Part A
AD9753ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4116 PCS
- Package
- LQFP-48
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9753ASTZ is a functionally compatible replacement candidate for the AD9753AST, sharing the same 14-bit 300 MSPS TxDAC architecture, 48-lead LQFP package, and pinout. The primary distinction is the RoHS-compliant lead-free construction of the ASTZ suffix versus the lead-containing AST version, which may require validation for legacy assembly processes and solder profile compatibility.
Resolution and Sample Rate
High match
Package and Pinout
High match
RoHS Compliance
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
AD9753AST
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3906 PCS
- Package
- LQFP-48
- Series
- Acquisição de dados - Convertedores digitais para analógicos (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 | AD9753ASTZ | AD9753AST | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Determines the quantization granularity of the DAC output; identical resolution means equivalent signal fidelity. |
| Number of DAC Channels | 1 | 1 | Defines how many independent analog outputs are available; both are single-channel, so channel count is interchangeable. |
| Sampling Rate | 300 MSPS | 300 MSPS | Sets the maximum update rate and usable output bandwidth; matching rates ensure equivalent dynamic performance. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Determines the interface to the analog front end; identical output type allows direct circuit substitution. |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Must match the system power rail; identical ranges mean the same supply design can be reused. |
| Package / Case | 48-LQFP | 48-LQFP | Footprint and pinout compatibility are essential for drop-in replacement on an existing PCB. |
| Mounting Type | Surface Mount | Surface Mount | Assembly method must match the board process; both being surface mount ensures manufacturing compatibility. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Defines the environmental envelope; identical ranges mean equivalent thermal robustness in the application. |
| Packaging / Ordering Suffix | Tray / Tube (Z = RoHS-compliant lead finish) | Tray / Tube (non-Z lead finish) | The Z suffix denotes RoHS-compliant lead finish; this affects regulatory compliance and solder process selection, though electrical function is the same. |
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 | AD9753ASTZ | AD9753AST |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | TxDAC+® | TxDAC+® |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | - |
| Number of D/A Converters | 1 | - |
| Settling Time | 11ns (Typ) | - |
| Output Type | Current - Unbuffered | - |
| Differential Output | Yes | - |
| Data Interface | Parallel | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 3V ~ 3.6V | - |
| Voltage - Supply, Digital | 3V ~ 3.6V | - |
| INL / DNL(LSB) | ±0.5, ±0.4 | - |
| Architecture | Current Source | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What is the difference between the AD9753ASTZ and the AD9753AST?
The AD9753ASTZ and AD9753AST are functionally identical 12-bit, 300 MSPS high-speed TxDAC+ digital-to-analog converters. The primary difference is the package/ordering suffix: the "Z" suffix on AD9753ASTZ denotes RoHS-compliant lead-free construction, while AD9753AST is the non-RoHS (leaded) version. Both are supplied in a 48-lead LQFP package and share the same electrical specifications.
Are the AD9753ASTZ and AD9753AST electrically and functionally interchangeable?
Yes. Both parts share the same 12-bit resolution, 300 MSPS maximum update rate, on-chip 1.2 V reference, and 48-lead LQFP pinout. The only documented distinction is the RoHS/lead-free status indicated by the "Z" suffix, so they are interchangeable in terms of electrical performance and PCB footprint.
What are the key performance specifications of the AD9753?
The AD9753 is a 12-bit, 300 MSPS TxDAC+ DAC with an on-chip 1.2 V bandgap reference and a differential current output. It operates from a single 3.0 V to 3.6 V supply (nominal 3.3 V) with a typical power dissipation of approximately 155 mW at 3.3 V. It is specified for SFDR and IMD performance suitable for wideband communications and instrumentation applications.
Does the "Z" suffix affect RoHS compliance and lead-free status?
Yes. The "Z" suffix in AD9753ASTZ designates the RoHS-compliant, lead-free (Pb-free) package variant, consistent with Analog Devices' standard ordering nomenclature. The AD9753AST is the earlier non-RoHS leaded version. Designs requiring RoHS compliance should specify AD9753ASTZ.
What package do the AD9753ASTZ and AD9753AST use, and is the footprint identical?
Both devices are offered in a 48-lead LQFP (low-profile quad flat package). Because the package body, lead count, and pin assignments are the same, the PCB land pattern and footprint are identical for both variants, allowing drop-in replacement on an existing layout.
What supply voltage and power consumption should be expected for these DACs?
The AD9753 family operates from a single supply of 3.0 V to 3.6 V (3.3 V nominal). Typical power dissipation is approximately 155 mW at 3.3 V. Designers should verify exact limits against the current Analog Devices datasheet for the specific grade and temperature range used.
Can the AD9753ASTZ be used as a direct replacement for an existing AD9753AST design?
Yes, provided the design does not require the non-RoHS leaded variant. Since both share the same die, package, pinout, and electrical specifications, AD9753ASTZ can be substituted directly for AD9753AST on an existing PCB without layout changes; only the RoHS/lead-free status differs.