DBMMG25SF D-Sub Receptacle Connector - Equivalent & Substitute Parts

Part Overview

The DBMMG25SF is a 25-position D-Sub receptacle connector manufactured by ITT Cannon, LLC, designed for panel mount, through-hole, right-angle solder termination applications. This connector features female sockets with a mating-side female screwlock and is classified as an active product with full inventory availability. Alternative equivalent parts may be required due to supply chain considerations, manufacturing discontinuation, or specific application compliance requirements.

Key Parameters

Parameter	Value
Connector Style	D-Sub
Connector Type	Receptacle, Female Sockets
Number of Positions	25
Number of Rows	2
Shell Size, Connector Layout	3 (DB, B)
Mounting Type	Panel Mount, Through Hole, Right Angle
Termination	Solder
Contact Type	Signal
Shell Material, Finish	Steel, Yellow Chromate Plated Zinc
Contact Finish	Gold, 50.0µin (1.27µm)
Current Rating	7.5A
Operating Temperature Range	-55°C ~ 150°C
RoHS Status	RoHS Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the DBMMG25SF is determined by strict alignment with the following core parameters:

Connector style and type: D-Sub receptacle with female sockets
Position count and row configuration: 25 positions in 2-row layout
Shell size and connector layout: Size 3 (DB, B)
Mounting configuration: Through-hole, right-angle orientation
Termination method: Solder
Contact finish specification: Gold plating at 50.0µin (1.27µm)

The substitute part 1218408-3 (TE Connectivity Aerospace, Defense and Marine) meets the core functional and mechanical requirements for D-Sub 25-position receptacle applications. Both parts conform to MIL-DTL-24308 specifications and share identical position counts, row configurations, shell sizes, and solder termination methods.

Parameter Comparison

Parameter	DBMMG25SF (ITT Cannon)	1218408-3 (TE Connectivity)	Compatibility Notes
Connector Style	D-Sub	D-Sub	Identical
Connector Type	Receptacle, Female Sockets	Receptacle, Female Sockets	Identical
Number of Positions	25	25	Identical
Number of Rows	2	2	Identical
Shell Size, Connector Layout	3 (DB, B)	3 (DB, B)	Identical
Mounting Type	Panel Mount, Through Hole, Right Angle	Through Hole, Right Angle	Both support through-hole, right-angle mounting
Termination	Solder	Solder	Identical
Contact Type	Signal	Signal	Identical
Shell Material, Finish	Steel, Yellow Chromate Plated Zinc	Steel, Cadmium Plated	Different finish specifications
Contact Finish	Gold, 50.0µin (1.27µm)	Gold, 50.0µin (1.27µm)	Identical
Current Rating	7.5A	5A	DBMMG25SF rated higher
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 125°C	DBMMG25SF supports higher maximum temperature
RoHS Status	RoHS Compliant	RoHS non-compliant	Different compliance status
Product Status	Active	Active	Both actively manufactured

Engineering Selection Recommendations

Selection between DBMMG25SF and 1218408-3 must account for the following compliance and performance factors:

DBMMG25SF (ITT Cannon, LLC) is the primary specification part. It provides RoHS compliance, a higher current rating of 7.5A, and an extended operating temperature range to 150°C. This part is suitable for applications requiring environmental compliance and higher thermal or current performance margins.

1218408-3 (TE Connectivity Aerospace, Defense and Marine) is a functional equivalent for applications where RoHS compliance is not mandated. This part is rated for 5A maximum current and operates to 125°C maximum. The cadmium-plated steel shell differs from the yellow chromate finish of the primary part. This substitute is appropriate for legacy systems, military applications, or environments where RoHS non-compliance is acceptable.

Both parts are active products with confirmed inventory availability and conform to MIL-DTL-24308 specifications for 25-position D-Sub receptacle connectors.

Frequently Asked Questions (FAQ)

Q: Can 1218408-3 be used as a direct replacement for DBMMG25SF in all applications?

A: 1218408-3 is mechanically and electrically compatible for standard D-Sub 25-position receptacle applications. However, applications requiring RoHS compliance, currents exceeding 5A, or operating temperatures above 125°C must use DBMMG25SF.

Q: What is the difference between the shell finishes?

A: DBMMG25SF uses yellow chromate-plated zinc, while 1218408-3 uses cadmium plating. Both provide corrosion protection; however, cadmium plating is subject to environmental restrictions in RoHS-regulated markets.

Q: Are the contact finishes identical?

A: Yes. Both parts specify gold plating at 50.0µin (1.27µm) thickness, ensuring equivalent electrical contact performance and mating durability.

Q: What is the significance of the current rating difference?

A: DBMMG25SF is rated for 7.5A, while 1218408-3 is rated for 5A. Applications requiring sustained currents above 5A must use DBMMG25SF to maintain safe operating margins.

Q: Are both parts suitable for solder termination?

A: Yes. Both DBMMG25SF and 1218408-3 are specified for solder termination and are compatible with standard PCB assembly processes.

Q: What is the operating temperature consideration?

A: DBMMG25SF operates from -55°C to 150°C, while 1218408-3 operates from -55°C to 125°C. Applications in high-temperature environments must use DBMMG25SF.

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