements.
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