LHL10TB121KB Equivalent & Substitute Parts

Part Overview

The LHL10TB121KB is a 120 µH unshielded inductor manufactured by Taiyo Yuden, rated for 1 A maximum current with a DC resistance of 250mOhm maximum. This through-hole radial component features a ferrite core and operates across a temperature range of -25°C to 105°C. The product is classified as obsolete, necessitating identification of equivalent substitute components that maintain functional compatibility while ensuring continued availability and supply chain reliability.

Substiute Parts

LHL10TB121KB

Taiyo YudenIn Stock: 1119LHL10TB121KB Datasheet

Current PartRFQ

1110-121K-RC

Bourns Inc.In Stock: 11571110-121K-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LHL10TB121KB is based on the following critical parameters that must align across candidate parts:

Primary Matching Criteria:

• Inductance value: 120 µH with ±10% tolerance
• Core material: Ferrite
• Shielding configuration: Unshielded
• Mounting type: Through hole
• Package configuration: Radial orientation
• RoHS3 compliance status

Secondary Compatibility Factors:

• Current rating equal to or exceeding 1 A
• DC resistance within acceptable operational limits
• Operating temperature range encompassing the original -25°C to 105°C specification
• ECCN and HTSUS classifications matching regulatory requirements

The substitute part 1110-121K-RC from Bourns Inc. satisfies these substitution criteria through equivalent inductance specification, matching core material, identical shielding classification, and compatible through-hole radial mounting configuration.

Parameter Comparison

Engineering Selection Recommendations

The 1110-121K-RC from Bourns Inc. functions as a direct substitute for the obsolete LHL10TB121KB based on the following engineering criteria:

Electrical Compatibility: Both components maintain identical 120 µH inductance values with ±10% tolerance specifications. The substitute part provides a current rating of 2 A, which exceeds the original 1 A requirement, ensuring adequate headroom for circuit operation. The substitute's DC resistance of 127mOhm maximum is lower than the original 250mOhm maximum, resulting in reduced power dissipation and improved efficiency characteristics.

Thermal and Environmental Compliance: The substitute part operates across -55°C to 105°C, which encompasses the original operating range of -25°C to 105°C. Both components maintain ROHS3 compliance and identical regulatory classifications (EAR99, HTSUS 8504.50.8000), ensuring regulatory continuity.

Physical and Mechanical Compatibility: Both inductors feature through-hole radial mounting configurations suitable for PCB integration. The substitute part dimensions (0.660" diameter, 0.840" height) differ from the original (0.433" diameter, 0.551" height), requiring PCB layout verification to confirm footprint accommodation.

Product Status: The substitute part maintains active product status with current manufacturing availability, addressing the supply chain constraints associated with the obsolete LHL10TB121KB.

Frequently Asked Questions (FAQ)

Q: Can the 1110-121K-RC directly replace the LHL10TB121KB without circuit modification?

A: The 1110-121K-RC provides electrical equivalence through matching inductance and tolerance specifications. However, physical dimensions differ significantly. PCB layout verification is required to confirm that the larger radial package (0.660" diameter versus 0.433" diameter) accommodates existing board space and component placement constraints.

Q: What is the significance of the lower DC resistance in the substitute part?

A: The 1110-121K-RC exhibits 127mOhm maximum DC resistance compared to the original 250mOhm maximum. This lower resistance reduces I²R power dissipation within the inductor, resulting in lower operating temperatures and improved circuit efficiency. This characteristic represents an enhancement over the original specification.

Q: Are there temperature range differences between these components?

A: The substitute part operates from -55°C to 105°C, extending the lower temperature limit by 30°C compared to the original -25°C to 105°C range. This expanded operating window provides additional thermal margin for applications requiring extended low-temperature performance.

Q: Does the higher current rating of the substitute part affect circuit operation?

A: The 1110-121K-RC is rated for 2 A maximum current, double the original 1 A specification. This increased rating does not negatively affect circuits designed for 1 A operation. The component operates safely at or below its rated current, and the higher rating provides additional design margin.

Q: What packaging differences exist between these inductors?

A: Both components utilize through-hole radial mounting. The LHL10TB121KB features a vertical cylinder package, while the 1110-121K-RC uses a drum core wirewound configuration. Both are classified as radial packages suitable for through-hole PCB assembly, though physical dimensions require verification for specific board layouts.

Q: Are both components RoHS compliant?

A: Yes, both the LHL10TB121KB and 1110-121K-RC maintain ROHS3 compliance status, ensuring compatibility with RoHS-regulated applications and supply chains.