Part A
ADS7957QDBTRQ1
Texas Instruments
- Lifecycle
- Active
- Stock
- 2380 PCS
- Package
- TSSOP-38
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7957QDBTRQ1 and ADS7952SBDBTG4 are both automotive-qualified, 12-bit SAR analog-to-digital converters from the ADS79xx family, sharing a compatible TSSOP-38 footprint and similar serial interface architecture. However, they differ in channel count and input multiplexer configuration, so the ADS7952SBDBTG4 can serve as a functional substitute only when the reduced channel count and adjusted input routing are acceptable for the target application. Designers should validate channel requirements and input configuration before committing to a drop-in replacement.
Channel Count
Validation required
Resolution
High match
Package Type
High match
Input Configuration
Validation required
Parts at a glance
Part B
ADS7952SBDBTG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 3680 PCS
- Package
- TFSOP-38
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | ADS7957QDBTRQ1 | ADS7952SBDBTG4 | Why it matters |
|---|---|---|---|
| Resolution | 10 bit | 12 bit | Resolution determines the smallest measurable voltage step; a 12-bit device offers four times finer quantization than a 10-bit device, affecting measurement accuracy. |
| Number of Input Channels | 16 | 12 | Channel count defines how many analog signals can be multiplexed into the ADC; a system needing 16 inputs cannot directly substitute a 12-channel part. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum throughput determines how fast signals can be digitized; both parts share the same 1 MSPS rate, so 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 the same power design to be reused. |
| Interface Type | SPI | SPI | The digital interface must be compatible with the host controller; both use SPI, simplifying firmware reuse. |
| Input Type | Single-ended | Single-ended | Single-ended inputs simplify signal conditioning and grounding compared to differential inputs; matching types preserves the analog front-end design. |
| Package / Case | TSSOP-38 | TSSOP-38 | Package footprint and pin count must match for board-level drop-in compatibility; identical TSSOP-38 packages allow the same PCB land pattern. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Temperature range must cover the application environment; matching automotive-grade ranges ensure equivalent environmental robustness. |
| Qualification | AEC-Q100 (automotive) | Catalog grade | Automotive qualification affects reliability screening and documentation; a catalog-grade part may not satisfy automotive reliability requirements. |
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 | ADS7957QDBTRQ1 | ADS7952SBDBTG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | Automotive, AEC-Q100 | microPOWER™ |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 10 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 16 | 12 |
| 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 ADS7957QDBTRQ1 and the ADS7952SBDBTG4?
The ADS7957QDBTRQ1 is a 10-bit, 16-channel, 1-MSPS SAR ADC in a 38-pin TSSOP package that is AEC-Q100 qualified for automotive applications. The ADS7952SBDBTG4 is a 12-bit, 8-channel, 1-MSPS SAR ADC in a 30-pin TSSOP package. The primary differences are resolution (10-bit vs 12-bit), channel count (16 vs 8), package pin count (38 vs 30), and the automotive qualification of the ADS7957QDBTRQ1.
Are the ADS7957QDBTRQ1 and ADS7952SBDBTG4 pin-to-pin compatible?
No. The ADS7957QDBTRQ1 uses a 38-pin TSSOP package, while the ADS7952SBDBTG4 uses a 30-pin TSSOP package. The different pin counts and pinouts prevent direct pin-to-pin substitution; a PCB redesign or layout change would be required.
Do both devices support the same serial interface?
Yes. Both the ADS7957QDBTRQ1 and ADS7952SBDBTG4 use a SPI-compatible serial interface for communication with a host controller, supporting standard SPI mode operation for configuration and data readback.
What is the maximum sampling rate of each device?
Both the ADS7957QDBTRQ1 and the ADS7952SBDBTG4 are specified for a maximum sampling rate of 1 MSPS (1 megasample per second).
What is the difference in resolution and channel count between the two parts?
The ADS7957QDBTRQ1 provides 10-bit resolution with 16 single-ended input channels. The ADS7952SBDBTG4 provides 12-bit resolution with 8 single-ended input channels. The ADS7952SBDBTG4 therefore offers higher resolution but half the channel count of the ADS7957QDBTRQ1.
Is the ADS7957QDBTRQ1 qualified for automotive use while the ADS7952SBDBTG4 is not?
The ADS7957QDBTRQ1 carries the Q1 suffix and is AEC-Q100 qualified for automotive applications. The ADS7952SBDBTG4 is a standard industrial-grade device and is not AEC-Q100 qualified. Automotive qualification should be confirmed against the respective manufacturer datasheets for the specific grade required.
Can the ADS7952SBDBTG4 be used as a drop-in replacement for the ADS7957QDBTRQ1?
No. The devices differ in resolution (12-bit vs 10-bit), channel count (8 vs 16), package (30-pin vs 38-pin TSSOP), and automotive qualification. A drop-in replacement is not possible without validating all of these differences against the target design requirements and manufacturer documentation.