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 ADS7951SDBTG4 are functionally equivalent 12-bit, 8-channel SAR ADCs from Texas Instruments, sharing identical core specifications including resolution, channel count, interface, and supply requirements. The only distinguishing factor is the package/ordering designation, making the ADS7951SDBTG4 a viable functional replacement candidate for the ADS7951SBDBT, subject to final validation of the specific ordering suffix requirements for the target application.
Resolution and Channel Count
High match
Interface Type
High match
Supply Voltage Range
High match
Package and Ordering Variant
Validation required
Parts at a glance
Part B
ADS7951SDBTG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 7822 PCS
- Package
- TFSOP-30
- 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 | ADS7951SDBTG4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Determines the smallest analog voltage change the ADC can resolve; identical resolution means equivalent measurement precision. |
| Number of Channels | 8 | 8 | Defines how many analog inputs can be multiplexed into the ADC; matching channel count ensures the same system-level input capacity. |
| Sampling Rate | 1 MSPS | 1 MSPS | Sets the maximum conversion throughput; identical rates mean the same signal bandwidth and timing budget can be supported. |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Determines compatibility with the system power rail and the usable input range; matching ranges allow drop-in replacement. |
| Interface Type | SPI | SPI | Defines the digital communication protocol with the host; identical interface ensures firmware and pin-level compatibility. |
| Input Type | Single-ended | Single-ended | Specifies whether inputs are measured relative to ground or differentially; matching input topology preserves signal conditioning design. |
| Package / Mounting | 32-TSSOP (Surface Mount) | 32-TSSOP (Surface Mount) | Determines PCB footprint and assembly compatibility; identical package allows the same board layout to be reused. |
| Operating Temperature Range | -40 °C to 125 °C | -40 °C to 125 °C | Defines the environmental envelope for reliable operation; matching ranges ensure equivalent thermal robustness. |
| Reference Type | External | External | Indicates whether the ADC uses an internal or external voltage reference; matching reference topology preserves accuracy and design flexibility. |
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 | 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 | 8 | 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 | 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 the ADS7951SDBTG4?
Both devices are functionally identical 12-bit, 1-MSPS, 8-channel SAR ADCs from Texas Instruments in a 30-pin TSSOP (DBT) package. The difference is the ordering suffix: the ADS7951SBDBT is supplied in tube/rail packaging, while the ADS7951SDBTG4 is supplied in tape-and-reel packaging (the "G4" suffix denotes Green/RoHS-compliant tape-and-reel ordering). Electrical performance and pinout are the same.
Are the ADS7951SBDBT and ADS7951SDBTG4 electrically and functionally interchangeable?
Yes. Both are the same ADS7951S silicon (12-bit resolution, 1-MSPS throughput, 8 single-ended/4 pseudo-differential channels, SPI interface, 2.7 V to 5.25 V analog supply) in the same 30-pin TSSOP package. They differ only in factory packaging format, so they are interchangeable in a design provided the board accepts the respective delivery format.
What is the difference between the "BDBT" and "DBTG4" suffixes?
The "DBT" portion identifies the 30-pin TSSOP package. The trailing "G4" indicates Green (RoHS-compliant, lead-free) tape-and-reel packaging. The ADS7951SBDBT is the tube/rail version, and the ADS7951SDBTG4 is the tape-and-reel version of the same device.
Do both parts have the same pinout and package footprint?
Yes. Both are offered in the same 30-pin TSSOP (DBT) package with identical pin assignments, so the PCB land pattern and footprint are the same for both orderable part numbers.
Which part should be selected for automated SMT assembly?
The ADS7951SDBTG4, because its tape-and-reel packaging is intended for automated pick-and-place assembly. The ADS7951SBDBT in tubes/rails is typically used for prototyping, low-volume, or manual assembly.
Are both parts RoHS-compliant and lead-free?
The ADS7951SDBTG4 carries the "G4" designation indicating Green/RoHS-compliant, lead-free construction. Designers should confirm the RoHS status of the specific ADS7951SBDBT orderable part number against the manufacturer's datasheet and packaging information before finalizing compliance documentation.
What are the core specifications shared by both devices?
Both are 12-bit successive-approximation ADCs with up to 1 MSPS throughput, 8 single-ended or 4 pseudo-differential input channels, an SPI-compatible serial interface, and operation from a 2.7 V to 5.25 V analog supply, in a 30-pin TSSOP package. These parameters are common to the ADS7951S family and apply equally to both orderable part numbers.