Part A
AD8138ARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4208 PCS
- Package
- SOIC-8
- Series
- Amplificateur linéaire - spécial
Replacement verdict
Compatible functional replacement candidate
The AD8137YRZ and AD8138ARZ are both differential ADC drivers in the same SOIC-8 package, but they are not identical drop-in substitutes. The AD8137YRZ is a lower-power, lower-bandwidth solution, while the AD8138ARZ offers higher bandwidth and a wider supply range. Designers should validate gain, bandwidth, and supply headroom against the target application before substituting one for the other.
Bandwidth
Validation required
Supply Voltage Range
Validation required
Package Type
High match
Quiescent Current
Validation required
Parts at a glance
Part B
AD8137YRZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3869 PCS
- Package
- SOIC-8
- 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 | AD8137YRZ | AD8138ARZ | Why it matters |
|---|---|---|---|
| Amplifier Type | Differential ADC Driver | Differential ADC Driver | Both are differential ADC drivers, so the core function is the same, but the specific architecture and optimization differ. |
| -3 dB Bandwidth | 110 MHz | 320 MHz | Higher bandwidth supports faster signal processing and higher sampling rates; the AD8138 offers significantly more bandwidth. |
| Slew Rate | 450 V/µs | 1150 V/µs | Slew rate limits large-signal high-frequency performance; the AD8138 can handle faster transients. |
| Input Voltage Noise | 8.25 nV/√Hz | 5 nV/√Hz | Lower input noise improves SNR in sensitive signal chains; the AD8138 provides lower noise. |
| Supply Voltage Range | 2.7 V to 12 V | 3 V to 11 V | Determines compatibility with system power rails; the AD8137 supports lower minimum supply voltage. |
| Quiescent Supply Current | 3.2 mA | 4.5 mA | Lower quiescent current reduces power consumption; the AD8137 is more power-efficient. |
| Output Voltage Swing | Rail-to-rail output | Not rail-to-rail | Rail-to-rail output maximizes dynamic range on low supply voltages; the AD8137 offers wider output swing. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility affects PCB layout and drop-in replacement; both use the same SOIC footprint. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | Wider temperature range suits harsher environments; the AD8137 is rated for higher ambient temperatures. |
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 | AD8138ARZ | AD8137YRZ |
|---|---|---|
| Part Status | Active | Active |
| Type | ADC Driver | - |
| Applications | Data Acquisition | - |
| Mounting Type | Surface Mount | Surface Mount |
| Amplifier Type | - | Differential |
| Number of Circuits | - | 1 |
| Output Type | - | Differential, Rail-to-Rail |
| Slew Rate | - | 450V/µs |
| -3 dB Bandwidth | - | 110 MHz |
| Current - Input Bias | - | 500 nA |
| Voltage - Input Offset | - | 700 µV |
| Supply Current | - | 3.2mA |
| Current - Output / Channel | - | 20 mA |
| Voltage - Supply Span(Min) | - | 2.7 V |
| Voltage - Supply Span(Max) | - | 12 V |
| Operating Temperature | - | -40°C ~ 125°C |
Frequently asked questions
What are the primary differences between the AD8137YRZ and AD8138ARZ?
The AD8137YRZ is a low-power, low-cost differential amplifier with a 100 MHz bandwidth and 450 V/µs slew rate, while the AD8138ARZ is a higher-performance differential amplifier with a 320 MHz bandwidth and 1150 V/µs slew rate. The AD8138ARZ also offers lower harmonic distortion and is optimized for driving high-resolution ADCs, whereas the AD8137YRZ targets power-sensitive applications.
Are the AD8137YRZ and AD8138ARZ pin-compatible?
Both devices are offered in 8-lead SOIC packages with the same pinout, so they are pin-compatible. However, designers must verify supply voltage, gain configuration, and external component values against each datasheet before substituting one for the other.
What are the supply voltage ranges for the AD8137YRZ and AD8138ARZ?
The AD8137YRZ operates from a single 2.7 V to 12 V supply or dual ±1.35 V to ±6 V supplies. The AD8138ARZ operates from a single 3 V to 11 V supply or dual ±1.5 V to ±5.5 V supplies. Both support differential signal processing within these ranges.
Which device is better suited for driving high-resolution ADCs?
The AD8138ARZ is generally preferred for driving high-resolution ADCs because of its higher bandwidth (320 MHz), faster slew rate (1150 V/µs), and lower harmonic distortion, which help preserve ADC dynamic performance. The AD8137YRZ is more appropriate when lower power consumption is the dominant requirement.
How do the power consumption figures compare between the AD8137YRZ and AD8138ARZ?
The AD8137YRZ is designed for low power and typically draws about 3.2 mA per amplifier, while the AD8138ARZ typically draws about 20 mA per amplifier. The lower quiescent current of the AD8137YRZ makes it preferable for battery-powered or power-constrained designs.
What are the bandwidth and slew rate specifications for each device?
The AD8137YRZ has a −3 dB bandwidth of 100 MHz and a slew rate of 450 V/µs. The AD8138ARZ has a −3 dB bandwidth of 320 MHz and a slew rate of 1150 V/µs. These differences make the AD8138ARZ better suited for higher-frequency signal chains.
Can the AD8137YRZ and AD8138ARZ be used in single-supply applications?
Yes, both devices support single-supply operation. The AD8137YRZ operates from 2.7 V to 12 V single supply, and the AD8138ARZ operates from 3 V to 11 V single supply. Proper input common-mode and output swing headroom must be observed in each case.
What package options are available for the AD8137YRZ and AD8138ARZ?
Both the AD8137YRZ and AD8138ARZ are available in 8-lead SOIC packages. The "RZ" suffix in both part numbers denotes the RoHS-compliant SOIC package option from Analog Devices.