AD8615ARZ - Precision 20MHz CMOS RRIO Op Amp | Analog Devices
MPN: AD8615ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.35 | $2.35 |
| 10 | $2.11 | $21.10 |
| 100 | $1.88 | $188.00 |
| 500 | $1.69 | $845.00 |
| 1,000 | $1.52 | $1,520.00 |
AD8615ARZ Overview
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output. It is a fundamental building block in analog electronics, used in signal conditioning, filtering, and instrumentation. The AD8615 belongs to the family of rail-to-rail input/output amplifiers, which allow the input and output to swing close to the supply rails, maximizing dynamic range in low-voltage single-supply systems. This makes it ideal for battery-powered and portable equipment.
Key features of the AD8615ARZ include a patented trimming technique that achieves superior precision without laser trimming, ensuring low offset voltage and drift. The wide bandwidth of 20 MHz and slew rate of 12 V/µs support high-speed signal processing. The low input bias current of 1 pA is critical for high-impedance sensor interfaces, such as photodiode amplifiers. The device also exhibits no phase reversal, maintaining stability even when inputs exceed the common-mode range.
Technically, the AD8615 uses a CMOS process that provides low power consumption (2 mA supply current) while delivering high performance. The rail-to-rail output stage can source and sink 150 mA, enabling direct drive of heavy loads. The amplifier is fully specified for 5 V single-supply operation, but also supports 2.7 V to 5.5 V, making it versatile for various supply rails. The combination of low noise, low bias current, and wide bandwidth makes it suitable for precision data acquisition and sensor conditioning.
Typical applications include photodiode amplifiers, high-impedance sensor interfaces, active filters, integrators, and portable instrumentation. The AD8615ARZ is also used in battery-powered devices where low power and rail-to-rail operation are essential. Its high output current allows it to drive ADCs directly or buffer reference voltages.
When designing with the AD8615ARZ, ensure proper decoupling of the power supply pins with 0.1 µF ceramic capacitors placed close to the device. For optimal noise performance, use low-value resistors in the feedback network and keep the input traces short. The device is available in an 8-lead SOIC package (ARZ suffix) and is RoHS compliant.
Drop-in alternatives for AD8615ARZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD8615ARZ (same form factor and footprint) — differing in Amplifier Type, Gain Bandwidth Product, Package, Input Bias Current, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD8616ARZ
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →AD8515ARZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.28 / Unit
View Datasheet →AD8605ARZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.79 / Unit
View Datasheet →OPA340UA
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MCP6281-E/SN
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD8615ARZ Maximum Ratings & Electrical Characteristics
| Amplifier Type | Operational Amplifier |
| Number of Channels | 1 |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Offset Voltage (max) | 65 µV |
| Input Bias Current | 1 pA |
| Voltage Noise Density | 8 nV/√Hz |
| Bandwidth | 20 MHz |
| Slew Rate | 12 V/µs |
| Output Current | 150 mA |
| Supply Current | 2 mA |
| Rail-to-Rail Input/Output | Yes |
| Unity-Gain Stable | Yes |
| No Phase Reversal | Yes |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-Lead SOIC (ARZ) |
| RoHS Compliant | Yes |
AD8615ARZ Pin Configuration
| Pin 1 | OUT — Amplifier output |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply (ground in single-supply) |
| Pin 5 | NC — No connect |
| Pin 6 | NC — No connect |
| Pin 7 | NC — No connect |
| Pin 8 | V+ — Positive supply |
Typical Applications
AD8615ARZ is suitable for 6 applications: Photodiode Amplifier, Portable Instrumentation, Active Filters, Sensor Signal Conditioning, Audio Signal Processing, Battery-Powered Devices.
Photodiode Amplifier
The AD8615ARZ is ideal for photodiode amplifier circuits due to its low input bias current of 1 pA and low voltage noise of 8 nV/√Hz. In a transimpedance configuration, the amplifier converts the photodiode current to a voltage with minimal error. The wide 20 MHz bandwidth supports high-speed optical communication and light detection systems. The rail-to-rail output allows maximum dynamic range, and the low supply current makes it suitable for battery-powered optical sensors.
