TPS3850G30QDRCRQ1 - 3.3V Window Supervisor w/ Watchdog Q1 | TI
MPN: TPS3850G30QDRCRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.1 | $2.10 |
| 10 | $1.88 | $18.80 |
| 100 | $1.62 | $162.00 |
| 500 | $1.4 | $700.00 |
| 1,000 | $1.18 | $1,180.00 |
TPS3850G30QDRCRQ1 Overview
A window voltage supervisor is a power-rail monitoring IC that asserts a reset whenever the monitored supply falls outside a programmable overvoltage/undervoltage window, distinct from a simple single-threshold supervisor. Within the broader system hierarchy, the TPS3850G30QDRCRQ1 belongs to the supervisor and reset IC family, sitting under power management ICs in safety-critical electronics. It pairs an internal precision bandgap reference with a window comparator and a window watchdog timer (WDT), supporting the functional-safety demands of ISO 26262 ASIL-rated automotive ECUs.
Key features include a single-channel open-drain reset output, programmable watchdog timeout via an external capacitor on the WT pin, programmable reset delay via an external capacitor on the DLY pin, integrated immunity to short transients on the SENSE line, and active-low watchdog input (WDI). The 10-VSON DR package's 3 mm x 3 mm footprint plus exposed thermal pad simplifies PCB layout in dense ECU designs and minimizes board area versus comparable SOT-23-style supervisors.
The architecture uses a precision bandgap reference feeding two comparators that window the SENSE pin against VIT+ (OV) and VIT- (UV) thresholds, while an independent RC-controlled timer block creates the watchdog window for the WDT input. Auto-grade AEC-Q100 qualification and 0.8% threshold accuracy allow it to directly monitor tight-tolerance rails such as 3.3 V microcontrollers, CAN transceivers, and SoC core rails, where any supply excursion outside the safe window must trigger a deterministic reset rather than rely solely on internal MCU monitors.
Typical applications include automotive ECU power supervision, ADAS controller rails, body and chassis modules, industrial PLC safety outputs, and redundant power-rail monitoring. The AEC-Q100 qualification also extends to electric-vehicle battery-management controllers where the supervisor must operate reliably across wide cold-crank and load-dump transients.
When designing with this device, place the WT capacitor and the DLY capacitor as close as practical to their respective pins to avoid leakage paths that would shift timing accuracy. A 0.1 uF decoupling capacitor on VDD, plus a 1 M ohm resistor divider where adjustable thresholds are needed, is recommended for high-noise automotive environments.
This page synthesizes AEC-Q100 status, drop-in watchdog supervisor alternatives, and practical automotive layout notes not found in the original TPS3850-Q1 datasheet alone.
Drop-in alternatives for TPS3850G30QDRCRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesTPS3850G30QDRCRQ1 Specifications
| Part Number | TPS3850G30QDRCRQ1 |
| Topology | Precision window voltage supervisor with programmable window watchdog timer |
| Output Type | Open-Drain or Open-Collector (1 channel) |
| Nominal Sense Threshold (G30 variant) | 3.3 V |
| Threshold Accuracy | 0.8% over -40 C to +125 C |
| Hysteresis | Integrated on both OV and UV thresholds |
| Number of Channels Monitored | 1 |
| Reset Output Polarity | Active Low |
| Watchdog Input | WDI with programmable window via external capacitor on WT |
| Watchdog Timeout | Programmable (set by CWDT external capacitor) |
| Reset Delay | Programmable (set by CDLY external capacitor) |
| Operating Temperature Range | -40 C to +125 C (automotive Grade 1) |
| Package | 10-VSON (DRC) 3 mm x 3 mm |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 Grade 1 |
| RoHS Status | Compliant |
| Lead Free | Yes |
| Packing | Tape & Reel, 3000-piece reel (suffix Q1 = auto grade) |
TPS3850G30QDRCRQ1 Pin Configuration
| Pin 1 | RESET — Active-low open-drain reset output (asserts when SENSE outside window or watchdog fault) |
| Pin 2 | GND — Ground reference |
| Pin 3 | WDI — Watchdog input - host MCU toggles to indicate CPU execution |
| Pin 4 | WT — Watchdog timing capacitor (sets watchdog window) |
| Pin 5 | DLY — Reset delay capacitor (sets RESET release delay) |
| Pin 6 | NC — Not connected (per datasheet) |
| Pin 7 | VDD — Supply input for the IC (decouple with 0.1 uF) |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | SENSE — Voltage monitor input (3.3 V nominal for G30 variant) |
| Pin 10 | PAD — Exposed thermal pad - connect to GND for thermal dissipation |
Typical Applications
TPS3850G30QDRCRQ1 is suitable for 6 applications: Automotive ECU Power Supervision, ADAS Camera/Sensor Power-Rail Monitor, Body and Chassis Module Reset Controller, Industrial PLC Safety Output Supervision, Electric Vehicle Battery Management (BMS) MCU Supervisor, Redundant Dual-Supervisor Safety Logic.
