Analog Devices Inc. ADM6339AARJZ-RL7

Overview

ADM6339AARJZ-RL7 from Analog Devices is a quad-voltage microprocessor supervisory circuit that monitors +5.0 V, +3.3 V, +2.5 V, and an adjustable +1.23 V supply 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 server power sequencing and telecom system reset management.

For engineers reviewing the ADM6339AARJZ-RL7 datasheet, ADM6339AARJZ-RL7 pinout, ADM6339AARJZ-RL7 application, or ADM6339AARJZ-RL7 equivalent, key selection criteria include quad-supply monitoring capability, factory-trimmed thresholds for 5.0 V/3.3 V/2.5 V rails, adjustable 1.23 V input, guaranteed RESET validity down to IN1 or IN2 = 1 V, and SOT-23-6 packaging for space-constrained embedded systems.

Technical Context

The ADM6339AARJZ-RL7 integrates four independent voltage comparators with internal resistor dividers for fixed thresholds (+5.0 V, +3.3 V, +2.5 V) and one adjustable +1.23 V reference input. Each comparator includes 0.3% VTH hysteresis for glitch immunity and supports undervoltage detection with precise timing control.

Its RESET output is open-drain with a 10 μA internal pull-up to IN2, remains valid as long as IN1 or IN2 ≥ 1 V, and asserts low when any monitored voltage falls below its threshold (or rises above for negative options-though not applicable here). The device uses IN2 as its sole power supply and requires no external biasing for standard operation.

Key Specifications

Pinout & Package

ADM6339AARJZ-RL7 is housed in a RoHS-compliant 6-lead SOT-23 package (JEDEC MO-178-AB, package option RJ-6), measuring 2.90 mm × 1.60 mm × 1.15 mm, 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, the ADM6339AARJZ-RL7 uniquely combines factory-trimmed 5.0 V/3.3 V/2.5 V monitoring with a precision adjustable +1.23 V input in a single SOT-23-6 package - enabling compact, accurate supervision of heterogeneous voltage domains without external calibration or multiple ICs.

Availability

ADM6339AARJZ-RL7 is available at Aetrix Electronics and suitable for server power sequencing, telecom line card reset, and industrial PLC controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for ADM6339AARJZ-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 family was designed for microprocessor-based systems requiring reliable, low-power, multi-rail voltage supervision - targeting telecom infrastructure, enterprise computing, and industrial automation where deterministic reset behavior is critical.

FAQ

What voltage rails does the ADM6339AARJZ-RL7 monitor?

The ADM6339AARJZ-RL7 monitors four distinct supply rails: IN1 at +5.0 V (±10% tolerance), IN2 at +3.3 V (±10%), IN3 at +2.5 V (±10%), and IN4 as an adjustable +1.23 V (±2.0%) input. IN2 also serves as the device's internal power supply, making it mandatory for operation. This configuration is explicitly defined in the Ordering Guide for ADM6339AARJZ-RL7 and confirmed across the General Description and Specifications sections.

Does the ADM6339AARJZ-RL7 require an external pull-up resistor on the RESET pin?

No, the ADM6339AARJZ-RL7 includes a 10 μA internal pull-up to IN2 on the open-drain RESET output, eliminating the need for an external pull-up in most 3.3 V logic interfacing scenarios. External pull-ups are only necessary when interfacing with logic supplies outside the IN2 voltage range (e.g., 5 V or 1.8 V), and even then, internal circuitry prevents reverse current flow into IN2. This behavior is specified in the RESET Output Configuration section and verified in Figure 17 of the datasheet.

What is the minimum operating voltage for the ADM6339AARJZ-RL7 to maintain valid RESET output?

The ADM6339AARJZ-RL7 guarantees valid RESET output state as long as either IN1 or IN2 remains ≥ 1 V - a feature explicitly stated in the General Description and reinforced in Table 1's footnote 2. This enables brown-out detection and controlled shutdown during partial power loss, distinguishing it from supervisors requiring full nominal supply for RESET integrity.

How does the ADM6339AARJZ-RL7 handle noise or short transients on monitored inputs?

The ADM6339AARJZ-RL7 incorporates 0.3% VTH hysteresis on all comparators (0.47% for IN4 in Q-model variants, not applicable here) and demonstrates immunity to transients under 100 ns per Figure 6. Its input structure resists glitches without compromising threshold accuracy, and adding a 0.1 μF capacitor from IN2 to GND further enhances noise immunity - details confirmed in the Input Configuration and Theory of Operation sections.

Is the ADM6339AARJZ-RL7 compatible with negative voltage monitoring?

No, the ADM6339AARJZ-RL7 variant is configured for +5.0 V, +3.3 V, +2.5 V, and +1.23 V monitoring only. Negative voltage supervision (e.g., −5.0 V or −0.5 V) is supported in other ordering options like ADM6339MARJZ-RL7 or ADM6339QARJZ-RL7, but not in ADM6339AARJZ-RL7. The Ordering Guide clearly assigns IN4 as "Adj (1.23)" for this part, and no negative threshold functionality is described for this specific model.