Part A
ADS7953SBDBTR
德州儀器
- Lifecycle
- Active
- Stock
- 6896 件
- Package
- TSSOP-38
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS7951QDBTRQ1 and ADS7953SBDBTR share the same 12-bit SAR ADC architecture, TSSOP-38 footprint, and automotive qualification, making the ADS7953SBDBTR a viable functional upgrade candidate where the higher channel count and extended temperature range are acceptable. Designers should validate the increased channel count against their multiplexing scheme and confirm the wider operating temperature range aligns with application requirements before committing to a drop-in substitution.
Resolution and Architecture
High match
Channel Count
Validation required
Package and Footprint
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
ADS7951QDBTRQ1
德州儀器
- Lifecycle
- Active
- Stock
- 1482 件
- Package
- TSSOP-30
- Series
- 資料獲取-模數轉換器（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 | ADS7951QDBTRQ1 | ADS7953SBDBTR | Why it matters |
|---|---|---|---|
| Number of input channels | 8 single-ended | 16 single-ended | Channel count determines how many analog signals can be monitored; a 16-channel part cannot be substituted where 8 channels suffice without layout changes, and vice versa. |
| Resolution | 12 bit | 12 bit | Resolution sets the smallest measurable voltage step; both are 12-bit, so measurement granularity is equivalent. |
| Sampling rate (max) | 1 MSPS | 1 MSPS | Maximum throughput affects how fast signals can be digitized; identical rates mean timing budgets remain unchanged. |
| 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 allow direct replacement without regulator changes. |
| Interface | SPI (serial) | SPI (serial) | Digital interface compatibility determines whether the host MCU/FPGA firmware and pinout can be reused unchanged. |
| Package | TSSOP-30 (DBT) | TSSOP-38 (DBT) | Package footprint and pin count must match the PCB land pattern; different pin counts require a board redesign. |
| Operating temperature range | -40°C to +125°C (Q1 automotive) | -40°C to +125°C | Temperature grade affects reliability in harsh environments; both cover the automotive-grade range. |
| Input type | Single-ended | Single-ended | Input configuration determines signal conditioning needs; both single-ended, so front-end circuitry can be reused. |
| Qualification | AEC-Q100 qualified | Not AEC-Q100 qualified | Automotive qualification is mandatory for under-hood and safety-critical applications; the non-Q1 part cannot be used where AEC-Q100 is required. |
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 | ADS7953SBDBTR | ADS7951QDBTRQ1 |
|---|---|---|
| Series | microPOWER™ | Automotive, AEC-Q100 |
| Part Status | Active | Active |
| 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-PGA-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 |
| Features | - | PGA |
Frequently asked questions
What are the key differences between the ADS7951QDBTRQ1 and the ADS7953SBDBTR?
The ADS7951QDBTRQ1 is a 12-bit, 8-channel, 1-MSPS SAR ADC in a 30-pin TSSOP package (DBT), qualified to AEC-Q100 Grade 1 (Q1 automotive qualification). The ADS7953SBDBTR is a 12-bit, 16-channel, 1-MSPS SAR ADC in a 38-pin TSSOP package. The primary differences are channel count (8 vs. 16), package pin count (30 vs. 38), and the automotive Q1 qualification present on the ADS7951QDBTRQ1.
Are the ADS7951QDBTRQ1 and ADS7953SBDBTR pin-to-pin compatible?
No. The ADS7951QDBTRQ1 uses a 30-pin TSSOP (DBT) package, while the ADS7953SBDBTR uses a 38-pin TSSOP (DBT) package. The different pin counts and pinouts prevent direct pin-to-pin substitution on the same PCB land pattern.
Do both devices share the same resolution and sampling rate?
Yes. Both the ADS7951QDBTRQ1 and ADS7953SBDBTR are 12-bit successive-approximation register (SAR) ADCs with a maximum throughput of 1 MSPS, per the Texas Instruments ADS795x family datasheet.
What is the difference in input channel count between the two parts?
The ADS7951QDBTRQ1 provides 8 analog input channels, while the ADS7953SBDBTR provides 16 analog input channels. Both support single-ended inputs referenced to device ground, with the channel count being the primary functional differentiator.
Is the ADS7951QDBTRQ1 automotive qualified while the ADS7953SBDBTR is not?
The ADS7951QDBTRQ1 carries the "Q1" suffix indicating AEC-Q100 Grade 1 qualification for automotive applications. The ADS7953SBDBTR does not carry the Q1 designation and is specified for industrial-grade applications per the standard ADS7953 datasheet.
Do both ADCs use the same serial interface for communication?
Yes. Both devices use an SPI-compatible serial interface supporting daisy-chain operation, as documented in the Texas Instruments ADS795x family datasheet. The interface timing and command set are common across the family, though the channel address range differs (8 vs. 16 channels).
Can the ADS7953SBDBTR be used as a drop-in replacement for the ADS7951QDBTRQ1 in an existing design?
No. A drop-in replacement is not possible due to the different package pin counts (30-pin vs. 38-pin TSSOP), different pinouts, and the additional channel count on the ADS7953SBDBTR. Any substitution requires a PCB redesign and revalidation against the target application requirements.