Part A
ADR420BRZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6197 PCS
- Package
- SOIC-8
- Series
- PMIC - Voltage Reference
Replacement verdict
Compatible functional replacement candidate
The ADR420BRZ and ADR420AR are functionally compatible voltage reference ICs sharing the same 2.048 V output, series topology, and SOIC-8 footprint, making the ADR420AR a viable drop-in candidate for the ADR420BRZ in most designs. The primary distinction is grade-level accuracy: the BRZ offers tighter initial tolerance and lower temperature coefficient, so applications with stringent precision budgets should validate the relaxed specifications of the AR before substitution.
Output Voltage
High match
Package Type
High match
Initial Accuracy
Validation required
Temperature Coefficient
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR420BRZ | ADR420AR | Why it matters |
|---|---|---|---|
| Initial Accuracy (Vout) | ±1 mV (max, ±0.05%) | ±2 mV (max, ±0.1%) | Tighter initial tolerance reduces system calibration effort and improves absolute output accuracy. |
| Temperature Coefficient | 3 ppm/°C (max, B grade) | 10 ppm/°C (max, A grade) | Lower tempco keeps the reference stable over temperature, critical for precision measurement and industrial applications. |
| Grade / Accuracy Class | B grade (high precision) | A grade (standard precision) | Grade determines guaranteed limits on accuracy and drift; B grade is a higher-performance bin than A grade. |
| Output Voltage | 2.048 V | 2.048 V | Both provide the same nominal reference voltage, so the output range is directly compatible. |
| Package | 8-Lead SOIC (RZ) | 8-Lead SOIC (R) | Identical package footprint allows drop-in board replacement without layout changes. |
| Supply Voltage Range | 4.0 V to 18 V | 4.0 V to 18 V | Same operating supply window ensures compatibility with the same system power rails. |
| Operating Temperature Range | −40 °C to +125 °C | −40 °C to +125 °C | Matching temperature ratings confirm both parts suit the same environmental conditions. |
| Output Current Capability | ±10 mA (source/sink) | ±10 mA (source/sink) | Same drive capability means both can support comparable load conditions in the target circuit. |
| Low-Frequency Noise | 1.75 µV p-p (0.1 Hz to 10 Hz, typ) | 1.75 µV p-p (0.1 Hz to 10 Hz, typ) | Equivalent noise performance preserves signal integrity in precision analog front ends. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR420BRZ | ADR420AR |
|---|---|---|
| Series | XFET® | XFET® |
| Part Status | Active | Obsolete |
| Mounting Type | Surface Mount | Surface Mount |
| Reference Type | Series | - |
| Output Type | Fixed | - |
| Voltage - Output (Min/Fixed) | 2.048V | - |
| Current - Output | 10 mA | - |
| Tolerance | ±0.05% | - |
| Temperature Coefficient | 3ppm/°C | - |
| Noise - 01 Hzto10 Hz | 1.75µVp-p | - |
| Voltage - Input | 4V ~ 18V | - |
| Supply Current | 600µA | - |
| Operating Temperature | -40°C ~ 125°C (TA) | - |
Frequently asked questions
What is the main difference between the ADR420BRZ and ADR420AR?
The primary difference is the initial accuracy grade. The ADR420BRZ (B grade) offers a tighter initial output voltage tolerance of ±0.04% maximum, while the ADR420AR (A grade) specifies ±0.1% maximum. Both are 2.048 V precision voltage references in an 8-lead SOIC package.
Are the ADR420BRZ and ADR420AR pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions, so they are pin-compatible and share the same PCB land pattern.
What is the output voltage of the ADR420BRZ and ADR420AR?
Both devices provide a fixed 2.048 V output. The ADR420BRZ specifies ±0.04% maximum initial accuracy, and the ADR420AR specifies ±0.1% maximum initial accuracy at 25°C.
Do the ADR420BRZ and ADR420AR differ in temperature coefficient?
Yes. The ADR420BRZ (B grade) is specified with a maximum temperature coefficient of 3 ppm/°C, while the ADR420AR (A grade) is specified with a maximum temperature coefficient of 10 ppm/°C over the operating temperature range.
Can the ADR420AR be used as a drop-in replacement for the ADR420BRZ?
They are pin-compatible, but the ADR420AR has wider initial accuracy (±0.1% vs ±0.04%) and temperature coefficient (10 ppm/°C vs 3 ppm/°C) tolerances. A replacement is acceptable only if the looser specifications still meet the design's error budget; otherwise the B grade should be retained.
What are the operating temperature ranges of the ADR420BRZ and ADR420AR?
Both grades are specified over the extended industrial temperature range of −40°C to +125°C, with their respective accuracy and temperature coefficient limits applying across that range.
Do both devices share the same long-term drift and noise specifications?
Both are members of the ADR420 family and share the same typical long-term drift and low-frequency noise characteristics. The graded differences between the B and A versions are confined to initial accuracy and temperature coefficient, so design calculations for drift and noise can use the same family data for either grade.