VLF3012ST-150MR49 Equivalent & Substitute Parts

Part Overview

The VLF3012ST-150MR49 is a 15 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 490 mA maximum current with 490mOhm DC resistance. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing production and maintenance applications. Substitute parts must maintain the same inductance value, core shielding characteristics, and operating temperature range while accommodating variations in current rating and DC resistance within acceptable design margins.

Key Parameters

Parameter	VLF3012ST-150MR49
Inductance	15 µH
Current Rating	490 mA
DC Resistance (DCR)	490mOhm Max
Shielding	Shielded
Core Material	Ferrite
Tolerance	±20%
Operating Temperature	-40°C ~ 105°C
Mounting Type	Surface Mount
Package	Nonstandard (3.00mm x 2.80mm x 1.20mm)
Inductance Test Frequency	1 MHz

Substitute Part Grouping Explanation

Substitute parts for the VLF3012ST-150MR49 are qualified based on the following criteria:

Primary Matching Parameters:

Inductance value: 15 µH (exact match required)
Shielding: Shielded configuration
Mounting type: Surface Mount
Operating temperature range: -40°C ~ 105°C minimum
Inductance test frequency: 1 MHz

Allowable Variations:

Current rating: May exceed the original 490 mA specification
DC resistance: Variations acceptable within circuit design tolerances
Core material: Ferrite or metal core acceptable
Package dimensions: Nonstandard packages with equivalent footprint compatibility

The VLS3012ET-150M and VLS3012HBX-150M both satisfy these substitution criteria while offering improved current handling capabilities and active product status.

Parameter Comparison

Parameter	VLF3012ST-150MR49	VLS3012ET-150M	VLS3012HBX-150M
Manufacturer	TDK Corporation	TDK Corporation	TDK Corporation
Inductance	15 µH	15 µH	15 µH
Tolerance	±20%	±20%	±20%
Current Rating (Amps)	490 mA	550 mA	1.23 A
DC Resistance (DCR)	490mOhm Max	516mOhm Max	636mOhm Max
Shielding	Shielded	Shielded	Shielded
Core Material	Ferrite	Ferrite	Metal
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Size / Dimension	3.00mm x 2.80mm x 1.20mm	3.00mm x 3.00mm x 1.20mm	3.00mm x 3.00mm x 1.20mm
Product Status	Obsolete	Not For New Designs	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

VLS3012ET-150M: This substitute maintains ferrite core construction identical to the original VLF3012ST-150MR49 while providing 12% higher current rating (550 mA vs. 490 mA). The part carries ROHS3 compliance and is classified as "Not For New Designs," indicating limited long-term availability. DC resistance increases marginally to 516mOhm. Suitable for applications requiring ferrite core characteristics with moderate current headroom.

VLS3012HBX-150M: This substitute features metal core construction and the highest current rating (1.23 A) with saturation current of 1.37 A. The part maintains active product status, ensuring ongoing availability and supply chain stability. DC resistance is 636mOhm maximum. ROHS3 compliance is confirmed. Recommended for new designs and applications requiring maximum current capacity and long-term component availability.

Both substitutes maintain the required 15 µH inductance, shielded configuration, surface mount packaging, and -40°C to 105°C operating temperature range. Dimensional variations (3.00mm x 3.00mm vs. 3.00mm x 2.80mm) require PCB layout verification for footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can VLS3012ET-150M or VLS3012HBX-150M be used as direct replacements for VLF3012ST-150MR49?

A: Both parts satisfy the core electrical requirements: 15 µH inductance, shielded configuration, and identical operating temperature range. PCB layout must accommodate the slightly larger footprint (3.00mm x 3.00mm vs. 3.00mm x 2.80mm). Higher current ratings and DC resistance values are acceptable for most applications where the original part was specified.

Q: What is the difference between ferrite and metal core options?

A: VLS3012ET-150M uses ferrite core material matching the original VLF3012ST-150MR49. VLS3012HBX-150M uses metal core construction, offering higher current capacity (1.23 A vs. 550 mA) and active product status. Core material selection depends on circuit requirements and long-term availability needs.

Q: Why does VLS3012HBX-150M have higher DC resistance despite higher current rating?

A: DC resistance (636mOhm) reflects the metal core construction and wire gauge optimization for higher current handling. The saturation current specification (1.37 A) indicates the part maintains inductance stability at elevated currents. Circuit design must account for increased resistive losses.

Q: Are there packaging or moisture sensitivity concerns?

A: Both substitutes maintain MSL 1 (Unlimited) rating, identical to the original part. Packaging changes from bulk to Tape & Reel (TR) for VLS series parts. Standard SMD handling procedures apply.

Q: Which substitute is recommended for new designs?

A: VLS3012HBX-150M is classified as Active product status, ensuring long-term availability and supply chain continuity. This part is the preferred choice for new design implementations.

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