1210HS-391EMFS Equivalent & Substitute Parts Reference

Part Overview

The 1210HS-391EMFS is a 390 nH unshielded drum core wirewound inductor manufactured by Delta Electronics/Components, designed for surface mount applications in the 1210 (3225 Metric) package. This component operates at 530 mA with a DC resistance of 250 mOhm and is rated for -40°C to 85°C operating temperature range.

The 1210HS-391EMFS is classified as obsolete. Equivalent substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements. The substitute parts listed maintain the same inductance value and core geometry while offering active product status and extended temperature operating ranges.

Substiute Parts

1210HS-391EMFS

Delta Electronics/ComponentsIn Stock: 10631210HS-391EMFS Datasheet

Current PartRFQ

NLV32T-R39J-EF

TDK CorporationIn Stock: 5679NLV32T-R39J-EF Datasheet

SimilarRFQ

NLV32T-R39J-EFD

TDK CorporationIn Stock: 3232NLV32T-R39J-EFD Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1210HS-391EMFS is determined by the following critical parameters:

Mandatory Matching Parameters:

• Inductance value: 390 nH
• Package / Case: 1210 (3225 Metric)
• Core type: Ferrite drum core, unshielded
• Mounting type: Surface mount

Allowable Parameter Variations:

• Current rating may be lower than the original part (substitute parts rated at 450 mA versus original 530 mA)
• DC resistance may be higher than the original part (substitute parts rated at 450 mOhm Max versus original 250 mOhm)
• Inductance tolerance may be tighter (±5% versus ±20%)
• Operating temperature range may be extended (up to 105°C versus 85°C)
• Q factor and self resonant frequency may differ within acceptable ranges for the same inductance class

The substitute parts NLV32T-R39J-EF and NLV32T-R39J-EFD, both manufactured by TDK Corporation, meet all mandatory matching parameters and are classified as active products with current availability.

Parameter Comparison

Engineering Selection Recommendations

For Standard Applications: The NLV32T-R39J-EF is suitable for applications where the reduced current rating of 450 mA is acceptable within the circuit design. This part is active and available in Tape & Reel packaging for automated assembly processes. The tighter inductance tolerance of ±5% provides improved consistency compared to the original ±20% specification.

For Automotive and High-Reliability Applications: The NLV32T-R39J-EFD is recommended for designs requiring automotive-grade qualification. This part carries AEC-Q200 certification and is active with current inventory. The extended operating temperature range of -40°C to 105°C provides additional thermal margin compared to the original part's -40°C to 85°C range.

Design Considerations: Both substitute parts operate at lower current ratings (450 mA) than the original 1210HS-391EMFS (530 mA). Circuit designs must verify that the 450 mA rating is sufficient for the intended application. The increased DC resistance of 450 mOhm Max in substitute parts versus 250 mOhm in the original part will result in higher power dissipation and should be evaluated in thermal analysis.

Both substitute parts are ROHS3 compliant and have unlimited moisture sensitivity level (MSL 1), matching the environmental compliance profile of the original component.

Frequently Asked Questions (FAQ)

Q: Can the NLV32T-R39J-EF and NLV32T-R39J-EFD be used interchangeably?

A: Yes, both parts are electrically and mechanically equivalent. The primary difference is that NLV32T-R39J-EFD carries AEC-Q200 automotive qualification, while NLV32T-R39J-EF does not. Selection depends on application requirements for automotive compliance.

Q: What is the impact of the reduced current rating from 530 mA to 450 mA?

A: The substitute parts are rated for 450 mA maximum current. Applications operating the original part at currents above 450 mA must be redesigned or the substitute parts cannot be used. Circuits operating below 450 mA are unaffected.

Q: How does the increased DC resistance affect circuit performance?

A: The substitute parts have a maximum DC resistance of 450 mOhm compared to 250 mOhm in the original part. This results in approximately 80% higher resistive losses. Power dissipation will increase proportionally with current squared. Thermal analysis should be performed to ensure the component and surrounding circuitry remain within acceptable temperature limits.

Q: Are the physical dimensions compatible?

A: The substitute parts have slightly different physical dimensions. The original 1210HS-391EMFS measures 0.138" L x 0.110" W (3.50mm x 2.80mm), while the substitute parts measure 0.126" L x 0.098" W (3.20mm x 2.50mm). Both have the same maximum seated height of 0.094" (2.40mm). PCB footprints designed for the original part may require adjustment for the substitute parts.

Q: What is the difference between the inductance tolerances?

A: The original part has ±20% tolerance, while substitute parts have ±5% tolerance. The tighter tolerance of substitute parts provides better consistency and predictability in circuit performance. Designs that relied on the wider tolerance range of the original part will benefit from improved component matching.

Q: Are both substitute parts available in the same packaging format?

A: Both NLV32T-R39J-EF and NLV32T-R39J-EFD are supplied in Tape & Reel (TR) packaging, suitable for automated assembly. The original 1210HS-391EMFS was supplied in bulk packaging. Tape & Reel format is standard for high-volume production environments.

Q: What compliance certifications apply to each substitute part?

A: Both substitute parts are ROHS3 compliant and REACH unaffected. NLV32T-R39J-EFD additionally carries AEC-Q200 automotive qualification. Both parts have MSL 1 (unlimited moisture sensitivity level).