ADA4661-2ARMZ-RL7 - Dual Precision RRIO Op Amp | Analog Devices
MPN: ADA4661-2ARMZ-RL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.82 | $1,820.00 |
Drop-in alternatives for ADA4661-2ARMZ-RL7 — 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:
ADA4661-2ARMZ
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →ADA4661-2ARMZ-RL
✅ Drop-In📋 Reference alternative (not in catalog)
ADA4666-2ARMZ
✅ Drop-In📋 Reference alternative (not in catalog)
ADA4666-2ARMZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
ADA4661-2ARMZ-RL7 Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Supply Voltage Range | 3 V to 18 V (single), ±1.5 V to ±9 V (dual) |
| Gain Bandwidth Product | 4 MHz |
| Slew Rate | 1.7 V/µs |
| Supply Current per Amplifier | 725 µA |
| Input Offset Voltage | 90 µV (max) |
| Input Bias Current | 1 pA (typical) |
| Open-Loop Gain | 120 dB |
| Common-Mode Rejection Ratio | 135 dB (typical) |
| Power Supply Rejection Ratio | 140 dB (typical) |
| Output Current | 15 mA (source/sink) |
| Capacitive Load Stability | 100 pF |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-lead MSOP |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ADA4661-2ARMZ-RL7 Pin Configuration
| Pin 1 | OUT A — Output of amplifier A |
| Pin 2 | -IN A — Inverting input of amplifier A |
| Pin 3 | +IN A — Non-inverting input of amplifier A |
| Pin 4 | V- — Negative supply (ground in single-supply operation) |
| Pin 5 | +IN B — Non-inverting input of amplifier B |
| Pin 6 | -IN B — Inverting input of amplifier B |
| Pin 7 | OUT B — Output of amplifier B |
| Pin 8 | V+ — Positive supply |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
ADA4661-2ARMZ-RL7 is suitable for 6 applications: Sensor Signal Conditioning, Data Acquisition Systems, Active Filters, Portable Instrumentation, Automotive Electronics, Medical Devices.
Sensor Signal Conditioning
The ADA4661-2ARMZ-RL7 is ideal for conditioning signals from sensors such as thermocouples, strain gauges, and photodiodes. Its low input bias current of 1 pA minimizes errors when interfacing with high-impedance sensors, and the rail-to-rail output allows direct connection to ADCs. The 4 MHz bandwidth supports fast sensor response, while the low offset voltage of 90 µV ensures accurate measurement. In a typical bridge amplifier configuration, the dual channels can be used for differential amplification and filtering, providing a clean, amplified signal to a microcontroller's ADC. The wide supply range from 3 V to 18 V accommodates various system power rails, and the low power consumption of 725 µA per amplifier is suitable for battery-powered sensor nodes.
Recommended
Data Acquisition Systems
In data acquisition systems, the ADA4661-2ARMZ-RL7 serves as a buffer or gain stage before an ADC. Its rail-to-rail output ensures the full-scale range of the ADC is utilized, and the low noise and high CMRR of 135 dB reject common-mode interference. The 4 MHz bandwidth allows accurate sampling of signals up to a few hundred kHz, and the low supply current is beneficial in multi-channel systems where many amplifiers are used. The dual-channel configuration saves board space and cost compared to using two single op amps. The device can be used in active filters, sample-and-hold circuits, and as a driver for high-resolution ADCs like the AD7799. Its wide supply range and industrial temperature range make it suitable for industrial data loggers and portable instruments.
Recommended
Active Filters
The ADA4661-2ARMZ-RL7 is well-suited for active filter designs, such as low-pass, high-pass, and band-pass filters, due to its 4 MHz gain bandwidth product and rail-to-rail output. The dual-channel configuration allows implementation of second-order filters with a single IC, reducing component count. The low offset voltage and high open-loop gain ensure accurate filter response, and the low power consumption is advantageous in portable devices. For example, a Sallen-Key low-pass filter with a cutoff frequency of 100 kHz can be easily designed using this op amp. The wide supply range allows operation from a single 5 V supply in battery-powered equipment. The device's stability with capacitive loads up to 100 pF ensures reliable performance in filter circuits with parasitic capacitance.
