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Murata Electronics LQH43MN122K03L — Inductors & Chokes

Murata LQH43MN122K03L Drum Core Inductor, 1.2 mH, 45 mA

MPNLQH43MN122K03L
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Murata Electronics LQH43 series drum core wirewound inductor, unshielded, 1.2 mH ±10%, 45 mA rated current, 30 Ohm DCR, 1812 (4532 Metric) SMD package.

$0.2225Ref. price · indicative, final on quote
Murata Electronics LQH43MN122K03L datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LQH43MN122K03L specifications
ParameterValue
TypeDrum Core, Wirewound
SeriesLQH43
MountingSurface Mount
Current rating45 mA
Frequency - self resonant1.8MHz
Inductance frequency - test1 kHz
Operating temperature-40°C ~ 85°C
Material - coreFerrite
Size (Dimension)0.177\" L x 0.126\" W (4.50mm x 3.20mm)
Height - seated0.110\" (2.80mm)
PackageTape & Reel (TR)
Q @ freq40 @ 252kHz
ShieldingUnshielded
Tolerance±10%
Inductance1.2 mH
Case1812 (4532 Metric)
DC resistance30Ohm Max

Product details

1.2 mH drum core for bias and filtering

The Murata LQH43MN122K03L is a wirewound drum core inductor in the LQH43 series, delivering 1.2 mH inductance in an unshielded 1812 (4532 Metric) surface-mount package. Rated for 45 mA continuous current with a maximum DC resistance of 30 Ohm, this part is sized for low-power bias lines, filter chokes, and decoupling networks where the inductance dominates over current handling. The self-resonant frequency of 1.8 MHz sets the usable band ceiling — above that the inductor behaves capacitively, so keep the operating frequency below 1.8 MHz for inductive response. A Q factor of 40 at 252 kHz indicates moderate efficiency at low frequencies, typical for a ferrite-core drum coil at this inductance value.

Footprint and temperature envelope

Inductance is tested at 1 kHz, which is the standard low-frequency reference for power inductors — the actual inductance at the operating frequency will differ due to core permeability roll-off.

Frequently asked questions

What is the inductance tolerance of LQH43MN122K03L?

The inductance tolerance is ±10% at 1.2 mH.

Is LQH43MN122K03L shielded or unshielded?

It is an unshielded drum core design — the magnetic field radiates from the coil, so adjacent traces or components on the same layer may couple noise. Keep sensitive routing at least one component height away.

What is the DC resistance of LQH43MN122K03L?

Maximum DC resistance is 30 Ohm, which at 45 mA produces a 60 mW I²R loss — negligible for most bias circuits but worth checking against the thermal budget in a dense layout.