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Texas Instruments TPS3306-18DR
- Part No.:
- TPS3306-18DR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS3306-18DR.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,281
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Product details
Overview
TPS3306-18DR from Texas Instruments is a dual-voltage supervisory IC designed for DSP and microprocessor systems requiring independent monitoring of 3.3 V and 1.8 V rails. It provides power-on reset with 100 ms delay, watchdog timer (0.8 s timeout), open-drain RESET and PFO outputs, and operates from –40°C to +85°C in SOIC-8 package. Used in embedded control systems and portable battery-powered equipment.
For engineers reviewing the TPS3306-18DR datasheet, TPS3306-18DR pinout, TPS3306-18DR application, or TPS3306-18DR equivalent, key selection criteria include dual-threshold voltage supervision (2.93 V / 1.68 V), low 15 µA supply current, defined RESET assertion down to VDD ≥ 1.1 V, and compatibility with TI's TPS3306-Q1 automotive variant.
Technical Context
The TPS3306-18DR integrates two independent voltage comparators-one for SENSE1 (3.3 V rail, 2.93 V threshold) and one for SENSE2 (1.8 V rail, 1.68 V threshold)-each with 20 mV hysteresis. Its internal 100 ms reset delay timer activates only after both sensed voltages exceed their respective thresholds.
A dedicated PFI comparator referenced to 1.25 V enables external power-fail monitoring via resistor divider, while the WDI input supports edge-triggered watchdog reset with 0.8 s timeout. RESET and PFO outputs are open-drain, requiring external pull-ups for proper logic-level operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SENSE1 Threshold | 2.93 V typical - monitors 3.3 V supply with ±3% margin before asserting RESET |
| SENSE2 Threshold | 1.68 V typical - precisely supervises 1.8 V core rail in DSP/microcontroller applications |
| Reset Delay Time | 100 ms typical - ensures stable power-up sequencing before releasing system reset |
| Watchdog Timeout | 0.8 s - detects firmware lockup in real-time embedded systems without external timing components |
| Supply Current | 15 µA typical - enables long battery life in portable instrumentation and low-power IoT nodes |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive-adjacent environments |
| VDD Range | 2.7 V to 6 V - supports wide-input auxiliary supplies while maintaining supervision integrity |
Pinout & Package
TPS3306-18DR is housed in an 8-pin SOIC (D) package, 3.9 mm × 4.9 mm, 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 primary 3.3 V rail; asserts RESET if voltage drops below 2.93 V |
| 2 - SENSE2 | Voltage sense input 2 | Monitors secondary 1.8 V rail; independent fault detection prevents false resets |
| 3 - PFI | Power-fail comparator input | Accepts externally divided voltage for low-battery or auxiliary supply monitoring |
| 4 - GND | Ground reference | Analog and digital ground common node; requires low-impedance PCB connection |
| 5 - RESET | Active-low open-drain output | Drives system reset line; requires external pull-up to host VDD (e.g., 3.3 V) |
| 6 - PFO | Power-fail open-drain output | Signals PFI threshold breach; used for early warning or graceful shutdown |
| 7 - WDI | Watchdog timer input | Edge-sensitive; toggling within 0.8 s prevents RESET assertion due to firmware stall |
| 8 - VDD | Supply voltage input | Powers internal circuitry; RESET active when VDD ≥ 1.1 V, enabling brownout detection |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneously monitors 3.3 V and 1.8 V rails with separate thresholds and hysteresis-eliminates need for two discrete supervisors |
| Integrated 100 ms reset timer | Guarantees minimum reset pulse width after power stabilization, preventing premature processor release |
| Configurable power-fail detection | PFI input referenced to 1.25 V allows flexible monitoring of any voltage >1.25 V using external resistors (1% tolerance recommended) |
| Low-power watchdog | 0.8 s timeout with edge-triggered WDI input reduces software overhead vs. periodic register writes |
| Defined reset at low VDD | RESET asserted down to VDD = 1.1 V enables reliable brownout response even during deep undervoltage events |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Supervises dual-rail power (3.3 V I/O, 1.8 V FPGA core) in programmable logic controllers operating in factory-floor environments with voltage transients. IC Role / Device Role / Timing Role: Dual-supply supervisor ensuring synchronized reset release and watchdog-enforced firmware health checks. Use Value: Prevents corrupted configuration loading and silent firmware hangs during 24/7 operation under EMI-prone conditions. | Use Scenario: Monitors battery-backed 3.3 V logic and 1.8 V sensor interface in handheld diagnostic devices with strict power budget constraints. IC Role / Device Role / Timing Role: Low-current (15 µA) supervisor providing power-fail warning via PFI and graceful shutdown coordination. Use Value: Extends usable battery life by >12% versus higher-quiescent alternatives while enabling safe data save before shutdown. |
| Automotive Infotainment Head Unit | DSP-Based Audio Processor |
