Part A
AD977ABRS
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 1992 PCS
- Package
- SSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD977ARSZRL is a functionally compatible replacement candidate for the AD977ABRS, sharing the same 16-bit SAR ADC architecture, 100 kSPS throughput, and 20-pin SSOP footprint. The primary distinction is the operating temperature grade, which requires validation against the target application's thermal requirements before substitution.
Resolution and Throughput
High match
Package Type
High match
Operating Temperature Range
Validation required
Supply Voltage and Interface
High match
Parts at a glance
Part B
AD977ARSZRL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 8106 PCS
- Package
- SSOP-28
- 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 | AD977ABRS | AD977ARSZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Bit depth determines the quantization granularity and achievable dynamic range of the ADC; both parts match here. |
| Sampling Rate | 100 kSPS | 100 kSPS | Maximum throughput defines the bandwidth of signals the converter can digitize; identical rates support the same signal bandwidth. |
| Number of Inputs / Channels | 1 single-ended | 1 single-ended | Channel count and input configuration determine system architecture and whether external multiplexing is required. |
| Interface Type | SPI / Serial (SPI-compatible) | SPI / Serial (SPI-compatible) | The digital interface must match the host controller; identical serial interfaces allow drop-in digital compatibility. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Supply requirements dictate power rail design and level compatibility with surrounding circuitry. |
| Package / Mounting | 28-lead SSOP (RS suffix) | 28-lead SSOP, tape and reel (RSZ suffix) | Package and packaging form affect PCB footprint and assembly handling; the Z suffix denotes RoHS-compliant lead finish and reel packaging. |
| RoHS Compliance | Non-RoHS (lead-containing) | RoHS compliant | RoHS status affects regulatory compliance and solder process compatibility for new designs. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range determines suitability for industrial versus commercial environments; both cover the industrial range. |
| Packaging / Ordering Format | Tube / bulk | Tape and reel (RL suffix) | Packaging format affects automated assembly line compatibility and minimum order quantities. |
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 | AD977ABRS | AD977ARSZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Obsolete | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 200k | 100k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | ADC | ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD977ABRS and AD977ARSZRL?
Both are 16-bit, 100 kSPS analog-to-digital converters from Analog Devices in the same functional family, but they differ in package and ordering grade. The AD977ABRS is supplied in a 28-lead SSOP (RS suffix) with the "B" performance grade, while the AD977ARSZRL is supplied in a 28-lead SSOP in tape-and-reel packaging (RL suffix) with the RoHS-compliant "Z" designation. The AD977ARSZRL is the RoHS-compliant, reel-packaged variant intended for automated assembly.
Are the AD977ABRS and AD977ARSZRL functionally interchangeable?
Yes, both are 16-bit, 100 kSPS successive-approximation ADCs in the AD977 family with the same pinout in the 28-lead SSOP package. However, the AD977ABRS is a non-RoHS "B" grade part, while the AD977ARSZRL is the RoHS-compliant "Z" grade in tape-and-reel. Substitution should be validated against the specific grade specifications and the assembly process requirements before use.
What is the resolution and sampling rate of these converters?
Both the AD977ABRS and AD977ARSZRL are 16-bit successive-approximation analog-to-digital converters with a maximum throughput of 100 kSPS, as specified in the Analog Devices AD977 datasheet.
What package do the AD977ABRS and AD977ARSZRL use?
Both devices are offered in a 28-lead SSOP (Shrink Small Outline Package). The "RS" in both part numbers denotes this package. The AD977ARSZRL is additionally supplied in tape-and-reel format for high-volume automated placement.
What does the "Z" suffix in AD977ARSZRL indicate?
The "Z" suffix in the AD977ARSZRL denotes RoHS compliance, meaning the part is manufactured with lead-free materials and is compliant with the Restriction of Hazardous Substances directive. The AD977ABRS does not carry this designation.
What does the "RL" suffix in AD977ARSZRL mean?
The "RL" suffix indicates tape-and-reel packaging, which is used for automated pick-and-place assembly lines. The AD977ABRS is supplied in standard tube or tray packaging rather than tape-and-reel.
What is the difference between the "B" grade and the "Z" grade in these part numbers?
The "B" in AD977ABRS refers to the performance grade of the device within the AD977 family, while the "Z" in AD977ARSZRL refers to the RoHS-compliant material designation. These are independent attributes: the "B" grade specifies performance characteristics, and the "Z" specifies environmental compliance. Designers should confirm the exact grade specifications in the Analog Devices datasheet before selecting a part.
Can the AD977ARSZRL be used as a drop-in replacement for the AD977ABRS?
Because both are 16-bit, 100 kSPS ADCs in the same 28-lead SSOP package with the same pinout, the AD977ARSZRL can generally serve as a replacement for the AD977ABRS in RoHS-compliant assemblies. However, the grade and packaging differences should be reviewed against the design's performance and manufacturing requirements, and the substitution should be validated per the manufacturer's datasheet.