ST5TP103 Equivalent & Substitute Parts Reference

Part Overview

The ST5TP103 is a 10 kOhms 0.25W (1/4W) gull wing surface mount trimmer potentiometer with cermet resistive material, 14-turn side adjustment, and rectangular form factor (6.00mm x 4.30mm). Manufactured by Vishay Beyschlag/Draloric/BC Components as part of the ST5 series, this component is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value
Resistance	10 kOhms
Power Rating	0.25W (1/4W)
Tolerance	±10%
Temperature Coefficient	±100ppm/°C
Number of Turns	14
Adjustment Type	Side Adjustment
Resistive Material	Cermet
Mounting Type	Surface Mount
Termination Style	Gull Wing
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the ST5TP103 are qualified based on the following critical parameters: resistance value (10 kOhms), power rating (0.25W), tolerance (±10%), temperature coefficient (±100ppm/°C), adjustment type (side adjustment), resistive material (cermet), mounting type (surface mount), and termination style (gull wing).

Substitutes are grouped into two categories:

Category A: Direct Electrical and Mechanical Equivalents — Parts maintaining identical or functionally equivalent specifications across all critical parameters, including 14-turn adjustment and gull wing termination.

Category B: Functional Equivalents with Minor Parameter Variations — Parts meeting core electrical specifications but with acceptable variations in physical dimensions or turn count (12 turns vs. 14 turns) that do not compromise circuit performance within the tolerance and temperature coefficient constraints.

Parameter Comparison

Part Number	Manufacturer	Resistance	Power (W)	Tolerance	Temp Coeff (ppm/°C)	Turns	Adjustment	Material	Mount Type	Termination	Size (mm)	Product Status	RoHS	MSL
ST5TP103	Vishay Beyschlag/Draloric/BC Components	10k	0.25	±10%	±100	14	Side	Cermet	Surface Mount	Gull Wing	6.00 x 4.30	Obsolete	Non-compliant	1
ST-5ETP103	Nidec Components Corporation	10k	0.25	±10%	±100	14	Side	Cermet	Surface Mount	Gull Wing	6.75 x 6.00	Active	RoHS3 Compliant	1
3269P-1-103G	Bourns Inc.	10k	0.25	±10%	±100	12	Side	Cermet	Surface Mount	Gull Wing	6.35 x 4.32	Active	Non-compliant	2
ST-5EP103	Nidec Components Corporation	10k	0.25	±10%	±100	14	Side	Cermet	Surface Mount	Gull Wing	6.75 x 6.00	Active	Not specified	1
ST-5ER103	Nidec Components Corporation	10k	0.25	±10%	±100	14	Side	Cermet	Surface Mount	Gull Wing	6.75 x 6.00	Active	RoHS3 Compliant	1
ST-5ETR103	Nidec Components Corporation	10k	0.25	±10%	±100	14	Side	Cermet	Surface Mount	Gull Wing	6.75 x 6.00	Active	RoHS3 Compliant	1
ST-5ETX103	Nidec Components Corporation	10k	0.25	±10%	±100	14	Side	Cermet	Surface Mount	Gull Wing	6.00 x 4.30	Active	RoHS3 Compliant	1
ST-5EX103	Nidec Components Corporation	10k	0.25	±10%	±100	14	Side	Cermet	Surface Mount	Gull Wing	6.00 x 4.30	Active	Not specified	1

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

ST-5ETX103 and ST-5EX103 are the preferred substitutes, maintaining identical physical dimensions (6.00mm x 4.30mm) and all electrical specifications including 14-turn adjustment. ST-5ETX103 carries RoHS3 compliance, making it suitable for applications requiring regulatory compliance. Both parts are manufactured by Nidec Components Corporation and are in active production status.

Secondary Substitutes (Electrical Equivalence with Dimensional Variation):

ST-5ETP103, ST-5EP103, ST-5ER103, and ST-5ETR103 maintain full electrical equivalence but feature larger physical dimensions (6.75mm x 6.00mm). These parts are suitable for applications where PCB layout accommodates the increased footprint. ST-5ER103 and ST-5ETR103 are RoHS3 compliant. All are in active production status.

Functional Substitute (Turn Count Variation):

3269P-1-103G (Bourns Trimpot® 3269 series) maintains electrical specifications but features 12-turn adjustment versus 14-turn. This part is suitable for applications where adjustment resolution requirements are less stringent. Moisture sensitivity level is MSL 2 (1 Year), requiring controlled storage conditions. RoHS compliance status is non-compliant.

Compliance Considerations:

For applications requiring RoHS3 compliance, select ST-5ETX103, ST-5ER103, or ST-5ETR103. For applications with no compliance requirements, all substitutes are functionally acceptable based on electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can ST-5ETX103 directly replace ST5TP103 without PCB modification?

A: Yes. ST-5ETX103 maintains identical physical dimensions (6.00mm x 4.30mm), electrical specifications (10 kOhms, 0.25W, ±10% tolerance, ±100ppm/°C), and 14-turn side adjustment. No PCB layout changes are required.

Q: What is the difference between ST-5ETP103 and ST-5ETX103?

A: Both parts are electrically identical (10 kOhms, 0.25W, 14-turn). The primary difference is physical size: ST-5ETP103 measures 6.75mm x 6.00mm, while ST-5ETX103 measures 6.00mm x 4.30mm (matching the original ST5TP103 footprint). Select based on available PCB space.

Q: Why does 3269P-1-103G have 12 turns instead of 14?

A: The 3269P-1-103G is a Bourns alternative with reduced turn count. Both 12-turn and 14-turn configurations maintain the same electrical specifications (10 kOhms, ±10% tolerance, ±100ppm/°C). The 12-turn design provides coarser adjustment resolution. Select based on application adjustment precision requirements.

Q: What does MSL 2 (1 Year) on 3269P-1-103G mean?

A: Moisture Sensitivity Level 2 indicates the component requires controlled storage at ≤30% relative humidity and must be used within one year of packaging. The original ST5TP103 and most Nidec substitutes carry MSL 1 (Unlimited), requiring no special moisture control.

Q: Are all substitutes available in tape and reel packaging?

A: No. ST-5ETP103 and ST-5ETR103 and ST-5ETX103 are available in tape and reel (TR) packaging. ST-5EP103, ST-5ER103, and ST-5EX103 are available in bulk packaging. 3269P-1-103G is available in tape and reel. Confirm packaging requirements with your procurement specification.

Q: Which substitute offers the best long-term availability?

A: ST-5ETX103, ST-5ER103, and ST-5ETR103 are all in active production status with Nidec Components Corporation, indicating sustained availability. The original ST5TP103 is obsolete and should not be specified for new designs.

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