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AIR CORE INDUCTORS

Document ST107-2 Revised 10/24/11

ST439RAT/ST470RATAirCoreInductors

Typical Current Derating

L vs Frequency – ST439RAT

L vs Frequency – ST470RAT

Q vs Frequency – ST439RAT

Q vs Frequency – ST470RAT

25

20

15

10

5

0

60

55

50

45

40

35

30

25

20

15

10

100

100

200

200

400

400

600

600

1000

1000

Frequency (MHz)

Frequency (MHz)

17.5 nH

22.0 nH

28.0 nH

35.5 nH

43.0 nH

2.5 nH

5.0 nH

8.0 nH

12.5 nH

18.5 nH

220

210

200

190

180

170

160

150

140

130

135

130

125

120

115

110

105

100

95

90

100

100

200

200

400

400

600

600

1000

1000

Frequency (MHz)

Frequency (MHz)

28.0 nH

35.5 nH

43.0 nH

22.0 nH

17.5 nH

18.5 nH

12.5 nH

8.0 nH

5.0 nH

2.5 nH

-40

-55

-20

020406080

100

160

140

120

Ambient temperature (°C)

120

110

100

90

80

70

60

50

40

30

20

10

0