UP3B-151-R Equivalent & Substitute Parts

Part Overview

The UP3B-151-R is a 150 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 1.2 A continuous current with a maximum DC resistance of 296 mOhm and operates across the temperature range of -40°C to 85°C. The part is RoHS Compliant and carries an MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions. The UP3B-151-R is currently Active in product status and available in Tape & Reel packaging with 1032 pieces in stock.

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain disruptions, or when enhanced electrical performance characteristics are required within the same functional category.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Inductance	150	µH	Primary functional specification; must match exactly
Current Rating	1.2	A	Minimum continuous current capacity; substitute must equal or exceed
DC Resistance (DCR)	296	mOhm Max	Power loss and thermal performance; lower values preferred
Saturation Current (Isat)	1.4	A	Maximum current before inductance degradation; substitute must equal or exceed
Core Type	Ferrite Drum Core, Unshielded	—	Electromagnetic properties and EMI characteristics; must match
Tolerance	±20%	%	Inductance accuracy; tighter tolerance acceptable
Operating Temperature	-40 to 85	°C	Environmental operating range; substitute must cover or exceed
Mounting Type	Surface Mount	—	PCB assembly compatibility; must match
Package	Nonstandard	—	Physical footprint and height; dimensional compatibility required
RoHS Status	RoHS Compliant	—	Regulatory compliance; substitute must maintain or exceed compliance level

Substitute Part Grouping Explanation

Substitution eligibility for the UP3B-151-R is determined by strict adherence to the following electrical and mechanical parameters:

Primary Matching Criteria (Non-Negotiable):

Inductance value: 150 µH at 100 kHz test frequency
Core type: Ferrite drum core, unshielded construction
Mounting type: Surface mount
Package classification: Nonstandard

Secondary Performance Criteria (Substitute Must Meet or Exceed):

Current rating: Minimum 1.2 A continuous
Saturation current (Isat): Minimum 1.4 A
DC resistance: 296 mOhm maximum (lower values acceptable)
Operating temperature range: Must cover -40°C to 85°C minimum
Inductance tolerance: ±20% or tighter

Compliance Criteria:

RoHS compliance status: Must be RoHS Compliant or higher classification
Moisture sensitivity: MSL 1 (Unlimited) preferred
Packaging: Tape & Reel format

The SDR1806-151KL from Bourns Inc. meets all primary and secondary criteria and qualifies as a direct substitute.

Parameter Comparison

Parameter	UP3B-151-R (Eaton)	SDR1806-151KL (Bourns)	Compatibility Assessment
Inductance	150 µH	150 µH	Exact match
Inductance Tolerance	±20%	±10%	Substitute offers tighter tolerance
Current Rating	1.2 A	1.4 A	Substitute exceeds requirement by 0.2 A
Saturation Current (Isat)	1.4 A	2.6 A	Substitute exceeds requirement by 1.2 A
DC Resistance (DCR)	296 mOhm Max	270 mOhm Max	Substitute provides 26 mOhm lower resistance
Core Type	Ferrite Drum Core, Unshielded	Ferrite Drum Core, Unshielded	Exact match
Operating Temperature Range	-40°C to 85°C	-40°C to 125°C	Substitute extends upper limit by 40°C
Mounting Type	Surface Mount	Surface Mount	Exact match
Package / Case	Nonstandard	Nonstandard	Both nonstandard; dimensional verification required
Size / Dimension (L x W)	0.760" x 0.520" (19.30mm x 13.21mm)	0.720" x 0.551" (18.30mm x 14.00mm)	Minor dimensional variation; PCB layout compatibility assessment needed
Height - Seated (Max)	0.268" (6.80mm)	0.272" (6.90mm)	Negligible difference of 0.04mm
RoHS Status	RoHS Compliant	ROHS3 Compliant	Substitute meets higher compliance standard
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Exact match
Packaging Format	Tape & Reel (TR)	Tape & Reel (TR)	Exact match
Product Status	Active	Active	Both actively manufactured

Engineering Selection Recommendations

Substitution Feasibility: Approved

The SDR1806-151KL qualifies as a direct substitute for the UP3B-151-R based on the following engineering assessment:

Electrical Compatibility: The SDR1806-151KL maintains the identical 150 µH inductance specification at 100 kHz test frequency. The substitute provides enhanced current handling capacity (1.4 A vs. 1.2 A) and significantly improved saturation current performance (2.6 A vs. 1.4 A), reducing the risk of inductance collapse under transient current conditions. The 26 mOhm reduction in maximum DC resistance results in lower power dissipation and improved thermal performance.

