UP4B-151 Equivalent & Substitute Parts Reference

Part Overview

The UP4B-151 is a 150 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division, rated for 1.7 A continuous current with a maximum DC resistance of 239.2 mOhm. This component operates across the temperature range of -40°C to 85°C and is tested at 100 kHz. The UP4B-151 is classified as obsolete product status. Due to its obsolescence, equivalent and substitute parts from active manufacturers are necessary for ongoing design support, production continuity, and new project implementations.

Substiute Parts

UP4B-151

Eaton - Electronics DivisionIn Stock: 1006UP4B-151 Datasheet

Current PartRFQ

UP4B-151-R

Eaton - Electronics DivisionIn Stock: 6844UP4B-151-R Datasheet

DirectRFQ

B82477G4154M000

EPCOS - TDK ElectronicsIn Stock: 2080B82477G4154M000 Datasheet

SimilarRFQ

B82479A1154M000

EPCOS - TDK ElectronicsIn Stock: 1337B82479A1154M000 Datasheet

SimilarRFQ

CDRH125L125NP-151MC

Sumida America Components Inc.In Stock: 2187CDRH125L125NP-151MC Datasheet

SimilarRFQ

CDRR128NP-151MC

Sumida America Components Inc.In Stock: 961CDRR128NP-151MC Datasheet

SimilarRFQ

IDC7328ER151M

Vishay DaleIn Stock: 737IDC7328ER151M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UP4B-151 is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 150 µH (fixed requirement)
• Inductance tolerance: ±20% (fixed requirement)
• Core material: Ferrite (fixed requirement)
• Test frequency: 100 kHz (fixed requirement)
• Mounting type: Surface Mount (fixed requirement)

Secondary Compatibility Criteria:

• Current rating: Minimum 1.7 A (substitute must meet or exceed)
• DC resistance: Maximum 239.2 mOhm (substitute must not exceed)
• Saturation current: Minimum 3.0 A (substitute must meet or exceed)
• Operating temperature range: Must encompass or extend the -40°C to 85°C range
• Shielding configuration: Unshielded preferred; shielded variants acceptable if electrical parameters align

Substitute parts are grouped into two categories: direct equivalents (identical electrical and mechanical specifications with improved product status) and functional equivalents (matching core electrical parameters with acceptable variations in secondary characteristics).

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Direct Equivalent (Recommended Primary Choice):

The UP4B-151-R is the direct equivalent of the obsolete UP4B-151. This part maintains identical electrical specifications (150 µH, 1.7 A, 239.2 mOhm DCR) and mechanical form factor while offering active product status and ROHS3 compliance. The packaging format is Tape & Reel (TR), suitable for automated assembly. This part should be the first selection for direct replacement in existing designs.

Tier 2 - Functional Equivalents with Acceptable Parameter Variations:

The B82479A1154M000 (EPCOS - TDK Electronics) and IDC7328ER151M (Vishay Dale) are functionally equivalent unshielded inductors. Both maintain the 150 µH inductance and ±20% tolerance. The B82479A1154M000 offers extended temperature range (-55°C to 150°C) and the IDC7328ER151M provides -40°C to 125°C operation. Both have slightly higher DC resistance (250 mOhm) and lower saturation current (2.6 A) compared to the original part. These are suitable for applications where the original current rating of 1.7 A is not critical and where the slightly higher DCR is acceptable.

Tier 3 - Shielded Alternatives:

The B82477G4154M000 (EPCOS - TDK Electronics) and CDRR128NP-151MC (Sumida America Components Inc.) are shielded drum core inductors with 150 µH inductance. The B82477G4154M000 has lower current rating (1.42 A) and lower saturation current (1.7 A), making it unsuitable for applications requiring the full 1.7 A rating. The CDRR128NP-151MC maintains 1.6 A current rating with 238 mOhm DCR, closely matching the original specifications while providing shielding benefits. The CDRH125L125NP-151MC (Sumida America Components Inc.) is a shielded alternative with reduced current rating (1.4 A) and higher DCR (271 mOhm), suitable only for lower-current applications.

Compliance Considerations:

All active substitute parts listed are ROHS3 compliant, addressing regulatory requirements that the obsolete UP4B-151 does not meet. Selection should prioritize parts with active product status to ensure long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q1: Can I use UP4B-151-R as a direct replacement for UP4B-151?

A: Yes. The UP4B-151-R is the direct equivalent with identical electrical and mechanical specifications. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). The packaging format is Tape & Reel (TR) instead of the original format, but electrical performance is identical.

Q2: What are the key differences between unshielded and shielded substitute options?

A: Unshielded inductors (UP4B-151-R, B82479A1154M000, IDC7328ER151M) have lower profile and cost but may exhibit higher electromagnetic coupling to surrounding components. Shielded inductors (B82477G4154M000, CDRR128NP-151MC, CDRH125L125NP-151MC) provide electromagnetic isolation but have larger physical dimensions and higher cost. Selection depends on circuit layout and EMI requirements.

Q3: Why do some substitutes have lower current ratings than the original UP4B-151?

A: The B82477G4154M000 (1.42 A) and CDRH125L125NP-151MC (1.4 A) are designed for different application profiles. These parts are listed as functional alternatives but are not recommended for applications requiring the full 1.7 A continuous current rating of the original part. Verify application current requirements before selection.

Q4: What does DC Resistance (DCR) variation mean for my circuit?

A: DC Resistance affects power dissipation and voltage drop across the inductor. The original UP4B-151 has 239.2 mOhm maximum DCR. Substitutes with higher DCR (such as CDRH125L125NP-151MC at 271 mOhm) will dissipate more power. Substitutes with lower DCR (such as B82477G4154M000 at 225 mOhm) will dissipate less power. Verify that your circuit design can accommodate the DCR value of the selected substitute.

Q5: Are all substitute parts tested at 100 kHz like the original?

A: Yes. All substitute parts listed are tested at 100 kHz inductance frequency, matching the original UP4B-151 test condition. This ensures consistent inductance measurement methodology across all parts.

Q6: What is the significance of saturation current (Isat)?

A: Saturation current indicates the DC current level at which the inductor's inductance begins to degrade significantly. The original UP4B-151 has Isat of 3.0 A. Substitutes with lower Isat values (such as B82477G4154M000 at 1.7 A) will experience inductance degradation at lower current levels. Ensure the substitute's Isat exceeds your circuit's maximum expected DC current.

Q7: Can I use a substitute with extended temperature range in place of the original?

A: Yes, if your circuit operates within the original temperature range (-40°C to 85°C). Substitutes with extended ranges (such as B82479A1154M000 at -55°C to 150°C) are backward compatible. However, verify that other circuit components also support the extended range if you intend to operate outside the original specification.

Q8: What packaging format should I specify for automated assembly?

A: All active substitute parts listed are available in Tape & Reel (TR) packaging format, suitable for automated pick-and-place assembly. The original UP4B-151 packaging format is not specified in the data; UP4B-151-R in TR format is the recommended choice for modern manufacturing processes.

Q9: Are there any AEC-Q200 rated alternatives?

A: The CDRH125L125NP-151MC (Sumida America Components Inc.) carries AEC-Q200 rating, indicating automotive-grade qualification. This part is suitable for automotive and high-reliability applications requiring formal qualification standards.

Q10: How do I verify compatibility before committing to a substitute part?

A: Compare the following parameters against your circuit requirements: inductance value (150 µH), current rating (minimum 1.7 A for full compatibility), DC resistance (maximum 239.2 mOhm preferred), saturation current (minimum 3.0 A preferred), and operating temperature range. Verify that the substitute meets or exceeds all critical parameters for your specific application.