Analog Devices Inc. ADM6339BARJZ-RL7

Overview

ADM6339BARJZ-RL7 from Analog Devices is a quad-voltage microprocessor supervisory circuit in a 6-lead SOT-23 package, monitoring +5.0 V (±5%), +3.3 V (±5%), +2.5 V (±5%), and adjustable +1.23 V inputs with ±0.8% accuracy. It delivers active-low open-drain RESET with 200 ms typical timeout, operates from −40°C to +85°C, and draws only 55 μA, enabling reliable power-up sequencing in multi-rail embedded systems.

For engineers reviewing the ADM6339BARJZ-RL7 datasheet, ADM6339BARJZ-RL7 pinout, ADM6339BARJZ-RL7 application, or ADM6339BARJZ-RL7 equivalent, this page provides verified threshold tolerances, IN2-supplied operation, glitch-immune timing behavior, reset validity down to 1 V on IN1/IN2, and factory-trimmed voltage monitoring without external components.

Technical Context

The ADM6339BARJZ-RL7 uses internal resistor dividers and precision comparators to monitor four independent supply rails simultaneously, with each input featuring 0.3% threshold hysteresis for transient immunity. Its RESET output is powered by IN2 and remains valid as long as IN1 or IN2 exceeds 1 V - critical for brownout detection during partial power loss.

Thresholds are factory-trimmed: +5.0 V (−5% tolerance), +3.3 V (−5%), +2.5 V (−5%), and +1.23 V (±0.8%). The device requires no external capacitors for basic operation but supports noise filtering via optional 0.1 μF IN2-to-GND capacitance. All monitored inputs are referenced to GND, with no floating or grounded inputs permitted.

Key Specifications

Pinout & Package

ADM6339BARJZ-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, the ADM6339BARJZ-RL7 uniquely combines quad-rail monitoring, factory-trimmed ±5% thresholds on three rails, and a precision ±0.8% adjustable +1.23 V input - enabling single-chip supervision of heterogeneous supply architectures without external resistors or calibration.

Availability

ADM6339BARJZ-RL7 is available at Aetrix Electronics and suitable for telecommunications infrastructure, industrial PLC controllers, and network-attached storage systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADM6339BARJZ-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.

The ADM6339 series was designed specifically for multi-rail microprocessor systems requiring accurate, low-power, and glitch-immune power-supply supervision across diverse voltage domains - targeting telecom, industrial, and medical embedded platforms.

FAQ

What is the exact threshold voltage and tolerance for each input on the ADM6339BARJZ-RL7?

The ADM6339BARJZ-RL7 has factory-set thresholds: IN1 = +5.0 V (−5% tolerance, 4.50 V to 4.75 V), IN2 = +3.3 V (−5%, 2.85 V to 3.00 V), IN3 = +2.5 V (−5%, 2.13 V to 2.25 V), and IN4 = adjustable +1.23 V (±0.8%, 1.20 V to 1.26 V). These values are confirmed in Table 1 of the Rev. A datasheet and apply specifically to the BARJZ-RL7 variant.

Does the ADM6339BARJZ-RL7 require an external pull-up resistor on the RESET pin?

No, the ADM6339BARJZ-RL7 includes a 10 μA internal pull-up to IN2, making an external pull-up unnecessary in most cases where RESET interfaces with logic referenced to the same IN2 supply. External pull-ups are only needed when interfacing with higher-voltage logic domains, and even then, the internal circuitry prevents reverse current flow into IN2.

Can unused inputs on the ADM6339BARJZ-RL7 be left floating or tied to ground?

No - unused inputs on the ADM6339BARJZ-RL7 must not float or be grounded. Per the datasheet's "Input Configuration" section, unused positive-threshold inputs (e.g., IN3 or IN4 when set to +1.23 V) should connect directly to IN2; unused negative-threshold configurations are not applicable to the BARJZ-RL7 variant. Floating or grounded inputs risk false resets or undefined behavior.

What is the minimum supply voltage required for the ADM6339BARJZ-RL7 to maintain valid RESET output state?

The ADM6339BARJZ-RL7 guarantees correct RESET output state as long as either IN1 or IN2 remains ≥ 1 V - explicitly stated in the General Description and Table 1 footnote. This allows reliable brownout detection even when one rail collapses while another remains partially active, a key feature for fault-tolerant system design.

How does the ADM6339BARJZ-RL7 handle short-duration voltage glitches on monitored inputs?

The ADM6339BARJZ-RL7 incorporates 0.3% threshold hysteresis and is characterized for glitch immunity up to 900 μs at 10 mV overdrive (Figure 6). Its internal comparators reject transients shorter than this duration, preventing spurious resets. For enhanced noise immunity in electrically noisy environments, a 0.1 μF capacitor between IN2 and GND is recommended.