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SPD73-824M Equivalent & Substitute Parts
Part Overview
The SPD73-824M is an 820 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 188 mA with a maximum DC resistance of 6.54Ohm. This surface mount component operates across -55°C to 125°C and features ferrite core construction with ±20% inductance tolerance.
The SPD73-824M is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 820 µH |
| Inductance Tolerance | ±20% |
| Current Rating | 188 mA |
| DC Resistance (Max) | 6.54Ohm |
| Core Material | Ferrite |
| Shielding | Shielded |
| Mounting Type | Surface Mount |
| Package Footprint | 7.30mm x 7.30mm |
| Operating Temperature Range | -55°C to 125°C |
| Inductance Test Frequency | 1 kHz |
Substitute Part Grouping Explanation
Substitute parts for the SPD73-824M are qualified based on the following electrical and mechanical parameters:
Electrical Compatibility Criteria:
- Inductance value: 820 µH (matching specification)
- Inductance tolerance: ±20% (matching specification)
- Current rating: minimum 188 mA (equal or greater)
- DC resistance: maximum 6.54Ohm (equal or lower preferred)
- Core material: Ferrite (matching specification)
- Shielding: Shielded (matching specification)
- Test frequency: 1 kHz (matching specification)
Mechanical Compatibility Criteria:
- Mounting type: Surface Mount (matching specification)
- Package footprint: 7.30mm x 7.30mm (matching specification)
Two substitute parts meet these criteria: CDRH73NP-821MC-B (Sumida America Components Inc.) and SRR0745A-821M (Bourns Inc.).
Parameter Comparison
| Parameter | SPD73-824M (Main) | CDRH73NP-821MC-B | SRR0745A-821M |
|---|---|---|---|
| Manufacturer | API Delevan Inc. | Sumida America Components Inc. | Bourns Inc. |
| Inductance | 820 µH | 820 µH | 820 µH |
| Inductance Tolerance | ±20% | ±20% | ±20% |
| Current Rating (mA) | 188 | 180 | 220 |
| DC Resistance Max (Ohm) | 6.54 | 6.54 | 4.6 |
| Core Material | Ferrite | Ferrite | Ferrite |
| Shielding | Shielded | Shielded | Shielded |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount |
| Package Footprint (mm) | 7.30 x 7.30 | 7.30 x 7.30 | 7.30 x 7.30 |
| Height Seated Max (mm) | 3.90 | 3.40 | 4.70 |
| Operating Temperature Range | -55°C to 125°C | -40°C to 100°C | -40°C to 125°C |
| Product Status | Obsolete | Active | Active |
| RoHS Status | Non-compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
CDRH73NP-821MC-B (Sumida America Components Inc.): This substitute provides electrical equivalence with matching DC resistance (6.54Ohm max) and current rating (180 mA). The part is active and ROHS3 compliant. The operating temperature range (-40°C to 100°C) is narrower than the original, with a lower maximum temperature limit of 100°C compared to 125°C. Height is reduced to 3.40mm. This part is suitable for applications where the lower temperature ceiling does not conflict with system requirements.
SRR0745A-821M (Bourns Inc.): This substitute exceeds electrical specifications with a higher current rating (220 mA) and lower DC resistance (4.6Ohm max). The part is active, ROHS3 compliant, and carries AEC-Q200 automotive qualification. The operating temperature range (-40°C to 125°C) matches the upper limit of the original. Height is increased to 4.70mm. This part is suitable for applications requiring enhanced current handling and automotive-grade reliability.
Frequently Asked Questions (FAQ)
Q: Can CDRH73NP-821MC-B be used as a direct replacement for SPD73-824M? A: CDRH73NP-821MC-B meets the electrical and mechanical compatibility criteria. However, the operating temperature range is limited to -40°C to 100°C, compared to the original -55°C to 125°C. Verify that your application does not require operation below -40°C or above 100°C.
Q: Can SRR0745A-821M be used as a direct replacement for SPD73-824M? A: SRR0745A-821M meets all electrical and mechanical compatibility criteria. The current rating (220 mA) and lower DC resistance (4.6Ohm) exceed the original specifications. The operating temperature range (-40°C to 125°C) covers the upper limit of the original. Height is 4.70mm; verify PCB layout clearance.
Q: What are the key differences between the two substitutes? A: CDRH73NP-821MC-B maintains identical DC resistance (6.54Ohm) but has a narrower temperature range and lower current rating (180 mA). SRR0745A-821M provides superior electrical performance with lower DC resistance (4.6Ohm) and higher current rating (220 mA), with full temperature range coverage and automotive qualification.
Q: Are there any compliance differences? A: Both substitutes are ROHS3 compliant, whereas the original SPD73-824M is RoHS non-compliant. SRR0745A-821M carries AEC-Q200 automotive qualification; CDRH73NP-821MC-B does not.
Q: Will the height difference affect PCB assembly? A: CDRH73NP-821MC-B is 3.40mm (0.10mm shorter than original). SRR0745A-821M is 4.70mm (0.80mm taller than original). Verify clearance with your PCB layout and component placement constraints.
Q: What is the inductance test frequency for all parts? A: All parts are tested at 1 kHz, matching the original specification.
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