VLP8040T-330M Equivalent & Substitute Parts

Part Overview

The VLP8040T-330M is a 33 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 1.8 A with a maximum DC resistance of 110 mOhm. This component is classified as obsolete, making identification of suitable equivalent parts essential for ongoing design support and production continuity. The VLP series has been superseded by newer product lines while maintaining the same core electrical specifications. Substitute parts must preserve the 33 µH inductance value, ±20% tolerance, and surface mount configuration to ensure functional compatibility in existing circuit designs.

Key Parameters

Parameter	VLP8040T-330M
Inductance	33 µH
Inductance Tolerance	±20%
Current Rating (Amps)	1.8 A
DC Resistance (DCR)	110 mOhm Max
Shielding	Shielded
Core Material	Ferrite
Operating Temperature Range	-40°C ~ 105°C
Mounting Type	Surface Mount
Inductance Test Frequency	100 kHz

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:

Primary Criteria (Must Match):

Inductance value: 33 µH
Inductance tolerance: ±20%
Mounting type: Surface Mount
Inductance test frequency: 100 kHz

Secondary Criteria (Allowable Variation):

Current rating: Substitute must equal or exceed 1.8 A
DC resistance: Lower values are acceptable; higher values require circuit validation
Shielding: Shielded substitutes are preferred; semi-shielded or unshielded options require EMI assessment
Operating temperature range: Must encompass or exceed -40°C ~ 105°C
Core material: Ferrite core maintained across all substitutes

Substitute Categories:

Category A - Direct Shielded Equivalents (Preferred): VLS6045EX-330M (TDK), CDRR105NP-330MC (Sumida), DRA124-330-R (Eaton)

Category B - Semi-Shielded Alternative: SRN8040-330M (Bourns)

Category C - Unshielded Options (EMI Assessment Required): IDC5020ER330M (Vishay Dale), UP2B-330-R (Eaton)

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating (A)	DCR (mOhm)	Shielding	Operating Temp (°C)	Product Status	Size L x W (mm)	Height (mm)
VLP8040T-330M	TDK	33 µH	±20%	1.8	110 Max	Shielded	-40 ~ 105	Obsolete	8.70 x 8.60	4.00
VLS6045EX-330M	TDK	33 µH	±20%	1.5	175	Shielded	-40 ~ 105	Active	6.00 x 6.00	4.50
SRN8040-330M	Bourns	33 µH	±20%	1.7	145 Max	Semi-Shielded	-40 ~ 125	Active	8.00 x 8.00	4.00
CDRR105NP-330MC	Sumida	33 µH	±20%	1.93	105 Max	Shielded	-40 ~ 125	Active	10.40 x 10.40	4.80
DRA124-330-R	Eaton	33 µH	±20%	1.98	108	Shielded	-40 ~ 165	Active	12.50 x 12.50	4.50
IDC5020ER330M	Vishay Dale	33 µH	±20%	2.1	100 Max	Unshielded	-40 ~ 125	Active	12.95 x 9.40	5.21
UP2B-330-R	Eaton	33 µH	±20%	2.1	91.7 Max	Unshielded	-40 ~ 85	Active	13.97 x 10.41	6.00

Engineering Selection Recommendations

For Direct Replacement (Shielded, Preferred):

CDRR105NP-330MC (Sumida America Components Inc.) provides the closest electrical match to the VLP8040T-330M. It maintains shielded construction, delivers 1.93 A current rating exceeding the original 1.8 A specification, and achieves 105 mOhm DCR comparable to the original 110 mOhm maximum. Operating temperature range extends to 125°C, providing thermal margin. RoHS3 compliance and active product status ensure long-term availability. Footprint increase (10.40 x 10.40 mm vs. 8.70 x 8.60 mm) requires PCB layout verification.

DRA124-330-R (Eaton - Electronics Division) offers superior current handling at 1.98 A with 108 mOhm DCR and extended operating temperature to 165°C. AEC-Q200 automotive qualification provides additional reliability assurance. Larger footprint (12.50 x 12.50 mm) and height (4.50 mm) necessitate board redesign assessment.

