Part A
ADR425BRZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4942 ПКС
- Package
- SOIC-8
- Series
- PMIC - Справочник напряжения
Replacement verdict
Compatible functional replacement candidate
The ADR425BRZ and ADR420AR are both precision voltage references from the same ADR42x family, sharing a common SOIC-8 footprint and series-mode topology, but they differ in output voltage, initial accuracy, and temperature coefficient. The ADR425BRZ offers a 5.000 V output with tighter B-grade accuracy, while the ADR420AR provides a 2.048 V output with A-grade tolerance. Because the output voltage differs, the ADR420AR is not a direct drop-in substitute for the ADR425BRZ in circuits designed around a 5 V reference; substitution requires validation of the reference voltage, accuracy budget, and thermal drift in the target application.
Output Voltage
Not compatible
Initial Accuracy
Validation required
Temperature Coefficient
Validation required
Package Type
High match
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR425BRZ | ADR420AR | Why it matters |
|---|---|---|---|
| Output Voltage | 5.0 V | 2.048 V | The reference voltage sets the full-scale value of the ADC/DAC; a different output voltage means the two parts are not directly interchangeable in a given circuit. |
| Initial Accuracy | ±0.04% (max) | ±0.15% (max) | Initial accuracy determines the untrimmed error of the reference and directly affects system measurement precision. |
| Temperature Coefficient | 3 ppm/°C (max) | 10 ppm/°C (max) | Drift over temperature dominates total error in precision systems; a lower tempco yields more stable performance across the operating range. |
| Output Current Capability | 10 mA (source/sink) | 10 mA (source/sink) | Drive capability determines how much load the reference can supply while maintaining regulation. |
| Supply Voltage Range | 7.0 V to 18 V | 4.5 V to 18 V | The minimum supply headroom must exceed the output voltage plus dropout; the 5 V output part requires a higher minimum supply. |
| Supply Current | 0.8 mA (typ) | 0.8 mA (typ) | Quiescent current affects power budget in low-power and battery-operated designs. |
| Output Noise (0.1 Hz to 10 Hz) | 3.4 µV p-p (typ) | 1.75 µV p-p (typ) | Low-frequency noise limits achievable resolution in high-resolution converters and precision instrumentation. |
| Long-Term Stability | 50 ppm/1000 hr (typ) | 50 ppm/1000 hr (typ) | Long-term drift determines recalibration intervals and lifetime accuracy in industrial and instrumentation applications. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility affects PCB footprint and assembly; identical packages simplify board-level substitution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR425BRZ | ADR420AR |
|---|---|---|
| Series | XFET® | XFET® |
| Part Status | Active | Obsolete |
| Mounting Type | Surface Mount | Surface Mount |
| Reference Type | Series | - |
| Output Type | Fixed | - |
| Voltage - Output (Min/Fixed) | 5V | - |
| Current - Output | 10 mA | - |
| Tolerance | ±0.04% | - |
| Temperature Coefficient | 3ppm/°C | - |
| Noise - 01 Hzto10 Hz | 3.4µVp-p | - |
| Voltage - Input | 7V ~ 18V | - |
| Supply Current | 600µA | - |
| Operating Temperature | -40°C ~ 125°C (TA) | - |
Frequently asked questions
What are the key differences between the ADR425BRZ and ADR420AR voltage references?
The ADR425BRZ is a 5.000 V precision voltage reference in an SOIC-8 package with a typical initial accuracy of ±0.04% and a maximum temperature coefficient of 3 ppm/°C (B grade). The ADR420AR is a 2.048 V precision voltage reference in an SOIC-8 package with a typical initial accuracy of ±0.1% and a maximum temperature coefficient of 10 ppm/°C (A grade). The primary differences are output voltage (5.000 V vs 2.048 V) and precision grade.
Can the ADR425BRZ and ADR420AR be used interchangeably in the same circuit?
No. The ADR425BRZ provides a 5.000 V output while the ADR420AR provides a 2.048 V output, so they are not directly interchangeable without redesigning the circuit for the different reference voltage. Package and pinout are compatible (both SOIC-8), but the output voltage difference precludes direct substitution.
What are the output voltage and initial accuracy specifications of each device?
The ADR425BRZ has a 5.000 V output with an initial accuracy of ±0.04% typical (±2 mV) per the B grade specification. The ADR420AR has a 2.048 V output with an initial accuracy of ±0.1% typical (±2 mV) per the A grade specification. Both values should be confirmed against the respective manufacturer datasheets.
How do the temperature coefficients of the ADR425BRZ and ADR420AR compare?
The ADR425BRZ (B grade) specifies a maximum temperature coefficient of 3 ppm/°C. The ADR420AR (A grade) specifies a maximum temperature coefficient of 10 ppm/°C. The ADR425BRZ therefore offers tighter drift performance over temperature.
Do the ADR425BRZ and ADR420AR share the same package and pinout?
Yes. Both devices are offered in an 8-lead SOIC package (SOIC-8) with the same pin configuration, including VIN, VOUT, GND, TRIM, and noise-reduction/sense pins as defined in the Analog Devices datasheets. This allows PCB layout compatibility, though the output voltage difference still prevents direct electrical substitution.
What are the operating temperature ranges for the ADR425BRZ and ADR420AR?
Both the ADR425BRZ and ADR420AR are specified for the extended industrial temperature range of −40°C to +125°C, as stated in the Analog Devices datasheets. Designers should verify the exact grade-specific limits in the respective datasheet before use.
Which device is better suited for a low-voltage, high-precision ADC reference application?
The ADR420AR provides a 2.048 V reference, which suits low-voltage ADCs with a 2.048 V or 2.5 V full-scale input, while the ADR425BRZ provides 5.000 V for higher full-scale ranges. For precision, the ADR425BRZ offers tighter initial accuracy and lower temperature coefficient, but the choice depends on the ADC's required reference voltage and system supply headroom.