Part A
AD8250ARMZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2665 PCS
- Package
- TFSOP-10
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8251ARMZ and AD8250ARMZ are both programmable gain instrumentation amplifiers from the same AD825x family, sharing a common 10-lead MSOP footprint, SPI-programmable gain control interface, and comparable supply and bandwidth characteristics. The AD8251ARMZ offers a wider gain range (1, 2, 4, 8) versus the AD8250ARMZ (1, 2, 5, 10), so the primary selection criterion is whether the required gain set is covered. Where the target gain values are available in both devices, the AD8251ARMZ is a viable functional replacement candidate, subject to verification of gain-dependent performance in the final application.
Package and Pinout
High match
Gain Configuration
Validation required
Supply Voltage Range
High match
Bandwidth and Slew Rate
Validation required
Parts at a glance
Part B
AD8251ARMZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3742 PCS
- Package
- TFSOP-10
- Series
- Linear - Amplifiers - Instrumentation, 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 | AD8251ARMZ | AD8250ARMZ | Why it matters |
|---|---|---|---|
| Gain Range | 1, 2, 4, 8 (binary) | 1, 2, 5, 10 (decimal) | The gain settings differ, so the two parts are not drop-in replacements when a specific gain value is required by the application. |
| Number of Gain Steps | 4 | 4 | Both provide four digitally selectable gain settings, giving similar flexibility in programmable-gain applications. |
| Input Offset Voltage (max) | ±75 µV | ±75 µV | Matching offset voltage means DC accuracy performance is comparable between the two parts. |
| Gain Bandwidth (G=1) | 12 MHz | 10 MHz | Bandwidth affects the maximum signal frequency the amplifier can handle; the slight difference may matter in wideband signal chains. |
| Supply Voltage Range | ±5 V to ±15 V (dual) | ±5 V to ±15 V (dual) | Identical supply requirements allow either part to operate in the same power rail configuration. |
| Input Bias Current (max) | 20 nA | 20 nA | Similar bias current ensures comparable error contribution when driven from high-impedance sources. |
| CMRR (G=1) | 80 dB | 80 dB | Common-mode rejection determines how well the amplifier rejects interference; equal values indicate similar noise immunity. |
| Package | 10-Lead MSOP | 10-Lead MSOP | Same package and pinout enable direct PCB footprint compatibility between the two devices. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both parts suit the same environmental conditions. |
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 | AD8250ARMZ | AD8251ARMZ |
|---|---|---|
| Series | iCMOS® | iCMOS® |
| Part Status | Active | Active |
| Amplifier Type | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 |
| Output Type | Push-Pull | - |
| Slew Rate | 25V/µs | 30V/µs |
| -3 dB Bandwidth | 10 MHz | 10 MHz |
| Current - Input Bias | 5 nA | 5 nA |
| Voltage - Input Offset | 70 µV | 70 µV |
| Supply Current | 4.1mA | 4.1mA |
| Current - Output / Channel | 37 mA | 37 mA |
| Voltage - Supply Span(Min) | 10 V | 10 V |
| Voltage - Supply Span(Max) | 30 V | 30 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD8251ARMZ and AD8250ARMZ programmable gain instrumentation amplifiers?
Both are JFET-input programmable gain instrumentation amplifiers from Analog Devices in 10-lead MSOP (RMZ) packages. The AD8251 offers digitally selectable gains of 1, 2, 4, and 8, while the AD8250 offers gains of 1, 2, 5, and 10. The AD8251 provides a wider gain range (up to 8) with binary gain steps, whereas the AD8250 provides gains up to 10 with a 1-2-5 sequence. Both share similar architecture, supply range, and pinout family, but gain settings and corresponding bandwidth differ.
Are the AD8251ARMZ and AD8250ARMZ pin-compatible?
Yes. Both devices are offered in the same 10-lead MSOP (RMZ) package and share the same pinout, including the gain-select pins A0 and A1, power supplies, and input/output pins. This allows board-level interchangeability, but the gain truth table differs between the two parts, so the logic levels on A0/A1 must be set according to the specific device's gain table.
What gain settings are available on each device?
The AD8251ARMZ provides digitally programmable gains of 1, 2, 4, and 8 selected via two gain pins (A0, A1). The AD8250ARMZ provides gains of 1, 2, 5, and 10 via the same two gain pins. The gain selection truth tables are documented in the respective Analog Devices datasheets and are not identical, so firmware or logic driving the gain pins must be updated when swapping devices.
Do the AD8251ARMZ and AD8250ARMZ have the same supply voltage and input specifications?
Both devices operate from dual supplies of ±5 V to ±15 V and are specified for operation over the −40 °C to +85 °C temperature range. Both are JFET-input instrumentation amplifiers with high input impedance and low input bias current. However, because the gain settings differ, bandwidth, noise, and gain error specifications vary by gain setting and should be compared at the specific gain of interest using the respective datasheets.
Can the AD8251ARMZ be used as a drop-in replacement for the AD8250ARMZ?
Physically and electrically the devices are pin-compatible, but they are not functionally identical drop-in replacements because their gain settings differ (1/2/4/8 versus 1/2/5/10). A direct substitution requires verifying that the available gain values, bandwidth, and gain accuracy at the required gain meet the application requirements, and updating the gain-select logic accordingly.
Which device should be chosen for applications requiring a gain of 10?
The AD8250ARMZ should be selected, as it provides a gain of 10 as part of its 1, 2, 5, 10 gain set. The AD8251ARMZ has a maximum gain of 8 and cannot be configured for a gain of 10. Conversely, if a gain of 4 or 8 is required, the AD8251ARMZ is the appropriate choice.
Are both devices available in the same package and qualification grade?
Yes. Both the AD8251ARMZ and AD8250ARMZ are offered in the 10-lead MSOP package with the RMZ suffix, and both are specified over the industrial temperature range of −40 °C to +85 °C. Designers should confirm current availability and lifecycle status with Analog Devices or authorized distributors such as DigiKey, Mouser, or TTI before finalizing a design.