Chip Inductor Qualification Standards
All tests are performed in accordance with AEC-Q200-REV C.
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General
Operating temperature range
- Specification
- Ceramic core: -40°C to +125°C.
- Ferrite core: -40°C to +85°C.
XXXXTC, XXXXRV series: -40°C to +125°C.
Coefficient of
expansion (TCE)
- Specification
- 6.7ppm/°C (typical).
Insulation resistance
- Specification
- 1000 megohms minimum.
- Test method/condition
- 100 Vdc between inductor terminals and center case.
Dielectric withstanding voltage
- Specification
- No evidence of voltage breakdown.
- Test method/condition
- 500 Vac between inductor terminals and center of case for a maximum
of 1 minute.
Environment/Life
Temperature coefficient of
inductance (TCL)
- Specification
- Ceramic core
(series ending in CS, HS, HQ,
HT and CT):
+25 to +125 ppm/°C typical over operating temperature and frequency range
specified in product table.
- Test method/condition
- Inductors shall be placed in an LC oscillator
circuit. The inductor will be the only portion of the circuit in the
environment chamber. The change in L will be indicated by the change in f
and calculated using the following equation.
 - Specification
-
Ferrite core
(series ending in AF, LS, RV and TC)
-
0402 size:
+25 to +150 ppm/°C typical over operating temperature range, from DC to
SRF.
0603 size:
+50 to +150 ppm/°C typical over operating temperature range, from DC to
SRF.
0805 size:
+100 to +250 ppm/°C typical over operating temperature range, from DC to
SRF.
1008 size:
+100 to +350 ppm/°C typical over operating temperature range, from DC to
SRF.
1812 size:
+200 to +700 ppm/°C typical over operating temperature range, from DC to
SRF.
4308 size:
+200 to +700 ppm/°C typical over operating temperature range, from DC to
SRF.
4312 size:
+300 to +1100 ppm/°C typical over operating temperature range, from DC
to SRF.
4513 size:
+50 to +210 ppm/°C typical over operating temperature range, from DC
to SRF.
5315 size:
+300 to +1100 ppm/°C typical over operating temperature range, from DC
to SRF.
- Test method/condition (except series ending in
LS)
- TCL is measured directly using an Agilent/HP 4263
LCR meter.
- Test method/condition
(series ending in LS)
- Inductors shall be placed in an LC oscillator
circuit. The inductor will be the only portion of the circuit in the
environment chamber. The change in L will be indicated by the change in f
and calculated using the following equation.
Static humidity
- Specification
- Inductance must not change more than the stated
tolerance.
- Test method/condition
- Inductors shall be subjected to 85°C, 85% relative
humidity for
1000 hours. Inductors are to be tested after being air dried for one day.
Thermal shock
- Specification
- There shall be no case deformation or change in
dimensions.
- Inductance must not change more than the stated
tolerance.
- Test method/condition
- Inductors shall be subjected 300 times to the following temperature cycle: -40°C for 15 minutes to maximum operating temperature for 15 minutes; transition time less than 20 seconds.
Inductors are to be tested after one day at room temperature.
Thermal cycling
- Specification
- There shall be no case deformation or change in
dimensions.
- Inductance must not change more than the stated
tolerance.
- Test method/condition
- Inductors shall be subjected 1000 times to the following temperature cycle: -40°C for 15 minutes to maximum operating temperature for 15 minutes; transition time 10 minutes. Inductors are to be tested after one day at room temperature.
Low temperature storage
- Specification
- There shall be no case deformation or change in
dimensions.
- Inductance shall not change more than ±5%.
- Test method/condition
- Inductors shall be subjected to -55°C ±2°C for 1000 hours.
- Inductors are to be tested after one day at room temperature.
High temperature load life
- Specification
- Inductors must not have a shorted or open winding.
- Test method/condition
- Inductors shall be stored at maximum operating temperature for 1000 hours with rated current applied. Inductor shall be tested at start of test and at 1000 hours. Inductors are to be tested after one day at room temperature.
Board flex
- Specification
- There must be no case deformation or open circuit during test.
- Test method/condition
- Inductors shall be mounted to PC board. Apply force to center of PC board to flex 2 mm min.
Moisture resistance
- Specification
- Inductors must not have a shorted or open winding.
- Test method/condition
- Inductors shall be subjected to ten 24-hour cycles at 25°C to 65°C at 80 to 95%
relative humidity, per MIL-STD202 Method 106. Inductors
are to be tested after one day at room temperature.
Other
Solderability
- Specification
- The metalized area must have 90% minimum solder coverage.
- Test method/condition
- Dip pads in flux (Alpha 100 or equivalent) and dip in solder pot (63 Sn/37 Pb or 96.5 Sn/3.0 Ag/0.5 Cu solder) at 232°C ±5°C. For parts less than or equal to 0.195" (4.95 mm) in length or width, dip for 5 seconds. For
parts greater than 0.195" (4.95 mm) in length or width, dip for 20 seconds.
Resistance to soldering heat
- Specification
- There must be no case deformation or change in
dimensions.
-
Inductance shall not change more than the stated
tolerance.
- Test method/condition
-
Test per MIL-STD-202 Method 210 Condition B. Inductors
shall be reflowed three times onto a PC board using 96.5 Sn/3.0 Ag/0.5 Cu or 63 Sn/37 Pb
solder paste. Allow 24 hours between reflows.
-
For 96.5 Sn/3.0 Ag/0.5 Cu solder paste: >217°C for 90
seconds.
Solder process shall be at a maximum temperature of 260°C.
-
For 63 Sn/37 Pb solder
paste: >183°C for 120 seconds.
Solder process shall be at a maximum temperature of 235°C.
Vibration
- Specification
- There must be no case deformation or change in
dimensions.
- Inductance shall not change more than stated
tolerance.
- Test method/condition
- Inductors shall be vibrated for 20 minutes at 5 G from 10 Hz to 2000 Hz per MIL-STD 202 Method 204.
Mechanical shock
- Specification
- There must be no case deformation or change in
dimensions.
- Inductance shall not change more than stated
tolerance.
- Test method/condition
- Test per MIL-STD 202 method 213 test condition C. Test mounted samples in three axes, six times, totaling 18 shocks (100 G, 6 ms, half-sine).
Component adhesion (push test)
- Specification
- 0201 Series — 115 g
0302 Series — 295 g
0402 Series — 450 g
0403 Series — 450 g
0603 Series — 900 g
0604 Series — 900 g
0805 Series and larger — 1.8 kg
- Test method/condition
- Inductors shall be reflow soldered (262°C ±5°C for
10 seconds) to a tinned copper substrate. A force gauge shall be applied
to the side of the component. The device must withstand the stated force
without a failure of the termination to component attachment.
Resistance to solvent
- Specification
- There must be no case deformation, change in
dimensions, or
obliteration of marking.
- Test method/condition
- Inductors must withstand 6 minutes of alcohol.
Flammability
- Specification
- IEC 60695-2-2
- Test method/condition
- Inductors must withstand needle-flame test.
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