VLS5045EX-8R2M Equivalent & Substitute Parts

Part Overview

The VLS5045EX-8R2M is an 8.2 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 2.8 A continuous current with 55mOhm DC resistance. This component is classified as Not For New Designs, indicating it has been superseded in TDK's product portfolio. Finding equivalent substitute parts is necessary for applications requiring continued supply, legacy system maintenance, or when design flexibility permits component selection from active product lines.

Substiute Parts

VLS5045EX-8R2M

TDK CorporationIn Stock: 1952VLS5045EX-8R2M Datasheet

Current PartRFQ

SRR4828A-8R2Y

Bourns Inc.In Stock: 1495SRR4828A-8R2Y Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the VLS5045EX-8R2M is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 8.2 µH (exact match required)
• Core type: Ferrite drum core, wirewound construction
• Shielding: Shielded configuration
• Mounting: Surface mount technology
• Test frequency: 100 kHz

Secondary Compatibility Parameters:

• Current rating: Minimum 2.4 A (substitute must support application current demands)
• DC resistance: Maximum 87mOhm (acceptable variance from 55mOhm baseline)
• Operating temperature: Minimum -40°C ~ 105°C overlap required
• Package classification: Nonstandard (physical footprint compatibility required)
• RoHS and MSL compliance: ROHS3 and MSL 1 maintained

The SRR4828A-8R2Y from Bourns Inc. meets all primary matching criteria and maintains compatibility within acceptable secondary parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The SRR4828A-8R2Y is a valid substitute for the VLS5045EX-8R2M based on matching inductance value, core construction, shielding configuration, and surface mount package type. Both components maintain ROHS3 compliance and MSL 1 rating.

Key Considerations:

1. Product Status: The VLS5045EX-8R2M is classified Not For New Designs. The SRR4828A-8R2Y is Active, ensuring continued manufacturer support and long-term availability.

2. Current Rating Differential: The Bourns substitute is rated 2.4 A versus the TDK original at 2.8 A. Applications operating at or above 2.4 A require verification that the lower rating does not compromise circuit performance or thermal margins.

3. DC Resistance Impact: The SRR4828A-8R2Y exhibits 87mOhm maximum DCR compared to 55mOhm for the original. This 32mOhm increase results in higher resistive losses and heat generation. Power dissipation calculations should be performed for high-current or continuous-duty applications.

4. Thermal Performance: The Bourns component supports -40°C ~ 150°C operation, exceeding the TDK range of -40°C ~ 105°C. This provides superior thermal headroom for elevated ambient or self-heating scenarios.

5. Physical Dimensions: The SRR4828A-8R2Y is 0.2mm smaller in footprint (4.80mm vs 5.00mm) and 1.5mm lower in height (3.00mm vs 4.50mm). PCB layout modifications may be required; verify mechanical clearance and trace routing compatibility.

6. Certifications: The Bourns part carries AEC-Q200 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can the SRR4828A-8R2Y directly replace the VLS5045EX-8R2M without circuit modification?

A: Direct substitution is possible if the application current does not exceed 2.4 A and the increased DC resistance (87mOhm vs 55mOhm) does not violate thermal or efficiency requirements. Verify circuit performance through simulation or testing before production implementation.

Q: What is the impact of the 32mOhm DCR increase on circuit performance?

A: Higher DC resistance increases resistive losses proportionally to the square of current (P = I²R). At 2.4 A, the Bourns part dissipates approximately 0.50 W compared to 0.32 W for the TDK original. Thermal analysis and heatsinking requirements should be reassessed.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: The SRR4828A-8R2Y has a smaller footprint (4.80mm vs 5.00mm) and lower profile (3.00mm vs 4.50mm). While the reduced size may improve clearance, verify that the component can be placed within the original pad pattern or that PCB redesign is acceptable.

Q: Does the ±30% inductance tolerance of the Bourns part affect circuit operation?

A: The wider tolerance (±30% vs ±20%) may impact frequency-dependent circuits, filters, or impedance-matching networks. Applications with tight inductance specifications should include tolerance analysis or select components with tighter binning if available.

Q: What is the significance of the 1.25 A saturation current specification on the Bourns part?

A: Saturation current indicates the point at which core flux density reaches saturation, causing inductance to degrade. The 1.25 A Isat on the SRR4828A-8R2Y is below the 2.4 A current rating, suggesting operation near saturation at maximum rated current. Verify that circuit current transients do not exceed this threshold.

Q: Is the AEC-Q200 certification on the Bourns part required for this application?

A: AEC-Q200 certification is mandatory for automotive applications and recommended for high-reliability industrial or medical applications. Non-automotive applications may not require this certification, but it provides additional quality assurance.

Q: What is the difference in self-resonant frequency between the two parts?

A: The SRR4828A-8R2Y specifies 35 MHz SRF. The VLS5045EX-8R2M does not provide this specification. SRF determines the frequency above which the inductor behaves capacitively. Verify that circuit operating frequencies remain well below 35 MHz to maintain inductive behavior.

Q: Can both parts be used interchangeably in high-frequency applications?

A: High-frequency performance depends on SRF, Q factor, and parasitic capacitance. The Bourns part provides SRF specification (35 MHz), while the TDK part does not. For applications above 10 MHz, the Bourns part offers better-defined frequency response characteristics.