1812-123J Fixed Inductor Equivalent & Substitute Parts

Part Overview

The 1812-123J is a fixed unshielded inductor manufactured by API Delevan Inc., rated for 12 µH inductance with a maximum current rating of 317 mA and 2 Ohm maximum DC resistance. This surface mount component operates across the temperature range of -55°C to 125°C and is currently in active product status. Identifying equivalent and substitute parts becomes necessary when the primary variant is unavailable, when specific compliance certifications are required for end applications, or when inventory constraints necessitate sourcing from alternative manufacturing batches or series within the same electrical and mechanical specifications.

Substiute Parts

1812-123J

API Delevan Inc.In Stock: 26631812-123J Datasheet

Current PartRFQ

1812R-123J

API Delevan Inc.In Stock: 243901812R-123J Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 1812R-123J qualifies as a direct equivalent and substitute for the 1812-123J based on identical electrical and mechanical parameters. Substitution eligibility is determined by the following key parameters that must match or be compatible:

• Inductance Value: 12 µH (±5% tolerance maintained)
• Current Rating: 317 mA maximum
• DC Resistance: 2 Ohm maximum
• Package / Case: 1812 (4532 Metric) surface mount
• Physical Dimensions: 0.177" L x 0.126" W, height 0.134" maximum
• Core Material: Ferrite unshielded
• Operating Temperature: -55°C to 125°C
• Q Factor and Frequency Characteristics: 50 @ 2.5 MHz, 18 MHz self-resonant frequency

The 1812R-123J belongs to the 1812R series, representing an updated manufacturing series from the original 1812 series while maintaining full electrical and mechanical compatibility across all specified parameters.

Parameter Comparison

Engineering Selection Recommendations

Both the 1812-123J and 1812R-123J are active products with identical electrical and mechanical specifications, making them interchangeable for circuit-level applications. The primary differentiator between these parts is compliance status: the 1812R-123J meets ROHS3 compliance requirements, whereas the 1812-123J is RoHS non-compliant. Selection between these equivalents should be determined by application compliance requirements and regulatory mandates governing the end product. The 1812R-123J series offers higher current inventory availability at 24,351 pieces compared to the 1812-123J at 2,600 pieces. Both parts maintain identical REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Are the 1812-123J and 1812R-123J electrically interchangeable? A: Yes. Both parts share identical inductance values (12 µH ±5%), current ratings (317 mA), DC resistance (2 Ohm maximum), Q factors (50 @ 2.5 MHz), and self-resonant frequency characteristics (18 MHz).

Q: Can the 1812R-123J be used as a direct replacement for the 1812-123J in existing designs? A: Yes, on a pin-for-pin and footprint basis. The 1812R-123J maintains the same 1812 (4532 Metric) package, physical dimensions (0.177" L x 0.126" W, 0.134" height maximum), and surface mount mounting type.

Q: What is the significance of the RoHS compliance difference? A: The 1812R-123J is ROHS3 compliant, meeting restriction of hazardous substances standards, while the 1812-123J is non-compliant. Applications subject to RoHS regulations must use the 1812R-123J variant.

Q: Do both parts have the same temperature operating range? A: Yes. Both the 1812-123J and 1812R-123J operate across -55°C to 125°C with identical temperature performance characteristics.

Q: Are there any differences in moisture sensitivity between these parts? A: No. Both parts have Moisture Sensitivity Level 1 (Unlimited), indicating no moisture absorption concerns during storage or handling.

Q: What is the physical footprint compatibility between these inductors? A: Both parts use the 1812 (4532 Metric) package with identical external dimensions and height specifications, ensuring complete PCB footprint compatibility.