Part A
AD7665ASTZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3003 PCS
- Package
- LQFP-48
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7665ASTZ and AD7665ASTRL are functionally equivalent, sharing identical core specifications including 16-bit resolution, 570 kSPS sampling rate, SAR architecture, and the same 48-lead LQFP package. The only meaningful distinction is the delivery format: the ASTZ is supplied in trays, while the ASTRL is supplied in tape-and-reel packaging. For design, layout, and electrical performance purposes, the two part numbers are interchangeable, and the choice between them should be driven solely by the assembly line's handling and packaging requirements.
Resolution and Sampling Rate
High match
Package Type
High match
Supply Voltage and Interface
High match
Packaging Format
Validation required
Parts at a glance
Part B
AD7665ASTRL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 8771 PCS
- Package
- LQFP-48
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | AD7665ASTZ | AD7665ASTRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 16 bits | Determines the quantization step and achievable dynamic range; identical resolution means equivalent measurement precision. |
| Sampling Rate | 570 kSPS | 570 kSPS | Sets the maximum throughput for the ADC; matching rates ensure the same signal bandwidth can be captured. |
| Input Type | Differential (pseudo-differential) | Differential (pseudo-differential) | Defines how the analog signal is connected; identical input topology allows drop-in signal-chain compatibility. |
| Interface | SPI / Parallel (serial and parallel) | SPI / Parallel (serial and parallel) | Determines host connectivity; matching interfaces allow the same digital bus and firmware to be reused. |
| Supply Voltage | 5 V analog (AVDD), 2.7 V to 5 V digital (DVDD) | 5 V analog (AVDD), 2.7 V to 5 V digital (DVDD) | Affects power rail design and level compatibility; identical rails permit the same power architecture. |
| Package / Case | 48-LQFP | 48-LQFP | Footprint and thermal characteristics must match for board-level interchangeability. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the environmental envelope; matching ranges ensure the same application conditions are supported. |
| Packaging / Ordering Format | Tray / Tube (bulk) | Tape and Reel | Affects manufacturing handling and pick-and-place assembly; reel vs. tray matters for automated production lines. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7665ASTZ | AD7665ASTRL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Series | PulSAR® | - |
| Sampling Rate(Per Second) | 570k | - |
| Number of Inputs | 1 | - |
| Input Type | Differential | - |
| Data Interface | SPI, Parallel, DSP | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Number of A/D Converters | 1 | - |
| Architecture | SAR | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
| Features | True Bipolar | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What is the difference between AD7665ASTZ and AD7665ASTRL?
The AD7665ASTZ and AD7665ASTRL are the same Analog Devices 16-bit, 570 kSPS PulSAR analog-to-digital converter in a 48-lead LQFP package. The difference is packaging and ordering format: AD7665ASTZ is the standard tray or tube ordering option, while AD7665ASTRL is the tape-and-reel ordering option. Both share identical electrical specifications and are specified over the -40°C to +85°C industrial temperature range.
Are AD7665ASTZ and AD7665ASTRL electrically and functionally identical?
Yes. Both part numbers refer to the same silicon die and package type (48-lead LQFP). The AD7665 is a 16-bit, 570 kSPS successive-approximation ADC with a parallel and serial interface, internal reference, and on-chip sample-and-hold. The suffix differences (Z vs RL) denote RoHS-compliant ordering and tape-and-reel packaging, not changes to electrical performance.
Can AD7665ASTRL be used as a drop-in replacement for AD7665ASTZ?
Yes, from a functional and footprint standpoint, since both are the same device in the same 48-lead LQFP package. The only practical difference is the delivery format: AD7665ASTRL is supplied on tape-and-reel for automated assembly, while AD7665ASTZ is supplied in trays or tubes. Verify the reel quantity and packaging specification against your assembly line requirements before substituting.
What are the key performance specifications of the AD7665?
The AD7665 is a 16-bit PulSAR ADC with a throughput of 570 kSPS, a parallel 16-bit interface plus a serial interface, an internal 2.5 V reference, and a unipolar or bipolar input range configuration. It operates from a 5 V analog supply with a separate digital supply, and is specified for the -40°C to +85°C industrial temperature range. Consult the official Analog Devices datasheet for full AC and DC accuracy specifications.
Does the "Z" suffix in AD7665ASTZ indicate RoHS compliance?
Yes. In Analog Devices nomenclature, the "Z" suffix denotes a RoHS-compliant, lead-free package. The AD7665ASTRL tape-and-reel option is likewise RoHS-compliant. Both parts are therefore suitable for lead-free soldering processes and RoHS-restricted applications.
Which package do AD7665ASTZ and AD7665ASTRL use?
Both parts are supplied in the 48-lead LQFP (low-profile quad flat package). The "ST" in the part number designates the LQFP package family. Because the package and pinout are identical, PCB land patterns and layout are interchangeable between the two ordering options.
Why would a design choose AD7665ASTRL over AD7665ASTZ?
AD7665ASTRL is supplied in tape-and-reel format, which is preferred for high-volume automated pick-and-place assembly lines. AD7665ASTZ in trays or tubes is typically used for prototyping, low-volume production, or manual assembly. The choice is purely a manufacturing and logistics decision, not a technical one.