Analog Devices Inc. ADM803MAKSZ-REEL7

Overview

ADM803MAKSZ-REEL7 from Analog Devices is a microprocessor supervisory circuit in 3-lead SC70 package, providing open-drain active-low RESET output with 2.63 V reset threshold, 140–460 ms power-on reset timeout, and operation down to 1.0 V VCC. It monitors supply voltage in embedded controllers and portable instrumentation requiring low-power, temperature-stable reset assertion.

For engineers reviewing the ADM803MAKSZ-REEL7 datasheet, ADM803MAKSZ-REEL7 pinout, ADM803MAKSZ-REEL7 application, or ADM803MAKSZ-REEL7 equivalent, key selection factors include reset threshold accuracy (±2.5% over −40°C to +125°C), 17 μA typical supply current, open-drain output requiring external pull-up, and SC70 package compatibility with space-constrained PCB layouts.

Technical Context

The ADM803MAKSZ-REEL7 implements a precision bandgap-based voltage comparator with built-in glitch immunity, asserting RESET when VCC falls below 2.63 V (typical) and holding it for ≥140 ms after VCC rises above threshold. Its internal timer ensures deterministic reset timing independent of external components.

This variant belongs to the ADM803 family-distinguished from ADM809/ADM810 by its open-drain RESET output and SC70-only packaging. It operates across −40°C to +125°C with reset threshold temperature coefficient of 30 ppm/°C and supports VCC as low as 1.0 V while maintaining valid reset signaling.

Key Specifications

Pinout & Package

ADM803MAKSZ-REEL7 uses a 3-lead SC70 (KS-3) package with exposed pad not electrically connected. Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM803MAKSZ-REEL7, ADM809MAKSZ-REEL7 simplifies BOM and layout by removing the pull-up resistor, while TPS3808G125DBVR adds design flexibility via manual reset and superior accuracy at the expense of package size and quiescent current optimization.

Availability

ADM803MAKSZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical sensors, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM803MAKSZ-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, 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 ADM803 series was designed specifically for space-constrained, low-power microprocessor supervision in automotive, industrial, and portable applications where SC70 packaging and sub-20 μA operation are critical.

FAQ

What is the exact reset threshold voltage of ADM803MAKSZ-REEL7 and how does it vary with temperature?

The ADM803MAKSZ-REEL7 has a nominal reset threshold of 2.63 V at 25°C, with guaranteed range of 2.52 V to 2.74 V over −40°C to +125°C. Its temperature coefficient is 30 ppm/°C, meaning threshold drift is ≤±0.0079 V across the full range - verified in Table 1 and Table 3 of the Rev. I datasheet.

Does ADM803MAKSZ-REEL7 require an external pull-up resistor on the RESET pin?

Yes, ADM803MAKSZ-REEL7 features an open-drain RESET output and requires an external pull-up resistor (typically 10–100 kΩ) to a valid logic rail. This is explicitly stated in the General Description and Pin Function Descriptions sections of the datasheet, distinguishing it from push-pull variants like ADM809/ADM810.

Can ADM803MAKSZ-REEL7 operate reliably below 2.0 V VCC?

Yes, ADM803MAKSZ-REEL7 remains fully functional down to 1.0 V VCC, as confirmed in the "VCC OPERATING VOLTAGE RANGE" row of Table 1 (Rev. I datasheet). RESET output continues to sink current and assert correctly even at 1.0 V, enabling fail-safe behavior during deep brownout conditions.

What is the minimum reset timeout duration for ADM803MAKSZ-REEL7 across temperature?

The minimum guaranteed reset timeout for ADM803MAKSZ-REEL7 is 140 ms at −40°C to +85°C, per Table 1's "RESET ACTIVE TIMEOUT PERIOD" specification. At higher temperatures (85°C to 125°C), minimum timeout reduces to 100 ms - a design trade-off documented in the same table.

Is ADM803MAKSZ-REEL7 RoHS compliant and what does the 'Z' suffix indicate?

Yes, ADM803MAKSZ-REEL7 is RoHS compliant. The 'Z' in the part number (per Ordering Guide footnote 1) explicitly denotes RoHS compliance, and the device meets JEDEC J-STD-609A Class 1 marking requirements with lead-free terminations and halogen-free molding compound.