L77DC37SOL2 37-Position D-Sub Receptacle Connector: Equivalent & Substitute Parts

Part Overview

The L77DC37SOL2 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 2-row configuration with shell size 4 (DC, C) layout. The connector is classified as Active product status with full RoHS compliance and unlimited moisture sensitivity rating.

Substitute parts become necessary when the primary part experiences supply constraints, obsolescence of related components in a system, or when design requirements permit alternative mechanical mounting configurations or electrical ratings within acceptable parameters. The substitute parts listed maintain core electrical and mechanical compatibility while offering variations in mounting style, current rating, contact finish thickness, and operating temperature ranges.

Substiute Parts

L77DC37SOL2

Amphenol ICC (Commercial Products)In Stock: 682L77DC37SOL2 Datasheet

Current PartRFQ

172-037-212R001

NorComp Inc.In Stock: 1254172-037-212R001 Datasheet

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172-037-212R011

NorComp Inc.In Stock: 946172-037-212R011 Datasheet

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172-037-212R911

NorComp Inc.In Stock: 1124172-037-212R911 Datasheet

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A-DF 37 PP/Z

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

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D37S24A4GX00LF

Amphenol ICC (FCI)In Stock: 1575D37S24A4GX00LF Datasheet

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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 L77DC37SOL2 is determined by strict adherence to the following core parameters:

Critical Parameters (Must Match Exactly):

• 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 (Within Acceptable Ranges):

• Mounting Type: Through Hole variants (vertical solder, panel mount through hole)
• Current Rating: Minimum 5A acceptable; 7.5A preferred
• Voltage Rating: Minimum 250V acceptable; 300V preferred
• Operating Temperature Range: Minimum -50°C to 100°C acceptable; -55°C to 125°C preferred
• Contact Finish Thickness: Flash or 8.00µin both acceptable
• Shell Material Finish: Steel with Tin Plated or Tin-Nickel Plated acceptable
• Contact Material: Brass, Copper Alloy, or Phosphor Bronze acceptable
• Dielectric Material: Thermoplastic Glass Filled or Polybutylene Terephthalate (PBT) acceptable
• RoHS Status: RoHS Compliant or ROHS3 Compliant acceptable
• Product Status: Active or Obsolete acceptable for legacy system support

Non-Substitutable Parameters:

• Connector Style: D-Sub (fixed)
• Flange Feature variations that alter mechanical fit: Housing/Shell (Unthreaded) is primary; Board Side or Housing/Shell with specific screw sizes represent design variations requiring validation

The substitute parts identified below maintain compatibility with the L77DC37SOL2 within these parameter boundaries.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Parameter Alignment):

The D37S24A4GX00LF and D37S24A4PL00LF from Amphenol ICC (FCI) Delta D series represent the closest electrical and mechanical equivalents to the L77DC37SOL2. Both parts maintain identical operating temperature range (-55°C to 125°C), voltage rating (300V), and current rating (5A per contact). These parts are Active status with current manufacturing support. The D37S24A4GX00LF features Housing/Shell (4-40) flange, while D37S24A4PL00LF features Housing/Shell (M3) flange. Selection between these variants depends on PCB mounting hole specifications. Both are ROHS3 or RoHS compliant.

Secondary Substitutes (Active Status, Reduced Current Rating):

The A-DF 37 PP/Z from Assmann WSW Components is an Active product offering through-hole vertical solder mounting identical to the L77DC37SOL2. This part carries a reduced current rating of 3A per contact and narrower operating temperature range (-20°C to 105°C) compared to the primary part. Voltage rating is 250V. This substitute is suitable for applications where current and temperature requirements do not exceed these specifications. ROHS3 compliance is confirmed.

The DC37S364TLF from Amphenol ICC (FCI) D series is Active status with 5A per contact current rating and full -55°C to 125°C operating temperature range. Voltage rating matches at 300V. This part offers compatibility for applications requiring the original electrical specifications with alternative contact material (Copper Alloy vs. Brass).

Tertiary Substitutes (Obsolete Status, Legacy System Support):

The NorComp Inc. 172-037-212R001, 172-037-212R011, and 172-037-212R911 are classified as Obsolete. These parts are suitable only for legacy system maintenance or replacement scenarios where original part sourcing is no longer viable. All three maintain 37-position, 2-row, shell size 4 configuration with solder termination. Current rating is reduced to 5A. Operating temperature range is -50°C to 100°C. The 172-037-212R011 and 172-037-212R911 feature panel mount through-hole configuration with board-side flanges (4-40 or 4-40 with female screwlock), representing mechanical variations from the primary part. ROHS3 compliance is confirmed for all three NorComp parts.

Compliance and Certification Basis:

All substitute parts maintain UL94 V-0 flammability rating (except DC37S364TLF where not specified) and RoHS or ROHS3 compliance. REACH status is Unaffected or Affected as specified in individual part data. Selection should prioritize Active status parts (D37S24A4GX00LF, D37S24A4PL00LF, A-DF 37 PP/Z, DC37S364TLF) for new designs and ongoing production. Obsolete parts (NorComp series) are restricted to legacy system support where design constraints mandate compatibility with existing hardware.

