Part A
ADR430ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7048 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Compatible functional replacement candidate
The ADR434BRZ and ADR430ARZ are both series voltage references from the same ADR43x family, sharing a common SOIC-8 footprint and series-mode topology, but they differ in output voltage, initial accuracy, and temperature coefficient grade. The ADR434BRZ offers a 4.096 V output with tighter B-grade accuracy, while the ADR430ARZ provides a 2.048 V output at A-grade tolerance. Because the output voltage differs, the ADR430ARZ is not a direct drop-in substitute for the ADR434BRZ in circuits designed around a 4.096 V reference; substitution requires validation of the reference voltage, accuracy budget, and thermal drift requirements against the target design.
Output Voltage
Not compatible
Initial Accuracy
Validation required
Temperature Coefficient
Validation required
Package Type
High match
Parts at a glance
Part B
ADR434BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2099 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 | ADR434BRZ | ADR430ARZ | Why it matters |
|---|---|---|---|
| Initial Accuracy | ±0.05% (max) | ±0.15% (max) | Tighter initial accuracy reduces or eliminates the need for system calibration and directly affects output voltage precision. |
| Output Voltage | 4.096 V | 2.048 V | The reference voltage sets the full-scale input range of an ADC or DAC; a different value changes the system's measurement span and cannot be substituted without redesign. |
| Temperature Coefficient | 3 ppm/°C (max) | 10 ppm/°C (max) | Lower drift over temperature yields more stable readings across the operating range, critical for precision instrumentation. |
| Output Current Capability | 30 mA (source/sink) | 30 mA (source/sink) | Determines how much load the reference can drive; both share the same drive strength, so load-driving capability is equivalent. |
| Supply Voltage Range | 4.1 V to 18 V | 4.1 V to 18 V | Defines the allowable input supply window; identical ranges mean the same power supply 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, ensuring reliability in industrial applications. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Matching package and pinout allows drop-in board replacement without layout changes. |
| Output Noise (0.1 Hz to 10 Hz) | 3.4 µV p-p (typ) | 1.7 µV p-p (typ) | Low-frequency noise limits achievable resolution in high-precision ADCs; the difference affects noise floor performance. |
| Long-Term Drift | 25 ppm/1000 hr (typ) | 25 ppm/1000 hr (typ) | Indicates stability over the product lifetime; equal drift means comparable long-term calibration stability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR430ARZ | ADR434BRZ |
|---|---|---|
| Series | XFET® | XFET® |
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 2.048V | 4.096V |
| Current - Output | 30 mA | 30 mA |
| Tolerance | ±0.15% | ±0.04% |
| Temperature Coefficient | 10ppm/°C | 3ppm/°C |
| Noise - 01 Hzto10 Hz | 3.5µVp-p | 6.25µVp-p |
| Voltage - Input | 4.1V ~ 18V | 6.1V ~ 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 ADR434BRZ and ADR430ARZ voltage references?
The ADR434BRZ is a 4.096 V precision voltage reference with an initial accuracy of ±0.05% (B grade) and a maximum temperature coefficient of 3 ppm/°C, while the ADR430ARZ is a 2.048 V reference with an initial accuracy of ±0.1% (A grade) and a maximum temperature coefficient of 5 ppm/°C. Both are series-mode references in SOIC-8 packages from Analog Devices, but they differ in output voltage, accuracy grade, and tempco specification.
Are the ADR434BRZ and ADR430ARZ pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC package with identical pin functions (VIN, VOUT, GND, TRIM, and noise-reduction/filter pins). However, because the output voltages differ (4.096 V vs 2.048 V), they are not electrically interchangeable in a given design without verifying that the downstream circuitry accepts the different reference voltage.
What is the output voltage of each device?
The ADR434BRZ provides a fixed 4.096 V output, and the ADR430ARZ provides a fixed 2.048 V output. Both are members of the ADR43x family of low-noise, high-accuracy series voltage references.
How do the initial accuracy and temperature coefficient grades compare?
The ADR434BRZ (B grade) specifies ±0.05% initial accuracy and 3 ppm/°C maximum temperature coefficient. The ADR430ARZ (A grade) specifies ±0.1% initial accuracy and 5 ppm/°C maximum temperature coefficient. The B-grade ADR434BRZ therefore offers tighter initial accuracy and lower drift than the A-grade ADR430ARZ.
What are the operating temperature ranges and supply requirements for these references?
Both the ADR434BRZ and ADR430ARZ are specified over the extended industrial temperature range of −40°C to +125°C. Both require a supply voltage headroom above the output (typically VIN of at least VOUT + 2 V for specified operation) and draw a low quiescent current suitable for precision data-acquisition systems.
Can the ADR430ARZ be used as a drop-in replacement for the ADR434BRZ?
No, not as a direct electrical replacement. Although the package and pinout are the same, the ADR430ARZ outputs 2.048 V instead of 4.096 V, which would halve the reference voltage seen by the ADC or DAC. A replacement requires revalidation of the system's full-scale range, gain calibration, and any resistor-divider ratios tied to the reference value.
Which device is better suited for a 4.096 V full-scale ADC reference?
The ADR434BRZ is the appropriate choice when a 4.096 V full-scale reference is required, as it directly provides that output with ±0.05% initial accuracy and 3 ppm/°C drift. The ADR430ARZ's 2.048 V output would require external gain or a different ADC configuration to achieve a 4.096 V full-scale range.