Military EMI/RFI Filters
Filter Design Guide
High Reliability/Military Qualified Products
MIL-PRF-28861 SCREENING
Class S, Class B
Class S or Class B are specified by the customer.
The Group A sequence as outlined in MIL-PRF-28861 is
performed on a 100% basis whenever reliability codes for
Differences between Class S and Class B screening are
shown in the descriptions.
S-CLASS, B-CLASS TESTING
MIL-STD-202
(method)
Test
Description
Thermal Shock
107, cond. A
S-class: 5 cycles from -55°C to +125°C. Through hole mounting required.
B-class: as above except mounting not required.
Burn-in
108
S-class: 168 hours minimum at 2.0X rated voltage, 125°C polarity reversal
for the first 24-72 hours; fused B/I circuit for each filter.
B-class 164 4 hours at 2.0X rated voltage.
Dielectric
Withstanding Voltage
301
S-class, B-class: 2.5X rated DC voltage for 5 seconds minimum,
1 minute maximum, 50 mA charging current.
Insulation
302, cond. A
305
S-class: test at 100 VDC or rated, V, whichever is less. Pass/fail limits are
lot also based upon 125°C readings from first 50 pieces.
B-class: same as above, except omit pass/fail as per 50 piece calculation.
S-class, B-class: test at 1000 100 Hz, 0.1 to 1.2 VRMS.
Resistance
Capacitance and
Dissipation Factor
Insertion Loss
DC Resistance
Voltage Drop
Radiographic Inspection
Seal Test
Visual and Mechanical
—
303
—
209
112
—
S-class, B-class: per MIL-STD-220 at load, no-load as specified.
S-class, B-class: test is optional if DC Voltage Drop Test performed.
S-class, B-class: M28861 para 4.6.6.1 (AC rated), para 4.6.6.2 (DC rated)
S-class, B-class: 2 views required with 10X examination of images.
S-class: condition C
B-class: condition A or D
S-class: M28861 para. 4.6.1.2 which includes element, subassembly,
and pre-cap inspections.
B-class: M28861 para. 4.6.1.1 for external visual only.
S-class, B-class: 5 samples.
Solderability
208
MILITARY QUALIFIED PRODUCTS
clarify these differences we have incorporated the following
There have been many questions raised regarding the differ-
ences between MIL-PRF-15733 and MIL-PRF-28861. To
Analysis Chart which compares the differences between
these two military specifications.
ANALYSIS MIL-PRF-15733 vs. MIL-PRF-28861
MIL-PRF-15733
Characteristics
MIL-PRF-28861
Filter/Design/
Construction
Filter/Design/Construction
Class S
Class B
Case
Standard
Standard
Special Design
BR
Standard
Special Design
BX
Capacitor (Discoidal) Standard
• Dielectrics
• K
X7R, Z5U
2200-10K
N/A
2K max
2K max
• VTL
+15%, -40%
Limited Cap/Case Size
Conversion Design
+15%, -25% (when design permits)
Limited Cap/Case Size &
MIL-PRF-123 Req’ts Conversion Design
• Cap Range
Max Cap/Case Size
Testing
Testing
Group A
• Test
MIL-STD-105,
1.0% AQL
None
100% Test
10%
100% Test
• PDA
Thermal Shock, Burn-in*,
IR & DWV–2% each test Cap,
Volt. Drop, Insertion
Loss -3% max combined
Total 10% max
(parts defective
allowed)
X-Ray
Leak Test
None
MIL-STD-202 Method 209
Condition “A” Gross Leak
MIL-STD-202 Method 209
Condition “A” Gross Leak
Condition “C” Fine Leak
PDA 10% max
Condition “A” Gross Leak
PDA 10% max
Burn-In
None generally. A few slash
160 Hrs. @ 2 x rated voltage – 168 Hrs. (250 Hrs. max) @ 2 x rated voltage
sheets require 1.4 x rated voltage Resistor protected
– Fuse protected *PDA .2% max last 50 hrs.
Insertion Loss
Solderability
1.0% AQL
None
100%
100%
MIL-STD-202 Method 208
5 Samples
MIL-STD-202 Method 208
5 Samples
102
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