UP3B-680-R Equivalent & Substitute Parts Reference

Part Overview

The UP3B-680-R is a 68 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division, part of the UNI-PAC™ series. This surface mount component is rated for 1.6 A continuous current with a maximum DC resistance of 155.8 mOhm 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).

Substitute parts are identified when equivalent inductance values, core materials, mounting types, and electrical performance parameters align within acceptable tolerances. Alternative components may be required due to inventory availability, extended temperature range requirements, improved DC resistance characteristics, or specific shielding requirements for electromagnetic compatibility in circuit applications.

Substiute Parts

UP3B-680-R

Eaton - Electronics DivisionIn Stock: 893UP3B-680-R Datasheet

Current PartRFQ

SDR1806-680ML

Bourns Inc.In Stock: 3610SDR1806-680ML Datasheet

DirectRFQ

SLF12565T-680M2R0-PF

TDK CorporationIn Stock: 3540SLF12565T-680M2R0-PF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UP3B-680-R are classified based on alignment with the following critical parameters:

Primary Matching Criteria:

• Inductance value of 68 µH at 100 kHz test frequency
• Ferrite drum core, wirewound construction
• Surface mount package configuration
• Tolerance of ±20%
• Operating temperature range that encompasses or exceeds -40°C to 85°C

Secondary Performance Criteria:

• Current rating equal to or greater than 1.6 A
• DC resistance at or below 155.8 mOhm (lower values indicate improved efficiency)
• Saturation current (Isat) sufficient for application peak current demands
• RoHS and REACH compliance status

Acceptable Variations:

• Shielded versus unshielded construction (affects EMI performance and board layout)
• Slight dimensional differences within nonstandard package classifications
• Extended temperature ranges beyond the original specification
• Improved DC resistance characteristics
• Enhanced saturation current ratings

Substitutes that deviate from these criteria are not electrically or mechanically compatible with the UP3B-680-R in its intended application.

Parameter Comparison

Engineering Selection Recommendations

SDR1806-680ML (Bourns Inc.) - Direct Substitute

The SDR1806-680ML is classified as a direct manufacturer substitute. It maintains the same 68 µH inductance, ±20% tolerance, and ferrite drum core construction as the UP3B-680-R. The Bourns component offers improved electrical performance with a current rating of 2.1 A (versus 1.6 A) and reduced DC resistance of 130 mOhm Max (versus 155.8 mOhm Max). The extended operating temperature range of -40°C to 125°C provides additional thermal margin. Both components are packaged in Tape & Reel format and maintain Active product status with ROHS3 compliance. The SDR1806-680ML is suitable for direct replacement in applications where the original UP3B-680-R is specified, with the added benefit of improved current handling and lower power dissipation.

SLF12565T-680M2R0-PF (TDK Corporation) - Similar Substitute with Constraints

The SLF12565T-680M2R0-PF is classified as a similar substitute with specific application constraints. This TDK component matches the 68 µH inductance and ±20% tolerance but introduces a shielded construction versus the unshielded design of the UP3B-680-R. The shielded configuration provides superior EMI containment, beneficial in noise-sensitive applications. The SLF12565T-680M2R0-PF delivers the highest current rating at 2.4 A and the lowest DC resistance at 94.4 mOhm Max, resulting in minimal power loss. However, the component carries a "Not For New Designs" product status, indicating that TDK has discontinued active development and support for this part. The operating temperature range of -20°C to 105°C is narrower than the original specification at the lower end (-20°C versus -40°C). The inductance test frequency of 1 kHz differs from the standard 100 kHz used for the UP3B-680-R and SDR1806-680ML, which may affect inductance accuracy in high-frequency applications. Use of this substitute is restricted to legacy system maintenance or applications where the shielded construction is mandatory and the narrower temperature range is acceptable.

Frequently Asked Questions (FAQ)

Q1: Can the SDR1806-680ML directly replace the UP3B-680-R without circuit modifications?

