Analog Devices Inc. ADG467BRSZ

Overview

ADG467BRSZ from Analog Devices is an octal channel protector IC designed for fault-tolerant analog signal path protection in systems with unreliable power sequencing. It provides ±40 V overvoltage tolerance, 62 Ω typical on-resistance, ±1 nA max channel leakage at +25°C, and operates from ±15 V dual supplies. It is used in hot-insertion rack systems to safeguard ADC inputs during live board insertion.

For engineers reviewing the ADG467BRSZ datasheet, ADG467BRSZ pinout, ADG467BRSZ application, or ADG467BRSZ equivalent, key selection criteria include fault-clamp voltage (VDD − 1.5 V / VSS + 1.5 V), trench-isolated latch-up immunity, SOIC/SSOP package compatibility, and sub-μA off-state leakage under power loss.

Technical Context

The ADG467BRSZ implements eight independent channel protectors, each composed of two N-channel and two P-channel MOSFETs in series with trench isolation. Its clamping behavior activates when input voltage exceeds VDD − 1.5 V (positive fault) or falls below VSS + 1.5 V (negative fault), limiting output to safe thresholds without external components.

It functions across bipolar (±15 V) and unipolar supplies, remains open-circuit with power off, and delivers 6 Ω max RON flatness over ±5 V input range. The device draws only ±0.05 μA typical supply current and withstands continuous ±40 V input transients even with VDD/VSS = 0 V.

Key Specifications

Pinout & Package

ADG467BRSZ is packaged in a 20-lead SSOP (RS-20) with 0.65 mm pitch, 7.8 mm × 5.3 mm body size, and exposed thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG467BRSZ, ADG469BRSZ offers doubled channel count in identical packaging for space-constrained designs, while MAX4677ESE+ trades trench isolation and tighter RON matching for lower unit cost - making ADG467BRSZ optimal for high-reliability, precision, and safety-critical analog protection.

Availability

ADG467BRSZ is available at Aetrix Electronics and suitable for ATE equipment, sensitive measurement equipment, and hot insertion rack systems requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for ADG467BRSZ 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 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 ADG467BRSZ belongs to Analog Devices' precision protection IC product line, engineered specifically for fault-resilient analog signal conditioning in environments where power sequencing is uncontrolled and overvoltage events are probable.

FAQ

What is the maximum continuous overvoltage the ADG467BRSZ can withstand with power supplies disconnected?

The ADG467BRSZ can withstand continuous analog input voltages from −40 V to +40 V even when VDD and VSS are at 0 V. Under this condition, all internal MOSFETs are fully off, limiting input leakage to ±0.5 nA typical and preventing latch-up or damage - a core capability enabling safe hot insertion in rack systems.

Does the ADG467BRSZ require external components to achieve its ±40 V fault protection?

No, the ADG467BRSZ achieves ±40 V fault protection intrinsically via its four-MOSFET channel architecture and trench isolation - no external diodes, resistors, or TVS devices are needed for basic clamping functionality. External TVS devices may be added only for surge levels exceeding ±40 V or to meet specific system-level EMC requirements.

How does the ADG467BRSZ behave when power is removed during normal signal operation?

When VDD and VSS are removed, the ADG467BRSZ transitions to an open-circuit state: all eight channels present >1 GΩ impedance, and input/output leakage drops to ±0.5 nA typical. This prevents back-driving of powered downstream circuitry and eliminates risk of latch-up - a critical feature for hot-swap and fail-safe system architectures.

What is the significance of trench isolation in the ADG467BRSZ?

Trench isolation in the ADG467BRSZ uses dielectric oxide barriers to physically separate NMOS and PMOS transistors, eliminating parasitic SCR formation. This makes the device inherently latch-up proof - unlike junction-isolated alternatives - ensuring reliable operation during overvoltage faults and power cycling without destructive current runaway.

Can the ADG467BRSZ be used with single-supply operation?

Yes, the ADG467BRSZ supports single-supply operation: VSS may be connected to ground while VDD supplies +5 V to +20 V. In this configuration, the lower clamp threshold becomes +1.5 V (VSS + 1.5 V), and the upper remains VDD − 1.5 V - enabling protection in unipolar sensor interfaces, PLC analog inputs, and other grounded-system applications.