Analog Devices Inc. ADM811MARTZ-REEL

Overview

ADM811MARTZ-REEL from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 (RA-4) package, providing active-low reset output with 4.38 V threshold, 140 ms minimum reset timeout, and 5 µA typical supply current. It monitors 5 V supply rails in embedded controllers and safety-critical systems where reliable power-on and brownout reset is required.

For engineers reviewing the ADM811MARTZ-REEL datasheet, ADM811MARTZ-REEL pinout, ADM811MARTZ-REEL application, or ADM811MARTZ-REEL equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +85°C), manual reset debounce (10 µs min pulse width), glitch immunity (100 ns), valid RESET down to VCC = 1 V, and RoHS-compliant SOT-143 packaging.

Technical Context

The ADM811MARTZ-REEL implements a precision bandgap voltage reference with 30 ppm/°C temperature coefficient to generate a stable 4.38 V reset threshold. Its internal reset generator holds RESET low for ≥140 ms after VCC rises above threshold, ensuring microprocessor stabilization during power-up.

It features a debounced manual reset input (MR) that rejects <100 ns glitches and responds to ≥10 µs pulses, and guarantees valid logic-level RESET output even as VCC falls to 1 V - critical for orderly system shutdown in automotive and industrial applications.

Key Specifications

Pinout & Package

ADM811MARTZ-REEL uses a 4-lead SOT-143 (JEDEC TO-253-AA, Analog Devices RA-4) package, 2.90 mm × 1.40 mm × 1.07 mm, with gull-wing leads and 0.95 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811MESA+ and TPS3808G33DBVR, ADM811MARTZ-REEL uniquely combines 4.38 V threshold, 1 V minimum VCC operation, integrated manual reset, and 5 µA supply current - making it optimal for robust 5 V microcontroller supervision in harsh environments.

Availability

ADM811MARTZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical patient monitors requiring stable component supply, RoHS compliance, and long-lifecycle availability.

Supply support for ADM811MARTZ-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, headquartered in Norwood, MA.

The ADM811/ADM812 family was designed specifically for microprocessor supervisory functions in industrial, automotive, and safety-critical systems where precise, low-power, and glitch-immune reset generation is essential.

FAQ

What is the exact reset threshold voltage of ADM811MARTZ-REEL and how tightly is it specified?

The ADM811MARTZ-REEL has a nominal reset threshold of 4.38 V at 25°C, with a guaranteed range of 4.25 V to 4.50 V over the full −40°C to +85°C operating temperature range. This ±2.5% tolerance ensures reliable detection of 5 V supply degradation while maintaining compatibility with standard 5 V logic margins. The threshold is generated by a precision bandgap reference with 30 ppm/°C temperature coefficient, minimizing drift across thermal conditions. All specifications are validated per Analog Devices Rev. H datasheet.

Does ADM811MARTZ-REEL support manual reset, and what are the timing requirements?

Yes, ADM811MARTZ-REEL includes a dedicated MR (manual reset) pin that is active-low and internally debounced. It requires a minimum pulse width of 10 µs to trigger a reset, and rejects transients shorter than 100 ns - eliminating false triggers from switch bounce or EMI. The MR input thresholds are VIL ≤ 0.8 V and VIH ≥ 2.3 V when VCC > VTH(MAX), ensuring robust interfacing with standard logic outputs. Leaving MR floating disables manual reset functionality.

What is the minimum VCC voltage at which ADM811MARTZ-REEL maintains a valid RESET output?

ADM811MARTZ-REEL guarantees a valid active-low RESET output down to VCC = 1.0 V at −40°C to +85°C, and down to 1.2 V across the full temperature range. Below 1.0 V, the output enters high-impedance state; therefore, a 100 kΩ pull-down resistor is recommended on RESET to prevent floating logic levels during deep brownout. This behavior ensures deterministic microprocessor shutdown and prevents spurious activity during power collapse - a key differentiator versus alternatives that lose reset validity above 1.8 V.

What package type and footprint does ADM811MARTZ-REEL use, and is it RoHS compliant?

ADM811MARTZ-REEL uses the 4-lead SOT-143 package (JEDEC TO-253-AA, Analog Devices RA-4), measuring 2.90 mm × 1.40 mm × 1.07 mm with 0.95 mm lead pitch. It is RoHS compliant, as indicated by the "Z" suffix in the part number and confirmed in the Ordering Guide. The device is supplied on 10,000-piece reels (REEL designation), and branding code "MBT" appears on the top surface. No lead-free conversion or exemption documentation is required for standard use.

How does the reset timeout period behave across temperature and supply voltage variations?

The ADM811MARTZ-REEL provides a minimum reset timeout of 140 ms after VCC rises above the 4.38 V threshold, extending up to 560 ms depending on VCC and temperature. Figure 6 in the Rev. H datasheet shows this variation: at 25°C and VCC = VTH(MAX), timeout is ~250 ms typical; it increases slightly at low temperature and decreases at high temperature. The timeout is generated by an internal RC timer independent of external components, ensuring consistent behavior without layout dependencies. This guarantees sufficient hold time for microprocessor clock stabilization and memory initialization under all operating conditions.