Part A
ADR420BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6197 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Compatible functional replacement candidate
The ADR420BRZ and ADR425BR-REEL7 are both precision voltage references from the same ADR42x family, sharing a common SOIC-8 footprint and series-mode topology, but they differ in output voltage and initial accuracy grade. The ADR425BR-REEL7 can serve as a functional substitute for the ADR420BRZ only where the higher 5.0 V reference and the corresponding accuracy and temperature coefficient specifications are acceptable; designers must revalidate the output voltage, accuracy grade, and thermal drift against the target circuit before committing to a drop-in replacement.
Output Voltage
Validation required
Initial Accuracy Grade
Validation required
Package Type
High match
Temperature Coefficient
Validation required
Parts at a glance
Part B
ADR425BR-REEL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4500 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
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 | ADR425BR-REEL7 | Why it matters |
|---|---|---|---|
| Output Voltage | 2.048 V | 5.000 V | The reference voltage sets the full-scale range of the ADC/DAC; a different value changes system scaling and cannot be substituted without recalibration. |
| Initial Accuracy | ±0.05% (B grade) | ±0.04% (B grade) | Initial tolerance directly affects absolute accuracy of the measurement system at room temperature. |
| Temperature Coefficient | 3 ppm/°C (B grade) | 3 ppm/°C (B grade) | Drift over temperature determines accuracy stability across the operating range; matching values ease substitution. |
| Output Current Capability | ±10 mA | ±10 mA | Determines the load the reference can drive while maintaining regulation; identical capability supports similar loading. |
| Supply Voltage Range | 4.5 V to 18 V | 7.0 V to 18 V | The minimum supply headroom differs; a 5 V output part requires higher supply, affecting compatibility with low-voltage rails. |
| Supply Current | 0.8 mA typ | 0.8 mA typ | Quiescent current impacts power budget in portable and low-power designs; matching values preserve consumption. |
| Output Noise (0.1–10 Hz) | 1.75 µV p-p typ | 3.4 µV p-p typ | Low-frequency noise limits resolution in precision DC measurements; differing noise affects achievable accuracy. |
| Long-Term Drift | 50 ppm/1000 hr | 50 ppm/1000 hr | Long-term stability affects calibration intervals and lifetime accuracy; identical drift supports similar reliability. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Footprint and pinout compatibility enable drop-in replacement on the same PCB layout. |
| Operating Temperature Range | −40 °C to +125 °C | −40 °C to +125 °C | Defines the environments where the part is guaranteed to meet specifications; matching ranges support equivalent applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR420BRZ | ADR425BR-REEL7 |
|---|---|---|
| Series | XFET® | XFET® |
| Part Status | Active | Obsolete |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 2.048V | 5V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.05% | ±0.04% |
| Temperature Coefficient | 3ppm/°C | 3ppm/°C |
| Noise - 01 Hzto10 Hz | 1.75µVp-p | 3.4µVp-p |
| Voltage - Input | 4V ~ 18V | 7V ~ 18V |
| Supply Current | 600µA | 600µA |
| 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 ADR420BRZ and ADR425BR-REEL7 voltage references?
The ADR420BRZ is a 2.048 V precision voltage reference in an 8-lead SOIC package, while the ADR425BR-REEL7 is a 5.000 V precision voltage reference in an 8-lead SOIC package supplied on tape and reel. Both are members of Analog Devices' ADR42x series 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?
Both the ADR420BRZ and ADR425BR-REEL7 are B-grade devices offering ±0.04% initial accuracy and a temperature coefficient of 3 ppm/°C maximum over the −40°C to +125°C operating range, per the Analog Devices ADR420/ADR425 datasheet.
What output voltage does each device provide?
The ADR420BRZ provides a fixed 2.048 V output, and the ADR425BR-REEL7 provides a fixed 5.000 V output. The output voltage is set internally and cannot be adjusted externally.
Are the ADR420BRZ and ADR425BR-REEL7 pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with an identical pinout, so they are pin-compatible. However, because their output voltages differ (2.048 V vs. 5.000 V), they are not electrically interchangeable in a given design without verifying that the system tolerates the different reference voltage.
What are the noise and long-term stability specifications for these references?
Per the Analog Devices datasheet, both the ADR420 and ADR425 exhibit low output noise of 1.75 µV p-p (0.1 Hz to 10 Hz) typical and long-term stability of 50 ppm typical per 1,000 hours. These specifications are common to the ADR42x family and apply to both the ADR420BRZ and ADR425BR-REEL7.
What is the difference between the "BRZ" and "BR-REEL7" ordering suffixes?
The "BRZ" suffix on ADR420BRZ denotes a B-grade device in an 8-lead SOIC package supplied in tube form. The "BR-REEL7" suffix on ADR425BR-REEL7 denotes a B-grade device in the same 8-lead SOIC package supplied on a 7-inch tape and reel. The electrical grade and package are equivalent; only the shipping format differs.
What supply voltage and current do these references require?
Both the ADR420BRZ and ADR425BR-REEL7 operate from a supply voltage of 3.0 V to 18 V and typically draw 800 µA of quiescent current, according to the Analog Devices ADR420/ADR425 datasheet. The ADR425 requires a supply voltage at least 2 V above its 5.000 V output, so a minimum supply of approximately 7 V is needed for proper regulation.
Can the ADR420BRZ be used as a drop-in replacement for the ADR425BR-REEL7?
No. Although both are pin-compatible 8-lead SOIC B-grade references, the ADR420BRZ outputs 2.048 V while the ADR425BR-REEL7 outputs 5.000 V. A direct substitution would change the reference voltage by more than a factor of two and is not valid without redesigning or recalibrating the surrounding circuit.