Part A
ADS7950QDBTRQ1
德州儀器
- Lifecycle
- Active
- Stock
- 6130 件
- Package
- TSSOP-30
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS7951SDBTG4 is a viable functional replacement candidate for the ADS7950QDBTRQ1 in many designs, as both share the same 12-bit SAR architecture, 1 MSPS throughput, SPI interface, and TSSOP-30 footprint. However, the ADS7950QDBTRQ1 is an automotive-qualified device with a 4-channel input multiplexer, while the ADS7951SDBTG4 offers 8 channels without AEC-Q100 qualification, so the substitution requires validation of channel count requirements and automotive qualification needs.
Channel Count
Validation required
Resolution and Sampling Rate
High match
Package Type
High match
Automotive Qualification
Validation required
Parts at a glance
Part B
ADS7951SDBTG4
德州儀器
- Lifecycle
- Active
- Stock
- 7822 件
- Package
- TFSOP-30
- 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 | ADS7950QDBTRQ1 | ADS7951SDBTG4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so conversion precision is equivalent for substitutability. |
| Number of Input Channels | 4 single-ended | 8 single-ended | Channel count determines how many analog signals can be monitored; the ADS7951 supports twice as many inputs. |
| 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 | Matching analog supply range allows the same system rail to power either part. |
| Interface Type | SPI | SPI | Same serial interface simplifies firmware and hardware compatibility between the two parts. |
| Package / Case | TSSOP-30 | TSSOP-30 | Identical package footprint enables drop-in board replacement without layout changes. |
| Operating Temperature Range | -40°C to 125°C | -40°C to 125°C | Same temperature rating ensures both parts meet the same environmental requirements. |
| Qualification | AEC-Q100 (automotive) | Not automotive qualified | The Q1 suffix indicates automotive qualification; the ADS7951SDBTG4 lacks this, limiting use in automotive applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7950QDBTRQ1 | 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 | 4 | 8 |
| 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 ADS7951SDBTG4?
The ADS7950QDBTRQ1 is an automotive-qualified (AEC-Q100 Grade 1) 12-bit, 4-channel, 1-MSPS SAR ADC in a 30-pin TSSOP package, while the ADS7951SDBTG4 is a non-automotive 12-bit, 8-channel, 1-MSPS SAR ADC in a 30-pin TSSOP package. The primary differences are channel count (4 vs 8) and qualification grade (automotive Q1 vs industrial).
Are the ADS7950QDBTRQ1 and ADS7951SDBTG4 pin-compatible?
No. Although both devices are offered in a 30-pin TSSOP (DBT) package, the ADS7950QDBTRQ1 provides 4 analog input channels and the ADS7951SDBTG4 provides 8 analog input channels, so the analog input pin assignments differ. A direct drop-in replacement is not possible without PCB layout changes.
Do both devices support the same SPI interface and resolution?
Yes. Both the ADS7950QDBTRQ1 and ADS7951SDBTG4 are 12-bit successive-approximation register (SAR) ADCs with a SPI-compatible serial interface and a maximum throughput of 1 MSPS, per the Texas Instruments ADS795x family datasheet.
What is the difference in automotive qualification between these two parts?
The ADS7950QDBTRQ1 carries the Q1 suffix and is AEC-Q100 qualified for automotive applications, whereas the ADS7951SDBTG4 is a standard industrial-grade device without AEC-Q100 qualification. The automotive version should be selected for applications requiring AEC-Q100 compliance.
Can the ADS7951SDBTG4 be used as a substitute for the ADS7950QDBTRQ1 in an automotive design?
No. The ADS7951SDBTG4 is not AEC-Q100 qualified, so it does not meet the automotive qualification of the ADS7950QDBTRQ1. Additionally, the channel count differs (8 vs 4), so substitution requires design and qualification review against the target application requirements.
What analog input configuration do these ADCs support?
Both devices are part of the Texas Instruments ADS795x family, which supports single-ended analog inputs with a programmable input range and an on-chip multiplexer. The ADS7950QDBTRQ1 multiplexes 4 channels and the ADS7951SDBTG4 multiplexes 8 channels.
What supply voltage do the ADS7950QDBTRQ1 and ADS7951SDBTG4 require?
Both devices operate from a single analog supply in the 2.7 V to 5.25 V range with a separate digital I/O supply, as specified in the Texas Instruments ADS795x datasheet. Designers should confirm the exact recommended operating conditions in the latest datasheet revision.