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Texas Instruments TPS3306-33DGKR
- Part No.:
- TPS3306-33DGKR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3306-33DGKR.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,111
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Product details
Overview
TPS3306-33DGKR from Texas Instruments is a dual-voltage supervisory IC designed for monitoring 5 V and 3.3 V supply rails in DSP and microprocessor systems. It provides active-low open-drain RESET and PFO outputs, integrated 100 ms power-on reset delay, 0.8 s watchdog timer timeout, 4.55 V/2.93 V sense thresholds, and operates from –40°C to +85°C in VSSOP-8 package.
For engineers reviewing the TPS3306-33DGKR datasheet, TPS3306-33DGKR pinout, TPS3306-33DGKR application, or TPS3306-33DGKR equivalent, key selection criteria include dual-rail voltage supervision accuracy, watchdog retriggering behavior, open-drain output drive capability, low 15 µA supply current, and compatibility with 5 V/3.3 V system architectures requiring reliable power sequencing and fault detection.
Technical Context
The TPS3306-33DGKR integrates two independent voltage comparators with fixed thresholds (4.55 V for SENSE1, 2.93 V for SENSE2), a power-fail comparator referenced to 1.25 V, and a watchdog timer triggered by WDI transitions. RESET remains asserted until both sensed voltages exceed their thresholds and sustain for ≥100 ms.
Its open-drain RESET and PFO outputs support wired-OR configurations and level-shifting across voltage domains. The device asserts RESET when VDD ≥1.1 V and maintains it during undervoltage on either SENSE input or watchdog timeout - enabling robust system initialization and runtime fault recovery in embedded control applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SENSE1 Threshold | 4.55 V (typical); monitors 5 V rail with ±3% tolerance over temperature |
| SENSE2 Threshold | 2.93 V (typical); monitors 3.3 V rail with ±3% tolerance over temperature |
| RESET Delay Time | 100 ms (typical); ensures stable power-up before releasing processor reset |
| Watchdog Timeout | 0.8 s (typical); detects firmware lockup if WDI not toggled within interval |
| Supply Current | 15 µA (typical at 25°C); enables low-power operation in battery-backed systems |
| Operating Temp | –40°C to +85°C; qualified for industrial and automotive-adjacent embedded environments |
| VDD Range | 2.7 V to 6 V; supports wide input supply range while supervising higher rails via resistive dividers |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 0.65 mm lead pitch, 1.1 mm max height, exposed pad optional per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SENSE1 | Voltage monitor input 1 | Connects to 5 V rail (direct or via resistor divider) for primary supply supervision |
| 2: SENSE2 | Voltage monitor input 2 | Connects to 3.3 V rail (direct or via resistor divider) for secondary supply supervision |
| 3: PFI | Power-fail comparator input | Monitors auxiliary voltage (e.g., battery, backup rail) against internal 1.25 V reference |
| 4: GND | Ground reference | Analog/digital common return; requires low-impedance connection to PCB ground plane |
| 5: RESET | Active-low open-drain reset output | Pulls low during fault conditions; requires external pull-up to host VDD (e.g., 3.3 V) |
| 6: PFO | Active-low open-drain power-fail output | Signals auxiliary supply failure independently of main RESET assertion |
| 7: WDI | Watchdog timer input | Edge-triggered (rising/falling); unconnected disables watchdog function |
| 8: VDD | Supply voltage input | Power source for supervisory circuitry; must be ≥1.1 V for RESET activation |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneously monitors 5 V and 3.3 V rails with dedicated thresholds-eliminates need for discrete comparators or external dividers in dual-rail systems |
| Integrated 100 ms reset delay | Guarantees clean release of RESET only after both supplies stabilize-prevents premature processor boot in noisy or slow-ramping power environments |
| Configurable power-fail detection | PFI input referenced to precise 1.25 V internal bandgap allows monitoring of any voltage >1.25 V using two 1% resistors-supports battery low-warning or auxiliary supply fault detection |
| Watchdog timer with edge-triggered WDI | 0.8 s timeout resets on any WDI transition-enables flexible firmware integration without strict timing windows or clock dependencies |
| Low quiescent current | 15 µA typical supply current extends battery life in portable or always-on monitoring applications where continuous supervision is required |
Applications
| Industrial PLC Controller | Automotive Infotainment Head Unit |
|---|---|
Use Scenario: Monitors 5 V main logic supply and 3.3 V MCU core rail in programmable logic controller modules subject to wide-temperature operation and EMI. IC Role / Device Role / Timing Role: Dual-rail supervisor ensuring synchronized reset release and watchdog-based firmware health check during cold start and brownout recovery. Use Value: Prevents corrupted I/O state or register misconfiguration by enforcing minimum 100 ms reset hold time and detecting stalled execution via WDI timeout. | Use Scenario: Supervises 5 V display interface and 3.3 V application processor supply in head units with backup battery monitoring capability. IC Role / Device Role / Timing Role: Primary reset generator with secondary PFI input tied to 12 V battery via resistor network for low-voltage warning prior to shutdown. Use Value: Enables graceful OS suspend and data save before power loss-PFO triggers early warning while RESET manages safe processor halt sequence. |
| Medical Patient Monitor | Network Edge Router |
