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Texas Instruments TPS3850G33QDRCRQ1
- Part No.:
- TPS3850G33QDRCRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TPS3850G33QDRCRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10VSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,679
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Product details
Overview
TPS3850G33QDRCRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade precision voltage supervisor with integrated programmable window watchdog timer. It monitors supply rails from 0.9 V to 5.0 V with ±0.8% threshold accuracy over –40°C to +125°C, delivers 10 µA typical supply current, and features open-drain RESET and WDO outputs - used in digital cockpit processing units for reliable microcontroller reset and fault detection.
For engineers reviewing the TPS3850G33QDRCRQ1 datasheet, TPS3850G33QDRCRQ1 pinout, TPS3850G33QDRCRQ1 application, or TPS3850G33QDRCRQ1 equivalent, key selection criteria include its 0.5% hysteresis, factory-programmed ±9.5% reset delay accuracy, user-configurable watchdog window ratios (1/8, 1/2, 3/4), and support for capacitor-programmable timeout ranges from 703 µs to 3.22 s.
Technical Context
The TPS3850G33QDRCRQ1 implements a dual-comparator window architecture on the SENSE pin with independent overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) thresholds, both trimmed to ±0.8% accuracy across temperature. Its internal precision clock drives state-machine-controlled timing for both RESET and watchdog functions.
Watchdog operation uses a configurable window timer where upper (tWDU) and lower (tWDL) boundaries are set via CWD capacitor value and SET0/SET1 logic states - enabling detection of early, late, or missing WDI transitions. RESET assertion is synchronized to SENSE rail entry into/out of the valid window, with tRST delay determined by CRST pin configuration (NC, resistor, or capacitor).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.6 V to 6.5 V - supports wide-input automotive power domains including 3.3 V and 5 V rails. |
| Voltage Threshold Accuracy | ±0.8% max over –40°C to +125°C - ensures reliable reset assertion before MCU SoC supply tolerance limits are violated. |
| Supply Current (IDD) | 10 µA typical - enables low-power always-on monitoring in battery-backed systems. |
| Reset Delay Accuracy | ±9.5% for factory-programmed mode - guarantees deterministic startup sequencing without external timing components. |
| Watchdog Window Ratios | 1/8, 1/2, 3/4 - selectable via SET0/SET1 pins to match software execution timing margins. |
| Hysteresis | 0.5% - suppresses false resets caused by rail noise or slow ramping during power-up/down. |
| Operating Temperature | –40°C to +125°C ambient - qualified per AEC-Q100 Grade 1 for under-hood and infotainment applications. |
Pinout & Package
TPS3850G33QDRCRQ1 is housed in a wettable-flank 3.00-mm × 3.00-mm, 10-pin VSON (DRC) package optimized for automated optical inspection and thermal performance (RθJB = 22.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 1.6–6.5 V; requires 0.1-µF bypass capacitor for noise immunity. |
| GND | Ground reference | Connected internally to exposed thermal pad; must be tied to large-area ground plane. |
| SENSE | Monitored rail input | High-impedance input supporting 0–6.5 V; senses 0.9–5.0 V rails with ±0.8% accuracy. |
| RESET | Open-drain reset output | Asserts low when SENSE exits window; delay (tRST) set by CRST pin configuration. |
| WDO | Open-drain watchdog output | Asserts low only when RESET is high and WDI misses window; enables fault classification. |
| WDI | Watchdog input | Edge-triggered; falling edge must occur between tWDL and tWDU to prevent WDO assertion. |
| CWD | Watchdog timing control | Capacitor-to-GND sets tWDU/tWDL; pullup or NC selects factory presets (e.g., 1.85 ms / 27.5 ms). |
| CRST | Reset timing control | Capacitor-to-GND sets tRST from 703 µs to 3.22 s; NC or 10-kΩ pullup selects factory defaults (10 ms or 200 ms). |
| SET0 / SET1 | Watchdog mode select | Logic inputs selecting window ratio (1/8, 1/2, 3/4) or disabling watchdog; require ≥500 µs setup after change. |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety Documentation Support | Available FIT data, FMEA reports, and safety analysis guidance for ISO 26262 ASIL-B system integration. |
| Programmable Window Watchdog | Configurable tWDL/tWDU boundaries enable precise detection of software hang, premature, or delayed WDI toggles. |
| Factory-Trimmed Precision Timing | ±9.5% tRST and ±10% watchdog timing accuracy eliminate need for calibration in production test. |
| 0.5% Hysteresis on Both Thresholds | Prevents chatter during slow-ramping supplies and improves noise margin in EMI-prone automotive environments. |
| Wettable Flank VSON Package | Enables 100% automated optical inspection (AOI) of solder joints - critical for zero-defect automotive manufacturing. |
Applications
| On-board & Wireless Charger | Digital Cockpit Processing Unit |
|---|---|
Use Scenario: Monitors 12 V DC-DC output and 3.3 V SoC core rail during charging cycles with high dv/dt transients. IC Role / Device Role / Timing Role: Voltage supervisor and window watchdog ensuring safe MCU boot and runtime integrity during thermal throttling events. Use Value: Prevents firmware lockup due to rail instability during dynamic load changes; ±0.8% accuracy avoids false resets at tight SoC supply tolerances. |
Use Scenario: Supervises multi-rail power tree (1.8 V GPU, 1.2 V CPU, 3.3 V I/O) in head-unit SoCs operating at 125°C junction. IC Role / Device Role / Timing Role: Dual-threshold supervisor with independent watchdog per rail domain, coordinated via shared WDI/WDO signaling. Use Value: Enables ASIL-B compliant fail-safe response using dedicated WDO assertion to trigger diagnostic interrupt and graceful shutdown. |
| ADAS Domain Controller | Automotive Telematics Control Unit |
Use Scenario: Validates 5 V camera sensor interface and 1.0 V AI accelerator rail in vision-processing modules with strict startup sequencing. IC Role / Device Role / Timing Role: Precision window comparator with programmable tRST to align reset release with FPGA configuration completion. Use Value: Eliminates race conditions between power-good assertion and peripheral initialization; 0.5% hysteresis rejects ESD-induced glitches. |
