Part A
AD8694ARUZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3364 個数
- Package
- TSSOP-14
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Replacement verdict
Not a drop-in replacement
AD8694ARUZ and AD8698ARM-R2 are not functionally interchangeable. The AD8694ARUZ is a quad low-noise CMOS operational amplifier in a TSSOP-14 package, while the AD8698ARM-R2 is a dual precision op-amp in an MSOP-8 package. The differing channel count, package footprint, supply voltage range, and gain-bandwidth characteristics mean the two devices cannot be substituted without a full circuit redesign and board re-layout.
Different channel count
Different package footprint
Different supply voltage range
Different bandwidth characteristics
Parts at a glance
Part B
AD8698ARM-R2
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5361 個数
- Package
- TSSOP-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8694ARUZ | AD8698ARM-R2 | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 4 | 2 | Determines how many independent amplifier channels are available in a single package, directly affecting circuit architecture and channel count. |
| Package / Mounting Type | 14-Lead TSSOP (Surface Mount) | 8-Lead MSOP (Surface Mount) | Footprint and pin count must match the PCB layout; a different package requires a board redesign and cannot be dropped in directly. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the operating supply window; matching ranges ensure compatibility with the same power rail in the target design. |
| Input Offset Voltage (Max) | 2.5 mV | 1 mV | Lower offset improves DC precision; a difference here affects accuracy in sensor and instrumentation signal chains. |
| Gain Bandwidth Product | 10 MHz | 10 MHz | Sets the achievable closed-loop bandwidth; identical GBW supports similar AC performance and filter designs. |
| Input Bias Current (Typ) | 1 pA | 1 pA | Very low CMOS input bias current minimizes errors in high-impedance and photodiode/transimpedance applications. |
| Quiescent Current per Amplifier | 1.25 mA | 1.25 mA | Affects total power budget; matching per-amplifier current keeps power consumption predictable when channel count changes. |
| 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. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8694ARUZ | AD8698ARM-R2 |
|---|---|---|
| Supplier | - | 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 main differences between the AD8694ARUZ and AD8698ARM-R2?
The AD8694ARUZ is a quad, low-noise, rail-to-rail output operational amplifier in a 14-lead TSSOP package, while the AD8698ARM-R2 is a dual, low-noise, rail-to-rail output operational amplifier in an 8-lead MSOP package. The AD8694ARUZ provides four amplifiers per package, whereas the AD8698ARM-R2 provides two amplifiers per package.
Are the AD8694ARUZ and AD8698ARM-R2 pin-compatible?
No. The AD8694ARUZ uses a 14-lead TSSOP package and the AD8698ARM-R2 uses an 8-lead MSOP package. They have different pin counts, package dimensions, and PCB land patterns, so they are not pin-compatible and cannot be directly substituted without a board redesign.
What are the supply voltage ranges for the AD8694ARUZ and AD8698ARM-R2?
Both the AD8694ARUZ and AD8698ARM-R2 operate from a single supply of 2.7 V to 5.5 V, or from dual supplies of ±1.35 V to ±2.75 V, as specified in the Analog Devices datasheets.
How do the noise specifications of the AD8694ARUZ and AD8698ARM-R2 compare?
Both devices are low-noise amplifiers from the same Analog Devices family and share comparable input voltage noise density specifications, typically around 8 nV/√Hz at 1 kHz per the manufacturer datasheet. Designers should confirm the exact noise figure for the specific grade and test conditions in the respective datasheets.
What are the bandwidth specifications of the AD8694ARUZ and AD8698ARM-R2?
Both the AD8694ARUZ and AD8698ARM-R2 have a gain bandwidth product of approximately 10 MHz, as specified in the Analog Devices datasheets. The unity-gain crossover frequency and slew rate should be verified against the datasheet for the specific operating conditions of the target design.
Can the AD8698ARM-R2 be used as a replacement for the AD8694ARUZ in an existing design?
No, not as a direct drop-in replacement. The AD8698ARM-R2 is a dual amplifier in an 8-lead MSOP package, while the AD8694ARUZ is a quad amplifier in a 14-lead TSSOP package. A replacement would require a PCB redesign to accommodate the different package, pinout, and channel count.
What are the operating temperature ranges for the AD8694ARUZ and AD8698ARM-R2?
Both the AD8694ARUZ and AD8698ARM-R2 are specified for the industrial temperature range of −40°C to +125°C, per the Analog Devices datasheets.
What input offset voltage specifications apply to the AD8694ARUZ and AD8698ARM-R2?
Both devices are precision amplifiers with low input offset voltage. The exact maximum input offset voltage should be verified in the respective Analog Devices datasheets for the specific grade, as the AD8694ARUZ and AD8698ARM-R2 share the same amplifier core family and comparable offset specifications.