Part A
AD8041AR
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5370 PCS
- Package
- SOP-8
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Replacement verdict
Compatible functional replacement candidate
The AD8041AR and AD8040AR are both single-channel, voltage-feedback operational amplifiers from Analog Devices in the same 8-lead SOIC package, sharing a broadly similar signal-chain role. However, they differ in key electrical characteristics such as supply voltage range, quiescent current, and bandwidth, so the AD8040AR should be treated as a functional candidate rather than a guaranteed drop-in replacement. Designers should validate supply headroom, dynamic performance, and thermal margins against the target application before substituting.
Amplifier Type and Channel Count
Validation required
Supply Voltage Range
Validation required
Bandwidth and Slew Rate
Validation required
Package and Pin Configuration
High match
Parts at a glance
Part B
AD8040AR
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2786 PCS
- Package
- SOIC-14
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8041AR | AD8040AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 1 | 4 | Channel count determines how many independent signal paths can be processed in one package, directly affecting board layout and channel density. |
| -3 dB Bandwidth | 160 MHz | 125 MHz | Bandwidth sets the maximum signal frequency the amplifier can handle with acceptable gain, critical for high-speed signal conditioning. |
| Slew Rate | 160 V/µs | 100 V/µs | Slew rate limits how fast the output can respond to large signal steps, affecting distortion and settling in fast transient applications. |
| Supply Current per Amplifier | 6.8 mA | 1.5 mA | Quiescent current per amplifier drives total power consumption, which is critical in portable and power-sensitive designs. |
| Input Voltage Noise Density | 9 nV/√Hz | 16 nV/√Hz | Lower input noise improves signal-to-noise ratio in low-level signal amplification, affecting overall system dynamic range. |
| Package Type | 8-Lead SOIC | 14-Lead SOIC | Package footprint and pin count must match the PCB layout; a different package requires board redesign and cannot be a drop-in substitute. |
| Output Current (Typical) | 50 mA | 35 mA | Output drive capability determines the ability to drive low-impedance loads such as cables or ADCs without signal degradation. |
| Supply Voltage Range | 3 V to 12 V | 3 V to 12 V | Operating supply range must cover the system rail voltage; matching ranges allow use in the same power environment. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Temperature range confirms suitability for the target environment and industrial-grade reliability requirements. |
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 | AD8041AR | AD8040AR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| Amplifier Type | Voltage Feedback | General Purpose |
| Number of Circuits | 1 | 4 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 170V/µs | 63V/µs |
| -3 dB Bandwidth | 170 MHz | 125 MHz |
| Current - Input Bias | 1.2 µA | 700 nA |
| Voltage - Input Offset | 2 mV | 1.6 mV |
| Supply Current | 5.8mA | 1.4mA (x4 Channels) |
| Current - Output / Channel | 50 mA | 170 mA |
| Voltage - Supply Span(Min) | 3 V | 2.7 V |
| Voltage - Supply Span(Max) | 12 V | 12 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the AD8041AR and AD8040AR?
The AD8041AR is a single, high-speed operational amplifier with a disable feature, while the AD8040AR is a quad, high-speed operational amplifier. The AD8041AR is supplied in an 8-lead SOIC package, whereas the AD8040AR is supplied in a 14-lead SOIC package. Both are fabricated on Analog Devices' proprietary XFCB process and feature rail-to-rail output swing.
Are the AD8041AR and AD8040AR pin-compatible?
No. The AD8041AR is an 8-lead device and the AD8040AR is a 14-lead device, so they are not pin-compatible and cannot be interchanged on the same PCB footprint without layout changes.
Do the AD8041AR and AD8040AR share the same bandwidth and slew rate specifications?
Yes. Both the AD8041AR and AD8040AR are specified with a -3 dB bandwidth of 160 MHz (G = +1) and a slew rate of 160 V/µs, per Analog Devices datasheets. They also share a 0.1 dB flatness bandwidth of 30 MHz and a settling time to 0.1% of 30 ns.
What is the supply voltage range for the AD8041AR and AD8040AR?
Both devices operate from a single supply of +3 V to +12 V or a dual supply of ±1.5 V to ±6 V, as specified in the Analog Devices datasheets.
How does the disable feature differ between the AD8041AR and AD8040AR?
The AD8041AR includes a TTL/CMOS-compatible disable pin that reduces supply current to approximately 1.5 mA when asserted. The AD8040AR does not provide a disable function; it is a quad amplifier without power-down capability.
What are the typical quiescent supply currents of the AD8041AR and AD8040AR?
The AD8041AR typically draws 6.8 mA per amplifier, while the AD8040AR typically draws 6.8 mA per amplifier as well, resulting in approximately 27.2 mA total for the quad device. These values are from the Analog Devices datasheets.
Can the AD8041AR and AD8040AR drive capacitive loads directly?
Both devices are specified to drive capacitive loads, but stability depends on the load value. Analog Devices datasheets provide typical performance plots for capacitive load drive; a series isolation resistor is generally recommended for larger capacitive loads to maintain stability.
What input bias current and offset voltage do the AD8041AR and AD8040AR specify?
Both the AD8041AR and AD8040AR specify a typical input bias current of 1.2 µA and a typical input offset voltage of 1 mV, with a maximum offset voltage of 6 mV, per the Analog Devices datasheets.