Part A
AD8694ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1214 PCS
- Package
- SOIC-14
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8694ARZ and AD8698ARZ share the same quad operational amplifier architecture, SOIC-14 package, and general-purpose signal conditioning role, making the AD8698ARZ a viable functional substitute for the AD8694ARZ in many designs. However, the two devices differ in their specified performance envelopes, so gain-bandwidth, supply voltage range, and thermal limits should be validated against the target application before committing to a drop-in replacement.
Amplifier Architecture
Validation required
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 | AD8694ARZ | AD8698ARZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 4 | 2 | Determines how many independent op-amp channels are available in one package, directly affecting circuit density and channel count. |
| Input Offset Voltage (max) | 400 µV | 75 µV | Lower offset voltage improves DC precision; the AD8698 offers tighter offset for precision signal chains. |
| Input Bias Current (typ) | 1 pA | 0.3 pA | Very low bias current minimizes errors in high-impedance sensor and photodiode front-ends. |
| Gain Bandwidth Product | 10 MHz | 10 MHz | Sets the achievable closed-loop bandwidth and speed of the amplifier in signal-conditioning stages. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines compatibility with single-supply low-voltage systems and battery-powered designs. |
| Quiescent Current per Amplifier (typ) | 1.0 mA | 1.0 mA | Affects total power consumption, especially important in portable and multi-channel designs. |
| Input Voltage Noise Density | 8 nV/√Hz | 8 nV/√Hz | Determines noise floor for low-level signal amplification; lower values improve SNR. |
| Package | 14-Lead SOIC | 8-Lead SOIC | Footprint and pin count differ, so PCB layout and board space must be re-evaluated 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 | AD8694ARZ | AD8698ARZ |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | General Purpose | General Purpose |
| Number of Circuits | 4 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 5V/µs | 0.4V/µs |
| Gain Bandwidth Product | 10 MHz | 1 MHz |
| Current - Input Bias | 1 pA | 700 pA |
| Voltage - Input Offset | 400 µV | 20 µV |
| Supply Current | 950µA (x4 Channels) | 2.8mA |
| Voltage - Supply Span(Min) | 2.7 V | 5 V |
| Voltage - Supply Span(Max) | 6 V | 30 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Current - Output / Channel | 80 mA | - |
Frequently asked questions
What are the key differences between the AD8694ARZ and AD8698ARZ?
The AD8694ARZ is a quad (four-channel) operational amplifier, while the AD8698ARZ is a dual (two-channel) operational amplifier. Both are low-noise, rail-to-rail output CMOS op amps from Analog Devices in a 14-lead SOIC package, but the AD8694ARZ provides four amplifiers per package versus two in the AD8698ARZ.
Are the AD8694ARZ and AD8698ARZ pin-compatible?
No. The AD8694ARZ is a quad op amp in a 14-lead SOIC package, whereas the AD8698ARZ is a dual op amp in an 8-lead SOIC package. The package body widths and pin counts differ, so they are not drop-in replacements for each other on the same PCB footprint.
Do the AD8694ARZ and AD8698ARZ share the same supply voltage range?
Yes. Both devices are specified for operation from 2.7 V to 5.5 V single supply (or ±1.35 V to ±2.75 V dual supply), making them suitable for low-voltage, battery-powered signal conditioning applications.
How do the noise specifications of the AD8694ARZ and AD8698ARZ compare?
Both parts are low-noise CMOS amplifiers with a typical input voltage noise density of approximately 8 nV/√Hz at 1 kHz, so their noise performance is essentially equivalent on a per-amplifier basis.
What is the gain bandwidth product of the AD8694ARZ and AD8698ARZ?
Both the AD8694ARZ and AD8698ARZ offer a typical gain bandwidth product of 10 MHz, supporting wideband signal processing in instrumentation and filter designs.
Can the AD8698ARZ be used where a design previously used the AD8694ARZ?
Only if the design requires no more than two amplifiers and the PCB is redesigned for the 8-lead SOIC footprint. The AD8698ARZ cannot directly replace the AD8694ARZ because of the different channel count and package pinout.
What are the input offset voltage characteristics of the AD8694ARZ and AD8698ARZ?
Both devices feature a low typical input offset voltage of approximately 400 µV, which supports precision DC signal conditioning in sensor and instrumentation front ends.