L77TSBG25SOL2 D-Sub 25 Position Receptacle Equivalent & Substitute Parts

Part Overview

The L77TSBG25SOL2 is a 25 Position D-Sub Receptacle connector manufactured by Amphenol ICC (Commercial Products). This through-hole solder termination connector features female sockets in a vertical orientation with a DB/B shell size (Size 3) configuration. The connector is classified as Active product status with full RoHS compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent D-Sub 25 position receptacle connectors share the same core electrical and mechanical specifications: 25 positions, 2-row configuration, DB/B shell size, through-hole mounting, solder termination, and female socket contact type. Alternative models become necessary when original inventory is unavailable, when specific flange features or contact finishes are required for application constraints, or when alternative manufacturers offer equivalent performance characteristics within the same electrical ratings.

Key Parameters

Parameter	L77TSBG25SOL2 Value	Substitution Relevance
Connector Type	Receptacle, Female Sockets	Critical - Must match for mating compatibility
Number of Positions	25	Critical - Determines pin count and shell size
Shell Size, Connector Layout	3 (DB, B)	Critical - Physical and electrical interface standard
Mounting Type	Through Hole	Critical - PCB assembly method
Termination	Solder	Critical - Connection method to PCB
Number of Rows	2	Critical - Pin arrangement configuration
Current Rating (Amps)	5A	Important - Electrical load capacity
Voltage Rating	600V	Important - Maximum operating voltage
Operating Temperature	-55°C ~ 125°C	Important - Environmental operating range
Material Flammability Rating	UL94 V-0	Important - Safety compliance standard
RoHS Status	RoHS Compliant	Important - Regulatory compliance
Flange Feature	Board Side (M3)	Secondary - Mechanical mounting variation
Contact Finish	Gold	Secondary - Contact surface treatment
Shell Material, Finish	Steel, Tin Plated	Secondary - Housing material and protection

Substitute Part Grouping Explanation

Substitution logic for the L77TSBG25SOL2 is based on strict equivalence of critical parameters that define functional compatibility:

Critical Parameters (Must Match):

Connector Type: Receptacle, Female Sockets
Number of Positions: 25
Shell Size, Connector Layout: 3 (DB, B)
Mounting Type: Through Hole
Termination: Solder
Number of Rows: 2

Important Parameters (Should Match or Exceed):

Current Rating: Substitute must support minimum 5A
Voltage Rating: Substitute must support minimum 600V (or no voltage limit specified)
Operating Temperature: Substitute must cover -55°C to 125°C range
Material Flammability Rating: UL94 V-0 required

Secondary Parameters (Acceptable Variation):

Flange Feature: Board Side (M3), Housing/Shell (Unthreaded), or Mating Side variations
Contact Finish: Gold, or alternative finishes
Shell Material/Finish: Steel with various plating options
Contact Form: Stamped or Machined
Dielectric Material: Various thermoplastic compositions

Substitute parts are grouped by manufacturer and flange feature configuration. Parts meeting all critical parameters and important electrical ratings are classified as direct substitutes. Parts with secondary parameter variations are classified as functional equivalents with specific application considerations.

Parameter Comparison

Parameter	L77TSBG25SOL2	09643127210	09663556513	1-745967-4	172-E25-213R011
Manufacturer	Amphenol ICC	HARTING	HARTING	TE Connectivity	NorComp Inc.
Connector Type	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets
Number of Positions	25	25	25	25	25
Shell Size	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)
Number of Rows	2	2	2	2	2
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Panel Mount, Through Hole
Termination	Solder	Solder	Solder	Solder	Solder
Current Rating (Amps)	5A	7.5A	6.5A	6A	5A
Voltage Rating	600V	100V	Not Specified	125V	Not Specified
Operating Temperature	-55°C ~ 125°C	-20°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 105°C	-50°C ~ 100°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Contact Finish	Gold (Flash)	Not Specified	Gold	Gold (30.0µin)	Gold (Flash)
Shell Material, Finish	Steel, Tin Plated	Steel	Steel	Steel, Tin Plated	Steel, Nickel Plated
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active
Inventory (Pcs)	951	694	750	1351	1042

Engineering Selection Recommendations

Direct Substitutes (Recommended Priority Order):

09663556513 (HARTING) - Highest compatibility. Matches critical parameters with 6.5A current rating, -55°C to 125°C operating range, gold contact finish, and ROHS3 compliance. Flange feature is Mating Side Female Screwlock (4-40) with Board Lock feature. Inventory: 750 pcs.
09643127210 (HARTING) - Meets critical parameters with 7.5A current rating and ROHS3 compliance. Operating temperature limited to -20°C (vs. -55°C on main part). Voltage rating 100V (vs. 600V on main part). Flange feature is Housing/Shell (Unthreaded) with Filter feature. Inventory: 694 pcs.
172-E25-213R011 (NorComp Inc.) - Meets critical parameters with 5A current rating and ROHS3 compliance. Panel Mount capability adds flexibility. Operating temperature limited to -50°C to 100°C. Flange feature is Board Side (4-40). Inventory: 1042 pcs.

