DBM25S543 D-Sub Receptacle 25-Position Equivalent & Substitute Parts

Part Overview

The DBM25S543 is a 25-position D-Sub receptacle connector manufactured by Amphenol ICC (FCI) in the DM HE501 series. This through-hole, right-angle solder connector is designed for signal applications requiring harsh environment ingress protection with UL94 V-0 flammability rating. The part is currently active in production with 1037 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required, or when design specifications allow for compatible alternatives from different manufacturers that meet the same electrical and mechanical requirements.

Key Parameters

Parameter	DBM25S543 Specification
Connector Type	D-Sub Receptacle, Female Sockets
Number of Positions	25
Number of Rows	2
Shell Size / Layout	3 (DB, B)
Mounting Type	Through Hole, Right Angle
Termination	Solder
Shell Material / Finish	Steel, Yellow Cadmium Plated
Contact Finish	Gold
Current Rating	7.5A
Voltage Rating	300V
Operating Temperature Range	-55°C to 125°C
Flammability Rating	UL94 V-0
Backset Spacing	0.406" (10.30mm)
Contact Material	Phosphor Bronze
Ingress Protection	Harsh Environment
RoHS Status	RoHS non-compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution compatibility for the DBM25S543 is determined by the following critical parameters:

Connector Configuration: 25-position, 2-row D-Sub receptacle with female sockets
Shell Size and Layout: DB/B size (Shell Size 3)
Mounting Method: Through-hole, right-angle orientation
Termination Type: Solder connection
Electrical Performance: Current and voltage ratings must meet or exceed application requirements
Environmental Rating: UL94 V-0 flammability compliance
Operating Temperature: -55°C to 125°C range
Contact Material and Finish: Gold-plated contacts for signal integrity
Backset Spacing: 0.406" (10.30mm) standard spacing for PCB layout compatibility

Parts are grouped into three categories based on substitution viability:

Category A - Direct Electrical Equivalents (Current ≥ 6A, Voltage ≥ 125V, Operating Temperature ≥ -55°C to 105°C): 1-106507-2, 3-106507-2, 8-106507-2, 5745440-1, 5745440-4

Category B - Reduced Current Rating (Current 3A to 6.5A): 09663126603, 09663527613, L77SDB25S1ACH3R, L77SDB25SA4CH4F

Category C - Obsolete Status (Not recommended for new designs): 745440-1

Parameter Comparison

Part Number	Manufacturer	Positions	Rows	Shell Size	Mounting	Current (A)	Voltage (V)	Temp Range (°C)	Contact Finish	Backset (mm)	RoHS Status	Product Status
DBM25S543	Amphenol ICC (FCI)	25	2	3 (DB, B)	Through Hole, R/A	7.5	300	-55 to 125	Gold	10.30	Non-compliant	Active
09663126603	HARTING	25	2	3 (DB, B)	Through Hole, R/A	6.5	—	-55 to 125	—	10.40	ROHS3 Compliant	Active
09663527613	HARTING	25	2	3 (DB, B)	Through Hole, R/A	6.5	—	-55 to 125	—	10.40	ROHS3 Compliant	Active
1-106507-2	TE Connectivity AMP	25	2	3 (DB, B)	Panel Mount, Through Hole, R/A	6	125	-55 to 105	Gold	10.30	ROHS3 Compliant	Active
3-106507-2	TE Connectivity AMP	25	2	3 (DB, B)	Panel Mount, Through Hole, R/A	6	125	-55 to 105	Gold	10.30	ROHS3 Compliant	Active
8-106507-2	TE Connectivity AMP	25	2	3 (DB, B)	Panel Mount, Through Hole, R/A	6	125	-55 to 105	Gold	10.30	ROHS3 Compliant	Active
5745440-1	TE Connectivity AMP	25	2	3 (DB, B)	Through Hole, R/A	6	125	-55 to 105	Gold	11.53	RoHS Compliant	Active
5745440-4	TE Connectivity AMP	25	2	3 (DB, B)	Through Hole, R/A	6	125	-55 to 105	Gold	11.53	RoHS Compliant	Active
745440-1	TE Connectivity AMP	25	2	3 (DB, B)	Through Hole, R/A	6	125	-55 to 105	Gold	11.53	Non-compliant	Obsolete
L77SDB25S1ACH3R	Amphenol ICC (Commercial)	25	2	3 (DB, B)	Through Hole, R/A	3	250	-55 to 125	Gold	10.30	RoHS Compliant	Active
L77SDB25SA4CH4F	Amphenol ICC (Commercial)	25	2	3 (DB, B)	Through Hole, R/A	3	250	-55 to 125	Gold	8.08	RoHS Compliant	Active

Engineering Selection Recommendations

For applications requiring full electrical equivalence (7.5A current capacity and 300V rating): The DBM25S543 has no direct electrical equivalent among the listed substitutes. The highest current-rated alternatives are the HARTING parts (09663126603, 09663527613) at 6.5A and TE Connectivity parts at 6A, all with reduced voltage ratings of 125V or unspecified.

