Analog Devices Inc. ADG465BRT-REEL

Overview

ADG465BRT-REEL from Analog Devices is a single-channel analog channel protector in SOT-23 package, designed for series placement in signal paths to safeguard downstream circuitry (e.g., ADC inputs) against ±40 V overvoltage faults with or without power applied. It features 80 Ω typical on-resistance, ±1 nA max leakage at 25°C, and operates from ±15 V dual supplies. Its bidirectional operation and power-off open-circuit behavior make it ideal for hot-insertion rack systems.

For engineers reviewing the ADG465BRT-REEL datasheet, ADG465BRT-REEL pinout, ADG465BRT-REEL application, or ADG465BRT-REEL equivalent, key selection criteria include fault protection range (±40 V with power off), clamping behavior (VDD − 1.5 V / VSS + 1.5 V), trench-isolated latch-up immunity, low-leakage shutdown state, and compatibility with bipolar/unipolar supply configurations.

Technical Context

The ADG465BRT-REEL implements a four-MOSFET channel protector architecture: two NMOS and two PMOS devices with trench isolation, eliminating parasitic SCR formation and ensuring latch-up immunity. Its operation relies on threshold-based clamping-positive overvoltage triggers NMOS saturation at VDD − 1.5 V, negative overvoltage triggers PMOS saturation at VSS + 1.5 V.

Unlike diode-based protectors, it maintains high-impedance open-circuit state when VDD = VSS = 0 V, limiting input leakage to ±0.005 µA typical. Signal path resistance remains flat (8.5 Ω RON flatness over ±5 V) during normal operation (VSS + 1.5 V < VIN < VDD − 1.5 V), supporting precision measurement integrity.

Key Specifications

Pinout & Package

ADG465BRT-REEL is supplied in a 6-lead SOT-23 package (JEDEC MO-178-AB, RJ-6). Pin 1 = VD1 (bidirectional channel terminal), Pin 3 = VSS (−15 V rail), Pin 4 = VS1 (bidirectional channel terminal), Pin 6 = VDD (+15 V rail); Pins 2 and 5 are not internally connected (NIC) and must remain unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG465BRT-REEL, ADG467BRMZ offers higher integration per mm² but increases PCB area and cost for single-channel use, while MAX4505EUK+T trades fault margin and latch-up robustness for lower unit price - making ADG465BRT-REEL optimal for industrial ATE and precision measurement where reliability is non-negotiable.

Availability

ADG465BRT-REEL is available at Aetrix Electronics and suitable for automated test equipment, precision data acquisition systems, and hot-insertion rack interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADG465BRT-REEL 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, serving industrial, communications, and instrumentation markets since 1965.

The ADG465BRT-REEL belongs to Analog Devices' precision protection portfolio, engineered specifically for fault-tolerant analog signal conditioning in mission-critical test and measurement systems where power sequencing cannot be guaranteed.

FAQ

What is the maximum continuous overvoltage the ADG465BRT-REEL can withstand with power supplies disconnected?

The ADG465BRT-REEL withstands continuous analog input overvoltages from −40 V to +40 V when VDD = VSS = 0 V. This capability is confirmed in Table 2 (Absolute Maximum Ratings) of the Rev. C datasheet and enables safe operation during hot insertion into live backplanes before power rails stabilize. The device enters a high-impedance open state under these conditions, limiting leakage to ±0.005 µA typical.

Does the ADG465BRT-REEL require external components to function as a channel protector?

No, the ADG465BRT-REEL operates as a fully self-contained channel protector with only VDD, VSS, and the protected signal path (VD1/VS1) required. No external resistors, capacitors, or diodes are needed for basic overvoltage clamping. However, decoupling capacitors (e.g., 0.1 µF) on VDD/VSS are recommended per Figure 13 to maintain ACPSRR performance above 10 kHz.

How does the ADG465BRT-REEL behave when powered by unipolar supplies such as +5 V and GND?

The ADG465BRT-REEL supports unipolar operation: with VDD = +5 V and VSS = GND (0 V), its positive clamping threshold becomes +3.5 V (VDD − 1.5 V) and negative clamping threshold becomes +1.5 V (VSS + 1.5 V). This configuration protects against overvoltage above +3.5 V or below +1.5 V, making it suitable for single-supply sensor interfaces where negative transients are unlikely.

Is the ADG465BRT-REEL pin-compatible with other Analog Devices channel protectors like the ADG467?

No, the ADG465BRT-REEL (6-lead SOT-23) is not pin-compatible with the ADG467 (8-lead MSOP). Their pin counts, layouts, and terminal assignments differ fundamentally: ADG465BRT-REEL uses pins 1/4 for signal path and 3/6 for supplies, while ADG467 allocates dedicated pins for dual channels and shared supplies. Direct replacement requires PCB redesign.

What is the typical on-resistance flatness specification for the ADG465BRT-REEL and why does it matter?

The ADG465BRT-REEL exhibits 8.5 Ω RON flatness over a ±5 V input range (−5 V ≤ VS ≤ +5 V), meaning its resistance varies by only ±4.25 Ω around the 80 Ω typical value. This tight flatness preserves signal linearity and minimizes harmonic distortion in AC-coupled or wide-dynamic-range applications, critical for maintaining THD < −90 dB in audio or spectral analysis front-ends.