SM8S24AHE3/2D Vishay, SM8S24AHE3/2D Datasheet - Page 3

• Manufacturer Part Number: SM8S24AHE3/2D
• Description: TVS 8W 24V 5% DO-218AB
• Manufacturer: Vishay

Specifications of SM8S24AHE3/2D

• Voltage - Reverse Standoff (typ): 24V
• Voltage - Breakdown: 26.7V
• Power (watts): 8W
• Polarization: Unidirectional
• Mounting Type: Surface Mount
• Package / Case: DO-218AB
• Polarity: Unidirectional
• Clamping Voltage: 38.9 V
• Operating Voltage: 24 V
• Breakdown Voltage: 26.7 V
• Peak Surge Current: 170 A
• Peak Pulse Power Dissipation: 6600 W
• Maximum Operating Temperature: + 175 C
• Minimum Operating Temperature: - 55 C
• Dimensions: 8.7(Max) mm W x 13.7(Max) mm L
• Reverse Stand-off Voltage Vrwm: 24V
• Breakdown Voltage Range: 26.7V To 29.5V
• Clamping Voltage Vc Max: 38.9V
• Diode Configuration: Unidirectional
• Peak Pulse Current Ippm: 170A
• Diode Case Style: DO-218AB
• No. Of Pins: 2
• Rohs Compliant: Yes
• Power Dissipation Pd: 8W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Some vehicle manufactures apply different conditions for
the load dump test based on ISO-7637-2 pulse 5. The peak
clamped current of the load dump TVS will be estimated by
the following equation:
Calculation for peak clamping current
I
V
V
R
Figure 6a shows the current and voltage waveforms of
Vishay’s SM5S24A in the ISO 7637-2 test of 87 V V
V
Figure 6b shows the clamped voltage and current of load
dummp TVF fail in the ISO 7637-2 test of 87 V V
V
voltage drops to near zero, and the current passed through
the device is increased to the maximum allowed by the line
impedance.
Document Number: 88490
Revision: 09-Aug-10
I
PP
PP
in
c
batt.
batt.
i
: Line impedance
: Clamping voltage
: Peak clamping current
: Input voltage
=
, 0.75 Ω R
, 0.5 Ω R
Fig. 6a - Clamped Voltage and Current of SM5A24A
(
V
in
–
V
c
i
) R
i
and 400 ms pulse width.
⁄
and 400 ms pulse width. The clamping
i
Fig. 6 - For ISO-7637-2 Test Conditions, the Standard Condition is a V
in ISO 7637-2 Test
Transient Voltage Suppressors (TVS) for
[e-mail], [e-mail],
V
V
S
For technical questions within your region, please contact one of the following:
r
V
(V)
Automotive Electronic Protection
P
100
50
0
0
and R
i
(Line Impedance) Range of 0.5 Ω to 4 Ω
S
S
, 13.5 V
, 13.5 V
100
JASO A-1
36.8 % of V
Line Impedance and Pulse Duration
JASO A-1:
ISO-7637:
P
200
Maximum clamping capability of Vishay load dump TVS of
ISO 7637-2 pulse 5 test condition with 13.5 V V
400 ms pulse width is as Figure 6c.
Fig. 6c - Maximum Clamping Capability of Vishay Load Dump TVS
Fig. 6b - Clamped Voltage and Current of Load Dump TVS
0.8 Ω, 200 ms
0.5 Ω min. (0.5 Ω to 4 Ω),
400 ms max. (40 ms to 400 ms)
[e-mail]
Vishay General Semiconductor
300
ISO 7637
V
r
+ 10 % of V
S
Failures in ISO7637-2 Test
Range of 65 V to 87 V,
(ms)
in ISO7637-2 Test
S
400
Application Note
www.vishay.com
batt.
and
3