Part A
AD7927BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2549 PCS
- Package
- TSSOP-20
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7927BRUZ and AD7923SRU-EP share a compatible 12-bit SAR architecture, 16-lead TSSOP footprint, and 2.7 V to 5.25 V supply range, making the AD7923SRU-EP a viable functional substitute for the AD7927BRUZ in many designs. However, the AD7923SRU-EP offers only 4 single-ended input channels versus 8 on the AD7927BRUZ, and its enhanced product (EP) grade is specified over a narrower temperature range, so channel count and thermal margin must be validated against the target application before substitution.
Resolution and Architecture
High match
Package and Pinout
High match
Input Channel Count
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
AD7923SRU-EP
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7540 PCS
- Package
- TSSOP-16
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | AD7927BRUZ | AD7923SRU-EP | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so conversion resolution is equivalent for substitutability. |
| Number of Input Channels | 8 channels (single-ended) | 4 channels (single-ended) | Channel count determines how many analog signals can be multiplexed into one ADC; the AD7927 supports twice as many inputs. |
| Sampling Rate | 200 kSPS | 200 kSPS | Maximum throughput is identical, so timing and bandwidth requirements are met by either part. |
| Supply Voltage (Analog and Digital) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Both operate over the same supply range, allowing use in the same 3 V or 5 V systems. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Identical serial interface compatibility means the same host controller and firmware can drive either device. |
| Package | 20-lead TSSOP | 16-lead TSSOP | Different package footprints and pin counts affect PCB layout and may require board redesign when substituting. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The enhanced-process AD7923SRU-EP supports a wider temperature range, making it suitable for harsher environments. |
| Input Type | Single-ended | Single-ended | Both accept single-ended inputs, so signal conditioning topology remains the same. |
| Power Consumption (Typical) | Approximately 3.5 mW at 3 V, 200 kSPS | Approximately 3.5 mW at 3 V, 200 kSPS | Similar power draw means thermal and power budget considerations are comparable between the two 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 | AD7927BRUZ | AD7923SRU-EP |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 200k |
| Number of Inputs | 8 | 4 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | MUX-S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the AD7927BRUZ and AD7923SRU-EP?
The AD7927BRUZ is an 8-channel, 12-bit successive-approximation ADC with a serial interface, specified for operation from −40°C to +85°C in a 20-lead TSSOP. The AD7923SRU-EP is a 4-channel, 12-bit SAR ADC in a 16-lead TSSOP, offered as an enhanced product with an extended temperature range of −55°C to +125°C and controlled manufacturing baseline for aerospace/defense applications. The primary differences are channel count (8 vs 4), package pin count (20 vs 16), and the qualified temperature range.
Are the AD7927BRUZ and AD7923SRU-EP pin-compatible?
No. The AD7927BRUZ uses a 20-lead TSSOP package, while the AD7923SRU-EP uses a 16-lead TSSOP package. The different pin counts and pinouts mean they are not drop-in replacements and require different PCB footprints.
What is the resolution and throughput of these ADCs?
Both devices are 12-bit successive-approximation ADCs. The AD7927BRUZ offers throughput up to 200 kSPS. The AD7923SRU-EP offers throughput up to 200 kSPS as well. Both feature a serial SPI-compatible interface for connection to microcontrollers and DSPs.
What input voltage range do the AD7927BRUZ and AD7923SRU-EP support?
Both devices operate from a single 2.7 V to 5.25 V supply and accept analog input signals from 0 V to VREF, where VREF is the external reference voltage applied to the REF IN pin. The input range is unipolar and set by the reference, allowing flexible full-scale configuration.
What is the significance of the "EP" suffix on the AD7923SRU-EP?
The "EP" designates an Enhanced Product. Enhanced Products are manufactured and tested to an extended temperature range (−55°C to +125°C) and are supported by a controlled manufacturing baseline with change notification, making them suitable for harsh-environment and defense/aerospace applications. The standard AD7927BRUZ is specified over the industrial range of −40°C to +85°C.
Can the AD7923SRU-EP be used as a replacement for the AD7927BRUZ in an existing design?
Not directly. Although both are 12-bit SAR ADCs with similar serial interfaces, the AD7923SRU-EP has 4 channels versus 8 channels on the AD7927BRUZ, and it uses a 16-lead TSSOP versus a 20-lead TSSOP. A redesign of the PCB layout and firmware channel sequencing would be required, and the reduced channel count must be acceptable for the application.
Which device is better suited for extended-temperature or defense applications?
The AD7923SRU-EP is the appropriate choice for extended-temperature and defense/aerospace applications because it is an Enhanced Product rated for −55°C to +125°C with a controlled manufacturing baseline. The AD7927BRUZ is specified only over the industrial temperature range of −40°C to +85°C and is not qualified for the same harsh-environment use.
Do both parts support the same serial interface protocol?
Yes. Both the AD7927BRUZ and AD7923SRU-EP use an SPI-compatible serial interface for configuration and data readback, allowing connection to most microcontrollers and DSPs. However, because the channel counts differ, the command and channel-sequencing details in firmware must be adapted to the specific device.