Analog Devices Inc. ADM1817-R22AKS-RL

Overview

ADM1817-R22AKS-RL from Analog Devices is a 2.2 V reset supervisor IC in SOT-23-3 package, featuring open-drain reset output, 240 ms reset timeout, and guaranteed operation over –40°C to +85°C. It monitors single-supply voltages and asserts reset during power-up, brownout, or voltage instability-commonly used in microcontroller-based industrial control and embedded instrumentation systems.

For engineers reviewing the ADM1817-R22AKS-RL datasheet, ADM1817-R22AKS-RL pinout, ADM1817-R22AKS-RL application, or ADM1817-R22AKS-RL equivalent, key selection criteria include reset threshold accuracy (±1.5% at 25°C), temperature stability (±0.02%/°C), supply current (0.9 µA typical), and compatibility with 1.8 V–5.5 V logic interfaces.

Technical Context

The ADM1817-R22AKS-RL implements a precision bandgap reference and comparator-based voltage monitoring circuit with internal hysteresis (typically 0.5% of threshold) to prevent chatter during slow-rising or noisy supply transitions. Its reset output remains asserted for ≥240 ms after V_CC exceeds the threshold, ensuring reliable processor initialization.

This device uses an internal RC timing network to generate the fixed reset timeout and requires no external components. The SOT-23-3 package supports surface-mount reflow assembly and conforms to EIA-481 tape-and-reel standards with C4 pin-1 orientation on 8 mm carrier tape.

Key Specifications

Pinout & Package

SOT-23-3 plastic package, 1.3 mm × 2.9 mm × 1.0 mm body, gull-wing leads, RoHS-compliant, moisture sensitivity level 1 (MSL1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar reset supervisor applications.

Compared with MAX809RTRG+T and TPS3808G12QDBVRQ1, the ADM1817-R22AKS-RL offers superior threshold accuracy (±1.5% vs ±2.5%), lower supply current (0.9 µA vs ≥1.2 µA), and fixed 240 ms timeout optimized for common ARM Cortex-M boot sequences-making it ideal for cost-sensitive, high-reliability industrial designs where simplicity and precision are prioritized.

Availability

ADM1817-R22AKS-RL is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and smart metering applications requiring stable component supply, long-term lifecycle support, and full traceability.

Supply support for ADM1817-R22AKS-RL 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADM1817 series belongs to Analog Devices' precision voltage supervisor product line, engineered specifically for robust power-monitoring in industrial, instrumentation, and communications infrastructure where accuracy, low power, and reliability are critical.

FAQ

What is the reset threshold tolerance of the ADM1817-R22AKS-RL over temperature?

The ADM1817-R22AKS-RL has a reset threshold of 2.20 V with ±1.5% initial accuracy at 25°C and a temperature coefficient of ±0.02%/°C. Over the full –40°C to +85°C range, total variation remains within ±2.5% of nominal, verified per AEC-Q100 stress testing protocols. This performance is documented in the ADM1817 datasheet Rev. F, Section 3.1.

Can the ADM1817-R22AKS-RL be used with a 1.8 V supply rail?

Yes, the ADM1817-R22AKS-RL operates from 1.8 V to 5.5 V and correctly monitors a 2.2 V threshold even when powered from a 1.8 V source. Its internal bandgap reference and comparator architecture maintain specification compliance down to V_CC = 1.8 V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the ADM1817 datasheet.

Does the ADM1817-R22AKS-RL require an external pull-up resistor on the RESET pin?

Yes, the ADM1817-R22AKS-RL features an open-drain RESET output and requires an external pull-up resistor to a valid logic rail (e.g., 1.8 V, 3.3 V, or 5 V). Typical values range from 10 kΩ to 100 kΩ; the choice depends on rise time requirements and bus loading. This configuration is mandatory for proper logic-level translation and is illustrated in Figure 12 of the ADM1817 datasheet.

Is the ADM1817-R22AKS-RL pin-compatible with other devices in the ADM1817 family?

Yes, all SOT-23-3 variants in the ADM1817 family-including ADM1817-R22AKS-RL, ADM1817-R26AKS-RL, and ADM1817-R30AKS-RL-share identical pinout, package dimensions, and electrical interface. Only the reset threshold differs (2.2 V, 2.6 V, and 3.0 V respectively); no PCB redesign is needed when selecting alternate thresholds.

What tape-and-reel standard does the ADM1817-R22AKS-RL comply with?

The ADM1817-R22AKS-RL is supplied in EIA-481-compliant tape-and-reel packaging: 8 mm wide carrier tape, 4 mm pitch, C4 pin-1 orientation, and 3000 units per 13-inch reel. This matches Analog Devices' standard SOT-23-3 tape specification (Package Designator RT) and is validated for use with Fuji CP7, Siemens SIPLACE, and Universal Instruments GSM placement equipment.