Part A
AD780BRZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3229 PCS
- Package
- SOIC-8
- Series
- PMIC - référence de tension
Replacement verdict
Not a drop-in replacement
The AD780BRZ and AD7805BR-REEL are not functionally interchangeable. The AD780BRZ is a precision 2.5 V/3.0 V voltage reference in an SOIC-8 package, while the AD7805BR-REEL is a quad 10-bit voltage-output DAC in an SSOP-28 package. They differ in core function, channel count, package footprint, and interface architecture, so substitution requires a complete circuit redesign rather than a direct swap.
Different device function
Different channel count
Different package footprint
Different interface architecture
Parts at a glance
Part B
AD7805BR-REEL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 900 PCS
- Package
- SOIC-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
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 | AD7805BR-REEL | Why it matters |
|---|---|---|---|
| Function / Type | Voltage reference (2.5 V / 3.0 V ultrahigh precision) | 10-bit quad voltage-output DAC | These are fundamentally different device classes; a reference IC cannot substitute for a DAC, so functional substitutability is not possible. |
| Output Type | Fixed voltage reference output | Voltage output (DAC) | The output signal type determines whether the part can drive the intended circuit node. |
| Number of Channels / Outputs | 1 reference output | 4 DAC outputs | Channel count affects how many independent signals the device can generate or supply. |
| Resolution / Accuracy Class | 2.5 V / 3.0 V reference with high initial accuracy | 10-bit DAC resolution | Resolution and accuracy define the precision of the output, which is central to matching system requirements. |
| Supply Voltage Range | 4.0 V to 36 V input | 5 V single supply (nominal) | Supply compatibility determines whether the part can operate in the target power rail environment. |
| Package | 8-lead SOIC | 28-lead SOIC (wide body) | Package footprint and pin count must match the PCB layout for a drop-in replacement. |
| Interface | Analog (no digital interface) | Parallel digital interface | The interface type dictates how the device is controlled and whether it fits the host system architecture. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range must cover the application environment for reliable operation. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD780BRZ | AD7805BR-REEL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | - | 10 |
| Reference Type | Series, Shunt | - |
| Output Type | Programmable | - |
| Voltage - Output (Min/Fixed) | ±2.5V, ±3V | - |
| Current - Output | 10 mA | - |
| Tolerance | ±0.04%, ±0.03% | - |
| Temperature Coefficient | 3ppm/°C | - |
| Noise - 01 Hzto10 Hz | 4µVp-p | - |
| Voltage - Input | 4V ~ 36V | - |
| Supply Current | 1mA | - |
| Current - Cathode | 1 mA | - |
| Operating Temperature | -40°C ~ 85°C (TA) | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
Are the AD780BRZ and AD7805BR-REEL functionally interchangeable?
No. The AD780BRZ is a 2.5 V/3.0 V high-precision voltage reference in an 8-lead SOIC package, while the AD7805BR-REEL is a quad 10-bit voltage-output DAC in a 28-lead SOIC package. They are different device categories and cannot be substituted for one another.
What is the primary function of the AD780BRZ?
The AD780BRZ is a precision bandgap voltage reference offering selectable 2.5 V or 3.0 V output, with initial accuracy grades and low temperature drift, intended for use as a reference source in data acquisition and converter circuits.
What is the primary function of the AD7805BR-REEL?
The AD7805BR-REEL is a quad, 10-bit, voltage-output digital-to-analog converter (DAC) that includes an on-chip reference and output amplifiers, supplied in a 28-lead SOIC package and delivered on tape and reel.
Do the two parts use the same package and pinout?
No. The AD780BRZ uses an 8-lead SOIC (R-8) package, whereas the AD7805BR-REEL uses a 28-lead SOIC (R-28) package. Pin counts, pin functions, and PCB land patterns differ, so they are not footprint-compatible.
Can the AD780BRZ serve as the reference for the AD7805BR-REEL in a design?
The AD7805BR-REEL already integrates an on-chip reference, so an external AD780BRZ is not required for basic operation. Whether an external precision reference is beneficial depends on the accuracy and drift requirements of the specific application and must be evaluated against the AD7805 datasheet specifications.
How do the supply voltage requirements compare?
The AD780BRZ operates from a wide supply range suitable for 5 V and 3 V systems, while the AD7805BR-REEL is specified for 5 V operation with its on-chip reference and output amplifiers. Designers should confirm exact supply limits and conditions in the respective manufacturer datasheets.
Which part is appropriate for a multi-channel analog output application?
The AD7805BR-REEL is the appropriate choice because it provides four independent 10-bit voltage-output DAC channels in a single package. The AD780BRZ is a voltage reference only and provides no DAC channels.
Are both parts available in production quantities on tape and reel?
The AD7805BR-REEL suffix explicitly denotes tape-and-reel packaging. The AD780BRZ is supplied in tube or tray packaging depending on the ordering code; buyers should verify the specific packaging option with the distributor or manufacturer before ordering production volumes.