Request Quote
(Ships tomorrow)
SC73B-221 Equivalent & Substitute Parts
Part Overview
The SC73B-221 is a 220 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 540 mA continuous current with a maximum DC resistance of 1.2Ohm. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent inductance values, current ratings, and operating temperature ranges meet or exceed the original specification requirements while maintaining surface mount compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 220 µH |
| Tolerance | ±20% |
| Current Rating | 540 mA |
| DC Resistance (Max) | 1.2Ohm |
| Saturation Current | 310 mA |
| Shielding | Unshielded |
| Operating Temperature | -40°C ~ 125°C |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the SC73B-221 is determined by the following criteria:
- Inductance Match: Substitute parts must maintain 220 µH ±20% tolerance specification
- Current Rating: Substitute parts must support minimum 540 mA continuous current rating
- DC Resistance: Substitute parts must not exceed 1.2Ohm maximum DC resistance
- Saturation Current: Substitute parts must maintain saturation current at or above 310 mA
- Operating Temperature Range: Substitute parts must cover or exceed -40°C ~ 125°C operating window
- Mounting Configuration: Substitute parts must be surface mount compatible
- Compliance: Substitute parts must maintain RoHS3 compliance status
The SPD74R-224M qualifies as a direct substitute based on matching inductance value, exceeding current rating specifications (600 mA vs. 540 mA requirement), maintaining DC resistance within acceptable limits (1.17Ohm vs. 1.2Ohm maximum), and meeting all compliance requirements.
Parameter Comparison
| Parameter | SC73B-221 (Main Part) | SPD74R-224M (Substitute) | Compatibility |
|---|---|---|---|
| Manufacturer | Signal Transformer | API Delevan Inc. | Different manufacturer |
| Inductance | 220 µH | 220 µH | Match |
| Tolerance | ±20% | ±20% | Match |
| Current Rating (Amps) | 540 mA | 600 mA | Substitute exceeds requirement |
| Saturation Current | 310 mA | 600 mA | Substitute exceeds requirement |
| DC Resistance (Max) | 1.2Ohm | 1.17Ohm | Substitute meets specification |
| Shielding | Unshielded | Shielded | Substitute provides additional shielding |
| Operating Temperature | -40°C ~ 125°C | -55°C ~ 125°C | Substitute extends lower temperature range |
| Mounting Type | Surface Mount | Surface Mount | Match |
| Package / Case | Nonstandard | Nonstandard | Match |
| RoHS Status | RoHS3 Compliant | RoHS3 Compliant | Match |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | Match |
| REACH Status | REACH Unaffected | REACH Unaffected | Match |
Engineering Selection Recommendations
The SPD74R-224M from API Delevan Inc. is qualified as a direct substitute for the SC73B-221. Both components maintain Active product status and full RoHS3 compliance. The substitute part provides enhanced electrical performance through higher current rating (600 mA vs. 540 mA) and improved saturation current (600 mA vs. 310 mA), while maintaining equivalent DC resistance characteristics. The SPD74R-224M incorporates shielded construction and extends the lower operating temperature limit to -55°C, offering additional design margin for temperature-sensitive applications. Both components are surface mount compatible with nonstandard package configurations and unlimited moisture sensitivity ratings.
Frequently Asked Questions (FAQ)
Q: Can the SPD74R-224M replace the SC73B-221 in existing designs?
A: Yes. The SPD74R-224M meets all electrical specifications of the SC73B-221, including inductance value, tolerance, current rating, and DC resistance. Both components are RoHS3 compliant and surface mount compatible.
Q: What is the difference between shielded and unshielded construction in these inductors?
A: The SC73B-221 is unshielded wirewound, while the SPD74R-224M is shielded drum core wirewound. Shielded construction reduces electromagnetic interference emission and susceptibility, beneficial in noise-sensitive applications. Both configurations support the same inductance and current specifications.
Q: Does the SPD74R-224M have better performance than the SC73B-221?
A: The SPD74R-224M provides higher saturation current (600 mA vs. 310 mA) and extended lower temperature operation (-55°C vs. -40°C minimum). DC resistance is equivalent (1.17Ohm vs. 1.2Ohm maximum). Selection depends on application requirements for thermal range and saturation margin.
Q: Are there packaging differences between these parts?
A: Both components use nonstandard surface mount packages. Physical dimensions differ slightly: SC73B-221 measures 8.10mm × 7.30mm × 4.50mm height, while SPD74R-224M measures 7.30mm × 7.30mm × 4.70mm height. Verify PCB layout compatibility before substitution.
Q: What compliance certifications apply to both parts?
A: Both the SC73B-221 and SPD74R-224M are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Moisture sensitivity level is 1 (unlimited) for both components.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts