Part A
ADS7961QDBTRQ1
德州儀器
- Lifecycle
- Active
- Stock
- 1800 件
- Package
- TSSOP-38
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS7961QDBTRQ1 and ADS7953SBDBTG4 are both automotive-qualified, 12-bit SAR ADCs from Texas Instruments with a similar TSSOP-38 footprint and comparable serial interface architecture, making them a viable functional replacement candidate. However, the ADS7953SBDBTG4 offers twice the channel count (16 versus 8) and a wider input voltage range, so the replacement is only appropriate where the higher channel count and input range are acceptable and the host firmware is updated to address the additional channels. Designers should validate the reference configuration, input range settings, and channel sequencing in the target application before committing to the substitution.
Channel Count
High match
Resolution and Architecture
High match
Package and Pinout
Validation required
Input Voltage Range
Validation required
Parts at a glance
Part B
ADS7953SBDBTG4
德州儀器
- Lifecycle
- Active
- Stock
- 4855 件
- Package
- TFSOP-38
- Series
- 資料獲取-模數轉換器（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 | ADS7961QDBTRQ1 | ADS7953SBDBTG4 | Why it matters |
|---|---|---|---|
| Resolution | 8 bit | 12 bit | Resolution determines the smallest measurable voltage step; a 12-bit device offers 16x finer quantization than an 8-bit device, directly affecting measurement accuracy. |
| Number of Input Channels | 16 | 16 | Channel count defines how many analog signals can be multiplexed into the ADC; both provide 16 single-ended inputs, so channel capacity is equivalent. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum sample rate limits the bandwidth of signals that can be digitized; identical 1 MSPS rates mean comparable throughput for both parts. |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Analog supply range determines compatibility with system rails and the input voltage span; matching ranges allow drop-in use in the same analog front end. |
| Interface Type | SPI | SPI | The digital interface must match the host controller; both use SPI, so firmware and bus wiring are compatible. |
| Package / Case | TSSOP-38 | TSSOP-38 | Package footprint and pinout affect PCB layout and assembly; identical TSSOP-38 packages support the same board footprint. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Temperature range indicates suitability for automotive and industrial environments; matching ranges ensure equivalent environmental robustness. |
| Input Type | Single-ended | Single-ended | Single-ended versus differential input topology affects signal conditioning and noise immunity; both being single-ended means the same sensor interface applies. |
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 | ADS7961QDBTRQ1 | ADS7953SBDBTG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | Automotive, AEC-Q100 | microPOWER™ |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 8 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 16 | 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 | 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 ADS7961QDBTRQ1 and the ADS7953SBDBTG4?
The ADS7961QDBTRQ1 is an automotive-qualified (AEC-Q100 Grade 1) 8-channel, 8-bit SAR ADC with a SPI interface, specified over a -40°C to +125°C temperature range. The ADS7953SBDBTG4 is a 16-channel, 12-bit SAR ADC with a SPI interface, specified over a -40°C to +125°C temperature range but not automotive-qualified. The primary differences are resolution (8-bit vs 12-bit), channel count (8 vs 16), and qualification level (automotive vs industrial).
Are the ADS7961QDBTRQ1 and ADS7953SBDBTG4 pin-compatible?
No. The ADS7961QDBTRQ1 is supplied in a 30-pin TSSOP (DBT) package, while the ADS7953SBDBTG4 is supplied in a 38-pin TSSOP (DBT) package. The different pin counts and pin functions prevent direct pin-to-pin substitution; the PCB land pattern and routing must be redesigned.
Can the ADS7953SBDBTG4 be used as a drop-in replacement for the ADS7961QDBTRQ1?
No. Beyond the package and pin-count mismatch, the two devices differ in resolution (12-bit vs 8-bit), channel count (16 vs 8), and register/command set details. A drop-in replacement is not possible; the design must be revalidated against the ADS7953SBDBTG4 datasheet, including SPI timing, reference requirements, and input configuration.
What is the resolution and channel count of each device?
The ADS7961QDBTRQ1 provides 8-bit resolution across 8 single-ended input channels. The ADS7953SBDBTG4 provides 12-bit resolution across 16 single-ended input channels. Both are successive-approximation register (SAR) ADCs with a SPI-compatible serial interface.
Do both devices support the same SPI interface and supply voltage?
Both devices use a SPI-compatible serial interface and operate from a single analog supply in the 2.7 V to 5.5 V range, with a separate digital I/O supply (VBD) for host interfacing. However, the command set, register map, and timing parameters differ between the two datasheets, so firmware must be adapted accordingly.
Which device is automotive-qualified?
Only the ADS7961QDBTRQ1 carries the Q1 automotive qualification suffix and is AEC-Q100 Grade 1 qualified, making it suitable for automotive applications. The ADS7953SBDBTG4 is an industrial-grade device and is not AEC-Q100 qualified; it should not be used in automotive safety- or reliability-critical designs requiring Q1 qualification.
What are the operating temperature ranges for these ADCs?
Both the ADS7961QDBTRQ1 and the ADS7953SBDBTG4 are specified for operation over the -40°C to +125°C temperature range, per their respective manufacturer datasheets. Designers should still verify application-specific thermal margins and derating requirements.
Which device should be selected for a high-channel-count, high-resolution application?
The ADS7953SBDBTG4 is the appropriate choice when 16 channels and 12-bit resolution are required in an industrial application. The ADS7961QDBTRQ1 is better suited to automotive applications needing 8 channels at 8-bit resolution with AEC-Q100 Grade 1 qualification. Selection should be based on channel count, resolution, qualification level, and package constraints.