Analog Devices Inc. ADG467BRS

Overview

ADG467BRS from Analog Devices is an octal channel protector IC designed for fault-tolerant analog signal path protection in hot-insertion and ATE systems. It provides ±40 V overvoltage withstand capability, 62 Ω typical on-resistance with ±15 V supplies, and open-circuit behavior when power is off - enabling robust protection of sensitive ADC inputs during uncontrolled power sequencing.

For engineers reviewing the ADG467BRS datasheet, ADG467BRS pinout, ADG467BRS application, or ADG467BRS equivalent, this device is selected for high-reliability analog front-end protection where supply sequencing cannot be guaranteed, leakage current must remain below ±1 nA, and fault clamping to VDD − 1.5 V / VSS + 1.5 V is required under transients.

Technical Context

The ADG467BRS implements eight independent channel protectors, each composed of two N-channel and two P-channel MOSFETs in series with trench-isolated construction to prevent latch-up. Each channel operates as a low-R_ON series resistor (62 Ω typ) during normal operation within (VSS + 1.5 V) < V_IN < (VDD − 1.5 V), and automatically clamps output voltage during overvoltage or power-off conditions.

Under fault conditions - including ±40 V input with supplies off or V_IN exceeding VDD + 20 V / VSS − 20 V with supplies on - internal MOSFETs switch into saturation to limit output excursion and restrict leakage to sub-μA levels. The SSOP-20 package supports compact layout while maintaining full 8-channel isolation and thermal performance (θ_JA = 130°C/W).

Key Specifications

Pinout & Package

ADG467BRS is packaged in a 20-lead SSOP (RS-20) with 0.65 mm pitch, 7.8 mm × 5.3 mm body size, and 130°C/W thermal resistance. Pin 10 (NC) and Pin 20 (NC) are no-connect terminals and must remain unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG467BRS, ADG467BRZ offers identical protection performance in a larger SOIC package better suited for manual assembly, while ADG5462F trades higher on-resistance and footprint for diagnostic capability and wider fault margin - making ADG467BRS optimal for space-constrained, high-density ATE and rack-mount designs demanding minimal signal degradation.

Availability

ADG467BRS is available at Aetrix Electronics and suitable for automated test equipment, sensitive measurement instrumentation, and hot-insertion rack systems requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term industrial temperature support (−40°C to +85°C).

Supply support for ADG467BRS 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 precision instrumentation, industrial automation, and communications markets since 1965.

The ADG467BRS belongs to Analog Devices' channel protector product line, engineered specifically for fault-tolerant analog signal routing in environments where power sequencing is unreliable and transient overvoltages threaten system integrity.

FAQ

What is the maximum continuous overvoltage the ADG467BRS can withstand with power supplies disconnected?

The ADG467BRS can withstand continuous analog input voltages from −40 V to +40 V 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 any conductive path between VSx and VDx terminals - a key requirement for hot-swap safety in modular systems.

Does the ADG467BRS require external components to function as a channel protector?

No, the ADG467BRS operates autonomously without external passive components. Its trench-isolated MOSFET architecture provides inherent ±40 V fault tolerance, power-off open-circuit behavior, and self-clamping to VDD − 1.5 V / VSS + 1.5 V. External TVS diodes are optional only for surge events exceeding ±40 V or when system-level standards mandate redundant protection layers.

How does the ADG467BRS behave during incorrect power supply sequencing?

When VDD or VSS is applied after signal inputs - a common failure mode in hot-insertion systems - the ADG467BRS immediately enters fault-clamp mode. Output voltage is restricted to VDD − 1.5 V (positive fault) or VSS + 1.5 V (negative fault), protecting downstream CMOS devices from latch-up. This behavior is intrinsic to the device's MOSFET topology and requires no control logic or enable pins.

What is the R_ON match specification for the ADG467BRS, and why does it matter in multi-channel systems?

The ADG467BRS guarantees ≤5 Ω maximum R_ON mismatch between any two channels at ±10 V signal swing and 1 mA current. This tight matching ensures uniform gain and phase response across all eight protected paths - critical for coherent sampling in simultaneous multi-channel data acquisition systems where channel-to-channel skew or amplitude error would degrade FFT accuracy or harmonic distortion measurements.

Is the ADG467BRS pin-compatible with other members of the ADG467 family?

The ADG467BRS uses the 20-lead SSOP (RS-20) package with dedicated NC pins (10 and 20), while ADG467BR variants use the 18-lead SOIC_W (RW-18) package. They share identical pin functions for VD1–VD8, VS1–VS8, VDD, and VSS, but differ in physical layout, thermal performance (130°C/W vs. 160°C/W), and PCB footprint - requiring separate land patterns and not supporting direct drop-in replacement without board revision.