Recommended
Portable Instrumentation
The ADA4661-2ARMZ-RL7 is ideal for portable instrumentation such as handheld multimeters, portable medical devices, and field transmitters. Its low supply current of 725 µA per amplifier extends battery life, and the wide supply range from 3 V to 18 V allows operation from a variety of battery configurations. The rail-to-rail input and output maximize dynamic range with low supply voltages, and the precision specifications ensure accurate measurements. The small 8-lead MSOP package saves board space in compact designs. The device can be used in signal conditioning, level shifting, and as a buffer for sensors. Its extended temperature range of -40°C to +125°C ensures reliable operation in outdoor environments.
Recommended
Automotive Electronics
The ADA4661-2ARMZ-RL7 is suitable for automotive electronics such as battery monitoring, motor control, and sensor interfaces. Its wide supply range of 3 V to 18 V covers typical automotive battery voltages, and the extended temperature range of -40°C to +125°C meets automotive requirements. The low offset voltage and high CMRR ensure accurate signal processing in noisy environments. The rail-to-rail output allows direct interface to automotive microcontrollers. The device can be used in current sensing, voltage monitoring, and signal conditioning for pressure and temperature sensors. Its low power consumption is beneficial in always-on systems. The dual-channel configuration reduces component count in multi-sensor applications.
Recommended
Medical Devices
The ADA4661-2ARMZ-RL7 is used in medical devices such as patient monitors, glucose meters, and portable ECG devices. Its low power consumption is critical for battery-operated devices, and the precision specifications ensure accurate measurement of physiological signals. The rail-to-rail output allows direct interface to ADCs, and the low input bias current minimizes loading on high-impedance electrodes. The wide supply range accommodates various battery configurations. The device can be used in instrumentation amplifiers, filters, and buffer stages. Its small package and dual-channel configuration are advantageous in compact medical devices. The extended temperature range ensures reliable operation in clinical environments.
Recommended
Recommended Products Summary
Engineering reference data for ADA4661-2ARMZ-RL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADA4661-2ARMZ | ADA4661-2ARMZ-RL | ADA4666-2ARMZ | ADA4666-2ARMZ-R7 |
|---|---|---|---|---|---|
| Package | 8-lead MSOP | 8-lead MSOP | 8-lead MSOP | 8-lead MSOP | 8-lead MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Supply Voltage Range | 3 V to 18 V | 3 V to 18 V | 3 V to 18 V | 3 V to 18 V | 3 V to 18 V |
| Gain Bandwidth Product | 4 MHz | 4 MHz | 4 MHz | 10 MHz | 10 MHz |
| Supply Current per Amplifier | 725 µA | 725 µA | 725 µA | 1.1 mA | 1.1 mA |
| Input Offset Voltage (max) | 90 µV | 90 µV | 90 µV | 90 µV | 90 µV |
| Input Bias Current | 1 pA | 1 pA | 1 pA | 1 pA | 1 pA |
| CMRR | 135 dB | 135 dB | 135 dB | 135 dB | 135 dB |
Key Differentiators
- Low supply current of 725 µA per amplifier (vs ADA4666-2ARMZ)
- Wide supply voltage range of 3 V to 18 V (vs AD8628ARZ)
- Rail-to-rail input and output (vs OP2177ARZ-REEL7)
Design Notes
The ADA4661-2ARMZ-RL7 operates from 3 V to 18 V single supply or ±1.5 V to ±9 V dual supply. Ensure the supply voltage does not exceed the absolute maximum rating of 20 V. Use 0.1 µF ceramic capacitors close to the V+ and V- pins for decoupling, and a 10 µF bulk capacitor if the supply is noisy. The low quiescent current of 725 µA per amplifier makes it suitable for battery-powered designs, but consider the total current draw of all amplifiers and other circuitry.
For optimal performance, place the ADA4661-2ARMZ-RL7 on a PCB with a solid ground plane. Keep the input traces short and shielded to minimize noise pickup. The MSOP package has a thermal pad (exposed pad) that should be soldered to the PCB for improved thermal performance, although the device's low power dissipation may not require it. Use a 4-layer stackup if possible, with dedicated power and ground planes. Ensure the feedback network components are placed close to the amplifier to reduce parasitic capacitance and inductance.
Avoid exceeding the input common-mode range, which extends 100 mV beyond the supply rails. Applying voltages beyond this range can cause phase reversal or latch-up. Also, do not drive the output beyond the specified output current of 15 mA, as this can degrade performance or damage the device. When driving capacitive loads greater than 100 pF, add a series resistor (e.g., 50 Ω) to maintain stability. Ensure the feedback resistor values are not too high (e.g., >1 MΩ) to avoid noise and offset errors due to bias current.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified. Lead-free per datasheet.
