VLF3012ST-100MR59 Equivalent & Substitute Parts

Part Overview

The VLF3012ST-100MR59 is a 10 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 590 mA continuous current with a maximum DC resistance of 330mOhm. 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, shielding characteristics, and operating temperature range while accommodating variations in current rating and DC resistance within acceptable design margins.

Substiute Parts

VLF3012ST-100MR59

TDK CorporationIn Stock: 869VLF3012ST-100MR59 Datasheet

Current PartRFQ

VLS3012HBX-100M

TDK CorporationIn Stock: 10194VLS3012HBX-100M Datasheet

MFR RecommendedRFQ

NR3012T100M

Taiyo YudenIn Stock: 2606NR3012T100M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the VLF3012ST-100MR59 are qualified based on the following critical parameters:

Primary Matching Criteria:

• Inductance value: 10 µH (exact match required)
• Tolerance: ±20% (matching specification)
• Shielding: Shielded (electromagnetic containment requirement)
• Mounting type: Surface Mount (PCB assembly compatibility)
• Package classification: Nonstandard (physical footprint compatibility)
• Operating temperature range: -40°C ~ 105°C (thermal envelope)

Secondary Compatibility Parameters:

• Current rating: Substitute must equal or exceed 590 mA
• DC resistance: Substitute must not exceed 330mOhm Max (power dissipation constraint)
• Physical dimensions: Height seated maximum 0.047" (1.20mm) for board clearance

Two substitute parts meet these criteria: VLS3012HBX-100M (TDK Corporation, Active status) and NR3012T100M (Taiyo Yuden, Not For New Designs status).

Parameter Comparison

Engineering Selection Recommendations

VLS3012HBX-100M (Primary Substitute): This part is the preferred substitute. It maintains Active product status, ensuring long-term availability and manufacturing support. The VLS3012HBX-100M exceeds the current rating requirement (1.48 A vs. 590 mA) and operates within the specified temperature range. The increased DC resistance (415mOhm vs. 330mOhm Max) represents a 25.8% increase; circuit thermal analysis is required to confirm acceptable power dissipation in the application. The core material differs (Metal vs. Ferrite), which may affect electromagnetic performance characteristics. Physical dimensions increase slightly (3.00mm x 3.00mm vs. 3.00mm x 2.80mm), requiring PCB layout verification for clearance compatibility. RoHS3 compliance is confirmed.

NR3012T100M (Secondary Substitute): This part is classified as Not For New Designs, limiting its suitability for new product development. The current rating (630 mA) exceeds the original specification with minimal margin. DC resistance (348mOhm Max) remains within acceptable tolerance of the original specification. The core material matches the original (Ferrite). Operating temperature range extends to 120°C, providing additional thermal margin. Physical dimensions match the VLS3012HBX-100M (3.00mm x 3.00mm). RoHS3 compliance is confirmed. This substitute is suitable for legacy system maintenance only.

Frequently Asked Questions (FAQ)

Q: Can VLS3012HBX-100M be used as a direct replacement for VLF3012ST-100MR59?

A: VLS3012HBX-100M meets the core electrical specifications (10 µH inductance, shielded, surface mount, nonstandard package). However, three factors require evaluation: (1) DC resistance increases from 330mOhm to 415mOhm, requiring thermal analysis to confirm acceptable power dissipation; (2) core material changes from Ferrite to Metal, potentially affecting frequency response and EMI characteristics; (3) physical dimensions increase from 3.00mm x 2.80mm to 3.00mm x 3.00mm, requiring PCB layout verification.

Q: Why does NR3012T100M have "Not For New Designs" status?

A: This designation indicates the manufacturer has discontinued active development and support for this part. While it remains available in inventory (2510 Pcs), it is suitable only for maintenance of existing systems. New product designs should use VLS3012HBX-100M.

Q: What is the significance of the DC resistance difference between these parts?

A: DC resistance directly affects power dissipation (P = I²R). At 590 mA, the original part dissipates 102.6 mW; VLS3012HBX-100M dissipates 144.6 mW at the same current. This 40% increase in dissipation must be evaluated against thermal design margins in the application circuit.

Q: Are there physical footprint compatibility concerns?

A: The original part measures 3.00mm x 2.80mm with 1.20mm height. Both substitutes measure 3.00mm x 3.00mm with 1.20mm height. The 0.20mm width increase requires verification that PCB layout and component spacing accommodate this dimension change.

Q: What compliance certifications apply to these substitutes?

A: Both VLS3012HBX-100M and NR3012T100M are RoHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Moisture sensitivity level is 1 (Unlimited) for all three parts.