Part A
AD8137YRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3869 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Not a drop-in replacement
The AD8137YRZ and AD8131AR are both differential amplifiers, but they differ fundamentally in output architecture, gain configuration, and package footprint, so the AD8137YRZ cannot serve as a drop-in replacement for the AD8131AR without circuit redesign and validation.
Different output type
Different gain configuration
Different package footprint
Different supply range
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8137YRZ | AD8131AR | Why it matters |
|---|---|---|---|
| Amplifier Type | Differential Amplifier | Differential Line Driver | Defines the primary function; a line driver is optimized for cable driving while a general differential amplifier offers more flexible feedback configuration. |
| -3 dB Bandwidth | 110 MHz | 400 MHz | Higher bandwidth supports faster signal edges and higher-frequency signals; the AD8131AR can handle much higher-speed data. |
| Slew Rate | 450 V/µs | 2000 V/µs | Slew rate limits large-signal high-frequency performance; the AD8131AR slews much faster, better for high-speed pulse and video signals. |
| Supply Voltage Range | 2.7 V to 12 V | ±1.5 V to ±5 V (3 V to 10 V) | Determines compatibility with the system power rail; the AD8137YRZ supports a wider single-supply range including 12 V. |
| Input Offset Voltage (max) | 2.5 mV | 10 mV | Lower offset reduces DC error and improves accuracy in precision signal chains; the AD8137YRZ is more precise. |
| Quiescent Supply Current | 3.2 mA | 11 mA | Affects power budget and thermal load; the AD8137YRZ draws significantly less current for power-sensitive designs. |
| Output Current Drive | Not specified (low power) | 60 mA | Higher output drive allows driving heavier loads and terminated cables; the AD8131AR is better suited for line-driving applications. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package footprint affects PCB layout and drop-in compatibility; both share the same SOIC footprint here. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | Wider temperature range supports harsher environments; the AD8137YRZ is rated for higher ambient temperatures. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8137YRZ | AD8131AR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | Differential | Differential |
| Number of Circuits | 1 | 1 |
| Output Type | Differential, Rail-to-Rail | Differential |
| Slew Rate | 450V/µs | 2000V/µs |
| -3 dB Bandwidth | 110 MHz | 400 MHz |
| Current - Input Bias | 500 nA | 500 nA |
| Voltage - Input Offset | 700 µV | 1.5 mV |
| Supply Current | 3.2mA | 11.5mA |
| Current - Output / Channel | 20 mA | 60 mA |
| Voltage - Supply Span(Min) | 2.7 V | 2.8 V |
| Voltage - Supply Span(Max) | 12 V | 11 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the AD8137YRZ and the AD8131AR?
The AD8137YRZ is a low-power, low-noise differential ADC driver with rail-to-rail output, while the AD8131AR is a fixed-gain (G = 2) high-speed differential driver. The AD8137YRZ offers externally configurable gain and operates on a single 2.7 V to 12 V supply (or ±1.35 V to ±6 V dual supplies), whereas the AD8131AR is optimized for fixed-gain applications with a -3 dB bandwidth of 400 MHz and operates on a single 5 V supply (or ±5 V).
Are the AD8137YRZ and AD8131AR pin-compatible?
No. The AD8137YRZ is supplied in an 8-lead SOIC package, and the AD8131AR is supplied in an 8-lead SOIC package as well, but their pin functions differ. The AD8137YRZ provides access to feedback and gain-setting pins for external resistor configuration, while the AD8131AR has internal fixed-gain resistors and different pin assignments. They are not direct drop-in replacements.
What is the -3 dB bandwidth of each device?
The AD8137YRZ has a -3 dB bandwidth of 110 MHz (G = 1, VOUT = 2 V p-p). The AD8131AR has a -3 dB bandwidth of 400 MHz (G = 2, VOUT = 2 V p-p). The AD8131AR is therefore better suited for higher-frequency signal chains.
How do the supply voltage requirements compare?
The AD8137YRZ operates from a single supply of 2.7 V to 12 V or dual supplies of ±1.35 V to ±6 V. The AD8131AR operates from a single 5 V supply or ±5 V dual supplies. The AD8137YRZ offers greater supply flexibility for low-voltage and wide-range systems.
Which device is better for low-power applications?
The AD8137YRZ is the lower-power option. It typically draws 3.2 mA of quiescent supply current, whereas the AD8131AR typically draws 11 mA. For power-sensitive designs, the AD8137YRZ is preferable.
What is the gain configuration of each part?
The AD8137YRZ uses external resistors to set gain, allowing flexible closed-loop configurations. The AD8131AR has an internally fixed gain of G = 2, which reduces external component count but limits design flexibility.
How does noise performance compare between the AD8137YRZ and AD8131AR?
The AD8137YRZ is specified with an input voltage noise of 8.25 nV/√Hz at 100 kHz. The AD8131AR is specified with an input voltage noise of 5 nV/√Hz at 100 kHz. The AD8131AR provides lower input-referred noise, while the AD8137YRZ is optimized for low power and low distortion in ADC driving applications.
Can the AD8137YRZ and AD8131AR be used interchangeably in an existing design?
No. Because the devices differ in pin function, gain configuration, supply range, bandwidth, and quiescent current, they cannot be used interchangeably without redesigning the circuit and validating performance against the manufacturer datasheets.