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Texas Instruments TPS3306-33QDRQ1
- Part No.:
- TPS3306-33QDRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS3306-33QDRQ1.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,615
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Product details
Overview
TPS3306-33QDRQ1 from Texas Instruments is an automotive-grade dual supervisory circuit designed for monitoring 5 V and 3.3 V supply rails in DSP and processor-based systems. It provides power-on reset with 100-ms delay, watchdog timer with 0.8-s timeout, open-drain RESET and PFO outputs, and operates across −40°C to 125°C.
For engineers reviewing the TPS3306-33QDRQ1 datasheet, TPS3306-33QDRQ1 pinout, TPS3306-33QDRQ1 application, or TPS3306-33QDRQ1 equivalent, key selection criteria include dual-voltage threshold accuracy (4.55 V / 2.93 V), ultra-low 15 µA supply current, AEC-Q100 qualification, and integrated power-fail comparator functionality.
Technical Context
The TPS3306-33QDRQ1 integrates two independent voltage supervisors with fixed thresholds of 4.55 V (SENSE1) and 2.93 V (SENSE2), each with 30 mV hysteresis. Its internal 100-ms reset delay timer activates only after both sensed voltages exceed their respective thresholds.
A dedicated watchdog circuit monitors WDI transitions with 0.8-s timeout and reinitializes on reset assertion; the PFI comparator references a precise 1.25 V internal reference and supports external resistor-based voltage supervision down to 1.25 V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 6 V - supports wide-input operation including 3.3 V, 5 V, and battery-backed systems. |
| SENSE1 Threshold (VIT1) | 4.55 V (typ) - monitors 5 V rail with ±3% tolerance over temperature, enabling reliable brownout detection. |
| SENSE2 Threshold (VIT2) | 2.93 V (typ) - supervises 3.3 V domain with 30 mV hysteresis to prevent chatter during marginal conditions. |
| Reset Delay Time (td) | 100 ms (typ) - ensures stable system initialization after both supplies reach valid levels. |
| Watchdog Timeout (tt(out)) | 0.8 s (typ) - provides robust software execution monitoring without requiring high-frequency servicing. |
| Supply Current (IDD) | 15 µA (typ) - enables long battery life in portable and automotive always-on subsystems. |
| Operating Temperature | −40°C to 125°C - qualified per AEC-Q100 Grade 1 for under-hood and infotainment applications. |
Pinout & Package
TPS3306-33QDRQ1 is housed in an industry-standard SOIC-8 (D package), 3.91 mm × 4.90 mm body, 1.75 mm max height, RoHS-compliant with NIPDAU lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SENSE1 | Voltage sense input 1 | Monitors 5 V rail; asserts RESET if voltage drops below 4.55 V (typ) with 30 mV hysteresis. |
| 2: SENSE2 | Voltage sense input 2 | Monitors 3.3 V rail; triggers combined reset condition when below 2.93 V (typ). |
| 3: PFI | Power-fail comparator input | Accepts external voltage divider output; compares against 1.25 V reference for auxiliary supply monitoring. |
| 4: GND | Ground reference | Common return path for all internal circuits and output drivers; requires low-impedance PCB connection. |
| 5: RESET | Active-low open-drain reset output | Drives low during power-up, brownout, or watchdog timeout; requires external pull-up for logic-level compatibility. |
| 6: PFO | Active-low open-drain power-fail output | Signals auxiliary supply failure independently of main reset; supports low-battery warning or backup switchover. |
| 7: WDI | Watchdog timer input | Edge-triggered (rising/falling); resets internal 0.8-s timer; floating disables watchdog function. |
| 8: VDD | Supply voltage input | Power source for internal circuitry; RESET becomes defined at ≥1.1 V, enabling early fault detection. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneously monitors 5 V and 3.3 V rails with dedicated thresholds and hysteresis-eliminates need for discrete comparators or multiple ICs. |
| Integrated watchdog timer | 0.8-s timeout with edge-sensitive WDI input-ensures deterministic recovery from firmware hangs without external timing components. |
| Power-fail comparator with PFO | 1.25 V internal reference enables flexible supervision of any voltage ≥1.25 V via external resistive divider-supports battery voltage monitoring or auxiliary supply tracking. |
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to 125°C) and PPAP-capable-meets functional safety requirements for ASIL-B–compatible system monitoring. |
| Ultra-low quiescent current | 15 µA typical supply current-reduces standby power in always-on automotive modules such as telematics and gateway ECUs. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Monitors primary 5 V microcontroller supply and secondary 3.3 V sensor interface rail during cold cranking and load dump events. IC Role / Device Role / Timing Role: Dual-supply supervisor ensuring synchronized reset assertion and watchdog enforcement for real-time control integrity. Use Value: Prevents ECU lockup during transient voltage dips by asserting RESET before MCU enters undefined state, with 100-ms delay guaranteeing stable clock acquisition. |
Use Scenario: Supervises vision processor core (3.3 V) and I/O (5 V) rails while using PFI to monitor camera module battery voltage. IC Role / Device Role / Timing Role: Fault-detection hub providing independent reset, power-fail warning, and software execution monitoring in safety-critical imaging subsystems. Use Value: Enables graceful camera shutdown and error logging upon detected low-battery condition via PFO, avoiding image corruption or frame loss. |
| Infotainment Head Unit | Body Control Module (BCM) |
|
Use Scenario: Ensures clean boot sequence for multi-rail SoC powering display, audio, and connectivity subsystems in automotive infotainment. IC Role / Device Role / Timing Role: Power-on reset generator with dual-threshold supervision and watchdog oversight of application processor firmware. Use Value: Eliminates boot failures caused by asynchronous rail ramp-up; 0.8-s watchdog timeout catches stalled GUI threads without adding MCU overhead. |
