1812-333K Equivalent & Substitute Parts Reference

Part Overview

The 1812-333K is a fixed unshielded inductor manufactured by API Delevan Inc., rated for 33 µH inductance with a maximum current capability of 224 mA and 4 Ohm maximum DC resistance in a 1812 (4532 Metric) surface mount package. The component is currently in active production status with 781 pieces available in stock.

Substitute components become necessary when the primary part number experiences supply constraints, extended lead times, or when design requirements permit operation within the electrical and mechanical tolerances of alternative manufacturers' offerings.

Key Parameters

Parameter	1812-333K Value
Inductance	33 µH
Current Rating	224 mA
DC Resistance (Max)	4 Ohm
Package / Case	1812 (4532 Metric)
Tolerance	±10%
Operating Temperature Range	-55°C ~ 125°C
Shielding	Unshielded
Q @ Frequency	50 @ 2.5 MHz
Self Resonant Frequency	11 MHz

Substitute Part Grouping Explanation

The substitute parts CM453232-330JL and CM453232-330KL (both Bourns Inc.) are electrically compatible alternatives based on the following substitution criteria:

Matching Parameters (Mandatory for substitution):

Inductance: 33 µH (exact match)
Package / Case: 1812 (4532 Metric) (exact match)
DC Resistance (Max): 4 Ohm (exact match)
Shielding: Unshielded (exact match)
Mounting Type: Surface Mount (exact match)
Self Resonant Frequency: 11 MHz (exact match)
Q @ Frequency: 50 @ 2.52 MHz (equivalent performance)

Varying Parameters (within allowable design margins):

Current Rating: 160 mA (substitute parts) vs. 224 mA (primary part). Substitutes are rated at 72% of primary part current capacity and must be evaluated for application current requirements.
Operating Temperature Range: -40°C ~ 125°C (substitute parts) vs. -55°C ~ 125°C (primary part). Substitutes have a narrower low-temperature specification.
Tolerance: ±5% (CM453232-330JL) and ±10% (CM453232-330KL) vs. ±10% (primary part).

Parameter Comparison

Parameter	1812-333K (API Delevan)	CM453232-330JL (Bourns)	CM453232-330KL (Bourns)
Inductance	33 µH	33 µH	33 µH
Tolerance	±10%	±5%	±10%
Current Rating (mA)	224	160	160
DC Resistance (Max)	4 Ohm	4 Ohm	4 Ohm
Q @ Frequency	50 @ 2.5 MHz	50 @ 2.52 MHz	50 @ 2.52 MHz
Self Resonant Frequency	11 MHz	11 MHz	11 MHz
Operating Temperature	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)
Shielding	Unshielded	Unshielded	Unshielded
Product Status	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Part - 1812-333K (API Delevan Inc.): The primary part is in active production status. Selection of this component is appropriate when the 224 mA current rating is required and the broader operating temperature range (-55°C to 125°C) is specified. Note that this part is RoHS non-compliant.

Substitute Parts - CM453232-330JL and CM453232-330KL (Bourns Inc.): Both Bourns substitutes are ROHS3 compliant, providing an advantage for regulated environments requiring RoHS compliance. Both substitutes are suitable for applications where the operating temperature range can accommodate the -40°C lower limit and where the circuit current requirement does not exceed 160 mA. The inductance, DC resistance, and self-resonant frequency match the primary part exactly.

CM453232-330KL offers higher inventory availability (25,400 pieces) compared to CM453232-330JL (4,601 pieces) and matches the primary part's ±10% inductance tolerance specification.

Selection between substitutes requires verification that the reduced current rating (160 mA vs. 224 mA) and narrower low-temperature specification (-40°C vs. -55°C) are compatible with circuit design parameters.

Frequently Asked Questions (FAQ)

Q: Can the substitute parts be used in place of the 1812-333K without any circuit modifications?

A: The substitute parts match the inductance, DC resistance, frequency characteristics, and physical package dimensions of the primary part. Compatibility depends on whether your circuit current requirement exceeds 160 mA and whether operation below -40°C is necessary. If both conditions are met by the substitute specifications, no circuit modifications are required.

Q: What is the key difference between CM453232-330JL and CM453232-330KL?

A: Both parts are electrically and mechanically identical. The primary differences are inductance tolerance (±5% for JL vs. ±10% for KL) and inventory availability (4,601 pieces for JL vs. 25,400 pieces for KL). CM453232-330KL also matches the primary part's ±10% tolerance specification.

Q: Are there any compliance differences between the primary part and the substitutes?

A: The substitute parts (CM453232-330JL and CM453232-330KL) are ROHS3 compliant, while the primary part (1812-333K) is RoHS non-compliant. All parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: Does the 160 mA rating of the substitute parts limit their use?

A: The substitute parts are rated at 160 mA maximum current. If your circuit requires the full 224 mA capability of the primary part, the substitutes cannot be used. If your circuit design operates at or below 160 mA, the substitutes are fully compatible.

Q: What is the impact of the different operating temperature ranges?

A: The primary part operates from -55°C to 125°C, while the substitute parts operate from -40°C to 125°C. If your application requires operation at temperatures below -40°C, only the primary part meets this requirement. For applications limited to -40°C or above, the substitutes are fully compatible.

Q: Are the physical dimensions identical?

A: Yes. All three parts use the 1812 (4532 Metric) package with identical dimensions: 0.177" L × 0.126" W (4.50 mm × 3.20 mm) and a maximum seated height of 0.134" (3.40 mm). Direct physical substitution is possible without any PCB layout modifications.

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