DBM25P400 Equivalent & Substitute Parts

Part Overview

The DBM25P400 is a 25-position D-Sub plug connector manufactured by Amphenol ICC (FCI) designed for panel mount, through-hole applications with wire wrap termination. This connector features a male pin configuration with gold-plated brass contacts rated for 7.5A per contact at 300V, operating across a temperature range of -55°C to 125°C. The part is currently active in production status with RoHS non-compliant classification and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts become necessary when the primary part experiences supply constraints, obsolescence of related components in a system, or when design requirements permit alternative configurations that maintain electrical and mechanical compatibility.

Substiute Parts

DBM25P400

Amphenol ICC (FCI)In Stock: 1130DBM25P400 Datasheet

Current PartRFQ

172-025-142R021

NorComp Inc.In Stock: 1153172-025-142R021 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DBM25P400 is determined by strict equivalence across the following critical parameters:

Connector configuration parameters: 25-position count, 2-row arrangement, and DB/B shell size (3) are non-negotiable for mechanical and electrical compatibility with mating receptacles.

Termination method: Wire wrap termination is required for compatibility with existing assembly processes and PCB layouts.

Electrical performance: Current rating and voltage rating establish the maximum operational envelope. The substitute part 172-025-142R021 operates at 5A per contact, which is lower than the 7.5A rating of the main part. This represents a derating condition and restricts the substitute to applications where current demand does not exceed 5A per contact.

Temperature operating range: The main part operates from -55°C to 125°C. The substitute part operates from -50°C to 100°C, representing a narrower range that excludes extreme low-temperature and high-temperature applications.

Contact and shell materials: Both parts use brass contacts with gold finish and steel shells, ensuring electrical compatibility and corrosion resistance.

Flammability compliance: Both parts meet UL94 V-0 rating, maintaining fire safety standards.

Parameter Comparison

Engineering Selection Recommendations

The DBM25P400 remains the primary selection for new designs and applications requiring the full operational envelope of 7.5A per contact, 300V rating, and -55°C to 125°C temperature range.

The substitute part 172-025-142R021 is classified as obsolete and should not be selected for new production designs. Its use is limited to legacy system maintenance or repair applications where the original connector type must be matched. The reduced current rating of 5A per contact and narrower operating temperature range (-50°C to 100°C) restrict its application scope.

For applications operating within the substitute part's electrical and thermal limits (≤5A per contact, ≤100°C maximum temperature), the 172-025-142R021 provides mechanical and functional compatibility. However, the obsolete status and RoHS3 compliance (versus RoHS non-compliant main part) may introduce supply chain and regulatory considerations.

The difference in shell finish (yellow cadmium plated versus tin plated) and dielectric material composition (thermoplastic versus PBT/polyester) are secondary considerations when primary electrical parameters are satisfied.

Frequently Asked Questions (FAQ)

Q: Can the 172-025-142R021 be used as a direct replacement for the DBM25P400 in all applications?

A: No. The substitute part has a reduced current rating (5A versus 7.5A per contact) and narrower operating temperature range (-50°C to 100°C versus -55°C to 125°C). It is compatible only in applications that operate within these reduced limits.

Q: What is the significance of the obsolete status of the 172-025-142R021?

A: Obsolete status indicates the part is no longer manufactured or supported by NorComp Inc. It should not be specified for new designs. Existing inventory may be available through secondary distributors, but long-term supply cannot be assured.

Q: Are the shell finishes (yellow cadmium plated versus tin plated) functionally equivalent?

A: Both finishes provide corrosion protection and electrical conductivity. Yellow cadmium plating offers superior corrosion resistance in harsh environments, while tin plating is more environmentally compliant. For standard indoor applications, both are functionally equivalent.

Q: Does the difference in dielectric material (thermoplastic versus PBT/polyester) affect compatibility?

A: Both materials are thermoplastic polymers meeting UL94 V-0 flammability requirements. The difference does not affect mechanical fit or electrical performance in standard applications. Material selection may be relevant only in specialized thermal or chemical environments.

Q: What is the significance of the RoHS compliance difference?

A: The DBM25P400 is RoHS non-compliant, while the 172-025-142R021 is ROHS3 compliant. For applications subject to RoHS regulations, the substitute part offers compliance advantage. For non-regulated applications, this difference is not relevant to connector function.

Q: Can the 172-025-142R021 be used in high-current applications?

A: No. The 5A per contact rating of the 172-025-142R021 limits its use to applications where individual contact current does not exceed 5A. Applications requiring the full 7.5A rating of the DBM25P400 must use the main part or identify alternative substitutes with equivalent current ratings.

Q: Are there other substitute parts available for the DBM25P400?

A: The provided data identifies 172-025-142R021 as the manufacturer-recommended substitute. Additional equivalents may exist from other manufacturers, but they are not included in this reference.