For Space-Constrained Applications (Shielded):

VLS6045EX-330M (TDK) maintains TDK manufacturing continuity with the smallest footprint (6.00 x 6.00 mm). Current rating of 1.5 A falls below the original 1.8 A specification; this substitute is suitable only for applications where actual operating current remains below 1.5 A. DCR of 175 mOhm represents a 59% increase over the original specification and may impact circuit performance in current-sensitive applications.

For Semi-Shielded Applications:

SRN8040-330M (Bourns Inc.) provides footprint compatibility (8.00 x 8.00 mm) with the original VLP8040T-330M. Semi-shielded construction reduces EMI performance compared to fully shielded designs. Current rating of 1.7 A approaches but does not meet the original 1.8 A specification. Extended operating temperature to 125°C and active product status support production continuity.

For Unshielded Applications (EMI Assessment Required):

IDC5020ER330M (Vishay Dale) and UP2B-330-R (Eaton) both deliver 2.1 A current rating with lower DCR values (100 mOhm and 91.7 mOhm respectively), providing electrical performance advantages. Unshielded construction eliminates EMI containment; these substitutes are applicable only in circuits where electromagnetic interference is not a design constraint or where external shielding is implemented. UP2B-330-R operating temperature limit of 85°C is below the original 105°C specification and restricts thermal margin.

Frequently Asked Questions (FAQ)

Q: Can VLS6045EX-330M replace VLP8040T-330M in all applications?

A: VLS6045EX-330M is suitable only for applications where actual operating current remains below 1.5 A. The original VLP8040T-330M is rated for 1.8 A; VLS6045EX-330M's lower current rating and higher DCR (175 mOhm vs. 110 mOhm) may degrade circuit performance in current-sensitive designs. Verify circuit current requirements before substitution.

Q: What is the difference between shielded and semi-shielded inductors?

A: Shielded inductors (VLS6045EX-330M, CDRR105NP-330MC, DRA124-330-R) provide complete electromagnetic field containment, minimizing EMI radiation and susceptibility. Semi-shielded inductors (SRN8040-330M) offer partial field containment with reduced size and cost. Unshielded inductors (IDC5020ER330M, UP2B-330-R) provide no field containment and are suitable only for non-EMI-sensitive applications.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry RoHS3 compliance certification, ensuring compatibility with environmental and regulatory requirements. The original VLP8040T-330M does not specify RoHS status due to its obsolete classification.

Q: What PCB layout considerations apply when substituting parts with different footprints?

A: Substitute parts with larger footprints (CDRR105NP-330MC at 10.40 x 10.40 mm, DRA124-330-R at 12.50 x 12.50 mm, IDC5020ER330M at 12.95 x 9.40 mm) require PCB layout modification. Verify pad spacing, trace routing, and thermal management compatibility. Smaller footprint substitutes (VLS6045EX-330M at 6.00 x 6.00 mm) may allow direct PCB reuse if pad patterns align.

Q: Which substitute offers the best thermal performance?

A: DRA124-330-R provides the highest operating temperature rating at -40°C ~ 165°C, followed by CDRR105NP-330MC and SRN8040-330M at -40°C ~ 125°C. The original VLP8040T-330M operates to 105°C. UP2B-330-R is limited to 85°C and is unsuitable for applications requiring the original thermal range.

Q: Can unshielded inductors be used as direct replacements?

A: Unshielded inductors (IDC5020ER330M, UP2B-330-R) are direct electrical replacements only in circuits where EMI is not a design constraint. If the original design relied on shielding for EMI compliance, unshielded substitutes will not maintain performance without external shielding implementation.

Q: What is the significance of DCR variation among substitutes?

A: DC resistance directly impacts inductor power dissipation and circuit efficiency. Lower DCR values reduce heat generation and improve efficiency. VLP8040T-330M specifies 110 mOhm maximum; CDRR105NP-330MC (105 mOhm) and DRA124-330-R (108 mOhm) maintain comparable performance, while VLS6045EX-330M (175 mOhm) represents a significant increase requiring thermal and efficiency reassessment.

Q: Are all substitutes available in the same packaging formats?

A: Substitute parts are available in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® formats. VLS6045EX-330M is supplied in Cut Tape & Digi-Reel®; all other substitutes are supplied in Tape & Reel format. Verify packaging compatibility with assembly equipment and procurement workflows.

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