Analog Devices Inc. ADM6339IARJZ-RL7

Overview

ADM6339IARJZ-RL7 from Analog Devices is a quad-voltage microprocessor supervisory circuit that monitors +5.0 V, +3.3 V, +2.5 V, and +1.8 V supply rails with ±10% threshold tolerance. It features an open-drain active-low 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 health monitoring.

For engineers reviewing the ADM6339IARJZ-RL7 datasheet, ADM6339IARJZ-RL7 pinout, ADM6339IARJZ-RL7 application, or ADM6339IARJZ-RL7 equivalent, key selection criteria include fixed four-rail monitoring capability, SOT-23-6 package compatibility, guaranteed RESET validity down to IN1 or IN2 = 1 V, and factory-trimmed thresholds eliminating external resistor networks.

Technical Context

The ADM6339IARJZ-RL7 integrates four independent voltage comparators with internal precision reference and hysteresis (0.3% V_TH). Each input is preconfigured for specific nominal voltages: IN1 = +5.0 V, IN2 = +3.3 V (also powers the device), IN3 = +2.5 V, IN4 = +1.8 V - all with ±10% tolerance. No user adjustment is required for these thresholds.

Its RESET output is open-drain with a weak 10 μA internal pull-up to IN2, remains valid as long as IN1 or IN2 ≥ 1 V, and asserts low when any monitored rail falls below its threshold. After recovery, RESET stays low for 200 ms (140–280 ms min–max) before releasing.

Key Specifications

Pinout & Package

ADM6339IARJZ-RL7 is housed in a 6-lead SOT-23 (RJ-6) package per JEDEC MO-178-AB, with 1.90 mm × 2.95 mm footprint and 1.30 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3307-33D and MAX6812HUT+T, the ADM6339IARJZ-RL7 delivers verified quad-rail supervision in one SOT-23-6 package with zero external components - reducing layout complexity, qualification risk, and total system cost for multi-supply embedded systems.

Availability

ADM6339IARJZ-RL7 is available at Aetrix Electronics and suitable for server power sequencing, telecom line card monitoring, and industrial PLC backplane applications requiring stable component supply and long-term lifecycle support.

Supply support for ADM6339IARJZ-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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The ADM6339 product line delivers compact, low-power, multi-rail voltage supervisors designed specifically for reliable power-good monitoring in space-constrained microprocessor systems.

FAQ

What is the exact threshold voltage for each input on the ADM6339IARJZ-RL7?

The ADM6339IARJZ-RL7 has factory-trimmed thresholds: IN1 = +5.0 V (−10% tolerance → 4.25 V to 4.50 V), IN2 = +3.3 V (−10% → 2.85 V to 3.00 V), IN3 = +2.5 V (−10% → 2.13 V to 2.25 V), and IN4 = +1.8 V (−10% → 1.53 V to 1.62 V). These values are specified in Table 1 of the Rev. A datasheet and require no external calibration.

Does the ADM6339IARJZ-RL7 require external pull-up resistors on the RESET pin?

No, the ADM6339IARJZ-RL7 includes a 10 μA internal pull-up to IN2, making external pull-up resistors unnecessary in most cases. An external pull-up may be added only if interfacing with a logic supply voltage outside the 1.0 V to 5.5 V range of IN2 - but the internal circuitry prevents reverse current flow into IN2.

Can unused inputs on the ADM6339IARJZ-RL7 be left floating?

No - unused inputs must not float or be grounded. For positive-threshold inputs like those on the ADM6339IARJZ-RL7, unused pins should be tied to IN2 (the +3.3 V supply). Floating inputs risk false resets due to noise coupling or comparator instability.

What is the minimum operating voltage for the ADM6339IARJZ-RL7 to maintain valid RESET output?

The ADM6339IARJZ-RL7 guarantees RESET output validity as long as either IN1 or IN2 remains ≥ 1 V. This allows the device to assert or hold RESET even during severe brownout conditions where other rails collapse - a critical feature for fail-safe system recovery.

How does the ADM6339IARJZ-RL7 handle transient glitches on monitored supply lines?

The ADM6339IARJZ-RL7 incorporates 0.3% V_TH hysteresis on each comparator and is characterized for glitch immunity up to 900 µs at 10 mV overdrive (Figure 6). This built-in hysteresis rejects short-duration supply noise without requiring external RC filtering in most applications.