Part A
ADR431ARMZ
ADI公司
- Lifecycle
- Active
- Stock
- 2255 件
- Series
- 電源管理（PMIC）-電壓參攷
Replacement verdict
Compatible functional replacement candidate
The ADR435ARMZ and ADR431ARMZ are both precision low-noise voltage references from the same ADR43x family, sharing an identical SOIC-8 package, series-mode topology, and wide operating temperature range, making them strong functional replacement candidates. The primary distinction is the output voltage (5.0 V versus 2.5 V), so the ADR431ARMZ can serve as a drop-in substitute for the ADR435ARMZ only where the downstream circuit is designed for a 2.5 V reference; designers must confirm the target system's reference voltage requirement before substitution.
Output Voltage
Not compatible
Package Type
High match
Reference Topology
High match
Operating Temperature Range
High match
Parts at a glance
Part B
ADR435ARMZ
ADI公司
- Lifecycle
- Active
- Stock
- 2455 件
- Package
- MSOP-8
- Series
- PMIC-電壓參攷
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR435ARMZ | ADR431ARMZ | Why it matters |
|---|---|---|---|
| Output Voltage | 5.0 V | 2.5 V | The nominal reference voltage determines the full-scale input range of the ADC or DAC the reference drives; a 5.0 V and 2.5 V reference are not directly interchangeable without rescaling the signal chain. |
| Initial Accuracy | ±2 mV (0.04%) | ±1 mV (0.04%) | Initial accuracy sets the absolute error of the reference at room temperature; tighter accuracy reduces or eliminates system calibration requirements. |
| Temperature Coefficient | 3 ppm/°C (B grade) | 3 ppm/°C (B grade) | Drift over temperature directly adds to system error; both parts share the same grade-dependent drift, so thermal performance is comparable. |
| Output Current Capability | 30 mA (source), 20 mA (sink) | 30 mA (source), 20 mA (sink) | Drive capability determines whether the reference can supply the load directly or needs a buffer; identical ratings mean equivalent load-driving behavior. |
| Supply Voltage Range | 7.0 V to 18 V | 4.5 V to 18 V | The minimum supply headroom differs because the 5.0 V output requires more headroom than the 2.5 V output; this affects compatibility with low-voltage rails. |
| Quiescent Current | 800 µA (typ) | 800 µA (typ) | Quiescent current impacts power budget in portable and low-power designs; identical values mean equivalent static power consumption. |
| Output Noise (0.1 Hz to 10 Hz) | 8 µV p-p (typ) | 3.4 µV p-p (typ) | Low-frequency noise limits resolution in precision DC measurements; the lower-voltage part exhibits lower absolute noise, which matters for high-resolution converters. |
| Long-Term Drift | 25 ppm/1000 hr (typ) | 25 ppm/1000 hr (typ) | Long-term stability determines recalibration intervals in precision systems; matching drift figures indicate comparable aging behavior. |
| Package | 8-Lead MSOP (RM) | 8-Lead MSOP (RM) | Package and pinout compatibility allows drop-in replacement on an existing PCB footprint without layout changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR431ARMZ | ADR435ARMZ |
|---|---|---|
| Series | XFET® | XFET® |
| Part Status | Active | Active |
| Base Product Number | ADR431 | - |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min / Fixed) | 2.5V | - |
| Current - Output | 30 mA | 30 mA |
| Tolerance | ±0.12% | ±0.12% |
| Temperature Coefficient | 10ppm/°C | 10ppm/°C |
| Noise - 0.1 Hz to 10 Hz | 3.5µVp-p | - |
| Voltage - Input | 4.5V ~ 18V | 7V ~ 18V |
| Supply Current | 800µA | 800µA |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Packaging | Tube | - |
| Voltage - Output (Min/Fixed) | - | 5V |
| Noise - 01 Hzto10 Hz | - | 8µVp-p |
Frequently asked questions
What are the key differences between the ADR435ARMZ and ADR431ARMZ voltage references?
The ADR435ARMZ provides a 5.000 V output, while the ADR431ARMZ provides a 2.500 V output. Both are precision low-noise XFET voltage references in an 8-lead MSOP (RM) package, but they differ in output voltage, initial accuracy grade, and temperature coefficient specifications per the Analog Devices datasheets.
Are the ADR435ARMZ and ADR431ARMZ pin-compatible?
Yes. Both devices are offered in the same 8-lead MSOP (RM suffix) package and share the same pinout, so they are footprint-compatible. However, the different output voltages mean the surrounding circuit must be designed for the respective reference value.
What initial accuracy do the ADR435ARMZ and ADR431ARMZ offer?
Per Analog Devices datasheets, the ADR435ARMZ (A grade) specifies an initial output accuracy of ±0.12% maximum, and the ADR431ARMZ (A grade) specifies ±0.12% maximum initial accuracy. Both are A-grade parts, so initial accuracy tolerance is the same percentage, though the absolute output voltages differ (5.000 V vs 2.500 V).
What temperature coefficient do these voltage references specify?
Both the ADR435ARMZ and ADR431ARMZ in the A grade are specified with a temperature coefficient of 10 ppm/°C maximum over the −40°C to +125°C operating range, according to the Analog Devices datasheets.
What is the output noise performance of the ADR435ARMZ and ADR431ARMZ?
Both devices are low-noise XFET references. The ADR435ARMZ specifies approximately 8 µV p-p typical (0.1 Hz to 10 Hz) output noise, and the ADR431ARMZ specifies approximately 3.4 µV p-p typical (0.1 Hz to 10 Hz), per the Analog Devices datasheets. The lower output voltage of the ADR431ARMZ corresponds to lower absolute noise.
What supply voltage and current do the ADR435ARMZ and ADR431ARMZ require?
Both devices operate from a supply of 4.5 V to 18 V for the ADR435ARMZ (5.000 V output) and 4.5 V to 18 V for the ADR431ARMZ (2.500 V output), with typical quiescent supply current of about 800 µA per the Analog Devices datasheets. The ADR435ARMZ requires headroom above its 5 V output, so the minimum 4.5 V supply applies to the lower-voltage ADR431ARMZ; verify the specific datasheet supply range for each part.
Can the ADR431ARMZ be used as a drop-in replacement for the ADR435ARMZ?
No, not as a direct functional replacement. Although both are pin-compatible 8-lead MSOP devices, the ADR431ARMZ outputs 2.500 V versus 5.000 V for the ADR435ARMZ. A replacement requires re-validating the system's reference voltage, ADC/DAC full-scale range, and any resistor divider ratios against the Analog Devices datasheets.
What are the operating temperature ranges for the ADR435ARMZ and ADR431ARMZ?
Both the ADR435ARMZ and ADR431ARMZ are specified for the extended industrial temperature range of −40°C to +125°C, per the Analog Devices datasheets.