S1812-561K Equivalent & Substitute Parts

Part Overview

The S1812-561K is a 560 nH shielded surface mount inductor manufactured by API Delevan Inc., rated for 735 mA continuous current with a maximum DC resistance of 370 mOhm. This component is designed for high-frequency applications requiring compact form factor and electromagnetic shielding in the 1812 (4532 Metric) package.

The S1812-561K carries an Obsolete product status. Identification of equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this inductor specification.

Substiute Parts

S1812-561K

API Delevan Inc.In Stock: 1003S1812-561K Datasheet

Current PartRFQ

S1812R-561K

API Delevan Inc.In Stock: 1118S1812R-561K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the S1812-561K is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

• Inductance value: 560 nH
• Inductance tolerance: ±10%
• Current rating: 735 mA minimum
• DC resistance: 370 mOhm maximum
• Q factor @ 25 MHz: 40
• Self resonant frequency: 185 MHz
• Operating temperature range: -55°C to 125°C

Mechanical Parameters (Must Match):

• Package type: 1812 (4532 Metric)
• Mounting type: Surface Mount
• Core material: Iron
• Shielding: Shielded

Functional Parameters (Must Match):

• Inductance test frequency: 25 MHz

The substitute part S1812R-561K meets all electrical, mechanical, and functional requirements for direct substitution. The primary distinction is product status and packaging format, with the substitute part being Active and available in Tape & Reel packaging.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: S1812R-561K

The S1812R-561K is the direct electrical and mechanical equivalent of the S1812-561K. Selection of this substitute part is justified on the following basis:

1. Product Status: The S1812R-561K maintains Active product status, ensuring long-term availability and supply chain continuity compared to the Obsolete S1812-561K.

2. Electrical Equivalence: All critical electrical parameters—inductance, tolerance, current rating, DC resistance, Q factor, and self resonant frequency—are identical to the original part.

3. Mechanical Compatibility: Package type, mounting type, core material, shielding configuration, and physical dimensions are identical, enabling direct PCB layout compatibility without redesign.

4. Regulatory Compliance: The S1812R-561K achieves ROHS3 compliance, whereas the original part is non-compliant. This distinction is relevant for applications subject to RoHS regulations.

5. Packaging Availability: The substitute part is available in Tape & Reel format, supporting automated assembly processes and volume production requirements.

The S1812R-561K is suitable for direct substitution in all applications where the S1812-561K was originally specified, with no circuit modifications or performance degradation.

Frequently Asked Questions (FAQ)

Q1: Can the S1812R-561K be used as a direct replacement for the S1812-561K without circuit modifications?

A: Yes. The S1812R-561K is electrically and mechanically equivalent to the S1812-561K across all specified parameters. No circuit modifications are required. The component occupies identical PCB footprint space and operates within the same electrical performance envelope.

Q2: What is the difference between the S1812-561K and S1812R-561K part numbers?

A: The primary differences are product status and packaging format. The S1812-561K is Obsolete and supplied in standard packaging, while the S1812R-561K is Active and supplied in Tape & Reel format. The "R" designation in the part number indicates the Tape & Reel packaging option. All electrical and mechanical specifications are identical.

Q3: Are there any compliance differences between these parts?

A: Yes. The S1812R-561K is ROHS3 compliant, while the S1812-561K is RoHS non-compliant. Both parts are REACH Unaffected and classified as EAR99. If your application requires RoHS compliance, the S1812R-561K is the appropriate selection.

Q4: Will the S1812R-561K work in the same PCB footprint as the S1812-561K?

A: Yes. Both parts use the 1812 (4532 Metric) package with identical physical dimensions: 4.50 mm length, 3.20 mm width, and 3.40 mm maximum seated height. No PCB layout modifications are necessary.

Q5: What is the current rating specification, and does it apply to both parts?

A: Both parts are rated for 735 mA continuous current with a maximum DC resistance of 370 mOhm. This specification applies identically to the S1812-561K and S1812R-561K.

Q6: Are there any frequency-dependent performance differences?

A: No. Both parts exhibit identical frequency characteristics: Q factor of 40 at 25 MHz test frequency and self resonant frequency of 185 MHz. Performance in high-frequency applications is equivalent.

Q7: What is the operating temperature range for these inductors?

A: Both the S1812-561K and S1812R-561K operate across the temperature range of -55°C to 125°C. This specification is identical for both parts.

Q8: Is the Tape & Reel packaging of the S1812R-561K compatible with automated assembly equipment?

A: Yes. Tape & Reel packaging is the standard format for automated surface mount assembly processes. The S1812R-561K in Tape & Reel format is compatible with standard pick-and-place equipment and reflow soldering processes.