DBMF25S300 D-Sub 25 Position Receptacle Connector - Equivalent & Substitute Parts

Part Overview

The DBMF25S300 is a 25 position D-Sub receptacle connector manufactured by Amphenol ICC (FCI) in the DM HE501 series. This through-hole solder termination connector features female sockets with a DB shell size (3) and is designed for signal applications requiring 7.5A current capacity at 300V. The connector is currently active in production with 768 units in stock.

Substitute parts are necessary when the original DBMF25S300 becomes unavailable, when alternative RoHS compliance status is required, or when different packaging formats better suit manufacturing processes. The substitute parts listed maintain functional equivalence across core electrical and mechanical parameters while offering variations in shell finish, contact material, and regulatory compliance.

Key Parameters

Parameter	DBMF25S300 Specification
Connector Type	Receptacle, Female Sockets
Number of Positions	25
Number of Rows	2
Shell Size, Connector Layout	3 (DB, B)
Mounting Type	Through Hole
Termination	Solder
Current Rating	7.5A
Voltage Rating	300V
Operating Temperature Range	-55°C to 125°C
Material Flammability Rating	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following core parameters that must remain constant across all equivalent parts:

Connector type: Receptacle, Female Sockets
Position count: 25 positions in 2 rows
Shell size and layout: 3 (DB, B)
Mounting method: Through Hole
Termination method: Solder
Material flammability: UL94 V-0
Moisture sensitivity: MSL 1 (Unlimited)
ECCN and HTSUS codes: EAR99 and 8536.69.4040

Substitute parts may vary in the following parameters without affecting functional equivalence:

Shell material finish (Yellow Cadmium Plated vs. Tin Plated)
Contact material (Phosphor Bronze vs. Brass)
Contact finish thickness specifications
Dielectric material composition (Thermoplastic vs. Thermoplastic Glass Filled vs. Polyester)
Flange feature design (Unthreaded vs. 4-40 vs. M3)
Current rating (7.5A vs. 6A, where 6A is acceptable for lower-demand applications)
Voltage rating (300V vs. 125V, where 125V is acceptable for lower-voltage applications)
Operating temperature upper limit (-55°C to 125°C vs. -55°C to 105°C)
RoHS compliance status
Packaging format (Tray, Tube, or Bulk)
Manufacturer (Amphenol ICC vs. TE Connectivity)

Parameter Comparison

Parameter	DBMF25S300	L77DB25SU	1-338315-2	1-5745967-0	1-5745967-4	1-5745967-5	1-5745967-6	1-745967-4	2-338315-2	2-5747708-0	2-747708-0
Manufacturer	Amphenol ICC (FCI)	Amphenol ICC (Commercial)	TE Connectivity AMP	TE Connectivity AMP	TE Connectivity AMP	TE Connectivity AMP	TE Connectivity AMP	TE Connectivity AMP	TE Connectivity AMP	TE Connectivity AMP	TE Connectivity AMP
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
Positions / Rows	25 / 2	25 / 2	25 / 2	25 / 2	25 / 2	25 / 2	25 / 2	25 / 2	25 / 2	25 / 2	25 / 2
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	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Shell Material Finish	Steel, Yellow Cadmium Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin 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 Material	Phosphor Bronze	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Current Rating (Amps)	7.5A	7.5A	6A	6A	6A	6A	6A	6A	6A	6A	6A
Voltage Rating	300V	300V	—	125V	125V	125V	125V	125V	—	125V	125V
Operating Temperature	-55°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	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°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	Non-compliant	Compliant	ROHS3 Compliant	Compliant	Compliant	Compliant	ROHS3 Compliant	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	Non-compliant
Packaging	Tray	Tray	Tray	Tube	Tube	Tube	Tube	Tube	Bulk	Tray	Tube
Inventory (Pcs)	768	952	4711	1489	1879	2268	4421	1351	1204	4060	2038

Engineering Selection Recommendations

Direct Amphenol ICC Substitute (Highest Compatibility)

L77DB25SU is the closest functional equivalent, maintaining the same 7.5A current rating and 300V voltage specification as the DBMF25S300. Both parts share identical position count, shell size, and mounting configuration. The primary difference is shell finish (Tin Plated vs. Yellow Cadmium Plated) and contact material (Brass vs. Phosphor Bronze). L77DB25SU is RoHS Compliant and REACH Unaffected, making it suitable for applications requiring modern regulatory compliance. Packaging is Tray format with 952 units in stock.

TE Connectivity AMPLIMITE HD-20 Series (Reduced Current/Voltage Ratings)

Parts 1-5745967-0, 1-5745967-4, 1-5745967-5, 1-5745967-6, and 1-745967-4 are functionally equivalent for applications operating at or below 6A current and 125V voltage. These parts feature the same 25-position DB shell configuration and through-hole solder termination. All are RoHS Compliant except 1-745967-4 (RoHS non-compliant). Operating temperature is limited to -55°C to 105°C. Flange features vary between Housing/Shell (4-40) and Mating Side Female Screwlock (4-40). Tube packaging with inventory ranging from 1,351 to 4,421 units.

