Part A
AD780ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3641 Stückzahl
- Package
- SOIC-8
- Series
- PMIC Spannung Referenz
Replacement verdict
Compatible functional replacement candidate
The AD780BRZ-REEL and AD780ARZ are functionally compatible voltage references sharing the same package, pinout, output configuration, and temperature range, with the BRZ grade offering tighter initial accuracy and lower temperature coefficient than the ARZ grade. The AD780BRZ-REEL is a valid functional replacement candidate for the AD780ARZ where improved reference precision is acceptable or beneficial, though designers should confirm that the tighter grade specifications and reel packaging align with their application and assembly requirements.
Output Voltage & Type
High match
Package & Pinout
High match
Initial Accuracy & Tempco Grade
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
AD780BRZ-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6342 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 | AD780BRZ-REEL | AD780ARZ | Why it matters |
|---|---|---|---|
| Initial Accuracy | ±1 mV (max) | ±2 mV (max) | Tighter initial accuracy reduces or eliminates the need for system calibration and directly affects output voltage precision at power-up. |
| Temperature Coefficient | 3 ppm/°C (max) | 7 ppm/°C (max) | Lower tempco means the reference voltage drifts less over temperature, which is critical for precision measurement and data acquisition accuracy. |
| Output Voltage | 2.5 V or 3.0 V (pin-selectable) | 2.5 V or 3.0 V (pin-selectable) | The selectable output voltage determines compatibility with the ADC or DAC reference input range in the target design. |
| Output Current Capability | ±10 mA | ±10 mA | Source/sink current capability determines whether the reference can drive the load directly without an external buffer. |
| Supply Voltage Range | 4.0 V to 36 V | 4.0 V to 36 V | The input supply range must cover the system rail to ensure proper regulation and avoid damage across operating conditions. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical package and pinout allow drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must match the application environment to guarantee specified performance over the full operating envelope. |
| Grade / Accuracy Class | B grade (higher precision) | A grade (standard precision) | The grade determines guaranteed accuracy and drift limits; substituting a lower grade may violate system error budget requirements. |
| Packaging / Delivery Form | Tape and reel | Tube / tray | Packaging form affects automated assembly line compatibility and inventory handling, though not electrical performance. |
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 | AD780ARZ | AD780BRZ-REEL |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series, Shunt | Series, Shunt |
| Output Type | Programmable | Programmable |
| Voltage - Output (Min/Fixed) | ±2.5V, ±3V | ±2.5V, ±3V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.2%, ±0.17% | ±0.04%, ±0.03% |
| Temperature Coefficient | 7ppm/°C | 3ppm/°C |
| Noise - 01 Hzto10 Hz | 4µVp-p | 4µVp-p |
| Voltage - Input | 4V ~ 36V | 4V ~ 36V |
| Supply Current | 1mA | 1mA |
| Current - Cathode | 1 mA | 1 mA |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD780BRZ-REEL and the AD780ARZ?
Both devices are 2.5 V/3.0 V ultrahigh precision bandgap voltage references in an 8-lead SOIC package. The primary difference is the grade: the AD780BRZ-REEL is the B-grade with tighter initial accuracy and lower temperature coefficient, while the AD780ARZ is the A-grade with wider specified tolerances. The "-REEL" suffix indicates tape-and-reel packaging, whereas the AD780ARZ is typically supplied in tube form.
What initial output voltage accuracy does each grade specify?
The AD780B grade specifies an initial accuracy of ±1 mV maximum at 2.5 V output, while the AD780A grade specifies ±2 mV maximum. Both grades also support a 3.0 V output mode via the appropriate pin configuration.
How do the temperature coefficient specifications compare between the two grades?
The AD780B grade is specified with a temperature coefficient of 3 ppm/°C maximum, whereas the AD780A grade is specified at 7 ppm/°C maximum over the operating temperature range. This makes the B grade preferable for applications requiring tighter drift performance.
Are the AD780BRZ-REEL and AD780ARZ pin-compatible and functionally interchangeable?
Yes. Both parts share the same 8-lead SOIC pinout and identical functional architecture, including the 2.5 V/3.0 V selectable output, trim capability, and temperature output pin. They are functionally interchangeable, but the B grade offers tighter accuracy and drift specifications than the A grade.
What is the significance of the "-REEL" suffix on the AD780BRZ-REEL?
The "-REEL" suffix denotes tape-and-reel packaging, which is intended for automated pick-and-place assembly lines. The AD780ARZ without a reel suffix is typically supplied in tube packaging. The electrical specifications are determined by the grade letter (B or A), not by the packaging suffix.
What are the specified operating temperature ranges and long-term stability for these references?
Both the AD780A and AD780B grades are specified over the extended industrial temperature range of −40°C to +85°C. Long-term stability is typically specified at 25 ppm per 1000 hours for both grades, making them suitable for precision instrumentation and data acquisition systems.
Can the AD780ARZ be used as a drop-in replacement for the AD780BRZ-REEL in an existing design?
Because both parts are pin-compatible and functionally identical, the AD780ARZ can be used in place of the AD780BRZ-REEL where the wider initial accuracy (±2 mV vs ±1 mV) and higher temperature coefficient (7 ppm/°C vs 3 ppm/°C) are acceptable. Designs requiring the tighter B-grade performance should retain the AD780BRZ-REEL.