Analog Devices Inc. ADM812ZARTZ-REEL7

Overview

ADM812ZARTZ-REEL7 from Analog Devices is a precision microprocessor supervisory circuit in 4-lead SOT-143 (RA-4) package, providing active-high RESET output, 2.32 V reset threshold (±0.07 V over −40°C to +85°C), 5 µA typical supply current, and 140 ms minimum power-on reset timeout. It monitors 2.5 V supply rails in embedded controllers and safety-critical instrumentation.

For engineers reviewing the ADM812ZARTZ-REEL7 datasheet, ADM812ZARTZ-REEL7 pinout, ADM812ZARTZ-REEL7 application, or ADM812ZARTZ-REEL7 equivalent, this device delivers guaranteed reset assertion down to VCC = 1 V, manual reset debouncing with 10 µs minimum pulse width, and glitch immunity for noisy automotive and portable systems.

Technical Context

The ADM812ZARTZ-REEL7 implements a bandgap-based voltage reference with 30 ppm/°C temperature coefficient to maintain ±3% reset threshold accuracy across −40°C to +85°C. Its internal timer ensures 240 ms typical reset timeout after VCC rise above threshold, independent of supply ramp rate.

It features a debounced manual reset input (MR) rejecting <100 ns glitches and accepting >10 µs pulses, with logic-level detection thresholds scaling to 0.7 × VCC (rise) and 0.25 × VCC (fall). The RESET output remains valid up to VCC = 1 V during power-down.

Key Specifications

Pinout & Package

ADM812ZARTZ-REEL7 uses the JEDEC-compliant 4-lead SOT-143 (RA-4) package, 2.90 mm × 1.40 mm × 1.07 mm body size, 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 MAX812ZTR and TPS3808G12DBVR, ADM812ZARTZ-REEL7 uniquely combines 5 µA typical supply current, guaranteed 1 V reset validity, and fully integrated debounced MR - making it optimal for compact, low-power, safety-aware 2.5 V systems without external support components.

Availability

ADM812ZARTZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical instruments requiring stable component supply, RoHS compliance, and long-term lifecycle continuity.

Supply support for ADM812ZARTZ-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, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADM811/ADM812 family was designed specifically for robust, low-power microprocessor supervision in harsh environments - delivering precision voltage monitoring, glitch immunity, and guaranteed reset timing without external components.

FAQ

What is the reset threshold voltage of ADM812ZARTZ-REEL7 and its tolerance over temperature?

The ADM812ZARTZ-REEL7 has a nominal reset threshold of 2.32 V, with a specified range of 2.25 V to 2.38 V over the full operating temperature range of −40°C to +85°C. This 5.6% total window reflects ±3% accuracy relative to nominal, enabled by a 30 ppm/°C temperature coefficient. The value is confirmed in Table 4 and Table 1 of the Rev. H datasheet and applies specifically to the Z-suffix variant.

Does ADM812ZARTZ-REEL7 provide active-high or active-low reset output?

ADM812ZARTZ-REEL7 provides an active-high RESET output, as defined by the "ADM812" designation in the part number and confirmed in the Functional Block Diagram and Pin Function Descriptions (Page 6). When VCC falls below the 2.32 V threshold or MR is asserted low, RESET goes low; upon recovery, RESET remains high for ≥140 ms. This matches processor requirements such as ARM Cortex-M series.

What is the minimum VCC level at which ADM812ZARTZ-REEL7 maintains a valid RESET output?

ADM812ZARTZ-REEL7 asserts a valid RESET output down to VCC = 1 V, as explicitly stated in the General Description and RESET Output section (Page 8). Below 1 V, the output enters high-impedance state - hence a 100 kΩ pull-down resistor is recommended per Figure 11 to prevent floating logic levels in systems where VCC may decay to 0 V.

How does the manual reset (MR) input behave on ADM812ZARTZ-REEL7?

The MR input on ADM812ZARTZ-REEL7 is active-low and internally debounced. It rejects transients shorter than 100 ns and reliably detects pulses longer than 10 µs. Its logic thresholds scale with VCC: rising edge recognized above 0.7 × VCC and falling edge below 0.25 × VCC (for Z-suffix models), ensuring noise immunity across varying supply conditions.

Is ADM812ZARTZ-REEL7 RoHS compliant and what does the 'Z' suffix indicate?

Yes, ADM812ZARTZ-REEL7 is RoHS compliant, as indicated by the 'Z' in both the model number and ordering guide footnote stating "Z = RoHS Compliant Part". The 'Z' suffix also denotes the 2.32 V reset threshold variant within the ADM812 family and appears in the branding code 'M69' per the Ordering Guide (Page 10).