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Texas Instruments TPS3306-18QDRQ1
- Part No.:
- TPS3306-18QDRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS3306-18QDRQ1.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,278
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Product details
Overview
TPS3306-18QDRQ1 from Texas Instruments is an automotive-grade dual supervisory circuit for DSP and processor-based systems, monitoring 3.3 V and 1.8 V supply rails with threshold voltages of 2.93 V and 1.68 V respectively, featuring a 100-ms power-on reset delay, 0.8-s watchdog time-out, and open-drain RESET/PFO outputs. It operates across −40°C to 125°C and draws only 15 µA typical supply current.
For engineers reviewing the TPS3306-18QDRQ1 datasheet, TPS3306-18QDRQ1 pinout, TPS3306-18QDRQ1 application, or TPS3306-18QDRQ1 equivalent, this device supports critical voltage supervision in multivoltage embedded control, automotive ECUs, and battery-powered instrumentation where reliable power sequencing and fail-safe reset behavior are required.
Technical Context
The TPS3306-18QDRQ1 integrates two independent voltage comparators with fixed thresholds (2.93 V on SENSE1, 1.68 V on SENSE2), a 100-ms reset delay timer, and a watchdog circuit triggered by WDI transitions. Its internal 1.25-V reference enables configurable PFI monitoring via external resistors.
All outputs-RESET and PFO-are open-drain with 2-mA/3-mA sink capability at 3.3 V/6 V, and the device asserts RESET whenever either SENSE input falls below its threshold or the watchdog times out. Power-up reset activation begins at VDD ≥ 1.1 V, ensuring early fault detection during brown-in conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 6 V - supports operation across wide-input industrial and automotive supplies including 3.3 V, 5 V, and battery-derived rails. |
| SENSE1 Threshold | 2.93 V (typ) - monitors nominal 3.3 V rail with ~11% undervoltage margin, enabling robust detection of 3.3 V supply collapse. |
| SENSE2 Threshold | 1.68 V (typ) - precisely supervises 1.8 V domain (e.g., core logic or I/O voltage) with ~6.7% headroom before reset assertion. |
| Reset Delay Time | 100 ms (typ) - ensures stable power-up sequencing for processors and DSPs before releasing reset, preventing premature execution. |
| Watchdog Time-Out | 0.8 s (typ) - provides sufficient window for firmware to service watchdog in real-time embedded applications without false triggers. |
| Quiescent Current | 15 µA (typ) - enables long-term battery operation in portable automotive sensors and telematics modules. |
| Operating Temperature | −40°C to 125°C - qualified per AEC-Q100 Grade 1, suitable for under-hood and transmission-control environments. |
Pinout & Package
TPS3306-18QDRQ1 is housed in an SOIC-8 (D package), 3.91 mm × 4.9 mm body, 1.75 mm max height, RoHS-compliant with NIPDAU lead finish and MSL Level-2-260°C-1 year rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SENSE1 | Voltage sense input 1 | Monitors primary supply (e.g., 3.3 V); reset asserted if voltage drops below 2.93 V (typ). |
| 2 - SENSE2 | Voltage sense input 2 | Monitors secondary supply (e.g., 1.8 V); reset asserted if voltage drops below 1.68 V (typ). |
| 3 - PFI | Power-fail comparator input | Accepts externally divided voltage; trips at 1.25 V internal reference for custom low-battery or auxiliary rail monitoring. |
| 4 - GND | Ground reference | Common return path for all internal comparators, timers, and output drivers; requires low-impedance PCB connection. |
| 5 - RESET | Active-low open-drain reset output | Drives low to hold microprocessor/DSP in reset until both SENSE inputs exceed thresholds and 100-ms timer expires. |
| 6 - PFO | Active-low open-drain power-fail output | Signals auxiliary supply failure independently of main reset; enables early warning or graceful shutdown. |
| 7 - WDI | Watchdog timer input | Edge-triggered (rising/falling); must be toggled within 0.8 s to prevent watchdog-induced reset; floating disables function. |
| 8 - VDD | Supply voltage input | Primary power source (2.7–6 V); powers internal circuitry and enables RESET assertion down to VDD = 1.1 V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneously monitors 3.3 V and 1.8 V rails with dedicated thresholds (2.93 V / 1.68 V), eliminating need for discrete supervisors or resistor dividers. |
| Integrated 100-ms reset timer | Guarantees minimum reset pulse width after power stabilization, meeting boot requirements of TI C5000/C6000 DSPs and ARM Cortex-M MCUs. |
| Configurable power-fail detection | PFI input referenced to 1.25 V allows monitoring of any voltage >1.25 V using two 1% resistors, supporting battery voltage tracking or auxiliary supply alerts. |
| Watchdog with 0.8-s timeout | Hardware-enforced software health check prevents lockup in safety-critical automotive functions like motor control or ADAS sensor fusion. |
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to 125°C), PPAP-capable, with production traceability - meets OEM requirements for ECU and body-control modules. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Supervising dual-rail power domains (3.3 V MCU core + 1.8 V image sensor interface) during cold cranking and load-dump transients. IC Role / Device Role / Timing Role: Dual-voltage supervisor providing synchronized reset release and watchdog oversight for real-time control loop integrity. Use Value: Prevents erratic ECU behavior during voltage sag by asserting RESET until both rails stabilize above 2.93 V and 1.68 V, with 100-ms hold time ensuring deterministic boot. |
Use Scenario: Monitoring power integrity for radar SoC and camera ISP in 24 V vehicle architectures with wide input variation. IC Role / Device Role / Timing Role: Independent SENSE1/SENSE2 supervision plus PFI-based battery voltage tracking for predictive low-power mode entry. Use Value: Enables early power-fail warning via PFO to initiate sensor data flush and safe state transition before main supply collapse. |
| Telematics Control Unit (TCU) | Electric Power Steering (EPS) |
|
