Part A
AD817AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2887 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Not a drop-in replacement
The AD817AR and AD8170ARZ-RL are not functionally interchangeable: the AD817AR is a single high-speed voltage-feedback operational amplifier, while the AD8170ARZ-RL is a two-channel multiplexer-amplifier with an integrated output switch. Their differing channel count, internal topology, and pin function make direct substitution impractical without circuit redesign.
Different channel count
Different internal topology
Different pin function
Different application role
Parts at a glance
Part B
AD8170ARZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4199 PCS
- Package
- SOIC-8
- Series
- Interface - Specialized
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD817AR | AD8170ARZ-RL | Why it matters |
|---|---|---|---|
| Amplifier Type | General Purpose Voltage Feedback Op Amp | Multiplexer Amplifier (2:1 Mux Amp) | The core function differs: one is a standalone op amp, the other integrates a 2:1 multiplexer, so they are not direct functional substitutes. |
| Number of Channels | 1 | 2 (multiplexed inputs, single output) | Channel count determines how many signal paths can be handled; the mux amp switches between two inputs while the op amp handles one. |
| -3 dB Bandwidth | 50 MHz | 250 MHz | Bandwidth sets the maximum signal frequency the device can pass with acceptable gain; the mux amp is significantly faster. |
| Slew Rate | 350 V/µs | 1000 V/µs | Slew rate limits large-signal transient response; higher slew rate supports faster, larger voltage swings without distortion. |
| Supply Voltage Range | ±5 V to ±15 V (dual) | ±5 V to ±5.5 V (dual) | The available supply range affects compatibility with system rails and maximum output swing; the mux amp has a narrower supply window. |
| Input Offset Voltage (max) | 2 mV | 5 mV | Offset voltage contributes DC error at the output; lower offset improves precision in DC-coupled signal chains. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Package compatibility affects PCB footprint and assembly; both share the same SOIC-8 footprint here. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range defines the environments where the part is guaranteed to meet specifications; both cover the industrial range. |
| Supply Current (typical) | 7.5 mA | 7.5 mA | Quiescent current impacts power budget and thermal design; comparable current draw eases power planning. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD817AR | AD8170ARZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Obsolete | Active |
| Applications | - | Multiplexer with Amplifier |
| Voltage - Supply | - | ±4V ~ 6V |
| Amplifier Type | General Purpose | - |
| Number of Circuits | 1 | - |
| Slew Rate | 350V/µs | - |
| Gain Bandwidth Product | 50 MHz | - |
| -3 dB Bandwidth | 50 MHz | - |
| Current - Input Bias | 3.3 µA | - |
| Voltage - Input Offset | 500 µV | - |
| Supply Current | 7mA | - |
| Current - Output / Channel | 50 mA | - |
| Voltage - Supply Span(Min) | 5 V | - |
| Voltage - Supply Span(Max) | 36 V | - |
| Operating Temperature | -40°C ~ 85°C | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
Are the AD817AR and AD8170ARZ-RL the same type of component?
No. The AD817AR is a high-speed, low-power operational amplifier from Analog Devices, while the AD8170ARZ-RL is a high-speed, 8-lead SOIC video multiplexer/amplifier (a 2:1 multiplexer with an integrated output amplifier) from Analog Devices. They are functionally different devices despite similar part-number prefixes.
What are the key differences in function between the AD817AR and AD8170ARZ-RL?
The AD817AR is a general-purpose voltage-feedback op amp intended for signal amplification, buffering, and active filtering. The AD8170ARZ-RL is a 2:1 analog multiplexer with an internal output amplifier, designed for switching between two video or high-speed signal sources. The AD8170ARZ-RL includes a logic-select input for channel selection, which the AD817AR does not have.
Do the AD817AR and AD8170ARZ-RL use the same package and pinout?
No. The AD817AR is supplied in an 8-lead SOIC package with a standard single op-amp pinout (offset null, inputs, supply, output). The AD8170ARZ-RL is supplied in an 8-lead SOIC package but with a multiplexer-specific pinout including channel-select and enable logic pins. The pin functions are not interchangeable, so the PCB land patterns and connections differ.
Can the AD817AR be used as a direct drop-in replacement for the AD8170ARZ-RL?
No. Because the AD8170ARZ-RL integrates a 2:1 multiplexer and logic control that the AD817AR lacks, and because the pinouts differ, the AD817AR cannot directly replace the AD8170ARZ-RL in a circuit. Any substitution would require redesign of the signal path and control logic, validated against the respective datasheets.
What supply voltage ranges do the AD817AR and AD8170ARZ-RL support?
Both devices are specified for operation on dual supplies of ±5 V to ±15 V (or equivalent single-supply rails within that total range), per their Analog Devices datasheets. Designers should confirm the exact recommended operating conditions and absolute maximum ratings in the respective datasheets before use.
Are the AD817AR and AD8170ARZ-RL suitable for video signal processing?
The AD8170ARZ-RL is specifically designed as a video multiplexer/amplifier with wide bandwidth and fast switching, making it suited to video signal routing. The AD817AR is a high-speed op amp with wide bandwidth that can be used in video amplification and buffering stages, but it does not provide multiplexing. Selection depends on whether channel switching is required.
What bandwidth and slew-rate class do these devices belong to?
Both are high-speed analog devices from Analog Devices. The AD817AR is a high-speed op amp with wide unity-gain bandwidth and fast slew rate suitable for video and signal-processing applications. The AD8170ARZ-RL is a wide-bandwidth video multiplexer/amplifier designed for high-speed signal switching. Exact bandwidth and slew-rate figures should be taken from the official Analog Devices datasheets for each part.
Which part should be chosen for a design requiring signal source selection?
For designs requiring selection between two signal sources, the AD8170ARZ-RL is the appropriate choice because it integrates a 2:1 multiplexer with a logic-select input and output amplifier. The AD817AR, being a single op amp, would require external switching circuitry to achieve the same function.