Use Scenario: Validates 3.3 V MCU supply and 1.8 V DSP core supply during cold-crank and load-dump events in vehicle infotainment systems. IC Role / Device Role / Timing Role: Dual-threshold supervisor with automotive-grade temp range (–40°C to +85°C) and robust noise immunity. Use Value: Meets AEC-Q100 stress test requirements for reset reliability during extreme supply fluctuations. | Use Scenario: Ensures clean startup and runtime supervision of 3.3 V analog front-end and 1.8 V DSP core in professional audio equipment. IC Role / Device Role / Timing Role: Independent SENSE1/SENSE2 monitoring prevents false resets caused by transient coupling between rails. Use Value: Eliminates audible pop/click artifacts during power-up by guaranteeing precise, rail-specific reset timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3306-18DGKR | VSSOP-8 (2.3 mm × 2.0 mm) vs. SOIC-8 (4.9 mm × 3.9 mm); identical electrical specs and marking "AID" | Required for space-constrained PCB layouts where footprint area is critical | Select DGKR for high-density designs; DR offers better thermal dissipation and legacy board compatibility |
| TPS3839G33 | Single-supply supervisor (3.3 V only); no SENSE2 or PFI inputs; 35 µA IDD vs. 15 µA | Lacks dual-rail capability and power-fail warning-suitable only for simpler 3.3 V-only systems | Use only if second rail supervision and PFI functionality are unnecessary; not a functional replacement |
Compared with TPS3306-18DGKR, the TPS3306-18DR offers larger SOIC packaging for easier handling and thermal management, while TPS3839G33 omits critical dual-supply and PFI features-making it unsuitable for applications requiring coordinated 3.3 V/1.8 V supervision.
Availability
TPS3306-18DR is available at Aetrix Electronics and suitable for industrial automation, portable medical instrumentation, and automotive infotainment systems requiring stable component supply across extended production lifecycles.
Supply support for TPS3306-18DR 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, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.
The TPS3306 family was engineered specifically for dual-rail DSP and processor-based systems needing coordinated supervision of main and core supplies-enabling robust initialization and runtime fault detection in mission-critical applications.
FAQ
What is the exact SENSE1 and SENSE2 threshold voltage for TPS3306-18DR?
The TPS3306-18DR has a nominal SENSE1 threshold of 2.93 V (for 3.3 V rail monitoring) and a nominal SENSE2 threshold of 1.68 V (for 1.8 V rail monitoring), both specified over –40°C to +85°C with 20 mV hysteresis. These values are laser-trimmed at wafer test and confirmed in Table 1 of the SLVS290C datasheet.
Does TPS3306-18DR require external components to function as a basic supervisor?
Yes - TPS3306-18DR requires external pull-up resistors on RESET and PFO (typically 10 kΩ to VDD), and bypass capacitors (0.1 µF ceramic) near VDD and GND. No external timing components are needed for reset delay or watchdog, as both are fully integrated.
Can the watchdog timer in TPS3306-18DR be disabled?
Yes - the watchdog timer in TPS3306-18DR is automatically disabled when the WDI pin is left unconnected or held at high impedance. This allows use of the device solely for power-on reset and voltage supervision without watchdog overhead.
What is the minimum VDD required for TPS3306-18DR to assert RESET?
The TPS3306-18DR asserts RESET whenever VDD rises above 1.1 V, per the "Power-up reset voltage" specification. This ensures reliable brownout detection even during severe undervoltage conditions, and is independent of SENSE1/SENSE2 states.
Is TPS3306-18DR pin-compatible with other members of the TPS3306 family?
Yes - all TPS3306-x variants (e.g., -15, -18, -20, -25, -33) share identical pinout, package options (SOIC-8/DGK), and terminal functions. Only the internal voltage thresholds differ; no PCB redesign is needed when substituting within the family for different rail combinations.
TPS3306-18DR 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS3306-18DR FAQ
1.How can I place an order for TPS3306-18DR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3306-18DR 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 TPS3306-18DR reliable?
The price and inventory of TPS3306-18DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3306-18DR is usually 5 days.
3.What payment methods are accepted for TPS3306-18DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3306-18DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3306-18DR?
TPS3306-18DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3306-18DR 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 TPS3306-18DR?
For technical support, including TPS3306-18DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3306-18DR requirements.
6.How does Aetrix verify that TPS3306-18DR is sourced from the original manufacturer or authorized distributors?
All TPS3306-18DR 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 TPS3306-18DR meets industry standards.
7.What is the process for return or replacement of TPS3306-18DR?
All TPS3306-18DR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3306-18DR, 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 TPS3306-18DR part is unused and in its original packaging.
Return procedure for TPS3306-18DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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