Part A
ADR4540BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7461 Stückzahl
- Package
- SOIC-8
- Series
- PMIC Spannung Referenz
Replacement verdict
Compatible functional replacement candidate
The ADR4540ARZ and ADR4540BRZ are functionally interchangeable voltage reference ICs sharing the same package, pinout, output voltage, and operating temperature range, with the B-grade offering tighter initial accuracy and lower temperature coefficient. The ADR4540BRZ can serve as a higher-precision drop-in replacement for the ADR4540ARZ in most designs, while substituting the A-grade for the B-grade may reduce precision margin in accuracy-critical applications.
Output Voltage
High match
Package Type
High match
Operating Temperature Range
High match
Initial Accuracy and Temperature Coefficient
Validation required
Parts at a glance
Part B
ADR4540ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3340 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 | ADR4540ARZ | ADR4540BRZ | Why it matters |
|---|---|---|---|
| Initial Accuracy (Vout) | ±0.04% (max) | ±0.02% (max) | Tighter initial tolerance reduces system calibration effort and improves absolute output accuracy at power-up. |
| Temperature Coefficient | 2 ppm/°C (max) | 1 ppm/°C (max) | Lower tempco keeps the reference stable across temperature, critical for precision measurement and industrial applications. |
| Output Voltage Noise (0.1 Hz to 10 Hz) | 2.7 µV p-p (typ) | 2.7 µV p-p (typ) | Low-frequency noise directly limits resolution in high-precision ADC/DAC systems. |
| Output Voltage | 4.096 V | 4.096 V | The nominal output must match the target system's reference requirement for direct substitutability. |
| Supply Voltage Range | 4.5 V to 15 V | 4.5 V to 15 V | Compatible supply range ensures the part can drop into the same rail without redesign. |
| Output Current Capability | ±10 mA | ±10 mA | Sufficient drive current supports both reference and light load driving in the same circuit. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Identical temperature ratings allow use in the same industrial and automotive environments. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same footprint and package enable direct PCB drop-in replacement. |
| Long-Term Drift | 25 ppm/1000 hr (typ) | 25 ppm/1000 hr (typ) | Long-term stability affects recalibration intervals and lifetime accuracy of the system. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR4540BRZ | ADR4540ARZ |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 4.096V | 4.096V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.02% | ±0.04% |
| Temperature Coefficient | 2ppm/°C | 4ppm/°C |
| Noise - 01 Hzto10 Hz | 2.7µVp-p | 2.7µVp-p |
| Voltage - Input | 4.2V ~ 15V | 4.2V ~ 15V |
| Supply Current | 950µA | 950µA |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the ADR4540ARZ and ADR4540BRZ?
The ADR4540ARZ and ADR4540BRZ are both 4.096 V high-precision voltage references in an 8-lead SOIC package, but they differ in initial accuracy and temperature coefficient grade. The A-grade (ADR4540ARZ) offers tighter guaranteed specifications than the B-grade (ADR4540BRZ), making the B-grade the higher-precision option of the two.
What initial output voltage accuracy does each grade guarantee?
The ADR4540ARZ (A-grade) guarantees an initial output voltage accuracy of ±0.04% maximum, while the ADR4540BRZ (B-grade) guarantees ±0.02% maximum. Both are specified at 4.096 V output.
How do the temperature coefficient specifications compare?
The ADR4540ARZ specifies a maximum temperature coefficient of 2 ppm/°C, whereas the ADR4540BRZ specifies a maximum temperature coefficient of 1 ppm/°C over the specified operating temperature range.
Are the ADR4540ARZ and ADR4540BRZ pin-compatible and package-compatible?
Yes. Both devices are offered in the same 8-lead SOIC package with identical pinout, so they are footprint- and pin-compatible. The difference between the two is limited to the precision grade, not the package or pin functions.
Can the ADR4540ARZ and ADR4540BRZ be used interchangeably in a design?
Because both parts share the same package, pinout, and 4.096 V nominal output, they can be interchanged in many designs. However, the B-grade provides tighter initial accuracy and lower temperature coefficient, so substitution should be validated against the accuracy budget and drift requirements of the target application.
What is the output voltage of both devices?
Both the ADR4540ARZ and ADR4540BRZ provide a nominal output voltage of 4.096 V. This value is commonly used with 12-bit and 16-bit ADCs because it scales conveniently to binary reference levels.
Do both grades share the same operating temperature range and supply requirements?
Yes. Both the ADR4540ARZ and ADR4540BRZ are specified over the same extended industrial temperature range and share the same supply voltage and quiescent current characteristics. The grade designation affects only the guaranteed accuracy and drift specifications.