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Texas Instruments TPS3306-20D
- Part No.:
- TPS3306-20D
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS3306-20D.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,074
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Product details
Overview
TPS3306-20D from Texas Instruments is a dual-voltage supervisory IC designed for DSP and processor-based systems requiring independent monitoring of 3.3 V and 2.0 V supply rails. 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 +85°C in SOIC-8 package.
For engineers reviewing the TPS3306-20D datasheet, TPS3306-20D pinout, TPS3306-20D application, or TPS3306-20D equivalent, this page delivers verified specifications, terminal functions, real-world use cases in embedded control and automotive systems, and validated alternative options for voltage supervision design.
Technical Context
The TPS3306-20D integrates two independent voltage comparators (SENSE1/SENSE2) with fixed thresholds - 2.93 V (typ) for 3.3 V rail and 1.85 V (typ) for 2.0 V rail - plus hysteresis (15–20 mV). Its internal 100 ms reset delay timer activates only after both SENSE inputs exceed their respective VIT levels.
A dedicated PFI comparator referenced to 1.25 V enables external power-fail detection via resistor divider, while the WDI input supports edge-triggered watchdog reset with 0.8 s timeout; leaving WDI unconnected disables the watchdog function entirely.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SENSE1 threshold | 2.93 V (typ), monitors 3.3 V supply with ±3% tolerance over temperature |
| SENSE2 threshold | 1.85 V (typ), monitors 2.0 V supply with ±3% tolerance over temperature |
| RESET delay time | 100 ms (typ), ensures reliable system initialization after valid supply conditions |
| Watchdog timeout | 0.8 s (typ), detects software lockup in microcontroller/DSP applications |
| Supply current | 15 µA (typ), enables low-power operation in battery-backed systems |
| Operating temp | –40°C to +85°C, qualified for industrial and automotive environments |
| VDD range | 2.7 V to 6 V, supports wide input supply for flexibility in mixed-rail designs |
Pinout & Package
TPS3306-20D 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 |
|---|---|---|
| SENSE1 (Pin 1) | Voltage sense input 1 | Monitors primary 3.3 V rail; asserts RESET if voltage drops below 2.93 V |
| SENSE2 (Pin 2) | Voltage sense input 2 | Monitors secondary 2.0 V rail; contributes to RESET assertion when below 1.85 V |
| PFI (Pin 3) | Power-fail comparator input | Accepts external voltage divider for custom power-fail detection (reference = 1.25 V) |
| GND (Pin 4) | Ground reference | Common return path for all internal circuits and output drivers |
| RESET (Pin 5) | Active-low reset output | Open-drain output asserted low during power-up, brownout, or watchdog timeout |
| PFO (Pin 6) | Power-fail output | Open-drain output driven low when PFI falls below 1.25 V threshold |
| WDI (Pin 7) | Watchdog timer input | Edge-sensitive input; toggling within 0.8 s prevents RESET assertion |
| VDD (Pin 8) | Supply voltage input | Primary power source (2.7–6 V); RESET defined down to VDD ≥ 1.1 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneously monitors 3.3 V and 2.0 V rails with dedicated thresholds and hysteresis |
| Integrated 100 ms reset delay timer | Eliminates need for external RC timing network; guarantees clean system boot |
| Configurable power-fail detection | PFI/PFO pair allows user-defined trip point using external resistors (e.g., for 5 V or 12 V monitoring) |
| Watchdog with programmable enable | WDI pin can be left floating to disable watchdog-no external pull-up required |
| Low quiescent current | 15 µA typical supply draw extends battery life in portable and backup systems |
Applications
| Industrial PLC Controller | Automotive Infotainment Module |
|---|---|
Use Scenario: Monitors dual-core DSP supply rails (3.3 V I/O, 2.0 V core) during cold cranking where battery dips to 6 V. IC Role / Device Role / Timing Role: Dual-supply supervisor ensuring synchronized reset release only after both rails stabilize above thresholds. Use Value: Prevents partial initialization and firmware corruption by enforcing strict dual-rail qualification before releasing RESET. | Use Scenario: Detects early power-fail condition in head-unit main 5 V supply using PFI resistor divider while supervising 3.3 V/2.0 V logic rails. IC Role / Device Role / Timing Role: Combines rail supervision and auxiliary power-fail warning in single SOIC-8 footprint. Use Value: Enables graceful shutdown of audio buffers and nonvolatile memory writes before main supply collapse. |
| Medical Patient Monitor | Network Edge Router |
Use Scenario: Supervises isolated 3.3 V analog front-end and 2.0 V ADC reference supplies in battery-operated portable monitor. IC Role / Device Role / Timing Role: Low-current (15 µA) supervisor maintaining long standby time while guaranteeing safe boot on recharge. Use Value: Extends clinical device runtime without compromising reset reliability or safety-critical initialization sequence. | Use Scenario: Watches CPU execution flow via WDI while monitoring 3.3 V management rail and 2.0 V PHY supply in fanless router design. IC Role / Device Role / Timing Role: Dual supervisor + watchdog co-located with processor to minimize trace length and noise coupling. Use Value: Reduces BOM count by consolidating three functions (dual rail monitor + watchdog + PFI) into one IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3306-20DGK | VSSOP-8 (2.3 mm × 2.0 mm), same electrical specs, lower profile (1.1 mm max height) | Better suited for space-constrained PCBs; requires different land pattern and stencil design | Select DGK for high-density layouts; verify thermal derating (220 mW vs D's 377 mW at 85°C) |
| TPS3823-25DBVR | Single-supply supervisor (2.5 V threshold), no SENSE2 or PFI; SOT-23-5 package | Lacks dual-rail capability and power-fail detection; only monitors one rail | Use only if system has single critical rail and board area is severely limited |
Compared with TPS3306-20DGK, the TPS3306-20D offers higher power dissipation margin and simpler assembly; compared with TPS3823-25DBVR, it delivers full dual-rail supervision and PFI functionality essential for complex DSP systems.
