Part A
AD8138ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4208 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Special Purpose
Replacement verdict
Compatible functional replacement candidate
The AD8138ARZ and AD8138AARZ are functionally equivalent differential ADC drivers from Analog Devices, sharing the same core silicon, package, and pinout. The AD8138AARZ is the automotive-grade variant, offering a wider operating temperature range and AEC-Q100 qualification, making it a suitable functional replacement for the AD8138ARZ in automotive and high-reliability applications, while the AD8138ARZ remains appropriate for standard industrial use.
Package Type
High match
Pin Configuration
High match
Operating Temperature Range
Validation required
Automotive Qualification
Validation required
Parts at a glance
Part B
AD8138AARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6293 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Special Purpose
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8138ARZ | AD8138AARZ | Why it matters |
|---|---|---|---|
| Amplifier Type | Differential ADC Driver | Differential ADC Driver | Confirms both parts serve the same core function as a differential driver for ADCs, supporting direct substitution. |
| Number of Circuits | 1 | 1 | Single-channel configuration must match for pin-compatible replacement in a given circuit. |
| Supply Voltage Range | 2.7 V to 11 V (±1.35 V to ±5.5 V) | 2.7 V to 11 V (±1.35 V to ±5.5 V) | Identical supply range ensures the replacement works in the same power rail configuration. |
| -3 dB Bandwidth | 320 MHz | 320 MHz | Matching bandwidth preserves signal fidelity and frequency response in the application. |
| Slew Rate | 1150 V/µs | 1150 V/µs | Equal slew rate ensures identical large-signal transient behavior. |
| Input Offset Voltage | 1 mV (typ) | 1 mV (typ) | Same offset voltage keeps DC accuracy consistent after substitution. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings confirm suitability for the same environmental conditions. |
| Package / Mounting Type | 8-SOIC, Surface Mount | 8-SOIC, Surface Mount | Same package and mounting allow drop-in replacement on the existing PCB footprint. |
| Output Current per Channel | 95 mA | 95 mA | Matching output drive capability ensures the replacement can drive the same load. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8138ARZ | AD8138AARZ |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| Type | ADC Driver | ADC Driver |
| Applications | Data Acquisition | Data Acquisition |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD8138ARZ and AD8138AARZ?
The AD8138ARZ and AD8138AARZ are both differential amplifiers from Analog Devices in an 8-lead SOIC package. The primary difference is the grade and specified temperature range: the AD8138ARZ is specified over the industrial temperature range of −40°C to +85°C, while the AD8138AARZ is specified over the extended automotive temperature range of −40°C to +125°C. Both share the same core electrical specifications at 25°C.
Are the AD8138ARZ and AD8138AARZ pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin assignments, so they are pin-compatible and share the same PCB land pattern.
Can the AD8138AARZ be used as a drop-in replacement for the AD8138ARZ?
In most applications yes, because both parts share the same package, pinout, and core electrical performance. The AD8138AARZ offers a wider specified operating temperature range (−40°C to +125°C), so it can replace the AD8138ARZ where the ambient or junction temperature may exceed +85°C. Verify application-specific requirements against the respective datasheets before substitution.
What is the specified operating temperature range for each part?
The AD8138ARZ is specified over −40°C to +85°C. The AD8138AARZ is specified over −40°C to +125°C, making it suitable for higher-temperature and automotive-grade environments.
Do the AD8138ARZ and AD8138AARZ have the same bandwidth and slew rate?
Yes. Both devices are based on the same AD8138 differential amplifier core, with a −3 dB bandwidth of 320 MHz and a slew rate of 1150 V/µs, as specified in the Analog Devices datasheet.
Are both parts RoHS compliant?
Yes. The "Z" suffix in both AD8138ARZ and AD8138AARZ denotes RoHS-compliant packaging per Analog Devices' ordering guide.
Which part should be selected for automotive or high-temperature designs?
The AD8138AARZ should be selected for designs requiring operation up to +125°C, since its specifications are guaranteed over the extended temperature range. The AD8138ARZ is appropriate for standard industrial applications up to +85°C.