Part A
ADR4540BRZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 7461 個数
- Package
- SOIC-8
- Series
- PMIC - 電圧リファレンス
Replacement verdict
Compatible functional replacement candidate
The ADR4525ARZ-R7 and ADR4540BRZ share the same series architecture, package footprint, and output topology, making them viable functional substitutes in many designs. However, the ADR4540BRZ offers a higher output voltage and tighter initial accuracy, so the replacement is only appropriate where the increased reference voltage and improved tolerance are acceptable to the surrounding circuit. Designers should validate supply headroom, load regulation, and thermal behavior before committing to the substitution.
Output Voltage
Not compatible
Initial Accuracy
Validation required
Package Type
High match
Operating Temperature Range
High match
Parts at a glance
Part B
ADR4525ARZ-R7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6327 個数
- Package
- SOIC-8
- Series
- PMIC - 電圧リファレンス
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR4525ARZ-R7 | ADR4540BRZ | Why it matters |
|---|---|---|---|
| Output Voltage | 2.5 V | 4.096 V | The reference voltage sets the full-scale input range of an ADC or DAC; a different value directly changes system scaling and cannot be substituted without recalibration. |
| Initial Accuracy | ±0.02% (A grade) | ±0.02% (B grade) | Initial accuracy determines the untrimmed error at room temperature; both grades offer tight tolerance, but the grade designation reflects guaranteed limits that must match the application budget. |
| Temperature Coefficient | 2 ppm/°C (A grade) | 2 ppm/°C (B grade) | Drift over temperature dominates precision error in wide-temperature systems; matching tempco ensures comparable accuracy across the operating range. |
| Output Current Capability | 10 mA (source/sink) | 10 mA (source/sink) | Drive capability determines whether the reference can supply the load directly or needs buffering; identical ratings mean similar loading behavior. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | The supply range must accommodate the system rail; identical ranges allow the same power supply design to be reused. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range defines environmental compatibility; matching ranges ensure the part is qualified for the same application conditions. |
| Package | 8-Lead SOIC (R-8) | 8-Lead SOIC (R-8) | Package compatibility affects PCB footprint and assembly; identical packages allow drop-in layout reuse. |
| Long-Term Drift | 25 ppm/1000 hrs | 25 ppm/1000 hrs | Long-term drift affects calibration stability over the product lifetime; matching drift specifications ensures comparable maintenance intervals. |
| Output Noise (0.1 Hz to 10 Hz) | 1.25 µV p-p | 1.25 µV p-p | Low-frequency noise limits resolution in precision measurement; identical noise performance preserves signal-to-noise ratio. |
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 | ADR4540BRZ | ADR4525ARZ-R7 |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 4.096V | 2.5V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.02% | ±0.04% |
| Temperature Coefficient | 2ppm/°C | 4ppm/°C |
| Noise - 01 Hzto10 Hz | 2.7µVp-p | 1.25µVp-p |
| Voltage - Input | 4.2V ~ 15V | 3V ~ 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 are the key differences between the ADR4525ARZ-R7 and ADR4540BRZ?
The ADR4525ARZ-R7 is a 2.5 V precision voltage reference with ±0.04% initial accuracy (A grade) and 2 ppm/°C maximum temperature coefficient, supplied in an 8-lead SOIC package and provided in 7-inch reel packaging. The ADR4540BRZ is a 4.096 V precision voltage reference with ±0.02% initial accuracy (B grade) and 2 ppm/°C maximum temperature coefficient, supplied in an 8-lead SOIC package in tube packaging. The primary differences are output voltage (2.5 V vs 4.096 V), initial accuracy grade (A vs B), and packaging format (reel vs tube).
Are the ADR4525ARZ-R7 and ADR4540BRZ pin-compatible?
Both devices are offered in the same 8-lead SOIC (R-8) package with the same pinout: pin 1 and pin 8 are not connected, pin 2 is VIN, pin 3 is not connected, pin 4 is GND, pin 5 is TRIM, pin 6 is VOUT, and pin 7 is not connected. Because the pinout and package are identical, they are pin-compatible, but the output voltage difference (2.5 V vs 4.096 V) must be considered in the target design.
Can the ADR4525ARZ-R7 be used as a drop-in replacement for the ADR4540BRZ?
No, not as a direct drop-in replacement. Although both are 8-lead SOIC devices with the same pinout and 2 ppm/°C maximum temperature coefficient, the ADR4525ARZ-R7 provides a 2.5 V output while the ADR4540BRZ provides a 4.096 V output. The output voltage difference affects ADC/DAC reference scaling and system calibration, so the design must be revalidated before substitution.
What is the initial accuracy of each device?
The ADR4525ARZ-R7 (A grade) has an initial accuracy of ±0.04% maximum. The ADR4540BRZ (B grade) has an initial accuracy of ±0.02% maximum. Both specifications are stated at 25°C per the Analog Devices datasheet.
What is the maximum temperature coefficient of these voltage references?
Both the ADR4525ARZ-R7 and ADR4540BRZ are specified with a maximum temperature coefficient of 2 ppm/°C over the −40°C to +125°C operating temperature range, per the Analog Devices ADR4525/ADR4540 datasheet.
What are the supply voltage and operating current requirements?
Both devices operate from a supply voltage of 3 V to 15 V (VIN) and are specified for operation over the −40°C to +125°C temperature range. The quiescent supply current is typically 950 µA maximum per the datasheet. The minimum supply headroom must accommodate the respective output voltage: 2.5 V for the ADR4525ARZ-R7 and 4.096 V for the ADR4540BRZ.
How does the packaging differ between the ADR4525ARZ-R7 and ADR4540BRZ?
The ADR4525ARZ-R7 suffix "R7" denotes tape-and-reel packaging (7-inch reel) for automated assembly. The ADR4540BRZ is supplied in tube packaging. Both use the same 8-lead SOIC (R-8) body, so the PCB footprint is identical; only the shipping format differs.
What are typical applications for these voltage references?
Both the ADR4525ARZ-R7 and ADR4540BRZ are precision voltage references suited for high-resolution data acquisition systems, precision ADC and DAC reference inputs, industrial instrumentation, and test and measurement equipment. The 4.096 V output of the ADR4540BRZ aligns with 12-/16-bit ADC full-scale ranges, while the 2.5 V output of the ADR4525ARZ-R7 suits lower full-scale reference requirements.