Part A
AD8397ARDZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5995 個数
- Package
- SOIC-8
- 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
The AD8397ARDZ and AD8391AR are not drop-in replacements for one another. The AD8397ARDZ is a dual high-output-current voltage feedback amplifier in an 8-lead SOIC package, while the AD8391AR is a single low power amplifier in an 8-lead SOIC package. Their channel count, supply voltage range, output drive capability, and quiescent current differ substantially, so circuit redesign and validation are required before substitution.
Different channel count
Different output drive
Different supply range
Different quiescent current
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8397ARDZ | AD8391AR | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 1 | A dual amplifier provides two independent channels in one package, while a single amplifier serves only one channel; this affects channel count and board layout. |
| Supply Voltage Range | 3 V to 24 V (±1.5 V to ±12 V) | 3 V to 12 V (±1.5 V to ±6 V) | The wider supply range of the AD8397 allows operation at higher rail voltages, which is critical for high-voltage signal swings and compatibility with the target system rails. |
| -3 dB Bandwidth | 69 MHz | 18 MHz | Bandwidth determines the maximum signal frequency the amplifier can handle with acceptable gain; the AD8397 supports much higher-frequency signals. |
| Slew Rate | 53 V/µs | 25 V/µs | Slew rate limits how fast the output can respond to large signal changes; higher slew rate supports faster, larger-amplitude signals without distortion. |
| Output Current (Peak) | 310 mA | 100 mA | Higher output current capability allows the amplifier to drive lower-impedance loads, which is important for line driving and power applications. |
| Input Voltage Noise Density | 4.5 nV/√Hz | 6 nV/√Hz | Lower input noise improves signal-to-noise ratio in low-level signal applications; the AD8397 offers slightly better noise performance. |
| Package | 8-Lead SOIC (EP) | 8-Lead SOIC | The exposed pad on the AD8397 package aids thermal dissipation for its higher output current, while the standard SOIC of the AD8391 has different thermal characteristics. |
| Quiescent Supply Current | 11 mA (typical, both amplifiers) | 5.5 mA (typical) | Quiescent current affects power consumption; the dual AD8397 draws more total current, which impacts thermal and power budget design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8397ARDZ | AD8391AR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | - | Driver |
| Protocol | - | xDSL |
| Number of Drivers/Receivers | - | 2/0 |
| Voltage - Supply | - | 3V ~ 12V |
| Mounting Type | Surface Mount | Surface Mount |
| Amplifier Type | Voltage Feedback | - |
| Number of Circuits | 2 | - |
| Output Type | Rail-to-Rail | - |
| Slew Rate | 53V/µs | - |
| Gain Bandwidth Product | 35 MHz | - |
| -3 dB Bandwidth | 69 MHz | - |
| Current - Input Bias | 200 pA | - |
| Voltage - Input Offset | 1 mV | - |
| Supply Current | 11mA | - |
| Current - Output / Channel | 310 mA | - |
| Voltage - Supply Span(Min) | 3 V | - |
| Voltage - Supply Span(Max) | 24 V | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the primary differences between the AD8397ARDZ and the AD8391AR?
The AD8397ARDZ is a dual, high output current, voltage feedback operational amplifier supplied in an 8-lead SOIC package (RDZ suffix), while the AD8391AR is a single, high output current operational amplifier supplied in an 8-lead SOIC package. The AD8397ARDZ integrates two amplifiers per package, whereas the AD8391AR contains one amplifier per package.
Are the AD8397ARDZ and AD8391AR pin-compatible?
No. The AD8397ARDZ is a dual amplifier in an 8-lead SOIC, and the AD8391AR is a single amplifier in an 8-lead SOIC. Their pin functions and internal circuit configurations differ, so they are not direct drop-in replacements for one another.
What are the supply voltage ranges for the AD8397ARDZ and AD8391AR?
Both devices are designed for operation on a wide supply range. The AD8397ARDZ operates from a single supply of approximately 3 V to 24 V (or dual supplies of ±1.5 V to ±12 V), and the AD8391AR operates from a single supply of approximately 3 V to 24 V (or dual supplies of ±1.5 V to ±12 V). Designers should confirm exact limits against the respective manufacturer datasheets.
Which device is better suited for driving heavy loads such as ADSL line interfaces?
Both the AD8397ARDZ and AD8391AR are high output current amplifiers intended for driving demanding loads. The AD8397ARDZ provides two high current amplifiers in one package, which can be advantageous for differential line driver configurations, while the AD8391AR provides a single high current amplifier. Selection depends on the number of amplifier channels required by the application.
Do the AD8397ARDZ and AD8391AR share the same package type?
Both are offered in 8-lead SOIC packages, but the AD8397ARDZ is a dual amplifier and the AD8391AR is a single amplifier. The package outline is similar, but the internal channel count and pin assignments differ, so PCB layouts are not interchangeable without verification.
Can the AD8391AR be used as a substitute for one channel of the AD8397ARDZ?
Functionally, the AD8391AR is a single high output current amplifier and the AD8397ARDZ contains two such amplifiers. However, substitution requires verifying supply voltage, quiescent current, bandwidth, output current, and pin configuration against the target design. A direct substitution is not recommended without full validation against both datasheets.
What are the key AC specifications to compare between the AD8397ARDZ and AD8391AR?
Designers should compare gain bandwidth product, slew rate, and settling time from the respective datasheets. Both are high output current amplifiers, but their AC performance figures differ because one is a dual device and the other is a single device. Exact values must be taken from the official manufacturer datasheets rather than assumed.