Analog Devices Inc. ADM811LARTZ-REEL

Overview

ADM811LARTZ-REEL from Analog Devices is a precision microprocessor supervisory circuit in 4-lead SOT-143 (RA-4) package, providing active-low reset assertion at 4.63 V threshold with ±5% tolerance over −40°C to +85°C, 140 ms minimum power-on reset timeout, and 5 µA typical supply current - used for reliable power-up sequencing and brownout protection in embedded controllers and safety-critical instrumentation.

For engineers reviewing the ADM811LARTZ-REEL datasheet, ADM811LARTZ-REEL pinout, ADM811LARTZ-REEL application, or ADM811LARTZ-REEL equivalent, this page delivers verified functional role, exact reset threshold behavior, manual reset timing constraints, glitch-immune MR interface, and RoHS-compliant SOT-143 packaging details required for production-grade system reliability validation.

Technical Context

The ADM811LARTZ-REEL implements a bandgap-referenced voltage monitor with internal hysteresis and a precision 140 ms reset timeout timer. Its reset output remains valid down to VCC = 1.0 V, ensuring deterministic microprocessor hold during supply decay.

It features debounced manual reset input (MR) with 10 µs minimum pulse width acceptance and 100 ns glitch immunity, plus logic-level compatible RESET output that sinks up to 3.2 mA at VCC = VTH(MAX), supporting direct interface to TTL and CMOS microcontrollers without external pull-ups.

Key Specifications

Pinout & Package

ADM811LARTZ-REEL uses a 4-lead SOT-143 (RA-4) package per JEDEC TO-253-AA standard, with 1.92 mm × 1.40 mm body, 0.90 mm height, and 0.54 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811LCSA+ and TPS3808G33DBVR, the ADM811LARTZ-REEL provides exact 4.63 V threshold compatibility with 5 V systems, guaranteed reset hold down to 1 V, and identical SOT-143 pinout to other ADM811 variants - making it optimal for drop-in replacement in existing Analog Devices-based designs requiring RoHS compliance.

Availability

ADM811LARTZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, and railway signaling interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM811LARTZ-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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.

The ADM811/ADM812 family was designed specifically for robust microprocessor supervision in harsh environments - delivering accurate voltage monitoring, glitch-immune manual reset, and fail-safe reset assertion down to 1 V for mission-critical embedded applications.

FAQ

What is the exact reset threshold voltage for ADM811LARTZ-REEL and its tolerance over temperature?

The ADM811LARTZ-REEL has a nominal reset threshold of 4.63 V, with a guaranteed range of 4.50 V to 4.75 V over the full operating temperature range of −40°C to +85°C. This ±5% tolerance ensures reliable detection of 5 V supply degradation before critical system instability occurs, and is confirmed in Table 1 and Table 4 of the Rev. H datasheet.

Does ADM811LARTZ-REEL support operation at VCC below 2.0 V, and what happens to the RESET output?

Yes, ADM811LARTZ-REEL operates down to VCC = 1.2 V (minimum specified), and its RESET output remains valid (low) down to VCC = 1.0 V during power-down. Below 0.8 V, RESET becomes high-impedance; therefore, a 100 kΩ pull-down resistor is recommended to prevent floating logic states, as documented in Figure 11 and the "Ensuring a Valid RESET Output Down to VCC = 0 V" section.

What is the minimum pulse width required on the MR pin to trigger a reset event in ADM811LARTZ-REEL?

The ADM811LARTZ-REEL requires a minimum MR pulse width of 10 µs to guarantee reset activation. Pulses shorter than 100 ns are rejected due to internal debounce filtering, making it immune to switch bounce and EMI. This specification is explicitly stated in the "Manual Reset" section and Table 1 under "Minimum Pulse Width".

Is ADM811LARTZ-REEL RoHS compliant, and how is compliance indicated in the ordering code?

Yes, ADM811LARTZ-REEL is RoHS compliant. The "Z" suffix in the part number explicitly denotes RoHS compliance per Analog Devices' Ordering Guide (Page 10), and the device carries appropriate branding (M4J) and packaging (RA-4) consistent with lead-free manufacturing standards.

What is the power-on reset timeout duration for ADM811LARTZ-REEL, and is it adjustable?

The ADM811LARTZ-REEL provides a fixed 140 ms minimum power-on reset timeout after VCC rises above the reset threshold. This duration is internally generated and not user-adjustable; it is guaranteed across temperature and supply voltage, as specified in Table 1 under "RESET Active Timeout Period" and confirmed in Figure 6.