Part A
ADR431BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2196 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Compatible functional replacement candidate
The ADR430ARZ and ADR431BRZ are both series voltage references from the same ADR43x family, sharing an identical SOIC-8 package, pinout, and 2.5 V nominal output architecture, making the ADR431BRZ a viable functional replacement candidate for the ADR430ARZ. The primary distinction lies in the tighter initial accuracy and lower temperature coefficient grade of the ADR431BRZ, which generally meets or exceeds the ADR430ARZ specifications. Designers should confirm that the tighter output tolerance and slightly different operating current profile align with their application requirements before substituting.
Output Voltage
High match
Package Type
High match
Initial Accuracy
High match
Temperature Coefficient
Validation required
Parts at a glance
Part B
ADR430ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7048 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 | ADR430ARZ | ADR431BRZ | Why it matters |
|---|---|---|---|
| Output Voltage | 2.048 V | 2.500 V | The reference voltage sets the full-scale value of the ADC/DAC; a different output voltage changes the system's measurement range and scaling. |
| Initial Accuracy | ±0.10% (max) | ±0.04% (max) | Initial accuracy determines the untrimmed error at room temperature; the B-grade part offers tighter tolerance, affecting overall system precision. |
| Temperature Coefficient | 1 ppm/°C (max, A grade) | 3 ppm/°C (max, B grade) | Tempco governs reference drift over temperature; a lower value keeps accuracy stable across the operating range. |
| Output Current Capability | ±10 mA (source/sink) | ±10 mA (source/sink) | Determines how much load the reference can drive while maintaining regulation; identical capability means similar loading flexibility. |
| Supply Voltage Range | 4.5 V to 18 V | 4.5 V to 18 V | Defines the allowable input supply window; matching ranges mean the same power rail can be used for either part. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Confirms both parts are rated for the same environmental conditions, supporting drop-in use in industrial applications. |
| Package | 8-Lead SOIC (R) | 8-Lead SOIC (R) | Identical package and pinout allow physical interchangeability on the same PCB footprint. |
| Long-Term Drift | 25 ppm/1000 h (typ) | 25 ppm/1000 h (typ) | Long-term stability affects calibration intervals; matching drift behavior supports comparable lifetime accuracy. |
| Output Noise (0.1 Hz to 10 Hz) | 3.4 µV p-p (typ) | 3.4 µV p-p (typ) | Low-frequency noise limits achievable resolution in precision systems; similar noise performance preserves signal integrity. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR431BRZ | ADR430ARZ |
|---|---|---|
| Series | XFET® | XFET® |
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 2.5V | 2.048V |
| Current - Output | 30 mA | 30 mA |
| Tolerance | ±0.04% | ±0.15% |
| Temperature Coefficient | 3ppm/°C | 10ppm/°C |
| Noise - 01 Hzto10 Hz | 3.5µVp-p | 3.5µVp-p |
| Voltage - Input | 4.5V ~ 18V | 4.1V ~ 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 are the primary differences between the ADR430ARZ and ADR431BRZ voltage references?
The ADR430ARZ is a 2.048 V precision voltage reference with an initial accuracy of ±0.05% and a temperature coefficient of 1 ppm/°C (max) in an 8-lead SOIC package. The ADR431BRZ is a 2.500 V precision voltage reference with an initial accuracy of ±0.04% and a temperature coefficient of 3 ppm/°C (max) in an 8-lead SOIC package. The key differences are output voltage (2.048 V vs 2.500 V), initial accuracy grade, and temperature coefficient specification.
Are the ADR430ARZ and ADR431BRZ pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package and share the same pinout, including VIN, VOUT, GND, TRIM, and noise-reduction/filter pins. This allows board-level interchangeability when the output voltage difference is acceptable for the application.
Can the ADR430ARZ be used as a direct drop-in replacement for the ADR431BRZ?
Not directly. Although the packages and pinouts are identical, the output voltages differ (2.048 V vs 2.500 V), so a circuit designed for the ADR431BRZ's 2.500 V reference would see a different reference level with the ADR430ARZ. The replacement is only valid if the system is redesigned or recalibrated for the 2.048 V output and the accuracy/temperature coefficient grades are acceptable.
How do the initial accuracy and temperature coefficient specifications compare?
The ADR430ARZ specifies ±0.05% initial accuracy and 1 ppm/°C (max) temperature coefficient. The ADR431BRZ specifies ±0.04% initial accuracy and 3 ppm/°C (max) temperature coefficient. The ADR430ARZ offers a tighter temperature coefficient, while the ADR431BRZ offers slightly better initial accuracy in the B grade.
What are the output voltage options and how do they affect system design?
The ADR430ARZ provides a 2.048 V output, which is convenient for 12-bit and 16-bit ADC systems where 2.048 V equals 2^11 mV and simplifies binary scaling. The ADR431BRZ provides a 2.500 V output, which is a common reference for systems requiring a 2.5 V rail or compatibility with 2.5 V-based signal chains. The choice depends on the ADC/DAC full-scale requirement and the desired LSB size.
Do both devices share the same operating temperature range and supply requirements?
Yes. Both the ADR430ARZ and ADR431BRZ are specified over the extended industrial temperature range of −40°C to +125°C and operate from a supply voltage of 4.5 V to 18 V. Both also provide a low dropout voltage and low supply current, making them suitable for precision industrial and instrumentation applications.
Which device is better suited for high-accuracy, low-drift applications?
The ADR430ARZ is generally preferable for low-drift applications because its maximum temperature coefficient is 1 ppm/°C, compared with 3 ppm/°C for the ADR431BRZ. However, the ADR431BRZ provides a 2.500 V output with ±0.04% initial accuracy, so the selection should be based on the required output voltage and the relative weighting of initial accuracy versus drift.