Part A
ADS7951SBDBT
Texas Instruments
- Lifecycle
- Active
- Stock
- 5323 PCS
- Package
- TSSOP-30
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7952SBDBTG4 is a functional replacement candidate for the ADS7951SBDBT, sharing the same package, pinout, resolution, and supply architecture, with the primary distinction being the higher channel count of the ADS7952. Designers must validate channel-count requirements and confirm that the additional input channels do not conflict with the existing signal routing before substituting.
Resolution
High match
Package Type
High match
Channel Count
Validation required
Supply Voltage
High match
Parts at a glance
Part B
ADS7952SBDBTG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 3680 PCS
- Package
- TFSOP-38
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | ADS7952SBDBTG4 | Why it matters |
|---|---|---|---|
| Number of Input Channels | 8 | 12 | Channel count determines how many analog signals can be sampled; a 12-channel device cannot directly replace an 8-channel one if all channels are needed. |
| Resolution | 12 bit | 12 bit | Resolution sets the smallest measurable voltage step; matching resolution preserves measurement accuracy in a drop-in replacement. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum throughput must meet the system's timing requirements; identical rates allow equivalent signal bandwidth. |
| 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 to avoid level-shifting or damage; identical ranges ensure electrical compatibility. |
| Interface Type | SPI | SPI | The digital interface must match the host controller; both using SPI allows reuse of the same firmware and bus wiring. |
| Input Type | Single-ended | Single-ended | Single-ended versus differential input affects signal conditioning and noise immunity; matching types preserves the analog front-end design. |
| Package / Mounting | TSSOP-30, Surface Mount | TSSOP-30, Surface Mount | Package and footprint must match for board-level interchangeability; identical packages allow the same PCB land pattern. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Temperature range must cover the application environment; matching ranges ensure equivalent reliability under thermal stress. |
| Power Consumption (Typical) | Lower (8-channel variant) | Higher (12-channel variant) | Power budget affects thermal design and battery life; the higher-channel device draws more current, which may require supply review. |
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 | ADS7952SBDBTG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | microPOWER™ | microPOWER™ |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 8 | 12 |
| 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 ADS7952SBDBTG4?
The ADS7951SBDBT is a 12-bit, 1-MSPS, 8-channel SAR ADC, while the ADS7952SBDBTG4 is a 12-bit, 1-MSPS, 12-channel SAR ADC. Both are pin-compatible in the same 30-pin TSSOP (DBT) package and share the same SPI interface, but the ADS7952 provides four additional input channels. The "G4" suffix on the ADS7952SBDBTG4 denotes lead-free (RoHS-compliant) construction per Texas Instruments' green-material designation.
Are the ADS7951SBDBT and ADS7952SBDBTG4 pin-compatible?
Yes. Both devices are offered in the same 30-pin TSSOP (DBT) package with the same pinout, so they are footprint-compatible on a PCB. However, the ADS7952SBDBTG4 uses the additional channel pins that are not functionally used on the 8-channel ADS7951SBDBT, so the surrounding circuit must be designed to accommodate the 12-channel configuration.
What is the resolution and sampling rate of these ADCs?
Both the ADS7951SBDBT and ADS7952SBDBTG4 are 12-bit successive-approximation-register (SAR) analog-to-digital converters with a maximum throughput of 1 MSPS, as specified in the Texas Instruments ADS795x datasheet.
How many analog input channels does each device provide?
The ADS7951SBDBT provides 8 single-ended analog input channels, while the ADS7952SBDBTG4 provides 12 single-ended analog input channels. Both families also support pseudo-differential input configurations in pairs, per the TI datasheet.
What digital interface do these ADCs use?
Both devices use a SPI-compatible serial interface supporting up to 20 MHz SCLK, with a dedicated CS and a programmable alarm/output feature. The interface is compatible with the TI ADS795x family command set, allowing the same host firmware to address either device with channel-count adjustments.
What is the analog supply and reference voltage range for these parts?
Per the Texas Instruments ADS795x datasheet, both devices operate from a single analog supply (AVDD) of 2.7 V to 5.25 V, with a separate digital supply (DVDD) of 1.7 V to 5.25 V, and support an external reference voltage (VREF) range of 1.0 V to AVDD. These parameters are identical between the ADS7951SBDBT and ADS7952SBDBTG4.
Does the "G4" suffix on the ADS7952SBDBTG4 indicate a functional difference?
No. The "G4" suffix is Texas Instruments' designation for lead-free (Pb-free), RoHS-compliant green packaging. It does not change the electrical specifications or functional behavior of the ADS7952 relative to a non-G4 variant. The ADS7951SBDBT is also available in RoHS-compliant packaging; designers should confirm the specific orderable part number's material declaration.
Can the ADS7951SBDBT be replaced by the ADS7952SBDBTG4 in an existing design?
Because both share the same 30-pin TSSOP package and pinout, the ADS7952SBDBTG4 can be placed on an ADS7951SBDBT footprint. However, the replacement is only appropriate if the design can tolerate the additional channel pins and if firmware is updated to reflect the 12-channel command set. The electrical specifications (resolution, throughput, supply, reference) are equivalent, but the channel count differs, so validation against the target design is required.
What are the typical applications for these ADCs?
Both the ADS7951SBDBT and ADS7952SBDBTG4 are suited for multichannel data acquisition, industrial process control, motor control, power monitoring, and portable instrumentation, where a 12-bit, 1-MSPS SAR ADC with a SPI interface and multiple single-ended inputs is required. The ADS7952SBDBTG4 is preferred when more than 8 channels are needed in the same footprint.