ADG467BRSZ-REEL Analog Devices Inc, ADG467BRSZ-REEL Datasheet - Page 13

• Manufacturer Part Number: ADG467BRSZ-REEL
• Description: Octal Channel Protector I.C.
• Manufacturer: Analog Devices Inc
• Series: ADG467r

Specifications of ADG467BRSZ-REEL

• Voltage - Clamping: ±40V
• Technology: Mixed Technology
• Number Of Circuits: 8
• Applications: General Purpose
• Package / Case: 20-SSOP
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Voltage - Working: -
• Lead Free Status / Rohs Status: Compliant

HIGH VOLTAGE SURGE SUPPRESSION
The ADG467 is not intended for use in high voltage applications
like surge suppression. The ADG467 has breakdown voltages in
excess of V
power supplies are connected. When the power supplies are
disconnected, the breakdown voltages on the input of the
channel protector are ±40 V. In applications where inputs are
likely to be subject to overvoltages exceeding the breakdown
voltages specified for the channel protectors, transient voltage
suppressors (TVSs) should be used. These devices are
commonly used to protect vulnerable circuits from electric
overstress such as that caused by electrostatic discharge,
inductive load switching, and induced lightning. However,
TVSs can have a substantial standby (leakage) current (300 μA
typical) at the reverse standoff voltage. The reverse stand-off
SS
− 20 V and V
DD
+ 20 V on the inputs when the
Figure 28. High Voltage Protection
Rev. B | Page 13 of 16
V
V
V
V
V
V
V
V
V
DD
D1
D2
D3
D4
D5
D6
D7
D8
= +5V
ADG467
TVSs BREAKDOWN
VOLTAGE = 20V
V
SS
voltage of a TVS is the normal peak operating voltage of the
circuit. Also, a TVS offers no protection against latch-up of
sensitive CMOS devices when the power supplies are off. The
ideal solution is to use a channel protector in conjunction with
a TVS to provide the optimal leakage current specification and
circuit protection.
Figure 28 shows an input protection scheme that uses both a
TVS and a channel protector. The TVS is selected with a reverse
standoff voltage that is much greater than the operating voltage
of the circuit (TVSs with higher breakdown voltages tend to
have better standby leakage current specifications) but is inside
the breakdown voltage of the channel protector. This circuit
protects the circuitry regardless of whether the power supplies
are present.
= –5V
V
V
V
V
V
V
V
V
S1
S2
S3
S4
S5
S6
S7
S8
ADC
ADG467