Analog Devices Inc. ADM811LARTZ-REEL7

Overview

ADM811LARTZ-REEL7 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-REEL7 datasheet, ADM811LARTZ-REEL7 pinout, ADM811LARTZ-REEL7 application, or ADM811LARTZ-REEL7 equivalent, this page delivers verified functional identity, validated reset timing behavior, confirmed SOT-143 pin mapping, and real-world alternative part comparisons - all grounded in Analog Devices Rev. H datasheet specifications.

Technical Context

The ADM811LARTZ-REEL7 implements a precision bandgap voltage reference with 30 ppm/°C temperature coefficient to monitor VCC and assert RESET when supply drops below 4.63 V (25°C) or 4.50–4.75 V (−40°C to +85°C). Its internal timer guarantees ≥140 ms reset pulse width after VCC rises above threshold.

A debounced manual reset input (MR) rejects glitches <100 ns and responds to pulses >10 µs; RESET output remains valid down to VCC = 1 V, ensuring deterministic microprocessor shutdown during power collapse - critical for automotive and portable instrument reliability.

Key Specifications

Pinout & Package

ADM811LARTZ-REEL7 is housed in a JEDEC-compliant 4-lead SOT-143 (RA-4) surface-mount package with 1.3 mm × 2.9 mm footprint and 0.95 mm height - optimized for space-constrained PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811LCSA+, ADM811LARTZ-REEL7 offers superior brownout resilience (valid RESET to 1 V) and lower power; versus TPS3808G33DBVR, it provides exact 4.63 V 5 V-rail monitoring and integrated MR in identical SOT-143 footprint - making it optimal for industrial and automotive 5 V supervisory upgrades.

Availability

ADM811LARTZ-REEL7 is available at Aetrix Electronics and suitable for industrial controller monitoring, automotive body control modules, and portable medical instruments requiring stable component supply, RoHS compliance, and long-term lifecycle support.

Supply support for ADM811LARTZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with engineering resources spanning signal conditioning, power management, and precision sensing.

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 industrial, automotive, and safety-critical applications.

FAQ

What is the exact reset threshold voltage of ADM811LARTZ-REEL7 and how does it vary with temperature?

The ADM811LARTZ-REEL7 has a nominal reset threshold of 4.63 V at 25°C, with guaranteed range of 4.50 V to 4.75 V over −40°C to +85°C. This ±5% tolerance is maintained by an internal bandgap reference with 30 ppm/°C temperature coefficient - ensuring consistent 5 V rail monitoring across automotive and industrial thermal profiles. The ADM811LARTZ-REEL7 datasheet Rev. H Table 1 confirms these values under specified test conditions.

Does ADM811LARTZ-REEL7 provide active-high or active-low reset output, and what is its drive capability?

ADM811LARTZ-REEL7 provides an active-low RESET output (pin 2), sinking up to 3.2 mA at VCC = VTH(MAX) with 0.4 V max low-level voltage - compatible with standard TTL and CMOS microprocessor /RESET inputs. It does not provide active-high output; that function is implemented in the ADM812 variant. The ADM811LARTZ-REEL7 output remains valid down to VCC = 1 V, unlike many competitors that fail below 1.2 V.

What is the minimum manual reset pulse width required to trigger ADM811LARTZ-REEL7, and how is noise rejection implemented?

The ADM811LARTZ-REEL7 requires a minimum manual reset (MR) pulse width of 10 µs to guarantee recognition, while rejecting transients shorter than 100 ns - achieved via internal digital debounce circuitry. This eliminates need for external RC filters and supports direct connection to mechanical switches or noisy control lines. The ADM811LARTZ-REEL7 MR pin thresholds are defined as rising above 2.3 V or falling below 0.8 V (for L/M variants) per Rev. H datasheet Table 1.

Is ADM811LARTZ-REEL7 RoHS compliant, and what does the 'Z' suffix indicate in the part number?

Yes, ADM811LARTZ-REEL7 is RoHS compliant - the 'Z' suffix explicitly denotes RoHS-compliant packaging per Analog Devices Ordering Guide (Rev. H, Page 10). It uses lead-free terminations and meets EU Directive 2011/65/EU requirements. The device is supplied in 3,000-unit tape-and-reel format (REEL7) and branded 'M4J' on the top surface, confirming full environmental compliance without performance trade-offs.

What package type and dimensions does ADM811LARTZ-REEL7 use, and is it pin-compatible with other ADM811 variants?

ADM811LARTZ-REEL7 uses the JEDEC-standard 4-lead SOT-143 (RA-4) package measuring 1.3 mm × 2.9 mm × 0.95 mm - identical across all ADM811/ADM812 variants including ADM811MARTZ-REEL7 and ADM811TARTZ-REEL7. Pinout is fully consistent: GND (1), RESET (2), MR (3), VCC (4). This allows direct substitution between voltage-threshold variants without PCB layout changes, provided system-level reset polarity and timing requirements align.