Part A
ADS7961QDBTRQ1
Texas Instruments
- Lifecycle
- Active
- Stock
- 1800 Stückzahl
- Package
- TSSOP-38
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7961QDBTRQ1 and ADS7961SDBTRG4 are functionally equivalent 8-channel, 12-bit SAR ADCs in the same TSSOP-38 package, sharing identical resolution, channel count, and footprint. The primary distinction is qualification grade: the Q1 variant is AEC-Q100 automotive-qualified while the S variant is the standard industrial-grade version. Designers should confirm the required qualification level and operating temperature range for their application before substituting.
Resolution and Channel Count
High match
Package and Pinout
High match
Supply Voltage Range
High match
Qualification Grade
Validation required
Parts at a glance
Part B
ADS7961SDBTRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 7627 Stückzahl
- Package
- TFSOP-38
- Series
- Datenerfassung mit 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 | ADS7961QDBTRQ1 | ADS7961SDBTRG4 | Why it matters |
|---|---|---|---|
| Resolution | 8 bit | 8 bit | Determines the quantization step and achievable measurement precision; identical resolution means equivalent measurement granularity. |
| Number of Input Channels | 16 single-ended / 8 pseudo-differential | 16 single-ended / 8 pseudo-differential | Defines how many analog signals can be multiplexed into the ADC; matching channel count ensures the same system-level input capacity. |
| Sampling Rate | 1 MSPS | 1 MSPS | Sets the maximum conversion throughput; identical sampling rate means the same signal bandwidth and timing budget can be supported. |
| Supply Voltage (Analog & Digital) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Determines compatibility with the system power rail and input voltage range; matching supply range allows drop-in use in the same rail design. |
| Interface Type | SPI (serial) | SPI (serial) | Defines the digital communication protocol with the host; identical SPI interface ensures firmware and pin-level compatibility. |
| Package / Pin Count | TSSOP-38 (DBT) | TSSOP-38 (DBT) | Footprint and pinout must match for board-level interchangeability; identical package allows the same PCB land pattern. |
| Operating Temperature Range | -40 °C to +125 °C (automotive Q1) | -40 °C to +125 °C | Defines the environmental envelope; the Q1 variant is AEC-Q100 qualified for automotive use, which may be required in automotive designs. |
| Qualification / Grade | AEC-Q100 qualified (automotive) | Industrial grade | Automotive qualification implies stricter testing and reliability screening; substituting an industrial part in an automotive application may violate qualification requirements. |
| Reference Type | Internal / external selectable | Internal / external selectable | Affects accuracy and design flexibility; matching reference options allows the same biasing and calibration scheme to be reused. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7961QDBTRQ1 | ADS7961SDBTRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | Automotive, AEC-Q100 | microPOWER™ |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 8 | 8 |
| 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 ADS7961SDBTRG4?
The primary difference is their qualification and ordering status. The ADS7961QDBTRQ1 is an automotive-qualified device (Q1 suffix) manufactured by Texas Instruments, while the ADS7961SDBTRG4 is the non-automotive industrial-grade version. Both are 8-channel, 12-bit successive-approximation ADCs in a 38-pin TSSOP package, but the Q1 variant is tested and qualified to AEC-Q100 standards for automotive applications.
Are the ADS7961QDBTRQ1 and ADS7961SDBTRG4 pin-compatible?
Yes. Both devices are offered in the same 38-pin TSSOP (DBT) package with identical pin assignments, as documented in the respective Texas Instruments datasheets. This allows the automotive-qualified ADS7961QDBTRQ1 to be used on a PCB designed for the ADS7961SDBTRG4 without layout changes, provided the application requirements are met.
Do both parts share the same resolution and channel count?
Yes. Both the ADS7961QDBTRQ1 and ADS7961SDBTRG4 are 12-bit successive-approximation analog-to-digital converters with 8 single-ended input channels. They share the same core conversion architecture and resolution, so the digital output format and channel configuration are identical between the two variants.
What is the difference in operating temperature range between these two parts?
The ADS7961QDBTRQ1 is qualified for the automotive temperature range of -40°C to +125°C, consistent with AEC-Q100 Grade 1 requirements. The ADS7961SDBTRG4 is specified for the industrial temperature range of -40°C to +85°C. Designs requiring operation above +85°C should use the Q1 variant.
Can the ADS7961SDBTRG4 be used as a drop-in replacement for the ADS7961QDBTRQ1 in an automotive design?
No. The ADS7961SDBTRG4 is not AEC-Q100 qualified and is only specified to +85°C, so it does not meet the qualification and temperature requirements of automotive applications that mandate the ADS7961QDBTRQ1. Substitution in the reverse direction (Q1 replacing the S variant) is generally acceptable where the wider temperature range and automotive qualification are not detrimental.
Do both devices support the same serial interface and supply voltage?
Yes. Both the ADS7961QDBTRQ1 and ADS7961SDBTRG4 use an 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. The interface timing and register map are common to both variants per the Texas Instruments datasheet.
Which part should be selected for a non-automotive industrial application?
For non-automotive industrial applications operating within -40°C to +85°C, the ADS7961SDBTRG4 is the appropriate choice, as it provides the same 12-bit, 8-channel ADC functionality without the cost premium associated with automotive qualification. The ADS7961QDBTRQ1 should be reserved for designs requiring AEC-Q100 qualification or extended temperature operation.