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L77DBG25ST - D-Sub Receptacle 25 Position Equivalent & Substitute Parts
Part Overview
The Amphenol ICC L77DBG25ST is a 25 Position D-Sub Receptacle connector with female sockets, rated for vertical through-hole mounting. The component is currently in Active product status with 1044 units available in inventory. This vertical solder-mounted receptacle serves as a primary interface component in applications requiring D-Sub connectivity. The identification of equivalent and substitute parts addresses design flexibility, supply chain continuity, and component availability across manufacturing timelines.
Substiute Parts
Key Parameters
| Parameter | L77DBG25ST Specification |
|---|---|
| Connector Type | Receptacle, Female Sockets |
| Number of Positions | 25 |
| Shell Size / Connector Layout | 3 (DB, B) |
| Mounting Type | Through Hole, Vertical |
| Termination | Solder |
| Shell Material / Finish | Steel, Tin Plated |
| Contact Finish | Gold |
| Contact Material | Brass |
| Flange Feature | Board Side (M3) |
| Current Rating | 7.5A |
| Voltage Rating | 300V |
| Operating Temperature Range | -55°C ~ 125°C |
| Material Flammability Rating | UL94 V-0 |
| RoHS Compliance | RoHS Compliant |
Substitute Part Grouping Explanation
Substitution for the L77DBG25ST is determined by strict adherence to the following key parameters:
- Connector Type: Must be Receptacle with Female Sockets
- Position Count & Layout: Must be 25 positions in 3 (DB, B) shell size configuration
- Mounting Method: Vertical Through Hole orientation required
- Termination: Solder termination only
- Flange Configuration: Board Side mounting (M3 or 4-40 hole patterns are permitted variants)
- Electrical Ratings: Current rating of 5A minimum, Voltage rating of 300V minimum
- Temperature Range: Operating range of -55°C to 100°C minimum (-55°C to 125°C preferred)
- Compliance: UL94 V-0 flammability rating, RoHS or ROHS3 compliance required
- Material Consistency: Steel shell with gold-plated or flash gold contact finish
Parts that deviate from these core parameters cannot serve as direct substitutes. Panel-mount variants and mating-side flange configurations are engineering variations excluded from equivalence due to fundamentally different mounting requirements.
Parameter Comparison
| Part Number | Manufacturer | Connector Type | Positions | Mounting Type | Shell Material / Finish | Contact Finish | Current Rating (A) | Voltage Rating (V) | Temp Range (°C) | Status | RoHS / ROHS3 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| L77DBG25ST | Amphenol ICC | Receptacle, Female | 25 | Through Hole, Vertical | Steel, Tin Plated | Gold | 7.5 | 300 | -55 ~ 125 | Active | RoHS Compliant |
| 2-338315-2 | TE Connectivity AMP | Receptacle, Female | 25 | Through Hole, Vertical | Steel, Tin Plated | Gold | 6 | — | -55 ~ 105 | Active | ROHS3 Compliant |
| 6-338315-2 | TE Connectivity AMP | Receptacle, Female | 25 | Through Hole, Vertical | Steel, Tin Plated | Gold | 6 | — | -55 ~ 105 | Active | RoHS Compliant |
| D25S24A4GL00LF | Amphenol ICC (FCI) | Receptacle, Female | 25 | Through Hole, Vertical | Steel, Tin-Nickel Plated | Gold | 5 | 300 | -55 ~ 125 | Active | RoHS Compliant |
| D25S24A4GX00LF | Amphenol ICC (FCI) | Receptacle, Female | 25 | Through Hole, Vertical | Steel, Tin-Nickel Plated | Gold | 5 | 300 | -55 ~ 125 | Active | RoHS Compliant |
| 172-025-212R011 | NorComp Inc. | Receptacle, Female | 25 | Panel / Through Hole | Steel, Tin Plated | Gold | 5 | — | -50 ~ 100 | Obsolete | ROHS3 Compliant |
| 172-025-212R021 | NorComp Inc. | Receptacle, Female | 25 | Panel / Through Hole | Steel, Tin Plated | Gold | 5 | — | -50 ~ 100 | Obsolete | ROHS3 Compliant |
| 172-E25-213R001 | NorComp Inc. | Receptacle, Female | 25 | Panel / Through Hole | Steel, Nickel Plated | Gold | 5 | — | -50 ~ 100 | Active | ROHS3 Compliant |
| 172-E25-213R011 | NorComp Inc. | Receptacle, Female | 25 | Panel / Through Hole | Steel, Nickel Plated | Gold | 5 | — | -50 ~ 100 | Active | ROHS3 Compliant |
| 172-E25-213R031 | NorComp Inc. | Receptacle, Female | 25 | Panel / Through Hole | Steel, Nickel Plated | Gold | 5 | — | -50 ~ 100 | Active | ROHS3 Compliant |
| 172-E25-213R911 | NorComp Inc. | Receptacle, Female | 25 | Panel / Through Hole | Steel, Nickel Plated | Gold | 5 | — | -50 ~ 100 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Vertical Through-Hole Substitutes (Highest Compatibility):
The D25S24A4GL00LF and D25S24A4GX00LF from Amphenol ICC (FCI Delta D series) are the primary equivalent components. Both are Active status products with identical mounting orientation (vertical through-hole), matching shell material finish (Tin-Nickel Plated), identical temperature operating range (-55°C to 125°C), and equivalent voltage rating (300V). The current rating of 5A per contact is within acceptable operating parameters for most applications rated at 7.5A nominal. RoHS compliance is confirmed for all three components.
