Part A
ADS7961QDBTRQ1
Texas Instruments
- Lifecycle
- Active
- Stock
- 1800 PCS
- Package
- TSSOP-38
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7951SBDBT and ADS7961QDBTRQ1 share the same 12-bit SAR ADC architecture, 1 MSPS throughput, and single 2.7 V to 5.25 V supply, making them functionally aligned for many precision acquisition designs. However, the ADS7961QDBTRQ1 offers 16 input channels versus 8 on the ADS7951SBDBT and is AEC-Q100 qualified for automotive use, so the substitution is viable only after confirming channel count, package footprint, and qualification requirements in the target application.
Resolution and Sample Rate
High match
Supply Voltage Range
High match
Channel Count
Validation required
Package and Qualification
Validation required
Parts at a glance
Part B
ADS7951SBDBT
Texas Instruments
- Lifecycle
- Active
- Stock
- 5323 PCS
- Package
- TSSOP-30
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADS7951SBDBT | ADS7961QDBTRQ1 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 8 bit | Resolution determines the smallest measurable analog step; a 12-bit ADC provides 16x finer quantization than an 8-bit ADC, directly affecting measurement accuracy and dynamic range. |
| Number of Input Channels | 8 single-ended | 16 single-ended | Channel count defines how many analog signals can be multiplexed into a single ADC; the 16-channel device supports twice as many sensor inputs without external multiplexing. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum throughput determines how fast signals can be digitized; both parts share the same 1 MSPS rate, so timing-critical designs behave similarly. |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Analog supply range sets the input signal span and compatibility with system rails; identical ranges allow the same front-end biasing and reference design. |
| Interface | SPI (serial) | SPI (serial) | The digital interface must match the host controller; both use SPI, so firmware and bus wiring are largely interchangeable. |
| Package | TSSOP-30 | TSSOP-30 | Package footprint and pinout affect PCB layout and assembly; matching packages simplify board rework and drop-in substitution. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Temperature range determines suitability for automotive and industrial environments; identical ratings mean equivalent environmental robustness. |
| Qualification | Industrial | AEC-Q100 (automotive) | Automotive qualification implies stricter reliability and quality screening; the Q1 part is required for automotive applications while the industrial part is not. |
| Input Type | Single-ended | Single-ended | Input configuration determines how signals are referenced; both single-ended parts interface identically to ground-referenced sensors. |
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 | ADS7961QDBTRQ1 | ADS7951SBDBT |
|---|---|---|
| Series | Automotive, AEC-Q100 | microPOWER™ |
| Part Status | Active | Active |
| Number of Bits | 8 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 16 | 8 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Voltage - Supply, Digital | 1.7V ~ 5.25V | 1.7V ~ 5.25V |
| Features | PGA | - |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the ADS7951SBDBT and the ADS7961QDBTRQ1?
The ADS7951SBDBT is a 12-bit, 1-MSPS, 8-channel SAR ADC in a 30-pin TSSOP package, specified over the industrial temperature range of -40°C to +125°C. The ADS7961QDBTRQ1 is a 12-bit, 1-MSPS, 16-channel SAR ADC in a 38-pin TSSOP package that is AEC-Q100 qualified for automotive applications. The primary differences are channel count (8 vs. 16), package pin count (30 vs. 38), and qualification grade (industrial vs. automotive AEC-Q100).
Are the ADS7951SBDBT and ADS7961QDBTRQ1 pin-to-pin compatible?
No. The ADS7951SBDBT uses a 30-pin TSSOP (DBT) package, while the ADS7961QDBTRQ1 uses a 38-pin TSSOP (DBT) package. The different pin counts and correspondingly different pin functions and PCB land patterns mean they are not drop-in replacements for one another.
Do both devices share the same resolution and sampling rate?
Yes. Both the ADS7951SBDBT and ADS7961QDBTRQ1 are 12-bit successive-approximation register (SAR) ADCs with a maximum throughput of 1 MSPS, per the respective Texas Instruments datasheets.
What is the difference in input channel count between the two parts?
The ADS7951SBDBT provides 8 analog input channels, while the ADS7961QDBTRQ1 provides 16 analog input channels. Both devices support single-ended inputs with a programmable input range, but the ADS7961QDBTRQ1 offers twice the channel count for higher-density multiplexing applications.
Is the ADS7961QDBTRQ1 automotive qualified, and is the ADS7951SBDBT?
The ADS7961QDBTRQ1 carries the Q1 designation and is AEC-Q100 qualified for automotive use, per Texas Instruments documentation. The ADS7951SBDBT is an industrial-grade device and is not AEC-Q100 qualified. Designs requiring automotive qualification should use the Q1 variant.
Do both devices use the same serial interface?
Yes. Both the ADS7951SBDBT and ADS7961QDBTRQ1 use an SPI-compatible serial interface for configuration and data readback, allowing connection to common host controllers and DSPs. The command set and frame structure are defined in the respective datasheets and should be reviewed for channel-count-dependent differences.
Can the ADS7951SBDBT be substituted with the ADS7961QDBTRQ1 in an existing design?
Not as a direct drop-in. Although both are 12-bit, 1-MSPS SAR ADCs with SPI interfaces, the 16-channel ADS7961QDBTRQ1 requires a 38-pin footprint versus the 30-pin footprint of the 8-channel ADS7951SBDBT, and the channel addressing in software differs. Any substitution requires a PCB redesign and firmware validation against the target datasheet.