Part A
AD8275ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5361 Stückzahl
- Package
- MSOP-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8275ARMZ and AD8271BRMZ-RL are both precision difference amplifiers in an 8-lead MSOP package, making them a viable functional replacement candidate in many designs. However, the AD8275ARMZ offers a fixed gain of 0.2 with a wider supply range, while the AD8271BRMZ-RL provides a selectable gain of 0.5 or 1.0 and a narrower supply range, so gain configuration and supply headroom must be validated before substitution.
Package Type
High match
Gain Configuration
Validation required
Supply Voltage Range
Validation required
Amplifier Type
High match
Parts at a glance
Part B
AD8271BRMZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9476 Stückzahl
- Package
- MSOP-10
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8275ARMZ | AD8271BRMZ-RL | Why it matters |
|---|---|---|---|
| Amplifier Type | Differential Amplifier | Programmable Gain Difference Amplifier | The core function differs; the AD8271 offers selectable gains, which changes how it can be configured in a signal chain. |
| Number of Channels | 1 | 1 | Both are single-channel devices, so channel count is not a differentiator for substitutability. |
| Gain Configuration | Fixed gain of 0.2 | Programmable (pin-selectable gains) | Fixed versus programmable gain determines whether the part can be adapted to different signal ranges without external components. |
| Supply Voltage Range | 3 V to 15 V (single) / ±1.5 V to ±7.5 V (dual) | 2.7 V to 36 V (single) / ±1.35 V to ±18 V (dual) | A wider supply range allows the AD8271 to operate in higher-voltage systems where the AD8275 cannot. |
| Input Offset Voltage (max) | ±250 µV | ±500 µV | Lower offset voltage improves DC accuracy, which is critical in precision measurement applications. |
| Bandwidth | 15 MHz | 15 MHz | Similar bandwidth means both can handle comparable signal frequencies in the application. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same environmental conditions. |
| Package / Mounting | 8-Lead MSOP (Surface Mount) | 8-Lead MSOP (Surface Mount) | Same package and footprint allow drop-in board replacement without layout changes. |
| Supply Current (typical) | 2.5 mA | 2.5 mA | Comparable quiescent current means similar power budget impact in the system. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8275ARMZ | AD8271BRMZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Amplifier Type | Differential | Programmable Gain |
| Number of Circuits | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 25V/µs | 30V/µs |
| Gain Bandwidth Product | - | 15 MHz |
| Current - Input Bias | - | 500 nA |
| Voltage - Input Offset | 300 µV | 300 µV |
| Supply Current | 1.9mA | 2.3mA |
| Current - Output / Channel | 30 mA | 100 mA |
| Voltage - Supply Span(Min) | 3.3 V | 5 V |
| Voltage - Supply Span(Max) | 15 V | 36 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| -3 dB Bandwidth | 15 MHz | - |
Frequently asked questions
What are the primary functional differences between the AD8275ARMZ and the AD8271BRMZ-RL?
The AD8275ARMZ is a single-channel, low-power, fully differential amplifier/ADC driver with a fixed gain of 0.2 and an internal common-mode reference buffer, optimized for driving 16-bit to 18-bit SAR ADCs. The AD8271BRMZ-RL is a dual-channel, low-distortion, high-speed difference amplifier with a fixed gain of 1 and a bandwidth of 15 MHz, designed for signal conditioning and differential-to-single-ended conversion. The AD8275ARMZ focuses on precision ADC driving with level shifting, while the AD8271BRMZ-RL focuses on wideband differential signal amplification.
Are the AD8275ARMZ and AD8271BRMZ-RL pin-compatible and directly interchangeable?
No. The AD8275ARMZ is supplied in an 8-lead MSOP (RM-8) package, while the AD8271BRMZ-RL is supplied in an 8-lead SOIC (R-8) package. The package footprints, pin assignments, and external component requirements differ, so they are not drop-in replacements for each other. A PCB redesign and validation against the respective datasheets are required before substitution.
What are the gain configurations of the AD8275ARMZ and AD8271BRMZ-RL?
The AD8275ARMZ has a fixed gain of 0.2 (attenuation) with an internal common-mode voltage buffer, intended to scale and level-shift bipolar or single-ended signals to the input range of differential SAR ADCs. The AD8271BRMZ-RL has a fixed gain of 1 (unity) difference amplifier configuration. Neither device provides pin-selectable gain options; gain is fixed by internal resistor networks.
How do the bandwidth and slew rate specifications compare between the two devices?
The AD8275ARMZ has a bandwidth of approximately 15 MHz (at G = 0.2) and a slew rate of about 25 V/µs, suitable for driving medium-speed precision ADCs. The AD8271BRMZ-RL has a bandwidth of 15 MHz (at G = 1) and a slew rate of approximately 30 V/µs. Both are comparable in bandwidth, but the AD8271BRMZ-RL provides higher output swing capability at unity gain, while the AD8275ARMZ is optimized for attenuated, level-shifted ADC driving.
What are the supply voltage and power consumption characteristics of each part?
The AD8275ARMZ operates from a single supply of 3.3 V to 5 V (or dual supplies of ±1.65 V to ±2.5 V) and typically consumes about 2.5 mA of quiescent current. The AD8271BRMZ-RL operates from dual supplies of ±2.5 V to ±15 V (or single supply of 5 V to 30 V) and typically consumes about 2.5 mA per amplifier. The AD8275ARMZ is optimized for low-voltage, single-supply ADC driver applications, while the AD8271BRMZ-RL supports wider supply ranges for higher-voltage signal conditioning.
Which device is better suited for driving high-resolution SAR ADCs?
The AD8275ARMZ is specifically designed as an ADC driver for 16-bit to 18-bit SAR converters. It integrates a level-shifting common-mode buffer and a fixed gain of 0.2, allowing direct interface to differential ADCs with a 0 V to VREF input range from bipolar or single-ended sources. The AD8271BRMZ-RL, while a precision difference amplifier, does not include an integrated common-mode reference buffer and is not specifically characterized as an ADC driver, so the AD8275ARMZ is the preferred choice for high-resolution SAR ADC driving applications.
What are the input offset voltage and drift specifications for the AD8275ARMZ and AD8271BRMZ-RL?
The AD8275ARMZ has a maximum input offset voltage of 250 µV (typical 50 µV) with a typical offset drift of 1 µV/°C. The AD8271BRMZ-RL has a maximum input offset voltage of 500 µV (typical 100 µV) with a typical offset drift of 2 µV/°C. The AD8275ARMZ offers tighter offset and drift performance, which is beneficial for precision ADC driving, while the AD8271BRMZ-RL provides adequate precision for general differential signal conditioning.
What are the operating temperature ranges and package thermal considerations for these devices?
Both the AD8275ARMZ and AD8271BRMZ-RL are specified for the industrial temperature range of −40°C to +85°C. The AD8275ARMZ is housed in an 8-lead MSOP package, while the AD8271BRMZ-RL is housed in an 8-lead SOIC package. The SOIC package of the AD8271BRMZ-RL typically offers lower thermal resistance (θJA) than the MSOP package of the AD8275ARMZ, which may be relevant in high-power or high-temperature environments. Designers should consult the respective datasheets for detailed thermal derating information.