Part A
AD780ARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3641 PCS
- Package
- SOIC-8
- Series
- PMIC - référence de tension
Replacement verdict
Not a drop-in replacement
The AD780ARZ and AD7805BR-REEL are not functionally interchangeable. The AD780ARZ 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 a 28-lead SSOP. They differ in core function, channel count, package footprint, and digital interface, so substituting one for the other is not feasible without a complete circuit redesign.
Different device function
Different channel count
Different package footprint
Different digital interface
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 | AD780ARZ | AD7805BR-REEL | Why it matters |
|---|---|---|---|
| Function / Type | Voltage reference (2.5 V / 3.0 V selectable) | Quad 10-bit voltage-output DAC | These are fundamentally different device classes, so they are not functionally substitutable in a design. |
| Output Type | Fixed reference voltage output | Digital-to-analog converter outputs | A reference provides a stable DC level, while a DAC converts digital codes to analog levels; the roles differ completely. |
| Number of Channels / Outputs | 1 reference output | 4 DAC outputs | Channel count determines how many independent signals the part can provide in a system. |
| Resolution | Not applicable (analog reference) | 10 bits | Resolution defines the number of discrete output levels a DAC can produce; a reference has no such quantization. |
| Interface | None (analog device) | Parallel digital interface | A digital interface is required to load codes into a DAC, whereas a reference needs no data bus. |
| Supply Voltage | 4.0 V to 36 V input range | 5 V single supply (nominal) | Supply requirements determine power-rail compatibility and whether the part fits the target system. |
| Package | 8-lead SOIC | 28-lead SOIC | Package footprint and pin count affect PCB layout and cannot be interchanged without redesign. |
| Typical Application | Precision voltage reference for ADCs/DACs and instrumentation | Multi-channel analog output generation and control | Intended use cases highlight that these parts serve different roles in a signal chain. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD780ARZ | 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 | ±0.2%, ±0.17% | - |
| Temperature Coefficient | 7ppm/°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 AD780ARZ and AD7805BR-REEL functionally interchangeable?
No. The AD780ARZ 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 functional classes of devices and cannot be substituted for one another.
What are the primary functions of each device?
The AD780ARZ is a precision bandgap voltage reference offering selectable 2.5 V or 3.0 V outputs with low temperature drift. The AD7805BR-REEL is a quad, 10-bit, voltage-output digital-to-analog converter with a parallel interface, intended for multi-channel analog output applications.
How do the package and pin count differ between the two parts?
The AD780ARZ is supplied in an 8-lead SOIC package. The AD7805BR-REEL is supplied in a 28-lead SOIC package. The differing pin counts and pin functions prevent any PCB footprint or pin-level compatibility between the two devices.
Do the two parts share the same supply voltage requirements?
No. The AD780ARZ operates from a supply range of approximately 4.0 V to 36 V, supporting both 5 V and higher-voltage systems. The AD7805BR-REEL operates from a 5 V supply (with a 3 V option in some grades). The supply requirements are therefore not equivalent.
Which device is suitable for providing a stable reference to an ADC or DAC?
The AD780ARZ is the appropriate choice, as it is a dedicated precision voltage reference with low output noise and tight initial accuracy. The AD7805BR-REEL is itself a DAC and is not a reference source.
Which device provides multiple analog output channels?
The AD7805BR-REEL provides four independent 10-bit voltage-output DAC channels. The AD780ARZ provides a single reference output and has no DAC channels.
Are the operating temperature ranges of the two devices the same?
Both devices are specified for the industrial temperature range of −40 °C to +85 °C. However, because they are different device types, the temperature specifications apply to different parameters (reference drift versus DAC linearity) and should be evaluated separately.
Can the AD780ARZ be used as the reference for the AD7805BR-REEL in a system design?
Yes, in principle a precision reference such as the AD780ARZ can supply an external reference voltage to a DAC like the AD7805BR-REEL, provided the reference output voltage and drive capability meet the DAC's reference input requirements as stated in the respective datasheets. This is a system-level design consideration, not a substitution.