Analog Devices Inc. AD8031ARZ-REEL7

Overview

AD8031ARZ-REEL7 from Analog Devices is a single-channel, rail-to-rail input/output voltage feedback operational amplifier optimized for high-speed, low-power applications. It delivers 80 MHz −3 dB bandwidth (G = +1), 30 V/μs slew rate, and 125 ns settling time to 0.1% while consuming only 800 μA quiescent current per amplifier at +5 V supply. It operates from +2.7 V to +12 V (or ±1.35 V to ±6 V), with output swing within 20 mV of either rail under light load - ideal for buffering high-speed ADCs in portable instrumentation.

For engineers reviewing the AD8031ARZ-REEL7 datasheet, AD8031ARZ-REEL7 pinout, AD8031ARZ-REEL7 application, or AD8031ARZ-REEL7 equivalent, key selection considerations include its rail-to-rail I/O capability at low supply voltage, distortion performance (−62 dBc @ 1 MHz, 2 V_p-p), capacitive load drive limit (15 pF), and industrial temperature range (−40°C to +85°C).

Technical Context

The AD8031ARZ-REEL7 employs a proprietary eXtra Fast Complementary Bipolar (XFCB) process enabling 80 MHz bandwidth and 30 V/μs slew rate at just 800 μA supply current. Its input stage dynamically switches between PNP and NPN differential pairs to extend common-mode range beyond rails by 200 mV and prevent phase reversal up to 500 mV beyond supplies.

The rail-to-rail output stage uses common-emitter transistors with ~25 Ω effective collector resistance, delivering 15 mA output current and enabling output swing to within 20 mV of either rail at light loads. Open-loop gain remains stable within 250 mV of V_CC and 150 mV of V_EE, then decreases linearly as output transistors saturate.

Key Specifications

Pinout & Package

AD8031ARZ-REEL7 is housed in an 8-lead SOIC_N (R) package with exposed pad (RoHS-compliant, lead-free). Pin 1 is NC (no connect); pins 2–4 and 6–8 are functional; pin 5 is NC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, low-power op-amp applications.

Compared with OPA355IDBVR and ADA4891-1ARJZ-R7, AD8031ARZ-REEL7 offers the lowest quiescent current (800 μA) among 80+ MHz amplifiers in SOIC packages, making it optimal for energy-constrained applications where 80 MHz bandwidth suffices and capacitive load is ≤15 pF.

Availability

AD8031ARZ-REEL7 is available at Aetrix Electronics and suitable for portable test instruments, A/D buffers, and active filters requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for AD8031ARZ-REEL7 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 AD8031 is part of Analog Devices' high-speed, low-power op-amp product line designed specifically for single-supply, battery-operated, and space-constrained systems demanding wide bandwidth without excessive power consumption.

FAQ

What is the maximum supply voltage for AD8031ARZ-REEL7?

The AD8031ARZ-REEL7 supports a maximum single-supply voltage of 12.6 V absolute rating, with recommended operating range up to +12 V. For dual-supply operation, it accepts ±6 V maximum, corresponding to ±1.35 V to ±6 V specified operating range. Exceeding these limits risks permanent damage per Absolute Maximum Ratings Table 4.

Does AD8031ARZ-REEL7 support true rail-to-rail input with overvoltage tolerance?

Yes. AD8031ARZ-REEL7 features rail-to-rail input with common-mode range extending 200 mV beyond both supply rails (e.g., −0.2 V to +5.2 V on +5 V supply), and it tolerates inputs up to 500 mV beyond rails without phase reversal. This is enabled by its dual-input-stage architecture switching between PNP and NPN pairs.

Can AD8031ARZ-REEL7 drive a 1000 pF capacitive load?

No. AD8031ARZ-REEL7 is characterized for stable operation with ≤15 pF capacitive load at G = +2 (per Figure 46 and Table 1–3). Driving 1000 pF directly causes severe peaking and potential oscillation. A series resistor (e.g., 20–50 Ω) between AD8031ARZ-REEL7 output and the load is mandatory for stability.

What is the typical input offset voltage for AD8031ARZ-REEL7?

The AD8031ARZ-REEL7 is offered in two grades: AD8031A (±0.5 mV max at 25°C) and AD8031B (±1.5 mV max at 25°C). The "ARZ" suffix denotes the SOIC_N package and corresponds to the AD8031A grade, so typical V_OS is ±0.5 mV max at room temperature, with ±1.6 mV max over −40°C to +85°C.

Is AD8031ARZ-REEL7 suitable for driving ADC inputs with 10 pF capacitance?

Yes. AD8031ARZ-REEL7 is fully characterized for driving 10 pF capacitive loads (see Settling Time specification: 125 ns to 0.1% with CL = 10 pF). Its 30 V/μs slew rate and rail-to-rail output ensure fast, accurate settling into typical SAR ADC input networks, provided layout minimizes stray capacitance and uses local decoupling.