UP2SC-121-R Equivalent & Substitute Parts Reference

Part Overview

The UP2SC-121-R is a 120 µH shielded wirewound inductor manufactured by Eaton - Electronics Division, designed for surface mount applications with a rated current of 600 mA and maximum DC resistance of 460 mOhm. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

The part operates across a temperature range of -25°C to 85°C and features a nonstandard package configuration with dimensions of 12.70mm × 10.00mm × 5.20mm (seated height). Due to its obsolete status, equivalent substitutes from active manufacturers are required to maintain supply chain reliability for applications requiring this specific inductance value and current rating.

Substiute Parts

UP2SC-121-R

Eaton - Electronics DivisionIn Stock: 1037UP2SC-121-R Datasheet

Current PartRFQ

SRR1005-121K

Bourns Inc.In Stock: 899SRR1005-121K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UP2SC-121-R is determined by strict equivalence across the following parameters:

Critical Matching Parameters:

• Inductance value: 120 µH (±10% tolerance)
• Current rating: 600 mA minimum
• DC resistance: 460 mOhm maximum
• Shielding configuration: Shielded
• Mounting technology: Surface mount
• Physical footprint: 12.70mm L × 10.00mm W × 5.20mm H (seated)

Acceptable Variations:

• Core material type (wirewound, drum core, or ferrite core configurations)
• Saturation current (Isat) values above the rated 600 mA
• Q factor at different test frequencies
• Self-resonant frequency (SRF) within acceptable operating range
• Operating temperature range extensions (wider ranges acceptable)
• Product status (active substitutes preferred for obsolete parts)

The SRR1005-121K from Bourns Inc. meets all critical matching parameters and qualifies as a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

The SRR1005-121K from Bourns Inc. is the qualified equivalent substitute for the obsolete UP2SC-121-R. Selection is based on the following engineering criteria:

Functional Equivalence: All critical electrical parameters match exactly: 120 µH inductance, 600 mA current rating, 460 mOhm maximum DC resistance, and shielded surface mount configuration. Physical footprint dimensions are identical, ensuring direct PCB layout compatibility without redesign.

Product Status and Supply Continuity: The UP2SC-121-R is classified as obsolete, creating supply risk. The SRR1005-121K maintains active production status with documented inventory availability (811 pieces in stock), ensuring long-term procurement reliability.

Compliance and Certifications: The SRR1005-121K carries ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. Both parts share identical ECCN (EAR99) and HTSUS (8504.50.4000) classifications.

Thermal Performance: The SRR1005-121K operating temperature range (-40°C to 125°C) exceeds the original part specification (-25°C to 85°C), providing enhanced thermal margin for demanding applications.

Packaging Considerations: The SRR1005-121K is supplied in Tape & Reel (TR) format, standard for automated assembly operations. Moisture sensitivity level remains at MSL 1 (Unlimited) for both parts.

Frequently Asked Questions (FAQ)

Q: Can the SRR1005-121K be used as a direct replacement for UP2SC-121-R without circuit modification?

A: Yes. The SRR1005-121K meets all critical electrical and mechanical specifications. Identical inductance (120 µH), current rating (600 mA), DC resistance (460 mOhm max), shielding configuration, and physical footprint (12.70 × 10.00 × 5.20 mm) enable direct substitution without circuit redesign or PCB layout changes.

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

A: The primary differences are: (1) Manufacturer - Eaton versus Bourns; (2) Product status - Obsolete versus Active; (3) Core construction - Wirewound versus Drum Core Wirewound; (4) Operating temperature range - UP2SC-121-R operates -25°C to 85°C, while SRR1005-121K operates -40°C to 125°C; (5) Saturation current - UP2SC-121-R at 1.03 A versus SRR1005-121K at 800 mA. All differences are compatible with the 600 mA rated application.

Q: Are there any compliance or regulatory differences?

A: The SRR1005-121K carries explicit ROHS3 compliance and REACH unaffected certification. The UP2SC-121-R compliance status is not specified in available documentation. Both parts share identical ECCN and HTSUS classifications. For applications requiring documented RoHS compliance, the SRR1005-121K is the preferred selection.

Q: What is the impact of the different saturation current values?

A: The UP2SC-121-R saturates at 1.03 A, while the SRR1005-121K saturates at 800 mA. Both values exceed the 600 mA rated current, providing adequate saturation margin. The SRR1005-121K's lower saturation point remains acceptable for this application and does not compromise performance at or below the 600 mA rating.

Q: How do the Q factor specifications compare?

A: The UP2SC-121-R specifies Q of 90 at 100 kHz, while the SRR1005-121K specifies Q of 30 at 796 kHz. These measurements occur at different frequencies, making direct comparison inappropriate. Both Q values are within acceptable ranges for shielded inductor applications at their respective test frequencies.

Q: Is the Tape & Reel packaging of the SRR1005-121K compatible with existing assembly processes?

A: Yes. Tape & Reel (TR) is the standard packaging format for automated surface mount assembly. The SRR1005-121K packaging is compatible with standard pick-and-place equipment and reflow soldering processes used in modern PCB manufacturing.

Q: What inventory considerations should be evaluated?

A: The UP2SC-121-R has 948 pieces in stock (obsolete status), while the SRR1005-121K has 811 pieces available (active status). For new designs or long-term production, the SRR1005-121K is recommended due to its active product status and ongoing manufacturing support.