Analog Devices Inc. ADG465BRM

Overview

ADG465BRM from Analog Devices is a single-channel analog channel protector designed for bidirectional signal path protection in precision measurement and hot-insertion systems. It features ±40 V fault tolerance with power off, 80 Ω typical on-resistance at ±15 V supplies, ±1 nA max channel leakage at 25°C, and operates across −40°C to +85°C. It protects ADC inputs during supply sequencing faults or overvoltage transients.

For engineers reviewing the ADG465BRM datasheet, ADG465BRM pinout, ADG465BRM application, or ADG465BRM equivalent, this page delivers verified technical context, package-specific pin mapping (MSOP-8), real-world clamping behavior under fault conditions, and validated alternatives for overvoltage-protected analog front-ends.

Technical Context

The ADG465BRM implements a four-MOSFET trench-isolated architecture: two NMOS and two PMOS devices arranged to provide bidirectional clamping. Its operation relies on threshold-based conduction-normal signal range is (VSS + 1.5 V) to (VDD − 1.5 V); outside that, output clamps to VSS + 1.5 V or VDD − 1.5 V depending on polarity.

Unlike diode-based protectors, it remains functional with zero supply voltage: all MOSFETs turn off, yielding nanoampere-level leakage and open-circuit isolation. Trench isolation eliminates parasitic SCR formation, making it latch-up proof even under ±40 V overvoltage with VDD = VSS = 0 V.

Key Specifications

Pinout & Package

ADG465BRM is supplied in an 8-lead MSOP package (RM-8), with exposed pad not internally connected. Pin 1 is marked by a dot or notch; pins are numbered counterclockwise from top-left when viewed from top.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG465BRM, ADG467BRMZ offers channel density advantage without compromising protection specs, while MAX4505EUA+ trades fault margin and latch-up immunity for lower unit cost - making ADG465BRM the optimal choice for industrial ATE and precision measurement where reliability is non-negotiable.

Availability

ADG465BRM is available at Aetrix Electronics and suitable for ATE equipment, sensitive measurement front-ends, hot-insertion rack systems, and ADC input channel protection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADG465BRM 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and industrial control.

The ADG465BRM belongs to Analog Devices' channel protector product line, engineered specifically for fault-tolerant analog signal conditioning in environments where supply sequencing cannot be guaranteed and overvoltage resilience is critical.

FAQ

What is the maximum continuous overvoltage the ADG465BRM can withstand with power supplies disconnected?

The ADG465BRM withstands continuous analog input overvoltage from −40 V to +40 V when VDD and VSS are at 0 V. During this condition, all internal MOSFETs are fully off, limiting input leakage to ±0.015 µA typical and presenting open-circuit isolation - a key differentiator for hot-swap and power-fail scenarios.

Does the ADG465BRM require external components to function as a channel protector?

No, the ADG465BRM operates as a standalone channel protector with only VDD, VSS, VS1, and VD1 connections required. No external resistors, capacitors, or diodes are needed for basic overvoltage clamping. However, RC networks on VDD/VSS may be added for controlled power-up sequencing in rack systems, per Figure 20 of the datasheet.

Can the ADG465BRM be used with unipolar supplies such as +5 V and GND?

Yes, the ADG465BRM supports unipolar operation: configure VDD = +5 V and VSS = GND (0 V). In this mode, the negative clamping threshold becomes GND + 1.5 V = +1.5 V, and positive clamping occurs at +5 V − 1.5 V = +3.5 V. Signal range is limited to +1.5 V to +3.5 V, but fault protection remains active up to −40 V/+40 V with power off.

How does the ADG465BRM compare to TVS diodes for analog input protection?

TVS diodes offer faster transient response but exhibit high standby leakage (e.g., 300 µA) and no protection with power off. The ADG465BRM provides sub-nA leakage, zero-power isolation, and precise clamping thresholds - making it complementary rather than competitive. Best practice is cascading: TVS first for ESD/surge, then ADG465BRM for precision clamping and power-off protection.

Is the ADG465BRM pin-compatible with other Analog Devices channel protectors like the ADG465BRTZ?

No - ADG465BRM (MSOP-8) and ADG465BRTZ (SOT-23-6) use different packages and pinouts. ADG465BRM has dedicated VDD (Pin 1), VS1 (Pin 2), VSS (Pin 6), and VD1 (Pin 7); ADG465BRTZ uses VDD (Pin 6), VS1 (Pin 4), VSS (Pin 3), and VD1 (Pin 1). PCB layout and decoupling must be redesigned for each package - they are functionally identical but not mechanically interchangeable.