Availability
TPS3306-20D is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive infotainment modules, and medical patient monitors requiring stable component supply with guaranteed long-term availability.
Supply support for TPS3306-20D 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 for industrial, automotive, and communications markets.
The TPS3306 family targets DSP and processor-based systems needing dual independent supply monitoring, power-fail warning, and watchdog protection - optimized for reliability in harsh operating environments.
FAQ
What is the exact SENSE2 threshold voltage for TPS3306-20D?
The TPS3306-20D has a nominal SENSE2 threshold of 1.85 V (typical), with min/max values of 1.81 V and 1.89 V over the full temperature range (–40°C to +85°C). This threshold is factory-trimmed and applies specifically to the TPS3306-20D variant, not other members of the TPS3306 family. The TPS3306-20D uses this fixed threshold to supervise a 2.0 V supply rail with ±2% accuracy under recommended operating conditions.
Can TPS3306-20D monitor a 5 V supply on SENSE1?
No - the TPS3306-20D is factory-configured for 3.3 V/2.0 V supervision: SENSE1 threshold is fixed at 2.93 V (typ), not adjustable. For 5 V monitoring, use TPS3306-33 (SENSE1 = 4.55 V) or implement external resistor scaling on PFI. The TPS3306-20D datasheet explicitly defines its SENSE1 threshold as 2.93 V, and applying 5 V directly exceeds the absolute maximum input voltage limit of (VDD + 0.3 V) on SENSE pins.
Does TPS3306-20D require external components to operate?
The TPS3306-20D operates autonomously with only VDD and GND connections; no external capacitors or resistors are required for basic dual-rail supervision. However, a 0.1 µF ceramic bypass capacitor is recommended near VDD/GND per TI guidelines. External resistors are needed only if using PFI for custom power-fail detection. The TPS3306-20D integrates all timing, reference, and logic functions internally - including the 100 ms reset delay and 0.8 s watchdog timer.
Is the watchdog timer in TPS3306-20D enabled by default?
No - the watchdog timer in TPS3306-20D is disabled by default and requires active toggling of the WDI pin to remain armed. If WDI is left unconnected (high-impedance), the internal watchdog circuit is disabled and will not assert RESET due to timeout. To enable it, the host processor must generate a rising or falling edge on WDI at least once every 0.8 s. The TPS3306-20D behavior is explicitly documented in the datasheet: "Leaving WDI unconnected disables the watchdog."
What package options are available for TPS3306-20D?
The TPS3306-20D is offered exclusively in the SOIC-8 (D) package: 3.9 mm × 4.9 mm body, 1.75 mm max height, with 1.27 mm lead pitch. It is not available in VSSOP (DGK) or tape-and-reel variants bearing the "D" suffix - those are separate orderable part numbers (e.g., TPS3306-20DGKR). The TPS3306-20D ships in tubes of 75 units and is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
TPS3306-20D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.85V, 2.92V
- 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
TPS3306-20D FAQ
1.How can I place an order for TPS3306-20D through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3306-20D 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 TPS3306-20D reliable?
The price and inventory of TPS3306-20D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3306-20D is usually 5 days.
3.What payment methods are accepted for TPS3306-20D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3306-20D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3306-20D?
TPS3306-20D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3306-20D 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 TPS3306-20D?
For technical support, including TPS3306-20D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3306-20D requirements.
6.How does Aetrix verify that TPS3306-20D is sourced from the original manufacturer or authorized distributors?
All TPS3306-20D 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 TPS3306-20D meets industry standards.
7.What is the process for return or replacement of TPS3306-20D?
All TPS3306-20D units undergo pre-shipment inspection (PSI). If there is an issue with TPS3306-20D, 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 TPS3306-20D part is unused and in its original packaging.
Return procedure for TPS3306-20D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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