A: Yes. Both components share identical inductance (68 µH), tolerance (±20%), core type (ferrite drum core wirewound), and mounting configuration (surface mount). The SDR1806-680ML offers superior electrical performance with higher current rating (2.1 A vs. 1.6 A) and lower DC resistance (130 mOhm vs. 155.8 mOhm). No circuit modifications are required for direct substitution.

Q2: What is the significance of the shielded construction in the SLF12565T-680M2R0-PF?

A: Shielded inductors contain electromagnetic fields within the component, reducing radiated EMI that could interfere with adjacent circuit elements. The unshielded UP3B-680-R and SDR1806-680ML allow magnetic field radiation into the surrounding PCB area. Selection between shielded and unshielded depends on circuit layout density and EMI sensitivity. Shielded components typically occupy more board space and may have different resonant characteristics.

Q3: Why does the SLF12565T-680M2R0-PF have a "Not For New Designs" status?

A: This designation indicates that TDK has transitioned this part to end-of-life status and no longer actively supports new product development with this component. While existing inventory may be available, TDK recommends using alternative current-generation inductors for new circuit designs. This status does not affect the electrical performance of existing stock but signals reduced long-term availability and potential supply discontinuation.

Q4: How do the different inductance test frequencies (100 kHz vs. 1 kHz) affect substitution decisions?

A: Inductance values are frequency-dependent due to core material properties. The UP3B-680-R and SDR1806-680ML are both characterized at 100 kHz, ensuring consistent inductance measurement methodology. The SLF12565T-680M2R0-PF is characterized at 1 kHz, which may result in slightly different measured inductance values at operating frequencies. For applications operating near 100 kHz, the UP3B-680-R and SDR1806-680ML provide more accurate inductance prediction. The 1 kHz test frequency of the TDK component is suitable for lower-frequency applications but introduces uncertainty in high-frequency circuits.

Q5: What is the impact of DC resistance differences on circuit performance?

A: DC resistance directly affects power dissipation and thermal performance. The UP3B-680-R dissipates more power (155.8 mOhm) than the SDR1806-680ML (130 mOhm) or SLF12565T-680M2R0-PF (94.4 mOhm) at identical current levels. Lower DC resistance reduces heat generation, improving component reliability and reducing thermal stress on the PCB. In current-limited applications or high-ambient-temperature environments, the lower-resistance substitutes provide thermal margin. In low-current applications, the difference is negligible.

Q6: Are all three components compatible with the same PCB footprint?

A: All three components are surface mount, nonstandard package inductors with similar physical dimensions. The UP3B-680-R measures 0.760" L × 0.520" W × 0.268" H; the SDR1806-680ML measures 0.720" L × 0.551" W × 0.272" H; the SLF12565T-680M2R0-PF measures 0.492" L × 0.492" W × 0.270" H. While dimensions are comparable, the SLF12565T-680M2R0-PF is significantly smaller. PCB footprint compatibility must be verified before substitution. Consult component datasheets for exact land pattern requirements.

Q7: Which substitute is recommended for applications requiring extended temperature operation?

A: The SDR1806-680ML supports -40°C to 125°C, providing the widest temperature range and exceeding the original UP3B-680-R specification (-40°C to 85°C). The SLF12565T-680M2R0-PF operates from -20°C to 105°C, which is narrower at the low end. For applications requiring operation below -20°C or above 85°C, the SDR1806-680ML is the appropriate choice.

Q8: What packaging format differences exist between these substitutes?

A: The UP3B-680-R and SDR1806-680ML are supplied in Tape & Reel (TR) format, suitable for automated assembly processes. The SLF12565T-680M2R0-PF is supplied in Cut Tape (CT) & Digi-Reel® format, which may require different handling and feeder compatibility on assembly equipment. Verify packaging compatibility with your manufacturing process before selecting a substitute.