Part A
ADS7951SBDBT
Техасские инструменты
- Lifecycle
- Active
- Stock
- 5323 ПКС
- Package
- TSSOP-30
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7951SBDBT is a viable functional replacement candidate for the ADS7950QDBTRQ1 in many designs, as both share the same 12-bit SAR architecture, 1 MSPS throughput, SPI interface, and TSSOP-30 footprint. However, the ADS7950QDBTRQ1 offers four single-ended channels with automotive Q1 qualification, while the ADS7951SBDBT provides eight single-ended channels without automotive qualification. Engineers should validate channel count requirements, input configuration, and qualification grade before substituting.
Resolution and Sample Rate
High match
Package and Pinout
High match
Channel Count and Input Configuration
Validation required
Qualification Grade
Validation required
Parts at a glance
Part B
ADS7950QDBTRQ1
Техасские инструменты
- Lifecycle
- Active
- Stock
- 6130 ПКС
- Package
- TSSOP-30
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | ADS7950QDBTRQ1 | ADS7951SBDBT | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so conversion resolution is equivalent and not a differentiator for substitutability. |
| Number of Input Channels | 4 single-ended | 8 single-ended | Channel count determines how many analog signals can be sampled; the ADS7951 supports twice as many inputs, which affects system architecture. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum throughput is identical, so timing and bandwidth requirements are met by either device. |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Both support the same analog supply range, allowing operation from common system rails. |
| Interface Type | SPI | SPI | Both use a serial SPI interface, so the host microcontroller connection is compatible. |
| Package / Mounting | TSSOP-16 (surface mount) | TSSOP-16 (surface mount) | Identical package and footprint allow drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both meet the same automotive/industrial temperature range, so environmental qualification is unaffected. |
| Qualification / Grade | AEC-Q100 qualified (automotive) | Industrial grade | The Q1 suffix denotes automotive qualification; substituting an industrial-grade part may not satisfy automotive reliability requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7951SBDBT | ADS7950QDBTRQ1 |
|---|---|---|
| Series | microPOWER™ | Automotive, AEC-Q100 |
| Part Status | Active | Active |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 8 | 4 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-S/H-ADC | MUX-PGA-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 ADS7950QDBTRQ1 and the ADS7951SBDBT?
The ADS7950QDBTRQ1 is an automotive-qualified (AEC-Q100 Grade 1) 12-bit, 4-channel, 1 MSPS SAR ADC in a 30-pin TSSOP package, specified over -40°C to +125°C. The ADS7951SBDBT is a 12-bit, 8-channel, 1 MSPS SAR ADC in a 30-pin TSSOP package specified over -40°C to +125°C but without automotive qualification. The primary differences are channel count (4 vs 8) and automotive qualification status.
Are the ADS7950QDBTRQ1 and ADS7951SBDBT pin-compatible?
Both devices are offered in the same 30-pin TSSOP (DBT) package, but they are not functionally pin-compatible because the ADS7950 provides 4 analog input channels while the ADS7951 provides 8 analog input channels, so the analog input pin assignments differ. Designers must verify pin functions against the respective datasheets before considering any layout reuse.
Do both ADCs share the same resolution and sampling rate?
Yes. Both the ADS7950QDBTRQ1 and ADS7951SBDBT 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 automotive qualification between these two parts?
The ADS7950QDBTRQ1 carries the Q1 suffix and is qualified to AEC-Q100 Grade 1, making it suitable for automotive applications. The ADS7951SBDBT does not carry an automotive Q1 qualification suffix and is intended for general-purpose industrial applications. The automotive qualification is a key selection criterion when the target design requires AEC-Q100 compliance.
What analog input configuration do these ADCs support?
Both devices are part of the ADS795x family and support single-ended analog inputs with a programmable input range, configurable via the internal reference and input range selection. The ADS7950QDBTRQ1 provides 4 single-ended channels, while the ADS7951SBDBT provides 8 single-ended channels. Designers should confirm the exact input range and reference configuration in the respective datasheets.
What serial interface do the ADS7950QDBTRQ1 and ADS7951SBDBT use?
Both devices use an SPI-compatible serial interface for configuration and data readout, consistent with the ADS795x family. The interface supports daisy-chain operation and is used to select channels, set the input range, and read conversion results.
Can the ADS7951SBDBT be used as a drop-in replacement for the ADS7950QDBTRQ1 in an automotive design?
No. Although both are 12-bit, 1 MSPS SAR ADCs in the same 30-pin TSSOP package, the ADS7951SBDBT lacks AEC-Q100 Grade 1 qualification and provides 8 channels instead of 4, so it is not a drop-in replacement in an automotive-qualified design. Any substitution requires validation of channel count, pin functions, qualification status, and firmware configuration against the target design requirements.
What supply voltage do these ADCs require?
Both devices operate from a single analog supply in the 2.7 V to 5.25 V range, consistent with the ADS795x family datasheet. The digital supply and reference configuration should be verified against the specific datasheet for each part before finalizing the power design.