Part A
ADR431ARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5145 PCS
- Package
- SOIC-8
- Series
- PMIC - référence de tension
Replacement verdict
Compatible functional replacement candidate
The ADR430ARZ and ADR431ARZ are functionally compatible voltage reference ICs from the same ADR43x family, sharing an identical SOIC-8 package, series voltage reference topology, and pin configuration. The ADR431ARZ offers a higher output voltage (2.500 V versus 2.048 V) with comparable initial accuracy and temperature drift, making it a viable replacement candidate where the higher reference voltage is acceptable. Designers should validate the output voltage change against their system requirements before substitution.
Output Voltage
Validation required
Package Type
High match
Reference Topology
High match
Pin Configuration
High match
Parts at a glance
Part B
ADR430ARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7048 PCS
- Package
- SOIC-8
- Series
- PMIC - référence de tension
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 | ADR431ARZ | Why it matters |
|---|---|---|---|
| Output Voltage | 2.048 V | 2.500 V | The reference voltage directly sets the full-scale value of the ADC/DAC; a different output voltage changes the system's measurement range and scaling. |
| Initial Accuracy | ±0.05% (max) | ±0.05% (max) | Initial accuracy determines the absolute error of the reference at room temperature and directly affects system calibration requirements. |
| Temperature Coefficient | 1 ppm/°C (max, A grade) | 1 ppm/°C (max, A grade) | Low tempco keeps the reference stable over temperature, which is critical for precision measurement accuracy across the operating range. |
| Output Current Capability | ±10 mA (source/sink) | ±10 mA (source/sink) | Drive capability determines whether the reference can directly supply the load or requires an external buffer. |
| Supply Voltage Range | 4.5 V to 18 V | 4.5 V to 18 V | The supply range must be compatible with the system rail; identical ranges mean the same power supply can be reused. |
| Supply Current | 800 µA (typ) | 800 µA (typ) | Quiescent current affects total power budget, especially in low-power or battery-operated designs. |
| Output Noise (0.1 Hz to 10 Hz) | 3.4 µV p-p (typ) | 3.4 µV p-p (typ) | Low-frequency noise limits the achievable resolution of high-precision converters and low-level signal measurements. |
| 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 | The temperature range must cover the application environment for guaranteed performance and reliability. |
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 | ADR431ARZ | 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 | ±0.12% | ±0.15% |
| Temperature Coefficient | 10ppm/°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 key differences between the ADR430ARZ and ADR431ARZ voltage references?
Both devices are series voltage references in the ADR43x family from Analog Devices, offered in an 8-lead SOIC package (R suffix). The primary difference is the output voltage: the ADR430ARZ provides a 2.048 V output, while the ADR431ARZ provides a 2.500 V output. Both share the same initial accuracy grade (A grade, ±0.05% typical) and low temperature coefficient characteristics per the Analog Devices datasheet.
Are the ADR430ARZ and ADR431ARZ pin-compatible?
Yes. Both parts are supplied in the same 8-lead SOIC (R-8) package with identical pin functions, including VIN, VOUT, GND, TRIM, and noise-reduction/filter pins. This allows a common PCB footprint, but the different output voltages must be accounted for in the circuit design.
Can the ADR430ARZ be used as a drop-in replacement for the ADR431ARZ?
Not directly. Although the packages and pinouts are identical, the output voltages differ (2.048 V versus 2.500 V). A substitution requires verifying that the system's ADC reference range, gain settings, and threshold levels are compatible with the new output voltage before replacing one with the other.
What is the initial accuracy of the ADR430ARZ and ADR431ARZ?
Both the ADR430ARZ and ADR431ARZ are A-grade devices with an initial output voltage accuracy of ±0.05% typical at 25°C, as specified in the Analog Devices ADR43x datasheet. The tighter grades (B grade) offer improved accuracy but are separate orderable part numbers.
What output current can the ADR430ARZ and ADR431ARZ source and sink?
Per the Analog Devices ADR43x datasheet, both devices can source up to 10 mA and sink up to 5 mA while maintaining specified regulation. This makes them suitable for driving ADC references and low-power analog circuitry.
Do the ADR430ARZ and ADR431ARZ require an external output capacitor?
Both devices are stable without an output capacitor, but the datasheet recommends a small output capacitor (typically 0.1 µF) for decoupling and noise reduction. A noise-reduction capacitor can also be connected to the designated NR pin to lower output noise.
What is the operating temperature range for the ADR430ARZ and ADR431ARZ?
Both devices are specified over the industrial temperature range of −40°C to +125°C, as stated in the Analog Devices ADR43x datasheet. Their low temperature coefficient ensures stable reference voltage across this range.