Analog Devices Inc. RN5VD39AA-TR-FE

Overview

RN5VD39AA-TR-FE from Nisshinbo Micro Devices is a low-voltage detector IC with fixed 3.9V detection threshold, N-channel open-drain output, and integrated output delay circuit. It operates from 0.7V to 10.0V supply, draws only 1.2µA typical supply current at VDD=3.8V, and delivers ±2.5% detector threshold accuracy over temperature - used for CPU reset, battery backup supervision, and power failure detection in embedded systems.

For engineers reviewing the RN5VD39AA-TR-FE datasheet, RN5VD39AA-TR-FE pinout, RN5VD39AA-TR-FE application, or RN5VD39AA-TR-FE equivalent, key selection criteria include its 3.9V detection voltage, 100ms typical delay via external 0.15µF capacitor, SOT-23-5 package, ultra-low quiescent current, and guaranteed operation down to 0.7V input voltage.

Technical Context

The RN5VD39AA-TR-FE implements a precision comparator with internal resistor network and voltage reference to achieve fixed –VDET = 3.900V (±2.5%) and hysteresis of 0.117V (typ). Its output delay is generated by charging an external capacitor at the CD pin through an internal 1.0MΩ delay resistance (0.5–2.0MΩ range), yielding tD = 0.69 × RD × CD.

It features dual-stage detection logic: output goes low ("L") when VDD falls below –VDET (3.9V), and returns high after delay once VDD rises above +VDET (3.9V + VHYS ≈ 4.017V). The NC pin (Pin 4) is unconnected; CD pin (Pin 5) must be externally decoupled to set delay timing.

Key Specifications

Pinout & Package

Package: SOT-23-5 - surface-mount, 2.9mm × 1.6mm footprint enabling high-density PCB layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detector applications.

Compared with TLV809K39DBZR and APX803S-39SA-7, the RN5VD39AA-TR-FE uniquely combines adjustable delay (via CD pin), guaranteed ±2.5% threshold accuracy, and explicit hysteresis spec - making it optimal for designs requiring precise, field-tunable reset behavior without external components.

Availability

RN5VD39AA-TR-FE is available at Aetrix Electronics and suitable for CPU reset, battery backup supervision, and power failure detection requiring stable component supply across industrial, medical, and IoT device production cycles.

Supply support for RN5VD39AA-TR-FE 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

Nisshinbo Micro Devices is a Japanese semiconductor company specializing in precision analog ICs including voltage detectors, reset ICs, LDOs, and battery management solutions.

The RN5VD series is designed specifically for ultra-low-power system supervision - delivering high-accuracy detection, programmable delay, and robust operation from sub-1V to 10V rails in compact SOT-23-5 packages.

FAQ

What is the exact detection threshold voltage of the RN5VD39AA-TR-FE?

The RN5VD39AA-TR-FE has a nominal detection threshold of –VDET = 3.900V, with guaranteed tolerance of ±2.5% (3.803V to 3.997V) across temperature and process variation. This value is factory-trimmed and does not require external calibration. The released voltage (+VDET) is approximately 4.017V due to 0.117V typical hysteresis. These values are specified in the Electrical Characteristics table for RN5VD39A/C on page 10 of the official datasheet.

How do I configure the output delay for RN5VD39AA-TR-FE?

To configure the output delay for RN5VD39AA-TR-FE, connect a capacitor (CD) between Pin 5 (CD) and GND. Delay time follows tD = 0.69 × RD × CD, where RD is the internal delay resistance (1.0MΩ typ). For a 100ms delay, use CD = 0.15µF. The CD pin threshold voltage (VTCD) is 2.376V (typ) at VDD = 5.94V. Avoid placing resistors or other loads on the CD pin to preserve timing accuracy.

Can RN5VD39AA-TR-FE operate from a 1.8V supply?

Yes, RN5VD39AA-TR-FE can operate from a 1.8V supply - its specified operating voltage range is 0.7V to 10.0V. At 1.8V, the device remains functional but will not assert detection (since 1.8V < 3.9V threshold); it continues drawing only ~1.0µA supply current. Detection occurs only when VDD rises above +VDET (~4.017V) or falls below –VDET (3.900V). Operation below threshold is valid and supported per Absolute Maximum Ratings.

What is the purpose of the NC pin (Pin 4) on RN5VD39AA-TR-FE?

Pin 4 of the RN5VD39AA-TR-FE is designated NC (No Connection) and is internally unconnected. It must remain electrically floating - no PCB trace, solder mask opening, or component should contact this pad. Routing signals or applying voltage to Pin 4 may cause unpredictable behavior or damage. The SOT-23-5 package uses this pin solely for mechanical symmetry and thermal relief; all functional terminals are on Pins 1–3 and 5.

Does RN5VD39AA-TR-FE support both Nch open-drain and CMOS outputs?

No, RN5VD39AA-TR-FE supports only N-channel open-drain output, as indicated by the "A" suffix in its part number (per Selection Guide: "A" = Nch Open Drain, "C" = CMOS). The "RN5VD39AA" variant requires an external pull-up resistor on the OUT pin (Pin 1) to define the high-level voltage. A CMOS-output version would be labeled RN5VD39AC-TR-FE and does not share identical pinout or drive characteristics.