Analog Devices Inc. ADM6339GARJZ-RL7

Overview

ADM6339GARJZ-RL7 from Analog Devices is a quad-voltage microprocessor supervisory circuit designed to monitor four independent supply rails-specifically configured for 5.0 V, 3.0 V, 1.8 V, and adjustable +1.23 V thresholds with ±10% 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 health monitoring.

For engineers reviewing the ADM6339GARJZ-RL7 datasheet, ADM6339GARJZ-RL7 pinout, ADM6339GARJZ-RL7 application, or ADM6339GARJZ-RL7 equivalent, key selection criteria include verified quad-rail threshold configuration (5.0 V / 3.0 V / 1.8 V / +1.23 V), SOT-23-6 package compatibility, guaranteed RESET validity down to IN1 or IN2 = 1 V, and factory-trimmed ±10% accuracy across temperature.

Technical Context

The ADM6339GARJZ-RL7 integrates four independent voltage comparators with internal resistor dividers preconfigured for 5.0 V, 3.0 V, and 1.8 V fixed thresholds and one +1.23 V adjustable input. Each comparator features 0.3% VTH hysteresis and glitch immunity up to 100 µs at 50 mV overdrive.

Its RESET output is open-drain with a 10 µA internal pull-up to IN2, remains valid as long as IN1 ≥ 1 V or IN2 ≥ 1 V, and asserts low when any monitored voltage falls below its threshold (or rises above for negative options). The device uses IN2 as its sole power source and requires no external biasing for standard operation.

Key Specifications

Pinout & Package

ADM6339GARJZ-RL7 is housed in a JEDEC-compliant 6-lead SOT-23 (RJ-6) package, 2.80–3.00 mm × 1.50–1.70 mm × 1.15–1.30 mm, with gull-wing leads and pin 1 indicator.

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, ADM6339GARJZ-RL7 uniquely supports the exact 5.0 V / 3.0 V / 1.8 V / +1.23 V configuration required for legacy 3.0 V-based telecom platforms, while integrating all four channels into one SOT-23-6 footprint and maintaining guaranteed RESET validity down to 1 V on either IN1 or IN2.

Availability

ADM6339GARJZ-RL7 is available at Aetrix Electronics and suitable for server power sequencing, telecom line card monitoring, and industrial PLC controller designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADM6339GARJZ-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 since 1965.

The ADM6339 family was developed to address the need for compact, low-power quad-supply supervision in space-constrained, multi-rail systems such as telecom infrastructure and enterprise servers-prioritizing accuracy, glitch immunity, and minimal external component count.

FAQ

What voltage thresholds does the ADM6339GARJZ-RL7 monitor?

The ADM6339GARJZ-RL7 monitors four specific voltage rails: IN1 at 5.0 V (±10%), IN2 at 3.0 V (±10%), IN3 at 1.8 V (±10%), and IN4 at an adjustable +1.23 V threshold. These values are factory-trimmed and documented in the Ordering Guide for ADM6339GARJZ-RL7. No reconfiguration or external resistors are needed for the fixed thresholds; the +1.23 V input supports custom scaling via external divider per Figure 15 in the datasheet.

Does the ADM6339GARJZ-RL7 require an external pull-up resistor on the RESET pin?

No, the ADM6339GARJZ-RL7 includes a 10 µA internal pull-up to IN2 on the open-drain RESET pin, eliminating the need for an external resistor in most cases where IN2 is ≥2.55 V. External pull-ups are only necessary when interfacing with logic supplies outside the IN2 range or when stronger drive capability is required. The internal pull-up ensures RESET remains functional even if IN2 drops to 1 V, as specified in the absolute maximum ratings.

What is the minimum operating voltage for the ADM6339GARJZ-RL7 to assert a valid RESET signal?

The ADM6339GARJZ-RL7 guarantees correct RESET state as long as either IN1 ≥ 1 V or IN2 ≥ 1 V, per Table 1 and General Description. This means the device continues to monitor and assert RESET even during brownout conditions where the 3.0 V rail (IN2) sags to 1 V-critical for fail-safe behavior in telecom and industrial systems. Below 1 V on both IN1 and IN2, RESET behavior is undefined.

Can unused inputs on the ADM6339GARJZ-RL7 be left floating?

No, unused inputs on the ADM6339GARJZ-RL7 must not float or be grounded. Per the General Description and Theory of Operation sections, unused IN3 or IN4 with positive thresholds should be tied to IN2; unused IN4 with negative thresholds must connect to a more negative supply. Floating inputs risk false resets due to leakage or noise coupling, and grounding violates the input voltage range specification (−0.3 V to +6 V for positive inputs).

How does the ADM6339GARJZ-RL7 handle voltage transients on monitored inputs?

The ADM6339GARJZ-RL7 incorporates built-in 0.3% VTH hysteresis and is rated for glitch immunity up to 100 µs duration at 50 mV overdrive, as shown in Figure 6. This allows it to reject short-duration supply noise without asserting spurious RESET. For enhanced immunity in noisy environments, Analog Devices recommends adding a 0.1 µF capacitor between IN2 and GND; similar capacitors may be added to other inputs per design requirements.