Part A
ADR431ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5145 Stückzahl
- Package
- SOIC-8
- Series
- PMIC Spannung Referenz
Replacement verdict
Compatible functional replacement candidate
The ADR431ARZ and ADR434AR-REEL7 are both precision voltage references from the same ADR43x family, sharing a common SOIC-8 footprint and series-mode topology, but they differ in output voltage and initial accuracy grade. The ADR431ARZ provides a 2.500 V output while the ADR434AR-REEL7 provides a 4.096 V output, so the two are not electrically interchangeable in a given circuit without verifying the required reference voltage. Designers should confirm output voltage, accuracy grade, and thermal drift against the target application before substituting one for the other.
Output Voltage
Not compatible
Initial Accuracy Grade
Validation required
Package Type
High match
Temperature Coefficient
Validation required
Parts at a glance
Part B
ADR434AR-REEL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 178 Stückzahl
- Package
- SOIC-8
- Series
- PMIC Spannung Referenz
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR431ARZ | ADR434AR-REEL7 | Why it matters |
|---|---|---|---|
| Output Voltage | 2.5 V | 4.096 V | The reference voltage is the fundamental output; a different value means the parts are not directly interchangeable in a given circuit. |
| Initial Accuracy | ±0.1% (max) | ±0.1% (max) | Initial accuracy determines the untrimmed error of the reference at room temperature and affects overall system precision. |
| Temperature Coefficient | 10 ppm/°C (max) | 10 ppm/°C (max) | Drift over temperature directly impacts accuracy in precision measurement and data-acquisition systems. |
| Output Current Capability | 30 mA (source/sink) | 30 mA (source/sink) | Determines how much load current the reference can supply while maintaining regulation. |
| Supply Voltage Range | 4.5 V to 18 V | 4.5 V to 18 V | Defines the allowable input supply window and headroom required above the reference output. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility affects PCB footprint and thermal/assembly considerations. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Ensures the part meets specifications across the intended application environment. |
| Output Noise (0.1 Hz to 10 Hz) | 3.4 µV p-p (typ) | 5.6 µV p-p (typ) | Low-frequency noise limits resolution in high-precision converters and instrumentation. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR431ARZ | ADR434AR-REEL7 |
|---|---|---|
| Series | XFET® | XFET® |
| Part Status | Active | Obsolete |
| Mounting Type | Surface Mount | Surface Mount |
| Reference Type | Series | - |
| Output Type | Fixed | - |
| Voltage - Output (Min/Fixed) | 2.5V | - |
| Current - Output | 30 mA | - |
| Tolerance | ±0.12% | - |
| Temperature Coefficient | 10ppm/°C | - |
| Noise - 01 Hzto10 Hz | 3.5µVp-p | - |
| Voltage - Input | 4.5V ~ 18V | - |
| Supply Current | 800µA | - |
| Operating Temperature | -40°C ~ 125°C (TA) | - |
Frequently asked questions
What are the primary differences between the ADR431ARZ and ADR434AR-REEL7 voltage references?
The ADR431ARZ is a 2.500 V precision voltage reference in an 8-lead SOIC package, while the ADR434AR-REEL7 is a 4.096 V precision voltage reference in an 8-lead SOIC package supplied on tape and reel. Both are members of Analog Devices' ADR43x family of low-noise, high-accuracy XFET references, but they differ in output voltage and packaging format.
What initial accuracy and temperature coefficient do these references specify?
The ADR431ARZ (A grade) specifies an initial accuracy of ±0.12% and a temperature coefficient of 10 ppm/°C max. The ADR434AR-REEL7 (A grade) specifies an initial accuracy of ±0.12% and a temperature coefficient of 10 ppm/°C max. Both A-grade devices share the same accuracy and drift specifications, differing only in output voltage.
What output voltage does each device provide?
The ADR431ARZ provides a fixed 2.500 V output. The ADR434AR-REEL7 provides a fixed 4.096 V output. The 4.096 V value of the ADR434 is commonly chosen for 12-bit and 16-bit ADC reference applications because it yields a convenient 1 mV/LSB scaling.
Are the ADR431ARZ and ADR434AR-REEL7 pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with the same pinout: pin 1 and pin 8 are NC, pin 2 is VIN, pin 3 is NC, pin 4 is GND, pin 5 is TRIM, pin 6 is VOUT, and pin 7 is NC. This allows a common PCB footprint, but the different output voltages must be accounted for in the design.
What are the operating temperature range and supply voltage requirements?
Both the ADR431ARZ and ADR434AR-REEL7 are specified over the −40°C to +125°C extended industrial temperature range. Both require a minimum supply voltage of VOUT + 2 V (headroom), so the ADR431ARZ needs at least 4.5 V and the ADR434AR-REEL7 needs at least 6.096 V. The maximum specified supply voltage for both is 18 V.
How do the noise and long-term stability specifications compare?
Both devices in the ADR43x family specify low output noise of 3.4 µV p-p (0.1 Hz to 10 Hz) typical and long-term stability of 25 ppm typical per 1,000 hours. These low-noise characteristics make both parts suitable for precision data acquisition and instrumentation applications.
What is the difference in packaging between the two part numbers?
The ADR431ARZ is supplied in standard tube packaging in the 8-lead SOIC package. The ADR434AR-REEL7 suffix indicates tape-and-reel packaging (7-inch reel) for automated pick-and-place assembly. The electrical performance is identical to the equivalent tube-packaged ADR434AR part; only the shipping format differs.
Can the ADR431ARZ be used as a drop-in replacement for the ADR434AR-REEL7?
No. Although both share the same 8-lead SOIC footprint and pinout, they provide different output voltages (2.500 V vs 4.096 V). A substitution would change the reference voltage seen by the ADC or system, requiring recalibration or redesign of the signal chain. The correct replacement must match the required output voltage.