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SC3DF-221 Equivalent & Substitute Parts
Part Overview
The SC3DF-221 is a 220 µH unshielded wirewound surface mount inductor manufactured by Signal Transformer, rated for 270 mA continuous current with a maximum DC resistance of 6.65Ohm. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 220 µH |
| Tolerance | ±20% |
| Current Rating | 270 mA |
| DC Resistance (DCR) | 6.65Ohm Max |
| Shielding | Unshielded |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C ~ 125°C |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the SC3DF-221 is determined by the following critical parameters:
- Inductance Value: Must be 220 µH with ±20% tolerance to maintain circuit performance
- Shielding Type: Must be unshielded to match electromagnetic characteristics
- Mounting Configuration: Must be surface mount to ensure PCB compatibility
- Current Rating: Substitute must support the application's current requirements without saturation
- DC Resistance: Lower DCR values improve efficiency; higher values increase power dissipation
- Environmental Compliance: RoHS3 compliance and operating temperature range must be maintained or exceeded
- Package Dimensions: Physical footprint must be compatible with existing PCB layouts
The P0770.224NLT from Pulse Electronics meets these substitution criteria with equivalent inductance and shielding characteristics.
Parameter Comparison
| Parameter | SC3DF-221 (Signal Transformer) | P0770.224NLT (Pulse Electronics) |
|---|---|---|
| Inductance | 220 µH | 220 µH |
| Tolerance | ±20% | ±20% |
| Current Rating (Amps) | 270 mA | 200 mA |
| Current - Saturation (Isat) | 130 mA | 220 mA |
| DC Resistance (DCR) | 6.65Ohm Max | 3.11Ohm Max |
| Shielding | Unshielded | Unshielded |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature Range | -40°C ~ 125°C | -40°C ~ 130°C |
| Size / Dimension | 0.256" L x 0.173" W (6.50mm x 4.40mm) | 0.260" L x 0.175" W (6.60mm x 4.45mm) |
| Height - Seated (Max) | 0.122" (3.10mm) | 0.115" (2.92mm) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Obsolete | Active |
Engineering Selection Recommendations
The P0770.224NLT is a direct functional equivalent for the SC3DF-221 based on matching inductance value, tolerance, shielding configuration, and surface mount packaging. Both components maintain ROHS3 compliance and MSL Level 1 ratings.
The P0770.224NLT offers advantages in active product status and improved DC resistance (3.11Ohm vs. 6.65Ohm), resulting in lower power dissipation. However, the continuous current rating is reduced from 270 mA to 200 mA, and saturation current increases from 130 mA to 220 mA. Physical dimensions are nearly identical with negligible variation in length, width, and height.
Selection should be based on circuit current requirements. Applications operating below 200 mA continuous current will benefit from the P0770.224NLT's superior efficiency and active availability. Applications requiring the full 270 mA rating must evaluate alternative sources or design modifications.
Frequently Asked Questions (FAQ)
Q: Can the P0770.224NLT directly replace the SC3DF-221 in all applications?
A: Direct replacement is possible only in applications where continuous current does not exceed 200 mA. The SC3DF-221 supports 270 mA continuous current, while the P0770.224NLT is rated for 200 mA. Verify circuit current requirements before substitution.
Q: What is the impact of the different DC resistance values?
A: The P0770.224NLT has significantly lower DC resistance (3.11Ohm vs. 6.65Ohm), reducing resistive losses and heat generation. This improves efficiency but does not affect inductance value or circuit functionality.
Q: Are the physical dimensions compatible with existing PCB layouts?
A: Yes. Both components have nearly identical footprints (6.50mm x 4.40mm vs. 6.60mm x 4.45mm) and are compatible with standard surface mount assembly processes. Height variation is minimal (3.10mm vs. 2.92mm).
Q: What is the significance of the different saturation current ratings?
A: Saturation current indicates the point at which inductance begins to degrade. The P0770.224NLT has a higher saturation current (220 mA vs. 130 mA), providing better performance margin in transient conditions.
Q: Are both components RoHS compliant?
A: Yes. Both the SC3DF-221 and P0770.224NLT are ROHS3 compliant with MSL Level 1 ratings, suitable for standard manufacturing and storage conditions.
Q: Why is the SC3DF-221 obsolete?
A: The SC3DF-221 is classified as obsolete by the manufacturer. The P0770.224NLT from Pulse Electronics is an active product with equivalent electrical specifications and ongoing availability.
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