Use Scenario: Ensures reliable boot and runtime supervision of dual-voltage FPGA and ARM SoC subsystems in Class II medical devices requiring high reliability. IC Role / Device Role / Timing Role: Dual-supply monitor with watchdog guarding real-time data acquisition firmware; RESET output drives FPGA configuration enable and SoC nRST. Use Value: Meets IEC 60601-1 safety requirements through deterministic reset behavior and fail-safe watchdog response-no software-only reset dependency. | Use Scenario: Manages power sequencing and fault detection in multi-rail switch/router line cards with 5 V PHY and 3.3 V packet processor supplies. IC Role / Device Role / Timing Role: Supervises critical rails and feeds WDI from packet processor GPIO to detect stack overflow or interrupt starvation in high-throughput forwarding paths. Use Value: Reduces unplanned downtime by triggering hardware reset before memory corruption or routing table inconsistency occurs-restores service autonomously. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3306-33DR | SOIC-8 package (5.0 mm × 4.0 mm); same electrical specs and pinout as DGK variant | Preferred for through-hole prototyping or legacy board designs with SOIC footprints | Select when PCB layout accommodates larger SOIC footprint and thermal mass is beneficial in high-ambient environments |
| TPS3823-33DBVR | Single 3.3 V supervisor (no SENSE1/PFI); 35 µA supply current; 200 ms reset delay | Lacks dual-rail monitoring and power-fail comparator-suitable only for single-rail 3.3 V systems | Choose only if application requires only 3.3 V supervision and space constraints permit smaller SOT-23-5 package |
Compared with TPS3306-33DR, the TPS3306-33DGKR offers identical functionality in a 3×3 mm VSSOP package for space-constrained designs; compared with TPS3823-33DBVR, it adds critical dual-rail supervision and PFI capability essential for complex multi-voltage systems.
Availability
TPS3306-33DGKR is available at Aetrix Electronics and suitable for industrial control systems, automotive infotainment modules, medical diagnostics equipment, and network infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for TPS3306-33DGKR 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 delivering analog and embedded processing solutions with emphasis on reliability, precision, and energy efficiency across industrial, automotive, and communications markets.
The TPS3306 family is engineered specifically for dual-supply initialization and fault monitoring in DSP and microprocessor-based systems-addressing the need for coordinated reset timing, watchdog safety, and auxiliary voltage supervision in modern embedded platforms.
FAQ
What is the exact SENSE1 and SENSE2 threshold voltage for TPS3306-33DGKR?
The TPS3306-33DGKR has a nominal SENSE1 threshold of 4.55 V and SENSE2 threshold of 2.93 V, both specified at 25°C with ±3% variation over –40°C to +85°C. These values are factory-trimmed and documented in Table 1 of the SLVS290C datasheet. The TPS3306-33DGKR uses these fixed thresholds to supervise 5 V and 3.3 V rails without external resistor networks.
Does TPS3306-33DGKR require external components to supervise 5 V and 3.3 V rails?
No, the TPS3306-33DGKR does not require external resistors to supervise standard 5 V and 3.3 V rails-its internal thresholds (4.55 V and 2.93 V) match those nominal voltages directly. External dividers are only needed if monitoring non-standard voltages via SENSE1 or SENSE2, or when using the PFI input for auxiliary rail supervision.
How is the watchdog timer in TPS3306-33DGKR enabled or disabled?
The watchdog timer in TPS3306-33DGKR is enabled by applying periodic rising or falling edges to the WDI pin; leaving WDI unconnected or held static disables the watchdog. The timeout period is fixed at 0.8 s (typical), and each valid edge resets the internal counter. The TPS3306-33DGKR datasheet specifies that no external components are needed to configure this function.
What is the maximum sink current capability of the RESET and PFO outputs in TPS3306-33DGKR?
The RESET and PFO outputs of the TPS3306-33DGKR are open-drain and rated for 5 mA maximum sink current (IOL) at VO = 0.4 V. This allows direct interfacing with common logic families (e.g., 3.3 V or 5 V microcontrollers) using standard pull-up resistors. The TPS3306-33DGKR maintains this specification across its full operating temperature range.
Is TPS3306-33DGKR compatible with lead-free PCB assembly processes?
Yes, the TPS3306-33DGKR is RoHS-compliant with NiPdAu (NIPDAU) lead finish and MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH), supporting standard lead-free reflow profiles up to 260°C peak. Its VSSOP-8 package meets JEDEC MO-187 standards, and the TPS3306-33DGKR is qualified for industrial temperature operation without derating under IPC-J-STD-020 guidelines.
TPS3306-33DGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
TPS3306-33DGKR FAQ
1.How can I place an order for TPS3306-33DGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3306-33DGKR 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 TPS3306-33DGKR reliable?
The price and inventory of TPS3306-33DGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3306-33DGKR is usually 5 days.
3.What payment methods are accepted for TPS3306-33DGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3306-33DGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3306-33DGKR?
TPS3306-33DGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3306-33DGKR 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 TPS3306-33DGKR?
For technical support, including TPS3306-33DGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3306-33DGKR requirements.
6.How does Aetrix verify that TPS3306-33DGKR is sourced from the original manufacturer or authorized distributors?
All TPS3306-33DGKR 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 TPS3306-33DGKR meets industry standards.
7.What is the process for return or replacement of TPS3306-33DGKR?
All TPS3306-33DGKR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3306-33DGKR, 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 TPS3306-33DGKR part is unused and in its original packaging.
Return procedure for TPS3306-33DGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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