Analog Devices Inc. ADM803LAKSZ-REEL7

Overview

ADM803LAKSZ-REEL7 from Analog Devices is a microprocessor supervisory circuit with open-drain active-low RESET output, 4.63 V reset threshold, −40°C to +125°C operating range, 17 μA supply current, and SC70-3 package. It monitors VCC in embedded controllers and ensures reliable power-on reset assertion for 240 ms (typical) during startup.

For engineers reviewing the ADM803LAKSZ-REEL7 datasheet, ADM803LAKSZ-REEL7 pinout, ADM803LAKSZ-REEL7 application, or ADM803LAKSZ-REEL7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), operation down to 1 V VCC, glitch-immune comparator, low-power supervision for battery-backed systems, and compatibility with 3 V/5 V microprocessor interfaces.

Technical Context

The ADM803LAKSZ-REEL7 implements a precision bandgap voltage reference and comparator to detect VCC falling below 4.63 V (±2.5% over −40°C to +125°C). Its internal timer guarantees 240 ms (typical) reset pulse width after VCC rises above threshold.

It features open-drain RESET output requiring external pull-up, operates with VCC as low as 1.0 V, and maintains reset assertion during brownout conditions. The comparator includes built-in glitch immunity against fast transients up to 100 mV overdrive.

Key Specifications

Pinout & Package

ADM803LAKSZ-REEL7 is housed in a 3-lead SC70 (KS-3) package, measuring 2.00 mm × 2.10 mm × 0.95 mm, with gull-wing leads and JEDEC-compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM803LAKSZ-REEL7, MAX809LUR+T offers push-pull simplicity but forfeits open-drain interoperability, while TPS3808G33DBVR targets lower-voltage rails and cannot replace 4.63 V threshold functionality - making ADM803LAKSZ-REEL7 uniquely suited for robust 5 V microprocessor supervision in harsh environments.

Availability

ADM803LAKSZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM803LAKSZ-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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The ADM803 series belongs to Analog Devices' microprocessor supervisory product line, engineered for deterministic power-on reset generation, brownout protection, and low-power operation in mission-critical embedded systems.

FAQ

What is the reset threshold voltage of the ADM803LAKSZ-REEL7?

The ADM803LAKSZ-REEL7 has a nominal reset threshold voltage of 4.63 V, with guaranteed tolerance of ±2.5% over the full operating temperature range of −40°C to +125°C. This value is specified in Table 3 and confirmed in the Ordering Guide for the "L" variant. The threshold remains stable across VCC variations and is referenced to an internal bandgap, ensuring consistent performance without external components. ADM803LAKSZ-REEL7 uses this precise threshold to monitor standard 5 V supply rails in industrial and automotive applications.

Does the ADM803LAKSZ-REEL7 have a push-pull or open-drain RESET output?

The ADM803LAKSZ-REEL7 features an open-drain active-low RESET output, as explicitly stated in the Features section and General Description. This requires an external pull-up resistor to define the high logic level, enabling wired-OR configurations and voltage-level translation. Unlike the ADM809/ADM810 variants, the ADM803 family-including ADM803LAKSZ-REEL7-does not provide push-pull drive. ADM803LAKSZ-REEL7's open-drain architecture supports flexible interface design in multi-source reset systems.

What package type and dimensions does the ADM803LAKSZ-REEL7 use?

The ADM803LAKSZ-REEL7 is packaged in a 3-lead SC70 (JEDEC KS-3) outline, with body dimensions of 2.00 mm × 2.10 mm × 0.95 mm and gull-wing lead form. Figure 15 in the datasheet confirms compliance with EIAJ SC70 standards. This compact, surface-mount package supports high-density PCB layouts and automated assembly. ADM803LAKSZ-REEL7's SC70 footprint differs from the SOT-23 option used by some ADM809/ADM810 variants, and its thermal impedance is 146°C/W (θJA).

Can the ADM803LAKSZ-REEL7 operate with supply voltages below 3 V?

Yes, the ADM803LAKSZ-REEL7 operates with VCC as low as 1.0 V while still asserting RESET, as verified in the Absolute Maximum Ratings and General Description sections. Its internal circuitry remains functional down to 1 V, ensuring fail-safe reset behavior during severe brownout or battery depletion. However, the 4.63 V threshold means it will assert RESET whenever VCC drops below that level - so sustained operation below 4.63 V is intentional supervision, not normal biasing. ADM803LAKSZ-REEL7 maintains this capability across its full −40°C to +125°C temperature range.

What is the typical reset timeout duration for the ADM803LAKSZ-REEL7?

The ADM803LAKSZ-REEL7 provides a typical reset timeout of 240 ms after VCC rises above the 4.63 V threshold, as documented in the Specifications table under "RESET ACTIVE TIMEOUT PERIOD" and illustrated in Figure 2. This fixed internal timer ensures the microprocessor remains held in reset long enough for oscillator startup, PLL lock, and memory initialization. The timeout varies from 140 ms to 460 ms over temperature, with 240 ms being the nominal value at 25°C. ADM803LAKSZ-REEL7 delivers this timing without external components.