ESD protection for transmission interfaces
Super speed transmission interfaces have specific requirements regarding signal loss and spatial constraints, necessitating components with low capacitance and compact size.
1.Use low-capacitance components to maintain signal integrity.
2.Ensure IEC 61000-4-2 compliance (≥8 kV contact discharge).
3.Lower clamping voltage offers better protection.
4.Meet signal quality requirements in insertion loss and eye diagram tests.
Frequency and capacitance estimation formula:
1.Higher signal frequency requires lower capacitance.
2.To maintain signal integrity at high frequencies, ESD protection components must have ultra-low capacitance.
3.As frequency increases, the acceptable capacitance decreases to avoid signal distortion, insertion loss, and eye diagram degradation.
4.Typical design rule: the cutoff frequency of the RC filter formed by the ESD component should exceed the signal frequency by at least 2–3×.
Comchip offers the CPDWZ5V0SBP-HF series with lower clamping voltage and reduced capacitance, optimized for various transmission interfaces. These components demonstrate excellent performance in both eye diagram analysis and S21 insertion loss testing. The ultra-low capacitance model, CPDWZ5V0P-HF, features a capacitance as low as 0.08 pF.
Part Number
Status
AEC-Q
Uni/Bi
PPP(W)
VRWM(V)
Vc(V)
IPP(A)
Cj(pF)
ESD(kV)
Package
Active
-
Bi
40
5
20
2
0.08
15
CSP0603-2L
Active
-
Bi
20
5
8
2.5
0.15
10
CSP0603-2L
Active
-
Bi
30
5
14
2
0.2
15
0201/DFN0603
Active
-
Bi
14
3.3
3.5
4
0.25
12
CSP0603-2L
Active
-
Bi
72
1.5
8
9
0.26
20
CSP0603-2L
Active
-
Bi
62
5
8.8
7
0.26
15
CSP0603-2L
Active
-
Bi
40
5
8
5
0.29
18
CSP0603-2L
Active
-
Bi
27
5
3.8
7
0.4
26
CSP0603-2L
Active
-
Bi
34
3.3
4.5
7.5
0.45
22
CSP0603-2L
Active
-
Bi
42
5
7
6
0.45
12
CSP0603-2L
Active
-
Bi
75
5
9
10
0.48
16
CSP0603-2L
Active
-
Bi
15
5
5
3
0.5
17
0201/DFN0603-2L
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