Part A
AD974ARSZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5700 PCS
- Package
- SSOP-28
- Series
- Acquisition de données - ADC DAC - dédié
Replacement verdict
Compatible functional replacement candidate
The AD974ARSZ and AD974BRS are functionally interchangeable 4-channel 16-bit data acquisition systems in identical 28-lead SOIC packages, sharing the same supply, reference, and interface architecture. The AD974BRS is specified over the extended industrial temperature range, making it the more robust choice for wide-temperature applications, while the AD974ARSZ covers the standard industrial range. Both parts are viable substitutes with validation recommended for the temperature-dependent specifications.
Package Type
High match
Resolution and Channel Count
High match
Supply and Interface
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
AD974BRS
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4896 PCS
- Package
- SSOP-28
- Series
- Acquisition de données - ADC DAC - dédié
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD974ARSZ | AD974BRS | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both parts share the same resolution, so conversion accuracy in bits is equivalent. |
| Sampling Rate | 200 kSPS | 200 kSPS | Identical throughput means either part can meet the same data acquisition timing requirements. |
| Number of Input Channels | 4 single-ended | 4 single-ended | Same channel count allows direct substitution in multi-channel acquisition designs. |
| Interface Type | Serial (SPI/QSPI/MICROWIRE/DSP compatible) | Serial (SPI/QSPI/MICROWIRE/DSP compatible) | Matching serial interface ensures the same host controller and firmware can drive either device. |
| Supply Voltage | 5 V | 5 V | Same supply requirement means the power design does not need to change between parts. |
| Package / Mounting | 28-Lead SSOP (RS-28), Surface Mount | 28-Lead SSOP (RS-28), Surface Mount | Identical package and footprint allow drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range means both parts suit the same environmental conditions. |
| Grade / Accuracy Class | A grade | B grade | The B grade typically offers tighter linearity/accuracy specifications than the A grade, which can affect precision-critical applications. |
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 | AD974ARSZ | AD974BRS |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Data Acquisition System (DAS) | Data Acquisition System (DAS) |
| Number of Channels | 4 | 4 |
| Resolution(Bits) | 16 b | 16 b |
| Sampling Rate(Per Second) | 200k | 200k |
| Data Interface | Serial | Serial |
| Voltage Supply Source | Analog and Digital | Analog and Digital |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the AD974ARSZ and AD974BRS, and how do they differ in grade?
Both are 4-channel, 16-bit, 200 kSPS successive-approximation analog-to-digital converters from Analog Devices in a 28-lead SSOP package. The AD974ARSZ is the A-grade version, while the AD974BRS is the B-grade version; the two grades differ in specified accuracy and linearity performance per the AD974 datasheet.
Are the AD974ARSZ and AD974BRS pin-compatible and package-compatible?
Yes. Both devices are offered in the same 28-lead SSOP (RS) package with identical pin functions, so they are pin-compatible and share the same PCB land pattern.
Do the AD974ARSZ and AD974BRS share the same resolution, sample rate, and input configuration?
Yes. Both are 16-bit SAR ADCs with a maximum throughput of 200 kSPS and provide four input channels, with the same analog input architecture and serial interface as defined in the AD974 datasheet.
What supply and reference requirements apply to both the AD974ARSZ and AD974BRS?
Both devices operate from a single 5 V analog supply and a separate digital supply, and require an external reference; the AD974 datasheet specifies the nominal +2.5 V reference and the associated supply and reference ranges for proper operation.
How do the AD974ARSZ and AD974BRS differ in specified performance?
The A and B grades are distinguished by their guaranteed specifications, such as integral and differential nonlinearity and offset/gain error limits, as listed in the AD974 datasheet grade-selection table. The B-grade device carries tighter guaranteed limits than the A-grade device.
Can the AD974BRS be used as a drop-in replacement for the AD974ARSZ?
Because both are the same converter in the same 28-lead SSOP package with identical pinout and interface, the B-grade device can generally serve in place of the A-grade device where its tighter guaranteed specifications meet the design requirements; the substitution should be confirmed against the AD974 datasheet grade specifications and the application's accuracy budget.
What interface do the AD974ARSZ and AD974BRS provide for connecting to a host processor?
Both devices provide a high-speed serial interface for conversion results and configuration, allowing connection to DSPs and microcontrollers; the AD974 datasheet defines the serial timing, word length, and control signals used by both grades.