Thermal Performance: The extended operating temperature range of the SDR1806-151KL (-40°C to 125°C) provides additional margin beyond the UP3B-151-R specification (-40°C to 85°C), supporting applications requiring higher ambient temperature tolerance.

Regulatory Compliance: Both parts maintain RoHS compliance. The SDR1806-151KL carries ROHS3 Compliant designation, representing a higher compliance classification. Both parts are MSL 1 (Unlimited), eliminating moisture sensitivity concerns for storage and handling.

Physical Integration: Dimensional variations between the two parts are minor. The SDR1806-151KL measures 0.720" L x 0.551" W (18.30mm x 14.00mm) compared to the UP3B-151-R at 0.760" L x 0.520" W (19.30mm x 13.21mm). The length is 0.04" shorter and the width is 0.031" wider. Seated height difference is negligible at 0.04mm. PCB layout verification is required to confirm pad spacing and clearance compatibility for the specific application.

Supply Chain Status: Both parts are Active in product status with current manufacturing availability. The SDR1806-151KL has 1395 pieces in stock compared to 1032 pieces for the UP3B-151-R.

Frequently Asked Questions (FAQ)

Q: Can the SDR1806-151KL be used as a direct replacement for the UP3B-151-R without circuit modification?

A: The SDR1806-151KL is electrically compatible as a substitute. The identical 150 µH inductance and ferrite drum core construction ensure functional equivalence. However, the minor dimensional differences (length 0.04" shorter, width 0.031" wider) require verification of PCB pad spacing and component clearance. No circuit modifications are necessary if physical placement is compatible.

Q: What are the key differences between these two inductors?

A: The primary differences are: (1) Current rating: SDR1806-151KL rated 1.4 A vs. UP3B-151-R at 1.2 A; (2) Saturation current: SDR1806-151KL at 2.6 A vs. UP3B-151-R at 1.4 A; (3) DC resistance: SDR1806-151KL at 270 mOhm max vs. UP3B-151-R at 296 mOhm max; (4) Operating temperature: SDR1806-151KL extends to 125°C vs. UP3B-151-R at 85°C; (5) Inductance tolerance: SDR1806-151KL at ±10% vs. UP3B-151-R at ±20%; (6) Physical dimensions: Minor length and width variations.

Q: Does the tighter inductance tolerance of the SDR1806-151KL affect circuit performance?

A: The SDR1806-151KL provides ±10% tolerance compared to the UP3B-151-R at ±20%. Tighter tolerance improves inductance accuracy and reduces circuit performance variation. This is beneficial for applications requiring precise inductance values and is not detrimental to compatibility.

Q: Are there any thermal performance advantages to using the SDR1806-151KL?

A: Yes. The SDR1806-151KL has 26 mOhm lower maximum DC resistance (270 mOhm vs. 296 mOhm), resulting in reduced I²R power dissipation. Additionally, the higher saturation current rating (2.6 A vs. 1.4 A) provides greater margin before inductance degradation occurs, supporting improved thermal stability under peak current conditions.

Q: What compliance certifications apply to both parts?

A: Both the UP3B-151-R and SDR1806-151KL are RoHS Compliant. The SDR1806-151KL carries the higher ROHS3 Compliant designation. Both parts have MSL 1 (Unlimited) moisture sensitivity ratings, indicating no moisture-related handling restrictions. Both are packaged in Tape & Reel format suitable for automated assembly.

Q: Are there any frequency-dependent performance differences?

A: The UP3B-151-R does not provide self-resonant frequency or Q factor data. The SDR1806-151KL specifies Q of 23 at 796 kHz and self-resonant frequency of 5 MHz. For applications operating below 1 MHz, the SDR1806-151KL provides documented frequency response characteristics. Both parts are tested at 100 kHz for inductance specification.

Q: What should be verified before implementing the SDR1806-151KL as a substitute?

A: Verification steps include: (1) Confirm PCB pad spacing accommodates the SDR1806-151KL dimensions (0.720" L x 0.551" W); (2) Verify component clearance with adjacent parts, particularly in the width direction where the substitute is 0.031" wider; (3) Validate that the application current profile does not exceed 1.4 A continuous rating; (4) Confirm operating temperature environment remains within -40°C to 125°C range; (5) Review circuit schematic to ensure no design-specific dependencies on the UP3B-151-R's ±20% tolerance exist.

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