AD8615AUJZ-REEL7 - 24MHz RRIO Precision Op-Amp | Analog Devices
MPN: AD8615AUJZ-REEL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.43 | $3.43 |
| 10 | $3.05 | $30.50 |
| 100 | $2.36 | $236.00 |
| 500 | $1.78 | $890.00 |
| 1,000 | $1.49 | $1,490.00 |
AD8615AUJZ-REEL7 Overview
A CMOS operational amplifier is a type of integrated analog building block that uses complementary MOS transistors in its gain stage to achieve very high input impedance, very low input bias current, and competitive noise performance on a single supply. Within the broader power-management and signal-chain hierarchy, an op-amp sits between active filters, ADC drivers, current-sense amplifiers, and instrumentation front ends, and the rail-to-rail input/output class extends the useful signal swing all the way to both supply rails - a critical capability when running from low-voltage single supplies (2.7-5 V). This category membership makes the part especially relevant in battery-powered and portable applications where every millivolt of headroom counts.
Key features that differentiate the AD8615 include 8 nV/√Hz input voltage noise, 1 pA typical input bias current, no phase reversal when the input is over-driven, a 150 mA high-output current capability for driving heavy loads, and unity-gain stability. The amplifier's patented digital trimming technique eliminates the need for laser trim while still achieving tight offset distribution, which simplifies the manufacturing flow and improves long-term drift behaviour.
Architecturally, the part combines a CMOS input differential pair with a class-AB rail-to-rail output stage, allowing the output to swing within tens of millivolts of either rail under moderate loads. The combination of wide bandwidth (>20 MHz), 12 V/µs slew rate, and 8 nV/√Hz noise floor positions the AD8615 between general-purpose op-amps (typically 1 MHz, 30 nV/√Hz) and low-noise audio op-amps, giving it strong performance-per-mA in signal-conditioning tasks.
Typical applications include photodiode transimpedance front ends, precision active filters, 16- to 18-bit SAR ADC driver buffers, portable instrumentation, sensor signal conditioning, and audio line drivers in single-supply designs. Its small TSOT-23-5 footprint also suits dense mixed-signal PCBs in wearables and IoT nodes.
When designing with this device, place a 0.1 µF decoupling capacitor within 5 mm of the supply pin and ensure the output load stays within the 150 mA continuous rating. For capacitive loads above 1 nF in unity-gain, a small isolation resistor (10-50 Ω) in series with the output prevents peaking and oscillation.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that are not aggregated in any single source on the web today.
Drop-in alternatives for AD8615AUJZ-REEL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD8613AUJZ-REEL7
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AD8655AUJZ
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AD8615AUJZ
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AD8615AUJZ-REEL
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TLV3541IDBVR
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AD8615AUJZ-REEL7 Maximum Ratings & Electrical Characteristics
| Number of Channels | 1 |
| Amplifier Type | Precision, CMOS, Rail-to-Rail Input/Output |
| Gain Bandwidth Product | 24 MHz |
| Slew Rate | 12 V/µs |
| Input Offset Voltage (max) | 65 µV |
| Input Bias Current (typ) | 1 pA |
| Input Voltage Noise Density | 8 nV/√Hz |
| Supply Voltage Range (single) | 2.7 V to 5.0 V |
| Supply Current (typ per channel) | 2 mA |
| Output Current (typ) | 150 mA |
| Output Type | Rail-to-Rail |
| Phase Reversal | None |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | TSOT-23-5 (UJ) |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| RoHS Status | Compliant |
AD8615AUJZ-REEL7 Pin Configuration
| Pin 1 | OUTPUT — Amplifier output (rail-to-rail) |
| Pin 2 | V- — Negative supply (or GND in single-supply) |
| Pin 3 | IN+ — Non-inverting input |
| Pin 4 | IN- — Inverting input |
| Pin 5 | NC — Not connected (per datasheet) |
Typical Applications
AD8615AUJZ-REEL7 is suitable for 6 applications: Photodiode Transimpedance Amplifier, 16-bit SAR ADC Driver Buffer, Precision Active Filter (Sallen-Key / Multiple-Feedback), Portable Sensor Signal Conditioning, Audio Line Driver / Headphone Buffer, Industrial Process-Control Front End.
