In an inductor's datasheet:

typ inductor

Usually "Typ." stands for typical.
But I have a hard time understanding, for example the first row (1uH unductor), since its SRF frequency is 7.96MHz, what could the Typical 100MHz frequency used for/ referred to?

I would expect the typical frequency to mean the "maximum frequency to operate the inductor to, so you wont surpass the SRF", in the case of 1uH here, I would except the typical frequency to be less than 7.96MHz, something close to 6MHz.

I observe the Typ. frequency gets reduced as the inductance increases, but I cannot understand how Typ. frequency value helps me, the engineer in the use/design/implementation of the inductor.

  • 3
    \$\begingroup\$ My guess is, its a bad-written datasheet. If one looks as this datasheet, it doesn't mention "Typ. MHz", it says "SRF, Test" frequencies. \$\endgroup\$ Commented Jan 3 at 9:55
  • 5
    \$\begingroup\$ Haha, they swapped the column labels. Go figure. \$\endgroup\$ Commented Jan 3 at 10:41
  • 3
    \$\begingroup\$ Contacting Bourns to have them correct the datasheet would probably be a good thing here. \$\endgroup\$
    – user4574
    Commented Jan 3 at 18:36
  • \$\begingroup\$ @user4574 Yeah I contacted them using their online contact form. \$\endgroup\$ Commented Jan 5 at 13:50

1 Answer 1


They have got the columns mixed up.

If you look on their website, for the 1 μH part, it has an SRF of 100 MHz and 7.96 MHz is the test frequency for measuring Q-factor: -

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