Use Scenario: Manages power sequencing and fault response for door module MCU (3.3 V) and LIN transceiver (5 V) in distributed body electronics. IC Role / Device Role / Timing Role: System-level health monitor combining voltage supervision, power-fail alerting, and software watchdog in compact footprint. Use Value: Reduces BOM count by consolidating three supervision functions into single SOIC-8 device, lowering PCB area and assembly cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3307-33QDGNRQ1 | Same dual-supervision architecture but uses adjustable SENSE2 threshold via external resistor; fixed SENSE1 = 4.55 V. | Requires external resistor network for 3.3 V monitoring; less suitable for space-constrained designs needing fixed-threshold simplicity. | Select when fine-tuning SENSE2 threshold beyond 2.93 V is required, e.g., for 3.3 V ±5% tolerance compliance. |
| TLV809E33DBVRQ1 | Single-channel 3.3 V supervisor only; no SENSE1, PFI, or watchdog; 1.6 µA IDD; SOT-23-3 package. | Lacks dual-rail capability, power-fail monitoring, and watchdog-requires additional ICs to match TPS3306-33QDRQ1 functionality. | Choose only for minimal-cost, single-rail monitoring where watchdog and auxiliary supervision are unnecessary. |
Compared with TPS3306-33QDRQ1, TPS3307-33QDGNRQ1 offers design flexibility at the cost of component count and layout area, while TLV809E33DBVRQ1 reduces quiescent current but sacrifices integration-making TPS3306-33QDRQ1 optimal for space- and feature-constrained automotive systems requiring full supervision coverage.
Availability
TPS3306-33QDRQ1 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and infotainment head units requiring stable component supply with AEC-Q100 compliance and long-term production support.
Supply support for TPS3306-33QDRQ1 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 electronics, with decades of experience in high-reliability power management and system monitoring solutions.
The TPS3306-Q1 product line was engineered specifically for automotive applications demanding dual-supply supervision, watchdog safety enforcement, and extended temperature operation-targeting ECU, ADAS, and body electronics markets.
FAQ
What is the exact voltage threshold monitored by SENSE1 on the TPS3306-33QDRQ1?
The TPS3306-33QDRQ1 monitors SENSE1 at a nominal threshold of 4.55 V (typical), with guaranteed range of 4.44 V to 4.68 V across −40°C to 125°C. This threshold is factory-trimmed and fixed for the -33 variant, designed specifically to supervise a 5 V supply rail with 30 mV hysteresis to prevent oscillation during marginal conditions.
Does the TPS3306-33QDRQ1 require external components to operate as a basic dual-supervisor?
No, the TPS3306-33QDRQ1 operates as a complete dual-supervisory circuit with no mandatory external components. Only pull-up resistors on RESET and PFO (open-drain outputs) and optional RC filtering on SENSE inputs are recommended for noise immunity. The watchdog timer is disabled by default unless WDI is actively toggled, and PFI can be left unconnected if unused.
How does the watchdog timer in the TPS3306-33QDRQ1 interact with the reset function?
When the watchdog timer times out (after 0.8 s of no WDI transition), it forces the RESET output active-low for the full 100-ms delay period-identical to power-on or brownout reset behavior. This ensures hardware-level recovery regardless of software state. The watchdog is fully independent of voltage monitoring: RESET asserts even if both SENSE1 and SENSE2 remain above threshold.
Can the TPS3306-33QDRQ1 supervise voltages other than 5 V and 3.3 V?
Yes-the PFI input accepts externally divided voltages referenced to the internal 1.25 V comparator threshold, enabling supervision of any voltage ≥1.25 V (e.g., 12 V battery via 10:1 divider). However, SENSE1 and SENSE2 thresholds are fixed at 4.55 V and 2.93 V respectively; alternate variants like TPS3306-18QDRQ1 are required for different nominal rail supervision.
Is the TPS3306-33QDRQ1 pin-compatible with other members of the TPS3306-Q1 family?
Yes, all TPS3306-Q1 variants-including TPS3306-15QDRQ1, TPS3306-18QDRQ1, and TPS3306-25QDRQ1-share identical SOIC-8 (D) package, pinout, and terminal functions. Only the internal voltage thresholds differ; this allows drop-in replacement across variants when adjusting supervised rail combinations, provided PCB layout accommodates the same 8-pin SOIC footprint.
TPS3306-33QDRQ1 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:
- 2.93V, 4.55V
- 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
TPS3306-33QDRQ1 FAQ
1.How can I place an order for TPS3306-33QDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3306-33QDRQ1 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 TPS3306-33QDRQ1 reliable?
The price and inventory of TPS3306-33QDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3306-33QDRQ1 is usually 5 days.
3.What payment methods are accepted for TPS3306-33QDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3306-33QDRQ1 transactions.
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4.How is shipping managed for TPS3306-33QDRQ1?
TPS3306-33QDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3306-33QDRQ1 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 TPS3306-33QDRQ1?
For technical support, including TPS3306-33QDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3306-33QDRQ1 requirements.
6.How does Aetrix verify that TPS3306-33QDRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3306-33QDRQ1 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 TPS3306-33QDRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3306-33QDRQ1?
All TPS3306-33QDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3306-33QDRQ1, 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 TPS3306-33QDRQ1 part is unused and in its original packaging.
Return procedure for TPS3306-33QDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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