Part A
AD818AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2866 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Video Amps and Modules
Replacement verdict
Not a drop-in replacement
The AD818AR and AD8180ARZ-RL are not functionally interchangeable. The AD818AR is a single-channel voltage-feedback operational amplifier, while the AD8180ARZ-RL is a high-speed analog multiplexer with a different internal architecture, pinout, and signal path. Substituting one for the other would require a complete circuit redesign and is not recommended.
Different device function
Different channel count
Different pinout
Different signal path
Parts at a glance
Part B
AD8180ARZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2817 PCS
- Package
- SOIC-8
- Series
- Interface - Analog Switches - Special Purpose
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD818AR | AD8180ARZ-RL | Why it matters |
|---|---|---|---|
| Function / Device Type | Video operational amplifier (single) | Video multiplexer (2:1, high-speed) | These are fundamentally different device classes; one is an amplifier and the other is a multiplexer, so they are not functionally interchangeable in a circuit. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Package compatibility determines whether the part can be placed on the same PCB footprint; both share SOIC-8 but differ in internal function. |
| -3 dB Bandwidth | 130 MHz (typical, G=+2) | 750 MHz (typical) | Bandwidth defines the maximum signal frequency the device can pass with acceptable attenuation, critical for video and high-speed signal chains. |
| Slew Rate | 500 V/µs | 1100 V/µs | Slew rate limits how fast the output can respond to large signal transitions, affecting distortion and settling in fast switching applications. |
| Supply Voltage Range | ±5 V to ±15 V (dual supply) | ±5 V (dual supply) | The allowable supply range constrains system power design; the amplifier supports a wider range while the mux is fixed at ±5 V. |
| Number of Channels / Inputs | 1 amplifier channel | 2 inputs, 1 output (2:1 mux) | Channel count and input configuration determine signal routing capability; a mux selects between inputs while an amplifier only buffers one signal. |
| Control / Logic Interface | None (fixed gain amplifier) | TTL/CMOS-compatible select pin | A logic-select input allows dynamic signal switching, a capability absent in a fixed amplifier, affecting system architecture. |
| Output Current / Drive | 50 mA (typical output drive) | Not specified as amplifier drive (mux output) | Output drive capability affects the ability to drive cables and loads; the amplifier is specified for drive while the mux is characterized for switching. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Temperature range confirms environmental compatibility for industrial and commercial applications; both share the same range. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD818AR | AD8180ARZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Obsolete | Active |
| Applications | Voltage Feedback | Video |
| Multiplexer / Demultiplexer Circuit | - | 2:1 |
| Number of Channels | - | 1 |
| Voltage - Supply, Dual (V±) | - | ±4V ~ 6V |
| -3 dB Bandwidth | 130 MHz | 930MHz |
| Features | - | Buffered |
| Operating Temperature | - | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Circuits | 1 | - |
| Slew Rate | 500V/µs | - |
| Supply Current | 7 mA | - |
| Current - Output / Channel | 50 mA | - |
| Voltage - Supply, Single/Dual (±) | 5V ~ 36V, ±2.5V ~ 18V | - |
Frequently asked questions
Are the AD818AR and AD8180ARZ-RL functionally interchangeable?
No. The AD818AR is a single high-speed voltage-feedback operational amplifier, while the AD8180ARZ-RL is a high-speed 2:1 analog multiplexer. They are different functional blocks and cannot be substituted for one another in a design.
What are the key differences in function between the AD818AR and AD8180ARZ-RL?
The AD818AR is a single op amp intended for signal amplification and buffering, whereas the AD8180ARZ-RL is a 2:1 multiplexer that selects between two analog input signals and routes the selected signal to a common output. Their pinouts and internal architectures differ accordingly.
Do the AD818AR and AD8180ARZ-RL share the same package and pinout?
No. The AD818AR is supplied in an 8-lead SOIC package, and the AD8180ARZ-RL is supplied in a 14-lead SOIC package. The pin counts and pin functions differ, so the PCB land patterns are not compatible.
Can the AD8180ARZ-RL be used to replace an AD818AR in an existing amplifier circuit?
No. The AD8180ARZ-RL is a multiplexer, not an operational amplifier, and it does not provide the closed-loop amplification function of the AD818AR. Replacing an op amp with a multiplexer would not preserve circuit behavior.
Are both parts specified for high-speed signal-chain applications?
Yes. Both the AD818AR and AD8180ARZ-RL are high-speed analog components intended for signal-processing paths such as video and instrumentation systems, but they serve different roles within those signal chains (amplification versus signal selection).
Does the AD8180ARZ-RL require external control logic that the AD818AR does not?
Yes. The AD8180ARZ-RL includes a select control input to choose between its two analog inputs, which must be driven by external logic. The AD818AR, as an operational amplifier, has no such select control input.
Should a design migration between these two parts be treated as a drop-in replacement?
No. Because the devices differ in function, package, pin count, and external control requirements, any migration must be treated as a redesign and validated against the manufacturer datasheets for both the AD818AR and AD8180ARZ-RL.