SPD74-684M Equivalent & Substitute Parts

Part Overview

The SPD74-684M is a 680 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications with a current rating of 320 mA and maximum DC resistance of 4.63Ohm. This component operates across the temperature range of -55°C to 125°C and is classified as obsolete product status.

Finding equivalent and substitute parts is necessary due to the obsolete status of the SPD74-684M. Identifying compatible alternatives ensures design continuity and supply chain reliability for applications requiring 680 µH inductance in compact surface mount packages.

Substiute Parts

SPD74-684M

API Delevan Inc.In Stock: 1171SPD74-684M Datasheet

Current PartRFQ

HRSPD74-684M

API Delevan Inc.In Stock: 1094HRSPD74-684M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD74-684M is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 680 µH with ±20% tolerance
• Core material: Ferrite with shielding
• Mounting type: Surface Mount
• Physical package classification: Nonstandard
• Operating temperature range compatibility

Secondary Compatibility Factors:

• Current rating must meet or exceed application requirements
• DC resistance must be acceptable for circuit performance
• Surface mount package dimensions must fit PCB layout constraints

The HRSPD74-684M qualifies as a substitute part because it maintains the same inductance value (680 µH), tolerance (±20%), core material (ferrite), shielding configuration, and surface mount mounting type. Both components share the nonstandard package classification and operate within overlapping temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using SPD74-684M:

The HRSPD74-684M is available as an active product substitute. Key selection considerations based on provided specifications:

Current Rating Differential: The HRSPD74-684M has a lower current rating (210 mA) compared to the SPD74-684M (320 mA). Selection of this substitute is appropriate only when circuit current requirements do not exceed 210 mA.

DC Resistance Advantage: The HRSPD74-684M exhibits lower DC resistance (3.2Ohm Max) compared to the main part (4.63Ohm Max), resulting in reduced power dissipation and improved efficiency in applications operating within the 210 mA current limit.

Temperature Range: The HRSPD74-684M supports an extended upper operating temperature limit (130°C versus 125°C), providing additional thermal margin in high-temperature environments.

Product Status: The HRSPD74-684M maintains active product status with established supply chain availability, whereas the SPD74-684M is obsolete. Current inventory of 1046 pieces is available for the substitute part.

Compliance Considerations: Both parts maintain identical RoHS non-compliant status. No compliance advantage exists between the two options.

Physical Dimensions: The HRSPD74-684M dimensions (7.37mm x 7.37mm x 5.03mm) are marginally larger than the SPD74-684M (7.30mm x 7.30mm x 4.70mm). PCB layout verification is required to confirm fit within existing design constraints.

Frequently Asked Questions (FAQ)

Q: Can HRSPD74-684M directly replace SPD74-684M in all applications?

A: Direct replacement is possible only when circuit current requirements do not exceed 210 mA. The HRSPD74-684M current rating is lower than the main part. Verify actual circuit current draw before substitution.

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

A: Both parts share identical ±20% inductance tolerance. This tolerance applies to the 680 µH nominal value, meaning actual inductance may range from 544 µH to 816 µH. Circuit designs must account for this tolerance range.

Q: Are there physical fit concerns when substituting HRSPD74-684M for SPD74-684M?

A: The HRSPD74-684M is slightly larger in all dimensions. The height difference is 0.33mm (5.03mm versus 4.70mm). Confirm PCB clearance and component placement constraints before implementation.

Q: What is the difference between the test frequencies listed for these parts?

A: The SPD74-684M inductance is tested at 1 kHz, while the HRSPD74-684M is tested at 10 kHz. Both parts maintain the same 680 µH inductance value at their respective test frequencies. The inductance value specification applies across the operating frequency range.

Q: Why does HRSPD74-684M have lower DC resistance?

A: Lower DC resistance (3.2Ohm versus 4.63Ohm) is a characteristic of the HRSPD74-684M design. This results in reduced resistive losses and lower power dissipation during operation, provided current remains within the 210 mA rating.

Q: What does "Tape & Reel (TR)" packaging mean for HRSPD74-684M?

A: Tape & Reel packaging indicates the component is supplied on continuous carrier tape wound on a reel, suitable for automated assembly equipment. This differs from the nonstandard packaging format of the main part and facilitates high-volume production processes.

Q: Are both parts RoHS compliant?

A: No. Both SPD74-684M and HRSPD74-684M are RoHS non-compliant. If RoHS compliance is required for your application, alternative components must be evaluated.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: The HRSPD74-684M has MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. MSL information is not provided for the SPD74-684M in the available specifications.