Automotive ECU Power Supervision
The TPS3850G30QDRCRQ1's 0.8% voltage-monitor accuracy over -40 C to +125 C plus AEC-Q100 Grade 1 qualification make it ideal as the primary reset supervisor for an automotive ECU's 3.3 V microcontroller rail. The internal window comparator asserts RESET if the supply drifts outside the OV/UV thresholds during cold-crank, load-dump, or cranking-limp-mode transients that the upstream LDO cannot reject. The integrated window watchdog timer (programmable via an external WT capacitor) adds an independent CPU-execution monitor outside the MCU's internal WDT, satisfying ISO 26262 ASIL-B DCD fault-detection coverage. Place the 10-VSON DRC within 5 mm of the MCU's RESET pin with a 0.1 uF decoupling capacitor on VDD.
Recommended
ADAS Camera/Sensor Power-Rail Monitor
The TPS3850G30QDRCRQ1 fits ADAS front-camera or radar-sensor modules where the 3.3 V logic rail must stay inside a tight tolerance window and the host MCU must be reset deterministically on any supply excursion. Its 0.8% threshold accuracy suppresses false resets caused by sensor-induced load transients, while the open-drain RESET allows wired-OR reset arbiter across two TPS3850 devices for redundant safety logic. The AEC-Q100 Grade 1 rating also handles underhood ambient conditions around sensor housings. Connect the SENSE pin directly to the 3.3 V LDO output and use a 1 M ohm input resistor divider if the rail is pre-scaled.
Recommended
Body and Chassis Module Reset Controller
Body-control modules and door-zone controllers typically run from a 3.3 V rail sourced from an automotive-grade LDO and need a tiny supervisor that can flag both brownout conditions and a frozen MCU. The TPS3850G30QDRCRQ1 combines both functions in a 3 mm x 3 mm VSON footprint that fits behind a connector shroud. Its programmable window watchdog timer detects MCU code hang within a configurable WDT window, and the integrated hysteresis on both OV and UV thresholds prevents RESET chatter near the supply rail boundary during long ignition-crank events.
Recommended
Industrial PLC Safety Output Supervision
Industrial PLC safety relays and IEC 61508 SIL-rated I/O modules leverage the TPS3850G30QDRCRQ1's window supervisor plus windowed watchdog capability in the same way automotive ECUs do. The 0.8% threshold accuracy gives stable reset behavior across a 24 V-to-3.3 V down-converter's output even with large step loads from relay switching. The wide operating-temperature envelope allows placement near machine cabinets without derating, while the small 10-VSON DRC keeps the safety-zone footprint minimal.
Recommended
Electric Vehicle Battery Management (BMS) MCU Supervisor
The TPS3850G30QDRCRQ1 is well-suited to BMS microcontroller rails that must operate reliably across the full EV cold-crank to load-dump range, including sub-zero pack temperatures. The device's AEC-Q100 Grade 1 rating (-40 C to +125 C) and 0.8% accuracy enforce deterministic reset behavior on the BMS MCU when the 3.3 V LDO output dips or overshoots during contactor switching events. The windowed watchdog also flags a stack-monitoring MCU that has stopped servicing the cell-sense firmware within the WDT window, complementing the BMS's internal self-tests.
