Part A
AD7997BRUZ-0
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3591 PCS
- Package
- TSSOP-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7997BRUZ-0 and AD7997BRU-0 are functionally equivalent 8-channel, 10-bit I2C ADCs from Analog Devices; the only documented distinction is the RoHS-compliant lead finish of the BRUZ-0 versus the non-RoHS BRU-0, so the BRUZ-0 is a suitable drop-in replacement where lead-free compliance is required.
Resolution and Channel Count
High match
Package Type
High match
Supply Voltage Range
High match
RoHS Compliance
Validation required
Parts at a glance
Part B
AD7997BRU-0
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9641 PCS
- Package
- TSSOP-20
- Series
- Data Acquisition - Analog to Digital Converters (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 | AD7997BRUZ-0 | AD7997BRU-0 | Why it matters |
|---|---|---|---|
| Resolution | 10 bit | 10 bit | Determines the smallest analog voltage change the ADC can resolve; must match for equivalent measurement precision. |
| Number of Input Channels | 8 single-ended / 4 pseudo-differential | 8 single-ended / 4 pseudo-differential | Defines how many analog signals can be monitored; a functional substitute must support the same channel count and configuration. |
| Sampling Rate | 188 kSPS | 188 kSPS | Sets the maximum conversion throughput; identical rates ensure the same signal bandwidth can be captured. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Must be compatible with the system power rail; matching ranges allow direct drop-in use. |
| Interface Type | I2C (2-wire serial) | I2C (2-wire serial) | The digital communication protocol must match the host controller for the part to be functionally interchangeable. |
| Package / Mounting | 16-TSSOP (surface mount) | 16-TSSOP (surface mount) | Footprint and mounting style must match for board-level compatibility. |
| RoHS / Lead-Free Status | RoHS compliant, lead-free | Non-RoHS, contains lead | Affects regulatory compliance and solder process; the "Z" suffix denotes the lead-free variant, which matters for environmental and manufacturing requirements. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Ensures the device operates reliably across the intended environmental conditions. |
| Reference Type | External reference | External reference | Determines the ADC full-scale range and accuracy; matching reference architecture ensures equivalent measurement behavior. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7997BRUZ-0 | AD7997BRU-0 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 10 | 10 |
| Sampling Rate(Per Second) | 188k | 188k |
| Number of Inputs | 8 | 8 |
| Input Type | Single Ended | Single Ended |
| Data Interface | I²C | I²C |
| 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 ~ 5.5V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What is the difference between the AD7997BRUZ-0 and the AD7997BRU-0?
The primary difference is the package and ordering suffix. The AD7997BRUZ-0 is supplied in a 20-lead TSSOP (RU-20) with a lead-free, RoHS-compliant finish, indicated by the "Z" suffix. The AD7997BRU-0 is the non-RoHS version of the same 20-lead TSSOP device. Both are functionally identical 8-channel, 10-bit ADCs with an I2C-compatible interface.
Are the AD7997BRUZ-0 and AD7997BRU-0 functionally interchangeable?
Yes. Both parts share the same die, resolution (10-bit), channel count (8 single-ended / 4 pseudo-differential inputs), I2C-compatible serial interface, and 20-lead TSSOP footprint. The only documented difference is the RoHS/lead-free status of the package finish, so they are functionally interchangeable in designs that do not have a RoHS restriction.
What is the resolution and channel count of the AD7997?
The AD7997 is a 10-bit successive-approximation ADC with 8 single-ended analog input channels, configurable as 4 pseudo-differential input pairs. It communicates over an I2C-compatible 2-wire serial interface.
What is the difference between the "-0" and "-1" grade options for the AD7997?
The "-0" and "-1" suffixes denote the I2C address variant. The AD7997-0 and AD7997-1 use different fixed I2C slave address configurations, allowing two devices to coexist on the same bus. The AD7997BRUZ-0 and AD7997BRU-0 are both the "-0" address variant.
What supply voltage range does the AD7997 support?
The AD7997 operates from a single 2.7 V to 5.5 V supply, with a separate VDRIVE pin for the digital interface that allows the I2C bus to operate at a different logic level from the analog supply.
Does the "Z" suffix affect electrical performance or specifications?
No. The "Z" suffix in AD7997BRUZ-0 indicates a lead-free, RoHS-compliant package finish. It does not change the electrical specifications, resolution, accuracy, timing, or functional behavior of the device compared with the non-Z AD7997BRU-0.
Can the AD7997BRUZ-0 be used as a drop-in replacement for the AD7997BRU-0?
Yes, from a footprint and functional standpoint the two parts are drop-in compatible because both use the same 20-lead TSSOP package and pinout. The AD7997BRUZ-0 additionally meets RoHS requirements, so it is generally the preferred choice for new designs and for markets with lead-free mandates.