SPD74R-183M Equivalent & Substitute Parts

Part Overview

The SPD74R-183M is a 18 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 2.3 A continuous current with a maximum DC resistance of 91 mOhm. This surface mount component operates across the temperature range of -55°C to 125°C and is classified as Active product status with ROHS3 compliance.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances. The SPD74R-183M serves applications requiring stable inductance values in compact surface mount packages, making alternative sources valuable for supply chain continuity and design flexibility.

Substiute Parts

SPD74R-183M

API Delevan Inc.In Stock: 841SPD74R-183M Datasheet

Current PartRFQ

SRR0745A-180M

Bourns Inc.In Stock: 6650SRR0745A-180M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD74R-183M is determined by strict alignment of the following critical parameters:

Inductance Value: The substitute part must maintain 18 µH inductance within the ±20% tolerance band, measured at 1 kHz test frequency.

Current Rating: The substitute must support the application's current requirements. The SPD74R-183M is rated for 2.3 A continuous current with saturation current (Isat) of 2.3 A. Substitute parts with equal or higher current ratings are acceptable.

DC Resistance: Maximum DCR of 91 mOhm establishes the upper limit for acceptable resistance. Substitute parts with DCR at or below this threshold maintain equivalent power dissipation characteristics.

Core Material and Shielding: Both the main part and substitute must use ferrite core material with shielding to ensure electromagnetic compatibility and performance consistency.

Package Dimensions: Physical dimensions of 7.30 mm × 7.30 mm (length × width) and maximum seated height of 4.70 mm must be maintained for PCB layout compatibility.

Operating Temperature Range: The substitute must support the full operating temperature range of -55°C to 125°C or a range that encompasses the application's thermal requirements.

Compliance Standards: RoHS3 compliance and MSL Level 1 classification are required for environmental and handling consistency.

Parameter Comparison

Engineering Selection Recommendations

SRR0745A-180M (Bourns Inc.) as Substitute:

The SRR0745A-180M qualifies as a functional substitute for the SPD74R-183M based on matching inductance value, tolerance, core material, shielding configuration, and physical package dimensions. Both components are Active status products with ROHS3 compliance and MSL Level 1 classification, ensuring equivalent environmental and regulatory standing.

The SRR0745A-180M exhibits lower DC resistance (90 mOhm versus 91 mOhm maximum), which represents an improvement in power dissipation characteristics. However, the current rating differential must be evaluated against application requirements. The SRR0745A-180M is rated for 1.8 A continuous current with 1.95 A saturation current, compared to the SPD74R-183M's 2.3 A and 2.3 A ratings respectively.

The SPD74R-183M supports a wider operating temperature range (-55°C to 125°C) compared to the SRR0745A-180M (-40°C to 125°C). Applications requiring operation below -40°C must retain the SPD74R-183M.

The SRR0745A-180M carries AEC-Q200 automotive qualification, providing additional reliability documentation for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-180M replace the SPD74R-183M in all applications?

A: Substitution is valid only when the application current requirement does not exceed 1.8 A continuous or 1.95 A saturation current. If the design requires the full 2.3 A rating of the SPD74R-183M, the substitute is not appropriate. Additionally, if operation below -40°C is required, the SPD74R-183M must be retained due to its extended lower temperature limit.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both the SPD74R-183M and SRR0745A-180M share identical package dimensions of 7.30 mm × 7.30 mm (length × width) with a maximum seated height of 4.70 mm. PCB footprints and mounting patterns are compatible.

Q: What is the significance of the ±20% inductance tolerance?

A: The ±20% tolerance means the actual inductance value may range from 14.4 µH to 21.6 µH. Both the main part and substitute operate within this same tolerance band at 1 kHz test frequency, ensuring equivalent inductance performance variability.

Q: Does the lower DC resistance of the SRR0745A-180M provide any advantage?

A: The SRR0745A-180M's 90 mOhm maximum DCR compared to the SPD74R-183M's 91 mOhm maximum represents marginally lower resistive losses. This difference is negligible in most applications but may provide slight thermal benefits in high-current or continuous-duty scenarios within the substitute's 1.8 A rating limit.

Q: What does AEC-Q200 qualification on the SRR0745A-180M indicate?

A: AEC-Q200 is an automotive industry reliability qualification standard. The SRR0745A-180M's AEC-Q200 rating indicates it has undergone automotive-grade testing and validation. This certification is beneficial for automotive applications but is not required for general industrial or consumer applications.

Q: Are both parts suitable for high-frequency applications?

A: Both components are tested and specified at 1 kHz. Self-resonant frequency data is not provided in the specifications. For applications requiring operation at frequencies significantly above 1 kHz, frequency response characteristics must be obtained directly from manufacturer datasheets.

Q: What is MSL Level 1 and why does it matter?

A: Moisture Sensitivity Level (MSL) 1 indicates unlimited shelf life without moisture control requirements. Both parts carry this classification, meaning they do not require special dry-pack storage or baking procedures prior to soldering, simplifying handling and inventory management.