UP4T-100-R Equivalent & Substitute Parts

Part Overview

The UP4T-100-R is a 10 µH unshielded wirewound inductor manufactured by Eaton - Electronics Division, rated for 6.8 A continuous current with a maximum DC resistance of 18 mOhm. This component is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support, maintenance, and production continuity. The part is packaged as a through-hole radial vertical cylinder with four leads and operates at an inductance test frequency of 100 kHz.

Substiute Parts

UP4T-100-R

Eaton - Electronics DivisionIn Stock: 1001UP4T-100-R Datasheet

Current PartRFQ

P1252.103NLT

Pulse ElectronicsIn Stock: 1939P1252.103NLT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UP4T-100-R is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Inductance value: 10 µH (exact match required)
• Inductance tolerance: ±20% (must be equal or tighter)
• Current rating: minimum 6.8 A continuous (substitute must meet or exceed)
• DC resistance: maximum 18 mOhm (substitute must not exceed this value)
• Saturation current: minimum 11.5 A (substitute must meet or exceed)
• Shielding configuration: unshielded (must match)
• Wirewound type: required (must match)

Mechanical and Environmental Criteria:

• Inductance test frequency: 100 kHz (must match)
• Moisture sensitivity: MSL 1 (must match or be superior)
• ECCN and HTSUS classifications: must align for regulatory compliance

The substitute part P1252.103NLT from Pulse Electronics meets the electrical inductance and tolerance requirements but operates under different mounting and packaging constraints. This part is classified as active product status, providing long-term availability assurance compared to the obsolete UP4T-100-R.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility Assessment:

The P1252.103NLT presents a partial electrical and mechanical substitution path for the UP4T-100-R with the following constraints:

Electrical Deviations:

• Continuous current rating: 6 A (substitute) versus 6.8 A (original). The substitute operates 0.8 A below the original specification, representing an 11.8% reduction in current capacity.
• Saturation current: 10 A (substitute) versus 11.5 A (original). The substitute saturates 1.5 A earlier than the original.
• DC resistance: 26 mOhm (substitute) versus 18 mOhm (original). The substitute exhibits 44% higher resistance, resulting in increased power dissipation and heat generation.

Mechanical Differences:

• Mounting type: Surface mount (substitute) versus through-hole (original). This represents a fundamental package incompatibility requiring PCB redesign.

Compliance and Availability:

• The substitute part is classified as active product status, ensuring long-term availability and supply chain continuity.
• RoHS3 compliance is documented for the substitute, meeting modern environmental regulations.
• Operating temperature range (-40°C ~ 130°C) is specified for the substitute, providing defined thermal operating boundaries.

Selection Criteria: Substitution of UP4T-100-R with P1252.103NLT is viable only in applications where: (1) continuous current demand does not exceed 6 A, (2) saturation margin requirements permit 10 A operation, (3) increased DC resistance and associated power dissipation are acceptable, and (4) PCB redesign to accommodate surface-mount packaging is feasible. Direct pin-for-pin replacement is not possible due to mounting type incompatibility.

Frequently Asked Questions (FAQ)

Q1: Can P1252.103NLT directly replace UP4T-100-R in existing through-hole PCB designs?

No. The P1252.103NLT is a surface-mount component, while the UP4T-100-R is through-hole mounted. Direct PCB substitution is not possible without redesign of the PCB footprint and routing.

Q2: What is the impact of the 26 mOhm DC resistance in P1252.103NLT compared to the 18 mOhm specification of UP4T-100-R?

The 44% increase in DC resistance results in proportionally higher power dissipation. At 6 A continuous current, the P1252.103NLT dissipates 0.936 W (6² × 0.026), compared to 0.648 W for the UP4T-100-R (6² × 0.018). This 0.288 W difference requires thermal management evaluation in the application circuit.

Q3: Are the inductance values and tolerances identical between these parts?

Yes. Both parts are specified at 10 µH with ±20% tolerance, tested at 100 kHz. Inductance compatibility is confirmed.

Q4: What is the significance of the current rating difference (6.8 A versus 6 A)?

The UP4T-100-R supports 6.8 A continuous current, while P1252.103NLT is rated for 6 A. Applications requiring current above 6 A cannot use the substitute without exceeding its continuous current specification. The saturation current difference (11.5 A versus 10 A) further reduces the operational margin.

Q5: Does the P1252.103NLT offer any advantages over the UP4T-100-R?

The P1252.103NLT is classified as active product status, ensuring ongoing availability and supply chain support. The UP4T-100-R is obsolete. The substitute also provides documented operating temperature range (-40°C ~ 130°C) and RoHS3 compliance, meeting modern regulatory requirements.

Q6: What is the moisture sensitivity level (MSL) for both parts?

Both parts are specified as MSL 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

Q7: Can these parts be used interchangeably in new designs?

No. New designs should not use the obsolete UP4T-100-R. If the electrical specifications of P1252.103NLT (6 A continuous, 10 A saturation, 26 mOhm DCR) are acceptable for the application, the surface-mount package must be accommodated in the PCB design. Alternative through-hole 10 µH inductors with equivalent or superior electrical ratings should be evaluated if through-hole mounting is required.