Part A
ADR420BRZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6197 個数
- Package
- SOIC-8
- Series
- PMIC - 電圧リファレンス
Replacement verdict
Compatible functional replacement candidate
The ADR425BRZ and ADR420BRZ are both precision voltage references from the same ADR42x family, sharing a common SOIC-8 footprint and identical pinout, which makes them strong functional replacement candidates. However, they differ in output voltage (5.000 V vs 2.048 V) and initial accuracy/temperature coefficient grades, so the replacement is only valid where the system can accommodate the different reference voltage and the tighter or looser accuracy budget. Designers should confirm the output voltage requirement and accuracy tolerance before substituting.
Output Voltage
Not compatible
Package Type
High match
Pin Configuration
High match
Initial Accuracy and 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 | ADR425BRZ | ADR420BRZ | 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 changes the system's measurement range and cannot be substituted without recalibration. |
| Initial Accuracy | ±0.04% (B grade) | ±0.05% (B grade) | Initial accuracy determines the absolute error at room temperature; tighter tolerance reduces end-system calibration effort and measurement uncertainty. |
| Temperature Coefficient | 3 ppm/°C (B grade) | 3 ppm/°C (B grade) | Tempco governs drift over temperature; matching values means both parts behave similarly across the operating range, though the absolute output still differs. |
| Output Current Capability | 10 mA source/sink | 10 mA source/sink | Drive capability determines whether the reference can supply the load directly; identical ratings mean similar loading behavior in the target circuit. |
| Supply Voltage Range | 4.5 V to 18 V | 4.5 V to 18 V | The supply range must accommodate the system rail; identical ranges mean the same power supply can be used for either part. |
| Supply Current | 0.8 mA typ | 0.8 mA typ | Quiescent current affects total power budget; matching values mean no change in power consumption when swapping parts. |
| Output Noise (0.1 Hz to 10 Hz) | 3.4 µV p-p typ | 1.75 µV p-p typ | Low-frequency noise limits resolution in precision systems; the lower noise of the ADR420BRZ may be required for high-resolution converters. |
| Long-Term Drift | 50 ppm/1000 hr typ | 50 ppm/1000 hr typ | Long-term stability affects recalibration intervals; identical drift means comparable lifetime accuracy performance. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package and pinout must match for board-level drop-in compatibility; identical packages allow the same footprint. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR420BRZ | ADR425BRZ |
|---|---|---|
| Series | XFET® | XFET® |
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 2.048V | 5V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.05% | ±0.04% |
| Temperature Coefficient | 3ppm/°C | 3ppm/°C |
| Noise - 01 Hzto10 Hz | 1.75µVp-p | 3.4µVp-p |
| Voltage - Input | 4V ~ 18V | 7V ~ 18V |
| Supply Current | 600µA | 600µA |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADR425BRZ and ADR420BRZ voltage references?
The ADR425BRZ provides a fixed 5.000 V output, while the ADR420BRZ provides a fixed 2.048 V output. Both are precision low-noise voltage references in an 8-lead SOIC package (RZ suffix) and belong to the same ADR42x family, but they differ in output voltage, initial accuracy, and temperature coefficient specifications.
What initial accuracy and temperature coefficient do the ADR425BRZ and ADR420BRZ offer?
The ADR425BRZ (B grade) offers ±0.04% initial accuracy and a temperature coefficient of 3 ppm/°C max. The ADR420BRZ (B grade) offers ±0.05% initial accuracy and a temperature coefficient of 3 ppm/°C max. Both B-grade parts are among the higher-precision grades in the ADR42x family.
Are the ADR425BRZ and ADR420BRZ pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (RZ) package with the same pinout, so they are pin-compatible. However, because their output voltages differ (5.000 V vs 2.048 V), they are not electrically interchangeable in a given circuit without verifying that the downstream system tolerates the different reference voltage.
What is the operating temperature range for these voltage references?
Both the ADR425BRZ and ADR420BRZ are specified over the extended industrial temperature range of −40°C to +125°C, making them suitable for industrial and instrumentation applications.
What output current can the ADR425BRZ and ADR420BRZ source or sink?
Both devices can source and sink output current, with the datasheet specifying operation over a defined output current range (typically up to ±10 mA). Designers should consult the manufacturer datasheet for the exact guaranteed load-current limits and the resulting output voltage error at the chosen load.
How do the noise specifications compare between the ADR425BRZ and ADR420BRZ?
Both parts are low-noise references in the ADR42x family. The ADR425BRZ specifies low output voltage noise (on the order of a few µV p-p over 0.1 Hz to 10 Hz), and the ADR420BRZ specifies similarly low noise for its 2.048 V output. For exact noise figures, refer to the respective manufacturer datasheets, as values are specified per output voltage.
Can the ADR420BRZ be used as a drop-in replacement for the ADR425BRZ?
No, not as a direct electrical replacement. Although they share the same package and pinout, the ADR420BRZ outputs 2.048 V versus 5.000 V for the ADR425BRZ. A drop-in substitution would change the reference voltage seen by the system, so the design must be revalidated for the new reference level before substitution.