Part A
ADA4665-2ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3904 Stückzahl
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The ADA4666-2ARMZ is a compatible functional replacement candidate for the ADA4665-2ARMZ, sharing the same dual op-amp configuration, MSOP-8 package, and supply voltage range, while offering a higher gain-bandwidth product and improved slew rate. Designers should validate noise performance and quiescent current in the target application before final qualification.
Amplifier Configuration
High match
Package Type
High match
Supply Voltage Range
High match
Gain-Bandwidth Product
Validation required
Parts at a glance
Part B
ADA4666-2ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7397 Stückzahl
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADA4666-2ARMZ | ADA4665-2ARMZ | Why it matters |
|---|---|---|---|
| Supply Voltage Range | 4 V to 18 V | 2.7 V to 16 V | Determines compatibility with the system power rail; the wider range of the ADA4666 allows operation at higher supply voltages. |
| Input Offset Voltage (max) | 0.5 mV | 1.5 mV | Lower offset improves DC accuracy in precision signal-conditioning applications. |
| Input Bias Current (typ) | 1 pA | 0.5 pA | Very low bias current minimizes errors in high-impedance sensor and photodiode front ends. |
| Gain Bandwidth Product | 4 MHz | 1.2 MHz | Higher bandwidth supports faster signal processing and wider closed-loop bandwidth. |
| Slew Rate | 2 V/µs | 1 V/µs | Faster slew rate enables larger signal swings at higher frequencies without distortion. |
| Supply Current per Amplifier (typ) | 0.58 mA | 0.29 mA | Lower quiescent current extends battery life in portable and low-power designs. |
| Input Voltage Noise Density (1 kHz) | 22 nV/√Hz | 22 nV/√Hz | Noise density affects the achievable signal-to-noise ratio in low-level signal amplification. |
| Common-Mode Rejection Ratio (typ) | 120 dB | 105 dB | Higher CMRR rejects common-mode interference, improving accuracy in differential sensing. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Confirms suitability for industrial and automotive environments requiring extended temperature operation. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Identical package enables drop-in PCB replacement without layout changes. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADA4665-2ARMZ | ADA4666-2ARMZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | CMOS | CMOS |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 1V/µs | 2V/µs |
| Gain Bandwidth Product | 1.2 MHz | 4 MHz |
| Current - Input Bias | 0.1 pA | 0.5 pA |
| Voltage - Input Offset | 1 mV | 500 µV |
| Supply Current | 290µA (x2 Channels) | 630µA (x2 Channels) |
| Current - Output / Channel | 30 mA | 220 mA |
| Voltage - Supply Span(Min) | 5 V | 3 V |
| Voltage - Supply Span(Max) | 16 V | 18 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| -3 dB Bandwidth | - | 2.1 MHz |
Frequently asked questions
What are the primary differences between the ADA4666-2ARMZ and ADA4665-2ARMZ operational amplifiers?
The ADA4666-2ARMZ is a dual, low-power, rail-to-rail input/output operational amplifier with a typical gain bandwidth product of 4 MHz and a typical slew rate of 2 V/µs. The ADA4665-2ARMZ is a dual, low-power, rail-to-rail input/output operational amplifier with a typical gain bandwidth product of 1.4 MHz and a typical slew rate of 0.5 V/µs. Both are specified for operation from 2.7 V to 5.5 V single supply and are offered in an 8-lead MSOP (RM) package.
Are the ADA4666-2ARMZ and ADA4665-2ARMZ pin-compatible?
Yes. Both devices are offered in the same 8-lead MSOP (RM) package and use the same standard dual operational amplifier pinout: pin 1 = OUT A, pin 2 = -IN A, pin 3 = +IN A, pin 4 = V-, pin 5 = +IN B, pin 6 = -IN B, pin 7 = OUT B, and pin 8 = V+. This allows the two parts to share the same PCB footprint, but electrical differences must still be validated for the target design.
Can the ADA4665-2ARMZ be used as a drop-in replacement for the ADA4666-2ARMZ?
Pin compatibility in the 8-lead MSOP package allows a shared footprint, but the ADA4665-2ARMZ has lower gain bandwidth (1.4 MHz typical vs. 4 MHz typical) and lower slew rate (0.5 V/µs typical vs. 2 V/µs typical) than the ADA4666-2ARMZ. A replacement should only be made after verifying that the reduced bandwidth and slew rate meet the stability, settling, and signal integrity requirements of the target circuit.
What supply voltage range do the ADA4666-2ARMZ and ADA4665-2ARMZ support?
Both the ADA4666-2ARMZ and ADA4665-2ARMZ are specified for single-supply operation from 2.7 V to 5.5 V. Designs should confirm the exact supply range and any dual-supply conditions against the respective manufacturer datasheet before use.
Do the ADA4666-2ARMZ and ADA4665-2ARMZ have rail-to-rail input and output stages?
Yes. Both the ADA4666-2ARMZ and ADA4665-2ARMZ are rail-to-rail input and output (RRIO) operational amplifiers, allowing input and output signal swings close to both supply rails. Actual headroom and linearity limits should be verified from the manufacturer datasheet for the specific operating conditions.
Which part is better suited for higher-bandwidth signal conditioning?
The ADA4666-2ARMZ is better suited for higher-bandwidth signal conditioning because its typical gain bandwidth product is 4 MHz and its typical slew rate is 2 V/µs, compared with 1.4 MHz and 0.5 V/µs for the ADA4665-2ARMZ. Circuit stability, capacitive load, and closed-loop gain should still be evaluated for the specific application.
Are the ADA4666-2ARMZ and ADA4665-2ARMZ suitable for low-power portable designs?
Both devices are low-power operational amplifiers intended for portable and battery-powered applications. However, exact quiescent current, input bias current, and noise specifications should be taken from the official manufacturer datasheet for the selected part, since these parameters determine the actual power and accuracy trade-offs in a design.