Part A
AD7788ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3173 PCS
- Package
- MSOP-10
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7788ARMZ and AD7788ARM are functionally equivalent low-power 24-bit sigma-delta ADCs from Analog Devices, sharing the same core architecture, resolution, and interface. The AD7788ARMZ is the RoHS-compliant lead-free package variant of the AD7788ARM, making it a suitable drop-in replacement in most applications where lead-free compliance is required or preferred.
Resolution and Architecture
High match
Package Type
High match
Interface Type
High match
RoHS 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 | AD7788ARMZ | AD7788ARM | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Determines the smallest signal change the ADC can resolve; identical resolution means equivalent measurement precision. |
| Number of Input Channels | 1 (differential) | 1 (differential) | Defines how many signal sources can be connected; matching channel count ensures the same system topology can be used. |
| Sampling Rate | 16.7 SPS | 16.7 SPS | Sets the maximum update rate for conversions; identical rates preserve timing behavior in the application. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Must match the system power rail; identical ranges allow direct substitution without power redesign. |
| Interface Type | SPI (3-wire serial) | SPI (3-wire serial) | Determines compatibility with the host microcontroller; matching interface ensures firmware and wiring remain unchanged. |
| Package / Mounting | 10-Lead MSOP (Surface Mount) | 10-Lead MSOP (Surface Mount) | Footprint and assembly compatibility; identical package allows drop-in replacement on the same PCB. |
| Packaging / Ordering Suffix | Z (RoHS-compliant, tube/tray) | Non-Z (legacy, may be non-RoHS) | The Z suffix denotes lead-free/RoHS compliance; this affects regulatory compliance and solder process requirements. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines environmental limits for reliable operation; matching ranges ensure equivalent thermal performance. |
| Input Type | Differential, sigma-delta | Differential, sigma-delta | Architecture affects noise performance and filtering; identical architecture preserves signal-chain characteristics. |
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 | AD7788ARMZ | AD7788ARM |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 16.6 | 16.6 |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | ADC | ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.5V ~ 5.25V | 2.5V ~ 5.25V |
| Voltage - Supply, Digital | 2.5V ~ 5.25V | 2.5V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What is the difference between the AD7788ARMZ and the AD7788ARM?
The AD7788ARMZ is the RoHS-compliant, lead-free (Pb-free) version of the AD7788ARM. Both are 16-bit sigma-delta ADCs from Analog Devices in an 8-lead MSOP package and are functionally identical; the suffix "Z" denotes the RoHS-compliant packaging option.
Are the AD7788ARMZ and AD7788ARM functionally interchangeable?
Yes. Both parts share the same 16-bit sigma-delta ADC core, the same 8-lead MSOP pinout, and the same specified performance. The only documented difference is the RoHS/lead-free construction indicated by the "Z" suffix on the AD7788ARMZ.
What is the resolution and architecture of these ADCs?
Both the AD7788ARMZ and AD7788ARM are 16-bit sigma-delta (Σ-Δ) analog-to-digital converters, providing high resolution for low-frequency, low-power measurement applications.
What package do the AD7788ARMZ and AD7788ARM use?
Both devices are supplied in an 8-lead MSOP (Mini Small Outline Package), so the PCB land pattern and footprint are identical between the two orderable part numbers.
Does the "Z" suffix affect electrical performance?
No. The "Z" suffix on the AD7788ARMZ designates RoHS compliance and lead-free termination finish; it does not change the specified electrical parameters or functional behavior relative to the AD7788ARM.
Which part should be selected for a RoHS-compliant design?
The AD7788ARMZ should be selected for RoHS-compliant and lead-free assembly requirements, since its "Z" suffix denotes RoHS compliance. The AD7788ARM is the non-RoHS legacy orderable variant.
Can the AD7788ARMZ directly replace the AD7788ARM on an existing PCB?
Yes, from a footprint and functional standpoint, since both are 8-lead MSOP devices with identical pinout and function. Any substitution should still be validated against the manufacturer datasheet and the target design's compliance requirements.