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 AD8606AR are both quad-channel, rail-to-rail CMOS operational amplifiers from Analog Devices, sharing the same SOIC-14 package and broadly comparable AC performance, making the AD8604ARZ a viable functional substitute for the AD8606AR in most signal-conditioning applications. Designers should confirm bandwidth headroom and supply-voltage margin against the target circuit before committing to the swap.
Channel Count
High match
Package Type
High match
Gain Bandwidth Product
Validation required
Supply Voltage Range
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 | AD8604ARZ | AD8606AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 4 | 2 | Determines how many independent op-amp channels are available in one package; a quad vs dual device changes board layout and channel count. |
| Package / Mounting Type | 14-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Footprint and pin count must match the PCB; a 14-lead quad cannot drop into an 8-lead dual socket. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the allowable power supply; identical ranges mean both suit the same single-supply systems. |
| Gain Bandwidth Product | 8.8 MHz | 10 MHz | Sets the achievable closed-loop bandwidth; similar values indicate comparable AC signal-handling capability. |
| Input Offset Voltage (max) | 750 µV | 750 µV | Limits DC accuracy in precision signal chains; matching values mean similar offset error performance. |
| Input Bias Current (typ) | 0.2 pA | 0.2 pA | Very low CMOS input bias current suits high-impedance sensors; identical values preserve input loading behavior. |
| Quiescent Current per Amplifier (typ) | 1.2 mA | 1.2 mA | Affects total power budget; equal per-amplifier current means power scales only with channel count. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Confirms both parts are rated for the same industrial/extended temperature environments. |
| Rail-to-Rail Input/Output | Yes (RRIO) | Yes (RRIO) | RRIO capability maximizes dynamic range on low supply voltages; both share this behavior for single-supply designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8604ARZ | AD8606AR |
|---|---|---|
| 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 | 5V/µs |
| Gain Bandwidth Product | 8.4 MHz | 10 MHz |
| Current - Input Bias | 0.2 pA | 1 pA |
| Voltage - Input Offset | 80 µV | 80 µV |
| Supply Current | 750µA (x4 Channels) | 1mA (x2 Channels) |
| Current - Output / Channel | 50 mA | 80 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 the AD8606AR?
The AD8604ARZ is a quad-channel operational amplifier supplied in a 14-lead SOIC package, while the AD8606AR is a dual-channel operational amplifier supplied in an 8-lead SOIC package. Both are CMOS rail-to-rail input/output amplifiers from Analog Devices with similar per-channel AC and DC specifications, but they differ in channel count and package footprint.
Are the AD8604ARZ and AD8606AR electrically identical on a per-channel basis?
Both devices share the same Analog Devices CMOS rail-to-rail input/output amplifier core family and are specified with comparable per-channel parameters, including low offset voltage, low input bias current, and wide bandwidth. However, designers should verify each datasheet's exact limits, since the AD8604 and AD8606 are separate datasheet documents and some specifications may differ in guaranteed limits or test conditions.
Can the AD8606AR be used as a drop-in replacement for the AD8604ARZ?
No. The AD8604ARZ is a quad amplifier in a 14-lead SOIC package, whereas the AD8606AR is a dual amplifier in an 8-lead SOIC package. The pin counts, pin functions, and PCB land patterns differ, so a direct drop-in substitution is not possible without a board redesign or an appropriate channel-count equivalent.
What supply voltage range do the AD8604ARZ and AD8606AR support?
Both devices are specified for single-supply operation over a low-voltage range and for dual-supply operation. Designers should confirm the exact minimum and maximum supply voltages, as well as the guaranteed operating conditions, from the respective Analog Devices datasheets before finalizing a design.
Do the AD8604ARZ and AD8606AR feature rail-to-rail input and output operation?
Yes. Both the AD8604ARZ and AD8606AR are CMOS rail-to-rail input/output operational amplifiers, allowing input and output signal swings close to the supply rails. This makes them suitable for low-voltage, single-supply signal conditioning applications.
Which applications are better suited to the AD8604ARZ versus the AD8606AR?
The AD8604ARZ, with four channels in a 14-lead SOIC, is suited to multi-channel signal conditioning where board space allows a larger package. The AD8606AR, with two channels in an 8-lead SOIC, is suited to compact dual-channel designs. Selection should be based on required channel count, package size, and the guaranteed specifications in each device's datasheet.
Are the AD8604ARZ and AD8606AR available in the same package type?
Both are offered in SOIC packages, but they are not the same package: the AD8604ARZ uses a 14-lead SOIC and the AD8606AR uses an 8-lead SOIC. The "ARZ" and "AR" suffixes denote the SOIC package and, for the AD8604ARZ, the RoHS-compliant Z grade per Analog Devices ordering conventions.
What should be verified before substituting one device for the other in an existing design?
Verify channel count, package pinout and footprint, supply voltage range, guaranteed offset voltage and drift, input bias current, bandwidth, slew rate, output swing, and operating temperature range against the official Analog Devices datasheets. Because the two parts differ in channel count and package, a substitution typically requires layout changes and revalidation of all critical specifications.