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SCMS5D14-821 Equivalent & Substitute Parts
Part Overview
The SCMS5D14-821 is a 820 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 120 mA continuous current with a maximum DC resistance of 20.2Ohm. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substitute parts must maintain the core electrical specification of 820 µH inductance at ±20% tolerance while accommodating variations in current rating, DC resistance, and physical dimensions based on application requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 820 µH |
| Inductance Tolerance | ±20% |
| Current Rating | 120 mA |
| Current - Saturation (Isat) | 125 mA |
| DC Resistance (DCR) | 20.2Ohm Max |
| Shielding | Shielded |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C ~ 125°C |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the SCMS5D14-821 is determined by the following criteria:
- Inductance Value: Must be 820 µH at ±20% tolerance
- Shielding: Must be shielded construction
- Mounting Type: Must be surface mount
- Current Rating: Must meet or exceed 120 mA continuous current requirement
- Saturation Current: Must meet or exceed 125 mA saturation specification
- Operating Temperature: Must support -40°C minimum and 125°C maximum range
- RoHS Compliance: Must meet ROHS3 or equivalent compliance level
Two substitute parts meet these criteria with variations in DC resistance, physical dimensions, and saturation current characteristics.
Parameter Comparison
| Parameter | SCMS5D14-821 | SCRH73-821 | SD12-821-R |
|---|---|---|---|
| Manufacturer | Signal Transformer | Signal Transformer | Eaton - Electronics Division |
| Inductance | 820 µH | 820 µH | 820 µH |
| Inductance Tolerance | ±20% | ±20% | ±20% |
| Current Rating (Amps) | 120 mA | 180 mA | 129 mA |
| Current - Saturation (Isat) | 125 mA | 180 mA | 95 mA |
| DC Resistance (DCR) | 20.2Ohm Max | 6.54Ohm Max | 14.93Ohm |
| Shielding | Shielded | Shielded | Shielded |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount |
| Size / Dimension | 5.20mm x 5.20mm | 7.80mm x 7.80mm | 5.20mm x 5.20mm |
| Height - Seated (Max) | 1.50mm | 4.60mm | 1.20mm |
| Product Status | Obsolete | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | RoHS Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
SCRH73-821 (Signal Transformer, Active Status)
This substitute provides the highest current rating at 180 mA with superior saturation current of 180 mA, exceeding the original specification. DC resistance is significantly reduced to 6.54Ohm Max, resulting in lower power dissipation. Operating temperature range matches the original part at -40°C ~ 125°C. ROHS3 compliance is maintained. Physical dimensions increase to 7.80mm x 7.80mm with 4.60mm height, requiring PCB layout verification for space-constrained applications.
SD12-821-R (Eaton - Electronics Division, Active Status)
This substitute maintains the original physical footprint of 5.20mm x 5.20mm with reduced height of 1.20mm. Current rating of 129 mA exceeds the original 120 mA requirement. DC resistance of 14.93Ohm is lower than the original 20.2Ohm specification. Operating temperature range is limited to -40°C ~ 85°C, which does not support the full 125°C maximum of the original part. RoHS compliance is maintained. Saturation current of 95 mA falls below the original 125 mA specification and requires application verification.
Frequently Asked Questions (FAQ)
Q: Can SCRH73-821 be used as a direct replacement for SCMS5D14-821?
A: SCRH73-821 meets all electrical substitution criteria including inductance, current rating, saturation current, and operating temperature range. Physical dimensions differ (7.80mm x 7.80mm vs. 5.20mm x 5.20mm), requiring PCB layout verification before implementation.
Q: What is the primary limitation of SD12-821-R as a substitute?
A: SD12-821-R has a maximum operating temperature of 85°C, which does not support the full 125°C upper temperature limit of the original SCMS5D14-821. Applications requiring operation above 85°C cannot use this substitute. Additionally, saturation current of 95 mA is below the original 125 mA specification.
Q: How does DC resistance affect substitute selection?
A: Lower DC resistance reduces power dissipation and heat generation. SCRH73-821 at 6.54Ohm and SD12-821-R at 14.93Ohm both provide lower resistance than the original 20.2Ohm specification, improving efficiency. Applications sensitive to voltage drop across the inductor may benefit from these lower resistance values.
Q: Are all substitutes RoHS compliant?
A: Yes. SCRH73-821 is ROHS3 compliant and SD12-821-R is RoHS compliant, meeting environmental and regulatory requirements equivalent to or exceeding the original SCMS5D14-821 ROHS3 compliance.
Q: What packaging options are available for substitute parts?
A: Both SCRH73-821 and SD12-821-R are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes.
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