Photodiode Transimpedance Amplifier
The AD8615AUJZ-REEL7's 1 pA typical input bias current and 8 nV/√Hz input voltage noise make it a strong fit for photodiode transimpedance front ends in instrumentation and analytical instruments. Placing the photodiode at the inverting input with a 1 MΩ to 10 MΩ feedback resistor converts µA-scale photocurrents into mV-scale voltages, while the 24 MHz GBW and 12 V/µs slew rate preserve pulse rise time for pulsed-laser or time-resolved measurements. Compared with general-purpose op-amps, the AD8615 adds 50 mA of headroom in output drive, so it can also feed a downstream 16-bit SAR ADC without an additional buffer. Recommended companions include the ADI AD549 ultra-low-bias reference front end and the ADA4530 for femtoampere-class extensions.
Recommended
16-bit SAR ADC Driver Buffer
The AD8615AUJZ-REEL7 acts as a precision input buffer for 16- to 18-bit successive-approximation ADCs such as the AD7606 family, where its 24 MHz GBW and 12 V/µs slew rate settle a full-scale 5 V step to within 1 LSB in well under 1 µs. The amplifier's 65 µV maximum offset is far below the 76 µV LSB of a 16-bit ADC at 5 V, so it does not dominate system error, and the 2 mA quiescent draw keeps it from inflating power budgets in multi-channel data-acquisition boards. The rail-to-rail input accepts signals that swing to both supply rails, simplifying single-supply anti-alias filter design. Use a 10-50 Ω series resistor at the output when driving >1 nF capacitive loads to suppress peaking.
Recommended
Precision Active Filter (Sallen-Key / Multiple-Feedback)
The AD8615AUJZ-REEL7 is well suited to active low-pass, high-pass, and band-pass filters in the 10 kHz to 1 MHz cutoff range, where its 24 MHz GBW provides at least 30x loop-gain headroom above the filter pole for predictable Butterworth, Bessel, or Chebyshev responses. The 8 nV/√Hz input voltage noise floor keeps the filter's output noise spectral density below 1 µV/√Hz in most topologies, while the 65 µV offset preserves DC accuracy in instrumentation paths. Unity-gain stability and rail-to-rail output allow direct connection to single-supply ADCs without DC blocking capacitors. Sallen-Key topologies in particular benefit from the amplifier's 150 mA output current when driving low-impedance filters.
Recommended
Portable Sensor Signal Conditioning
Battery-powered sensor nodes benefit from the AD8615AUJZ-REEL7's 2 mA quiescent current, 2.7 V minimum supply, and tiny TSOT-23-5 footprint, which together enable weeks-to-months of operating life from a small Li-ion cell. The 1 pA bias current is ideal for high-impedance electrochemical sensors (pH, conductivity, gas), while the rail-to-rail input/output removes the need for negative rails in single-supply bridges and thermocouple interfaces. Its 24 MHz GBW handles 100 kHz-class MEMS microphones and vibration sensors with margin to spare. Pair with the AD8237ARMZ micropower instrumentation front end for full bridge conditioning.
Recommended
Audio Line Driver / Headphone Buffer
The AD8615AUJZ-REEL7's 8 nV/√Hz voltage noise, 0.0003 % THD-equivalent linearity, and 150 mA output current make it a competent single-supply audio line driver and headphone buffer in portable players and USB audio DACs. The rail-to-rail output swing delivers maximum headroom on 3.3 V or 5 V rails, while the 12 V/µs slew rate preserves transient integrity for impulsive content. Two AD8615 channels can be paralleled (with a 10 Ω sharing resistor) to double output drive into 32 Ω headphones without oscillation. Recommended companions include the AD1938YSTZ audio codec and the ADAU1761 for USB-headphone designs.
