Analog Devices Inc. ADM809ZAKSZ-REEL

Overview

ADM809ZAKSZ-REEL from Analog Devices is a microprocessor supervisory circuit in 3-lead SC70 package, providing push-pull active-low RESET output with 2.32 V reset threshold, 140–460 ms power-on reset timeout, and operation down to 1 V VCC. It monitors supply voltage in embedded controllers and portable instrumentation requiring precise brownout detection.

For engineers reviewing the ADM809ZAKSZ-REEL datasheet, ADM809ZAKSZ-REEL pinout, ADM809ZAKSZ-REEL application, or ADM809ZAKSZ-REEL equivalent, key selection criteria include reset threshold accuracy (±1.5% at 25°C), low 17 μA supply current, −40°C to +125°C operating range, push-pull output drive capability, and SC70 footprint compatibility with space-constrained PCB layouts.

Technical Context

The ADM809ZAKSZ-REEL integrates a precision voltage comparator with built-in glitch immunity and an internal 240 ms (typical) reset timer. Its reference circuit maintains stable threshold performance across temperature (30 ppm/°C drift), enabling reliable reset assertion during slow-ramp power-up or fast transients.

Designed for direct interface with 1.8 V–5.5 V logic systems, it delivers push-pull RESET with 0.3 V max low-level output at 1.2 mA sink and 0.8×VCC min high-level output at 500 μA source-eliminating external pull-up components required by open-drain variants like the ADM803.

Key Specifications

Pinout & Package

ADM809ZAKSZ-REEL uses a 3-lead SC70 (KS-3) package with exposed pad not electrically connected. Pin 1 = GND, Pin 2 = RESET (active-low push-pull), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809ZTR, ADM809ZAKSZ-REEL offers 30°C wider temperature range and 15% lower supply current; versus TPS3808G125DBVR, it delivers fixed, guaranteed reset timing in a smaller SC70 package-reducing board area and eliminating timing component validation.

Availability

ADM809ZAKSZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ADM809ZAKSZ-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, automotive, communications, and healthcare markets since 1965.

The ADM809ZAKSZ-REEL belongs to Analog Devices' microprocessor supervisory IC family, engineered for deterministic power-on reset generation in safety-critical embedded systems where voltage margin and timing predictability are non-negotiable.

FAQ

What is the exact reset threshold voltage of the ADM809ZAKSZ-REEL and how does it vary with temperature?

The ADM809ZAKSZ-REEL has a nominal reset threshold of 2.32 V at 25°C, with guaranteed range of 2.25 V to 2.38 V at −40°C to +85°C and 2.22 V to 2.42 V at −40°C to +125°C. Its temperature coefficient is 30 ppm/°C, meaning threshold drift is bounded and predictable-critical for systems operating across wide ambient ranges. This specification is confirmed in Table 1 of the ADM803/ADM809/ADM810 Rev. I datasheet.

Does the ADM809ZAKSZ-REEL require an external pull-up resistor on the RESET pin?

No, the ADM809ZAKSZ-REEL features a push-pull RESET output, unlike the open-drain ADM803. It actively drives both logic high (≥0.8×VCC) and logic low (≤0.3 V at 1.2 mA) without external components. This eliminates pull-up resistor selection, reduces BOM count, and improves noise immunity-confirmed in the General Description and Pin Function Descriptions sections of the datasheet.

What is the minimum VCC voltage at which the ADM809ZAKSZ-REEL continues to assert RESET?

The ADM809ZAKSZ-REEL maintains valid RESET assertion down to VCC = 1.0 V, as specified in the "VCC Operating Voltage Range" parameter (Min = 1.0 V). Below this, the internal circuitry cannot guarantee correct comparator or timer operation. This capability enables reliable reset hold during deep brownout events common in battery-depleted or faulted power systems.

How does the ADM809ZAKSZ-REEL differ from the ADM803ZAKSZ-REEL in terms of output structure and application impact?

The ADM809ZAKSZ-REEL uses a push-pull RESET output, while the ADM803ZAKSZ-REEL uses open-drain. This means ADM809ZAKSZ-REEL drives high actively and requires no external pull-up, simplifying layout and improving rise-time consistency. ADM803ZAKSZ-REEL needs a pull-up resistor and offers wired-OR capability-making it suitable for multi-source reset buses, whereas ADM809ZAKSZ-REEL is optimized for single-supply point-of-load supervision.

Is the ADM809ZAKSZ-REEL RoHS compliant and what does the 'Z' suffix indicate in its ordering code?

Yes, the 'Z' in ADM809ZAKSZ-REEL denotes RoHS compliance per the Ordering Guide footnote: "Z = RoHS Compliant Part." The device meets EU Directive 2011/65/EU and is lead-free with matte tin finish. Full compliance documentation-including substance declarations and test reports-is available through Analog Devices' quality portal and authorized distributors like Digi-Key and Mouser.