UP2C-681-R Equivalent & Substitute Parts Reference

Part Overview

The UP2C-681-R is a 680 µH unshielded drum core wirewound inductor manufactured by Eaton Electronics Division, part of the UNI-PAC™ 2C series. This surface mount component is rated for 460 mA continuous current with a DC resistance of 1.774 Ohm and operates across the temperature range of -40°C to 85°C. The component is RoHS compliant and carries an MSL rating of 1 (Unlimited). As an active product with 687 pieces in stock, substitute parts are identified for applications requiring alternative electrical or thermal characteristics, or for supply chain flexibility.

Substiute Parts

UP2C-681-R

Eaton - Electronics DivisionIn Stock: 739UP2C-681-R Datasheet

Current PartRFQ

P0752.684NLT

Pulse ElectronicsIn Stock: 4920P0752.684NLT Datasheet

DirectRFQ

SDR1005-681KL

Bourns Inc.In Stock: 12238SDR1005-681KL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UP2C-681-R are qualified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Inductance value: 680 µH (exact match required)
• Inductance tolerance: ±20% or tighter
• Core type: Ferrite drum core wirewound construction
• Shielding: Unshielded
• Mounting: Surface mount, nonstandard package
• Inductance test frequency: 100 kHz

Secondary Compatibility Parameters:

• Current rating: Minimum 350 mA (acceptable for designs with margin)
• DC resistance: Maximum 2.6 Ohm (acceptable variation within thermal budget)
• Operating temperature: Minimum -40°C to 85°C overlap required
• RoHS and MSL compliance: Maintained across all substitutes

The identified substitutes P0752.684NLT and SDR1005-681KL meet these criteria with trade-offs in current rating and DC resistance that are acceptable for equivalent circuit performance within specified operating conditions.

Parameter Comparison

Engineering Selection Recommendations

UP2C-681-R (Eaton Electronics Division) remains the primary choice for applications requiring the highest current rating (460 mA) and lowest DC resistance (1.774 Ohm) within the specified temperature range of -40°C to 85°C. This part is active and RoHS compliant with unlimited MSL rating.

P0752.684NLT (Pulse Electronics) serves as a substitute for applications where extended operating temperature to 130°C is required, or where supply availability of the primary part is constrained. The 400 mA current rating and 2.17 Ohm maximum DC resistance represent acceptable trade-offs for designs with thermal margin. This part is ROHS3 compliant and REACH unaffected.

SDR1005-681KL (Bourns Inc.) is suitable for applications prioritizing tighter inductance tolerance (±10% versus ±20%) and lower profile height (5.00 mm versus 5.20 mm). The 350 mA current rating and 2.6 Ohm maximum DC resistance require verification against circuit thermal and current budgets. This part is ROHS3 compliant, REACH unaffected, and provides Q factor specification (72 @ 96 kHz) and self-resonant frequency (3 MHz).

All three parts maintain surface mount configuration, unshielded ferrite drum core construction, and MSL 1 rating. Selection should be based on specific application requirements for current capacity, temperature range, and physical constraints.

Frequently Asked Questions (FAQ)

Q: Can P0752.684NLT replace UP2C-681-R in all applications?

A: P0752.684NLT is functionally equivalent for circuits operating at or below 400 mA continuous current. The 460 mA rated part UP2C-681-R provides additional current margin. Both parts share identical 680 µH inductance, ±20% tolerance, unshielded construction, and surface mount configuration. The substitute offers extended temperature operation to 130°C versus 85°C maximum for the primary part.

Q: What are the physical compatibility considerations?

A: All three parts are surface mount with nonstandard packages and similar footprints. UP2C-681-R measures 12.90 mm x 9.40 mm x 5.20 mm (max height). P0752.684NLT measures 12.95 mm x 9.40 mm x 5.46 mm (max height). SDR1005-681KL measures 12.70 mm x 10.00 mm x 5.00 mm (max height). PCB layout verification is required when substituting, particularly for height-constrained applications.

Q: How does DC resistance affect circuit performance?

A: UP2C-681-R specifies 1.774 Ohm DC resistance. P0752.684NLT specifies 2.17 Ohm maximum, and SDR1005-681KL specifies 2.6 Ohm maximum. Higher DC resistance increases power dissipation and heat generation. For a 460 mA circuit, the primary part dissipates approximately 0.375 W, while SDR1005-681KL dissipates approximately 0.550 W. Thermal design must accommodate this difference.

Q: Are all parts RoHS compliant?

A: Yes. UP2C-681-R is RoHS compliant. P0752.684NLT is ROHS3 compliant. SDR1005-681KL is ROHS3 compliant. All parts carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no special storage or handling requirements.

Q: What is the difference in inductance test frequency?

A: UP2C-681-R and P0752.684NLT are tested at 100 kHz. SDR1005-681KL is tested at 1 kHz. This difference reflects different measurement methodologies but does not affect functional equivalence at the specified 680 µH inductance value. SDR1005-681KL additionally provides Q factor (72 @ 96 kHz) and self-resonant frequency (3 MHz) specifications.

Q: Can these parts be used interchangeably in high-temperature applications?

A: No. UP2C-681-R operates to 85°C maximum. For applications requiring operation above 85°C, P0752.684NLT (to 130°C) or SDR1005-681KL (to 125°C) are required. Verify that circuit design margins accommodate the higher DC resistance of substitute parts at elevated temperatures.