Part A
AD7789BRMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4316 個数
- Package
- TFSOP-10
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7789BRMZ and AD7789BRM are functionally equivalent low-power 24-bit sigma-delta ADCs from Analog Devices, sharing the same core architecture, resolution, and interface. The primary distinction is the package finish: the BRMZ suffix denotes a RoHS-compliant lead-free molding compound, while the BRM variant is the non-RoHS legacy version. For designs requiring environmental compliance, the AD7789BRMZ is the preferred drop-in candidate, provided PCB assembly processes are qualified for lead-free reflow.
Resolution and ADC Architecture
High match
Package Type and Pinout
High match
RoHS Compliance
Not compatible
Operating Temperature Range
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 | AD7789BRMZ | AD7789BRM | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | 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 measured; matching channel configuration ensures functional interchangeability. |
| Interface Type | SPI / Microwire (3-wire serial) | SPI / Microwire (3-wire serial) | The digital communication protocol must match the host controller for the part to be a drop-in replacement. |
| 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; identical range allows use in the same circuit without redesign. |
| Package / Mounting | 10-Lead MSOP (RoHS-compliant) | 10-Lead MSOP | Footprint and pinout must match for board-level substitution; the Z suffix denotes RoHS compliance while the base part is non-RoHS. |
| RoHS Compliance | Yes (Pb-free / RoHS compliant) | No (contains lead) | RoHS status affects regulatory compliance and solder process compatibility; the Z-suffix part is required for lead-free manufacturing. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Determines the environments in which the device can reliably operate; matching ranges ensure equivalent application coverage. |
| Manufacturer | Analog Devices | Analog Devices | Same manufacturer and product family confirms identical silicon design and datasheet specifications. |
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 | AD7789BRMZ | AD7789BRM |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 19 |
| 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 AD7789BRMZ and the AD7789BRM?
The AD7789BRMZ and AD7789BRM are functionally identical 24-bit sigma-delta ADCs from Analog Devices. The only difference is the package/ordering suffix: the "Z" suffix in AD7789BRMZ denotes RoHS-compliant lead-free construction (Pb-free), while the AD7789BRM is the non-RoHS (leaded) version. Both are supplied in a 10-lead MSOP package and share the same electrical specifications.
Are the AD7789BRMZ and AD7789BRM electrically and functionally interchangeable?
Yes. Both parts share the same die, pinout, and datasheet specifications, including 24-bit resolution, a single differential input channel, and an SPI-compatible serial interface. The only distinction is the RoHS/lead-free status of the package finish, so they are functionally interchangeable in a design, subject to the assembly's RoHS compliance requirements.
What are the key specifications of the AD7789?
The AD7789 is a low-power, 24-bit sigma-delta ADC with one differential input channel, an on-chip PGA, and an SPI-compatible serial interface. It operates from a single 2.7 V to 5.25 V supply and is specified for low-power, low-noise measurement applications. Refer to the official Analog Devices datasheet for exact noise, gain, and power figures.
What package do the AD7789BRMZ and AD7789BRM use?
Both devices are offered in a 10-lead MSOP (Mini Small Outline Package). The "RM" code in the part number designates the MSOP package, and the "Z" suffix indicates the RoHS-compliant lead-free version.
Does the "Z" suffix affect the electrical performance of the AD7789?
No. The "Z" suffix only indicates RoHS compliance (lead-free package finish). It does not change the electrical specifications, resolution, accuracy, or interface of the device. Electrical performance is identical between the AD7789BRMZ and AD7789BRM.
Which part should be selected for a RoHS-compliant design?
For RoHS-compliant assemblies, the AD7789BRMZ should be selected because its "Z" suffix denotes lead-free, RoHS-compliant construction. The AD7789BRM is the non-RoHS version and should only be used where leaded finish is acceptable or required.
Can the AD7789BRMZ and AD7789BRM be used in the same PCB footprint?
Yes. Both parts are packaged in the same 10-lead MSOP with identical pinout and land pattern, so they share the same PCB footprint. Substitution between them does not require layout changes, only consideration of RoHS compliance requirements.