The ADG466 and ADG467 from Analog Devices are triple and octal channel protectors, respectively, that protect sensitive components from voltage transients in the signal path regardless of the presence or absence of the power supplies. Since the channel protection works regardless of whether the supplies are present, the channel protectors are ideal for use in applications where correct power sequencing cannot always be guaranteed (e.g., hot-insertion rack systems) to protect analog inputs. This is discussed further, and some example circuits are given in the Applications section of this data sheet.
The ADG466 (triple) and ADG467 (octal) channel protectors are placed in series with signal paths to guard sensitive components from voltage transients. They operate as low‑resistance series elements during normal conditions and clamp the output when an over‑voltage occurs, even if power supplies are absent.
Typical applications include ATE equipment, sensitive measurement systems, and hot‑insertion rack modules where power sequencing cannot be guaranteed. The devices feature trench‑isolated MOSFETs for latch‑up proof operation and can be combined with TVS devices for higher‑voltage surge protection.
| Fault‑Free Analog Signal Range | Vss +1.2 V to Vpp ‑0.8 V |
|---|---|
| On‑Resistance (Ron) typical | ADG466 60 Ω typ, ADG467 75 Ω typ |
| Channel Output Leakage (typ) | ≈0.2 nA at Vp open‑circuit |
| Supply Current (Ipp) typ | ≈0.05 µA typ |
| Package Options | ADG466: 8‑lead DIP, SOIC, pSOIC; ADG467: 18‑lead SOIC, 20‑lead SSOP |
They can withstand continuous voltage inputs from –40 V to +40 V.
Typical on‑resistance is about 60 Ω for ADG466 and 75 Ω for ADG467.
ADG466 is offered in 8‑lead DIP, SOIC and pSOIC packages; ADG467 is offered in 18‑lead SOIC and 20‑lead SSOP packages.