Part A
AD9850BRS
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3838 PCS
- Package
- SSOP-28
- Series
- Interface - Direct Digital Synthesis (DDS)
Replacement verdict
Compatible functional replacement candidate
The AD9850BRSZ is a RoHS-compliant, lead-free version of the AD9850BRS and is form, fit, and function compatible, making it a suitable drop-in replacement in existing 28-lead SSOP designs where lead-free compliance is required.
Package Type
High match
Function and Resolution
High match
Supply Voltage and Interface
High match
RoHS Compliance
Validation required
Parts at a glance
Part B
AD9850BRSZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4393 PCS
- Package
- SSOP-28
- Series
- Interface - Direct Digital Synthesis (DDS)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9850BRSZ | AD9850BRS | Why it matters |
|---|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | Same manufacturer ensures consistent design, documentation, and support. |
| Function | CMOS Direct Digital Synthesizer (DDS) | CMOS Direct Digital Synthesizer (DDS) | Identical core function confirms the parts are functionally interchangeable in DDS applications. |
| Package / Case | 28-Lead SSOP | 28-Lead SSOP | Same package footprint allows drop-in replacement on an existing PCB. |
| Supply Voltage | 3.3 V to 5.0 V | 3.3 V to 5.0 V | Matching supply range ensures compatibility with the same power rail design. |
| Maximum Clock Frequency | 125 MHz | 125 MHz | Same maximum clock supports identical output frequency generation capability. |
| Resolution (DAC Bits) | 10-bit DAC | 10-bit DAC | Equal DAC resolution yields comparable spectral purity and output quality. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same temperature range ensures equivalent environmental robustness. |
| RoHS / Lead Status | RoHS compliant, lead-free | Non-RoHS, contains lead | The "Z" suffix denotes lead-free/RoHS compliance, which affects regulatory compliance and solder process requirements. |
| Part Number Suffix Meaning | Z = RoHS-compliant, lead-free | No Z = standard leaded version | The suffix difference is the primary distinction and determines environmental compliance and assembly compatibility. |
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 | AD9850BRS | AD9850BRSZ |
|---|---|---|
| Part Status | Active | Active |
| Resolution(Bits) | 10 b | 10 b |
| Masterfclk | 125 MHz | 125 MHz |
| Tuning Word Width(Bits) | 32 b | 32 b |
| Voltage - Supply | 3.3V, 5V | 3.3V, 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the AD9850BRSZ and the AD9850BRS?
The AD9850BRSZ is the RoHS-compliant, lead-free (Pb-free) version of the AD9850BRS. Both are functionally identical direct digital synthesizer (DDS) ICs in a 28-lead SSOP package, but the AD9850BRSZ is specified for lead-free reflow soldering and meets RoHS environmental requirements, while the AD9850BRS is the older leaded (Pb) version.
Are the AD9850BRSZ and AD9850BRS electrically and functionally interchangeable?
Yes. Both devices share the same die, core specifications, and pinout: 125 MHz maximum clock, 32-bit frequency tuning word, 10-bit DAC, and 28-lead SSOP package. The only documented difference is the package finish/lead material (Pb-free vs. leaded), so they are functionally interchangeable in circuit design.
Can the AD9850BRSZ be used as a drop-in replacement for the AD9850BRS on an existing PCB?
Electrically and functionally, yes, since the pinout and package footprint are identical. However, the AD9850BRSZ requires a lead-free soldering profile with higher peak reflow temperatures, so the assembly process must be validated for Pb-free reflow before substituting it in a production line originally set up for the leaded AD9850BRS.
What are the key performance specifications shared by the AD9850BRSZ and AD9850BRS?
Both devices are CMOS DDS synthesizers with a 125 MHz maximum clock frequency, 32-bit frequency tuning word, on-chip 10-bit DAC, and a wideband SFDR of approximately 50 dBc at 40 MHz output. They operate from a 3.3 V or 5 V supply and are specified over the industrial temperature range of -40°C to +85°C.
Which version should be selected for a new RoHS-compliant design?
The AD9850BRSZ should be selected for new designs requiring RoHS compliance and lead-free assembly. The AD9850BRS (leaded) is generally not recommended for new designs where environmental compliance is mandated, though it may still be available for legacy or non-RoHS applications.
Do the AD9850BRSZ and AD9850BRS differ in package or pin configuration?
No. Both are supplied in the same 28-lead SSOP (Shrink Small Outline Package) with identical pin assignments, including the parallel/serial control interface, DAC output, comparator input, and clock input pins. The package outline and PCB land pattern are the same for both versions.
Are the AD9850BRSZ and AD9850BRS both still available from authorized distributors?
Availability varies by distributor and date code. The AD9850BRSZ is the currently recommended orderable part number, while the AD9850BRS (leaded) may be listed as obsolete or non-recommended for new designs. Designers should verify current stock and lifecycle status directly with authorized distributors such as DigiKey, Mouser, or the manufacturer before committing to a part number.