Part A
AD8655ARZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7253 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8655ARZ is a viable functional replacement candidate for the AD8652ARZ in many low-noise precision signal-chain applications, as both share the same SOIC-8 footprint, CMOS rail-to-rail input/output architecture, and single-supply operating range. Designers should validate bandwidth, noise, and drive capability against the specific circuit requirements before substituting, since the two devices differ in gain-bandwidth, voltage noise density, and output current.
Package and Pinout
High match
Amplifier Architecture
High match
Gain-Bandwidth Product
Validation required
Output Drive Current
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8652ARZ | AD8655ARZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (Dual) | 1 (Single) | Channel count determines whether the part can serve multi-channel signal chains; a dual cannot directly replace a single in a one-channel layout without layout changes. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching supply ranges ensure both parts operate in the same system rails without additional regulation or level shifting. |
| Gain Bandwidth Product | 28 MHz | 28 MHz | GBW sets the achievable closed-loop bandwidth and small-signal speed; identical values mean comparable AC performance in the same circuit. |
| Input Offset Voltage (Max) | 250 µV | 250 µV | Offset voltage directly affects DC accuracy; equal limits mean comparable precision for sensor and instrumentation front ends. |
| Input Voltage Noise Density | 5 nV/√Hz | 5 nV/√Hz | Low noise density is critical for small-signal amplification; matching values preserve noise performance in sensitive analog paths. |
| Quiescent Current per Amplifier | 4.5 mA | 4.5 mA | Quiescent current drives power budget; identical per-amplifier draw keeps total consumption predictable when channel count changes. |
| Input Bias Current | 1 pA (typ) | 1 pA (typ) | CMOS inputs with picoamp bias current minimize errors in high-impedance sources; matching values preserve accuracy with resistive sensors. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature ratings confirm both parts suit the same industrial and automotive environments. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package footprint allows board-level drop-in compatibility, though pinout differs between single and dual configurations. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8655ARZ | AD8652ARZ |
|---|---|---|
| Series | DigiTrim® | DigiTrim® |
| Part Status | Active | Active |
| Amplifier Type | General Purpose | CMOS |
| Number of Circuits | 1 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 11V/µs | 41V/µs |
| Gain Bandwidth Product | 28 MHz | 50 MHz |
| Current - Input Bias | 1 pA | 1 pA |
| Voltage - Input Offset | 50 µV | 90 µV |
| Supply Current | 3.7mA | 17.5mA |
| Current - Output / Channel | 220 mA | 40 mA |
| Voltage - Supply Span(Min) | 2.7 V | 2.7 V |
| Voltage - Supply Span(Max) | 5.5 V | 5.5 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the AD8652ARZ and AD8655ARZ operational amplifiers?
The AD8652ARZ is a dual-channel, low-noise, precision CMOS operational amplifier, while the AD8655ARZ is a single-channel version of the same amplifier core. Both share similar voltage noise density (approximately 4.5 nV/√Hz at 1 kHz), rail-to-rail input and output capability, and a 28 MHz gain bandwidth product, but differ in channel count and package pinout.
Are the AD8652ARZ and AD8655ARZ pin-compatible?
No. The AD8652ARZ is a dual op-amp supplied in an 8-lead SOIC package, whereas the AD8655ARZ is a single op-amp supplied in an 8-lead SOIC package with a different pin assignment. The dual device uses pins for two independent amplifiers, while the single device uses the same footprint for one amplifier plus additional pins for offset nulling or no-connect functions. They are not drop-in replacements for each other.
What is the specified supply voltage range for both the AD8652ARZ and AD8655ARZ?
Both devices are specified for operation from a single supply of 2.7 V to 5.5 V, or from dual supplies of ±1.35 V to ±2.75 V. This makes them suitable for low-voltage portable and battery-powered signal conditioning applications.
How does the input voltage noise of the AD8652ARZ compare with the AD8655ARZ?
The input voltage noise density is essentially identical between the two devices because they share the same amplifier core. Both are specified at approximately 4.5 nV/√Hz at 1 kHz, making them suitable for low-noise precision signal chains in both single and dual configurations.
Can the AD8655ARZ be used in a dual-amplifier circuit by combining two packages?
Yes, two AD8655ARZ single amplifiers can be used to implement a dual-amplifier function, but this requires two separate packages and additional board area compared with a single AD8652ARZ. The AD8652ARZ integrates two amplifiers in one 8-lead SOIC package, offering a more compact solution when two channels are needed.
What are the input bias current and offset voltage specifications for these devices?
Both the AD8652ARZ and AD8655ARZ feature CMOS inputs with very low input bias current, typically in the picoampere range, and a low input offset voltage. The offset voltage is trimmed at the factory to a low value, making both devices suitable for high-impedance sensor interfaces and precision DC applications. Exact limits should be confirmed against the respective manufacturer datasheets.
Which applications are better suited to the AD8652ARZ versus the AD8655ARZ?
The AD8652ARZ is preferred where two matched low-noise amplifiers are required in a compact footprint, such as dual-channel active filters, differential signal conditioning, or stereo audio front ends. The AD8655ARZ is preferred where only one amplifier channel is needed, reducing cost and board space in single-channel sensor or transducer interfaces.