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0402CT Low Profile Chip Inductors
XAL7050 High-inductance Shielded Power Inductors
XGL4020 Ultra-low DCR Power Inductors


Bias Injection Choke

RoHS compliant AEC-Q flag
Coilcraft's KA4909-AL bias injection choke was developed for use with Texas Instruments DS90UB901Q serializer and DS90UB902Q deserializer for Low-Voltage Differential Signaling (LVDS) applications. It provides more than 1 kOhm of impedance from 1 MHz – 800 MHz.
  • Provides over 1 kOhm impedance from 1 MHz – 800 MHz.
  • Developed for use with Texas Instruments DS90UB901Q serializer and DS90UB902Q deserializer for Low-Voltage Differential Signaling (LVDS) applications.
  • Can be used with additional 10 µH and 1 µH inductors to achieve even wider band differential signal rejection.
  • AEC-Q200 Grade 3 (−40°C to +85°C)
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Electrical specifications at 25°C.

Part number 1 Inductance (µH) 2
(Tolerance: ±25%)
DCR max (Ω) 3 Irms (mA) 4
KA4909-AL_ 169 0.46 650
  1. When ordering, please specify packaging codes: e.g. KA4909-ALC
  2. Inductance measured from pin 1 to 3 at 100 kHz, 0.007 Vrms, 0 Adc
  3. DCR measured from pin 1 to 3 at 25°C. For other operating temperatures, use this DCR at Temperature calculator
  4. Irms: Current that causes 20°C temperature rise from 25°C ambient. Details


  • RoHS compliant tin-silver-copper over tin over nickel over phos bronze.


  • C = 7" machine-ready reel
    EIA-481 embossed plastic tape (250 parts per full reel).
  • B = Less than full reel
    In tape but not machine-ready. To have a leader and trailer added ($25 charge), use code letter C instead.
  • 13" reel, machine-ready
    EIA-481 embossed plastic tape. Factory order only, not stocked (1000 parts per full reel).
RoHS compliant
Ambient temperature range:
−40°C to +105°C
Storage temperature range:
Component: −40°C to +105°C
Tape and reel packaging: −40°C to +80°C
Failures in Time (FIT) / Mean Time Between Failures (MTBF):

Performance curves

Z vs Frequency

Physical characteristics


Tape and Reel specification

Parts per reel Reel dimensions (mm) Tape dimensions (mm) Orientation
7" (178 mm) 13" (300mm) A B C D E W P Po P1 H T part_or_c.gif
250 1000* 178/330 60/100 13 24,4 16,4 16 12 4 2 5.0 0,35

General specification

Core Material:
220 mg
250/7″reel; 1000/13″ reel Plastic tape: 16 mm wide, 0.35 mm thick, 12 mm pocket spacing, 5.0 mm pocket depth


Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
Refer to Soldering Coilcraft Components before soldering.
PCB Washing:
Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. Other solvents.