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 AD7927BRU are functionally equivalent 12-bit, 8-channel successive-approximation ADCs sharing the same core architecture, resolution, channel count, and serial interface. The only material distinction is the package finish: the AD7927BRUZ is the RoHS-compliant, lead-free (Pb-free) version of the AD7927BRU. For designs requiring RoHS compliance, the AD7927BRUZ is the preferred drop-in choice; for legacy non-RoHS assemblies, the AD7927BRU remains valid. Both parts are interchangeable at the functional level, with package finish being the sole differentiator.
Resolution and Architecture
High match
Channel Count and Input Type
High match
Package and Pinout
High match
RoHS and Lead-Free Compliance
Validation required
Parts at a glance
Part B
AD7927BRU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8421 PCS
- Package
- TSSOP-20
- 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 | AD7927BRU | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Determines the smallest analog signal change the ADC can resolve; identical resolution means equivalent measurement granularity. |
| Number of Channels | 8 (single-ended) | 8 (single-ended) | Defines how many analog inputs can be sampled; matching channel count ensures the same system-level input capacity. |
| Sampling Rate | 200 kSPS | 200 kSPS | Sets the maximum conversion throughput; identical rates preserve timing and bandwidth performance in the application. |
| Supply Voltage (Analog and Digital) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Determines compatibility with the system power rails; matching ranges allow direct substitution without supply redesign. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Defines how the ADC communicates with the host controller; identical interfaces ensure firmware and bus compatibility. |
| Package / Mounting | 20-TSSOP (RU-20), surface mount | 20-TSSOP (RU-20), surface mount | Affects PCB footprint and assembly; identical package and mounting allow drop-in board replacement. |
| RoHS / Lead-Free Status | RoHS compliant, lead-free (Z suffix) | Non-RoHS, contains lead (no Z suffix) | The "Z" suffix denotes lead-free/RoHS compliance; this is the key difference affecting regulatory compliance and solder process requirements. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the environmental envelope for reliable operation; matching ranges ensure equivalent thermal performance. |
| Input Type | Single-ended, unipolar | Single-ended, unipolar | Determines signal conditioning requirements; identical input configuration allows the same front-end circuitry to be reused. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7927BRUZ | AD7927BRU |
|---|---|---|
| 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 | 8 |
| 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 ~ 85°C |
Frequently asked questions
What is the difference between the AD7927BRUZ and the AD7927BRU?
The AD7927BRUZ and AD7927BRU are functionally identical 8-channel, 12-bit successive-approximation ADCs from Analog Devices. The only difference is the package/ordering suffix: the "Z" suffix on AD7927BRUZ denotes RoHS-compliant lead-free construction, while AD7927BRU is the non-RoHS (leaded) version. Both are supplied in a 20-lead TSSOP package.
Are the AD7927BRUZ and AD7927BRU electrically and functionally interchangeable?
Yes. Both parts share the same datasheet specifications: 12-bit resolution, up to 200 kSPS throughput, 8 analog input channels, single 2.7 V to 5.25 V supply, and a serial SPI/QSPI/MICROWIRE/DSP-compatible interface. The electrical performance and pinout are identical; the distinction is solely the RoHS compliance of the package finish.
Do the AD7927BRUZ and AD7927BRU use the same package and pinout?
Yes. Both devices are offered in a 20-lead TSSOP (RU suffix) with an identical pin configuration, so the PCB land pattern and pin functions are the same for both variants.
Which variant should be selected for RoHS-compliant or lead-free assembly?
The AD7927BRUZ should be selected for RoHS-compliant, lead-free manufacturing. The AD7927BRU is the non-RoHS version and is not intended for lead-free processes requiring RoHS compliance.
What are the key performance specifications shared by both the AD7927BRUZ and AD7927BRU?
Both are 12-bit SAR ADCs with 8 single-ended input channels, up to 200 kSPS conversion rate, a 2.7 V to 5.25 V single supply, and a serial interface compatible with SPI, QSPI, MICROWIRE, and DSP systems. They also feature a sequencer for channel scanning and are specified over the industrial temperature range.
Can the AD7927BRUZ be used as a drop-in replacement for the AD7927BRU in an existing design?
Yes, from an electrical and footprint standpoint the AD7927BRUZ is a drop-in replacement for the AD7927BRU because both share the same 20-lead TSSOP pinout and identical specifications. The substitution only changes the RoHS status of the part, so designs requiring RoHS compliance should use the AD7927BRUZ.
What supply voltage and interface do the AD7927BRUZ and AD7927BRU require?
Both devices operate from a single supply of 2.7 V to 5.25 V and communicate over a serial interface compatible with SPI, QSPI, MICROWIRE, and DSP host controllers, making them suitable for a range of industrial and instrumentation applications.