Part A
AD8276ARMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 1258 個数
- Package
- MSOP-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Replacement verdict
Compatible functional replacement candidate
The AD8276ARMZ and AD8278BRMZ-RL are both precision difference amplifiers in the same SOIC-8 package with identical pinout and gain configuration, making the AD8278BRMZ-RL a viable functional replacement candidate for the AD8276ARMZ in most designs. Designers should validate the tighter gain error and offset specifications of the AD8278BRMZ-RL against their accuracy budget, and confirm that the slightly reduced bandwidth and supply range remain acceptable for the target application before qualifying the substitution.
Package Type
High match
Pin Configuration
High match
Gain and Accuracy
Validation required
Bandwidth and Supply Range
Validation required
Parts at a glance
Part B
AD8278BRMZ-RL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2088 個数
- Package
- TSSOP-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8276ARMZ | AD8278BRMZ-RL | Why it matters |
|---|---|---|---|
| Amplifier Type | Differential Amplifier | Difference Amplifier | Defines the core function; both are difference/differential amplifiers but the AD8276 is a fixed-gain difference amplifier while the AD8278 is a programmable-gain difference amplifier, affecting circuit topology compatibility. |
| Number of Circuits | 1 | 1 | Both are single-channel devices, so channel count is compatible for direct substitution. |
| Gain Configuration | Fixed gain of 1 (unity) | Pin-selectable gains of 0.5, 1, 2 | The AD8278 offers selectable gains while the AD8276 is fixed at unity; this changes the achievable signal scaling and requires different external configuration. |
| Supply Voltage Range | 2.7 V to 36 V (±1.35 V to ±18 V) | 2.7 V to 36 V (±1.35 V to ±18 V) | Identical supply range means both can operate in the same power rails, supporting substitutability in supply design. |
| Input Offset Voltage (max) | ±100 µV (typical grade) | ±150 µV (B grade) | Offset voltage affects DC accuracy; the AD8276 has a tighter offset spec, which matters for precision measurement applications. |
| Bandwidth (-3 dB) | 550 kHz (G = 1) | 1 MHz (G = 1) | Bandwidth determines the maximum signal frequency the amplifier can handle; the AD8278 provides wider bandwidth for higher-speed signals. |
| Input Bias Current | ±50 nA (max) | ±50 nA (max) | Bias current impacts errors in high-impedance source applications; identical values indicate similar performance in this regard. |
| CMRR (min) | 86 dB (G = 1) | 86 dB (G = 1) | Common-mode rejection ratio determines rejection of unwanted common-mode signals; matching values support equivalent noise immunity. |
| Package / Mounting | 8-Lead MSOP (Surface Mount) | 8-Lead MSOP (Surface Mount) | Identical package and footprint allow drop-in PCB compatibility without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ranges ensure both parts suit the same environmental conditions and industrial applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8276ARMZ | 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 | 1.1V/µs | 1.4V/µs |
| Gain Bandwidth Product | 550 kHz | 1 MHz |
| Voltage - Input Offset | 100 µV | 50 µV |
| Supply Current | 200µA | 200µA |
| Current - Output / Channel | 15 mA | 15 mA |
| Voltage - Supply Span(Min) | 2 V | 2 V |
| Voltage - Supply Span(Max) | 36 V | 36 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the AD8276ARMZ and the AD8278BRMZ-RL?
The AD8276ARMZ is a unity-gain difference amplifier with a fixed gain of 1, while the AD8278BRMZ-RL is a difference amplifier with a fixed gain of 0.5. Both are manufactured by Analog Devices and are available in 8-lead MSOP packages, but they differ in gain configuration, input voltage range, and output swing characteristics.
Are the AD8276ARMZ and AD8278BRMZ-RL pin-compatible?
Yes, both devices are offered in the same 8-lead MSOP (RM) package and share the same pinout, allowing for a common PCB footprint. However, designers must verify that the gain difference and electrical specifications meet the requirements of the target application before substituting one for the other.
What is the gain configuration of each device?
The AD8276ARMZ is a unity-gain (G = 1) difference amplifier. The AD8278BRMZ-RL is a difference amplifier with a fixed gain of 0.5 (G = 0.5). This difference directly affects the output signal amplitude for a given differential input voltage.
What are the supply voltage ranges for the AD8276ARMZ and AD8278BRMZ-RL?
Both devices operate from a single supply of 2.7 V to 36 V or from dual supplies of ±2.7 V to ±18 V, according to the Analog Devices datasheets. This wide supply range supports use in both low-voltage and industrial signal-conditioning applications.
How do the input common-mode voltage ranges compare?
The AD8276ARMZ features an input common-mode voltage range that extends from −VS − 0.1 V to +VS − 1 V (referenced to the supply rails), while the AD8278BRMZ-RL has a similar rail-to-rail input common-mode range. Designers should consult the respective datasheets for the exact limits under their specific supply and temperature conditions.
What are the typical bandwidth specifications for these two amplifiers?
The AD8276ARMZ has a typical −3 dB bandwidth of 550 kHz at G = 1, while the AD8278BRMZ-RL has a typical −3 dB bandwidth of 1 MHz at G = 0.5. The higher bandwidth of the AD8278BRMZ-RL is consistent with its lower gain configuration.
Can the AD8276ARMZ and AD8278BRMZ-RL be used in high-voltage industrial applications?
Yes, both devices are specified for operation with supply voltages up to ±18 V (36 V total) and are designed for precision signal conditioning in industrial, instrumentation, and motor-control applications. Their rail-to-rail output and wide common-mode input range make them suitable for high-voltage sensing tasks.
What are the key package and ordering differences between the two part numbers?
The AD8276ARMZ is supplied in an 8-lead MSOP tube or tray format, while the AD8278BRMZ-RL is supplied in an 8-lead MSOP tape-and-reel format (the "RL" suffix indicates reel packaging). Both are RoHS-compliant and specified over the −40 °C to +85 °C industrial temperature range.