Part A
AD974ARSZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5700 PCS
- Package
- SSOP-28
- Series
- Acquisition de données - ADC DAC - dédié
Replacement verdict
Not a drop-in replacement
The AD974ARSZ and AD9742ARU are not drop-in replacements for one another. Although both are 14-bit high-speed current-output DACs, they differ in resolution-critical architecture, package footprint, and interface timing, so substituting one for the other requires board redesign and firmware validation rather than direct replacement.
Different package footprint
Different resolution
Different interface timing
Different reference architecture
Parts at a glance
Part B
AD9742ARU
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5081 PCS
- Package
- TSSOP-28
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
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 | AD9742ARU | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Bit depth determines quantization accuracy and achievable SNR; a 14-bit DAC offers finer output steps than a 12-bit DAC, so they are not functionally interchangeable in precision applications. |
| Number of D/A Converters | 1 | 1 | Both are single-channel DACs, so channel count is compatible for single-output designs. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Both provide unbuffered current outputs, requiring an external op-amp for voltage conversion; matching output architecture simplifies substitution. |
| Data Interface | Parallel | Parallel | Both use a parallel interface, so the host-side digital connection scheme is compatible. |
| Package / Case | 28-SSOP | 28-TSSOP | Different package footprints require different PCB land patterns, so a board redesign or adapter is needed for substitution. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, compatible with SMT assembly processes. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | Identical industrial temperature ranges mean both suit the same environmental conditions. |
| Supply Voltage | 2.7V to 5.5V | 2.7V to 5.5V | Matching supply ranges allow both parts to operate from the same power rail without redesign. |
| Reference Type | External, Internal | External, Internal | Both support internal and external references, giving equivalent flexibility in reference design. |
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 | AD9742ARU |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Analog Devices Inc. |
| Series | - | TxDAC® |
| Part Status | Active | Active |
| Number of Bits | - | 12 |
| Number of D/A Converters | - | 1 |
| Settling Time | - | 11ns (Typ) |
| Output Type | - | Current - Unbuffered |
| Differential Output | - | Yes |
| Data Interface | Serial | Parallel |
| Reference Type | - | External, Internal |
| Voltage - Supply, Analog | - | 2.7V ~ 3.6V |
| Voltage - Supply, Digital | - | 2.7V ~ 3.6V |
| INL / DNL(LSB) | - | ±0.5, ±0.4 |
| Architecture | - | Current Source |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Type | Data Acquisition System (DAS) | - |
| Number of Channels | 4 | - |
| Resolution(Bits) | 16 b | - |
| Sampling Rate(Per Second) | 200k | - |
| Voltage Supply Source | Analog and Digital | - |
| Voltage - Supply | 4.75V ~ 5.25V | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
Are the AD974ARSZ and AD9742ARU interchangeable in an existing design?
No, they are not directly interchangeable. The AD974ARSZ is a 4-channel, 16-bit serial 200 kSPS ADC in a 28-lead SSOP package, while the AD9742ARU is a single-channel, 12-bit parallel 210 MSPS ADC in a 28-lead TSSOP package. They differ in resolution, channel count, interface type, speed, and package footprint, so a direct drop-in replacement is not possible.
What are the key resolution and channel-count differences between the AD974ARSZ and AD9742ARU?
The AD974ARSZ provides 16-bit resolution with four input channels, whereas the AD9742ARU provides 12-bit resolution with a single input channel. These differences make the AD974ARSZ suited to multichannel high-resolution data acquisition, and the AD9742ARU suited to high-speed single-channel signal conversion.
How do the digital interfaces of the AD974ARSZ and AD9742ARU differ?
The AD974ARSZ uses a serial digital interface for data output, while the AD9742ARU uses a parallel digital interface. This affects the host controller pin count, timing, and PCB routing requirements, so the two parts cannot share the same digital interface without redesign.
What are the sampling-rate differences between the AD974ARSZ and AD9742ARU?
The AD974ARSZ is specified at 200 kSPS, while the AD9742ARU is specified at 210 MSPS. The AD9742ARU is therefore intended for high-speed conversion applications, whereas the AD974ARSZ targets lower-speed, high-resolution multichannel applications.
Do the AD974ARSZ and AD9742ARU use the same package and footprint?
No. The AD974ARSZ is supplied in a 28-lead SSOP package, and the AD9742ARU is supplied in a 28-lead TSSOP package. Because the package types and PCB land patterns differ, the two devices are not footprint-compatible and require different board layouts.
Can the AD974ARSZ and AD9742ARU be used in the same application?
They target different application classes. The AD974ARSZ is appropriate for multichannel, high-resolution, lower-speed data acquisition, while the AD9742ARU is appropriate for single-channel, high-speed conversion. Selecting between them depends on the required resolution, channel count, interface, and sampling rate of the target design.
What should be verified before considering either the AD974ARSZ or AD9742ARU for a design?
Verify the required resolution, channel count, sampling rate, digital interface type, supply and reference requirements, and package footprint against the respective manufacturer datasheets. Because the two parts differ in all of these areas, each must be evaluated independently against the system requirements rather than treated as equivalents.