B78148T1122K9 Equivalent & Substitute Parts

Part Overview

The B78148T1122K9 is a 1.2 µH unshielded drum core wirewound inductor manufactured by EPCOS - TDK Electronics, rated for 610 mA with a maximum DC resistance of 250mOhm. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part operates across the temperature range of -55°C to 125°C and is ROHS3 compliant.

Substiute Parts

B78148T1122K9

EPCOS - TDK ElectronicsIn Stock: 1024B78148T1122K9 Datasheet

Current PartRFQ

2020R-26J

API Delevan Inc.In Stock: 10532020R-26J Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 2020R-26J from API Delevan Inc. qualifies as a substitute based on the following critical parameters:

• Inductance value matches at 1.2 µH
• Operating temperature range is identical: -55°C to 125°C
• Through hole mounting type is maintained
• Current rating of 700 mA exceeds the original 610 mA requirement
• Both components are unshielded
• Both maintain ROHS3 compliance and REACH unaffected status

The substitute part demonstrates improved electrical performance with tighter inductance tolerance (±5% versus ±10%) and higher Q factor (60 @ 7.9MHz versus 40 @ 7.96MHz). The increased DC resistance (400mOhm Max versus 250mOhm Max) and different core material (iron toroidal versus ferrite drum) represent design trade-offs that must be evaluated within specific circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The 2020R-26J is an active product with confirmed availability, addressing the obsolescence of the B78148T1122K9. Both components maintain identical compliance certifications (ROHS3 and REACH unaffected status), supporting regulatory requirements across applications.

Selection between these parts depends on circuit-specific requirements. The B78148T1122K9 offers lower DC resistance and higher self-resonant frequency, beneficial for low-loss applications and higher frequency operation. The 2020R-26J provides superior current headroom (700 mA versus 610 mA), tighter inductance tolerance, and higher Q factor, making it suitable for applications requiring improved performance margins and precision inductance values.

Physical dimensions differ between the drum core (0.130" diameter, 0.386" height) and toroidal (0.200" L x 0.100" W, 0.230" height) packages, requiring PCB layout verification before substitution.

Frequently Asked Questions (FAQ)

Q: Can the 2020R-26J directly replace the B78148T1122K9 in all applications?

A: Direct replacement requires verification of three factors: (1) PCB layout accommodation for different package dimensions, (2) circuit tolerance of increased DC resistance (400mOhm versus 250mOhm), and (3) acceptance of different core material characteristics (iron toroidal versus ferrite drum). The identical inductance value and operating temperature range support functional compatibility, but application-specific circuit analysis is necessary.

Q: What is the impact of the different core materials?

A: The ferrite drum core in the B78148T1122K9 and iron toroidal core in the 2020R-26J exhibit different frequency response characteristics. The B78148T1122K9 maintains a higher self-resonant frequency (170MHz versus 130MHz), while the 2020R-26J achieves higher Q factor (60 versus 40 @ ~7.9MHz). Core material selection affects EMI characteristics and frequency-dependent performance.

Q: Does the higher current rating of the 2020R-26J affect compatibility?

A: The 700 mA rating of the 2020R-26J exceeds the 610 mA requirement of the B78148T1122K9, providing additional current margin. This represents an improvement for applications operating near the original current limit. No derating is required for circuits designed within the original 610 mA specification.

Q: How do the inductance tolerances affect circuit performance?

A: The B78148T1122K9 specifies ±10% tolerance, while the 2020R-26J offers ±5% tolerance. Applications requiring tighter inductance control benefit from the improved tolerance of the substitute part. Circuits designed with ±10% tolerance margin accommodate both components without modification.

Q: Are there packaging or mounting considerations?

A: Both components use through-hole mounting, but physical dimensions differ significantly. The B78148T1122K9 uses a radial vertical cylinder package (0.130" diameter, 0.386" height), while the 2020R-26J uses a toroidal package (0.200" L x 0.100" W, 0.230" height). PCB layout and component spacing must be verified before substitution.