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M20-9973545 Equivalent & Substitute Parts
Part Overview
The Harwin M20-9973545 is a rectangular connector header with 70 positions at 2.54mm pitch, designed for through-hole board-to-board or cable applications. This component features a cuttable, unshrouded design with male pins, solder termination, and gold-plated mating contacts. The part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | M20-9973545 |
| Manufacturer | Harwin Inc. |
| Category | Rectangular Connectors |
| Connector Type | Header, Cuttable |
| Contact Type | Male Pin |
| Pitch - Mating | 0.100" (2.54mm) |
| Number of Positions | 70 |
| Number of Rows | 2 |
| Row Spacing - Mating | 0.100" (2.54mm) |
| Mounting Type | Through Hole |
| Termination | Solder |
| Contact Length - Mating | 0.335" (8.51mm) |
| Contact Length - Post | 0.116" (2.95mm) |
| Overall Contact Length | 0.551" (14.00mm) |
| Insulation Height | 0.100" (2.54mm) |
| Contact Finish - Mating | Gold |
| Contact Material | Brass |
| Insulation Material | Polyamide (PA6T), Nylon 6T |
| Operating Temperature | -40°C ~ 105°C |
| Material Flammability Rating | UL94 V-0 |
| Current Rating | 3A per Contact |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitute parts for the M20-9973545 are qualified based on the following critical parameters that determine functional equivalence:
Core Matching Criteria:
- Pitch - Mating: 0.100" (2.54mm)
- Number of Positions: 70
- Number of Rows: 2
- Row Spacing - Mating: 0.100" (2.54mm)
- Contact Type: Male Pin
- Mounting Type: Through Hole
- Termination: Solder
- Connector Type: Header
- Fastening Type: Push-Pull
- Contact Shape: Square
- Insulation Height: 0.100" (2.54mm)
- Material Flammability Rating: UL94 V-0
- Current Rating: 3A
- RoHS Status: ROHS3 Compliant
Substitutes are grouped into two categories based on contact material and insulation material composition:
Group 1 - Preci-Dip 892 Series: Direct mechanical and electrical equivalent with brass contacts and nylon insulation, matching the original design approach.
Group 2 - Samtec HTSW/HMTSW Series: Active production alternatives featuring phosphor bronze contacts and liquid crystal polymer insulation, offering extended operating temperature ranges and enhanced reliability characteristics.
Parameter Comparison
| Parameter | M20-9973545 (Harwin) | 892-70-070-10-003101 (Preci-Dip) | HMTSW-135-08-G-D-340 (Samtec) | HTSW-135-14-F-D (Samtec) |
|---|---|---|---|---|
| Pitch - Mating | 0.100" (2.54mm) | 0.100" (2.54mm) | 0.100" (2.54mm) | 0.100" (2.54mm) |
| Number of Positions | 70 | 70 | 70 | 70 |
| Number of Rows | 2 | 2 | 2 | 2 |
| Row Spacing - Mating | 0.100" (2.54mm) | 0.100" (2.54mm) | 0.100" (2.54mm) | 0.100" (2.54mm) |
| Contact Type | Male Pin | Male Pin | Male Pin | Male Pin |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole |
| Termination | Solder | Solder | Solder | Solder |
| Contact Length - Mating | 0.335" (8.51mm) | 0.335" (8.51mm) | 0.340" (8.64mm) | 0.320" (8.13mm) |
| Contact Length - Post | 0.116" (2.95mm) | 0.118" (3.00mm) | 0.090" (2.29mm) | 0.110" (2.79mm) |
| Overall Contact Length | 0.551" (14.00mm) | 0.553" (14.04mm) | 0.530" (13.46mm) | 0.530" (13.46mm) |
| Insulation Height | 0.100" (2.54mm) | 0.100" (2.54mm) | 0.100" (2.54mm) | 0.100" (2.54mm) |
| Contact Finish - Mating | Gold | Gold | Gold | Gold |
| Contact Material | Brass | Brass | Phosphor Bronze | Phosphor Bronze |
| Insulation Material | Polyamide (PA6T), Nylon 6T | Polyamide (PA), Nylon, Glass Filled | Liquid Crystal Polymer (LCP) | Liquid Crystal Polymer (LCP) |
| Operating Temperature | -40°C ~ 105°C | -55°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C |
| Material Flammability Rating | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 |
| Current Rating | 3A per Contact | 3A | 3A | Varies by Wire Gauge |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active | Active | Active |
Engineering Selection Recommendations
Primary Substitute - Preci-Dip 892-70-070-10-003101: This part provides the closest mechanical and material equivalence to the M20-9973545. It maintains brass contact construction with nylon insulation, matching the original design philosophy. The part is in active production status with ROHS3 compliance and UL94 V-0 flammability rating. Operating temperature range extends to -55°C ~ 125°C, exceeding the original specification. This substitute is recommended for direct replacement in existing designs with minimal qualification effort.
