PJ-021-SMT Equivalent & Substitute Parts

Part Overview

The PJ-021-SMT is a power barrel connector jack manufactured by CUI Devices, designed for surface mount, right-angle applications. This connector features a 1.75mm ID / 4.75mm OD barrel configuration with 2 conductors and 3 contacts, rated for 16VDC at 5A. The product is currently obsolete, making identification of suitable substitute components essential for ongoing design support, maintenance, and production continuity.

Key Parameters

Parameter	Value
Connector Type	Jack (Male)
Mating Diameter	1.75mm ID (0.068"), 4.75mm OD (0.187")
Mounting Type	Surface Mount, Right Angle
Number of Contacts	2 Conductors, 3 Contacts
Internal Switch	Single Switch, Normally Closed
Voltage Rating	16VDC
Current Rating	5A
Termination	Solder
Housing Material	Polyamide (PA), Nylon
Operating Temperature	-25°C ~ 85°C
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of the PJ-021-SMT is based on the following critical parameters that must remain consistent or compatible:

Connector Type & Gender: Jack (Male) configuration
Mating Diameter: 1.75mm ID / 4.75mm OD barrel standard
Mounting Configuration: Surface mount, right-angle orientation
Contact Configuration: 2 conductors, 3 contacts with single normally-closed switch
Electrical Ratings: Voltage and current capacity sufficient for application requirements
Termination Method: Solder attachment to PCB
Environmental Compliance: RoHS and REACH compliance status

The substitute part PJ1-021-SMT-TR meets these criteria while offering enhanced product status and updated material specifications.

Parameter Comparison

Parameter	PJ-021-SMT (Main Part)	PJ1-021-SMT-TR (Substitute)
Manufacturer	CUI Devices	CUI Devices
Connector Type	Jack (Male)	Jack (Male)
Industry Recognized Mating Diameter	1.75mm ID (0.068"), 4.75mm OD (0.187")	1.70mm ID (0.067"), 4.75mm OD (0.187") EIAJ-3
Actual Diameter	0.065" (1.65mm ID), 0.203" (5.15mm OD)	0.065" (1.65mm ID), 0.203" (5.15mm OD)
Mounting Type	Surface Mount, Right Angle	Surface Mount, Right Angle
Number of Contacts	2 Conductors, 3 Contacts	2 Conductors, 3 Contacts
Internal Switch	Single Switch, Normally Closed	Single Switch, Normally Closed
Termination	Solder	Solder
Voltage Rating	16VDC	24VDC
Current Rating	5A	5A
Mating Length/Depth	0.315" (8.00mm)	0.319" (8.10mm)
Material Flammability Rating	UL94 V-0	UL94 V-0
Operating Temperature	-25°C ~ 85°C	-25°C ~ 85°C
Contact Material - Plating	Silver	Silver
Housing Material	Polyamide (PA), Nylon	Polyamide (PA6T), Nylon 6T
Contact Material	Brass	Brass, Copper Alloy
Body Color	Black	Black
Product Status	Obsolete	Active
RoHS Status	RoHS Compliant	ROHS3 Compliant
Packaging	Bulk	Tape & Reel (TR)

Engineering Selection Recommendations

The PJ1-021-SMT-TR is a direct substitute for the obsolete PJ-021-SMT based on the following engineering criteria:

Electrical Compatibility: The substitute part is rated for 24VDC, which exceeds the original 16VDC specification. This higher voltage rating provides additional design margin for applications operating at or below 16VDC. Current rating remains constant at 5A.

Mechanical Compatibility: Both parts share identical actual diameters (0.065" ID, 0.203" OD) and mounting configurations. The mating length difference of 0.004" (0.10mm) is negligible for connector engagement and PCB layout purposes.

Material Specifications: The substitute employs PA6T (polyamide 6T) and copper alloy contact materials, representing material evolution from the original PA and brass specifications. Both maintain UL94 V-0 flammability ratings and identical operating temperature ranges.

Compliance Status: The substitute part carries ROHS3 compliance, superseding the original RoHS compliance designation. Both parts maintain REACH Unaffected status and identical ECCN/HTSUS classifications.

Product Availability: The substitute is in active production status with 1138 units in stock, compared to the obsolete status of the original part with 767 units remaining.

Frequently Asked Questions (FAQ)

Q: Can PJ1-021-SMT-TR directly replace PJ-021-SMT in existing designs?

A: Yes. Both connectors share identical actual mating diameters, contact configurations, mounting types, and electrical current ratings. The higher voltage rating of the substitute (24VDC vs. 16VDC) is compatible with applications designed for 16VDC operation.

Q: What is the difference between the industry recognized mating diameters?

A: The original part specifies 1.75mm ID, while the substitute specifies 1.70mm ID with EIAJ-3 standard designation. However, both parts have identical actual measured diameters of 0.065" (1.65mm ID), indicating the substitute conforms to a recognized international standard while maintaining physical compatibility.

Q: Are there material differences between the two parts?

A: Yes. The substitute uses PA6T (polyamide 6T) instead of standard PA, and includes copper alloy in addition to brass for contact materials. These represent material improvements while maintaining equivalent electrical and thermal performance.

Q: What packaging differences exist?

A: The original part is supplied in bulk packaging, while the substitute is supplied in Tape & Reel (TR) format. This affects handling and automated assembly processes but does not impact connector functionality.

Q: Is the 0.004" difference in mating length significant?

A: No. The mating length difference of 0.004" (0.10mm) is within typical connector tolerance ranges and does not affect PCB layout, connector engagement, or electrical performance.

Q: What compliance certifications apply to the substitute part?

A: The substitute carries ROHS3 compliance, UL94 V-0 flammability rating, REACH Unaffected status, and maintains identical ECCN (EAR99) and HTSUS (8536.69.4040) classifications as the original part.

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