SC1212-102 Equivalent & Substitute Parts

Part Overview

The SC1212-102 is a 1 mH shielded surface mount inductor manufactured by Signal Transformer, rated for 145 mA maximum current with 12 Ohm DC resistance. This component is classified as obsolete, making equivalent or substitute parts necessary for ongoing production and maintenance applications. The shielded design and specific electrical characteristics define the scope for identifying compatible alternatives.

Substiute Parts

SC1212-102

Signal TransformerIn Stock: 901SC1212-102 Datasheet

Current PartRFQ

1812R-105K

API Delevan Inc.In Stock: 8221812R-105K Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SC1212-102 is constrained by the following critical parameters:

• Inductance Value: Must be 1 mH (primary electrical specification)
• Current Rating: Substitute must support minimum 145 mA operation
• DC Resistance: Lower DCR values are acceptable; higher values may impact circuit performance
• Shielding Requirement: Shielded construction preferred to maintain electromagnetic isolation
• Mounting: Surface mount technology required
• Compliance: RoHS3 compliance mandatory for regulatory alignment

The 1812R-105K from API Delevan Inc. shares the core inductance value of 1 mH and surface mount configuration. However, critical differences exist in current rating, DC resistance, and shielding characteristics that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The 1812R-105K presents significant trade-offs when considered as a substitute for the SC1212-102:

Advantages: The 1812R-105K maintains the 1 mH inductance specification and offers tighter tolerance (±10% vs ±30%), improved temperature range (-55°C vs -40°C minimum), and active product status ensuring continued availability. Both components meet ROHS3 compliance requirements.

Limitations: The 1812R-105K current rating of 55 mA is substantially lower than the SC1212-102's 145 mA rating, making it unsuitable for applications requiring the full current capacity of the original part. The DC resistance of 60 Ohm Max is five times higher than the 12 Ohm Max specification, introducing significant power dissipation differences. The unshielded construction differs from the shielded design of the original component, potentially affecting electromagnetic compatibility in sensitive applications.

Selection of the 1812R-105K as a substitute is limited to applications where current requirements do not exceed 55 mA and where increased DC resistance and lack of shielding are acceptable design trade-offs.

Frequently Asked Questions (FAQ)

Q: Can the 1812R-105K directly replace the SC1212-102 in all applications?

A: No. The 1812R-105K has a maximum current rating of 55 mA compared to the SC1212-102's 145 mA rating. Direct substitution is only viable for circuits operating below 55 mA. Additionally, the unshielded design may not be suitable for applications requiring electromagnetic isolation.

Q: What is the impact of the higher DC resistance in the 1812R-105K?

A: The 1812R-105K's 60 Ohm Max DCR versus the SC1212-102's 12 Ohm Max DCR results in five times greater resistive losses. In circuits carrying the full 145 mA current, this would generate significantly more heat and voltage drop across the inductor.

Q: Does the tighter tolerance of the 1812R-105K make it a better choice?

A: Tighter tolerance (±10% vs ±30%) is beneficial for precision applications, but this advantage is negated if the current rating or DC resistance specifications are incompatible with the circuit design.

Q: Are there package compatibility concerns between these parts?

A: Yes. The SC1212-102 uses a nonstandard package while the 1812R-105K uses a 2-SMD package. Physical dimensions differ (4.60mm x 4.60mm vs 3.20mm x 3.20mm), and height specifications vary (2.30mm vs 4.83mm). PCB layout and footprint modifications may be required.

Q: Why is the SC1212-102 obsolete?

A: The SC1212-102 is listed as obsolete by the manufacturer. The 1812R-105K from API Delevan Inc. maintains active product status, ensuring ongoing availability and support.

Q: What compliance certifications apply to both parts?

A: Both the SC1212-102 and 1812R-105K are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.