Recommended
Redundant Dual-Supervisor Safety Logic
For ISO 26262 ASIL-D-class systems that require two independent reset paths, two TPS3850G30QDRCRQ1 devices can monitor the same 3.3 V rail with their open-drain RESET outputs wired-OR'd and routed to the MCU's reset pin. The 10-VSON's small footprint enables high-density placement on dual-supervisor ECUs without consuming the connector-zone area. The window watchdog timer plus OV/UV monitor in one IC reduces the bill-of-materials versus separate supervisor and watchdog ICs, and AEC-Q100 Grade 1 qualification simplifies the FMEDA.
Recommended
Recommended Products Summary
Engineering reference data for TPS3850G30QDRCRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS3850H30QDRCRQ1 | TPS3850G33QDRCRQ1 | TPS3850G25QDRCRQ1 | TPS3850G18QDRCRQ1 |
|---|---|---|---|---|---|
| Package | 10-VSON (DRC) 3x3 mm | 10-VSON (DRC) 3x3 mm - same | 10-VSON (DRC) 3x3 mm - same | 10-VSON (DRC) 3x3 mm - same | 10-VSON (DRC) 3x3 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Topology | Window OV/UV supervisor + programmable WDT | Window OV/UV supervisor + programmable WDT | Window OV/UV supervisor + programmable WDT | Window OV/UV supervisor + programmable WDT | Window OV/UV supervisor + programmable WDT |
| Threshold Accuracy | 0.8% over -40 C to +125 C | 0.8% over -40 C to +125 C | 0.8% over -40 C to +125 C | 0.8% over -40 C to +125 C | 0.8% over -40 C to +125 C |
| Watchdog Timer | Programmable window WDT (CWDT) | Programmable window WDT (CWDT) | Programmable window WDT (CWDT) | Programmable window WDT (CWDT) | Programmable window WDT (CWDT) |
| Automotive Qualification | AEC-Q100 Grade 1 | AEC-Q100 Grade 1 | AEC-Q100 Grade 1 | AEC-Q100 Grade 1 | AEC-Q100 Grade 1 |
| Reset Output | Active-low open-drain | Active-low open-drain | Active-low open-drain | Active-low open-drain | Active-low open-drain |
Key Differentiators
- Single-IC window supervisor plus windowed watchdog (vs TPS3808G33QDBVRQ1)
- Highest 0.8% threshold accuracy over the full automotive range (vs Generic competitors)
- AEC-Q100 Grade 1 qualified with same-footprint second sources (vs TPS3850H30QDRCRQ1 / TPS3850G33QDRCRQ1)
Design Notes
Place the TPS3850G30QDRCRQ1 within 5 mm of the MCU's RESET pin and tie the RESET pull-up to the same VDD rail being supervised. Use a 0.1 uF X7R ceramic capacitor on VDD with a 10 ohm ferrite bead, and place the capacitor as close to the DRC pin as the layout allows. The exposed thermal pad must be soldered to a 4 mm x 4 mm GND copper pour for thermal dissipation. Decouple noisy high-current loads with a bulk capacitor (>=10 uF) ahead of the supervisor branch.
Do not connect the SENSE input directly to a high-current bus without an input resistor divider or series resistor, otherwise load transients may inject voltage spikes beyond the absolute-maximum rating of the SENSE pin. Verify that the WT and DLY capacitor values stay inside the datasheet's allowed range (typically 100 pF to 1 uF) - below 100 pF, leakage dominates timing accuracy. When using the watchdog feature, always service WDI with a valid toggle within the programmed window or the RESET output asserts unexpectedly during normal startup.
Keep SENSE traces short and routed away from switching-node traces, ideally over a continuous GND pour, to prevent capacitive coupling from distorting the monitored voltage. The SENSE pin has a high-impedance input so even small PCB leakage paths (residues, solder flux) can shift the apparent monitored voltage. Use guard rings or a coplanar waveguide pattern around the SENSE trace if the ECU operates in a humid underhood environment.
Estimated: at VDD = 5 V and the TPS3850G30's typical quiescent current of ~10 uA, the supervisor adds only ~50 uW of dissipation - well within the 10-VSON DRC's 100 mW continuous rating. In battery-powered standby scenarios, the leakage through the RESET pull-up resistor dominates, so use a 100 kohm pull-up rather than a 10 kohm to keep standby drain low.
Compliance Information
AEC-Q100 Grade 1 qualified per TI's TPS3850-Q1 product page. RoHS and lead-free confirmed by distributor listings. Halogen-free status not explicitly stated in the verified web data.
