Part A
ADS7959QDBTRQ1
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 6120 PCS
- Package
- TSSOP-30
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7959QDBTRQ1 is a functionally compatible replacement candidate for the ADS7953SBDBTR, sharing the same 12-bit SAR architecture, 1 MSPS throughput, and TSSOP-38 footprint, though the automotive-qualified device offers eight single-ended channels versus sixteen and requires careful validation of channel-count-dependent system behavior.
Resolution and Sample Rate
High match
Channel Count
Validation required
Package and Pinout
High match
Qualification Grade
Validation required
Parts at a glance
Part B
ADS7953SBDBTR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 6896 PCS
- Package
- TSSOP-38
- Series
- Data Acquisition - 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 | ADS7953SBDBTR | ADS7959QDBTRQ1 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 12 | 8 | Resolution determines the smallest measurable voltage step; a 12-bit ADC provides 16x finer quantization than an 8-bit ADC, directly affecting measurement accuracy and substitutability. |
| Number of Input Channels | 16 | 8 | Channel count defines how many analog signals can be multiplexed into the ADC; a 16-channel part cannot be replaced by an 8-channel part in systems needing more inputs. |
| Sampling Rate (max) | 1 MSPS | 1 MSPS | Maximum throughput determines how fast signals can be digitized; matching rates support timing-compatible substitution in the same signal chain. |
| 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 drop-in use without level shifting or regulator changes. |
| Interface Type | SPI (serial) | SPI (serial) | A matching serial interface ensures the host controller firmware and bus wiring remain compatible when swapping parts. |
| Input Type | Single-ended | Single-ended | Single-ended inputs simplify front-end design; matching input topology preserves signal conditioning circuitry compatibility. |
| Package / Mounting | TSSOP-38 (surface mount) | TSSOP-38 (surface mount) | Package and footprint must match for PCB layout compatibility; identical packages allow direct board-level substitution. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Temperature range determines suitability for automotive/industrial environments; matching ranges ensure equivalent environmental robustness. |
| Qualification / Grade | Industrial | Automotive (AEC-Q100) | Automotive qualification implies stricter reliability screening; an industrial part may not meet automotive mission-profile 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 | ADS7959QDBTRQ1 | ADS7953SBDBTR |
|---|---|---|
| Series | Automotive, AEC-Q100 | microPOWER™ |
| Part Status | Active | Active |
| Number of Bits | 8 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 8 | 16 |
| 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 | 2.7V ~ 5.25V |
| Features | PGA | - |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the ADS7953SBDBTR and the ADS7959QDBTRQ1?
The ADS7953SBDBTR is a 12-bit, 16-channel, 1-MSPS SAR ADC in a TSSOP-38 package, specified for the -40°C to +125°C temperature range. The ADS7959QDBTRQ1 is an automotive-qualified (AEC-Q100 Grade 1) 8-bit, 8-channel, 1-MSPS SAR ADC in a TSSOP-30 package. Key differences include resolution (12-bit vs 8-bit), channel count (16 vs 8), package/pin count (38 vs 30), and qualification level (industrial vs automotive AEC-Q100).
Are the ADS7953SBDBTR and ADS7959QDBTRQ1 pin-to-pin or footprint compatible?
No. The ADS7953SBDBTR uses a 38-pin TSSOP (DDB) package, while the ADS7959QDBTRQ1 uses a 30-pin TSSOP (DBT) package. The different pin counts and package body sizes mean the PCB land patterns and pin functions are not interchangeable, so a direct drop-in replacement is not possible without a layout redesign.
Do both devices support the same serial interface?
Both devices use an SPI-compatible serial interface for configuration and data readback, consistent with the ADS795x family architecture. However, because the channel counts and resolution differ, the command framing and conversion data word lengths differ (12-bit vs 8-bit output data), so host firmware must be adapted accordingly.
What are the sampling rate and supply requirements for these ADCs?
Both the ADS7953SBDBTR and ADS7959QDBTRQ1 are specified for a 1-MSPS maximum sampling rate. Both operate from a single analog supply in the 2.7 V to 5.25 V range with a separate digital I/O supply (VBD) for host interfacing, per the respective TI datasheets. Always confirm exact supply limits against the latest official datasheet before design.
Is the ADS7959QDBTRQ1 automotive qualified, and is the ADS7953SBDBTR?
The ADS7959QDBTRQ1 carries the Q1 suffix and is AEC-Q100 qualified for automotive applications (Grade 1 temperature range). The ADS7953SBDBTR is an industrial-grade device and is not AEC-Q100 qualified. For automotive designs requiring qualification documentation, the Q1 variant is the appropriate choice.
Can the ADS7953SBDBTR be used as a substitute for the ADS7959QDBTRQ1 in an existing design?
Not directly. Beyond the package and pin-count mismatch (38-pin vs 30-pin TSSOP), the resolution differs (12-bit vs 8-bit) and the automotive qualification status differs. Substitution would require a PCB redesign, firmware changes for the different data format, and re-validation against the target application's accuracy and qualification requirements.
Which device offers higher resolution and more input channels?
The ADS7953SBDBTR offers higher resolution (12-bit) and more input channels (16 single-ended channels) compared to the ADS7959QDBTRQ1, which provides 8-bit resolution with 8 channels. The trade-off is that the ADS7953SBDBTR is not automotive qualified and uses a larger 38-pin package.