73JB20K Equivalent & Substitute Parts Reference

Part Overview

The Honeywell Sensing and Productivity Solutions 73JB20K is a 20k Ohm, 2W wirewound linear potentiometer designed for panel mount applications with a 10-turn adjustment mechanism and solder lug termination. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production, maintenance, and design continuity. The 73JB series has been discontinued, requiring engineers to identify functionally compatible alternatives from active product lines that maintain electrical and mechanical compatibility.

Substiute Parts

73JB20K

Honeywell Sensing and Productivity SolutionsIn Stock: 100573JB20K Datasheet

Current PartRFQ

534B1203JC

Vishay SpectrolIn Stock: 816534B1203JC Datasheet

DirectRFQ

3590S-1-203L

Bourns Inc.In Stock: 12453590S-1-203L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 73JB20K are identified based on strict electrical and mechanical parameter matching. The substitution logic requires:

Electrical Parameters (Non-negotiable):

• Resistance value: 20k Ohm (exact match)
• Power rating: 2W (minimum requirement)
• Taper: Linear (functional requirement)
• Number of turns: 10 (resolution requirement)
• Tolerance: ±5% (accuracy requirement)
• Resistive material: Wirewound (performance characteristic)

Mechanical Parameters (Non-negotiable):

• Termination style: Solder Lug (connection compatibility)
• Mounting type: Panel Mount (installation requirement)
• Bushing thread: 3/8-32 (panel cutout compatibility)
• Actuator type: Slotted (adjustment interface)
• Body diameter: 0.875" (22.23mm) (envelope requirement)

Compliance Parameters (Preferred):

• RoHS compliance status
• Moisture sensitivity level: 1 (Unlimited)

The identified substitutes—534B1203JC (Vishay Spectrol) and 3590S-1-203L (Bourns Inc.)—meet all critical electrical and mechanical requirements while offering active product status and improved compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

534B1203JC (Vishay Spectrol) - Direct Substitute:

The 534B1203JC is the primary equivalent for the 73JB20K. This part maintains identical electrical specifications (20k Ohm, 2W, ±5% tolerance, 10-turn linear wirewound) and mechanical compatibility (3/8-32 bushing thread, panel mount, solder lug termination). The temperature coefficient specification of 20ppm/°C (versus ±20ppm/°C for the original) represents improved thermal stability. The part carries ROHS3 compliance certification and maintains MSL 1 rating. Active product status ensures long-term availability and supply chain continuity. Actuator dimensions (0.812" length, 0.2497" diameter) are within acceptable mechanical tolerances of the original design.

3590S-1-203L (Bourns Inc.) - Alternative Substitute:

The 3590S-1-203L provides functional equivalence with all critical electrical parameters matched (20k Ohm, 2W, ±5% tolerance, 10-turn linear wirewound). Mechanical compatibility is maintained through identical bushing thread (3/8-32), mounting type (panel mount), and termination style (solder lug). The temperature coefficient specification of ±50ppm/°C is broader than the original but remains within acceptable operational ranges for most applications. ROHS3 compliance is confirmed. The part is actively manufactured by Bourns Inc., ensuring supply availability. Actuator dimensions (0.812" length, 0.248" diameter) are mechanically compatible. MSL classification is not applicable for this part.

Selection Criteria:

• For applications requiring tighter temperature stability: select 534B1203JC (20ppm/°C)
• For applications with standard temperature requirements: either substitute is acceptable
• Both substitutes are active products with established supply chains
• Both meet current RoHS3 compliance requirements
• Mechanical envelope compatibility is confirmed for both alternatives

Frequently Asked Questions (FAQ)

Q: Can the 534B1203JC directly replace the 73JB20K without circuit modifications?

A: Yes. The 534B1203JC maintains identical electrical specifications (20k Ohm, 2W, ±5% tolerance, 10-turn linear) and mechanical compatibility (3/8-32 panel mount, solder lug termination). No circuit modifications are required. The improved temperature coefficient (20ppm/°C) may enhance circuit stability.

Q: What is the difference between the two substitute parts?

A: Both 534B1203JC and 3590S-1-203L meet all critical electrical and mechanical requirements. The primary difference is temperature coefficient: 534B1203JC specifies 20ppm/°C while 3590S-1-203L specifies ±50ppm/°C. For temperature-sensitive applications, 534B1203JC is preferred. For standard applications, both are functionally equivalent.

Q: Are the actuator dimensions identical across all three parts?

A: Actuator dimensions are within acceptable mechanical tolerances. The 73JB20K specifies 0.813" length and 0.250" diameter. Both substitutes specify 0.812" length and approximately 0.249" diameter. These variations (0.001" to 0.002") are within standard mechanical tolerances and do not affect panel mount compatibility or adjustment functionality.

Q: Do the substitute parts meet current compliance requirements?

A: Yes. Both 534B1203JC and 3590S-1-203L carry ROHS3 compliance certification, exceeding the RoHS compliance of the original 73JB20K. Both parts are classified as EAR99 for export control purposes.

Q: Why is the 73JB20K listed as obsolete?

A: The 73JB series has been discontinued by Honeywell Sensing and Productivity Solutions. The identified substitutes from Vishay Spectrol and Bourns Inc. represent active product lines that provide equivalent functionality with improved compliance certifications and supply chain availability.

Q: Can I use these substitutes in new designs?

A: Yes. Both 534B1203JC and 3590S-1-203L are active products suitable for new designs. They provide improved compliance status (ROHS3) and long-term supply availability compared to the obsolete 73JB20K.

Q: What is the significance of the 10-turn specification?

A: The 10-turn specification indicates the potentiometer requires 10 complete rotations (3600°) to traverse the full resistance range. This provides fine adjustment resolution. Both substitutes maintain this 10-turn characteristic, ensuring equivalent adjustment precision and control sensitivity.

Q: Are there any inventory considerations for these substitutes?

A: Current inventory status shows 786 units of 534B1203JC (Vishay Spectrol) and 1137 units of 3590S-1-203L (Bourns Inc.) available. Both parts are actively stocked, providing supply security for production requirements.