UP3B-3R3-R Equivalent & Substitute Parts

Part Overview

The UP3B-3R3-R is a 3.3 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 8 A continuous current with a maximum DC resistance of 8.3 mOhm and operates across the temperature range of -40°C to 85°C. The part is RoHS Compliant and carries Active product status. Equivalent and substitute parts are identified when design requirements permit tolerance of minor variations in electrical performance while maintaining functional compatibility within the specified application parameters.

Substiute Parts

UP3B-3R3-R

Eaton - Electronics DivisionIn Stock: 957UP3B-3R3-R Datasheet

Current PartRFQ

SDR1806-3R3ML

Bourns Inc.In Stock: 1672SDR1806-3R3ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UP3B-3R3-R with the SDR1806-3R3ML is determined by alignment of the following critical parameters:

Matching Parameters:

• Inductance value: 3.3 µH (both parts)
• Inductance tolerance: ±20% (both parts)
• Core material: Ferrite, unshielded drum core wirewound construction (both parts)
• Mounting type: Surface Mount (both parts)
• Inductance test frequency: 100 kHz (both parts)
• Moisture Sensitivity Level: 1 (Unlimited) (both parts)
• RoHS compliance status: Both parts meet environmental standards

Allowable Variations: Substitution is valid when the application circuit tolerates the following parameter differences: current rating variance (8 A vs. 7.6 A), DC resistance increase (8.3 mOhm to 9.8 mOhm maximum), saturation current difference (9.3 A vs. 17 A), and operating temperature range extension (-40°C to 125°C vs. -40°C to 85°C). Physical dimensions vary slightly between the two packages.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection: The UP3B-3R3-R remains the specified component when the application circuit requires the exact 8 A current rating and 8.3 mOhm maximum DC resistance. This part is Active status with RoHS Compliant certification and maintains the -40°C to 85°C operating window.

Substitute Part Selection: The SDR1806-3R3ML (Bourns Inc.) is a valid substitute when circuit design permits operation at 7.6 A continuous current and accepts the increased DC resistance of 9.8 mOhm maximum. The substitute part is Active status with ROHS3 Compliant certification and extends the operating temperature range to -40°C to 125°C. The substitute part is suitable for applications requiring enhanced thermal performance or extended temperature operation within the specified inductance and tolerance parameters.

Compliance Considerations: Both parts meet environmental compliance requirements. The substitute part carries ROHS3 Compliant status, representing alignment with the most current regulatory standard. Both parts carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

Frequently Asked Questions (FAQ)

Q: Can the SDR1806-3R3ML replace the UP3B-3R3-R in all applications?

A: The SDR1806-3R3ML is a valid substitute only when the application circuit tolerates a 0.4 A reduction in continuous current rating (from 8 A to 7.6 A) and an increase in DC resistance from 8.3 mOhm to 9.8 mOhm maximum. Verify that the circuit design does not require the full 8 A rating or depend on the lower DC resistance specification.

Q: What are the physical package differences?

A: The UP3B-3R3-R measures 0.760" L x 0.520" W x 0.268" H (19.30mm x 13.21mm x 6.80mm). The SDR1806-3R3ML measures 0.720" L x 0.551" W x 0.272" H (18.30mm x 14.00mm x 6.90mm). Both are nonstandard packages. Verify PCB layout and component placement clearances before substitution.

Q: Are there temperature range implications for substitution?

A: The UP3B-3R3-R operates from -40°C to 85°C. The SDR1806-3R3ML operates from -40°C to 125°C. If the application operates only within the -40°C to 85°C range, both parts are functionally equivalent in this regard. If extended high-temperature operation is required, the substitute part provides additional thermal margin.

Q: Do both parts meet the same regulatory standards?

A: Both parts are RoHS compliant. The UP3B-3R3-R carries RoHS Compliant status. The SDR1806-3R3ML carries ROHS3 Compliant status, representing compliance with the updated regulatory standard. Both parts carry Moisture Sensitivity Level 1 (Unlimited).

Q: What is the inductance tolerance for both parts?

A: Both the UP3B-3R3-R and SDR1806-3R3ML carry ±20% inductance tolerance at 100 kHz test frequency. The 3.3 µH nominal value is identical for both parts.

Q: How do the saturation current ratings differ?

A: The UP3B-3R3-R has a saturation current (Isat) of 9.3 A. The SDR1806-3R3ML has a saturation current of 17 A. The substitute part provides significantly higher saturation margin, which may be beneficial in applications subject to transient current spikes.