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SPD127R-273M
Part Overview
The SPD127R-273M is a fixed 27 µH shielded drum core, wirewound inductor manufactured by API Delevan Inc. designed for surface mount applications with a current rating of 3.4 A and maximum DC resistance of 60 mOhm. The part is currently active in production and carries full RoHS3 compliance with unlimited moisture sensitivity rating (MSL 1). Alternative components may be required due to supply chain considerations, inventory availability, or specific application requirements where electrical parameter tolerance ranges permit substitution.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 27 µH |
| Inductance Tolerance | ±20% |
| Current Rating (Amps) | 3.4 A |
| Current - Saturation (Isat) | 3.4 A |
| DC Resistance (DCR) | 60 mOhm Max |
| Core Material | Ferrite |
| Shielding | Shielded |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -55°C ~ 125°C |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
The SRR1208-270ML manufactured by Bourns Inc. qualifies as an electrical substitute for the SPD127R-273M based on the following critical parameters:
Matching Parameters:
- Inductance: 27 µH (identical specification)
- Inductance Tolerance: ±20% (identical specification)
- Core Type: Ferrite drum core, wirewound, shielded
- Surface Mount Configuration: Both parts are surface mount inductors
- RoHS3 Compliance: Both parts meet ROHS3 Compliant requirement
- Moisture Sensitivity Level: MSL 1 (Unlimited) for both parts
Differing Parameters Within Acceptable Range:
- Current Rating: SPD127R-273M rated at 3.4 A; SRR1208-270ML rated at 3 A
- DC Resistance: SPD127R-273M has 60 mOhm Max; SRR1208-270ML has 48 mOhm Max (lower is acceptable)
- Operating Temperature: SPD127R-273M operates -55°C ~ 125°C; SRR1208-270ML operates -40°C ~ 125°C
- Physical Dimensions: Minor variations in form factor (12.00mm vs 12.70mm width; 8.00mm vs 8.50mm height)
The SRR1208-270ML maintains the core electrical specifications required for 27 µH inductor applications, with the saturation current rating of 4.3 A providing adequate design margin for the primary part's 3.4 A specification.
Parameter Comparison
| Parameter | SPD127R-273M | SRR1208-270ML | Compatibility Notes |
|---|---|---|---|
| Manufacturer | API Delevan Inc. | Bourns Inc. | Different manufacturers |
| Inductance | 27 µH | 27 µH | Exact match |
| Inductance Tolerance | ±20% | ±20% | Exact match |
| Current Rating (Amps) | 3.4 A | 3 A | SRR1208 rated 0.4 A lower |
| Current - Saturation (Isat) | 3.4 A | 4.3 A | SRR1208 provides higher margin |
| DC Resistance (DCR) | 60 mOhm Max | 48 mOhm Max | SRR1208 has lower DCR |
| Core Material | Ferrite | Ferrite | Exact match |
| Shielding | Shielded | Shielded | Exact match |
| Mounting Type | Surface Mount | Surface Mount | Exact match |
| Operating Temperature Range | -55°C ~ 125°C | -40°C ~ 125°C | SRR1208 has narrower range |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Exact match |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | Exact match |
| Size/Dimension (L x W) | 12.00mm x 12.00mm | 12.70mm x 12.70mm | SRR1208 slightly larger |
| Height - Seated (Max) | 8.00mm | 8.50mm | SRR1208 0.5mm taller |
Engineering Selection Recommendations
The SRR1208-270ML is electrically compatible with the SPD127R-273M for applications where the 3 A current rating is sufficient and operating temperature does not require extended low-temperature performance below -40°C. Both components carry active product status and ROHS3 compliance with MSL 1 ratings, ensuring equivalent regulatory and environmental qualification.
Selection of SRR1208-270ML is appropriate where inventory availability, lead time, or cost considerations justify the substitution. The lower DC resistance of the SRR1208-270ML (48 mOhm vs 60 mOhm) and higher saturation current margin (4.3 A vs 3.4 A) may provide advantages in power efficiency applications. Circuit board layout must accommodate the slightly larger physical footprint (12.70mm x 12.70mm with 8.50mm height vs 12.00mm x 12.00mm with 8.00mm height).
Frequently Asked Questions (FAQ)
Q: Are SPD127R-273M and SRR1208-270ML functionally equivalent?
A: Yes, both inductors provide 27 µH inductance at ±20% tolerance with ferrite shielded drum core construction. The SRR1208-270ML operates at a rated current 0.4 A lower (3 A vs 3.4 A), but its higher saturation current of 4.3 A provides design margin for most applications. DC resistance is lower on the SRR1208-270ML (48 mOhm vs 60 mOhm), which reduces resistive losses.
Q: What are the key differences in operating temperature ranges?
A: The SPD127R-273M operates from -55°C to 125°C, while the SRR1208-270ML operates from -40°C to 125°C. Applications requiring operation below -40°C must use the SPD127R-273M.
Q: Do the physical dimension differences affect PCB layout?
A: The SRR1208-270ML is slightly larger: 12.70mm x 12.70mm footprint with 8.50mm seated height versus 12.00mm x 12.00mm with 8.00mm for the SPD127R-273M. PCB layout must accommodate these dimensional differences, particularly in height-constrained applications.
Q: Are both parts RoHS3 compliant?
A: Yes, both the SPD127R-273M and SRR1208-270ML are ROHS3 Compliant with MSL 1 (Unlimited) moisture sensitivity rating.
Q: What packaging formats are available for each part?
A: The SPD127R-273M is supplied in Tape & Reel (TR) packaging. The SRR1208-270ML is available in Cut Tape (CT) and Digi-Reel® packaging formats.
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