Part A
AD977ABRS
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1992 PCS
- Package
- SSOP-28
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD977ABRS and AD977ARSRL are functionally equivalent 16-bit successive-approximation ADCs sharing the same core architecture, resolution, and input configuration, making them a viable replacement candidate. The primary distinction lies in their package and ordering format, so design verification should focus on mechanical fit and assembly process compatibility before substitution.
Resolution and Architecture
High match
Input Configuration
High match
Package Type
Validation required
Ordering Format
Validation required
Parts at a glance
Part B
AD977ARSRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6877 PCS
- Package
- SSOP-28
- Series
- Data Acquisition - Analog to Digital Converters (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 | AD977ARSRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both parts share the same 16-bit resolution, so conversion accuracy class is equivalent. |
| Sampling Rate | 100 kSPS | 100 kSPS | Identical throughput means either part meets the same system timing requirements. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Same single-channel architecture allows direct functional substitution in the signal chain. |
| Interface Type | Serial (SPI/QSPI compatible) | Serial (SPI/QSPI compatible) | Matching serial interface ensures the same host controller and firmware can drive either device. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Same supply requirements mean no power-rail redesign is needed when swapping parts. |
| Package / Mounting | 28-lead SSOP (RS suffix) | 28-lead SSOP (RS suffix), tape and reel | Both use the same SSOP footprint; the RL suffix only denotes tape-and-reel packaging, so board layout is unchanged. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range supports use in the same environmental conditions. |
| Packaging / Ordering Format | Tube / tray (bulk) | Tape and reel (RL) | The only meaningful difference is delivery format; tape-and-reel suits automated assembly while tube suits prototyping. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD977ABRS | AD977ARSRL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 200k | 100k |
| Data Interface | SPI | SPI |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 1 | - |
| Input Type | Single Ended | - |
| Configuration | ADC | - |
| Architecture | SAR | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
Frequently asked questions
What are the key differences between the AD977ABRS and AD977ARSRL?
Both are 16-bit, 100 kSPS analog-to-digital converters from Analog Devices in a 28-lead SSOP package. The AD977ABRS is specified for the industrial temperature range of −40°C to +85°C, while the AD977ARSRL is specified for the automotive temperature range of −40°C to +125°C. The "RL" suffix on AD977ARSRL indicates tape-and-reel packaging, whereas AD977ABRS is supplied in tube packaging.
Are the AD977ABRS and AD977ARSRL functionally interchangeable?
Yes. Both devices share the same 16-bit SAR ADC core, the same 100 kSPS maximum throughput, the same 28-lead SSOP pinout, and the same serial and parallel interface options. The primary differences are the rated operating temperature range and the shipping package format, so functional interchangeability is possible when the application's thermal environment is within the narrower industrial range.
What is the resolution and maximum sampling rate of these converters?
Both the AD977ABRS and AD977ARSRL are 16-bit successive-approximation ADCs with a maximum throughput of 100 kSPS. They provide no missing codes to 16 bits and are specified for a full-scale input range of ±10 V with an internal 2.5 V reference.
What interfaces do the AD977ABRS and AD977ARSRL support?
Both parts offer a flexible parallel interface for 16-bit or 8-bit bus connections and a serial interface for daisy-chained or isolated configurations. The interface mode is selected via dedicated control pins, allowing the same device to be used in either parallel or serial system architectures.
What package and pin configuration do these devices use?
Both the AD977ABRS and AD977ARSRL are housed in a 28-lead SSOP (shrink small outline package). The pinout is identical between the two orderable part numbers, so PCB land patterns and footprint designs are shared.
How do the operating temperature ranges of the two parts differ?
The AD977ABRS is rated for the industrial temperature range of −40°C to +85°C. The AD977ARSRL is rated for the automotive temperature range of −40°C to +125°C. Designs that must operate above +85°C should use the AD977ARSRL, provided all other specifications are met over that extended range.
What does the "RL" suffix on the AD977ARSRL indicate?
The "RL" suffix denotes tape-and-reel packaging, which is intended for automated pick-and-place assembly lines. The AD977ABRS is supplied in standard tube packaging. The electrical performance and die are the same; only the shipping format and temperature grade differ.
What are the power supply requirements for the AD977ABRS and AD977ARSRL?
Both devices operate from a single +5 V analog supply and a separate +5 V digital supply, with typical power dissipation of approximately 100 mW at 100 kSPS. The internal 2.5 V reference is used to derive the ±10 V full-scale input range, and the analog and digital supplies should be decoupled as recommended in the datasheet.