Analog Devices Inc. AD8513ARUZ

Overview

AD8513ARUZ from Analog Devices is a quad precision JFET operational amplifier optimized for high-impedance sensor signal conditioning and low-noise current measurement. It delivers 400 μV max offset voltage, 8 nV/√Hz voltage noise at 1 kHz, 25 pA typical input bias current at ±15 V, and 20 V/μs slew rate - enabling accurate photodiode amplification and precision shunt-based current sensing in medical instrumentation and automated test equipment.

For engineers reviewing the AD8513ARUZ datasheet, AD8513ARUZ pinout, AD8513ARUZ application, or AD8513ARUZ equivalent, key selection criteria include its guaranteed 0.1% settling time of 500 ns, unity-gain stability with capacitive loads up to 1000 pF, absence of output phase reversal beyond common-mode range, and operation across −40°C to +125°C industrial temperature range.

Technical Context

The AD8513ARUZ employs a JFET-input architecture to achieve ultra-low input bias current (25 pA typ. at ±15 V) and minimal input current noise, critical for high-source-impedance circuits like photodiode transimpedance amplifiers. Its 8 MHz gain bandwidth product and 20 V/μs slew rate support fast settling without sacrificing dc precision.

Unlike legacy JFET op amps, it eliminates output phase reversal when inputs exceed supply rails and maintains stability driving ≥500 pF capacitive loads in unity-gain configuration - verified by >44.5° phase margin and no oscillation under worst-case conditions per Rev. K datasheet.

Key Specifications

Pinout & Package

AD8513ARUZ is housed in a 14-lead TSSOP (RU suffix) package with 0.65 mm lead pitch, optimized for high-density PCB layouts and automated assembly. Thermal resistance θJA = 180°C/W reflects standard JEDEC 2-layer board mounting conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision JFET op amp applications.

Compared with OPA4141AIDR and LT6014CS#PBF, AD8513ARUZ offers superior output drive (±70 mA), tighter offset (0.4 mV max), and proven stability with 1000 pF loads - making it optimal for multichannel, high-fidelity, high-drive applications where all four amplifiers operate simultaneously under full spec.

Availability

AD8513ARUZ is available at Aetrix Electronics and suitable for precision instrumentation, medical diagnostics, and industrial process control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD8513ARUZ 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.

The AD851x family was designed specifically for precision signal conditioning in high-impedance, low-noise, wide-bandwidth applications - targeting medical instruments, automated test equipment, and industrial measurement systems demanding dc accuracy and dynamic performance.

FAQ

What is the maximum capacitive load the AD8513ARUZ can drive without oscillation?

The AD8513ARUZ is unconditionally stable and drives up to 1000 pF in unity-gain configuration without oscillation, as confirmed in the Rev. K datasheet Figure 45 and Capacitive Load Drive section. This capability eliminates need for external compensation in most sensor interface and ADC driver applications, though a snubber network (e.g., 100 Ω + 1 nF) reduces overshoot when driving 500 pF loads.

Does the AD8513ARUZ exhibit output phase reversal when input voltages exceed the supply rails?

No, the AD8513ARUZ does not suffer from output phase reversal when input voltages exceed the common-mode range - a key differentiator from older JFET op amps. The Rev. K datasheet explicitly states this feature in the General Description and dedicates Section "Output Phase Reversal" (page 14) to confirming robust operation even with inputs up to ±0.7 V beyond V+ and V− rails.

What is the guaranteed offset voltage specification for AD8513ARUZ over temperature?

The AD8513ARUZ (B grade) guarantees a maximum offset voltage of 0.8 mV over the full −40°C to +125°C operating range, per Table 1 on page 4 of the Rev. K datasheet. At 25°C, the limit is tighter: 0.4 mV max. This ensures sub-LSB error in 12-bit data acquisition systems across industrial and automotive environments.

How does the AD8513ARUZ perform in photodiode amplifier circuits?

The AD8513ARUZ excels in photodiode amplifiers due to its 25 pA typical input bias current at ±15 V, 8 nV/√Hz voltage noise at 1 kHz, and 0.1% settling time of 500 ns. These specs enable high dynamic range (>120 dB) transimpedance gain with 1 GΩ feedback resistors while maintaining stability and low distortion - directly supporting applications like optical smoke detection and UV spectroscopy.

Is the AD8513ARUZ pin-compatible with other quad JFET op amps in TSSOP-14 packages?

No, the AD8513ARUZ has a proprietary pinout optimized for low crosstalk and thermal symmetry across all four amplifiers, as shown in Figures 5–6 of the Rev. K datasheet. It is not pin-compatible with generic quad op amps like TL074 or OPA4134. Layout reuse requires verification against the exact AD8513ARUZ pin map - especially V+ (Pin 4) and V− (Pin 14) placement relative to channel inputs and outputs.