Analog Devices Inc. ADM803SAKSZ-REEL7

Overview

ADM803SAKSZ-REEL7 from Analog Devices is a microprocessor supervisory circuit in 3-lead SC70 package, featuring open-drain active-low RESET output, 2.93 V reset threshold (±2.5% over −40°C to +125°C), 140–460 ms power-on reset timeout, and 17 μA supply current at VCC < 3.6 V. It monitors VCC down to 1 V and asserts reset during power-up, brownout, and power-down conditions in embedded controllers and instrumentation.

For engineers reviewing the ADM803SAKSZ-REEL7 datasheet, ADM803SAKSZ-REEL7 pinout, ADM803SAKSZ-REEL7 application, or ADM803SAKSZ-REEL7 equivalent, key selection criteria include reset threshold accuracy (2.93 V ±2.5%), open-drain output requiring external pull-up, SC70 package compatibility with space-constrained PCBs, and operation across −40°C to +125°C industrial temperature range.

Technical Context

The ADM803SAKSZ-REEL7 integrates a precision voltage comparator with built-in glitch immunity and an internal 240 ms (typical) reset timer. Its reset assertion remains valid even as VCC drops to 1 V, enabling reliable system initialization under marginal supply conditions.

Unlike push-pull variants (ADM809/ADM810), the ADM803SAKSZ-REEL7 uses an open-drain RESET output, mandating an external pull-up resistor for logic-level translation and enabling wired-OR configurations with multiple reset sources in complex systems.

Key Specifications

Pinout & Package

ADM803SAKSZ-REEL7 is housed in a 3-lead SC70 (KS-3) package with exposed pad not electrically connected. Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX809SEUR+T and TPS3808G12QDBVRQ1, the ADM803SAKSZ-REEL7 offers tighter threshold accuracy (±2.5% vs. ±2.7% and ±2.0%), smallest PCB footprint (SC70), and guaranteed operation down to 1 V VCC-critical for systems where supply collapse must trigger reset before logic failure.

Availability

ADM803SAKSZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM803SAKSZ-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 ADM803 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for reliable power-on reset, brownout protection, and supply voltage monitoring in space- and power-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of the ADM803SAKSZ-REEL7 and how does it vary with temperature?

The ADM803SAKSZ-REEL7 has a nominal reset threshold of 2.93 V, with tolerance of ±2.5% over the full operating temperature range of −40°C to +125°C. At 25°C, the threshold is 2.93 V (typical); over −40°C to +85°C, it ranges from 2.85 V to 3.00 V; and over −40°C to +125°C, it extends to 2.81 V to 3.05 V. This tight specification ensures consistent behavior across harsh thermal environments without external calibration.

Does the ADM803SAKSZ-REEL7 require an external pull-up resistor on the RESET pin, and why?

Yes, the ADM803SAKSZ-REEL7 requires an external pull-up resistor on the RESET pin because it features an open-drain output. The internal transistor only sinks current when RESET is asserted (low); to establish a defined logic-high level when deasserted, a pull-up resistor (typically 10 kΩ to 47 kΩ to VCC or another logic rail) is mandatory. This architecture enables wired-OR reset networks and level translation, which the ADM803SAKSZ-REEL7 leverages for flexible system integration.

Can the ADM803SAKSZ-REEL7 operate reliably when the supply voltage drops below 2.0 V?

Yes, the ADM803SAKSZ-REEL7 remains fully functional and continues to assert RESET down to VCC = 1.0 V, as specified in its absolute operating range. Its internal comparator and timer maintain accuracy and timing integrity even at sub-2.0 V levels, making it suitable for applications where deep brownout detection is required-such as battery-backed systems or supplies with steep dropout characteristics-unlike many supervisory ICs that cease operation below 1.8 V.

What is the minimum and maximum reset timeout duration for the ADM803SAKSZ-REEL7 across its full temperature range?

The ADM803SAKSZ-REEL7 provides a reset active timeout period ranging from 140 ms (minimum) to 460 ms (maximum) over −40°C to +85°C, and from 100 ms to 840 ms over +85°C to +125°C. The typical timeout is 240 ms at 25°C. This wide tolerance accommodates process variation and temperature drift while ensuring sufficient hold time for microprocessor and peripheral initialization in all operating conditions.

Is the ADM803SAKSZ-REEL7 RoHS compliant and what packaging format does it ship in?

Yes, the ADM803SAKSZ-REEL7 is RoHS compliant, indicated by the "Z" suffix in its part number and confirmed in the Analog Devices ordering guide. It ships in tape-and-reel format (REEL7) containing 3,000 units per reel, packaged in JEDEC-standard 3-lead SC70 (KS-3) outline with bottom marking "M50" and date code. The SC70 package is lead-free and compatible with standard Pb-free reflow profiles.