ADG465

Features:

Signal Paths Open Circuit with Power Off
Signal Path Resistance of RON with Power On
44 V Supply Maximum Ratings
1 nA Max Path Current Leakage @ +258
Latchup-Proof Construction




Application

ATE Equipment
Sensitive Measurement Equipment
Hot-Insertion Rack Systems
ADC Input Channel Protection




Pinout








Specifications

V_DD to V_SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+44 V
V_S, V_D, Analog Input Overvoltage with Power ON²
. . . . . . . . . . . . . . . . . . . . . . . . . V_SS 20 V to V_DD + 20 V
V_S, V_D, Analog Input Overvoltage with Power OFF²
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 V to +35 V
Continuous Current, S or D . . . . . . . . . . . . . . . . . ..20 mA
Peak Current, S or D . . . . . . . . . . . . . . . . . . . . . . . .40 mA
(Pulsed at 1 ms, 10% Duty Cycle Max)
Operating Temperature Range
Industrial (B Version) . . . . . . . . . . . . . . .40°C to +85°C
Storage Temperature Range . . . . . . . . 65°C to +125°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . +150°C
SOT-23 Package
_JA, Thermal Impedance . . . . . . . . . . . . . . . . . .230°C/W
µSOIC Package
_JA, Thermal Impedance . . . . . . . . . . . . . . . . . .205°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . .+215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . +220°C






Description

The ADG465 is a single channel protector in an SOT-23 pack-age. The channel protector is placed in series with the signal path, and will protect sensitive components from voltage transience in the signal path whether or not the power supplies are present. Because the channel protection works regardless of the presence of the supplies, the channel protectors are ideal for use in applications where correct power sequencing cannot always be guaranteed to protect analog inputs (e.g., hot-insertion rack systems). ADG465 is discussed further, and some example circuits are given, in the Applications section of this data sheet.

ADG465 channel protector consists of an n-channel MOSFET, a p-channel MOSFET and an n-channel MOSFET, connected in series. The channel protector behaves like a series resistor during normal operation, i.e., (V_SS + 2 V) < V_IN < (V_DD 1.5 V). When a channel's analog input exceeds the power supplies (including VDD and VSS = 0 V), one of the MOSFETs will switch off, clamping the output to either VSS + 2 V or VDD 1.5 V. Circuitry and signal source protection is provided in the event of an overvoltage or power loss. The channel protectors can withstand overvoltage inputs from 40 V to +40 V. See the Circuit Information section of this data sheet.