1210HS-103EKFS Equivalent & Substitute Parts Reference

Part Overview

The 1210HS-103EKFS is a 10 µH unshielded drum core wirewound inductor manufactured by Delta Electronics/Components, rated for 190 mA continuous current with 1.8 Ohm DC resistance in a 1210 (3225 Metric) surface mount package. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

1210HS-103EKFS

Delta Electronics/ComponentsIn Stock: 7761210HS-103EKFS Datasheet

Current PartRFQ

7440329100

Würth ElektronikIn Stock: 33597440329100 Datasheet

DirectRFQ

74476410

Würth ElektronikIn Stock: 250574476410 Datasheet

DirectRFQ

NLCV32T-100K-EFD

TDK CorporationIn Stock: 1434NLCV32T-100K-EFD Datasheet

DirectRFQ

NLCV32T-100K-EFR

TDK CorporationIn Stock: 10405NLCV32T-100K-EFR Datasheet

DirectRFQ

NLCV32T-100K-EFRD

TDK CorporationIn Stock: 5056NLCV32T-100K-EFRD Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1210HS-103EKFS is determined by strict equivalence in the following parameters:

Critical Matching Parameters:

• Inductance value: 10 µH (±10% tolerance)
• Package / Case: 1210 (3225 Metric) surface mount
• Core type: Ferrite drum core, unshielded
• Mounting type: Surface mount

Allowable Variation Parameters:

• Current rating: Substitute parts must equal or exceed 190 mA
• DC resistance: Substitute parts must equal or be lower than 1.8 Ohm (lower DCR is acceptable)
• Operating temperature: Substitute parts must support minimum -40°C ~ 85°C range
• Compliance: RoHS3 and MSL 1 maintained across all substitutes

All identified substitute parts meet these criteria while offering improved electrical performance characteristics (higher current ratings and/or lower DC resistance) or extended temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

NLCV32T-100K-EFRD (TDK Corporation) and NLCV32T-100K-EFR (TDK Corporation) are the preferred substitutes. Both parts deliver 600 mA current rating with 504 mOhm maximum DC resistance, providing significant performance margin above the original 190 mA specification. NLCV32T-100K-EFRD includes AEC-Q200 automotive qualification and supports extended temperature operation to 125°C. Both maintain identical 10 µH inductance, ±10% tolerance, and 1210 (3225 Metric) package compatibility.

Secondary Substitutes (Conditional Use):

7440329100 (Würth Elektronik WE-LQ Series) offers 450 mA current rating with superior 390 mOhm DCR and extended temperature range to 125°C. Dimensional footprint is slightly reduced (3.20mm x 2.50mm vs. 3.50mm x 2.80mm original), with seated height of 1.70mm versus 2.40mm original. This part is suitable for applications where lower profile height is beneficial.

NLCV32T-100K-EFD (TDK Corporation NLCV-EFD Series) provides 450 mA current rating with 468 mOhm DCR and includes AEC-Q200 qualification. Operating temperature extends to 105°C. This variant is available in Cut Tape & Digi-Reel packaging.

Marginal Substitute (Limited Application):

74476410 (Würth Elektronik WE-GF Series) delivers 150 mA current rating with 2.1 Ohm maximum DCR. This part does not exceed the original 190 mA specification and exhibits higher DC resistance. Use is restricted to applications where current demand does not exceed 150 mA and where the higher DCR is acceptable.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and ferrite drum core unshielded construction. Selection should prioritize application-specific requirements for current capacity, operating temperature range, and any automotive qualification mandates.

Frequently Asked Questions (FAQ)

Q: Can NLCV32T-100K-EFRD directly replace 1210HS-103EKFS in existing designs?

A: Yes. Both parts share identical 10 µH inductance, ±10% tolerance, 1210 (3225 Metric) package, and surface mount configuration. NLCV32T-100K-EFRD exceeds the original 190 mA current rating at 600 mA and provides lower DC resistance (504 mOhm vs. 1.8 Ohm). Dimensional differences are minor: substitute is 3.20mm x 2.50mm versus original 3.50mm x 2.80mm. Seated height is 1.70mm lower (1.70mm vs. 2.40mm). PCB layout verification is required to confirm clearance compatibility.

Q: What is the significance of AEC-Q200 qualification on NLCV32T-100K-EFRD and NLCV32T-100K-EFD?

A: AEC-Q200 is an automotive electronics qualification standard. Parts bearing this rating have undergone stress testing and reliability validation for automotive applications. The original 1210HS-103EKFS does not carry AEC-Q200 qualification. If the application requires automotive-grade components, NLCV32T-100K-EFRD or NLCV32T-100K-EFD are appropriate selections.

Q: Why does 74476410 show lower current rating (150 mA) than the original part (190 mA)?

A: 74476410 is a Würth WE-GF series inductor with design specifications that limit continuous current to 150 mA. This part does not meet the minimum current requirement of the original specification. Use of this substitute is restricted to circuit designs where actual operating current does not exceed 150 mA.

Q: What is the impact of different DC resistance values among substitutes?

A: DC resistance directly affects power dissipation and voltage drop across the inductor. Lower DCR reduces heat generation and improves efficiency. The original part exhibits 1.8 Ohm DCR. Substitutes 7440329100, NLCV32T-100K-EFD, NLCV32T-100K-EFR, and NLCV32T-100K-EFRD all feature significantly lower DCR (390–504 mOhm), resulting in reduced power loss. 74476410 at 2.1 Ohm DCR is marginally higher than the original. For applications sensitive to inductor losses, lower DCR substitutes are preferred.

Q: Are there packaging differences between substitutes?

A: Yes. The original 1210HS-103EKFS is supplied in standard packaging. Würth 7440329100 is packaged in Tape & Reel (TR). TDK NLCV32T-100K-EFD is available in Cut Tape (CT) & Digi-Reel. TDK NLCV32T-100K-EFR and NLCV32T-100K-EFRD are supplied in Tape & Reel (TR). Packaging selection affects procurement, handling, and assembly processes. Confirm packaging compatibility with manufacturing requirements.

Q: What is the operating temperature range consideration for substitute selection?

A: The original 1210HS-103EKFS operates from -40°C to 85°C. All substitutes support this range. Extended-range substitutes (7440329100 and NLCV32T-100K-EFRD) operate to 125°C, while others extend to 105°C. For applications operating above 85°C, extended-range substitutes provide additional thermal margin. For standard -40°C to 85°C operation, all substitutes are suitable.

Q: How do self-resonant frequency differences affect circuit performance?

A: Self-resonant frequency (SRF) indicates the frequency at which the inductor transitions from inductive to capacitive behavior. The original part exhibits 36 MHz SRF. Substitutes range from 26–30 MHz. For circuits operating well below these frequencies (typical for power supply and filtering applications), SRF differences have minimal impact. For high-frequency applications approaching or exceeding 20 MHz, SRF variation should be evaluated against circuit requirements.

Q: Is PCB layout modification required when substituting 1210HS-103EKFS?

A: Minor layout review is recommended. Substitute parts maintain the 1210 (3225 Metric) package designation but exhibit slightly different physical dimensions. The original part measures 3.50mm x 2.80mm with 2.40mm seated height. Most substitutes measure 3.20mm x 2.50mm with 2.40mm seated height (except 7440329100 at 1.70mm height). Verify that PCB pad spacing, component clearances, and thermal management provisions remain adequate for the selected substitute.