Analog Devices Inc. REF195GSZ

Overview

REF195GSZ from Analog Devices is a precision micropower low-dropout voltage reference IC delivering a stable 5.00 V output with ±2 mV initial accuracy, 5 ppm/°C max temperature coefficient, and 45 μA max supply current - used in high-accuracy ADC/DAC biasing, portable instrumentation, and solar-powered sensor nodes.

For engineers reviewing the REF195GSZ datasheet, REF195GSZ pinout, REF195GSZ application, or REF195GSZ equivalent, key selection criteria include dropout voltage (0.50 V @ 10 mA), sleep-mode current (15 μA), load regulation (4 ppm/mA), and SOIC_N package compatibility for space-constrained industrial designs.

Technical Context

The REF195GSZ implements a patented curvature-corrected band gap core with laser-trimmed thin-film resistors to achieve low drift and high initial accuracy across −40°C to +85°C. Its sleep mode is controlled via TTL/CMOS-compatible SLEEP pin (V_H = 2.4 V, V_L = 0.8 V), reducing supply current to ≤15 μA while disabling output.

It operates with input supply as low as 100 mV above output (5.10 V min at 10 mA load), supports 30 mA output current, and requires a 1 μF output bypass capacitor for stability. Short-circuit protection and 1.2 mV long-term drift (1000 h @ 125°C) ensure robustness in embedded systems.

Key Specifications

Pinout & Package

REF195GSZ is housed in an 8-lead SOIC_N (SOIC-8 narrow-body) package with exposed pad option not specified; pin 1 and pin 5 are factory test points (TP) and must remain unconnected per design.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR4550BRZ and MAX6126AASA50+, REF195GSZ uniquely balances 5 ppm/°C drift, 45 μA supply current, and active sleep control - making it the only choice for portable, solar, or loop-powered systems requiring both precision and micropower operation.

Availability

REF195GSZ is available at Aetrix Electronics and suitable for portable instrumentation, high-resolution data acquisition, and solar-powered sensor nodes requiring stable component supply with guaranteed long-term availability.

Supply support for REF195GSZ 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, headquartered in Norwood, MA.

The REF19x series was designed specifically for micropower, low-dropout precision voltage referencing in battery-constrained and thermally variable environments - targeting portable, industrial, and automotive sensing applications.

FAQ

What is the minimum supply voltage required for stable operation of the REF195GSZ?

The REF195GSZ requires a minimum supply voltage of 5.10 V at 10 mA load (0.50 V dropout), scaling linearly with output current. At no load, operation is stable down to 5.00 V + margin; however, datasheet specifies 5.10 V as the guaranteed minimum under 10 mA conditions. Always maintain ≥1 μF ceramic bypass capacitor from OUTPUT to GND to ensure stability across all supply voltages.

Does the REF195GSZ require external components for basic operation?

Yes - the REF195GSZ requires a minimum 1 μF ceramic capacitor connected between the OUTPUT and GND pins for stability and noise reduction, as explicitly mandated in the datasheet. No other passive components are required for standard operation, though layout best practices (short traces, ground plane, separation from noisy signals) are essential to achieve specified 5 ppm/°C temperature coefficient and 50 μV p-p noise performance.

How does the SLEEP pin function on the REF195GSZ, and what logic levels activate it?

The SLEEP pin on the REF195GSZ is an active-low TTL/CMOS-compatible control input: applying ≤0.8 V (logic low) disables the output and reduces supply current to ≤15 μA; applying ≥2.4 V (logic high) enables normal operation with ≤45 μA supply current. The pin draws ≤8 μA in either state, and no external pull-up or pull-down resistor is required - the internal structure supports direct microcontroller GPIO interfacing.

Can the REF195GSZ drive a 30 mA load while maintaining its specified accuracy?

Yes - the REF195GSZ is rated for continuous 30 mA output current with full specification compliance, including 4 ppm/mA load regulation and ±2 mV initial accuracy. However, at 30 mA, dropout voltage rises to 1.30 V (e.g., 6.30 V supply required), and thermal effects must be managed: PCB copper area and ambient temperature must stay within limits to avoid exceeding the −40°C to +85°C operating range where 5 ppm/°C TCVO is guaranteed.

Is the REF195GSZ suitable for automotive applications, and what temperature range is supported?

The REF195GSZ is specified over the extended industrial range of −40°C to +85°C, with typical performance validated to +125°C - making it suitable for under-hood automotive sensor modules and infotainment power domains where full AEC-Q100 qualification is not mandatory. While not officially AEC-Q100 qualified, its 125°C thermal characterization, 1.2 mV long-term drift (1000 h @ 125°C), and robust short-circuit protection support deployment in non-safety-critical automotive subsystems.