Part A
AD9744ARU
ADI公司
- Lifecycle
- Active
- Stock
- 5441 件
- Package
- TSSOP-28
- Series
- 資料獲取-數模轉換器（DAC）
Replacement verdict
Compatible functional replacement candidate
The AD9744ARU and AD9744AR are functionally compatible 14-bit current-output DACs from the same AD9744 family, sharing identical resolution, converter architecture, and electrical performance. The primary distinction is the package and thermal interface: the AD9744ARU is supplied in a TSSOP-28 package, while the AD9744AR is supplied in a SOIC-28 package. Both parts are electrically interchangeable in terms of core DAC function, but the differing package footprint and thermal characteristics require layout validation before substitution.
Resolution and DAC Architecture
High match
Package Type
Not compatible
Electrical Performance
High match
Thermal Characteristics
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9744ARU | AD9744AR | Why it matters |
|---|---|---|---|
| Package / Case | 28-TSSOP (Thin Shrink Small Outline Package) | 28-SOIC (Small Outline Integrated Circuit) | The package footprint and pin pitch differ, so the two parts are not drop-in board-level substitutes; PCB layout and assembly must match the specific package. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, but the differing body width and lead spacing still require distinct land patterns. |
| Pin Count | 28 | 28 | Identical pin count means the same signal assignment is preserved, but physical pin spacing differs between TSSOP and SOIC. |
| Body Width | 4.4 mm (TSSOP) | 7.5 mm (SOIC) | The narrower TSSOP body saves board area, while the wider SOIC body affects routing density and thermal spreading. |
| Lead Pitch | 0.65 mm | 1.27 mm | Finer lead pitch in TSSOP requires tighter manufacturing tolerances and different stencil/solder paste design than the SOIC. |
| Thermal Resistance (θJA) | Typically higher (smaller body) | Typically lower (larger body) | Thermal performance affects power dissipation headroom and long-term reliability in high-speed DAC applications. |
| Moisture Sensitivity Level (MSL) | MSL 1 (typical for TSSOP) | MSL 1 (typical for SOIC) | MSL governs floor life and baking requirements before reflow; both are typically MSL 1 but should be confirmed per datasheet. |
| Resolution | 14-bit | 14-bit | Identical resolution confirms the same digital input word width and quantization performance. |
| Update Rate | 210 MSPS | 210 MSPS | Same maximum sample rate means equivalent dynamic performance for high-speed signal synthesis. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature range supports the same application environments. |
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 | AD9744ARU | AD9744AR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | TxDAC® | TxDAC® |
| Part Status | Obsolete | Obsolete |
Frequently asked questions
What is the difference between the AD9744ARU and AD9744AR?
Both are 14-bit, 210 MSPS TxDAC digital-to-analog converters from Analog Devices. The AD9744ARU is supplied in a 28-lead TSSOP package, while the AD9744AR is supplied in a 28-lead SOIC package. The core die and specified electrical performance are the same; the difference is package type and corresponding thermal/board layout characteristics.
Are the AD9744ARU and AD9744AR electrically identical?
Yes. Both variants share the same 14-bit resolution, 210 MSPS maximum update rate, and 3.0 V to 3.6 V supply range per the Analog Devices datasheet. The functional block diagram, pin functions, and transfer characteristics are identical; only the package outline and thermal resistance differ.
Can the AD9744ARU be used as a drop-in replacement for the AD9744AR?
No, not as a drop-in replacement. Although the electrical function is the same, the AD9744ARU is a 28-lead TSSOP and the AD9744AR is a 28-lead SOIC. The PCB land patterns, package footprint, and thermal performance differ, so the board must be redesigned or an appropriate adapter used.
What is the pin count and package of each device?
The AD9744ARU uses a 28-lead TSSOP (RU suffix). The AD9744AR uses a 28-lead SOIC (R suffix). Both are 28-pin devices with the same pin functions, but the physical package dimensions and lead pitch differ.
Do both parts support the same supply voltage and update rate?
Yes. Per the Analog Devices AD9744 datasheet, both the AD9744ARU and AD9744AR operate from a 3.0 V to 3.6 V analog and digital supply and support a maximum update rate of 210 MSPS. The package variant does not change these specified operating conditions.
Which package should be selected for better thermal performance?
The 28-lead TSSOP (AD9744ARU) generally offers a smaller footprint, while the 28-lead SOIC (AD9744AR) provides a larger body for heat spreading. The appropriate choice depends on the board's thermal design and the power dissipation at the target update rate; consult the datasheet thermal resistance values for each package.
Are both variants available in the same temperature grade?
Both the AD9744ARU and AD9744AR are specified over the industrial temperature range of -40°C to +85°C per the Analog Devices datasheet. The package suffix does not alter the specified operating temperature range.
Is the AD9744ARU RoHS compliant like the AD9744AR?
RoHS compliance is determined by the specific orderable part number and its suffix, not solely by the package family. Verify the exact ordering code on the Analog Devices product page or an authorized distributor listing before assuming compliance for either variant.