Part A
ADR431ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5145 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Compatible functional replacement candidate
The ADR431BRZ and ADR431ARZ are functionally compatible voltage references sharing the same package, pinout, output voltage, and operating temperature range, with the BRZ grade offering tighter initial accuracy and lower temperature coefficient. The ARZ can serve as a drop-in substitute where the tighter precision of the BRZ grade is not required, while the BRZ remains the preferred choice for precision-critical designs.
Output Voltage
High match
Package Type
High match
Operating Temperature Range
High match
Initial Accuracy and Temperature Coefficient
Validation required
Parts at a glance
Part B
ADR431BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2196 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR431BRZ | ADR431ARZ | Why it matters |
|---|---|---|---|
| Initial Accuracy (Vout tolerance) | ±0.04% (max) | ±0.12% (max) | Tighter initial tolerance reduces or eliminates system calibration and directly affects output voltage precision at room temperature. |
| Temperature Coefficient | 3 ppm/°C (max) | 10 ppm/°C (max) | Lower tempco means the reference drifts less over temperature, which is critical for high-accuracy measurement and conversion over the operating range. |
| Output Voltage | 2.500 V | 2.500 V | Both provide the same nominal reference voltage, so the target system's full-scale range is unchanged when substituting one for the other. |
| Output Current Capability | 30 mA (source/sink) | 30 mA (source/sink) | Identical drive capability ensures the same load-driving margin for the reference in the application. |
| Supply Voltage Range | 4.5 V to 18 V | 4.5 V to 18 V | Matching input range confirms the same supply rail can be used without redesigning the power stage. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package and pinout allow a drop-in board-level replacement without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature range ensures both parts are qualified for the same environmental conditions. |
| Output Noise (0.1 Hz to 10 Hz) | 3.4 µV p-p (typ) | 3.4 µV p-p (typ) | Low-frequency noise is the same, so resolution and stability in precision signal chains are unaffected by the substitution. |
| Long-Term Drift | 25 ppm/1000 hr (typ) | 25 ppm/1000 hr (typ) | Matching long-term stability means recalibration intervals and lifetime accuracy expectations remain the same. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR431ARZ | ADR431BRZ |
|---|---|---|
| Series | XFET® | XFET® |
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 2.5V | 2.5V |
| Current - Output | 30 mA | 30 mA |
| Tolerance | ±0.12% | ±0.04% |
| Temperature Coefficient | 10ppm/°C | 3ppm/°C |
| Noise - 01 Hzto10 Hz | 3.5µVp-p | 3.5µVp-p |
| Voltage - Input | 4.5V ~ 18V | 4.5V ~ 18V |
| Supply Current | 800µA | 800µA |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the main difference between the ADR431BRZ and ADR431ARZ?
The primary difference is the initial accuracy grade. The ADR431BRZ offers a tighter initial voltage tolerance of ±0.05% (B grade), while the ADR431ARZ has an initial tolerance of ±0.12% (A grade). Both are 2.500 V XFET voltage references in an 8-lead SOIC package.
Are the ADR431BRZ and ADR431ARZ pin-compatible and package-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions, so they are drop-in compatible in terms of footprint and pinout. The difference is the specified accuracy and temperature coefficient grade, not the package.
How do the temperature coefficient specifications compare between the two grades?
The ADR431BRZ is specified with a temperature coefficient of 3 ppm/°C (max), while the ADR431ARZ is specified at 10 ppm/°C (max) over the operating temperature range. The B grade therefore provides tighter drift performance for precision applications.
Do both parts share the same output voltage and operating supply range?
Yes. Both the ADR431BRZ and ADR431ARZ provide a 2.500 V output and operate from a supply voltage of 4.5 V to 18 V. Their quiescent current and output current capability specifications are the same across grades.
Can the ADR431ARZ be used as a substitute for the ADR431BRZ?
Functionally yes, but only if the looser ±0.12% initial accuracy and 10 ppm/°C maximum temperature coefficient of the A grade meet the design requirements. For circuits requiring the tighter ±0.05% initial accuracy and 3 ppm/°C drift of the B grade, the ARZ is not an equivalent substitute.
What is the long-term stability specification for these references?
Both the ADR431BRZ and ADR431ARZ are specified with long-term stability of 25 ppm per 1,000 hours at 25°C, per the Analog Devices datasheet. This specification is common to both accuracy grades.
Which grade should be selected for a high-precision data acquisition design?
For high-precision data acquisition where initial error and drift directly affect measurement accuracy, the ADR431BRZ is the appropriate choice due to its ±0.05% initial tolerance and 3 ppm/°C maximum temperature coefficient. The ADR431ARZ is suitable for applications where the wider ±0.12% tolerance and 10 ppm/°C drift are acceptable.