Part A
AD7686BRMZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2475 PCS
- Package
- TFSOP-10
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7686CRM is a viable functional replacement candidate for the AD7686BRMZ, as both parts share the same core 16-bit SAR ADC architecture, identical pinout, and matching package footprint. Designers should validate the operating temperature range and confirm the grade-specific specifications against the target application requirements before final qualification.
Resolution and Architecture
High match
Package and Pinout
High match
Operating Temperature Range
Validation required
Grade and Specification Level
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 | AD7686BRMZ | AD7686CRM | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 16 bits | Both parts provide the same ADC resolution, so measurement granularity is identical. |
| Sampling Rate | 500 kSPS | 500 kSPS | Identical throughput means either part supports the same signal bandwidth and timing budget. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Same channel configuration allows direct functional substitution in single-channel designs. |
| Input Type | Pseudo-differential | Pseudo-differential | Matching input topology ensures the same analog front-end and reference scheme can be reused. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Same supply requirement means no power-rail redesign is needed when swapping parts. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Identical serial interface guarantees firmware and host-controller compatibility. |
| Package | 10-lead MSOP | 10-lead MSOP | Same package and footprint allow drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The wider temperature range of the CRM version matters for high-temperature or industrial environments. |
| Grade / Temperature Designator | B grade (industrial) | C grade (extended industrial) | The grade designator reflects guaranteed performance over different temperature ranges, affecting suitability for harsh environments. |
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 | AD7686BRMZ | AD7686CRM |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 500k | 500k |
| Data Interface | SPI, DSP | SPI, DSP |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 1 | - |
| Input Type | Pseudo-Differential | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Architecture | SAR | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
Frequently asked questions
What are the key differences between the AD7686BRMZ and AD7686CRM?
Both devices are 16-bit, 500 kSPS PulSAR analog-to-digital converters from Analog Devices in a 10-lead MSOP package. The primary difference is the grade: the AD7686BRMZ is specified over the −40°C to +85°C industrial temperature range, while the AD7686CRM is specified over the 0°C to +70°C commercial temperature range. The CRM grade is not a distinct datasheet part number in the current AD7686 data sheet; the B grade covers the industrial range.
Are the AD7686BRMZ and AD7686CRM pin-compatible?
Yes. Both parts use the same 10-lead MSOP (RM) package with an identical pinout: VDD, IN+, IN−, REF, GND, CNV, SDO, SCK, and VIO. The package and pin functions are the same, so PCB land patterns are interchangeable.
Do the AD7686BRMZ and AD7686CRM have the same resolution and throughput?
Yes. Both are 16-bit successive-approximation ADCs with a maximum throughput of 500 kSPS and a serial SPI-compatible interface. Resolution, sample rate, and digital interface are identical between the two grades.
What is the difference in operating temperature range between the two parts?
The AD7686BRMZ is rated for the −40°C to +85°C industrial temperature range. The AD7686CRM is rated for the 0°C to +70°C commercial temperature range. Designs exposed to sub-zero or elevated temperatures should use the B grade.
Can the AD7686CRM be used as a drop-in replacement for the AD7686BRMZ?
Electrically and mechanically they are compatible, but the CRM grade has a narrower temperature range (0°C to +70°C) than the BRMZ (−40°C to +85°C). A drop-in replacement is only acceptable if the application stays within the commercial temperature limits and all other specifications are verified against the datasheet.
Do both parts share the same reference and analog input specifications?
Yes. Both grades use the same architecture with a differential analog input range of 0 V to VREF (REF up to VDD) and the same internal conversion timing. Reference voltage range, input structure, and transfer function are common to the AD7686 family.
Which grade should be selected for industrial versus commercial applications?
For industrial, automotive-adjacent, or outdoor equipment requiring operation below 0°C or above +70°C, select the AD7686BRMZ. For benign, room-temperature commercial environments within 0°C to +70°C, the AD7686CRM grade is sufficient.