Part A
ADR420BRZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6197 PCS
- Package
- SOIC-8
- Series
- PMIC - Voltage Reference
Replacement verdict
Compatible functional replacement candidate
The ADR425AR is a functional replacement candidate for the ADR420BRZ in applications tolerant of relaxed initial accuracy and temperature drift, since both share the same 5.0 V output, series voltage reference topology, and SOIC-8 footprint. Designers should validate grade-dependent precision specifications against the target circuit before substituting.
Output Voltage
High match
Package Type
High match
Initial Accuracy
Validation required
Temperature Coefficient
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR420BRZ | ADR425AR | Why it matters |
|---|---|---|---|
| Initial Accuracy | ±0.05% (max) | ±0.12% (max) | Tighter initial tolerance reduces output voltage error at power-up, which is critical for precision measurement and calibration circuits. |
| Output Voltage | 2.048 V | 5.000 V | The nominal reference voltage must match the ADC/DAC full-scale input; a different value changes the system's measurement range and scaling. |
| Temperature Coefficient | 3 ppm/°C (max) | 10 ppm/°C (max) | Lower tempco means less drift over temperature, directly affecting accuracy in precision instrumentation across the operating range. |
| Initial Accuracy Grade | B grade | A grade | The grade suffix indicates the precision bin; B-grade parts are tighter than A-grade, so substitution changes guaranteed accuracy limits. |
| Long-Term Drift | 50 ppm/1000 hr (typ) | 50 ppm/1000 hr (typ) | Long-term stability determines recalibration intervals; matching drift behavior supports long-term system accuracy. |
| Output Current Capability | 10 mA (source/sink) | 10 mA (source/sink) | Drive capability must cover the reference input current of downstream converters and any external loads. |
| Supply Voltage Range | 4.5 V to 18 V | 7.0 V to 18 V | The minimum supply headroom differs; a 5 V output part needs higher supply, so the board's rail must satisfy the new device's minimum. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical package and pinout allow drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Matching temperature ranges ensures both parts meet the same environmental qualification for the application. |
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 | ADR420BRZ | ADR425AR |
|---|---|---|
| Series | XFET® | XFET® |
| Part Status | Active | Obsolete |
| Mounting Type | Surface Mount | Surface Mount |
| Reference Type | Series | - |
| Output Type | Fixed | - |
| Voltage - Output (Min/Fixed) | 2.048V | - |
| Current - Output | 10 mA | - |
| Tolerance | ±0.05% | - |
| Temperature Coefficient | 3ppm/°C | - |
| Noise - 01 Hzto10 Hz | 1.75µVp-p | - |
| Voltage - Input | 4V ~ 18V | - |
| Supply Current | 600µA | - |
| Operating Temperature | -40°C ~ 125°C (TA) | - |
Frequently asked questions
What are the key differences between the ADR420BRZ and ADR425AR voltage references?
The ADR420BRZ is a 2.048 V precision voltage reference in an 8-lead SOIC package with an initial accuracy of ±0.1% (B grade) and a temperature coefficient of 3 ppm/°C max. The ADR425AR is a 5.000 V precision voltage reference in an 8-lead SOIC package with an initial accuracy of ±0.1% (A grade) and a temperature coefficient of 3 ppm/°C max. The primary difference is the output voltage (2.048 V vs 5.000 V); both share the same series-mode architecture, package footprint, and grade-level accuracy specifications.
Are the ADR420BRZ and ADR425AR pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions: pin 1 and 8 are VIN, pin 2 is VOUT, pin 3 is GND, pin 4 is TRIM, pin 5 is SENSE, and pin 6 is VOUT (force). Because the pinout and package footprint are the same, they are pin-compatible, but the output voltage difference (2.048 V vs 5.000 V) must be accounted for in the target design.
Can the ADR420BRZ be used as a direct drop-in replacement for the ADR425AR?
No, not as a direct drop-in replacement. Although the packages and pinouts are identical, the ADR420BRZ provides a 2.048 V output while the ADR425AR provides a 5.000 V output. A substitution requires verifying that the system's ADC reference input, supply headroom, and downstream circuitry are compatible with the different output voltage. The substitution should only be made after validation against the manufacturer datasheets.
What is the initial accuracy of the ADR420BRZ and ADR425AR?
The ADR420BRZ (B grade) has an initial accuracy of ±0.1% max. The ADR425AR (A grade) also has an initial accuracy of ±0.1% max. Both grades are specified at 25°C per the Analog Devices datasheets.
What temperature coefficient do the ADR420BRZ and ADR425AR specify?
Both the ADR420BRZ and ADR425AR are specified with a maximum temperature coefficient of 3 ppm/°C over the −40°C to +125°C temperature range, according to the Analog Devices datasheets.
What are the supply voltage requirements for the ADR420BRZ and ADR425AR?
The ADR420BRZ operates from a supply voltage of 2.7 V to 18 V (minimum supply headroom above the 2.048 V output). The ADR425AR operates from a supply voltage of 5.5 V to 18 V (minimum supply headroom above the 5.000 V output). The higher output voltage of the ADR425AR requires a correspondingly higher minimum supply voltage.
What is the output current capability of the ADR420BRZ and ADR425AR?
Both the ADR420BRZ and ADR425AR can source and sink up to 10 mA of output current, per the Analog Devices datasheets. This makes both devices suitable for driving ADC reference inputs and other moderate loads.
Do the ADR420BRZ and ADR425AR share the same operating temperature range?
Yes. Both the ADR420BRZ and ADR425AR are specified for operation over the −40°C to +125°C industrial temperature range, per the Analog Devices datasheets.