SPD74-104M Equivalent & Substitute Parts

Part Overview

The SPD74-104M is a 100 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 860 mA continuous current with a maximum DC resistance of 610 mOhm. This component operates across the temperature range of -55°C to 125°C and is designed for surface mount applications in nonstandard packaging.

The SPD74-104M is classified as obsolete. Identifying equivalent and substitute parts is necessary to support ongoing maintenance, repair, and redesign activities for legacy systems and applications currently utilizing this inductor.

Substiute Parts

SPD74-104M

API Delevan Inc.In Stock: 1036SPD74-104M Datasheet

Current PartRFQ

HRSPD74-104M

API Delevan Inc.In Stock: 889HRSPD74-104M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPD74-104M is evaluated based on the following critical parameters that must align for functional equivalence:

Primary Matching Criteria:

• Inductance value: 100 µH (fixed requirement)
• Inductance tolerance: ±20% (fixed requirement)
• Core material: Ferrite (fixed requirement)
• Shielding: Shielded (fixed requirement)
• Mounting type: Surface Mount (fixed requirement)

Secondary Compatibility Criteria:

• Current rating: Must equal or exceed 860 mA
• DC resistance: Must not exceed 610 mOhm
• Operating temperature range: Must encompass or exceed -55°C to 125°C
• Physical dimensions: Must be compatible with board layout constraints
• Package type: Nonstandard (fixed requirement)

The HRSPD74-104M is identified as a substitute part. However, this part exhibits reduced current handling capability (540 mA versus 860 mA) and lower DC resistance (450 mOhm maximum versus 610 mOhm maximum). The HRSPD74-104M is suitable only in applications where the reduced current rating does not compromise circuit performance.

Parameter Comparison

Engineering Selection Recommendations

SPD74-104M (Main Part): The SPD74-104M is obsolete and no longer in active production. Inventory availability is limited to existing stock (979 pieces reported). This part is RoHS non-compliant and carries REACH Unaffected status. Selection of this part is appropriate only when existing inventory must be consumed or when legacy system compatibility is mandatory.

HRSPD74-104M (Substitute Part): The HRSPD74-104M is in active production status with current inventory availability (792 pieces reported). This part is also RoHS non-compliant but offers extended operating temperature range (-55°C to 130°C versus -55°C to 125°C). The substitute is packaged in Tape & Reel format, which supports automated assembly processes.

Critical Limitation: The HRSPD74-104M is rated for 540 mA continuous current, compared to the SPD74-104M's 860 mA rating. This 37% reduction in current capacity represents a significant functional difference. Substitution is permissible only in applications where circuit current demands do not exceed 540 mA at any operating condition.

Physical Compatibility: The HRSPD74-104M exhibits slightly larger footprint dimensions (7.37 × 7.37 mm versus 7.30 × 7.30 mm) and greater seated height (5.03 mm versus 4.70 mm). PCB layout verification is required to confirm clearance compatibility.

Frequently Asked Questions (FAQ)

Q: Can the HRSPD74-104M directly replace the SPD74-104M in all applications?

A: No. The HRSPD74-104M has a reduced current rating of 540 mA compared to the SPD74-104M's 860 mA rating. Direct substitution is permissible only in circuits where the maximum operating current does not exceed 540 mA. Circuit analysis is required to confirm current compatibility.

Q: What is the significance of the DC resistance difference between these parts?

A: The SPD74-104M has a maximum DC resistance of 610 mOhm, while the HRSPD74-104M has a maximum of 450 mOhm. The substitute exhibits lower resistance, which results in reduced power dissipation and heat generation. This is a favorable characteristic and does not prevent substitution from a resistance perspective.

Q: Are there physical installation constraints when using the HRSPD74-104M as a substitute?

A: Yes. The HRSPD74-104M is 0.33 mm taller (5.03 mm seated height versus 4.70 mm) and has a slightly larger footprint (7.37 × 7.37 mm versus 7.30 × 7.30 mm). PCB layout clearance must be verified, particularly in applications with height-constrained assemblies or dense component placement.

Q: What is the difference in inductance test frequency between these parts?

A: The SPD74-104M inductance is tested at 1 kHz, while the HRSPD74-104M is tested at 10 kHz. Both parts maintain the same 100 µH inductance value with ±20% tolerance at their respective test frequencies. This difference reflects standard measurement methodology and does not affect functional equivalence.

Q: Why is the SPD74-104M classified as obsolete?

A: The SPD74-104M is no longer in active production by API Delevan Inc. The HRSPD74-104M represents the active production equivalent within the SPD74 series. For new designs or long-term supply assurance, the HRSPD74-104M is the recommended selection, subject to current rating compatibility verification.

Q: Are both parts RoHS compliant?

A: No. Both the SPD74-104M and HRSPD74-104M are RoHS non-compliant. If RoHS compliance is a requirement, alternative inductors from other manufacturers must be evaluated.

Q: What packaging formats are available for these parts?

A: The SPD74-104M is supplied in standard packaging (format not specified in available data). The HRSPD74-104M is supplied in Tape & Reel (TR) format, which is suitable for automated pick-and-place assembly processes.