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DBMF25S D-Sub 25 Position Receptacle Connector Equivalent & Substitute Parts
Part Overview
The DBMF25S is a 25 position D-Sub receptacle connector manufactured by Amphenol ICC (FCI) in the DM HE501 series. This free hanging, in-line connector features female sockets with solder cup termination and is designed for signal applications requiring 7.5A current capacity at 300V. The part is currently active in production with 704 units in stock.
Substitute parts are necessary when the original DBMF25S becomes unavailable, when design requirements shift toward panel mount configurations, or when RoHS3 compliance is mandated for new applications. The substitute parts listed maintain core electrical and mechanical compatibility while offering alternative mounting styles and material specifications.
Substiute Parts
Key Parameters
| Parameter | DBMF25S Specification |
|---|---|
| Connector Type | Receptacle, Female Sockets |
| Number of Positions | 25 |
| Shell Size / Layout | 3 (DB, B) |
| Mounting Type | Free Hanging (In-Line) |
| Termination | Solder Cup |
| Current Rating | 7.5A |
| Voltage Rating | 300V |
| Operating Temperature | -55°C to 125°C |
| Shell Material / Finish | Steel, Yellow Cadmium Plated |
| Contact Finish | Gold |
| Flange Feature | Housing/Shell (Unthreaded) |
| Dielectric Material | Thermoplastic |
| Material Flammability | UL94 V-0 |
| RoHS Status | RoHS non-compliant |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitution eligibility for the DBMF25S is determined by the following mandatory parameters:
Core Compatibility Parameters:
- Connector type: Receptacle, Female Sockets
- Number of positions: 25
- Shell size and layout: 3 (DB, B)
- Termination method: Solder Cup
- Contact finish: Gold
- Material flammability: UL94 V-0
Allowed Variations:
- Mounting type: Panel mount substitutes are acceptable as they maintain the same connector interface and pin configuration
- Shell material finish: Tin plated, nickel plated, or yellow cadmium plated are interchangeable for signal applications
- Dielectric material: Thermoplastic, PBT, or PBT glass-filled are acceptable alternatives
- Current rating: Substitutes rated at 5A are acceptable for applications not requiring the full 7.5A capacity of the original
- Operating temperature: Substitutes with -50°C to 100°C range are acceptable for most applications; the original -55°C to 125°C range provides extended capability
- RoHS compliance: RoHS3 compliant substitutes are preferred for new designs and regulatory requirements
Non-Substitutable Parameters:
- Connector style, type, and position count
- Shell size and layout
- Solder cup termination
- Gold contact finish
- UL94 V-0 flammability rating
Parameter Comparison
| Parameter | DBMF25S (Amphenol ICC) | 171-025-202L001 (NorComp) | 171-025-202L011 (NorComp) | 171-025-203L001 (NorComp) | 171-025-203L011 (NorComp) | 171-025-203L021 (NorComp) | 171-025-203L031 (NorComp) | 172-025-202R001 (NorComp) | 172-025-202R011 (NorComp) | 172-E25-202R001 (NorComp) | 172-E25-202R031 (NorComp) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 / 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 | Free Hanging (In-Line) | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount |
| Termination | Solder Cup | Solder Cup | Solder Cup | Solder Cup | Solder Cup | Solder Cup | Solder Cup | Solder Cup | Solder Cup | Solder Cup | Solder Cup |
| Current Rating (Amps) | 7.5A | 5A | 5A | 5A | 5A | 5A | 5A | 5A | 5A | 5A | 5A |
| Voltage Rating | 300V | — | — | — | — | — | — | — | — | — | — |
| Operating Temperature | -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 | -50°C to 100°C | -50°C to 100°C | -50°C to 100°C | -50°C to 100°C | -50°C to 100°C | -50°C to 100°C |
| Shell Material / Finish | Steel, Yellow Cadmium Plated | Steel, Tin Plated | Steel, Tin Plated | Steel, Nickel Plated | Steel, Nickel Plated | Steel, Nickel Plated | Steel, Nickel Plated | Steel, Tin Plated | Steel, Tin Plated | Steel, Tin Plated | Steel, Tin Plated |
| Contact Finish | Gold | Gold | Gold | Gold | Gold | Gold | Gold | Gold | Gold | Gold | Gold |
| Contact Finish Thickness | — | Flash | Flash | Flash | Flash | Flash | Flash | Flash | Flash | Flash | Flash |
| Material Flammability | 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 |
| Dielectric Material | Thermoplastic | Polybutylene Terephthalate (PBT) | Polybutylene Terephthalate (PBT) | Polybutylene Terephthalate (PBT), Glass Filled | Polybutylene Terephthalate (PBT), Glass Filled | Polybutylene Terephthalate (PBT), Glass Filled | Polybutylene Terephthalate (PBT), Glass Filled | Polybutylene Terephthalate (PBT), Glass Filled | Polybutylene Terephthalate (PBT), Glass Filled | Polybutylene Terephthalate (PBT) | Polybutylene Terephthalate (PBT) |
| Flange Feature | Housing/Shell (Unthreaded) | Housing/Shell (Unthreaded) | Cable Side (4-40) | Housing/Shell (Unthreaded) | Cable Side (4-40) | Cable Side (4-40) | Mating Side (4-40) | Housing/Shell (Unthreaded) | Cable Side (4-40) | Housing/Shell (Unthreaded) | Mating Side (4-40) |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Obsolete | Obsolete | Active | Active | Active | Active | Obsolete | Obsolete | Obsolete | Obsolete |
Engineering Selection Recommendations
For Direct Replacement (Free Hanging, In-Line Mounting):
The DBMF25S has no direct equivalent among the listed substitutes, as all alternatives are panel mount configurations. If free hanging, in-line mounting is required, the original DBMF25S remains the only option from this list.
