Part A
AD7928BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5202 PCS
- Package
- TSSOP-20
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7923SRU-EP can serve as a functional substitute for the AD7928BRUZ in many designs, since both are 12-bit successive-approximation ADCs in a 20-lead TSSOP package with a serial interface. However, the AD7928BRUZ provides eight input channels versus four on the AD7923SRU-EP, and the two parts differ in throughput rate and temperature grade, so the substitution should be validated against the specific channel count, sampling rate, and environmental requirements of the target application.
Channel Count
Validation required
Sampling Rate
Validation required
Package Type
High match
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 | AD7928BRUZ | AD7923SRU-EP | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 8 | 4 | Channel count determines how many analog signals can be sampled; an 8-channel part cannot be directly substituted where 4 channels suffice, but a 4-channel part cannot cover 8-channel needs. |
| Resolution | 12 bits | 12 bits | Resolution sets the smallest detectable signal step; matching 12-bit resolution preserves measurement precision in substitution. |
| Maximum Throughput Rate | 1 MSPS | 200 kSPS | Sampling speed limits the highest signal frequency that can be captured; the slower part may not meet timing requirements of a faster system. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Compatible supply range allows the part to operate in the same power rail configuration without level shifting. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Matching serial interface ensures the replacement can communicate with the existing host controller without protocol changes. |
| Input Type | Single-ended | Single-ended | Input configuration must match the sensor or signal source topology for correct conversion. |
| Package / Mounting | 20-TSSOP (surface mount) | 16-TSSOP (surface mount) | Different package pin counts and footprints affect PCB layout compatibility and may require board redesign. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The extended temperature range of the EP part supports harsher environments, which may be required or over-specified for a given application. |
| Power Consumption (typical) | 6 mW at 1 MSPS (5 V) | 3.5 mW at 200 kSPS (5 V) | Power draw affects thermal budget and battery life; the lower-power part may be preferable in energy-sensitive designs. |
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 | AD7928BRUZ | AD7923SRU-EP |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1M | 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 AD7928BRUZ and AD7923SRU-EP?
The AD7928BRUZ is an 8-channel, 12-bit successive-approximation ADC with a serial interface, specified for the 0°C to +70°C commercial temperature range in a 20-lead TSSOP package. The AD7923SRU-EP is a 4-channel, 12-bit SAR ADC in a 16-lead TSSOP package, offered as an enhanced product (EP) with an extended -55°C to +125°C operating temperature range and controlled manufacturing baseline for aerospace and defense applications. The primary differences are channel count (8 vs 4), package pin count (20 vs 16), and specified temperature range.
Are the AD7928BRUZ and AD7923SRU-EP pin-compatible?
No. The AD7928BRUZ uses a 20-lead TSSOP package, while the AD7923SRU-EP uses a 16-lead TSSOP package. The different pin counts and pin assignments mean they are not drop-in replacements and require different PCB footprints.
Do both parts share the same resolution and interface type?
Yes. Both are 12-bit successive-approximation ADCs with a serial (SPI/QSPI/MICROWIRE/DSP-compatible) interface, so resolution and digital communication protocol are common to both devices.
What is the difference in input channel count between the two devices?
The AD7928BRUZ provides 8 analog input channels, while the AD7923SRU-EP provides 4 analog input channels. Designs requiring more single-ended or multiplexed inputs should account for this difference.
Why would the AD7923SRU-EP be preferred over the AD7928BRUZ in some applications?
The AD7923SRU-EP is an enhanced product with an extended -55°C to +125°C temperature range and a controlled manufacturing baseline, making it suitable for harsh-environment, aerospace, and defense applications. The AD7928BRUZ is specified for the 0°C to +70°C commercial range, which is adequate for standard commercial and industrial designs.
Can the AD7923SRU-EP directly replace the AD7928BRUZ in an existing design?
No, not without redesign. The two devices differ in package (16-lead vs 20-lead TSSOP), channel count (4 vs 8), and specified temperature range. A direct substitution would require verifying footprint, channel requirements, and thermal specifications against the target design.
Are both devices available in TSSOP packages?
Yes. Both the AD7928BRUZ and AD7923SRU-EP are offered in TSSOP packages, though with different lead counts: 20-lead TSSOP for the AD7928BRUZ and 16-lead TSSOP for the AD7923SRU-EP.