SPD74-823M

Part Overview

The SPD74-823M is a 82 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 1 A maximum current with a DC resistance of 430 mOhm maximum. This component is classified as obsolete, necessitating the identification of suitable substitute parts for continued system support and new designs. The substitute part HRSPD74-823M provides electrical equivalence with modified current and resistance specifications suitable for alternative applications.

Substiute Parts

SPD74-823M

API Delevan Inc.In Stock: 1256SPD74-823M Datasheet

Current PartRFQ

HRSPD74-823M

API Delevan Inc.In Stock: 860HRSPD74-823M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The HRSPD74-823M qualifies as a substitute based on the following matched electrical and mechanical parameters:

Matched Parameters:

• Inductance: 82 µH (identical)
• Inductance Tolerance: ±20% (identical)
• Shielding: Shielded (identical)
• Material - Core: Ferrite (identical)
• Mounting Type: Surface Mount (identical)
• Package / Case: Nonstandard (identical)

Modified Parameters (within allowable variance):

• Current Rating: 600 mA (reduced from 1 A)
• DC Resistance (DCR): 400 mOhm Max (reduced from 430 mOhm Max)
• Operating Temperature Range: -55°C ~ 130°C (expanded from -55°C ~ 125°C)
• Physical Dimensions: 0.290" L x 0.290" W (7.37mm x 7.37mm), Height 0.198" (5.03mm) (minimal variation)
• Inductance Frequency - Test: 100 kHz (changed from 1 kHz)
• Product Status: Active (versus Obsolete)

Substitution is valid for circuits where the current requirement does not exceed 600 mA and where the slightly increased operating temperature ceiling does not conflict with thermal design margins.

Parameter Comparison

Engineering Selection Recommendations

The HRSPD74-823M is the recommended substitute for the obsolete SPD74-823M when circuit current requirements do not exceed 600 mA. The substitute part maintains identical inductance and shielding characteristics while offering improved product availability due to its active status. Both parts share equivalent RoHS non-compliance status and ferrite core construction.

The HRSPD74-823M provides an expanded operating temperature ceiling (-55°C ~ 130°C versus -55°C ~ 125°C), which accommodates more stringent thermal operating conditions. The reduced current rating and improved DC resistance profile result in lower power dissipation characteristics, benefiting thermal management in current-limited applications.

Dimensional compatibility is confirmed within standard manufacturing tolerances. The packaging format change (Tape & Reel for the substitute) aligns with modern manufacturing and assembly workflows.

Frequently Asked Questions (FAQ)

Q: Can the HRSPD74-823M directly replace the SPD74-823M in all applications?

A: Direct substitution is valid only in circuits designed for 600 mA or lower current operation. Applications requiring sustained 1 A operation require circuit redesign or retention of the original part. Inductance, tolerance, and shielding characteristics are equivalent across both parts.

Q: What is the significance of the different inductance test frequencies (1 kHz vs. 100 kHz)?

A: The inductance test frequency indicates the operating point at which inductance is measured. Both parts maintain 82 µH inductance at their respective test frequencies, indicating consistent magnetic performance across the operating bandwidth of typical applications.

Q: Are the dimensional differences between SPD74-823M and HRSPD74-823M significant for PCB layout?

A: The dimensional variations (0.003" in length and width, 0.013" in height) fall within standard land pattern tolerances and do not require PCB redesign. Verify clearance margins in height-constrained assemblies where the additional 0.013" height of the substitute may impact clearance requirements.

Q: What is the difference between current rating and saturation current?

A: The current rating specifies the maximum continuous current the part can conduct without exceeding temperature limits. Saturation current (Isat) indicates the current level at which inductor core saturation begins, reducing inductance. The SPD74-823M lists 1 A for both parameters, establishing the maximum operating envelope.

Q: Can the substitute part be used in new designs?

A: Yes. The HRSPD74-823M is classified as Active product status and is recommended for new designs requiring 82 µH ferrite core shielded inductors at current ratings of 600 mA or less.