Secondary Substitutes - Samtec HTSW/HMTSW Series: The Samtec HTSW-135 and HMTSW-135 series represent modern production alternatives with phosphor bronze contacts and liquid crystal polymer insulation. These parts offer superior operating temperature ranges (-55°C ~ 125°C) and are actively manufactured with full ROHS3 compliance. Multiple contact finish options are available within this series:
- HMTSW-135-08-G-D-340: Gold mating finish with gold post finish
- HMTSW-135-08-L-D-340: Gold mating finish with tin post finish
- HMTSW-135-08-S-D-340: Gold mating finish (30.0µin) with tin post finish
- HMTSW-135-08-T-D-340: Tin mating finish with tin post finish
- HTSW-135-14-F-D: Gold mating finish (3.00µin) with tin post finish
- HTSW-135-14-L-D: Gold mating finish (10.0µin) with tin post finish
All Samtec alternatives maintain the critical 70-position, 2.54mm pitch configuration with UL94 V-0 flammability rating and 3A current capacity. Selection among Samtec variants depends on specific contact finish requirements and post-termination specifications for the application.
Frequently Asked Questions (FAQ)
Q: Can the Preci-Dip 892-70-070-10-003101 be used as a direct replacement for the M20-9973545?
A: Yes. Both parts share identical pitch (0.100" / 2.54mm), position count (70), row configuration (2 rows), and core electrical specifications (3A current rating, UL94 V-0 flammability). The Preci-Dip part maintains brass contact construction and nylon insulation consistent with the original design. The primary difference is an extended operating temperature range (-55°C ~ 125°C versus -40°C ~ 105°C), which represents an improvement over the original specification.
Q: What are the key differences between the Preci-Dip and Samtec substitutes?
A: The Preci-Dip 892 series uses brass contacts with glass-filled nylon insulation, closely mirroring the original M20-9973545 design. The Samtec HTSW and HMTSW series employ phosphor bronze contacts with liquid crystal polymer insulation, representing a material upgrade. Both approaches maintain the required 70-position, 2.54mm pitch configuration and UL94 V-0 compliance. Contact material and insulation composition differences may affect mechanical durability and thermal performance in specific applications.
Q: Are there contact finish variations among the Samtec substitutes?
A: Yes. The Samtec series offers multiple contact finish combinations. Mating contact finishes include gold (various thicknesses: 3.00µin, 10.0µin, 30.0µin) and tin. Post contact finishes include gold, tin, and unspecified options. Selection depends on application requirements for corrosion resistance, solderability, and electrical conductivity. The HMTSW-135-08-G-D-340 provides gold on both mating and post contacts for maximum corrosion protection.
Q: Do all substitutes maintain the same current rating?
A: The Preci-Dip 892-70-070-10-003101 and Samtec HMTSW series maintain a 3A per-contact rating matching the original M20-9973545. The Samtec HTSW-135 series specifies current rating as "Varies by Wire Gauge," indicating current capacity depends on the specific wire gauge used in the application rather than a fixed per-contact specification.
Q: What is the significance of the operating temperature range differences?
A: The M20-9973545 operates from -40°C to 105°C. Both the Preci-Dip 892-70-070-10-003101 and Samtec alternatives extend this range to -55°C to 125°C. This extended range provides greater design margin for applications subject to extreme environmental conditions. If the original application operates within the -40°C to 105°C window, all substitutes remain fully qualified.
Q: Are all substitutes RoHS3 compliant?
A: Yes. The Preci-Dip 892-70-070-10-003101 and all Samtec variants (HMTSW-135 and HTSW-135 series) carry ROHS3 compliance certification, matching the original M20-9973545 specification.
Q: What is the difference between HMTSW and HTSW series designations?
A: The HMTSW series represents the Flex Stack variant with shorter post lengths (0.090" / 2.29mm) and liquid crystal polymer insulation. The HTSW series features longer post lengths (0.110" / 2.79mm) and also uses liquid crystal polymer insulation. Both series maintain the 70-position, 2.54mm pitch configuration. Selection between series depends on PCB layout requirements and available solder pad depth.
Q: Can the M20-9973545 be replaced with a non-cuttable header?
A: The M20-9973545 is specified as a cuttable header. While the Preci-Dip 892-70-070-10-003101 and Samtec substitutes are standard headers without explicit cuttable designation, they maintain the same 70-position configuration and can be used in applications where the full 70-position header is required. If cuttable functionality is essential, application-specific evaluation is necessary.
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