JESD-201 Tin Whisker Test Results

Tin Whisker Growth Results on Tin Surface Finished Products
Rev. B, 18 November 2014
Whisker growth test methods and conditions per JESD-201 and JEDEC22a121.01.
In case of deviation between the two methods, JESD-201 was used.
Definitions per JESD-201 and JEDEC22a121.01
Whisker Class Level
Class 3: Mission / Life critical applications such as military, aerospace and medical applications.
Pure tin and high tin content alloys are not typically acceptable.
Class 2: Business critical aplications such as Telecom Infrastructure equipment, High-end Servers, Automotive, etc.
(long product lifetimes).
Class 1: Industrial / consumer products (medium product lifetimes).
Class 1A: Consumer products (short product lifetimes).
Maximum Whisker Density Range
Low: < 10 whiskers per (mm2)
Medium: 10 - 45 whiskers per (mm2)
High: > 45 whiskers per (mm2)
Whisker Definition
Spontaneous columnar or cylindrical
filament emanating from the surface
Length ≥ 10μm.
Aspect ratio (l/w) > 2.
Configuration
Applicable Products
Rectangular / Square
5 Side Termination
Preconditioning Exposure
A: No preconditioning
C: SnPb reflow conditions, 220°C peak
D: Pb-free reflow conditions, 260°C peak
Inward Formed L-Shaped Leadframe
Ceramic Two Lead
Radial Configuration
Ceramic Chips
Aluminum (AO-CAP),
Conductive Polymer
(KO CAP),
Tantalum MnO2 Chips
Conductive Polymer
(KO CAP),
Tantalum MnO2 Chips
C3xx, C6xx, C052 and C062
Ceramic Through-Hole
Product Series
C
100% Matte Tin
100 - 400 μ-inch
Nickel
50 μ-inch min.
18
3.4 mm2
SEM / 3000X
A
C
D
0
0
0
n/a
n/a
n/a
2
2
2
Low
Low
Low
0
3
4
n/a
26μm 20μm
2
2
2
Low
Low
Low
0
>45
0
n/a
43μm
n/a
2
2
2
Low
High
Low
T
100% Matte Tin
160 - 320 μ-inch
Nickel
30 - 80 μ-inch
18
3.6 mm2
SEM / 3000X
A
C
D
0
0
0
n/a
n/a
n/a
2
2
2
Low
Low
Low
0
1
5
n/a
34
22μm
2
2
2
Low
Low
Low
0
0
0
n/a
n/a
n/a
2
2
2
Low
Low
Low
T
100% Matte Tin
160 - 320 μ-inch
Copper
80 - 120 μ-inch
18
3.6 mm2
SEM / 3000X
A
C
D
0
0
0
n/a
n/a
n/a
2
2
2
Low
Low
Low
0
11
6
n/a
35
34μm
2
2
2
Low
Low
Low
0
0
0
n/a
n/a
n/a
2
2
2
Low
Low
Low
C or T
100% Matte Tin
160 - 480 μ-inch
Nickel
50 μ-inch min.
18
20.4 mm2
SEM / 3000X
A
C
D
0
0
0
n/a
n/a
n/a
2
2
2
Low
Low
Low
0
2
4
n/a
25μm
20μm
2
2
2
Low
Low
Low
0
6
0
n/a
30μm
n/a
2
2
2
Low
Low
Low
Example
Exposure
Temperature / Humidity Storage
30°C, 60% RH, 4000 hours
High Temp / Humidity Storage
55°C and 85% RH, 4000 hours
Temperature Cycling
-55°C to +85°C, 1000 cycles
Termination Code
Termination Finish
Finish Thickness
Barrier Plating
Barrier Thickness
Terminals Inspected
Inspection Area per Terminal
Inspection Equipment / Mag
Preconditioning
Whisker Count
Longest Whisker
Meets Class Level
Whisker Density Range
Whisker Count
Longest Whisker
Meets Class Level
Whisker Density Range
Whisker Count
Longest Whisker
Meets Class Level
Whisker Density Range