Use Scenario: Ensuring reliable boot and runtime supervision of LTE modem (3.3 V) and GNSS receiver (1.8 V) in always-connected infotainment gateways. IC Role / Device Role / Timing Role: Dual-supply monitor with watchdog guarding modem firmware execution to prevent communication blackouts. Use Value: 0.8-s watchdog timeout aligns with LTE stack keep-alive intervals, triggering hardware reset if firmware hangs during network reconnection attempts. |
Use Scenario: Validating stability of 3.3 V microcontroller supply and 1.8 V gate-driver bias rail in torque-assist motor controllers exposed to high EMI. IC Role / Device Role / Timing Role: High-immunity voltage supervisor with hysteresis (15–20 mV) rejecting noise-induced false resets during PWM switching events. Use Value: 15 µA quiescent current minimizes standby drain on 12 V battery while maintaining fail-safe reset readiness during vehicle sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3306-18QDQ1 | Same electrical specs and pinout, but in VSSOP-8 (DGK) package - 3.0 mm × 3.0 mm, 1.0 mm height. | Preferred for space-constrained PCBs where SOIC-8 footprint is prohibitive; thermal resistance differs due to smaller package. | Select TPS3306-18QDQ1 when board area is limited and thermal performance permits use of smaller package. |
| TLV809E29DBVR | Single-channel 2.93 V supervisor in SOT-23-3; no SENSE2, no watchdog, no PFI; 1.8 µA IQ. | Only monitors one rail; requires external circuitry for dual-rail or watchdog functionality - increases BOM and layout complexity. | Choose TLV809E29DBVR only for cost-sensitive, single-rail applications where dual supervision is unnecessary. |
Compared with TPS3306-18QDRQ1, the QDQ1 variant offers identical supervision functionality in a smaller footprint but reduced thermal mass, while the TLV809E29DBVR provides minimal single-rail monitoring at lower cost and current - neither matches the integrated dual-rail, watchdog, and PFI capability of the TPS3306-18QDRQ1 in automotive systems.
Availability
TPS3306-18QDRQ1 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS sensor modules, and telematics gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TPS3306-18QDRQ1 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 experience in high-reliability power management and system supervision solutions.
The TPS3306-Q1 product line was designed specifically for automotive DSP and microcontroller systems requiring simultaneous multi-rail voltage monitoring, watchdog protection, and AEC-Q100 compliance - targeting ECU, ADAS, and body electronics applications.
FAQ
What is the exact voltage threshold monitored on SENSE2 for TPS3306-18QDRQ1?
The TPS3306-18QDRQ1 monitors SENSE2 at a nominal threshold of 1.68 V (typical), with guaranteed range of 1.62 V to 1.74 V over −40°C to 125°C. This is factory-trimmed to supervise 1.8 V supply rails with appropriate undervoltage margin, and is distinct from other variants like TPS3306-20QDRQ1 (1.85 V) or TPS3306-25QDRQ1 (2.25 V).
Does TPS3306-18QDRQ1 require external components to function as a basic dual-supply supervisor?
No - TPS3306-18QDRQ1 operates as a complete dual-supply supervisor with no external components required for core functionality. SENSE1 and SENSE2 connect directly to the 3.3 V and 1.8 V rails; RESET and PFO drive open-drain loads with pull-up resistors (typically 10 kΩ). External resistors are only needed if using the PFI input for custom voltage monitoring.
Can the watchdog timer in TPS3306-18QDRQ1 be disabled, and how?
Yes - the watchdog timer in TPS3306-18QDRQ1 is disabled by leaving the WDI pin unconnected (high-impedance). The datasheet confirms that an unconnected or high-Z WDI causes internal retriggering, effectively disabling timeout behavior. Driving WDI continuously high or low also suppresses watchdog action, but floating is the recommended method per TI design guidance.
What is the minimum VDD required to assert RESET in TPS3306-18QDRQ1?
The TPS3306-18QDRQ1 asserts RESET when VDD rises above 1.1 V (guaranteed), enabling early fault detection during power-up or brown-in conditions. This feature ensures reset remains active even before the full 2.7 V minimum operating voltage is reached, improving system robustness during unstable supply conditions.
Is TPS3306-18QDRQ1 pin-compatible with other members of the TPS3306-Q1 family?
Yes - all TPS3306-Q1 variants (e.g., TPS3306-15QDRQ1, TPS3306-20QDRQ1, TPS3306-25QDRQ1) share identical SOIC-8 (D) package, pinout, and electrical interface. Only the SENSE2 threshold differs between variants; SENSE1 threshold (2.93 V) and all other functions (RESET timing, watchdog, PFI) remain consistent across the family.
TPS3306-18QDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.68V, 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 70ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS3306-18QDRQ1 FAQ
1.How can I place an order for TPS3306-18QDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3306-18QDRQ1 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 TPS3306-18QDRQ1 reliable?
The price and inventory of TPS3306-18QDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3306-18QDRQ1 is usually 5 days.
3.What payment methods are accepted for TPS3306-18QDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3306-18QDRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3306-18QDRQ1?
TPS3306-18QDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3306-18QDRQ1 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 TPS3306-18QDRQ1?
For technical support, including TPS3306-18QDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3306-18QDRQ1 requirements.
6.How does Aetrix verify that TPS3306-18QDRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3306-18QDRQ1 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 TPS3306-18QDRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3306-18QDRQ1?
All TPS3306-18QDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3306-18QDRQ1, 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 TPS3306-18QDRQ1 part is unused and in its original packaging.
Return procedure for TPS3306-18QDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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