For RoHS compliance requirements: HARTING 09663126603 and 09663527613 are ROHS3 compliant. TE Connectivity 1-106507-2, 3-106507-2, and 8-106507-2 are ROHS3 compliant. Amphenol ICC L77SDB25S1ACH3R and L77SDB25SA4CH4F are RoHS compliant. The original DBM25S543 is RoHS non-compliant.

For temperature range preservation (-55°C to 125°C): HARTING 09663126603 and 09663527613, and Amphenol ICC L77SDB25S1ACH3R and L77SDB25SA4CH4F maintain the full temperature range. TE Connectivity parts are limited to -55°C to 105°C.

For active production status: All recommended substitutes except 745440-1 are active. The 745440-1 is obsolete and not recommended for new designs.

For backset spacing compatibility: Standard 0.406" (10.30mm) spacing is maintained by DBM25S543, 1-106507-2, 3-106507-2, 8-106507-2, L77SDB25S1ACH3R, and L77SDB25SA4CH4F. HARTING parts have 0.409" (10.40mm) spacing. TE Connectivity 5745440-1, 5745440-4, and 745440-1 have 0.454" (11.53mm) spacing, requiring PCB layout verification.

Frequently Asked Questions (FAQ)

Q: Can HARTING 09663126603 or 09663527613 directly replace DBM25S543?

A: These parts are mechanically and functionally compatible as 25-position D-Sub receptacles with identical shell size, mounting type, and termination. However, the current rating is reduced from 7.5A to 6.5A, and voltage rating is unspecified. Applications operating below 6.5A and not requiring the 300V rating can use these substitutes. HARTING parts are ROHS3 compliant, whereas DBM25S543 is not.

Q: What is the difference between TE Connectivity 1-106507-2, 3-106507-2, and 8-106507-2?

A: All three are from the AMPLIMITE HD-20 series with identical electrical specifications (6A, 125V, -55°C to 105°C). The primary difference is packaging: 1-106507-2 is supplied in trays, while 3-106507-2 and 8-106507-2 are supplied in bulk. All are ROHS3 compliant and active in production.

Q: Why do TE Connectivity 5745440-1 and 5745440-4 have different backset spacing?

A: Both parts have 0.454" (11.53mm) backset spacing, which differs from the DBM25S543 standard of 0.406" (10.30mm). This spacing difference requires verification against PCB layout requirements before substitution. Both parts include mounting brackets and are from the AMPLIMITE HDP-20 series.

Q: Are Amphenol ICC L77SDB25S1ACH3R and L77SDB25SA4CH4F suitable for high-current applications?

A: No. Both parts have a current rating of 3A, significantly lower than the DBM25S543 at 7.5A. These parts are suitable only for signal applications with current requirements below 3A. The L77SDB25SA4CH4F has reduced backset spacing of 0.318" (8.08mm) compared to standard 0.406" (10.30mm), requiring PCB layout compatibility verification.

Q: Should 745440-1 be used as a substitute?

A: No. The 745440-1 is marked as obsolete and RoHS non-compliant. While electrically similar to other TE Connectivity HDP-20 series parts, its obsolete status makes it unsuitable for new designs or long-term supply chain planning.

Q: What is the impact of different contact finish specifications?

A: DBM25S543 specifies gold contact finish without thickness specification. TE Connectivity parts specify 30.0µin (0.76µm) gold thickness. HARTING parts do not specify contact finish. Amphenol ICC L77SDB25S1ACH3R and L77SDB25SA4CH4F specify flash gold finish. For signal integrity in harsh environments, gold-plated contacts are preferred. Verify contact finish requirements against application specifications before substitution.

Q: How does packaging format affect substitution decisions?

A: DBM25S543 is supplied in trays. HARTING 09663126603 and 09663527613 are supplied in bulk. TE Connectivity 1-106507-2 is in trays; 3-106507-2 and 8-106507-2 are in bulk. Amphenol ICC L77SDB25S1ACH3R and L77SDB25SA4CH4F are in trays. Packaging format does not affect electrical or mechanical compatibility but may impact procurement, storage, and handling procedures.

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