172-E50-201-021 D-Sub Receptacle Connector Equivalent & Substitute Parts

Part Overview

The 172-E50-201-021 is a 50-position D-Sub receptacle connector manufactured by NorComp Inc., designed for panel mount applications with female socket contacts. This connector is part of the 172-E series and features solder cup termination for 20-26 AWG wire gauges. The main part is currently in stock with 1131 pieces available.

Finding equivalent and substitute parts becomes necessary when the original part reaches end-of-life status, when alternative packaging options are required, or when compliance requirements change. The substitute parts listed maintain functional compatibility while offering different material finishes, compliance certifications, or availability options.

Key Parameters

Parameter	Value
Connector Style	D-Sub
Connector Type	Receptacle, Female Sockets
Number of Positions	50
Number of Rows	3
Shell Size, Connector Layout	5 (DD, D)
Mounting Type	Panel Mount
Termination	Solder Cup
Wire Gauge	20-26 AWG
Current Rating	5A
Operating Temperature	-50°C ~ 100°C

Substitute Part Grouping Explanation

Substitution eligibility for the 172-E50-201-021 is determined by strict equivalence across the following critical parameters:

Connector Style: D-Sub
Connector Type: Receptacle, Female Sockets
Number of Positions: 50
Number of Rows: 3
Shell Size, Connector Layout: 5 (DD, D)
Mounting Type: Panel Mount
Termination: Solder Cup
Wire Gauge: 20-26 AWG
Current Rating: 5A
Operating Temperature: -50°C ~ 100°C
Contact Type: Signal
Flange Feature: Cable Side (4-40)
Contact Form: Machined
Dielectric Material: Polybutylene Terephthalate (PBT)
Contact Material: Brass

The two substitute parts listed (172-E50-201R021 and 172-E50-203R021) meet all these core functional and mechanical requirements. Variations exist only in shell material finish, RoHS compliance status, and product lifecycle status, which do not affect electrical or mechanical interchangeability.

Parameter Comparison

Parameter	172-E50-201-021	172-E50-201R021	172-E50-203R021
Manufacturer	NorComp Inc.	NorComp Inc.	NorComp Inc.
Category	D-Sub, D-Shaped Connectors	D-Sub, D-Shaped Connectors	D-Sub, D-Shaped Connectors
Connector Style	D-Sub	D-Sub	D-Sub
Connector Type	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets
Number of Positions	50	50	50
Number of Rows	3	3	3
Shell Size, Connector Layout	5 (DD, D)	5 (DD, D)	5 (DD, D)
Mounting Type	Panel Mount	Panel Mount	Panel Mount
Termination	Solder Cup	Solder Cup	Solder Cup
Shell Material, Finish	Steel, Yellow Chromate Plated	Steel, Yellow Chromate Plated	Steel, Nickel Plated
Contact Finish	Gold	Gold	Gold
Contact Finish Thickness	Flash	Flash	Flash
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0
Current Rating (Amps)	5A	5A	5A
Color	White	White	White
Contact Form	Machined	Machined	Machined
Dielectric Material	Polybutylene Terephthalate (PBT)	Polybutylene Terephthalate (PBT)	Polybutylene Terephthalate (PBT)
Wire Gauge	20-26 AWG	20-26 AWG	20-26 AWG
Contact Material	Brass	Brass	Brass
Operating Temperature	-50°C ~ 100°C	-50°C ~ 100°C	-50°C ~ 100°C
Product Status	Active	Obsolete	Active
RoHS Status	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant
Inventory (Pcs)	1131	1257	1099

Engineering Selection Recommendations

172-E50-201-021 (Primary Part): This part maintains active product status and is currently in stock. It is suitable for applications where RoHS non-compliance is acceptable or where legacy system compatibility is required.

172-E50-201R021 (Direct Substitute): This part is functionally identical to the main part but carries obsolete product status. It features the same yellow chromate plating on the steel shell and identical RoHS non-compliance status. Selection of this part should be limited to legacy system maintenance or when existing inventory must be utilized.

172-E50-203R021 (Recommended Substitute): This part is functionally equivalent with active product status and ROHS3 compliance certification. The primary difference is the nickel-plated steel shell finish instead of yellow chromate plating. This part is recommended for new designs or systems requiring RoHS3 compliance. The nickel plating provides equivalent corrosion resistance and electrical performance while meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Are these three parts electrically interchangeable? A: Yes. All three parts share identical electrical specifications including 50-position configuration, 5A current rating, gold contact finish, and operating temperature range of -50°C to 100°C.

Q: What is the difference between yellow chromate and nickel plating? A: Both finishes provide corrosion protection for the steel shell. Yellow chromate plating is the traditional finish used in the 172-E50-201-021 and 172-E50-201R021. Nickel plating, used in the 172-E50-203R021, offers equivalent protection and is compatible with RoHS3 compliance requirements.

Q: Why should I choose 172-E50-203R021 over the other options? A: The 172-E50-203R021 is the only option with active product status and ROHS3 compliance. For new designs or systems requiring regulatory compliance, this part is the appropriate selection.

Q: Can I use 172-E50-201R021 in new designs? A: The 172-E50-201R021 carries obsolete product status, making it unsuitable for new designs. It should be reserved for legacy system maintenance or replacement applications only.

Q: Are there packaging differences between these parts? A: All three parts are supplied in tray packaging. No functional packaging differences affect interchangeability.

Q: What wire gauges are compatible with these connectors? A: All three parts accept 20-26 AWG wire gauges for solder cup termination.

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