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SPD74-333M Equivalent & Substitute Parts Reference
Part Overview
The SPD74-333M is a 33 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 1.6 A with a maximum DC resistance of 170 mOhm. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -55°C to 125°C and is mounted as a surface mount device in a nonstandard package configuration.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Inductance | 33 | µH |
| Inductance Tolerance | ±20% | % |
| Current Rating | 1.6 | A |
| DC Resistance (DCR) Maximum | 170 | mOhm |
| Shielding | Shielded | — |
| Core Material | Ferrite | — |
| Operating Temperature Range | -55 to 125 | °C |
| Mounting Type | Surface Mount | — |
| Physical Dimensions (L × W) | 7.30 × 7.30 | mm |
| Height (Seated Maximum) | 4.70 | mm |
Substitute Part Grouping Explanation
Substitution eligibility for the SPD74-333M is determined by the following critical parameters:
Primary Matching Criteria:
- Inductance value: 33 µH (fixed)
- Inductance tolerance: ±20% (fixed)
- Shielding: Shielded configuration required
- Core material: Ferrite
- Mounting type: Surface Mount
- Inductance test frequency: 1 kHz
Secondary Compatibility Criteria:
- Current rating: Substitute must equal or exceed 1.6 A
- DC resistance: Substitute must not exceed 170 mOhm maximum
- Operating temperature range: Substitute must cover or exceed -55°C to 125°C
- Physical footprint: Substitute dimensions must be compatible with -55°C to 125°C operating envelope
- Package configuration: Nonstandard surface mount package
All three substitute parts meet the primary matching criteria. Secondary criteria determine suitability for specific application requirements.
Parameter Comparison
| Parameter | SPD74-333M (Main) | HRSPD74-333M | SCB75C-330 | SRR0745A-330M |
|---|---|---|---|---|
| Manufacturer | API Delevan Inc. | API Delevan Inc. | Signal Transformer | Bourns Inc. |
| Inductance (µH) | 33 | 33 | 33 | 33 |
| Inductance Tolerance | ±20% | ±20% | ±20% | ±20% |
| Current Rating (A) | 1.6 | 0.98 | 1.52 | 1.35 |
| DC Resistance Maximum (mOhm) | 170 | 160 | 170 | 150 |
| Shielding | Shielded | Shielded | Shielded | Shielded |
| Core Material | Ferrite | Ferrite | Not specified | Ferrite |
| Operating Temperature Range (°C) | -55 to 125 | -55 to 130 | -40 to 125 | -40 to 125 |
| Inductance Test Frequency (kHz) | 1 | 100 | 1 | 1 |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Physical Dimensions L × W (mm) | 7.30 × 7.30 | 7.37 × 7.37 | 7.40 × 7.40 | 7.30 × 7.30 |
| Height Seated Maximum (mm) | 4.70 | 5.03 | 5.50 | 4.70 |
| Product Status | Obsolete | Active | Active | Active |
| RoHS Status | Non-compliant | Non-compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
HRSPD74-333M (API Delevan Inc.)
This substitute is an active product from the same manufacturer as the main part, offering direct design continuity. It features a lower current rating of 980 mA compared to the SPD74-333M's 1.6 A, making it suitable only for applications where the required current does not exceed 980 mA. The DC resistance is 160 mOhm, which is lower than the main part's 170 mOhm maximum. Operating temperature range extends to 130°C, providing additional thermal margin. The inductance test frequency differs at 100 kHz versus 1 kHz for the main part. Physical dimensions are marginally larger (7.37 × 7.37 mm versus 7.30 × 7.30 mm), and height is increased to 5.03 mm. RoHS non-compliance matches the main part's status.
SCB75C-330 (Signal Transformer)
This substitute provides a current rating of 1.52 A, which approaches the main part's 1.6 A specification. DC resistance matches at 170 mOhm maximum. Operating temperature range is -40°C to 125°C, which does not extend to the main part's lower limit of -55°C. Physical dimensions are 7.40 × 7.40 mm with a height of 5.50 mm, representing the largest footprint among substitutes. This part is ROHS3 compliant, offering regulatory advantage over the obsolete main part. Core material is not specified in the provided data.
SRR0745A-330M (Bourns Inc.)
This substitute offers the lowest DC resistance at 150 mOhm maximum and maintains physical dimensions identical to the main part (7.30 × 7.30 mm with 4.70 mm height). Current rating is 1.35 A, which is lower than the main part's 1.6 A but higher than HRSPD74-333M. Operating temperature range is -40°C to 125°C, not extending to -55°C. The part is ROHS3 compliant and carries AEC-Q200 automotive qualification. Ferrite core material is confirmed. Inductance test frequency is 1 kHz, matching the main part.
Frequently Asked Questions (FAQ)
Q: Can HRSPD74-333M replace SPD74-333M in all applications?
A: No. HRSPD74-333M has a maximum current rating of 980 mA, which is 38% lower than SPD74-333M's 1.6 A rating. It is suitable only for applications where the required current does not exceed 980 mA. Additionally, the inductance test frequency differs (100 kHz versus 1 kHz), which may affect performance in frequency-dependent circuits.
Q: Which substitute maintains the lowest operating temperature specification?
A: HRSPD74-333M extends the lower operating temperature to -55°C, matching the main part's specification. SCB75C-330 and SRR0745A-330M both have a lower limit of -40°C, which does not meet applications requiring -55°C operation.
Q: Are there RoHS compliance differences among the substitutes?
A: Yes. SPD74-333M and HRSPD74-333M are both RoHS non-compliant. SCB75C-330 and SRR0745A-330M are ROHS3 compliant, offering regulatory advantage for new designs or applications with RoHS requirements.
Q: How do physical dimensions compare?
A: SRR0745A-330M matches the main part exactly at 7.30 × 7.30 × 4.70 mm. HRSPD74-333M is slightly larger at 7.37 × 7.37 × 5.03 mm. SCB75C-330 is the largest at 7.40 × 7.40 × 5.50 mm. Verify PCB layout compatibility before substitution.
Q: What is the significance of inductance test frequency differences?
A: SPD74-333M, SCB75C-330, and SRR0745A-330M are tested at 1 kHz. HRSPD74-333M is tested at 100 kHz. Test frequency affects measured inductance values and may result in different performance characteristics in frequency-dependent applications. Confirm circuit operating frequency requirements before substitution.
Q: Which substitute has the best DC resistance performance?
A: SRR0745A-330M offers the lowest maximum DC resistance at 150 mOhm, compared to 170 mOhm for the main part and SCB75C-330, and 160 mOhm for HRSPD74-333M. Lower DC resistance reduces power dissipation in current-carrying applications.
Q: Is SRR0745A-330M suitable for automotive applications?
A: SRR0745A-330M carries AEC-Q200 automotive qualification, making it suitable for automotive-grade applications. The other substitutes do not list automotive certifications in the provided data.
Q: What current rating should I use for design margin calculations?
A: Use the lowest current rating among candidate substitutes for the specific application. HRSPD74-333M is limited to 980 mA, SRR0745A-330M to 1.35 A, and SCB75C-330 to 1.52 A. The main part SPD74-333M is rated for 1.6 A.
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