Part A
ADS7955QDBTRQ1
Texas Instruments
- Lifecycle
- Active
- Stock
- 7159 Stückzahl
- Package
- TSSOP-30
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7955QDBTRQ1 is a functionally compatible replacement candidate for the ADS7951SBDBT, sharing the same 12-bit SAR architecture, 1 MSPS throughput, and TSSOP-30 footprint, though the automotive-qualified Q1 variant differs in channel count and input configuration, so system-level validation of the multiplexer setup and timing is recommended before substitution.
Resolution and Sample Rate
High match
Package and Pin Footprint
High match
Channel Count and Input Configuration
Not compatible
Operating Temperature and Qualification
Validation required
Parts at a glance
Part B
ADS7951SBDBT
Texas Instruments
- Lifecycle
- Active
- Stock
- 5323 Stückzahl
- Package
- TSSOP-30
- Series
- Datenerfassung mit 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 | ADS7955QDBTRQ1 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 10 bit | Resolution determines the smallest measurable voltage step; a 12-bit ADC provides 4x finer quantization than a 10-bit ADC, directly affecting measurement accuracy. |
| Number of Input Channels | 8 single-ended | 8 single-ended | Channel count defines how many analog signals can be multiplexed into the ADC; matching channel counts supports similar sensor-array architectures. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum sample rate limits the bandwidth of signals that can be digitized; equal rates mean comparable throughput for the same signal chain. |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Analog supply range determines compatibility with the system rail and the input voltage span; identical ranges allow drop-in use in the same power domain. |
| Interface | SPI (serial) | SPI (serial) | The digital interface must match the host controller; both using SPI means the same firmware and bus wiring can be reused. |
| Input Type | Single-ended | Single-ended | Single-ended inputs simplify front-end design versus differential; matching input topology preserves the sensor interface. |
| Package | TSSOP-30 (DBT) | TSSOP-30 (DBT) | Package footprint and pinout must match for board-level interchangeability; identical TSSOP-30 packages allow the same PCB land pattern. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Temperature range defines the environments where the part is qualified; matching ranges support the same application conditions. |
| Automotive Qualification | Not AEC-Q100 qualified | AEC-Q100 qualified (Q1) | AEC-Q100 qualification is required for automotive use; the Q1 variant is qualified while the standard variant is not, affecting suitability for automotive designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7955QDBTRQ1 | ADS7951SBDBT |
|---|---|---|
| Series | Automotive, AEC-Q100 | microPOWER™ |
| Part Status | Active | Active |
| Number of Bits | 10 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 8 | 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 |
| Features | PGA | - |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the ADS7951SBDBT and the ADS7955QDBTRQ1?
The ADS7951SBDBT is a 12-bit, 1-MSPS, 8-channel SAR ADC in a 30-pin TSSOP package, specified for the -40°C to +125°C temperature range. The ADS7955QDBTRQ1 is a 10-bit, 1-MSPS, 8-channel SAR ADC in a 30-pin TSSOP package that is AEC-Q100 qualified for automotive applications. The primary differences are resolution (12-bit vs 10-bit) and qualification grade (industrial vs automotive Q1).
Are the ADS7951SBDBT and ADS7955QDBTRQ1 pin-compatible?
Both devices are offered in the same 30-pin TSSOP (DBT) package and share the same pinout family for the ADS795x/ADS7955 series, including the SPI interface, channel inputs, and reference pins. However, designers should verify the specific pin functions against the respective datasheets before layout substitution, since the ADS7951 and ADS7955 differ in resolution and some configuration details.
What is the resolution and sampling rate of each device?
The ADS7951SBDBT provides 12-bit resolution at a maximum throughput of 1 MSPS. The ADS7955QDBTRQ1 provides 10-bit resolution at a maximum throughput of 1 MSPS. Both use a successive-approximation register (SAR) architecture with an SPI-compatible serial interface.
Is the ADS7955QDBTRQ1 suitable for automotive applications while the ADS7951SBDBT is not?
Yes. The ADS7955QDBTRQ1 carries the Q1 designation and is AEC-Q100 qualified, making it intended for automotive and other high-reliability applications. The ADS7951SBDBT is an industrial-grade device and is not AEC-Q100 qualified. Designers requiring automotive qualification should select the Q1 variant.
What input channels and interface do these ADCs support?
Both devices are 8-channel, multiplexed-input SAR ADCs with a SPI-compatible serial interface for configuration and data readback. The channel count and serial interface topology are common across the ADS7951 and ADS7955 families, allowing similar firmware structure, though register maps and resolution-dependent data formatting must be checked per datasheet.
Can the ADS7951SBDBT be used as a drop-in replacement for the ADS7955QDBTRQ1 in an existing design?
Not as a direct drop-in in all cases. Although both are 8-channel, 1-MSPS SAR ADCs in the same 30-pin TSSOP package, the ADS7951SBDBT offers 12-bit resolution versus 10-bit on the ADS7955QDBTRQ1, and the ADS7951SBDBT is not AEC-Q100 qualified. System firmware, timing margins, and qualification requirements must be revalidated before substitution.
What are the operating temperature ranges for these two ADCs?
The ADS7951SBDBT is specified over the -40°C to +125°C industrial temperature range. The ADS7955QDBTRQ1 is specified over the -40°C to +125°C range as an AEC-Q100 qualified automotive device. Both cover the same ambient temperature span, but only the Q1 variant carries automotive qualification.