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 ADS7866IDBVR and ADS7887MDBVT are both 12-bit, single-channel SAR analog-to-digital converters with a serial interface, making them functionally comparable for many low-power signal acquisition designs. However, they differ in package footprint and sampling throughput, so the ADS7887MDBVT should be treated as a functional candidate rather than a direct drop-in replacement until board layout and timing margins are validated.
Resolution
High match
Output Interface
High match
Package Type
Validation required
Sampling Rate
Validation required
Parts at a glance
Part B
ADS7887MDBVT
Texas Instruments
- Lifecycle
- Active
- Stock
- 9951 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 | ADS7866IDBVR | ADS7887MDBVT | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 10 bit | Resolution determines the smallest analog signal change the ADC can distinguish; a 12-bit part offers 4x finer quantization than a 10-bit part, affecting measurement accuracy and dynamic range. |
| Sampling Rate | 200 kSPS | 1.25 MSPS | Maximum throughput limits the bandwidth of signals that can be digitized; the faster part supports higher-frequency inputs and faster system update rates. |
| Number of Input Channels | 1 single-ended | 1 single-ended | Channel count and configuration determine how many signals can be measured and whether differential or single-ended sensors can be interfaced directly. |
| Supply Voltage Range | 1.6 V to 3.6 V | 2.35 V to 5.25 V | The supply range dictates compatibility with the system rail; the wider/higher-voltage part can operate from 5 V systems while the lower-voltage part suits 1.8 V/3.3 V logic supplies. |
| Interface Type | SPI (serial) | SPI (serial) | The digital interface must match the host controller; both use SPI, so bus compatibility is preserved, though timing and word length differ with resolution. |
| Package / Mounting | SOT-23-6 (SMD) | SOT-23-6 (SMD) | Package and footprint determine board layout compatibility; identical SOT-23-6 packages allow a drop-in footprint swap without PCB redesign. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The temperature range defines the environments where the part is guaranteed to meet specifications; the wider-range part suits harsher industrial/automotive conditions. |
| Input Type | Single-ended, unipolar | Single-ended, unipolar | Input configuration determines signal conditioning needs; both accept unipolar single-ended inputs, so sensor front-end topology remains compatible. |
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 | ADS7887MDBVT |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | microPOWER™ | microPOWER™ |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 10 |
| Sampling Rate(Per Second) | 200k | 1.25M |
| 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 | 2.35V ~ 5.25V |
| Voltage - Supply, Digital | 1.2V ~ 3.6V | 2.35V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -55°C ~ 125°C |
Frequently asked questions
What are the key differences between the ADS7866IDBVR and ADS7887MDBVT?
The ADS7866IDBVR is a 12-bit, 200-kSPS micropower SAR ADC in a SOT-23-6 (DBV) package, while the ADS7887MDBVT is a 10-bit, 1.25-MSPS SAR ADC in a SOT-23-6 (DBV) package. The ADS7866 offers higher resolution at a lower sample rate, whereas the ADS7887 provides a higher sampling rate at reduced resolution.
Are the ADS7866IDBVR and ADS7887MDBVT pin-compatible?
Both devices are offered in the same 6-pin SOT-23 (DBV) package, and their pin functions (VDD, GND, CS, SCLK, SDO, and analog input) are functionally aligned per the respective Texas Instruments datasheets. However, designers should verify the exact pin configuration and timing requirements against each datasheet before substituting one for the other on an existing PCB.
What are the resolution and sampling rate specifications of each device?
The ADS7866IDBVR provides 12-bit resolution with a maximum throughput of 200 kSPS. The ADS7887MDBVT provides 10-bit resolution with a maximum throughput of 1.25 MSPS. These figures are specified in the respective Texas Instruments datasheets.
How do the supply voltage and power consumption compare?
Both devices operate from a single 2.35 V to 5.25 V supply. The ADS7866 is characterized as a micropower ADC with very low power consumption at low sample rates, while the ADS7887 draws proportionally more current to support its higher 1.25-MSPS throughput. Exact quiescent and active current figures should be taken from the electrical characteristics tables in each datasheet.
What serial interface do these ADCs use?
Both the ADS7866IDBVR and ADS7887MDBVT use a SPI-compatible serial interface with CS, SCLK, and SDO signals, allowing direct connection to most microcontrollers and DSPs. The interface timing, including SCLK frequency limits and acquisition timing, differs between the two devices and must be checked against the respective datasheets.
Can the ADS7887MDBVT directly replace the ADS7866IDBVR in an existing design?
Direct replacement is not recommended without validation. Although both share the same SOT-23-6 package and serial interface, the ADS7887 has 10-bit resolution versus 12-bit on the ADS7866 and a higher maximum sample rate. System firmware, timing, and accuracy budgets must be re-evaluated against the ADS7887 datasheet before substitution.
What are the typical applications for each ADC?
The ADS7866IDBVR is suited to low-power, portable, and battery-operated systems requiring 12-bit accuracy at modest sample rates, such as sensor signal conditioning and handheld instrumentation. The ADS7887MDBVT is suited to applications needing faster sampling, such as motor control, power monitoring, and data acquisition where 10-bit resolution is sufficient.