Part A
ADS7953SBDBTR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6896 PCS
- Package
- TSSOP-38
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7951SDBTG4 is a functional replacement candidate for the ADS7953SBDBTR only when the reduced channel count is acceptable; the ADS7953SBDBTR provides 16 single-ended channels while the ADS7951SDBTG4 provides 8, so designs requiring the full channel count must retain the original part. Both devices share the same TSSOP-38 package, 12-bit SAR architecture, and serial SPI interface, but the channel count difference is a decisive constraint for drop-in substitution.
Channel Count
Validation required
Resolution
High match
Package Type
High match
Interface Type
High match
Parts at a glance
Part B
ADS7951SDBTG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 7822 PCS
- Package
- TFSOP-30
- 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 | ADS7953SBDBTR | ADS7951SDBTG4 | Why it matters |
|---|---|---|---|
| Number of Input Channels | 16 | 8 | Channel count determines how many analog signals can be multiplexed into the ADC; a 16-channel part cannot be directly substituted where 8 channels are sufficient, and vice versa affects board layout and system cost. |
| Resolution | 12 bit | 12 bit | Resolution sets the smallest measurable voltage step; matching 12-bit resolution means both parts offer equivalent measurement precision for the same reference. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum throughput determines the highest signal bandwidth the ADC can digitize; identical 1 MSPS ratings mean timing and anti-aliasing requirements remain unchanged. |
| Supply Voltage (Analog and Digital) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Operating supply range must match the system rail; identical ranges allow the same power supply design and level shifting to be reused. |
| Interface Type | SPI (Serial) | SPI (Serial) | The digital interface must be compatible with the host controller; both using SPI means firmware and bus timing can be reused without redesign. |
| Input Type | Single-ended | Single-ended | Single-ended inputs define how sensor signals connect; matching input topology means the same front-end signal conditioning can be applied. |
| Package / Pin Count | 38-pin TSSOP (DDB) | 30-pin TSSOP (DBT) | Package and pin count affect PCB footprint and routing; different footprints require a board redesign and cannot be drop-in substituted. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range must cover the application environment; identical industrial ranges ensure equivalent reliability under the same conditions. |
| Reference Type | External | External | Reference configuration determines accuracy and drift behavior; both requiring an external reference means the same reference circuit can be shared. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7953SBDBTR | ADS7951SDBTG4 |
|---|---|---|
| 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 | 16 | 8 |
| 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 | 2.7V ~ 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 ADS7953SBDBTR and the ADS7951SDBTG4?
The ADS7953SBDBTR is a 12-bit, 16-channel successive-approximation register (SAR) analog-to-digital converter (ADC) with a maximum throughput of 1 MSPS, while the ADS7951SDBTG4 is a 12-bit, 8-channel SAR ADC with a maximum throughput of 1 MSPS. Both devices are pin-compatible members of the Texas Instruments ADS795x family and share the same TSSOP-38 (DBT) package, but they differ in channel count and the ordering suffix (SBDBTR vs SDBTG4) reflects different product/qualification variants.
Are the ADS7953SBDBTR and ADS7951SDBTG4 pin-compatible?
Yes. Both devices are offered in the same 38-pin TSSOP (DBT) package and belong to the same ADS795x family, which is designed with a common pinout. However, the ADS7953SBDBTR provides 16 analog input channels while the ADS7951SDBTG4 provides 8 analog input channels, so the additional input pins on the ADS7953SBDBTR are not used on the ADS7951SDBTG4. Designers should verify the specific pin functions against the respective datasheets before substitution.
Do both ADCs support the same serial interface?
Yes. Both the ADS7953SBDBTR and ADS7951SDBTG4 use a SPI-compatible serial interface for communication with a host controller, supporting standard SPI modes. This allows both devices to be used with the same microcontroller or FPGA SPI peripheral, subject to the channel-count difference in the command and data frames.
What is the resolution and sampling rate of these ADCs?
Both the ADS7953SBDBTR and ADS7951SDBTG4 are 12-bit SAR ADCs with a maximum sampling rate of 1 MSPS. The resolution and throughput are identical across the two devices; the primary functional difference is the number of analog input channels (16 vs 8).
Can the ADS7951SDBTG4 be used as a drop-in replacement for the ADS7953SBDBTR?
Not directly as a functional drop-in replacement. Although both share the same package and pinout family, the ADS7951SDBTG4 has only 8 analog input channels versus 16 on the ADS7953SBDBTR. If the design uses more than 8 input channels, the ADS7951SDBTG4 cannot replace the ADS7953SBDBTR. For designs using 8 or fewer channels, the ADS7951SDBTG4 may be considered after validating the channel configuration and command set against the datasheet.
What is the difference between the "SBDBTR" and "SDBTG4" ordering suffixes?
The suffixes indicate different product variants and packaging/qualification options within the ADS795x family. The "SBDBTR" suffix on the ADS7953SBDBTR and the "SDBTG4" suffix on the ADS7951SDBTG4 reflect different ordering codes, which may correspond to differences in qualification level, packing format, or product revision. Designers should consult the official Texas Instruments product page and datasheet for the exact meaning of each suffix before ordering.
Do both devices operate from the same supply voltage?
Yes. Both the ADS7953SBDBTR and ADS7951SDBTG4 operate from a single analog supply in the 2.7 V to 5.5 V range, with a separate digital supply for the I/O interface. This common supply architecture allows both devices to be used in similar system power designs.