Part A
ADS7952QDBTRQ1
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 6054 個数
- Package
- TSSOP-38
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7951SDBTG4 is a functional replacement candidate for the ADS7952QDBTRQ1 in applications where 8-channel, 12-bit SAR ADC functionality is required and the automotive qualification of the original part is not mandatory. Both devices share the same TSSOP-38 footprint, SPI interface, and 1 MSPS throughput, but differ in channel count and qualification grade, so validation against the specific application's channel requirements and qualification constraints is recommended before substitution.
Channel Count
Validation required
Resolution and Throughput
High match
Package and Pinout
High match
Qualification Grade
Validation required
Parts at a glance
Part B
ADS7951SDBTG4
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 7822 個数
- Package
- TFSOP-30
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | ADS7952QDBTRQ1 | ADS7951SDBTG4 | Why it matters |
|---|---|---|---|
| Number of Input Channels | 12 | 8 | Channel count determines how many analog signals can be multiplexed into the ADC; a 12-channel part cannot directly replace an 8-channel part in a system needing only 8 inputs without layout changes, and vice versa. |
| Resolution | 12 bit | 12 bit | Resolution sets the smallest detectable analog step; both are 12-bit, so quantization performance is equivalent for substitutability. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum throughput must meet the system's signal bandwidth; identical 1 MSPS ratings mean timing budgets are preserved. |
| 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 power-rail compatibility. |
| Interface Type | SPI | SPI | The digital interface must match the host controller; both use SPI, so firmware and bus wiring remain compatible. |
| Package / Case | TSSOP-38 | TSSOP-38 | Package footprint and pinout must be compatible for board-level substitution; identical TSSOP-38 packages allow drop-in replacement. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Temperature range must cover the application environment; identical ratings ensure equivalent environmental robustness. |
| Qualification / Grade | AEC-Q100 (Automotive) | Industrial | Automotive qualification implies stricter reliability and testing; an industrial-grade part may not meet automotive mission profiles, affecting substitutability in automotive designs. |
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 | ADS7952QDBTRQ1 | ADS7951SDBTG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | Automotive, AEC-Q100 | microPOWER™ |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 12 | 8 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-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 |
| Features | PGA | - |
Frequently asked questions
What are the key differences between the ADS7952QDBTRQ1 and the ADS7951SDBTG4?
The ADS7952QDBTRQ1 is an automotive-qualified (AEC-Q100 Grade 1) 12-bit, 12-channel, 1-MSPS SAR ADC in a 38-pin TSSOP package, while the ADS7951SDBTG4 is a non-automotive 12-bit, 8-channel, 1-MSPS SAR ADC in a 30-pin TSSOP package. The primary differences are channel count (12 vs 8), package/pin count (38 vs 30), and automotive qualification status.
Are the ADS7952QDBTRQ1 and ADS7951SDBTG4 pin-to-pin or footprint compatible?
No. The ADS7952QDBTRQ1 uses a 38-pin TSSOP (DBT) package, while the ADS7951SDBTG4 uses a 30-pin TSSOP (DBT) package. The different pin counts and package body sizes mean the PCB land patterns are not interchangeable, so a direct drop-in replacement is not possible without a layout change.
Do both devices share the same resolution and sampling rate?
Yes. Both the ADS7952QDBTRQ1 and ADS7951SDBTG4 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 ADS7952QDBTRQ1 provides 12 analog input channels, whereas the ADS7951SDBTG4 provides 8 analog input channels. Both support single-ended inputs and are configured via a serial interface in the ADS795x family.
Is the ADS7952QDBTRQ1 automotive qualified while the ADS7951SDBTG4 is not?
Yes. The "Q1" suffix on the ADS7952QDBTRQ1 denotes Texas Instruments automotive Q1 qualification (AEC-Q100), making it suitable for automotive applications. The ADS7951SDBTG4 carries the "G4" suffix, which denotes a green/RoHS-compliant non-automotive grade device and does not carry AEC-Q100 qualification.
Do both ADCs use the same serial interface and reference configuration?
Yes. Both devices belong to the Texas Instruments ADS795x family and use a SPI-compatible serial interface with a similar command structure, and both support an external reference voltage on the REF pin as well as an internal reference option, per the family datasheet.
Can the ADS7951SDBTG4 be used as a substitute for the ADS7952QDBTRQ1 in an existing design?
Not directly. Although both are 12-bit, 1-MSPS SAR ADCs from the same family, the ADS7951SDBTG4 has only 8 channels versus 12 on the ADS7952QDBTRQ1, uses a different 30-pin package versus 38-pin, and lacks automotive Q1 qualification. Substitution requires a PCB redesign, channel-count revalidation, and confirmation that automotive qualification is not required.
Which device should be selected for an automotive application requiring 12 analog inputs?
The ADS7952QDBTRQ1 is the appropriate choice, as it provides 12 channels and carries AEC-Q100 Q1 automotive qualification. The ADS7951SDBTG4 offers only 8 channels and is not automotive qualified, so it would not meet a 12-channel automotive requirement.