SC73-221 Equivalent & Substitute Parts

Part Overview

The SC73-221 is a 220 µH unshielded wirewound inductor manufactured by Signal Transformer, designed for surface mount applications with a current rating of 540 mA and maximum DC resistance of 1.2Ohm. This component is classified as Active product status and is RoHS3 compliant. Equivalent parts are identified when design requirements permit substitution based on matching electrical specifications and mechanical compatibility within the same package category.

Substiute Parts

SC73-221

Signal TransformerIn Stock: 930SC73-221 Datasheet

Current PartRFQ

SPD74R-224M

API Delevan Inc.In Stock: 1352SPD74R-224M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC73-221 is determined by the following critical parameters:

• Inductance Value: 220 µH nominal with ±20% tolerance
• Current Rating: Minimum 540 mA to maintain circuit performance
• DC Resistance: Maximum 1.2Ohm to ensure acceptable power dissipation
• Mounting Type: Surface mount configuration required
• Operating Temperature: -40°C to 125°C minimum range
• Compliance: RoHS3 and REACH status alignment

The SPD74R-224M meets these substitution criteria with equivalent inductance, higher current rating capability, and compatible surface mount packaging.

Parameter Comparison

Engineering Selection Recommendations

Both SC73-221 and SPD74R-224M are Active product status components with full RoHS3 compliance and REACH unaffected status, ensuring regulatory alignment for current and future applications. The SPD74R-224M provides enhanced performance margins with 600 mA current rating versus 540 mA, lower DC resistance of 1.17Ohm, and extended lower temperature operation to -55°C. The shielded construction of the SPD74R-224M offers additional electromagnetic interference mitigation compared to the unshielded SC73-221. Physical dimensions differ slightly; the SPD74R-224M is more compact in length and width but taller in height. Component selection should account for available PCB space and electromagnetic environment requirements.

Frequently Asked Questions (FAQ)

Q: Can SPD74R-224M directly replace SC73-221 in existing designs?

A: Electrical substitution is valid based on matching 220 µH inductance, ±20% tolerance, and exceeding the 540 mA current requirement. Physical footprint differences require PCB layout verification; the SPD74R-224M is 0.80mm shorter in length, 0.80mm shorter in width, but 0.90mm taller in height.

Q: What is the significance of shielding differences between these parts?

A: SC73-221 is unshielded, while SPD74R-224M is shielded. Shielded construction reduces radiated electromagnetic interference. Selection depends on circuit noise immunity requirements and PCB layout constraints.

Q: Are both parts suitable for the same temperature range applications?

A: SC73-221 operates -40°C to 125°C. SPD74R-224M extends to -55°C minimum, providing broader low-temperature capability. Both support the standard -40°C to 125°C range.

Q: How do DC resistance values affect circuit performance?

A: SC73-221 specifies 1.2Ohm maximum; SPD74R-224M specifies 1.17Ohm maximum. Lower resistance reduces power dissipation and heat generation. Both values are within acceptable range for 220 µH inductor applications.

Q: What packaging considerations apply to these surface mount inductors?

A: Both components use Tape & Reel (TR) packaging with MSL 1 (Unlimited) moisture sensitivity, indicating no special moisture control requirements during storage or handling.