LAL04KB151K Equivalent & Substitute Parts

Part Overview

The LAL04KB151K is a 150 µH unshielded axial inductor manufactured by Taiyo Yuden, rated for 175 mA maximum current with a DC resistance of 4.2 Ohm maximum. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part operates across a temperature range of -25°C to 105°C and is suitable for through-hole mounting applications requiring fixed inductance values in the 150 µH range.

Substiute Parts

LAL04KB151K

Taiyo YudenIn Stock: 1101LAL04KB151K Datasheet

Current PartRFQ

8230-72-RC

Bourns Inc.In Stock: 12998230-72-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LAL04KB151K is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 150 µH (with ±10% tolerance allowance)
• Inductance tolerance: ±10%
• Mounting type: Through hole
• Package configuration: Axial

Secondary Compatibility Factors:

• Current rating: Substitute must support minimum 175 mA operation
• DC resistance: Substitute DCR must not exceed application thermal and power dissipation limits
• Shielding classification: Unshielded configuration
• Operating temperature range: Substitute must cover or exceed -25°C ~ 105°C

The substitute part 8230-72-RC from Bourns Inc. matches the primary inductance and package requirements. However, the current rating (85 mA) and DC resistance (15 Ohm maximum) differ from the main part specifications and must be evaluated against specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

LAL04KB151K (Taiyo Yuden): The main part is classified as obsolete. Current inventory of 1018 pieces is available; however, long-term procurement is not assured. This part carries REACH Unaffected status and EAR99 classification.

8230-72-RC (Bourns Inc.): This substitute is classified as active product status, ensuring ongoing availability and supply chain continuity. The part is RoHS3 compliant and carries REACH Unaffected status with EAR99 classification. The extended operating temperature range (-55°C ~ 105°C) provides broader environmental coverage than the main part.

Critical Differences Requiring Circuit Evaluation: The 8230-72-RC exhibits a current rating of 85 mA, which is 51% lower than the LAL04KB151K rating of 175 mA. The DC resistance of 15 Ohm maximum is 3.6 times higher than the main part's 4.2 Ohm maximum. These differences directly impact power dissipation and thermal performance in the application circuit. The self-resonant frequency of 11 MHz for the substitute is higher than the main part's 3.5 MHz, affecting high-frequency behavior.

Selection of the 8230-72-RC is appropriate only when circuit current requirements do not exceed 85 mA and when the increased DC resistance and associated power dissipation are acceptable within the thermal design constraints.

Frequently Asked Questions (FAQ)

Q: Can the 8230-72-RC directly replace the LAL04KB151K in all applications?

A: No. While both components share identical inductance values (150 µH) and package configurations (axial through-hole), the 8230-72-RC has a maximum current rating of 85 mA compared to the LAL04KB151K's 175 mA rating. Applications requiring currents above 85 mA cannot use the substitute without risking inductor saturation and performance degradation.

Q: What is the impact of the higher DC resistance in the 8230-72-RC?

A: The 8230-72-RC exhibits 15 Ohm maximum DC resistance versus 4.2 Ohm maximum for the LAL04KB151K. This 3.6-fold increase results in higher power dissipation (I²R losses) at equivalent current levels. For a 100 mA current, the 8230-72-RC dissipates approximately 0.15 W compared to 0.042 W for the main part. Thermal management and circuit efficiency must be re-evaluated when substituting.

Q: Are there temperature range differences between these parts?

A: Yes. The LAL04KB151K operates from -25°C to 105°C, while the 8230-72-RC operates from -55°C to 105°C. The substitute provides extended low-temperature capability, making it suitable for applications requiring operation below -25°C. Both parts support the upper temperature limit of 105°C.

Q: What is the significance of the different self-resonant frequencies?

A: The LAL04KB151K has a self-resonant frequency of 3.5 MHz, while the 8230-72-RC is rated at 11 MHz. The higher self-resonant frequency of the substitute indicates different parasitic capacitance characteristics. At frequencies approaching or exceeding the self-resonant point, inductor behavior transitions from inductive to capacitive. Applications operating near 3.5 MHz may experience different frequency response with the substitute.

Q: What is the difference in Q factor between these inductors?

A: The LAL04KB151K exhibits a Q factor of 45 at 796 kHz, while the 8230-72-RC has a Q factor of 30 at 790 kHz. The higher Q factor of the main part indicates lower losses at the test frequency. For applications sensitive to inductor losses and efficiency, this difference may be significant.

Q: Are both parts RoHS compliant?

A: The LAL04KB151K does not specify RoHS status in the provided data. The 8230-72-RC is explicitly RoHS3 compliant. For applications requiring RoHS compliance certification, the 8230-72-RC is the appropriate selection.

Q: What are the physical size differences?

A: The LAL04KB151K measures 0.157" diameter × 0.386" length (4.00 mm × 9.80 mm). The 8230-72-RC measures 0.120" diameter × 0.300" length (3.05 mm × 7.62 mm). The substitute is physically smaller in both dimensions, which may affect PCB layout and mechanical clearance considerations.

Q: Can I use the 8230-72-RC in a circuit designed for the LAL04KB151K without modifications?

A: Substitution requires circuit-level evaluation. The reduced current rating and increased DC resistance necessitate verification that the application current does not exceed 85 mA and that increased power dissipation is acceptable. Physical size differences must also be confirmed compatible with PCB layout constraints.