Recommended
Portable Instrumentation
The AD8615ARZ is well-suited for portable instrumentation due to its low supply current of 2 mA and operation from 2.7 V to 5.5 V. The rail-to-rail input and output maximize signal range in battery-powered devices. The low offset voltage of 65 µV ensures accurate measurements in data acquisition systems. The high output current of 150 mA allows direct drive of displays or actuators. The small SOIC package is ideal for space-constrained designs.
Recommended
Active Filters
The AD8615ARZ is excellent for active filter designs due to its 20 MHz bandwidth and 12 V/µs slew rate. These specifications allow implementation of high-frequency low-pass, high-pass, and band-pass filters with minimal phase error. The low noise and low distortion ensure clean signal processing. The rail-to-rail output enables filters to operate at full supply swing, which is beneficial in single-supply systems. The unity-gain stability simplifies filter design.
Recommended
Sensor Signal Conditioning
The AD8615ARZ is ideal for conditioning signals from high-impedance sensors such as pH probes, thermocouples, and piezoelectric sensors. The low input bias current of 1 pA minimizes loading errors, while the low offset voltage ensures accurate DC accuracy. The wide bandwidth supports dynamic sensor signals. The rail-to-rail input allows the amplifier to handle signals near the supply rails, which is common in single-supply sensor systems. The low power consumption is beneficial for remote or battery-powered sensors.
Recommended
Audio Signal Processing
The AD8615ARZ can be used in audio applications such as headphone amplifiers and active crossovers due to its low noise and high output current. The 8 nV/√Hz noise density ensures a low noise floor, while the 150 mA output current can drive headphones directly. The 20 MHz bandwidth is more than sufficient for audio frequencies, and the low distortion preserves signal fidelity. The rail-to-rail output maximizes headroom in battery-powered audio devices.
Recommended
Battery-Powered Devices
The AD8615ARZ is well-suited for battery-powered devices due to its low supply current of 2 mA and wide supply voltage range of 2.7 V to 5.5 V. The rail-to-rail input and output allow full signal swing even as the battery voltage drops. The low offset voltage and low noise ensure accurate signal processing in portable instruments. The small SOIC package and RoHS compliance make it easy to integrate into compact designs.
Recommended
Recommended Products Summary
Engineering reference data for AD8615ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8616ARZ | AD8515ARZ | OPA340UA |
|---|---|---|---|---|
| Package | 8-Lead SOIC | 8-Lead SOIC | 8-Lead SOIC | 8-Lead SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Number of Channels | 1 | 2 | 1 | 1 |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.5 V to 5.5 V |
| Offset Voltage (max) | 65 µV | 65 µV | 100 µV | 500 µV |
| Input Bias Current | 1 pA | 1 pA | 1 pA | 0.5 pA |
| Bandwidth | 20 MHz | 20 MHz | 11 MHz | 5.5 MHz |
| Slew Rate | 12 V/µs | 12 V/µs | 6 V/µs | 6 V/µs |
| Output Current | 150 mA | 150 mA | 70 mA | 50 mA |
| Supply Current | 2 mA | 4 mA (total) | 1.1 mA | 750 µA |
Key Differentiators
- Higher bandwidth and slew rate (vs OPA340UA)
- Lower offset voltage (vs AD8515ARZ)
- Higher output current (vs MCP6281-E/SN)
Design Notes
The AD8615ARZ operates from a single supply of 2.7 V to 5.5 V. Use a 0.1 µF ceramic capacitor close to the V+ pin and a 10 µF tantalum capacitor for bulk decoupling. For dual-supply operation, connect V- to the negative rail and add similar decoupling. Ensure the supply voltage does not exceed the absolute maximum rating of 6 V to prevent damage.
For optimal noise performance, keep the input traces short and use a ground plane. Place the feedback resistor and capacitor close to the inverting input to minimize parasitic capacitance. Use low-value resistors (e.g., 1 kΩ to 10 kΩ) in the feedback network to reduce noise and offset errors. Avoid routing high-speed digital traces near the input pins.
The AD8615ARZ has a rail-to-rail input stage, but the input common-mode range should not exceed the supply rails by more than 0.3 V. Exceeding this can cause phase reversal, although the device is designed to avoid it. Also, the output can source or sink 150 mA, but ensure the total power dissipation does not exceed the package's thermal limits. For high-output-current applications, consider the thermal resistance of the SOIC package.
Compliance Information
RoHS compliant per Analog Devices product page. No AEC-Q100 qualification indicated for this part.
