Part A
ADS7866IDBVR
Texas Instruments
- Lifecycle
- Active
- Stock
- 1287 PCS
- Package
- SOT-23-6
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7868IDBVR and ADS7866IDBVR are functionally compatible 12-bit and 8-bit micro-power SAR ADCs respectively, sharing the same SOT-23-6 package, pinout, and single-supply architecture, making them viable candidates for design substitution where ADC resolution requirements permit. The primary differentiator is resolution, which must be validated against system accuracy requirements before adoption.
Resolution
Validation required
Package Type
High match
Supply Voltage Range
High match
Interface Type
High match
Parts at a glance
Part B
ADS7868IDBVR
Texas Instruments
- Lifecycle
- Active
- Stock
- 5174 PCS
- Package
- SOT-23-6
- 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 | ADS7868IDBVR | ADS7866IDBVR | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both converters provide the same 12-bit resolution, so measurement precision is equivalent. |
| Number of Input Channels | 1 single-ended | 1 single-ended | Identical channel configuration means the same signal routing can be used for either part. |
| Sampling Rate | 200 kSPS | 200 kSPS | Equal throughput allows the same acquisition timing and firmware to be reused. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching supply ranges ensure both parts operate in the same system power domain. |
| Interface Type | SPI (serial) | SPI (serial) | Same serial interface means no change to the host controller communication protocol. |
| Package | SOT-23-6 | SOT-23-6 | Identical package footprint allows drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same temperature rating means both parts suit the same environmental conditions. |
| Input Type | Single-ended | Single-ended | Matching input topology ensures the same analog front-end design applies to both. |
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 | ADS7866IDBVR | ADS7868IDBVR |
|---|---|---|
| Series | microPOWER™ | microPOWER™ |
| Part Status | Active | Active |
| Number of Bits | 12 | 8 |
| Sampling Rate(Per Second) | 200k | 280k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | Supply |
| Voltage - Supply, Analog | 1.2V ~ 3.6V | 1.2V ~ 3.6V |
| Voltage - Supply, Digital | 1.2V ~ 3.6V | 1.2V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS7868IDBVR and ADS7866IDBVR?
The ADS7868IDBVR is a 12-bit, 1-MSPS micropower SAR ADC, while the ADS7866IDBVR is an 8-bit, 1.2-MSPS micropower SAR ADC. Both are single-channel, unipolar devices in a SOT-23-6 (DBV) package with a pseudo-differential input, but they differ in resolution and maximum throughput rate.
Are the ADS7868IDBVR and ADS7866IDBVR pin-compatible?
Yes. Both devices are offered in the same 6-pin SOT-23 (DBV) package and share the same pinout (VDD, GND, IN+, IN-, SCLK, and SDO/CS functions), so they are pin-compatible and can share a common PCB footprint.
What is the resolution and sampling rate of each device?
The ADS7868IDBVR provides 12-bit resolution at a maximum throughput of 1 MSPS. The ADS7866IDBVR provides 8-bit resolution at a maximum throughput of 1.2 MSPS.
Do both parts use the same serial interface?
Yes. Both devices use a SPI-compatible serial interface with a separate serial clock (SCLK) and chip-select/frame signal, allowing them to be clocked at rates up to the specified maximum SCLK frequency in their respective datasheets.
What is the supply voltage range for the ADS7868IDBVR and ADS7866IDBVR?
Both devices operate from a single analog supply in the 2.7 V to 5.25 V range, making them suitable for low-power, mixed-signal systems that require a wide supply window.
Can the ADS7866IDBVR be used as a drop-in replacement for the ADS7868IDBVR?
Only if the system can tolerate a reduction in resolution from 12 bits to 8 bits. Because the pinout and package are identical, the ADS7866IDBVR can be placed on the same footprint, but the digital output code width and effective resolution will change, so the design's accuracy requirements must be revalidated.
Which device is better suited for higher-accuracy measurements?
The ADS7868IDBVR is better suited for higher-accuracy measurements because it provides 12-bit resolution, whereas the ADS7866IDBVR provides 8-bit resolution. For a given input range, the 12-bit device offers finer quantization steps and lower quantization error.