Conditional Substitutes:

1-745967-4 (TE Connectivity) - Meets critical parameters with 6A current rating and UL94 V-0 rating. RoHS non-compliant status requires regulatory review. Operating temperature limited to -55°C to 105°C. Highest inventory availability: 1351 pcs. Suitable only for applications without RoHS requirements.

Not Recommended:

09643127230, 09643127240, 09663517513 - These HARTING variants share the same parameter limitations as 09643127210 (100V voltage rating, -20°C minimum operating temperature). Included in substitute list but not prioritized for selection.

Selection Criteria:

For RoHS-compliant applications requiring full -55°C to 125°C range: Select 09663556513
For applications with relaxed temperature requirements (-20°C minimum acceptable): Select 09643127210
For panel-mount applications: Select 172-E25-213R011
For non-RoHS applications with highest inventory: Select 1-745967-4

All recommended substitutes maintain UL94 V-0 flammability rating, through-hole solder termination, and 25-position DB/B shell configuration.

Frequently Asked Questions (FAQ)

Q: Can I use 09643127210 as a direct replacement for L77TSBG25SOL2?

A: 09643127210 is functionally equivalent for most applications but has two parameter limitations: voltage rating of 100V (vs. 600V on L77TSBG25SOL2) and minimum operating temperature of -20°C (vs. -55°C on L77TSBG25SOL2). Use only if your application operates above -20°C and below 100V.

Q: What is the difference between Board Side and Mating Side flange features?

A: Board Side flange (M3 or 4-40) mounts the connector to the PCB with fasteners on the component side. Mating Side flange (Female Screwlock 4-40) provides locking mechanism on the connector mating face. Both are mechanically compatible with 25-position DB/B receptacles but serve different mounting and locking requirements.

Q: Are HARTING 09643127230 and 09643127240 different from 09643127210?

A: All three HARTING parts (09643127210, 09643127230, 09643127240) share identical electrical and thermal specifications. The numeric suffix indicates internal design variations not detailed in provided parameters. All three are equivalent substitutes with identical voltage (100V) and temperature (-20°C to 125°C) limitations.

Q: Why does 1-745967-4 show RoHS non-compliant status?

A: 1-745967-4 is a legacy TE Connectivity part that predates RoHS3 compliance requirements. It remains Active product status and functionally equivalent to L77TSBG25SOL2. Use only in applications where RoHS compliance is not mandated by customer specifications or regulatory requirements.

Q: Can I substitute a part with higher current rating (7.5A) for a 5A application?

A: Yes. Parts with higher current ratings (such as 09643127210 at 7.5A) are acceptable substitutes for 5A applications. The connector can safely handle lower current loads. Verify that other parameters (voltage, temperature, flange feature) meet application requirements.

Q: What does "Panel Mount, Through Hole" mean for 172-E25-213R011?

A: This connector supports both panel mounting (flush installation through a panel cutout) and through-hole PCB mounting. It provides installation flexibility compared to through-hole-only variants. Mechanical compatibility with standard 25-position DB/B mating connectors is maintained.

Q: Are contact finish differences (Gold vs. unspecified) significant for substitution?

A: Gold contact finish provides superior corrosion resistance and signal integrity. Parts with unspecified contact finish (09643127210) are acceptable substitutes but may have different long-term reliability in high-humidity or corrosive environments. For critical applications, prioritize gold-finished contacts.

Q: What does MSL 1 (Unlimited) mean?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life without moisture control. The connector does not require special dry-pack storage or baking procedures before soldering. All listed substitutes maintain MSL 1 rating.

Q: Can I use 172-E25-213R011 in a standard through-hole PCB application?

A: Yes. Although 172-E25-213R011 supports panel mounting, it is fully compatible with standard through-hole PCB assembly. The panel-mount capability is an additional feature, not a requirement. Use standard through-hole soldering procedures.

Q: Why is operating temperature range important for D-Sub connector selection?

A: Operating temperature range defines the dielectric material stability and contact reliability limits. L77TSBG25SOL2 supports -55°C to 125°C. Substitutes with narrower ranges (such as -20°C to 125°C) cannot be used in applications requiring full -55°C operation, such as aerospace or automotive cold-start environments.

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