Secondary Through-Hole Alternative:
The 2-338315-2 and 6-338315-2 from TE Connectivity AMP (AMPLIMITE HDP-20 series) provide vertical through-hole substitution. Both are Active status with tin-plated steel shells and gold-plated contacts. Operating temperature is -55°C to 105°C, representing a 20°C reduction in upper temperature limit compared to L77DBG25ST. Current rating is 6A. These components serve applications not requiring the full 125°C operating envelope.
Panel-Mount Alternatives (Engineering Variation):
The NorComp Inc. 172-025 series and 172-E25 series represent panel-mount configuration variants. These parts are structurally unsuitable for vertical through-hole board mounting applications. The 172-025-212R011 and 172-025-212R021 are Obsolete status and are not recommended for new designs. The 172-E25 series (213R001, 213R011, 213R031, 213R911) are Active status but share the same panel-mount limitation. Temperature range is restricted to -50°C to 100°C, narrower than the L77DBG25ST specification.
Design Phase Selection:
For active design implementation requiring vertical through-hole mounting, utilize D25S24A4GL00LF or D25S24A4GX00LF. For applications with temperature requirements below 105°C, TE Connectivity 2-338315-2 or 6-338315-2 represent acceptable alternatives. Panel-mount variants are excluded from consideration unless PCB layout requirements fundamentally change.
Frequently Asked Questions (FAQ)
Q: Can NorComp 172-E25-213R001 substitute for L77DBG25ST in a vertical through-hole application?
A: No. The 172-E25-213R001 is a panel-mount connector, whereas L77DBG25ST is a vertical through-hole component. Physical mounting orientation and flange configuration are fundamentally incompatible despite identical 25-position receptacle architecture.
Q: What is the significance of the flange feature differences (M3 vs. 4-40)?
A: Flange mounting hole patterns determine mechanical fastening points on the PCB or enclosure. M3 is a metric thread specification, while 4-40 is a unified thread specification. Both patterns represent board-side mounting variants. The Amphenol D25S24 series with M3 (D25S24A4GL00LF) and 4-40 (D25S24A4GX00LF) options are both compatible through-hole substitutes; flange selection depends on mechanical assembly requirements.
Q: Why is the current rating different between L77DBG25ST (7.5A) and substitute parts (5-6A)?
A: Current rating represents the maximum per-contact ampacity under specified thermal and electrical conditions. The L77DBG25ST specification of 7.5A is higher than most substitute options. For applications requiring continuous current near 7.5A per contact, L77DBG25ST is the appropriate selection. For applications operating at 5A or lower, substitutes D25S24A4GL00LF, D25S24A4GX00LF, and TE Connectivity options are electrically suitable.
Q: Are NorComp 172-025-212R011 and 172-025-212R021 acceptable substitutes despite Obsolete status?
A: These parts are classified as Obsolete, indicating discontinued production and declining supplier availability. Inventory exists (807 and 763 units respectively), but long-term supply is not assured. New designs must not incorporate Obsolete components. Existing legacy systems using these parts may source remaining inventory if substitution is infeasible, but active migration to Active status alternatives is the correct engineering approach.
Q: What is the impact of shell material finish variation (Tin Plated vs. Tin-Nickel Plated)?
A: Shell material finish affects corrosion resistance and environmental durability. Tin Plating (L77DBG25ST) provides basic corrosion protection suitable for standard industrial environments. Tin-Nickel Plating (D25S24A4GL00LF, D25S24A4GX00LF) provides enhanced corrosion resistance in more demanding environmental conditions. Both finishes are acceptable for standard application environments; selection is determined by specific operating environment requirements.
Q: Why do some parts lack a Voltage Rating specification?
A: Voltage rating information reflects manufacturer specification documentation. The absence of a stated voltage rating does not imply that the component is unsuitable for high-voltage applications; it indicates that manufacturer datasheets do not provide this parameter. For applications with voltage specifications exceeding 100V, L77DBG25ST (300V) or D25S24 series (300V) are preferred due to explicit 300V rating.
Q: Is MSL (Moisture Sensitivity Level) 1 critical for storage and handling?
A: MSL 1 (Unlimited shelf life) indicates no special moisture control requirements during storage or handling. All recommended substitutes carry MSL 1 or Not Applicable classifications, confirming compatibility with standard component storage practices.
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