Part A
AD812AR
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5743 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Video Amps and Modules
Replacement verdict
Not a drop-in replacement
The AD812AR and AD8129AR-REEL7 are not drop-in replacements for one another. Although both are analog video amplifiers in SOIC-8 packages, they differ in channel count, supply voltage range, and input bias current, and the AD8129AR-REEL7 is supplied only in reel packaging. Each of the four key viewpoints shows a low match, so a direct substitution is not recommended without circuit redesign and validation.
Different channel count
Different supply voltage range
Different input bias current
Different packaging format
Parts at a glance
Part B
AD8129AR-REEL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2926 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD812AR | AD8129AR-REEL7 | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (Dual) | 1 (Single) | Channel count determines how many independent signal paths can be processed; a dual cannot directly replace a single in a one-channel layout without unused circuitry. |
| Amplifier Type / Function | Current Feedback (CFB) video op amp | Low noise voltage feedback differential receiver amplifier | The feedback topology and intended function differ fundamentally, so the two parts are not functionally interchangeable in the same circuit. |
| -3 dB Bandwidth | 145 MHz (G = +2) | 200 MHz (G = +10) | Bandwidth sets the maximum signal frequency the amplifier can pass; the specified gain conditions differ, affecting usable frequency range. |
| Slew Rate | 1600 V/µs | 1100 V/µs | Slew rate limits how fast the output can respond to large signal steps; lower slew rate can cause distortion on fast, large-amplitude signals. |
| Input Voltage Noise | 3.5 nV/√Hz | 4.5 nV/√Hz | Lower input noise improves signal-to-noise ratio in low-level signal applications; the difference affects sensitivity in precision front ends. |
| Supply Voltage Range | ±2.5 V to ±15 V (dual supply) | ±5 V to ±12 V (dual supply) | The allowable supply range must match the system rails; a narrower range restricts where the part can be safely operated. |
| Supply Current per Amplifier | ~5.5 mA (per amplifier) | ~6 mA (single amplifier) | Quiescent current affects power budget and thermal design, especially in multi-channel or battery-powered systems. |
| Package | 8-Lead SOIC (SOIC-8) | 8-Lead SOIC (SOIC-8), tape and reel | Package and pinout must match for board-level drop-in compatibility; both share SOIC-8 but differ in channel function and pin assignment. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the application environment; identical ratings here mean thermal suitability is equivalent. |
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 | AD812AR | AD8129AR-REEL7 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| Amplifier Type | - | Differential |
| Number of Circuits | 2 | 1 |
| Slew Rate | 1600V/µs | 1070V/µs |
| -3 dB Bandwidth | 145 MHz | 200 MHz |
| Current - Input Bias | - | 500 nA |
| Voltage - Input Offset | - | 200 µV |
| Supply Current | 4.5 mA | 13mA |
| Current - Output / Channel | 50 mA | 40 mA |
| Voltage - Supply Span(Min) | - | 4.5 V |
| Voltage - Supply Span(Max) | - | 25.2 V |
| Operating Temperature | - | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Applications | Current Feedback | - |
| Voltage - Supply, Single/Dual (±) | 2.4V ~ 36V, ±1.2V ~ 18V | - |
Frequently asked questions
Are the AD812AR and AD8129AR-REEL7 interchangeable in an existing design?
No. The AD812AR is a dual, current-feedback operational amplifier, while the AD8129AR-REEL7 is a single, low-power, high-speed voltage-feedback amplifier. They differ in channel count, feedback architecture, pinout, and package, so they are not direct substitutes.
What are the key architectural differences between the AD812AR and AD8129AR-REEL7?
The AD812AR is a dual current-feedback amplifier optimized for high slew rate and wide bandwidth in video and signal-processing applications. The AD8129AR-REEL7 is a single voltage-feedback amplifier designed for low power consumption and high speed, making it suitable for portable and battery-powered systems.
Do the AD812AR and AD8129AR-REEL7 use the same package and pinout?
No. The AD812AR is supplied in an 8-lead SOIC package containing two amplifiers, while the AD8129AR-REEL7 is supplied in an 8-lead SOIC package containing a single amplifier. The pin functions and internal connections differ, so PCB layouts are not compatible.
How do the supply voltage and power requirements compare between the two parts?
Both devices operate from dual supplies typically in the ±5 V to ±15 V range, but the AD8129AR-REEL7 is specifically characterized for low power consumption, drawing significantly less quiescent current per amplifier than the AD812AR. Designers should consult the respective datasheets for exact quiescent current and supply range specifications.
Which part is better suited for video signal processing applications?
The AD812AR, with its dual current-feedback architecture, high slew rate, and wide bandwidth, is generally preferred for video and high-speed signal-processing applications. The AD8129AR-REEL7, being a single low-power voltage-feedback amplifier, is better suited to power-sensitive, lower-channel-count designs.
Can the AD8129AR-REEL7 replace one channel of the AD812AR in a dual-amplifier circuit?
Not directly. Because the two devices use different feedback topologies (voltage-feedback versus current-feedback) and have different pinouts, replacing one channel of the AD812AR with an AD8129AR-REEL7 requires circuit redesign, including feedback network recalculation and PCB re-layout.
What does the REEL7 suffix indicate on the AD8129AR-REEL7?
The REEL7 suffix indicates that the AD8129AR-REEL7 is supplied in tape-and-reel packaging with 7-inch reels, intended for automated high-volume assembly. The AD812AR is typically supplied in tube or standard packaging, so ordering and handling formats differ.