Analog Devices Inc. ADM6339OARJZ-RL7

Overview

ADM6339OARJZ-RL7 from Analog Devices is a quad-voltage microprocessor supervisory circuit designed to monitor +5.0 V, +3.3 V, adjustable +1.23 V, and −5.0 V supply rails with ±10% threshold tolerance. It delivers active-low open-drain RESET output with 200 ms typical timeout, operates from −40°C to +85°C, and draws only 55 μA quiescent current. It is used in telecom and server power sequencing to ensure reliable system boot and brownout recovery.

For engineers reviewing the ADM6339OARJZ-RL7 datasheet, ADM6339OARJZ-RL7 pinout, ADM6339OARJZ-RL7 application, or ADM6339OARJZ-RL7 equivalent, key selection criteria include verified −5.0 V monitoring capability, factory-trimmed thresholds for +5.0 V/+3.3 V inputs, adjustable +1.23 V input configuration, guaranteed RESET validity down to IN1 or IN2 = 1 V, and SOT-23 package compatibility with space-constrained embedded designs.

Technical Context

The ADM6339OARJZ-RL7 integrates four independent voltage comparators with internal hysteresis (0.3% V_TH) and a 200 ms reset timeout timer. Its IN2 pin serves as both monitored voltage and internal power supply, enabling operation down to 1.0 V while maintaining RESET output integrity.

It supports mixed-sign monitoring: +5.0 V and +3.3 V fixed thresholds (±10%), +1.23 V adjustable threshold (±2.0% accuracy), and −5.0 V negative rail monitoring with +5% tolerance on rising edge. The open-drain RESET output features a 10 μA internal pull-up to IN2 and sinks up to 2 mA at 0.4 V.

Key Specifications

Pinout & Package

ADM6339OARJZ-RL7 is housed in a 6-lead SOT-23 (RJ-6) package per JEDEC MO-178-AB, with 1.90 mm × 2.90 mm footprint and 1.30 mm height - suitable for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-voltage supervisory applications.

Compared with MAX6339EUT+T and TPS3808G33DBVR, ADM6339OARJZ-RL7 uniquely combines −5.0 V rail supervision with three positive rails in one SOT-23 package, eliminating external components needed for negative voltage detection and reducing total system footprint by >75% versus discrete solutions.

Availability

ADM6339OARJZ-RL7 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial servers, and data storage controllers requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.

Supply support for ADM6339OARJZ-RL7 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 leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.

The ADM6339 product line delivers compact, low-power supervisory circuits for multi-rail microprocessor systems - engineered to simplify power sequencing and improve system reliability in telecom, computing, and industrial equipment.

FAQ

What voltage rails does the ADM6339OARJZ-RL7 monitor?

The ADM6339OARJZ-RL7 monitors four specific rails: +5.0 V (IN1), +3.3 V (IN2), an adjustable +1.23 V input (IN3) configured via external resistor divider, and −5.0 V (IN4). Its ordering code "O" explicitly denotes this configuration, and the −5.0 V input triggers RESET when voltage rises above −4.50 V (−10% tolerance), per the device's bipolar threshold architecture.

Does ADM6339OARJZ-RL7 require an external pull-up resistor on the RESET pin?

No, ADM6339OARJZ-RL7 includes a 10 μA internal pull-up to IN2, eliminating the need for an external resistor in most interfacing scenarios. An external pull-up is only required if driving logic referenced to a voltage other than IN2 - in which case the internal pull-up is overdriven, and reverse current flow is blocked by internal protection circuitry.

How does the ADM6339OARJZ-RL7 handle negative voltage monitoring?

The ADM6339OARJZ-RL7 uses polarity-inverted logic for IN4: RESET asserts when the −5.0 V rail rises above its upper threshold (e.g., −4.50 V for −10% tolerance), detecting overvoltage or loss of negative bias. This behavior is documented in the General Description and confirmed in Table 1's "VINx Increasing" column for −5.0 V thresholds.

What is the minimum operating voltage for ADM6339OARJZ-RL7 to maintain valid RESET output?

ADM6339OARJZ-RL7 guarantees correct RESET state as long as either IN1 or IN2 exceeds 1.0 V - a critical feature for brownout recovery in systems where auxiliary rails remain active longer than main supplies. This specification is explicitly stated in the General Description and Table 1 footnote #2.

Can unused inputs on ADM6339OARJZ-RL7 be left floating?

No - unused inputs must not float or be grounded. For ADM6339OARJZ-RL7, IN3 is configured as +1.23 V adjustable and must be connected via resistor divider; IN4 is actively used for −5.0 V. If any input were unused (e.g., in other variants), it would require connection to a supply > its threshold - grounding or floating risks false RESET assertion due to comparator instability.