Recommended
Industrial Process-Control Front End
The AD8615AUJZ-REEL7 is specified from -40 °C to +125 °C, making it suitable for industrial 4-20 mA loops, PLC analog input modules, and process-control front ends that must operate in unconditioned enclosures. Its 65 µV offset and 1 pA bias current preserve 16-bit measurement accuracy when digitizing thermocouple, RTD, and strain-gauge signals via precision external references. The 24 MHz GBW is far above the 1-10 kHz bandwidth of typical process signals, so the op-amp adds no measurable dynamic error. Use the AD8615 as the first gain stage in front of an isolation barrier (ADuM1411) feeding a 16-bit sigma-delta ADC.
Recommended
Recommended Products Summary
Engineering reference data for AD8615AUJZ-REEL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8613AUJZ-REEL7 | AD8655AUJZ | AD8615AUJZ | AD8615AUJZ-REEL | TLV3541IDBVR |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Package | TSOT-23-5 (UJ) | TSOT-23-5 (UJ) - same | TSOT-23-5 (UJ) - same | TSOT-23-5 (UJ) - same | TSOT-23-5 (UJ) - same | TSOT-23-5 (DBV) - same |
| Gain Bandwidth Product | 24 MHz | ~10 MHz | ~10 MHz | 24 MHz | 24 MHz | ~100 MHz |
| Slew Rate | 12 V/µs | 5 V/µs | 11 V/µs | 12 V/µs | 12 V/µs | 180 V/µs |
| Supply Voltage Range | 2.7 V to 5.0 V | 2.7 V to 5.0 V | 2.7 V to 5.5 V | 2.7 V to 5.0 V | 2.7 V to 5.0 V | 1.8 V to 5.5 V |
| Rail-to-Rail I/O | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Higher gain-bandwidth product than AD8613 in the same footprint (vs AD8613AUJZ-REEL7)
- Lower input voltage noise than most same-class CMOS op-amps (vs TLV3541IDBVR)
- Patented digital trimming avoids laser trim, improving long-term drift (vs Generic CMOS op-amps)
Design Notes
Place a 0.1 µF X7R ceramic decoupling capacitor within 5 mm of the V+ pin (TSOT-23-5 pin 2) and a bulk 1 µF to 10 µF tantalum or ceramic capacitor on the same rail. The AD8615 draws approximately 2 mA quiescent current at 5 V (10 mW), so parasitic supply-rail inductance can inject noise into the input stage if bypass is poor. For low-noise applications, add a small ferrite bead or 10 Ω resistor in series with the supply trace.
Keep input traces short and shielded with a ground guard ring to minimize leakage and stray capacitance, particularly on the high-impedance non-inverting input (pin 3). The AD8615's 1 pA input bias current means that even 1 GΩ of PCB contamination can cause ~1 mV of offset drift. Clean the PCB with isopropanol after assembly and use a guard trace driven by a buffered version of the input common-mode voltage to eliminate leakage paths.
When driving capacitive loads greater than ~1 nF directly from the output (pin 1) in unity-gain configurations, the amplifier can exhibit gain peaking and oscillation. Insert a 10-50 Ω isolation resistor in series with the output to decouple the capacitive load from the op-amp's output stage. Estimated: with a 1 nF load and 50 Ω resistor, the pole moves to approximately 3.2 MHz - well above the audio band but safely below the 24 MHz GBW.
The TSOT-23-5 package has a θJA of approximately 200 °C/W (per Analog Devices package thermal data), so continuous output currents near the 150 mA rating can self-heat the die significantly. Estimated: at 150 mA into a 1 V load with a 5 V supply, internal dissipation is 0.6 W, producing a die-temperature rise of 120 °C above ambient. Limit continuous output current to 50-80 mA in enclosed designs to maintain reliability across the -40 °C to +125 °C range.
Compliance Information
RoHS and lead-free per Analog Devices product page. Operating temperature -40C to +125C. Not AEC-Q100 qualified.
