Part A
AD8275ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5361 PCS
- Package
- MSOP-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8275ARMZ and AD8278BRMZ-RL are both precision difference amplifiers in the same 8-lead MSOP package with identical pinout, making them a viable functional replacement candidate. However, the AD8278BRMZ-RL offers a wider supply range and lower gain error, while the AD8275ARMZ provides a fixed gain of 0.2 with integrated level shifting. Designers should validate gain configuration, supply voltage, and output swing requirements against the target application before substituting.
Package Type
High match
Pin Configuration
High match
Gain Configuration
Validation required
Supply Voltage Range
Validation required
Parts at a glance
Part B
AD8278BRMZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2088 PCS
- Package
- TSSOP-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
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 | AD8278BRMZ-RL | Why it matters |
|---|---|---|---|
| Amplifier Type | Differential Amplifier | Difference Amplifier | Defines the core function; both are difference/differential amplifiers but from different product families with different internal architectures. |
| Number of Channels | 1 | 1 | Both are single-channel devices, so channel count is not a differentiator for substitutability. |
| Gain | 0.2 V/V (fixed) | 0.5 V/V (fixed, B grade) | Fixed gain determines the signal scaling; a different gain directly changes the output voltage for a given input, affecting system calibration. |
| Supply Voltage Range | 3.3 V to 15 V (single), ±1.65 V to ±7.5 V (dual) | 2.7 V to 36 V (single), ±1.35 V to ±18 V (dual) | The wider supply range of the AD8278 allows operation in higher-voltage systems where the AD8275 cannot be used. |
| Input Offset Voltage (max) | ±1.5 mV | ±0.5 mV (B grade) | Lower offset improves DC accuracy; the B-grade AD8278 offers tighter offset, which matters for precision measurement applications. |
| Bandwidth (-3 dB) | 15 MHz | 1 MHz | Bandwidth determines the maximum signal frequency the amplifier can handle; the AD8275 supports much faster signals. |
| Input Bias Current (typ) | 50 nA | 50 nA | Bias current affects errors in high-impedance source applications; both are comparable here. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both support industrial temperature ranges, so environmental compatibility is equivalent. |
| Package / Mounting | 8-Lead MSOP (Surface Mount) | 8-Lead MSOP (Surface Mount) | Identical package and footprint allow drop-in board replacement without layout changes. |
| Output Current (short-circuit) | ±30 mA | ±20 mA | Drive capability affects the ability to drive low-impedance loads or capacitive loads in the signal chain. |
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 | AD8275ARMZ | AD8278BRMZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Amplifier Type | Differential | Differential |
| Number of Circuits | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 25V/µs | 1.4V/µs |
| Gain Bandwidth Product | - | 1 MHz |
| Voltage - Input Offset | 300 µV | 50 µV |
| Supply Current | 1.9mA | 200µA |
| Current - Output / Channel | 30 mA | 15 mA |
| Voltage - Supply Span(Min) | 3.3 V | 2 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 differences between the AD8275ARMZ and AD8278BRMZ-RL?
The AD8275ARMZ is a single-channel, low-power difference amplifier optimized for precision signal conditioning, while the AD8278BRMZ-RL is a dual-channel difference amplifier in an MSOP package supplied on tape and reel. The AD8275ARMZ offers a fixed gain of 0.2 with a wide input common-mode range, whereas the AD8278BRMZ-RL provides a fixed gain of 0.5 per channel. Designers should compare channel count, gain configuration, package footprint, and power consumption against their specific application requirements.
Are the AD8275ARMZ and AD8278BRMZ-RL pin-compatible?
No. The AD8275ARMZ is housed in an 8-lead MSOP package as a single-channel device, while the AD8278BRMZ-RL is a dual-channel device in an 8-lead MSOP package with a different pin function assignment. The pinouts are not interchangeable, and PCB layouts must be designed separately for each part according to the respective manufacturer datasheets.
What are the gain configurations of the AD8275ARMZ and AD8278BRMZ-RL?
The AD8275ARMZ is a fixed-gain difference amplifier with a gain of 0.2, intended for attenuating high-voltage differential signals into the input range of low-voltage ADCs. The AD8278BRMZ-RL is a fixed-gain difference amplifier with a gain of 0.5 per channel. Neither device provides pin-selectable gain options; the gain is internally fixed by the manufacturer's design.
Can the AD8275ARMZ and AD8278BRMZ-RL operate from the same supply voltage?
Both devices support single-supply operation in the range of 2.7 V to 5.5 V and dual-supply operation of ±2.25 V to ±5.5 V, per their respective datasheets. However, the AD8275ARMZ is specified for a supply range of 2.7 V to 5.5 V single supply, while the AD8278BRMZ-RL supports a similar supply range. Always verify the exact supply limits and performance specifications in the latest manufacturer datasheet before finalizing a design.
Which part is better suited for multi-channel signal acquisition?
The AD8278BRMZ-RL is better suited for multi-channel signal acquisition because it integrates two independent difference amplifiers in a single 8-lead MSOP package, reducing board space and component count. The AD8275ARMZ contains only one amplifier channel, so multi-channel systems would require multiple AD8275ARMZ devices, increasing PCB area and bill-of-materials complexity.
What packaging and ordering differences exist between the AD8275ARMZ and AD8278BRMZ-RL?
The AD8275ARMZ is supplied in an 8-lead MSOP package in tube or tray format, while the AD8278BRMZ-RL is supplied in an 8-lead MSOP package on tape and reel, as indicated by the "RL" suffix. The tape-and-reel format of the AD8278BRMZ-RL is intended for automated high-volume pick-and-place assembly, whereas the AD8275ARMZ packaging is typically used for lower-volume or prototype builds.
Do the AD8275ARMZ and AD8278BRMZ-RL have the same input common-mode voltage range?
No. The AD8275ARMZ features an input common-mode voltage range that extends beyond the supply rails, allowing it to handle high-voltage differential signals, while the AD8278BRMZ-RL has a different input common-mode range specified in its datasheet. Designers must verify the exact common-mode limits for each device against the signal levels in their application to avoid clipping or distortion.
Are the AD8275ARMZ and AD8278BRMZ-RL interchangeable in an existing design?
No. The two devices differ in channel count, gain (0.2 vs. 0.5), pinout, and packaging format, so they cannot be dropped into the same PCB footprint without redesign. A substitution requires re-evaluating the signal chain gain, PCB layout, and supply decoupling, and confirming that the replacement part meets the application's accuracy, bandwidth, and power requirements per the manufacturer datasheet.