Part A
ADS7951SBDBT
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 5323 PCS
- Package
- TSSOP-30
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7951SBDBT and ADS7961SDBTRG4 are both 12-bit, 1-MSPS SAR ADCs with an SPI interface in a 38-pin TSSOP package, making them strong functional replacement candidates. The primary distinction is channel count: the ADS7951SBDBT provides 8 single-ended inputs, while the ADS7961SDBTRG4 provides 16 single-ended inputs. Designers must confirm that the target application's channel requirements and board layout accommodate this difference before substituting one for the other.
Resolution
High match
Package Type
High match
Interface Type
High match
Channel Count
Validation required
Parts at a glance
Part B
ADS7961SDBTRG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 7627 PCS
- Package
- TFSOP-38
- 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 | ADS7951SBDBT | ADS7961SDBTRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 12 | 8 | Resolution determines the smallest analog voltage change the ADC can distinguish; a 12-bit device provides 16x finer quantization than an 8-bit device, directly affecting measurement accuracy. |
| Number of Input Channels | 8 | 16 | Channel count defines how many analog signals can be multiplexed into a single ADC; the 16-channel part supports twice as many sensor inputs without adding external multiplexers. |
| Sampling Rate (max) | 1 MSPS | 1 MSPS | Maximum throughput determines how fast the system can digitize signals; both parts share the same 1 MSPS rate, so timing budgets remain compatible. |
| Supply Voltage (analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Analog supply range must match the system rail; identical ranges mean the same power supply design can be reused for either part. |
| Interface Type | SPI (serial) | SPI (serial) | The digital interface must be compatible with the host controller; both use SPI, so firmware and bus wiring are interchangeable. |
| Package | TSSOP-30 | TSSOP-30 | Package footprint and pinout determine PCB layout compatibility; identical TSSOP-30 packages allow a drop-in board replacement. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Temperature range must cover the application environment; matching industrial ranges ensure equivalent reliability in harsh conditions. |
| Input Type | Single-ended | Single-ended | Single-ended inputs reference each channel to ground; matching input topology means the same sensor wiring and signal conditioning can be used. |
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 | ADS7951SBDBT | ADS7961SDBTRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | microPOWER™ | microPOWER™ |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 12 | 8 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 8 | 16 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-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 |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the ADS7951SBDBT and ADS7961SDBTRG4?
The ADS7951SBDBT is a 12-bit, 8-channel, 1-MSPS SAR ADC with a SPI interface, supplied in a 30-pin TSSOP (DBT) package. The ADS7961SDBTRG4 is a 12-bit, 16-channel, 1-MSPS SAR ADC in a 38-pin TSSOP (DBT) package, supplied in tape-and-reel (RG4) form. The primary differences are channel count (8 vs 16) and package pin count (30 vs 38).
Are the ADS7951SBDBT and ADS7961SDBTRG4 pin-compatible?
No. The ADS7951SBDBT uses a 30-pin TSSOP package, while the ADS7961SDBTRG4 uses a 38-pin TSSOP package. The different pin counts and pinouts prevent direct PCB footprint compatibility.
Do both devices share the same resolution and sampling rate?
Yes. Both the ADS7951SBDBT and ADS7961SDBTRG4 are 12-bit successive-approximation register (SAR) ADCs with a maximum throughput of 1 MSPS, per the Texas Instruments ADS795x/ADS796x datasheet family specifications.
What is the difference in input channel count between the two parts?
The ADS7951SBDBT provides 8 analog input channels, whereas the ADS7961SDBTRG4 provides 16 analog input channels. Both support single-ended inputs configurable through the serial interface command set.
Do both ADCs use the same serial interface?
Yes. Both devices use a SPI-compatible serial interface for configuration and data readout, supporting daisy-chain operation and programmable channel sequencing as documented in the ADS795x/ADS796x family datasheet.
What is the significance of the RG4 suffix on the ADS7961SDBTRG4?
The RG4 suffix denotes tape-and-reel packaging in the Texas Instruments ordering nomenclature. The base device is the ADS7961 in a 38-pin TSSOP (DBT) package; the RG4 variant is supplied on reel for automated assembly.
Can the ADS7951SBDBT be used as a drop-in replacement for the ADS7961SDBTRG4?
No. Because the two devices differ in package pin count (30 vs 38 pins) and channel count (8 vs 16), a direct drop-in replacement is not possible. Any substitution requires PCB redesign and validation against the target design requirements.