Frequently Asked Questions (FAQ)

Q1: Can the 172-037-212R001 directly replace the L77DC37SOL2 in a new design?

A: The 172-037-212R001 is classified as Obsolete and should not be selected for new designs. While it maintains 37-position, 2-row, shell size 4 configuration with solder termination, the Obsolete status indicates discontinued manufacturing. For new designs, select from Active status alternatives: D37S24A4GX00LF, D37S24A4PL00LF, A-DF 37 PP/Z, or DC37S364TLF.

Q2: What is the difference between D37S24A4GX00LF and D37S24A4PL00LF?

A: Both parts are electrically identical with 5A per contact current rating, 300V voltage rating, and -55°C to 125°C operating temperature. The primary difference is the flange feature: D37S24A4GX00LF has Housing/Shell (4-40) flange, while D37S24A4PL00LF has Housing/Shell (M3) flange. Selection depends on PCB mounting hole specifications. Both are Active status with ROHS3 or RoHS compliance.

Q3: Is the A-DF 37 PP/Z suitable for high-current applications?

A: The A-DF 37 PP/Z carries a 3A per contact current rating, which is lower than the L77DC37SOL2 (7.5A) and most other substitutes (5A per contact). This part is suitable only for applications where current requirements do not exceed 3A per contact. For higher current applications, select D37S24A4GX00LF, D37S24A4PL00LF, or DC37S364TLF.

Q4: What is the significance of contact finish thickness differences?

A: The L77DC37SOL2 specifies 8.00µin (0.203µm) gold contact finish thickness, while substitute parts specify Flash thickness. Flash plating provides minimal gold coverage for contact protection. The thicker 8.00µin specification on the primary part offers enhanced durability and contact reliability. For applications requiring extended contact life or high-cycle mating, the L77DC37SOL2 is preferred. Substitute parts with Flash finish are acceptable for standard applications.

Q5: Can NorComp 172-037-212R911 be used as a replacement if the L77DC37SOL2 becomes unavailable?

A: The 172-037-212R911 is Obsolete status and should be considered only for legacy system maintenance. It maintains 37-position, 2-row, shell size 4 configuration but features panel mount through-hole mounting with board-side (4-40) and mating-side female screwlock (4-40) flanges. This represents a mechanical variation from the L77DC37SOL2 vertical through-hole mounting. Compatibility requires PCB redesign or mechanical adapter validation. For ongoing production, Active status alternatives are recommended.

Q6: What are the operating temperature limitations when substituting parts?

A: The L77DC37SOL2 operates from -55°C to 125°C. Substitute parts have varying ranges: D37S24A4GX00LF and D37S24A4PL00LF match this range exactly. The A-DF 37 PP/Z operates -20°C to 105°C (narrower range). NorComp parts operate -50°C to 100°C (narrower range). For applications requiring full -55°C to 125°C operation, select D37S24A4GX00LF, D37S24A4PL00LF, or DC37S364TLF. Verify application temperature requirements before substitution.

Q7: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are either RoHS Compliant or ROHS3 Compliant. The L77DC37SOL2 is RoHS Compliant. ROHS3 represents an updated compliance standard and is acceptable for RoHS-regulated applications. Verify specific regulatory requirements for your application region.

Q8: What mounting configuration differences exist among substitutes?

A: The L77DC37SOL2, A-DF 37 PP/Z, D37S24A4GX00LF, D37S24A4PL00LF, and DC37S364TLF all feature Through Hole vertical solder mounting. The NorComp parts (172-037-212R001, 172-037-212R011, 172-037-212R911) feature Panel Mount, Through Hole configuration, which requires different PCB hole patterns and mechanical support. Verify PCB design compatibility before selecting NorComp substitutes.

Q9: How do contact material differences affect performance?

A: The L77DC37SOL2 uses Brass contacts. Substitute parts use Brass (NorComp series), Copper Alloy (A-DF 37 PP/Z, DC37S364TLF), or Phosphor Bronze (D37S24A4GX00LF, D37S24A4PL00LF). All materials are acceptable for signal-level D-Sub applications. Phosphor Bronze offers enhanced spring characteristics and durability. Copper Alloy provides cost efficiency. Brass offers balanced performance. Material selection does not affect electrical compatibility for standard applications.

Q10: What inventory considerations apply to these substitutes?

A: Current inventory levels are: L77DC37SOL2 (670 pcs), 172-037-212R001 (1158 pcs), 172-037-212R011 (840 pcs), 172-037-212R911 (1030 pcs), A-DF 37 PP/Z (968 pcs), D37S24A4GX00LF (1502 pcs), D37S24A4PL00LF (805 pcs), DC37S364TLF (1110 pcs). For immediate availability, D37S24A4GX00LF offers the highest stock level. For long-term supply security, Active status parts (D37S24A4GX00LF, D37S24A4PL00LF, A-DF 37 PP/Z, DC37S364TLF) are preferred over Obsolete NorComp parts.