Site Settings

Language settings
Currency settings
Video Library
Cx Family Common Mode Chokes
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)

Buy Now:

The part number you have selected is not available through our online store.

Please click the "Request Quote" button for pricing and more information.

. in stock, ready to ship today.
Request a Sample:


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. Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
  • D = 13″ machine ready reel. EIA-481 embossed plastic tape. Factory order only, not stocked (1000 parts per full reel).
  • B = Less than full reel. In an effort to simplify our part numbering system, Coilcraft is eliminating the need for multiple packaging codes. When ordering, simply change the last letter of your part number from B to C.
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.