Analog Devices Inc. ADG467BR

Overview

ADG467BR from Analog Devices is an octal channel protector IC designed for fault-tolerant analog signal path protection in systems with uncertain power sequencing. It provides ±40 V overvoltage tolerance, 62 Ω typical on-resistance, ±1 nA max channel leakage at +25°C, and opens-circuit behavior when powered off - enabling safe hot-insertion in ATE and rack-mounted measurement systems.

For engineers reviewing the ADG467BR datasheet, ADG467BR pinout, ADG467BR application, or ADG467BR equivalent, key selection criteria include fault-clamp voltage (VDD − 1.5 V / VSS + 1.5 V), trench-isolated latch-up immunity, dual-supply operation (±4.5 V to ±20 V), and SOIC_W-18 package compatibility with industrial temperature range (−40°C to +85°C).

Technical Context

The ADG467BR implements eight independent channel protectors, each composed of two N-channel and two P-channel MOSFETs in series with trench isolation. During normal operation (VSS + 1.5 V < VSx < VDD − 1.5 V), it behaves as a low-RON series resistor; during overvoltage, one MOSFET saturates to clamp output at VDD − 1.5 V (positive fault) or VSS + 1.5 V (negative fault).

With power disconnected (VDD = VSS = 0 V), all transistors turn off, limiting input leakage to ±0.5 nA typical and blocking signal paths entirely. Its absolute maximum analog input rating is −40 V to +40 V under power-off conditions and VSS − 20 V to VDD + 20 V with supplies active.

Key Specifications

Pinout & Package

ADG467BR is packaged in an 18-lead SOIC_W (RW-18) with 0.4 mm lead pitch and JEDEC MS-013-AB compliance. The device uses a dual-sided pin layout: drain terminals (VD1–VD8) occupy pins 1–8 and 10–11; source terminals (VS1–VS8) occupy pins 17–10 (reversed order); VDD (pin 18) and VSS (pin 9) are located at opposite ends.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar channel protection applications.

Compared with ADG467BR, ADG469BRZ offers reduced fault margin and higher RON but same footprint, while MAX4677ESE+ lacks trench isolation and has lower voltage tolerance - making ADG467BR the sole option for guaranteed latch-up immunity and ±40 V power-off survivability in mission-critical ATE.

Availability

ADG467BR is available at Aetrix Electronics and suitable for automated test equipment, sensitive measurement instrumentation, and hot-insertion rack systems requiring stable component supply across extended industrial temperature ranges and long production lifecycles.

Supply support for ADG467BR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.

The ADG467BR belongs to Analog Devices' precision channel protection product line, engineered specifically for fault-resilient analog signal routing in environments where power sequencing cannot be guaranteed - such as ATE, medical instrumentation, and modular industrial controllers.

FAQ

What is the maximum continuous overvoltage the ADG467BR can withstand with power supplies disconnected?

The ADG467BR can withstand continuous analog input voltages from −40 V to +40 V when VDD and VSS are at 0 V. This is explicitly specified in the Absolute Maximum Ratings table and verified by trench-isolated MOSFET structure that blocks conduction entirely under zero-bias conditions. This capability makes ADG467BR uniquely suited for hot-swap applications where signal lines may be energized before power rails stabilize.

Does the ADG467BR require external components to function as a channel protector?

No, the ADG467BR operates as a fully self-contained channel protector with no external components required for basic fault protection. Its internal trench-isolated MOSFET array provides automatic clamping at VDD − 1.5 V or VSS + 1.5 V during overvoltage events and open-circuit behavior when powered off. External RC networks or TVS diodes are optional enhancements for extreme surge environments beyond ±40 V, but not necessary for compliance with the ADG467BR's rated specifications.

Is the ADG467BR pin-compatible with the ADG467BRS variant?

No, the ADG467BR (SOIC_W-18, RW-18) and ADG467BRS (SSOP-20, RS-20) have different pin counts, layouts, and terminal assignments. The SOIC version uses pins 1–8 for VD1–VD8 and pins 10–17 for VS8–VS1, while the SSOP version adds two NC pins and rearranges VS/VD ordering. PCB redesign is required to substitute ADG467BRS for ADG467BR; they are functionally identical but not mechanically or electrically pin-compatible.

What is the typical on-resistance flatness specification for the ADG467BR across its operating voltage range?

The ADG467BR exhibits RON flatness of 6 Ω maximum across a ±5 V input range (−5 V ≤ VSx ≤ +5 V) under ±15 V supplies. This tight flatness ensures consistent gain and offset performance in multi-channel analog multiplexers or calibrated sensor arrays. Measured flatness degrades outside this range - e.g., rising to ~15 Ω at ±10 V input - as confirmed in Figure 5 of the Rev. B datasheet.

Can the ADG467BR operate from a single 12 V supply?

Yes, the ADG467BR supports unipolar operation with VDD = +12 V and VSS = 0 V. In this configuration, the lower clamp threshold becomes 0 V + 1.5 V = +1.5 V and upper clamp is +12 V − 1.5 V = +10.5 V. The device maintains 62 Ω typical RON and ±1 nA leakage, though RON increases slightly versus dual-supply operation. Single-supply use is validated in Figure 7 and Table 1 of the datasheet.