S1812-474K Equivalent & Substitute Parts

Part Overview

The S1812-474K is a fixed surface-mount inductor manufactured by API Delevan Inc. with a 470 µH inductance rating and 91 mA current capacity. This shielded ferrite-core inductor is classified as Active product status and is designed for applications requiring compact form factor and consistent electrical performance within the 1812 (4532 Metric) package specification. Equivalent and substitute parts are necessary to ensure design continuity, optimize procurement flexibility, and manage supply chain variations while maintaining identical electrical and mechanical performance.

Key Parameters

Parameter	S1812-474K
Inductance	470 µH
Inductance Tolerance	±10%
Current Rating	91 mA
DC Resistance (Max)	24 Ohm
Q @ Frequency	40 @ 790 kHz
Frequency - Self Resonant	3.3 MHz
Shielding	Shielded
Package / Case	1812 (4532 Metric)
Size / Dimension	0.177" L x 0.126" W (4.50 mm x 3.20 mm)
Height - Seated (Max)	0.134" (3.40 mm)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Material - Core	Ferrite

Substitute Part Grouping Explanation

Substitution eligibility for the S1812-474K is determined by strict equivalence across all electrical and mechanical parameters. The following criteria establish valid substitution relationships:

Critical Matching Parameters:

Inductance: 470 µH (fixed value, no range variation)
Inductance Tolerance: ±10%
Current Rating: 91 mA (minimum required)
DC Resistance: 24 Ohm Maximum
Q Factor: 40 @ 790 kHz
Self Resonant Frequency: 3.3 MHz
Package / Case: 1812 (4532 Metric)
Mounting Type: Surface Mount
Core Material: Ferrite
Shielding: Shielded

Parts are grouped as direct substitutes when all listed parameters match the S1812-474K specification. Series variations within the same manufacturer lineup (such as the S1812R series) qualify for substitution when electrical parameters remain identical.

Parameter Comparison

Parameter	S1812-474K	S1812R-474K	Equivalence
Inductance	470 µH	470 µH	Matched
Inductance Tolerance	±10%	±10%	Matched
Current Rating	91 mA	91 mA	Matched
DC Resistance (Max)	24 Ohm	24 Ohm	Matched
Q @ Frequency	40 @ 790 kHz	40 @ 790 kHz	Matched
Frequency - Self Resonant	3.3 MHz	3.3 MHz	Matched
Shielding	Shielded	Shielded	Matched
Package / Case	1812 (4532 Metric)	1812 (4532 Metric)	Matched
Size / Dimension	0.177" L x 0.126" W (4.50 mm x 3.20 mm)	0.177" L x 0.126" W (4.50 mm x 3.20 mm)	Matched
Height - Seated (Max)	0.134" (3.40 mm)	0.134" (3.40 mm)	Matched
Mounting Type	Surface Mount	Surface Mount	Matched
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	Matched
Material - Core	Ferrite	Ferrite	Matched

Engineering Selection Recommendations

S1812-474K: This part is classified as Active product status with RoHS non-compliance and REACH Unaffected status. It is suitable for applications where RoHS compliance is not required.

S1812R-474K: This part is classified as Active product status with ROHS3 Compliance and REACH Unaffected status. The S1812R-474K represents an alternative within the same series that provides equivalent electrical and mechanical performance with improved regulatory compliance. Selection should prioritize ROHS3-compliant S1812R-474K for designs targeting current RoHS regulatory requirements.

Both parts are manufactured by API Delevan Inc. and maintain identical electrical characteristics, making them functionally interchangeable in circuit design. Supply availability differs between variants, with S1812R-474K showing higher stock levels (1633 Pcs) compared to S1812-474K (742 Pcs).

Frequently Asked Questions (FAQ)

Can S1812R-474K be used as a direct replacement for S1812-474K?

Yes, the S1812R-474K is a direct substitute. Both parts provide 470 µH inductance, 91 mA current rating, and 24 Ohm maximum DC resistance in identical 1812 (4532 Metric) surface-mount packages. All electrical parameters including Q factor, self-resonant frequency, and operating temperature range are matched.

What is the key difference between S1812-474K and S1812R-474K?

The primary difference is regulatory compliance status. The S1812R-474K meets ROHS3 compliance, while the S1812-474K is RoHS non-compliant. Electrically and mechanically, both parts are equivalent.

Are there package or mounting considerations when substituting these parts?

No. Both the S1812-474K and S1812R-474K use identical 1812 (4532 Metric) surface-mount packages with matching physical dimensions (0.177" L x 0.126" W, 4.50 mm x 3.20 mm) and maximum seated height (0.134" / 3.40 mm). They are PCB-compatible without layout modifications.

Does substitution affect circuit performance?

No. All specified electrical parameters match between the parts, including inductance tolerance (±10%), DC resistance (24 Ohm Max), Q factor (40 @ 790 kHz), and self-resonant frequency (3.3 MHz). Circuit behavior remains identical across the operating temperature range of -55°C to 125°C.

Which part should be selected for new designs?

For designs subject to RoHS compliance requirements, the S1812R-474K is the appropriate selection. For applications without RoHS compliance constraints, either part is acceptable based on availability and procurement requirements.

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