For Panel Mount Applications:
When transitioning to panel mount designs, the NorComp 171 series (171-025-202L001, 171-025-202L011, 171-025-203L001, 171-025-203L011, 171-025-203L021, 171-025-203L031) and 172 series (172-025-202R001, 172-025-202R011, 172-E25-202R001, 172-E25-202R031) are electrically compatible substitutes. All maintain the 25 position, DB shell size, solder cup termination, and gold contact finish.
For RoHS3 Compliance:
All listed NorComp substitutes are ROHS3 compliant, whereas the DBMF25S is RoHS non-compliant. For new designs or applications requiring RoHS3 certification, select from the active status parts: 171-025-203L001, 171-025-203L011, 171-025-203L021, or 171-025-203L031. These offer the most current product status and regulatory compliance.
For Extended Temperature Range:
The DBMF25S operates from -55°C to 125°C. All listed substitutes operate from -50°C to 100°C, providing a narrower range. Applications requiring the full -55°C to 125°C capability must retain the DBMF25S.
For Current Capacity:
The DBMF25S is rated at 7.5A, while all listed substitutes are rated at 5A. Applications requiring current capacity above 5A must use the DBMF25S.
Preferred Active Substitutes (Panel Mount):
For new designs requiring panel mount configuration and RoHS3 compliance, 171-025-203L001 and 171-025-203L031 are recommended. Both are active products with high inventory availability (3692 and 1090 units respectively), nickel plated steel shells, and glass-filled PBT dielectric material.
Frequently Asked Questions (FAQ)
Q: Can I use a panel mount substitute in place of the free hanging DBMF25S?
A: No. The DBMF25S is designed for free hanging, in-line mounting. Panel mount substitutes have different mechanical interfaces and cannot be directly substituted without redesigning the mounting structure. The connector interface and pin configuration remain identical, but the physical mounting method is fundamentally different.
Q: What is the difference between the 171 and 172 series substitutes?
A: The 171 series uses stamped contacts with PBT or glass-filled PBT dielectric material. The 172 series uses machined contacts with brass material and glass-filled PBT dielectric. Both are electrically compatible with the DBMF25S. The 172 series offers machined contacts for potentially improved contact reliability, while the 171 series provides a more economical alternative.
Q: Why do the substitutes have a lower current rating (5A vs. 7.5A)?
A: The DBMF25S is rated for 7.5A due to its specific contact design and materials. The NorComp substitutes are rated at 5A based on their contact geometry and material specifications. For applications requiring current capacity above 5A, the DBMF25S must be retained.
Q: Are all substitutes RoHS3 compliant?
A: Yes. All listed NorComp substitutes are ROHS3 compliant. The original DBMF25S is RoHS non-compliant. For applications requiring RoHS3 certification, any of the listed substitutes are acceptable from a compliance standpoint.
Q: What is the difference between flange features (Housing/Shell, Cable Side, Mating Side)?
A: Flange feature refers to the mounting interface location. Housing/Shell (Unthreaded) provides an unthreaded mounting surface on the connector body. Cable Side (4-40) provides a threaded mounting point on the cable-facing side. Mating Side (4-40) provides a threaded mounting point on the mating side. Selection depends on the specific panel mount configuration and mechanical design requirements.
Q: Can I substitute a tin-plated shell for the yellow cadmium-plated shell?
A: Yes. For signal applications, tin-plated and nickel-plated shells are acceptable alternatives to yellow cadmium plating. All three finishes provide adequate corrosion protection and electrical performance for D-Sub connectors in standard environments. Material finish selection may be driven by environmental requirements or specific application standards.
Q: What is the difference between flash gold and standard gold plating?
A: Flash gold refers to a thin gold plating layer applied over a base metal. This provides the corrosion resistance and contact performance benefits of gold while minimizing material cost. Flash gold is suitable for signal applications and is standard for D-Sub connectors. The DBMF25S does not specify contact finish thickness, while all substitutes specify flash gold.
Q: Are the operating temperature ranges interchangeable?
A: The DBMF25S operates from -55°C to 125°C, while all substitutes operate from -50°C to 100°C. The substitutes have a narrower range. For applications operating below -50°C or above 100°C, the DBMF25S must be retained. For applications within the -50°C to 100°C range, substitutes are acceptable.
Q: Which substitute should I choose for a new design?
A: For new designs requiring panel mount configuration, RoHS3 compliance, and active product status, select 171-025-203L001 or 171-025-203L031. Both are currently active, have high inventory availability, and meet modern regulatory requirements. The choice between them depends on the specific flange feature required by your mechanical design (Housing/Shell unthreaded vs. Mating Side 4-40).
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