ADG5421F

RECOMMENDED FOR NEW DESIGNS

±60 V Fault Protection and Detection, 11 Ω RON, Dual SPST Switch

Analog Devices ADG5421F Product Info

10 February 2026 8

Features

Overvoltage fault protection up to ±60 V on S1 and S2 pins
Power-off protection up to ±60 V on S1 and S2 pins
Known state without digital inputs present
Low on resistance of 11 Ω typical
Ultraflat, on resistance

Latch-up immune under any circumstance
3.5 kV human body model (HBM) ESD rating
V_SS to V_DD −2 V signal range

Fully specified at ±15 V, ±20 V, +12 V, and +36 V
±5 V to ±22 V dual-supply operation
8 V to 44 V single-supply operation

10-lead, 3 mm × 2 mm, LFCSP

Part details & applications

The ADG5421F is a dual SPST, low on resistance switch that features overvoltage protection, power-off protection, and overvoltage detection on the source pins.

When no power supplies are present, the switch remains in the off condition, and the switch inputs are high impedance. When powered, if the analog input signal levels on either of the Sx pins exceed V_DD or V_SS by the threshold voltage, V_T, both switches turn off together, and the open-drain fault flag (FF) pin pulls to a logic low. Input signal levels up to +60 V or −60 V relative to ground are blocked in both the powered and unpowered condition.

The switches turn on with a Logic 1 input and conduct equally well in both directions. The digital input is compatible with 1.8 V logic inputs over the full operating supply range.

APPLICATIONS

Analog input and output modules
Process control and distributed control systems
Data acquisition
Instrumentation
Avionics
Automatic test equipment
Communication systems
Relay replacement

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