Use Scenario: Supervises LTE modem, GNSS receiver, and CAN FD transceiver rails in connected vehicle gateways exposed to cold-crank pulses. IC Role / Device Role / Timing Role: High-immunity supervisor with watchdog disable feature during firmware update to avoid spurious resets. Use Value: Supports safe OTA updates via CRST/SETx pin control; 10 µA IDD extends battery backup runtime during ignition-off monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision and watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3851G33QDRCRQ1 | Includes separate VDD and SENSE supply pins; supports independent 1.6–6.5 V monitoring with no VDD dependency on monitored rail. | Better suited for systems where monitored rail may power down while VDD remains active (e.g., always-on CAN wake-up circuits). | Select TPS3851G33QDRCRQ1 when SENSE rail independence from VDD is required; otherwise TPS3850G33QDRCRQ1 offers lower cost and identical timing accuracy. |
| MAX6373KA29+T | Fixed 2.93 V threshold, no programmable watchdog; ±1.5% accuracy over –40°C to +125°C; 20 µA IDD. | Limited to single-rail monitoring with basic reset-only function; lacks window watchdog and hysteresis adjustability. | Choose MAX6373KA29+T only for cost-sensitive, non-safety-critical applications requiring minimal functionality and no software interaction. |
Compared with TPS3850G33QDRCRQ1, TPS3851G33QDRCRQ1 adds supply rail isolation but increases BOM count, while MAX6373KA29+T sacrifices programmability and accuracy for simplicity - making TPS3850G33QDRCRQ1 optimal for ASIL-B systems needing configurable timing and tight threshold control.
Availability
TPS3850G33QDRCRQ1 is available at Aetrix Electronics and suitable for automotive telematics control units, ADAS domain controllers, and digital cockpit processing units requiring stable component supply across extended product lifecycles.
Supply support for TPS3850G33QDRCRQ1 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 leader specializing in analog, embedded processing, and automotive ICs, with decades of automotive qualification expertise and AEC-Q100 process validation.
The TPS3850-Q1 product line delivers functional-safety-capable voltage supervisors with integrated window watchdogs, designed specifically for ASIL-B automotive subsystems demanding precision, reliability, and diagnostic coverage.
FAQ
What is the operating temperature range for the TPS3850G33QDRCRQ1?
The TPS3850G33QDRCRQ1 is qualified per AEC-Q100 Grade 1 with an ambient operating temperature range of –40°C to +125°C. This rating applies to the full specification set including ±0.8% voltage threshold accuracy, 10 µA typical supply current, and all timing parameters - verified across the entire range with no derating required.
How does the TPS3850G33QDRCRQ1 implement window watchdog functionality?
The TPS3850G33QDRCRQ1 implements window watchdog functionality using two independently programmable time boundaries: tWDL (lower) and tWDU (upper). A falling edge on WDI must occur between them to prevent WDO assertion. Boundaries are set via CWD capacitor value and SET0/SET1 logic states, supporting ratios of 1/8, 1/2, or 3/4 - enabling detection of early, late, or missing watchdog refreshes.
Can the TPS3850G33QDRCRQ1 monitor voltages below 0.9 V?
No, the TPS3850G33QDRCRQ1 is specified for precision monitoring of rails from 0.9 V to 5.0 V. Its internal reference and comparator architecture are trimmed for this range; attempting to monitor sub-0.9 V rails results in degraded accuracy and undefined behavior. For lower-voltage supervision, TI recommends the TPS3850H01Q1 variant with external resistor divider support.
What is the purpose of the wettable flanks on the TPS3850G33QDRCRQ1 VSON package?
The wettable flanks on the TPS3850G33QDRCRQ1's 3-mm × 3-mm VSON package expose solderable metal along the vertical side walls of the package body. This enables automated optical inspection (AOI) systems to verify solder joint quality and coplanarity - a critical requirement for zero-defect automotive manufacturing and IPC-A-610 Class 3 compliance.
Does the TPS3850G33QDRCRQ1 support watchdog disable during firmware updates?
Yes, the TPS3850G33QDRCRQ1 supports watchdog disable via logic states on SET0 and SET1 pins. When SET0 = 1 and SET1 = 0, the watchdog is disabled and WDI is ignored - allowing safe firmware updates without risk of spurious WDO assertion. During disable, RESET functionality remains fully operational for voltage supervision.
TPS3850G33QDRCRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.3V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSON (3x3)
TPS3850G33QDRCRQ1 FAQ
1.How can I place an order for TPS3850G33QDRCRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3850G33QDRCRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS3850G33QDRCRQ1 reliable?
The price and inventory of TPS3850G33QDRCRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3850G33QDRCRQ1 is usually 5 days.
3.What payment methods are accepted for TPS3850G33QDRCRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3850G33QDRCRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3850G33QDRCRQ1?
TPS3850G33QDRCRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3850G33QDRCRQ1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS3850G33QDRCRQ1?
For technical support, including TPS3850G33QDRCRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3850G33QDRCRQ1 requirements.
6.How does Aetrix verify that TPS3850G33QDRCRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3850G33QDRCRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS3850G33QDRCRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3850G33QDRCRQ1?
All TPS3850G33QDRCRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3850G33QDRCRQ1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS3850G33QDRCRQ1 part is unused and in its original packaging.
Return procedure for TPS3850G33QDRCRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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