Part A
ADS7950QDBTRQ1
Texas Instruments
- Lifecycle
- Active
- Stock
- 6130 PCS
- Package
- TSSOP-30
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7950QDBTRQ1 and ADS7953SBDBTG4 are both automotive-qualified, 12-bit SAR ADCs from the ADS795x family sharing a compatible TSSOP-38 footprint and SPI interface, making them viable functional replacement candidates. However, the ADS7953SBDBTG4 offers twice the channel count (16 single-ended vs. 8 single-ended) and a wider supply range, so the replacement is only appropriate where the additional channels and supply headroom are acceptable and the host firmware is updated to address the expanded channel multiplexer.
Channel Count
Validation required
Resolution
High match
Package Type
High match
Supply Voltage Range
Validation required
Parts at a glance
Part B
ADS7953SBDBTG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4855 PCS
- Package
- TFSOP-38
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADS7953SBDBTG4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so conversion resolution is equivalent and not a differentiator. |
| Number of Input Channels | 4 single-ended | 16 single-ended | Channel count determines how many analog signals can be multiplexed into one ADC; this is a major functional difference. |
| Sampling Rate | 1 MSPS | 1 MSPS | Identical throughput means 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 | Same analog supply range allows both to interface with the same signal chain voltages. |
| Interface Type | SPI | SPI | Both use SPI, so the host microcontroller interface is compatible without redesign. |
| Package / Case | TSSOP-30 | TSSOP-38 | Different package pin counts affect PCB footprint and layout, requiring board changes for substitution. |
| Operating Temperature Range | -40°C to 125°C | -40°C to 125°C | Equivalent temperature ratings mean both suit the same environmental conditions. |
| Input Type | Single-ended | Single-ended | Same input configuration means signal conditioning requirements are unchanged. |
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 | ADS7950QDBTRQ1 | ADS7953SBDBTG4 |
|---|---|---|
| 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 | 4 | 16 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-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 ADS7950QDBTRQ1 and the ADS7953SBDBTG4?
The ADS7950QDBTRQ1 is an automotive-qualified (AEC-Q100 Grade 1) 12-bit, 4-channel SAR ADC with a SPI interface, supplied in a 30-pin TSSOP (DBT) package. The ADS7953SBDBTG4 is a 12-bit, 16-channel SAR ADC in a 38-pin TSSOP (DBT) package. The primary differences are channel count (4 vs. 16), package pin count (30 vs. 38), and the automotive qualification of the ADS7950QDBTRQ1.
Are the ADS7950QDBTRQ1 and ADS7953SBDBTG4 pin-to-pin or footprint compatible?
No. The ADS7950QDBTRQ1 uses a 30-pin TSSOP package, while the ADS7953SBDBTG4 uses a 38-pin TSSOP package. The different pin counts and pinouts mean they are not drop-in replacements and require different PCB land patterns.
Do both devices share the same resolution and sampling architecture?
Yes. Both are 12-bit successive-approximation-register (SAR) ADCs from the ADS795x family, offering 12-bit resolution with a SPI-compatible serial interface for communication with host controllers.
What is the difference in input channel count between the two parts?
The ADS7950QDBTRQ1 provides 4 analog input channels, whereas the ADS7953SBDBTG4 provides 16 analog input channels. This makes the ADS7953SBDBTG4 suited to higher-channel-count multiplexed acquisition systems.
Is the ADS7950QDBTRQ1 automotive qualified, and is the ADS7953SBDBTG4?
The ADS7950QDBTRQ1 carries the Q1 suffix indicating automotive AEC-Q100 qualification, making it suitable for automotive applications. The ADS7953SBDBTG4 does not carry the Q1 automotive qualification suffix and is intended for general-purpose applications.
Can the ADS7953SBDBTG4 be used as a direct substitute for the ADS7950QDBTRQ1 in an existing design?
No. Beyond the different package and pin count, the channel count differs (16 vs. 4), and the ADS7953SBDBTG4 lacks the automotive Q1 qualification. Any substitution requires schematic, layout, firmware, and qualification review against the target design requirements.