L77DC37STR063 Equivalent & Substitute Parts Reference

Part Overview

The L77DC37STR063 is a 37-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This through-hole solder-terminated connector features female sockets in a vertical orientation with a 4-position shell size (DC, C layout). The connector is designed for signal applications requiring robust electrical performance across industrial temperature ranges.

The L77DC37STR063 maintains active product status with 751 units in current inventory. Equivalent and substitute parts are identified for applications requiring alternative mounting configurations, shell finishes, contact materials, or compliance certifications while maintaining core electrical and mechanical compatibility within the 37-position D-Sub receptacle category.

Substiute Parts

L77DC37STR063

Amphenol ICC (Commercial Products)In Stock: 793L77DC37STR063 Datasheet

Current PartRFQ

172-E37-213R001

NorComp Inc.In Stock: 1578172-E37-213R001 Datasheet

SimilarRFQ

172-E37-213R011

NorComp Inc.In Stock: 1242172-E37-213R011 Datasheet

SimilarRFQ

A-DF 37 PP/Z

Assmann WSW ComponentsIn Stock: 996A-DF 37 PP/Z Datasheet

SimilarRFQ

D37S24A4GX00LF

Amphenol ICC (FCI)In Stock: 1575D37S24A4GX00LF Datasheet

SimilarRFQ

D37S24A4PL00LF

Amphenol ICC (FCI)In Stock: 872D37S24A4PL00LF Datasheet

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DC37S364TLF

Amphenol ICC (FCI)In Stock: 1134DC37S364TLF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the L77DC37STR063 is determined by strict adherence to the following core parameters:

Critical Parameters (Must Match):

• Connector Type: Receptacle, Female Sockets
• Number of Positions: 37
• Number of Rows: 2
• Shell Size, Connector Layout: 4 (DC, C)
• Termination: Solder
• Contact Type: Signal

Allowable Variation Parameters:

• Mounting Type: Through Hole variants with different flange features (unthreaded, board-side, panel-mount)
• Shell Material Finish: Steel with tin plating, nickel plating, or tin-nickel plating
• Contact Material: Brass or phosphor bronze
• Current Rating: 3A to 7.5A per contact
• Voltage Rating: 250V to 300V
• Operating Temperature: Ranges within -55°C to 125°C
• Dielectric Material: Thermoplastic, glass-filled variants, polyamide, or polybutylene terephthalate
• Manufacturer: Amphenol ICC, NorComp Inc., Assmann WSW Components

Non-Substitutable Parameters:

• Connector style (D-Sub fixed)
• Position count (37 fixed)
• Row configuration (2 rows fixed)
• Solder termination (fixed)

Five substitute parts meet these criteria with varying feature combinations suitable for different application requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

D37S24A4GX00LF and D37S24A4PL00LF (Amphenol ICC Delta D Series) are the closest functional equivalents to the L77DC37STR063. Both maintain identical operating temperature range (-55°C ~ 125°C), 300V voltage rating, and UL94 V-0 flammability rating. These parts feature phosphor bronze contacts and polybutylene terephthalate dielectric material. The primary distinction is flange configuration: D37S24A4GX00LF includes board lock feature with 4-40 mounting holes, while D37S24A4PL00LF uses M3 mounting holes. Current rating is 5A per contact versus 7.5A for the main part. Both are ROHS3 compliant with active product status.

DC37S364TLF (Amphenol ICC D Series) provides equivalent electrical performance with 300V rating and -55°C ~ 125°C operating range. This part maintains tin-plated steel shell finish and thermoplastic dielectric material similar to the L77DC37STR063. Current rating is 5A per contact. RoHS compliance is confirmed. This option is suitable for applications where shell finish and dielectric material consistency with the original part is prioritized.

Secondary Substitutes (Conditional Compatibility):

172-E37-213R001 and 172-E37-213R011 (NorComp Inc. 172-E Series) are panel-mount variants with through-hole termination. Both feature nickel-plated steel shells and polyamide dielectric material. Operating temperature range is -50°C ~ 100°C, which is narrower than the main part. Current rating is 5A. These parts are suitable for applications where panel-mount configuration is required and operating temperature does not exceed 100°C. ROHS3 compliance is confirmed.

