Part A
ADA4666-2ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7397 PCS
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The ADA4666-2ARMZ is a viable functional replacement candidate for the ADA4610-2ARMZ in many low-power, low-frequency signal-chain applications, as both are dual op-amps in the same 8-lead MSOP package with comparable supply voltage ranges. However, the ADA4610-2ARMZ offers substantially higher bandwidth, slew rate, and lower input bias current, so designs relying on its AC performance or high-impedance sensing should validate the substitution before release.
Package Type
High match
Supply Voltage Range
High match
Gain Bandwidth Product
Not compatible
Input Bias Current
Validation required
Parts at a glance
Part B
ADA4610-2ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6414 PCS
- Package
- MSOP-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADA4610-2ARMZ | ADA4666-2ARMZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 2 | Both are dual op-amps, so channel count is compatible for direct substitution in dual-channel designs. |
| Supply Voltage Range | ±4.5 V to ±15 V (9 V to 30 V total) | ±2.5 V to ±9 V (5 V to 18 V total) | The ADA4610-2 supports higher supply rails, so it can replace the ADA4666-2 in higher-voltage systems, but not vice versa without checking headroom. |
| Input Offset Voltage (max) | 0.3 mV | 0.5 mV | Lower offset voltage improves DC accuracy; the ADA4610-2 offers tighter offset, beneficial for precision signal chains. |
| Input Bias Current (typ) | 0.5 pA | 1 pA | Ultra-low bias current is critical for high-impedance sensor and photodiode front-ends; both are excellent but the ADA4610-2 is slightly lower. |
| Gain Bandwidth Product | 16 MHz | 4 MHz | GBW determines achievable closed-loop bandwidth; the ADA4610-2 supports wider-bandwidth circuits than the ADA4666-2. |
| Slew Rate | 25 V/µs | 2 V/µs | Higher slew rate enables faster large-signal response; the ADA4610-2 is better suited for high-speed or large-swing applications. |
| Input Voltage Noise Density | 7.3 nV/√Hz | 18 nV/√Hz | Lower voltage noise improves SNR in low-level signal amplification; the ADA4610-2 is quieter. |
| Quiescent Current per Amplifier (typ) | 1.5 mA | 0.55 mA | Lower quiescent current extends battery life; the ADA4666-2 is more power-efficient for portable designs. |
| Rail-to-Rail Input/Output | Rail-to-rail output (input to within 1.5 V of rails) | Rail-to-rail input and output | RRIO allows full-swing signal handling near supply rails; the ADA4666-2 offers true rail-to-rail input, which the ADA4610-2 does not. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both cover the industrial temperature range, so environmental compatibility is equivalent for substitution. |
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 | ADA4666-2ARMZ | ADA4610-2ARMZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | CMOS | J-FET |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 2V/µs | 61V/µs |
| Gain Bandwidth Product | 4 MHz | 16.3 MHz |
| -3 dB Bandwidth | 2.1 MHz | 9.5 MHz |
| Current - Input Bias | 0.5 pA | 5 pA |
| Voltage - Input Offset | 500 µV | 400 µV |
| Supply Current | 630µA (x2 Channels) | 1.6mA (x2 Channels) |
| Current - Output / Channel | 220 mA | 79 mA |
| Voltage - Supply Span(Min) | 3 V | 10 V |
| Voltage - Supply Span(Max) | 18 V | 30 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADA4610-2ARMZ and ADA4666-2ARMZ?
The ADA4610-2ARMZ is a dual low-noise, low-input-bias-current JFET-input op amp optimized for high DC precision, while the ADA4666-2ARMZ is a dual low-power, rail-to-rail input/output CMOS op amp optimized for low supply current and wide supply range. They differ in input bias current, noise, supply current, and output swing characteristics, so they are not interchangeable without design validation.
Are the ADA4610-2ARMZ and ADA4666-2ARMZ pin-compatible in the same package?
Both are offered in an 8-lead MSOP (RM-8) package with the same standard dual op amp pinout (1=OUT A, 2=-IN A, 3=+IN A, 4=V-, 5=+IN B, 6=-IN B, 7=OUT B, 8=V+). Pin functions match, but electrical differences mean a direct drop-in substitution still requires validation.
How do the input bias currents of the ADA4610-2 and ADA4666-2 compare?
The ADA4610-2 uses a JFET input stage with very low input bias current (typically in the picoamp range), making it suitable for high-impedance sensor interfaces. The ADA4666-2 uses a CMOS input stage with input bias current typically in the low picoamp range as well, but the exact values should be confirmed from the respective datasheets for the operating temperature of interest.
Which device is better for low-power battery-operated designs?
The ADA4666-2ARMZ is generally the lower-power choice, with a typical supply current per amplifier in the hundreds of microamps and a wide supply range, making it suited to battery-powered and portable systems. The ADA4610-2 draws more supply current per amplifier and is intended for precision/low-noise applications rather than minimum power consumption.
How do the noise characteristics of the ADA4610-2 and ADA4666-2 differ?
The ADA4610-2 is specified as a low-noise JFET-input amplifier with low voltage noise density, making it preferable for low-noise signal conditioning. The ADA4666-2 is a low-power CMOS amplifier whose noise performance is higher than the ADA4610-2; designers should consult the datasheet noise density curves when noise is critical.
Do both amplifiers support rail-to-rail output swing?
The ADA4666-2ARMZ features rail-to-rail input and output operation, allowing signals to swing close to both supply rails. The ADA4610-2ARMZ has rail-to-rail output but its input common-mode range does not extend to both rails. This difference affects headroom and signal range in single-supply designs.
What supply voltage ranges do the ADA4610-2ARMZ and ADA4666-2ARMZ support?
The ADA4610-2ARMZ operates from a dual supply typically in the ±4.5 V to ±15 V range (approximately 9 V to 30 V total). The ADA4666-2ARMZ supports a wider single-supply range, typically 2.7 V to 16 V (or ±1.35 V to ±8 V dual). Designs migrating between the two must verify the supply rails fall within the target device's specified range.
Can the ADA4666-2ARMZ replace the ADA4610-2ARMZ in a precision DC application?
Not without evaluation. The ADA4610-2 offers lower offset voltage, lower offset drift, and lower noise than the ADA4666-2, so substituting the lower-power ADA4666-2 may degrade DC accuracy and noise performance. The replacement should only be made after verifying offset, drift, noise, and bandwidth against the application requirements.