Part A
ADS7953QDBTRQ1
シーラス・ロジック社
- Lifecycle
- Active
- Stock
- 1543 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
Not a drop-in replacement
The ADS7953QDBTRQ1 and ADS7951SDBTG4 are not drop-in replacements for one another. Although both are 12-bit SAR ADCs from the same family in a TSSOP-38 package, they differ in channel count, input configuration, and automotive qualification, so the ADS7951SDBTG4 cannot directly substitute the ADS7953QDBTRQ1 in an existing design without schematic and layout changes.
Different channel count
Different input configuration
Different qualification grade
Different pin assignment
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 | ADS7953QDBTRQ1 | ADS7951SDBTG4 | Why it matters |
|---|---|---|---|
| Number of Input Channels | 16 | 8 | Channel count determines how many analog signals can be multiplexed into the ADC; a 16-channel part cannot be directly substituted where 8 channels are sufficient, and vice versa affects board layout and cost. |
| Resolution | 12 bit | 12 bit | Resolution sets the smallest detectable analog step; both are 12-bit, so measurement granularity is equivalent. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum throughput affects how fast the system can acquire signals; 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 the same power design to be reused. |
| Interface Type | SPI | SPI | Serial interface compatibility ensures the same host controller and firmware protocol can drive either device. |
| Package / Case | TSSOP-38 | TSSOP-38 | Package footprint and pin count must match for drop-in board replacement; identical packages simplify substitution. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Temperature range determines suitability for automotive/industrial environments; matching ranges preserve environmental qualification. |
| Automotive Qualification | AEC-Q100 Qualified | Not AEC-Q100 Qualified | AEC-Q100 qualification is required for automotive applications; the non-qualified part cannot be used in automotive designs without requalification. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7953QDBTRQ1 | 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 | 16 | 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 ADS7953QDBTRQ1 and the ADS7951SDBTG4?
The ADS7953QDBTRQ1 is a 12-bit, 16-channel successive-approximation register (SAR) analog-to-digital converter (ADC) qualified to AEC-Q100 Grade 1, while the ADS7951SDBTG4 is a 12-bit, 8-channel SAR ADC in the same TSSOP-38 (DBT) package family. The primary differences are channel count (16 vs 8), automotive qualification (Q1 vs non-Q1), and the associated operating temperature range.
Are the ADS7953QDBTRQ1 and ADS7951SDBTG4 pin-compatible?
Both devices are offered in a 38-pin TSSOP (DBT) package, but they are not functionally pin-compatible because the ADS7953 provides 16 analog input channels while the ADS7951 provides 8. Pin assignments for the additional input channels and associated control signals differ, so a direct drop-in replacement is not supported without schematic and layout review against the respective datasheets.
Do both ADCs share the same resolution and sampling architecture?
Yes. Both the ADS7953QDBTRQ1 and ADS7951SDBTG4 are 12-bit SAR ADCs from the ADS795x family, featuring a programmable input multiplexer, sample-and-hold, and SPI-compatible serial interface. Resolution and conversion architecture are common across the family, while channel count and qualification grade differ.
What is the automotive qualification status of each device?
The ADS7953QDBTRQ1 carries the "Q1" suffix indicating AEC-Q100 qualification for automotive applications. The ADS7951SDBTG4 does not carry the Q1 designation and is intended for industrial/general-purpose use. Designs requiring automotive qualification should use the Q1-graded variant.
Can the ADS7951SDBTG4 replace the ADS7953QDBTRQ1 in an existing design?
Not directly. The ADS7951SDBTG4 provides only 8 analog input channels versus 16 on the ADS7953QDBTRQ1, and it lacks the automotive Q1 qualification. Replacement requires verifying channel count requirements, firmware multiplexer sequencing, PCB pin mapping, and qualification requirements against the target application.
What interface do these ADCs use for communication with a host controller?
Both devices use an SPI-compatible serial interface for configuration and data readback, consistent with the ADS795x family architecture. Host firmware must account for the different channel counts when configuring the multiplexer and sequencing conversions.
Which device should be selected for a high-channel-count automotive sensor interface?
The ADS7953QDBTRQ1 is the appropriate choice when 16 analog channels and AEC-Q100 Grade 1 qualification are required, such as in automotive sensor monitoring. The ADS7951SDBTG4 is better suited to lower-channel-count, non-automotive applications where 8 channels are sufficient.