Part A
AD9751ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3339 Stückzahl
- Package
- LQFP-48
- Series
- Data Acquisition von Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9751ASTZ and AD9751ASTZRL are functionally identical, differing only in packaging format (tube vs. tape and reel). Both share the same 10-bit, 300 MSPS TxDAC architecture, 48-lead LQFP package, and industrial temperature range, making them fully interchangeable for design and production purposes. The tape-and-reel variant is recommended for automated SMT assembly lines, while the tube version suits prototyping and low-volume runs.
Resolution and Sample Rate
High match
Package Type
High match
Operating Temperature Range
High match
Packaging Format
High match
Parts at a glance
Part B
AD9751ASTZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2412 Stückzahl
- Series
- Data Acquisition von Digital to Analog Converters (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 | AD9751ASTZ | AD9751ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 10 bit | 10 bit | Determines the quantization accuracy and dynamic range of the DAC output; identical resolution means equivalent signal fidelity. |
| Number of D/A Converters | 1 | 1 | Confirms both parts provide a single DAC channel, so channel count is not a differentiator for substitutability. |
| Sampling Rate (Max) | 300 Msps | 300 Msps | Sets the maximum update rate for high-speed signal synthesis; matching rates ensure equivalent bandwidth capability. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Defines the interface to downstream circuitry; identical output type means the same external buffer/termination design applies. |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Must match the system power rail; identical ranges confirm the parts are interchangeable in the same supply domain. |
| Package / Case | 48-LQFP | 48-LQFP | Footprint and thermal characteristics must match for drop-in replacement on an existing PCB. |
| Mounting Type | Surface Mount | Surface Mount | Assembly method must be compatible with the production process; identical mounting ensures no rework is needed. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Determines suitability for the target environment; matching ranges confirm equivalent thermal robustness. |
| Packaging | Tray | Tape & Reel (RL) | Affects handling and automated assembly; the RL suffix denotes reel packaging, which matters for high-volume pick-and-place production but not electrical function. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9751ASTZ | AD9751ASTZRL |
|---|---|---|
| Series | TxDAC+® | TxDAC+® |
| Part Status | Active | Active |
| Digi Key Programmable | - | Not Verified |
| Number of Bits | 10 | 10 |
| Number of D / A Converters | - | 1 |
| Settling Time | 11ns (Typ) | 11ns (Typ) |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | Parallel |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 3V ~ 3.6V | 3V ~ 3.6V |
| Voltage - Supply, Digital | 3V ~ 3.6V | 3V ~ 3.6V |
| INL / DNL (LSB) | - | ±0.3, ±0.2 |
| Architecture | Current Source | Current Source |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
| Base Product Number | - | AD9751 |
| Number of D/A Converters | 1 | - |
| INL / DNL(LSB) | ±0.3, ±0.2 | - |
Frequently asked questions
What is the difference between AD9751ASTZ and AD9751ASTZRL?
Both are the same AD9751 10-bit, 300 MSPS high-speed DAC in a 48-lead LQFP package. The suffix difference is packaging form: AD9751ASTZ is the standard tray/individual packaging order code, while AD9751ASTZRL denotes tape-and-reel packaging (RL suffix) for automated assembly. Electrical specifications and die are identical.
Are AD9751ASTZ and AD9751ASTZRL electrically and functionally interchangeable?
Yes. Both order codes refer to the identical AD9751 device (10-bit, 300 MSPS TxDAC+ with on-chip 1.2 V reference, 48-lead LQFP). The only difference is the shipping container (tray vs. tape-and-reel), so they are interchangeable in the target design.
What are the key performance specifications of the AD9751?
The AD9751 is a 10-bit current-output DAC with a maximum update rate of 300 MSPS, an on-chip 1.2 V bandgap reference, differential current outputs (typically 2 mA to 20 mA full-scale), and a 48-lead LQFP package. It operates from a 3.0 V to 3.6 V analog supply and 2.7 V to 3.6 V digital supply. Verify exact AC linearity (SFDR, IMD) figures against the Analog Devices datasheet for your conditions.
Which package do AD9751ASTZ and AD9751ASTZRL use, and is it RoHS compliant?
Both use the 48-lead LQFP (7 mm x 7 mm body) package. The "Z" in the order code denotes the RoHS-compliant, lead-free (Pb-free) version per Analog Devices ordering nomenclature. Confirm current compliance status on the manufacturer or authorized distributor page before final qualification.
Why would a designer choose the RL (tape-and-reel) version over the tray version?
The AD9751ASTZRL tape-and-reel format is intended for high-volume automated pick-and-place SMT assembly lines, providing consistent component orientation and feeding. The tray version (AD9751ASTZ) is typically used for prototyping, low-volume runs, or manual assembly. The choice is purely a manufacturing/logistics decision, not a performance one.
What are the typical applications for the AD9751?
The AD9751 is used in high-speed signal synthesis applications such as broadband communication transmitters, direct digital synthesis (DDS), arbitrary waveform generation, and instrumentation. Its 300 MSPS update rate and 10-bit resolution suit wideband baseband and IF transmit chains. Confirm suitability against your specific spectral mask and linearity requirements.
What supply voltages and reference options does the AD9751 support?
The device operates with an analog supply of 3.0 V to 3.6 V and a digital supply of 2.7 V to 3.6 V. It includes an internal 1.2 V reference, and the full-scale output current can be set via an external resistor or by using the internal reference. Consult the Analog Devices datasheet for exact reference and compliance-voltage limits.
Can AD9751ASTZ and AD9751ASTZRL be mixed on the same PCB assembly?
Yes. Since both order codes are the same die and package, they can be used interchangeably on the same PCB. However, mixing tray and reel formats on one SMT line may require different feeder setups; from an electrical and footprint standpoint there is no restriction.