Part A
AD7718BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5458 PCS
- Package
- TSSOP-28
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7718BRUZ and AD7718BRU are functionally equivalent signal-conditioning ADCs sharing the same core architecture, channel count, resolution, and interface, with the BRUZ suffix denoting a RoHS-compliant package variant of the same device. The primary distinction is package finish and environmental compliance rather than electrical performance, making the BRUZ a suitable functional replacement candidate for the BRU where lead-free/RoHS compliance is required, subject to final validation of the specific assembly and qualification requirements.
Resolution and Channel Count
High match
Package Type and Footprint
High match
Supply Voltage and Interface
High match
RoHS and Lead-Free Compliance
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 | AD7718BRUZ | AD7718BRU | Why it matters |
|---|---|---|---|
| Resolution | 24-bit | 24-bit | Determines the finest signal increment the ADC can resolve; identical resolution means equivalent measurement precision. |
| Number of Input Channels | 8 differential / 10 single-ended | 8 differential / 10 single-ended | Defines how many sensor or signal sources can be connected; matching channel count preserves system I/O capability. |
| Package / Case | 28-TSSOP | 28-TSSOP | Footprint and pinout must match for a drop-in board replacement; identical package ensures physical compatibility. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Must be compatible with the system power rail; matching range allows use in the same circuit without redesign. |
| Interface Type | SPI / 3-wire serial | SPI / 3-wire serial | The digital communication protocol must match the host controller; identical interface ensures firmware compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Determines environmental suitability; matching range ensures the part works in the same application conditions. |
| RoHS / Lead-Free Status | RoHS compliant, lead-free | Non-RoHS, contains lead | Affects regulatory compliance and solder process; the Z suffix denotes lead-free, which may be mandatory for new designs. |
| Part Number Suffix Meaning | Z = RoHS-compliant package | No Z = standard (leaded) package | The suffix distinguishes environmental compliance variants; functionally equivalent but differ in materials compliance. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7718BRUZ | AD7718BRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 1.37k | 1.37k |
| Number of Inputs | 4/5, 8/10 | 4/5, 8/10 |
| Input Type | Differential, Pseudo-Differential | Differential, Pseudo-Differential |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | MUX-PGA-ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What is the difference between the AD7718BRUZ and the AD7718BRU?
The AD7718BRUZ and AD7718BRU are functionally identical signal conditioning ADCs from Analog Devices. The difference is the suffix: the "Z" designation indicates RoHS-compliant, lead-free (Pb-free) packaging and construction, while the AD7718BRU is the non-RoHS, lead-containing version. Both are 24-bit sigma-delta ADCs with an on-chip PGA, offered in a 28-lead TSSOP package.
Are the AD7718BRUZ and AD7718BRU pin-compatible?
Yes. Both devices are specified in the same 28-lead TSSOP (RU) package with identical pin assignments and the same functional block diagram. The "Z" suffix denotes RoHS compliance only and does not change the package outline or pinout, so they are pin-for-pin compatible.
Can the AD7718BRUZ be used as a drop-in replacement for the AD7718BRU?
Electrically and functionally, yes, provided the design does not require leaded (non-RoHS) construction. The AD7718BRUZ is the RoHS-compliant equivalent of the AD7718BRU with the same ADC architecture, resolution, and package. Designs should still verify solderability and process compatibility for the lead-free finish against their manufacturing requirements.
What are the key specifications common to both the AD7718BRUZ and AD7718BRU?
Both are 24-bit sigma-delta ADCs with an on-chip programmable gain amplifier (PGA), operating from a single 3 V or 5 V supply (with a separate 2.7 V to 5.25 V digital supply). They provide multiple analog input channels configurable as single-ended or differential, an on-chip programmable filter, and a serial SPI-compatible interface, in a 28-lead TSSOP package.
Does the "Z" suffix affect the electrical performance of the AD7718?
No. The "Z" suffix in the AD7718BRUZ designates RoHS/lead-free compliance and does not alter the electrical specifications. The ADC resolution, gain range, supply requirements, and interface timing are the same as the AD7718BRU; only the package finish and material compliance differ.
Which version should be selected for a new RoHS-compliant design?
The AD7718BRUZ should be selected for new designs requiring RoHS compliance, as it is the lead-free, RoHS-compliant variant. The AD7718BRU is the non-RoHS version and is generally not appropriate for new designs subject to RoHS or lead-free manufacturing requirements.
Are the AD7718BRUZ and AD7718BRU available in the same package type?
Yes. Both are offered in the 28-lead TSSOP package (Analog Devices package code RU). The package body, lead count, and pinout are the same; the difference is the lead finish and RoHS compliance status indicated by the "Z" suffix.