Equivalent & Substitute Parts for S1812-124K

Part Overview

The S1812-124K is a fixed shielded inductor manufactured by API Delevan Inc., rated at 120 µH inductance with a maximum current rating of 163 mA and DC resistance of 7.5Ohm. This component is designed for surface mount applications in the 1812 (4532 Metric) package format. The part is currently active in production with 1081 pieces available in inventory.

Substitute parts are identified when electrical and mechanical parameters remain within the specified tolerances and operational ranges, ensuring functional equivalence in circuit applications. The primary substitute for this component is the S1812R-124K, which maintains identical electrical specifications while offering improved compliance status.

Substiute Parts

S1812-124K

API Delevan Inc.In Stock: 1096S1812-124K Datasheet

Current PartRFQ

S1812R-124K

API Delevan Inc.In Stock: 2281S1812R-124K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the S1812-124K is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

• Inductance: 120 µH at ±10% tolerance
• Current Rating: 163 mA minimum
• DC Resistance: 7.5Ohm maximum
• Q Factor: 40 @ 790 kHz
• Self Resonant Frequency: 6 MHz
• Operating Temperature Range: -55°C to 125°C

Mechanical Parameters (Must Match):

• Package / Case: 1812 (4532 Metric)
• Mounting Type: Surface Mount
• Shielding: Shielded
• Core Material: Ferrite

Compliance Parameters (May Differ):

• RoHS Status
• Product Status (Active)

The S1812R-124K qualifies as a direct substitute because it maintains identical electrical and mechanical specifications while offering enhanced compliance characteristics.

Parameter Comparison

Engineering Selection Recommendations

S1812-124K Selection Criteria:

• Use when RoHS non-compliant components are acceptable for the application
• Current inventory: 1081 pieces available
• Product status: Active

S1812R-124K Selection Criteria:

• Use for applications requiring ROHS3 compliance
• Preferred for new designs and long-term supply chain stability
• Current inventory: 2252 pieces available (higher stock level)
• Product status: Active
• Identical electrical and mechanical performance to S1812-124K

Both parts are manufactured by API Delevan Inc. and maintain active production status. The S1812R-124K offers superior compliance positioning and greater inventory availability while maintaining complete electrical and mechanical equivalence.

Frequently Asked Questions (FAQ)

Q: Can S1812R-124K replace S1812-124K in existing designs?

A: Yes. The S1812R-124K is electrically and mechanically identical to the S1812-124K. All electrical parameters, including inductance (120 µH), current rating (163 mA), DC resistance (7.5Ohm max), and operating temperature range (-55°C to 125°C) are equivalent. The package format (1812 / 4532 Metric) and mounting type (Surface Mount) are identical, enabling direct substitution without circuit redesign.

Q: What is the difference between S1812-124K and S1812R-124K?

A: The primary difference is RoHS compliance status. The S1812-124K is RoHS non-compliant, while the S1812R-124K is ROHS3 compliant. All other specifications—inductance, tolerance, current rating, DC resistance, Q factor, self resonant frequency, operating temperature, package, and shielding—are identical.

Q: Are both parts suitable for the same PCB assembly process?

A: Yes. Both parts use identical Surface Mount packaging in the 1812 (4532 Metric) format with the same physical dimensions (0.177" L x 0.126" W / 4.50mm x 3.20mm) and maximum seated height (0.134" / 3.40mm). They are compatible with standard SMD assembly equipment and processes.

Q: Which part should be selected for new product designs?

A: The S1812R-124K is recommended for new designs due to ROHS3 compliance and higher inventory availability (2252 pieces vs. 1081 pieces). Both parts maintain active production status and identical electrical performance.

Q: Are there any frequency-dependent differences between these parts?

A: No. Both parts have identical Q factor specifications (40 @ 790 kHz) and self resonant frequency (6 MHz). The inductance test frequency is 790 kHz for both parts. Frequency-dependent behavior is equivalent.

Q: What is the moisture sensitivity level for both parts?

A: Both S1812-124K and S1812R-124K have Moisture Sensitivity Level (MSL) of 1, indicating unlimited moisture sensitivity rating. Storage and handling requirements are identical.