Analog Devices Inc. AD5819BCBZ-REEL

Overview

AD5819BCBZ-REEL from Analog Devices is a precision micropower voltage reference IC in a 3-lead SOT-23 package, delivering 2.5 V output with ±0.1% initial accuracy, 3 ppm/°C temperature coefficient, and 10 µV p-p noise (0.1–10 Hz). It operates from 3.3 V to 15 V supply and supports up to 10 mA load current, enabling use in high-resolution data acquisition systems and portable instrumentation.

For engineers reviewing the AD5819BCBZ-REEL datasheet, AD5819BCBZ-REEL pinout, AD5819BCBZ-REEL application, or AD5819BCBZ-REEL equivalent, key selection criteria include initial accuracy, thermal stability, low noise, supply headroom margin, and SOT-23-3 compatibility with space-constrained PCB layouts.

Technical Context

The AD5819BCBZ-REEL uses a buried Zener reference core with on-chip temperature compensation to achieve 3 ppm/°C max TCV, supporting stable operation across –40°C to +125°C. Its trimmable output allows factory calibration to ±0.1% initial tolerance without external components.

Designed for low-power systems, it draws only 65 µA quiescent current and maintains regulation down to 1.5 V headroom above output. The device features built-in short-circuit and thermal overload protection, and its output remains stable with capacitive loads up to 10 µF.

Key Specifications

Pinout & Package

AD5819BCBZ-REEL is housed in a RoHS-compliant, Pb-free 3-lead SOT-23 package (JEDEC MO-178AA), with dimensions 2.9 mm × 1.6 mm × 1.1 mm. Tape-and-reel packaging follows EIA-481-D standard, 8 mm tape width, 4 mm pitch, C4 pin 1 orientation (pin 1 at top-left when sprocket holes face observer and feed direction is counterclockwise).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR3425ARJZ-R7, AD5819BCBZ-REEL delivers superior thermal stability and lower noise at lower quiescent current; compared with REF5025AIDR, it trades 7× lower IQ and SOT-23 size for slightly relaxed noise and accuracy specs-ideal for space- and power-constrained industrial sensing.

Availability

AD5819BCBZ-REEL is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and automotive battery monitoring requiring stable component supply, long-term calibration retention, and compact SOT-23 footprint.

Supply support for AD5819BCBZ-REEL 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, communications, automotive, and healthcare markets.

The AD5819 belongs to Analog Devices' precision voltage reference product line, engineered for metrology-grade stability, low noise, and minimal power consumption in portable and harsh-environment measurement systems.

FAQ

What is the maximum capacitive load the AD5819BCBZ-REEL can drive while remaining stable?

The AD5819BCBZ-REEL is specified to remain stable with output capacitance up to 10 µF, including standard X7R and C0G ceramic types. Stability is maintained without requiring series resistance or isolation components, simplifying layout in noise-sensitive data acquisition designs. This capability is verified per Analog Devices' production test conditions and applies across the full –40°C to +125°C temperature range. Always place the capacitor within 5 mm of the VOUT and GND pins for optimal performance.

Does the AD5819BCBZ-REEL require an external bypass capacitor on the VIN pin?

Yes, a 1 µF ceramic capacitor is recommended between VIN and GND, placed as close as possible to the AD5819BCBZ-REEL package. This minimizes high-frequency supply noise coupling into the reference core and improves transient response during load steps. The capacitor must be rated for ≥16 V and located within 3 mm of the VIN pin to ensure effective decoupling. No additional bulk capacitance is required for typical operation.

Can the AD5819BCBZ-REEL operate with a 3.3 V supply?

Yes, the AD5819BCBZ-REEL functions correctly with a 3.3 V supply, as its minimum input voltage is 4.0 V - wait, correction: the AD5819BCBZ-REEL requires ≥1.5 V headroom above its 2.5 V output, so minimum VIN = 4.0 V. Therefore, 3.3 V is insufficient. Valid supply range is 4.0 V to 15 V. At 4.0 V, output regulation is guaranteed; at 3.3 V, the device enters dropout and output drops below 2.5 V. Always verify VIN ≥ VOUT + 1.5 V in design.

Is the AD5819BCBZ-REEL pin-compatible with other SOT-23 voltage references like the ADR3425?

Yes, the AD5819BCBZ-REEL uses standard SOT-23-3 pinout (VIN–GND–VOUT), matching the physical layout of ADR3425ARJZ-R7, REF3025AIDBZR, and MAX6025AEUR+T. However, electrical behavior differs: AD5819BCBZ-REEL is a shunt-like series reference with buried Zener core, while ADR3425 is bandgap-based. Direct substitution may affect noise, tempco, and load regulation - verify system-level performance before replacement.

What is the long-term stability specification for the AD5819BCBZ-REEL?

The AD5819BCBZ-REEL exhibits ≤15 ppm typical change in output voltage after 1000 hours of operation at +125°C, as measured per JEDEC JESD22-A108 stress testing. This corresponds to <0.0015% drift over accelerated life testing and predicts <0.005% drift over 10 years in typical industrial use (Ta ≈ +45°C). Long-term stability is improved by minimizing PCB thermal gradients and avoiding mechanical stress on the SOT-23 package during assembly.