Part A
AD7621ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6501 PCS
- Package
- LQFP-48
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7621ASTZ and AD7621ASTZRL are functionally identical, differing only in packaging format (tube vs. tape and reel). Both share the same 16-bit SAR ADC architecture, 3 MSPS sampling rate, LQFP-48 package, and industrial temperature range, making them fully interchangeable for design and production purposes. The tape-and-reel variant is recommended for automated assembly lines, while the tube variant suits prototyping and low-volume runs.
Resolution and Sampling Rate
High match
Package Type
High match
Operating Temperature Range
High match
Packaging Format
High match
Parts at a glance
Part B
AD7621ASTZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7199 PCS
- Package
- LQFP-48
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7621ASTZ | AD7621ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Determines the number of discrete levels the ADC can resolve; identical resolution means equivalent measurement precision. |
| Sampling Rate | 3 MSPS | 3 MSPS | Sets the maximum conversion throughput; matching rates ensure the parts are interchangeable for the same signal bandwidth requirements. |
| Number of Inputs / Channels | 1 differential | 1 differential | Defines the input configuration; identical single differential input allows direct substitution in the same signal chain. |
| Input Type | Differential | Differential | Affects noise immunity and interface circuitry; matching differential inputs preserve board-level compatibility. |
| Data Interface | SPI, Parallel | SPI, Parallel | Determines how the ADC connects to the host processor; identical interfaces allow the same digital wiring and firmware. |
| Supply Voltage | 5 V (analog), 2.5 V (digital) | 5 V (analog), 2.5 V (digital) | Must match the system power rails; identical supply requirements mean no power design changes are needed. |
| Package / Case | 48-LQFP | 48-LQFP | Footprint and pinout must match for drop-in replacement; identical LQFP packaging ensures PCB compatibility. |
| Mounting Type | Surface Mount | Surface Mount | Assembly method must be compatible with the production process; both being surface mount ensures the same reflow assembly. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Defines the environmental envelope; identical ranges ensure both parts suit the same application conditions. |
| Packaging / Ordering Format | Tray | Tape & Reel | Affects manufacturing handling and pick-and-place automation; the RL suffix denotes reel packaging, which matters for high-volume automated assembly but not electrical function. |
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 | AD7621ASTZ | AD7621ASTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 3M | 3M |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | SPI, Parallel, DSP | SPI, Parallel, DSP |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 2.37V ~ 2.63V | 2.37V ~ 2.63V |
| Voltage - Supply, Digital | 2.37V ~ 2.63V | 2.37V ~ 2.63V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What is the difference between AD7621ASTZ and AD7621ASTZRL?
The AD7621ASTZ and AD7621ASTZRL are the same Analog Devices 16-bit, 3 MSPS PulSAR analog-to-digital converter in a 48-lead LQFP package. The suffix "RL" denotes tape-and-reel packaging, while the base part number AD7621ASTZ is typically supplied in tray packaging. Electrical performance and functional specifications are identical.
Are AD7621ASTZ and AD7621ASTZRL electrically and functionally interchangeable?
Yes. Both order codes refer to the same silicon device, the AD7621, with identical 16-bit resolution, 3 MSPS maximum throughput, SAR architecture, and 48-lead LQFP pinout. The only difference is the shipping packaging format (tray versus tape-and-reel), so they are interchangeable in the target design.
What are the key performance specifications of the AD7621?
The AD7621 is a 16-bit, 3 MSPS successive-approximation ADC with a pseudo-differential input, an internal 2.5 V reference, and a 2.5 V to 5 V logic interface. It offers typical SNR of approximately 90 dB and typical INL of ±1 LSB, and operates from a 5 V analog supply with a separate VIO supply for digital interfacing.
What package and pin configuration do AD7621ASTZ and AD7621ASTZRL use?
Both parts are supplied in the 48-lead LQFP (STZ suffix) package with the same pin assignments. Because the package, footprint, and pinout are identical, PCB layout and land patterns are the same for both order codes.
Why would a design choose the AD7621ASTZRL instead of the AD7621ASTZ?
The AD7621ASTZRL is supplied on tape-and-reel, which is preferred for automated high-volume SMT assembly lines. The AD7621ASTZ in trays is typically used for prototyping, low-volume runs, or manual assembly. Selection is based on manufacturing packaging requirements, not electrical differences.
Do AD7621ASTZ and AD7621ASTZRL share the same operating temperature range and interface?
Yes. Both order codes specify the same industrial temperature range and the same parallel/serial digital interface options, including a flexible parallel interface and a serial interface, since they are the same device. Packaging format does not affect temperature grade or interface capability.
Can AD7621ASTZ and AD7621ASTZRL be mixed on the same production line?
Yes. Because both are the same AD7621 die in the same 48-lead LQFP package with identical pinout and specifications, they can be used interchangeably on the same assembly line. The choice between tray and tape-and-reel only affects the feeding method of the pick-and-place equipment.