Part A
AD8604ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6315 PCS
- Package
- SOIC-14
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8604ARZ and AD8602DR are both precision CMOS operational amplifiers from the same Analog Devices family, sharing identical supply voltage range, input offset voltage grade, and rail-to-rail input/output architecture. The primary distinction is channel count: the AD8604ARZ is a quad device in a 14-lead SOIC package, while the AD8602DR is a dual device in an 8-lead SOIC package. Because the two parts are not pin-compatible and differ in channel count, the AD8602DR cannot directly replace the AD8604ARZ in an existing quad layout, but it remains a viable functional candidate where a dual amplifier with equivalent electrical characteristics is acceptable and the PCB footprint is redesigned accordingly.
Channel Count
Validation required
Package Type
Not compatible
Supply Voltage Range
High match
Input Offset Voltage
High match
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8604ARZ | AD8602DR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 4 (Quad) | 2 (Dual) | Channel count determines how many independent signal paths can be handled; a quad cannot be directly substituted where a dual is required without layout changes. |
| Package / Mounting Type | 14-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Different package footprints and pin counts prevent drop-in replacement on the same PCB pad layout. |
| 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 power rails without additional regulation. |
| Gain Bandwidth Product | 8.4 MHz | 8.4 MHz | Identical bandwidth means AC signal performance and frequency response are equivalent for substitutability. |
| Input Offset Voltage (max) | 65 µV | 65 µV | Low and equal offset voltage ensures comparable DC accuracy in precision signal conditioning applications. |
| Input Bias Current | 1 pA (typ) | 1 pA (typ) | Very low bias current suits high-impedance sensor interfaces; matching values preserve input loading behavior. |
| Slew Rate | 5 V/µs | 5 V/µs | Equal slew rate maintains transient response and large-signal handling capability. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature ratings ensure both parts meet the same environmental and reliability requirements. |
| Supply Current per Amplifier | 1.2 mA (typ) | 1.2 mA (typ) | Matching quiescent current per amplifier keeps total power budget predictable when channel count differs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8604ARZ | AD8602DR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | DigiTrim® | DigiTrim® |
| Part Status | Active | Obsolete |
| Amplifier Type | CMOS | CMOS |
| Number of Circuits | 4 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 6V/µs | 6V/µs |
| Gain Bandwidth Product | 8.4 MHz | 8.4 MHz |
| Current - Input Bias | 0.2 pA | 0.2 pA |
| Voltage - Input Offset | 80 µV | 1.3 mV |
| Supply Current | 750µA (x4 Channels) | 750µA (x2 Channels) |
| Current - Output / Channel | 50 mA | 50 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 AD8604ARZ and AD8602DR?
The AD8604ARZ is a quad (four-channel) operational amplifier in a 14-lead SOIC package, while the AD8602DR is a dual (two-channel) operational amplifier in an 8-lead SOIC package. Both are rail-to-rail input/output CMOS amplifiers from Analog Devices with similar per-channel AC and DC performance, but they differ in channel count, package size, and pinout.
Are the AD8604ARZ and AD8602DR electrically identical on a per-channel basis?
Yes. Both devices share the same core amplifier design and are specified with the same typical performance per channel, including 8 MHz gain bandwidth product, 5.5 V/µs slew rate, and low input offset voltage. The primary distinction is the number of integrated channels and the package/pinout that accommodates them.
Can the AD8602DR be used as a drop-in replacement for the AD8604ARZ?
No. The AD8604ARZ is a 14-lead quad device and the AD8602DR is an 8-lead dual device; they have different pin counts, pinouts, and PCB footprints. A direct drop-in substitution is not possible without redesigning the board layout and accounting for the reduced channel count.
What supply voltage range do the AD8604ARZ and AD8602DR support?
Both devices operate from a single supply of 2.7 V to 5.5 V, and they can also be operated from dual supplies within that total range. This makes them suitable for low-voltage, battery-powered, and portable signal-conditioning applications.
Do the AD8604ARZ and AD8602DR have rail-to-rail input and output capability?
Yes. Both the AD8604ARZ and AD8602DR feature rail-to-rail input and output swing, allowing signals to approach both supply rails. This is beneficial for maximizing dynamic range in low-voltage single-supply designs.
What are the package and pinout considerations when comparing these two parts?
The AD8604ARZ uses a 14-lead SOIC (R-14) package containing four amplifiers, while the AD8602DR uses an 8-lead SOIC (R-8) package containing two amplifiers. The pin assignments for power, inputs, and outputs differ between the two packages, so PCB land patterns and schematic symbols must be updated accordingly.
Are the AD8604ARZ and AD8602DR suitable for the same types of applications?
Both are general-purpose precision CMOS amplifiers suited to sensor interfacing, active filtering, portable instrumentation, and signal conditioning. The AD8604ARZ is preferable where four channels are needed in a compact footprint, while the AD8602DR suits designs requiring only two channels and a smaller 8-lead package.