Part A
AD977ABRZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4556 PCS
- Package
- SOIC-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD977ABRZ and AD977BR are functionally compatible 16-bit ADCs sharing the same resolution, architecture, and package family, making the AD977ABRZ a viable replacement candidate for the AD977BR. Designers should confirm the tighter grade specifications and verify supply and timing margins against the target application before final qualification.
Resolution and Architecture
High match
Package Type
High match
Grade and Accuracy Specifications
Validation required
Supply and Timing Parameters
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD977ABRZ | AD977BR | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both converters provide 16-bit resolution, so nominal accuracy and dynamic range are equivalent. |
| Sampling Rate | 100 kSPS | 100 kSPS | Identical maximum throughput means either part can meet the same acquisition timing requirements. |
| Input Type | Single-ended | Single-ended | Both accept single-ended analog inputs, so the same front-end signal conditioning can be used. |
| Interface | Serial (SPI/QSPI compatible) | Serial (SPI/QSPI compatible) | Matching serial interfaces allow drop-in replacement without changing the digital host connection. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Same supply requirements mean the existing power design supports either device. |
| Package / Mounting | 28-lead SOIC (R-28), surface mount | 28-lead SOIC (R-28), surface mount | Identical package and footprint enable physical interchangeability on the same PCB. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range ensures equivalent environmental qualification. |
| INL (Integral Nonlinearity) | ±2.0 LSB max | ±2.0 LSB max | Equal linearity specifications indicate comparable static accuracy for precision measurement applications. |
| Power Consumption | 100 mW typ | 100 mW typ | Matching power draw keeps thermal and supply budgeting unchanged when substituting parts. |
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 | AD977ABRZ | AD977BR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| 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 AD977ABRZ and the AD977BR?
The AD977ABRZ is the RoHS-compliant, lead-free (Pb-free) version of the AD977A 16-bit ADC, supplied in a 28-lead SOIC_W package. The AD977BR is the non-RoHS (tin-lead) version of the standard AD977 16-bit ADC in the same 28-lead SOIC package. The primary differences are the grade (AD977A vs. AD977) and the package finish/RoHS compliance.
Do the AD977ABRZ and AD977BR have the same pinout and package?
Yes. Both devices are offered in a 28-lead SOIC (0.295" wide) package with an identical pin configuration, so they are footprint-compatible. The difference is the package finish: the AD977ABRZ is Pb-free/RoHS-compliant, while the AD977BR uses a standard tin-lead finish.
What are the resolution and sampling rate specifications for these ADCs?
Both the AD977A (AD977ABRZ) and the AD977 (AD977BR) are 16-bit successive-approximation ADCs with a maximum throughput of 200 kSPS. They share the same core architecture and conversion rate.
How do the AD977ABRZ and AD977BR differ in linearity and accuracy grades?
The AD977A (AD977ABRZ) is specified with tighter grades than the standard AD977 (AD977BR). The AD977A offers ±2.0 LSB max INL and ±1.0 LSB max DNL (B grade), while the AD977 standard version is specified at ±3.0 LSB max INL and ±1.0 LSB max DNL. Designers should confirm the exact grade suffix against the manufacturer datasheet for the target design.
Are the AD977ABRZ and AD977BR interchangeable in an existing design?
Because they share the same package, pinout, resolution, and 200 kSPS throughput, they are functionally interchangeable in many designs. However, the AD977ABRZ is the higher-grade, RoHS-compliant part, so substitution should be validated against the accuracy requirements and the assembly's lead-free/RoHS process requirements.
What is the analog input configuration of these ADCs?
Both devices provide a true bipolar analog input range of ±10 V and support both serial and parallel (byte/word) digital output interfaces. They operate from a +5 V analog supply with a separate +5 V digital supply.
Which part should be selected for a RoHS-compliant production build?
The AD977ABRZ should be selected for RoHS-compliant, lead-free assembly because it is the Pb-free version. The AD977BR uses a tin-lead finish and is not RoHS-compliant, so it is generally unsuitable for RoHS-restricted production unless a documented exemption applies.