Part A
AD977ABRS
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1992 ПКС
- Package
- SSOP-28
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD977ABRSZRL is a lead-free, RoHS-compliant reorder of the AD977ABRS and is functionally interchangeable in the same 28-lead SSOP footprint with identical 16-bit resolution, 100 kSPS throughput, and bipolar input range. The only meaningful distinction is package finish and environmental compliance, so the ZRL variant can be adopted directly where RoHS compliance is required, with no electrical or layout changes.
Resolution and Throughput
High match
Package and Footprint
High match
Input Configuration
High match
Environmental Compliance
Validation required
Parts at a glance
Part B
AD977ABRSZRL
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7987 ПКС
- Package
- SSOP-28
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | AD977ABRSZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Determines the quantization granularity of the ADC; both parts provide identical conversion resolution, so accuracy performance is equivalent. |
| Sampling Rate | 100 kSPS | 100 kSPS | Sets the maximum throughput of the converter; identical rates mean the same signal bandwidth can be digitized. |
| Number of Inputs / Configuration | 1 single-ended input | 1 single-ended input | Defines the analog front-end topology; matching input configuration ensures the same sensor or signal chain can be connected. |
| Interface Type | SPI / Serial (SPI-compatible) | SPI / Serial (SPI-compatible) | Determines how the converter communicates with the host controller; identical serial interface allows drop-in firmware compatibility. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Affects power rail design and level compatibility; matching supply requirements allow the same board power architecture to be reused. |
| Package / Mounting | 28-lead SSOP (RS suffix) | 28-lead SSOP (RS suffix) | Footprint and assembly compatibility; identical package means the same PCB land pattern can be used. |
| Packaging / Ordering Format | Tube / individual | Tape and reel (RL suffix) | Affects manufacturing handling and inventory; the ZRL variant is supplied on tape-and-reel for automated pick-and-place assembly, while the base part is typically tube-packed. |
| Lead-Free / RoHS Status | Not RoHS-compliant (leaded) | RoHS-compliant (lead-free, Z suffix) | Regulatory and process compatibility; the Z suffix denotes lead-free/RoHS construction, which may be mandatory for certain markets and soldering processes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the environmental envelope for reliable operation; identical ranges mean equivalent thermal robustness. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD977ABRS | AD977ABRSZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Obsolete | Last Time Buy |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 200k | 200k |
| 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 is the difference between AD977ABRS and AD977ABRSZRL?
Both are the same Analog Devices 16-bit, 100 kSPS bipolar input ADC in a 28-lead SSOP package. The AD977ABRS is supplied in tube packaging, while the AD977ABRSZRL is the RoHS-compliant version supplied in tape-and-reel packaging for automated assembly. The "Z" suffix denotes RoHS compliance, and "RL" denotes reel packaging.
Are AD977ABRS and AD977ABRSZRL electrically and functionally interchangeable?
Yes. Both parts share the same die, specifications, and pinout: 16-bit resolution, 100 kSPS throughput, bipolar ±10 V input range, and a 28-lead SSOP package. The only differences are RoHS compliance (Z suffix) and packaging format (tube vs. tape-and-reel).
Is the AD977ABRSZRL RoHS compliant while the AD977ABRS is not?
Yes. The "Z" in AD977ABRSZRL indicates the RoHS-compliant lead-free version per Analog Devices' part numbering convention. The AD977ABRS is the non-RoHS version. Designers requiring RoHS compliance for export or regulated markets should specify the AD977ABRSZRL.
What are the key performance specifications shared by both parts?
Both devices are 16-bit successive-approximation ADCs with 100 kSPS maximum throughput, ±10 V bipolar input range, ±2 LSB INL (B grade), and an SPI-compatible serial interface. They operate from a +5 V analog supply and a +5 V digital supply, and are specified over the industrial temperature range.
Can AD977ABRS and AD977ABRSZRL be used interchangeably on the same PCB?
Yes. Both use the identical 28-lead SSOP package with the same pinout and footprint, so no PCB layout change is required. The choice between them depends only on RoHS requirements and assembly method (manual/tube vs. automated reel placement).
Why would a design choose the tape-and-reel AD977ABRSZRL over the tube-packaged AD977ABRS?
The AD977ABRSZRL tape-and-reel format is suited for high-volume automated pick-and-place assembly and provides RoHS compliance. The AD977ABRS tube format is typically used for prototyping, low-volume runs, or manual assembly where RoHS is not required.
Do both parts require the same external reference and support circuitry?
Yes. Both share identical analog and digital interfaces, so the same external reference, decoupling, and layout recommendations from the AD977 datasheet apply to either part. No circuit changes are needed when switching between them.