TE Connectivity AMPLIMITE HDP-20 Series with Board Lock (Mechanical Enhancement)

Parts 1-338315-2 and 2-338315-2 include Board Lock feature for enhanced mechanical retention. Both are rated at 6A with unspecified voltage rating. 1-338315-2 features Housing/Shell (4-40) flange in Tray packaging (4,711 units). 2-338315-2 features Housing/Shell (M3) flange in Bulk packaging (1,204 units). Both are ROHS3 Compliant.

TE Connectivity AMPLIMITE HD-20 Series with Board Lock (Alternative Flange)

Parts 2-5747708-0 and 2-747708-0 combine Board Lock feature with 6A current rating and 125V voltage specification. Both use Housing/Shell (4-40) flange. 2-5747708-0 is ROHS3 Compliant in Tray packaging (4,060 units). 2-747708-0 is RoHS non-compliant in Tube packaging (2,038 units).

Selection Criteria by Application Requirements:

For applications requiring the original 7.5A/300V specifications with modern compliance: Select L77DB25SU.

For applications operating at 6A or below and 125V or below with RoHS compliance requirement: Select any TE Connectivity AMPLIMITE HD-20 series part with ROHS3 Compliant status (1-5745967-6, 2-338315-2, or 2-5747708-0).

For applications requiring mechanical board lock feature: Select 1-338315-2, 2-338315-2, 2-5747708-0, or 2-747708-0.

For applications with legacy RoHS non-compliance acceptance: L77DB25SU, 1-745967-4, or 2-747708-0 are available.

Frequently Asked Questions (FAQ)

Q: Can L77DB25SU directly replace DBMF25S300 in all applications?

A: L77DB25SU maintains electrical equivalence (7.5A, 300V, 25 positions, DB shell size 3, through-hole solder termination, UL94 V-0). The primary differences are shell finish (Tin Plated vs. Yellow Cadmium Plated) and contact material (Brass vs. Phosphor Bronze). Compatibility depends on application-specific requirements for shell corrosion resistance and contact material properties. Both are functionally equivalent for standard signal applications.

Q: Why do TE Connectivity AMPLIMITE parts have lower current and voltage ratings?

A: The TE Connectivity AMPLIMITE HD-20 and HDP-20 series are rated at 6A and 125V, compared to DBMF25S300 at 7.5A and 300V. These are distinct product lines with different electrical specifications. Selection of these parts is appropriate only for applications operating within their rated parameters. Applications requiring 7.5A or 300V must use DBMF25S300 or L77DB25SU.

Q: What is the difference between Tube and Tray packaging?

A: Tube packaging contains connectors in a cylindrical container suitable for automated pick-and-place equipment. Tray packaging uses a flat tray format for manual handling or different assembly processes. Bulk packaging is loose quantity without individual packaging. Selection depends on manufacturing process requirements and assembly line compatibility.

Q: Are all substitute parts RoHS Compliant?

A: No. DBMF25S300 is RoHS non-compliant. L77DB25SU is RoHS Compliant. TE Connectivity parts vary: 1-5745967-0, 1-5745967-4, 1-5745967-5 are RoHS Compliant; 1-5745967-6 and 2-338315-2 are ROHS3 Compliant; 1-338315-2 is ROHS3 Compliant; 2-5747708-0 is ROHS3 Compliant; 1-745967-4 and 2-747708-0 are RoHS non-compliant. Applications subject to RoHS regulations must select compliant alternatives.

Q: What does Board Lock feature provide?

A: Board Lock is a mechanical retention feature that secures the connector to the PCB, preventing accidental disconnection during handling or vibration. Parts 1-338315-2, 2-338315-2, 2-5747708-0, and 2-747708-0 include this feature. Standard parts without Board Lock (1-5745967 series) rely on solder joint retention only.

Q: Can I use a 6A-rated part in a 7.5A application?

A: No. Current rating is a maximum specification. Using a 6A-rated connector in a 7.5A application exceeds the component's electrical capacity and creates risk of overheating and failure. Applications requiring 7.5A must use DBMF25S300 or L77DB25SU.

Q: What is the significance of operating temperature range differences?

A: DBMF25S300 and L77DB25SU operate from -55°C to 125°C. TE Connectivity AMPLIMITE parts operate from -55°C to 105°C. Applications requiring operation above 105°C must use DBMF25S300 or L77DB25SU. Applications operating within -55°C to 105°C range can use either specification.

Q: Are there mechanical compatibility issues between different flange types?

A: Flange features (Unthreaded, 4-40, M3) determine mounting method and PCB hole requirements. DBMF25S300 uses Unthreaded housing/shell. Substitute parts use 4-40 or M3 threaded flanges. PCB design must accommodate the selected flange type. Mechanical compatibility requires matching flange specification to PCB mounting holes.

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