Bourns 3309P-1-102 Trimmer Potentiometer Equivalent & Substitute Parts

Part Overview

The Bourns 3309P-1-102 is a 1 kOhm, 0.5W through-hole trimmer potentiometer with cermet resistive material and top adjustment. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. The part operates within standard industrial temperature ranges with ±250ppm/°C temperature coefficient and ±25% resistance tolerance.

Substiute Parts

3309P-1-102

Bourns Inc.In Stock: 7503309P-1-102 Datasheet

Current PartRFQ

37PR1KLF

TT Electronics/BIIn Stock: 111337PR1KLF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3309P-1-102 is determined by the following critical parameters:

• Resistance Value: 1 kOhms (exact match required)
• Power Rating: 0.5W minimum (equal or greater acceptable)
• Adjustment Type: Top Adjustment (functional requirement)
• Mounting Type: Through Hole (PCB compatibility requirement)
• Termination Style: PC Pins (soldering compatibility requirement)
• Resistive Material: Cermet (performance characteristic)
• Number of Turns: 1 (adjustment range requirement)

The TT Electronics/BI 37PR1KLF meets all critical substitution criteria. While minor dimensional variations exist (0.346" vs 0.354" height), the rectangular form factor and PC pin termination ensure mechanical and electrical compatibility in standard through-hole applications.

Parameter Comparison

Engineering Selection Recommendations

The TT Electronics/BI 37PR1KLF is a direct functional substitute for the obsolete Bourns 3309P-1-102. Selection is supported by the following factors:

• All critical electrical parameters match exactly: 1 kOhms resistance, 0.5W power rating, ±250ppm/°C temperature coefficient, and single-turn adjustment.
• The 37PR1KLF features a tighter tolerance specification (±20% vs ±25%), providing improved performance margin in applications requiring precision adjustment.
• Both components maintain identical through-hole PC pin termination, ensuring direct PCB compatibility without layout modification.
• The 37PR1KLF is in active production status, providing supply continuity and long-term availability compared to the obsolete 3309P-1-102.
• Both components meet RoHS and REACH compliance requirements, with identical ECCN and HTSUS classifications.
• Dimensional compatibility is confirmed; the 0.20mm height difference (8.80mm vs 9.00mm) is within standard PCB assembly tolerances for rectangular through-hole components.

Frequently Asked Questions (FAQ)

Q: Can the 37PR1KLF directly replace the 3309P-1-102 without PCB modification?

A: Yes. Both components share identical mounting type (through hole), termination style (PC pins), and rectangular form factor. The 0.20mm height difference is within standard assembly tolerances and does not require PCB redesign.

Q: What is the significance of the tolerance difference (±25% vs ±20%)?

A: The 37PR1KLF tolerance is tighter, meaning resistance values will be closer to the nominal 1 kOhm specification. This provides improved adjustment precision and reduced performance variation across production batches. Applications requiring tighter tolerance control benefit from this specification.

Q: Are there any compliance or certification differences?

A: Both components are RoHS compliant and REACH unaffected. The 3309P-1-102 carries ROHS3 designation while the 37PR1KLF carries standard RoHS designation. Both meet the same environmental and regulatory requirements for industrial applications.

Q: Why is the 3309P-1-102 obsolete?

A: The Bourns 3309 series has been superseded by newer trimmer potentiometer designs. The TT Electronics 37 series represents current production technology with equivalent performance characteristics and improved supply availability.

Q: Are there any application limitations when substituting?

A: No application limitations exist for standard through-hole trimmer potentiometer applications. Both components operate identically within the specified resistance, power, and temperature ranges. Direct substitution is appropriate for all circuit designs using the 3309P-1-102.