Analog Devices Inc. ADG467BRZ-REEL7

Overview

ADG467BRZ-REEL7 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 operates from ±4.5 V to ±20 V dual supplies. It is used in hot-insertion rack systems to safeguard ADC inputs during live board insertion.

For engineers reviewing the ADG467BRZ-REEL7 datasheet, ADG467BRZ-REEL7 pinout, ADG467BRZ-REEL7 application, or ADG467BRZ-REEL7 equivalent, key selection criteria include fault-clamped output behavior (VDD − 1.5 V / VSS + 1.5 V), trench-isolated latch-up immunity, SOIC-18 package compatibility, and sub-μA supply current under fault conditions.

Technical Context

The ADG467BRZ-REEL7 implements a per-channel series topology of two N-channel and two P-channel MOSFETs with trench isolation, enabling bidirectional signal conduction and intrinsic overvoltage clamping without external components. Its operation is defined by threshold-based clamping: positive overvoltage triggers NMOS saturation at VDD − 1.5 V, negative overvoltage triggers PMOS saturation at VSS + 1.5 V.

When powered, it behaves as a low-R_ON analog switch (62 Ω typ); when unpowered, all MOSFETs turn off, yielding open-circuit signal paths with ±0.5 nA typical input leakage. The device supports both bipolar (±15 V) and unipolar (e.g., +10 V/0 V) supply configurations while maintaining specified R_ON flatness (6 Ω max) and match (5 Ω max) across channels.

Key Specifications

Pinout & Package

ADG467BRZ-REEL7 is supplied in an 18-lead SOIC_W (RW-18) package, RoHS-compliant, with 1.27 mm pitch and JEDEC MS-013-AB compliance. Pin 1 is VD1; pins 9 and 18 are VSS and VDD respectively; pins 10–17 are VS8 through VS1; pins 1–8 are VD1 through VD8. No pins are internally connected to substrate or thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG467BRZ-REEL7, ADG469BRZ-REEL7 offers identical protection specs in a hex configuration-ideal for channel-count-optimized layouts-while MAX4677ESE+ provides functional equivalence with slightly reduced fault margin and higher on-resistance, necessitating recalibration in precision measurement chains.

Availability

ADG467BRZ-REEL7 is available at Aetrix Electronics and suitable for ATE equipment, sensitive measurement instruments, and hot-insertion rack systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADG467BRZ-REEL7 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.

The ADG467BRZ-REEL7 belongs to Analog Devices' precision channel protection product line, engineered specifically for fault-resilient analog signal conditioning in environments where power sequencing is unreliable or transient overvoltages are unavoidable.

FAQ

What is the maximum continuous overvoltage the ADG467BRZ-REEL7 can withstand with power supplies disconnected?

The ADG467BRZ-REEL7 can withstand continuous analog input overvoltages from −40 V to +40 V when VDD and VSS are at 0 V. This capability is confirmed in the Absolute Maximum Ratings table (Table 2) and enables safe operation during hot-swap events in rack-mounted systems before power rails stabilize. The device achieves this via intrinsic MOSFET cutoff behavior, limiting input leakage to ±0.5 nA typical under these conditions.

Does the ADG467BRZ-REEL7 require external clamping diodes for overvoltage protection?

No, the ADG467BRZ-REEL7 does not require external clamping diodes. Its internal trench-isolated MOSFET structure provides inherent bidirectional clamping at VDD − 1.5 V (positive faults) and VSS + 1.5 V (negative faults) when powered, and open-circuit isolation when unpowered. External TVS diodes are only recommended for transients exceeding ±40 V or in conjunction with the ADG467BRZ-REEL7 for enhanced surge energy handling per Figure 28 of the datasheet.

What is the typical on-resistance of the ADG467BRZ-REEL7 and how does it vary with temperature?

The ADG467BRZ-REEL7 has a typical on-resistance of 62 Ω at +25°C with ±15 V supplies. According to Figure 5 in the datasheet, R_ON increases to approximately 75 Ω at −40°C and 85 Ω at +85°C under the same conditions. This monotonic increase is due to MOSFET channel resistance temperature dependence and remains within the 95 Ω maximum specification across the full industrial temperature range.

Can the ADG467BRZ-REEL7 be used with single-supply operation?

Yes, the ADG467BRZ-REEL7 supports single-supply operation. The datasheet specifies operation with VDD = +10.8 V to +20 V and VSS = 0 V (Table 1, Power Requirements). In this configuration, the negative clamp becomes 0 V + 1.5 V = +1.5 V, and the positive clamp is VDD − 1.5 V. Performance metrics including R_ON and leakage remain valid, as verified in Figure 7 (single-supply R_ON vs. VDD).

Is the ADG467BRZ-REEL7 latch-up immune, and what technology enables this?

Yes, the ADG467BRZ-REEL7 is latch-up immune due to its trench isolation construction. As described in the Trench Isolation section (Page 11), dielectric oxide trenches physically separate the N-channel and P-channel MOSFETs, eliminating parasitic SCR formation pathways. This design prevents destructive latch-up even under sustained overvoltage or supply sequencing faults - a key reliability feature validated across the full −40°C to +85°C operating range.