A-DF 37 PP/Z (Assmann WSW Components) is a through-hole solder-terminated receptacle with tin-plated steel shell and polybutylene terephthalate dielectric. Operating temperature range is -20°C ~ 105°C. Current rating is 3A, which is the lowest among all substitutes. Voltage rating is 250V. This part is suitable only for applications with reduced current and voltage requirements and operating temperatures above -20°C. ROHS3 compliance is confirmed.

Compliance and Certification Considerations:

All substitute parts maintain UL94 V-0 flammability rating except DC37S364TLF, which does not specify this parameter. All parts are RoHS or ROHS3 compliant. The L77DC37STR063, D37S24A4PL00LF, and DC37S364TLF are RoHS Compliant. The 172-E series and A-DF 37 PP/Z are ROHS3 Compliant. D37S24A4GX00LF is ROHS3 Compliant with REACH Affected status, indicating potential substance of concern documentation requirements.

Frequently Asked Questions (FAQ)

Q: Can D37S24A4GX00LF replace L77DC37STR063 in all applications?

A: D37S24A4GX00LF is functionally compatible for applications within the specified operating temperature range (-55°C ~ 125°C) and voltage requirements (300V). The primary difference is current rating: D37S24A4GX00LF is rated 5A per contact versus 7.5A for L77DC37STR063. Applications requiring current levels between 5A and 7.5A per contact must use the original part. The board lock feature and 4-40 mounting holes of D37S24A4GX00LF provide additional mechanical retention not present in the original part.

Q: What is the difference between 172-E37-213R001 and 172-E37-213R011?

A: Both parts are 37-position D-Sub receptacles from NorComp Inc. with identical electrical specifications. The distinction is in flange configuration: 172-E37-213R001 features unthreaded housing/shell, while 172-E37-213R011 includes board-side mounting with 4-40 threaded holes. Both support panel-mount and through-hole installation. Selection depends on mechanical mounting requirements of the application.

Q: Why does A-DF 37 PP/Z have a lower current rating than other substitutes?

A: A-DF 37 PP/Z is rated 3A per contact, compared to 5A or 7.5A for other options. This reflects design differences in contact geometry, material composition, and thermal characteristics. The copper alloy contact material and polybutylene terephthalate dielectric of A-DF 37 PP/Z result in lower current-carrying capacity. This part is suitable only for applications with current requirements not exceeding 3A per contact.

Q: Are the NorComp 172-E series parts suitable for high-temperature applications?

A: No. The 172-E37-213R001 and 172-E37-213R011 are rated for -50°C ~ 100°C operating temperature, which is narrower than the L77DC37STR063 (-55°C ~ 125°C). These parts are not suitable for applications requiring operation above 100°C or below -50°C. Applications requiring the full -55°C ~ 125°C range must use L77DC37STR063, D37S24A4GX00LF, D37S24A4PL00LF, or DC37S364TLF.

Q: What is the significance of contact finish thickness differences?

A: L77DC37STR063 specifies 8.00µin (0.203µm) gold contact finish thickness, while all substitute parts specify flash thickness. Flash plating provides minimal gold coverage for corrosion protection and contact resistance. The thicker plating of L77DC37STR063 offers enhanced durability and contact reliability in high-cycle mating applications. Applications with frequent connector mating cycles may benefit from the original part's thicker gold plating.

Q: Can I use DC37S364TLF if flammability rating is not specified?

A: DC37S364TLF does not specify UL94 flammability rating in the provided data. Applications requiring documented UL94 V-0 compliance should use parts with explicit flammability certification: L77DC37STR063, 172-E37-213R001, 172-E37-213R011, A-DF 37 PP/Z, D37S24A4GX00LF, or D37S24A4PL00LF. DC37S364TLF is suitable for applications where flammability rating is not a requirement.

Q: What mounting configurations are available among the substitutes?

A: L77DC37STR063, A-DF 37 PP/Z, D37S24A4GX00LF, D37S24A4PL00LF, and DC37S364TLF are through-hole vertical mount receptacles with unthreaded or threaded flange options. 172-E37-213R001 and 172-E37-213R011 support both panel-mount and through-hole configurations. D37S24A4GX00LF includes board lock feature. D37S24A4PL00LF uses M3 mounting holes. Selection depends on PCB layout and mechanical mounting requirements.

Q: Are all substitute parts in active production?

A: Yes. All substitute parts maintain active product status. Inventory levels vary: D37S24A4GX00LF has the highest inventory (1502 pcs), while L77DC37STR063 has 751 pcs. Availability should be confirmed with component suppliers for time-sensitive applications.