Texas Instruments TPS38A950122DSKRQ1

Overview

TPS38A950122DSKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive dual-channel overvoltage/undervoltage detector with 65 V input rating, 1 μA typical quiescent current, ±1.5% threshold accuracy (2.7–36 V range), and programmable sense/reset delays via external capacitors. It monitors two independent supply rails in telematics control units and body control modules using separate SENSE1/SENSE2 inputs and delivers reset signals via open-drain or push-pull outputs.

For engineers reviewing the TPS38A950122DSKRQ1 datasheet, TPS38A950122DSKRQ1 pinout, TPS38A950122DSKRQ1 application, or TPS38A950122DSKRQ1 equivalent, this device supports flexible OV/UV detection with 2–13% hysteresis options, manual reset capability on both channels, and 65 V-rated SENSE and RESET pins for direct battery monitoring without external clamping.

Technical Context

The TPS38A950122DSKRQ1 implements dual independent voltage monitoring paths with configurable OV/UV logic per channel, internal reference dividers eliminating external resistor networks, and separate CTSx/CTRx timing pins enabling independent sense and reset delay tuning. Its architecture supports redundant monitoring where SENSE1 and SENSE2 can track voltages higher or lower than VDD.

Each channel features programmable hysteresis (2–13% or fixed 0.5–2.5 V), 10 μs fast fault detection, and output topologies selectable at manufacturing-Channel 1 supports open-drain or push-pull with active-high/low logic, while Channel 2 is open-drain only. The device operates across –40°C to +125°C ambient temperature with functional safety documentation support.

Key Specifications

Pinout & Package

TPS38A950122DSKRQ1 is packaged in a 10-pin WSON (DSK) package measuring 2.5 mm × 2.5 mm with wettable flanks for AOI compatibility. The central thermal pad is non-conductive to meet IEC60664 creepage requirements between VDD and GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel voltage monitoring applications.

Compared with TPS38A950121DSKRQ1 and TPS38A950222DSKRQ1, the TPS38A950122DSKRQ1 uniquely combines 800 mV threshold support, open-drain Channel 1 output, and full 2.7–65 V operating range-making it optimal for designs requiring maximum flexibility in rail selection and reset interface compatibility.

Availability

TPS38A950122DSKRQ1 is available at Aetrix Electronics and suitable for telematics control units, emergency call systems, and head unit and cluster applications requiring stable component supply across extended automotive temperature ranges and long production lifecycles.

Supply support for TPS38A950122DSKRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in automotive-grade IC design and functional safety certification.

The TPS38-Q1 product line delivers high-voltage, ultra-low-quiescent-current voltage supervisors engineered specifically for automotive power rail monitoring, supporting ASIL-B system compliance and robust operation under harsh battery transient conditions.

FAQ

What is the maximum continuous voltage rating for the SENSE pins on the TPS38A950122DSKRQ1?

The SENSE1 and SENSE2 pins on the TPS38A950122DSKRQ1 are rated for continuous operation up to 65 V, matching the VDD absolute maximum rating. This allows direct connection to automotive battery rails without external clamping diodes or Zener protection, provided external circuitry limits voltage to ≤70 V under fault conditions per the absolute maximum ratings table.

Does the TPS38A950122DSKRQ1 support both overvoltage and undervoltage detection on each channel?

Yes, the TPS38A950122DSKRQ1 supports configurable overvoltage (OV) or undervoltage (UV) detection on both SENSE1 and SENSE2 inputs. The detection mode is set at manufacturing via device nomenclature-the "A95" suffix indicates UV detection on both channels, while other variants support mixed or OV-only configurations per TI's device nomenclature guide.

How is the reset time delay programmed on the TPS38A950122DSKRQ1?

The reset time delay for each channel is programmed using external capacitors on CTR1/MR and CTR2/MR pins. With internal resistance of 877–1147 kΩ, a 10 nF capacitor yields ~12.8 ms delay and a 10 μF capacitor yields ~12.8 s delay. Leaving the pin floating selects the shortest internal delay (~100 μs for 2.7–36 V thresholds).

What is the purpose of the non-conductive thermal pad in the TPS38A950122DSKRQ1 WSON package?

The central thermal pad in the TPS38A950122DSKRQ1 DSK package is intentionally non-conductive to increase creepage distance between VDD and GND, satisfying IEC60664 insulation requirements for high-voltage automotive applications. It may be connected to GND or left floating without affecting electrical performance.

Can the TPS38A950122DSKRQ1 monitor supply voltages lower than its VDD supply?

Yes, the TPS38A950122DSKRQ1 supports independent voltage monitoring where SENSE1 or SENSE2 can track rails lower than VDD-for example, monitoring a 3.3 V LDO output while VDD is powered from 12 V. The 800 mV threshold option and high-impedance input enable accurate low-voltage supervision without loading the monitored rail.