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Texas Instruments TPS3306-15D
- Part No.:
- TPS3306-15D
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS3306-15D.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:232
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Product details
Overview
TPS3306-15D from Texas Instruments is a dual-voltage supervisory IC designed for DSP and processor-based systems requiring independent monitoring of 3.3 V and 1.5 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.
For engineers reviewing the TPS3306-15D datasheet, TPS3306-15D pinout, TPS3306-15D application, or TPS3306-15D equivalent, key selection criteria include dual-threshold sensing (2.93 V / 1.40 V), ultra-low 15 µA supply current, defined RESET assertion down to VDD ≥ 1.1 V, and compatibility with battery-powered and automotive embedded systems.
Technical Context
The TPS3306-15D integrates two independent voltage comparators for SENSE1 (3.3 V rail) and SENSE2 (1.5 V rail), each with fixed threshold voltages (2.93 V and 1.40 V typ.) and 30 mV hysteresis. Its internal power-on reset generator asserts RESET until both sensed voltages exceed their thresholds and remain stable for 100 ms.
A dedicated PFI input compares external voltages against a 1.25 V internal reference, driving an open-drain PFO output for power-fail detection. The WDI input supports edge-triggered watchdog functionality with 0.8 s timeout; leaving WDI unconnected disables the watchdog.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SENSE1 Threshold | 2.93 V typical - monitors 3.3 V supply with ±3% tolerance at TA = 25°C |
| SENSE2 Threshold | 1.40 V typical - monitors 1.5 V supply with ±3% tolerance at TA = 25°C |
| RESET Delay Time | 100 ms typical - ensures reliable system initialization after both supplies stabilize |
| Watchdog Timeout | 0.8 s typical - detects firmware lockup in microprocessor/DSP applications |
| Supply Current | 15 µA typical - enables long battery life in portable equipment |
| Operating Voltage | 2.7 V to 6 V - supports wide input range while maintaining supervision integrity |
| Temperature Range | –40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
TPS3306-15D 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 supply (e.g., 3.3 V); RESET asserted if voltage drops below 2.93 V |
| 2 - SENSE2 | Voltage sense input 2 | Monitors secondary supply (e.g., 1.5 V); RESET asserted if voltage drops below 1.40 V |
| 3 - PFI | Power-fail comparator input | Accepts external voltage divider; triggers PFO when input falls below 1.25 V reference |
| 4 - GND | Ground reference | Common return path for all internal circuits and external sensing networks |
| 5 - RESET | Active-low reset output | Open-drain output; requires external pull-up; drives system reset line low on fault |
| 6 - PFO | Power-fail output | Open-drain output; signals auxiliary supply failure independently of main RESET |
| 7 - WDI | Watchdog timer input | Edge-sensitive; toggling within 0.8 s prevents RESET assertion; unconnected disables watchdog |
| 8 - VDD | Supply voltage input | Power source for internal circuitry; RESET active for VDD ≥ 1.1 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneous monitoring of 3.3 V and 1.5 V rails with separate thresholds and hysteresis |
| Integrated watchdog timer | 0.8 s timeout with edge-triggered WDI input eliminates need for external timing components |
| Power-fail warning capability | PFI/PFO pair enables early detection of auxiliary supply collapse without affecting main reset logic |
| Low-power operation | 15 µA typical supply current extends battery runtime in portable instrumentation and handheld devices |
| Robust reset generation | Guaranteed RESET assertion from VDD ≥ 1.1 V ensures reliable startup even during brownout conditions |
Applications
| Industrial PLC Controller | Automotive Infotainment Head Unit |
|---|---|
Use Scenario: Monitors dual-core DSP power rails (3.3 V I/O and 1.5 V core) during cold cranking where battery dips to 6 V. IC Role / Device Role / Timing Role: Dual-supply supervisor ensuring synchronized reset of both processor domains before firmware execution. Use Value: Prevents partial initialization and latch-up by holding RESET until both supplies meet threshold and stabilize for 100 ms. | Use Scenario: Detects backup battery voltage drop below 2.7 V while main 12 V supply remains nominal. IC Role / Device Role / Timing Role: PFI input configured with resistor divider to monitor 3.3 V backup rail; PFO signals low-battery condition to MCU. Use Value: Enables graceful shutdown and data save before backup power loss, avoiding EEPROM corruption. |
| Portable Medical Monitor | Network Edge Router |
Use Scenario: Supervises lithium-ion battery–fed 3.3 V analog front-end and 1.5 V FPGA core in ECG acquisition unit. IC Role / Device Role / Timing Role: Watchdog input tied to FPGA heartbeat signal; resets system if firmware stalls during signal processing. Use Value: Maintains patient safety compliance by guaranteeing deterministic recovery from software faults without manual intervention. | Use Scenario: Ensures clean boot sequence for dual-voltage ASIC (3.3 V interface, 2.5 V core) after AC power restoration. IC Role / Device Role / Timing Role: SENSE1 monitors 3.3 V rail; SENSE2 monitors 2.5 V rail via external resistor divider scaling 2.5 V to 1.4 V. Use Value: Eliminates need for discrete supervisors and reduces BOM count while preserving independent fault detection per rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3306-15DGK | VSSOP-8 package (2.3 mm × 2.0 mm), same electrical specs, higher thermal resistance (271 mW @ +70°C vs 464 mW) | Better suited for space-constrained PCBs; requires tighter layout control for thermal management | Select DGK for compact designs where board area is critical and ambient temperature stays ≤ +70°C |
| TPS3823-01DBVR | Single-supply supervisor (3.08 V threshold), no PFI/PFO or watchdog; SOT-23-5 package; 1.2 µA quiescent current | Lacks dual-rail monitoring and auxiliary power-fail detection; only suitable for single-rail systems | Choose only if supervising one rail and ultra-low power (< 2 µA) is mandatory; not functionally equivalent |
Compared with TPS3306-15DGK, the TPS3306-15D offers higher power dissipation margin and simpler thermal design in SOIC-8, while TPS3823-01DBVR trades dual supervision and watchdog capability for extreme low-power operation in a smaller footprint-neither is pin-compatible nor drop-in replaceable.
Availability
TPS3306-15D is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive infotainment head units, and portable medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TPS3306-15D 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability ICs.
The TPS3306 family was developed specifically for dual-rail supervision in DSP and processor-based systems, addressing the need for coordinated reset sequencing, power-fail warning, and watchdog protection in resource-constrained embedded platforms.
FAQ
What is the exact SENSE1 and SENSE2 threshold voltage for TPS3306-15D?
The TPS3306-15D has a typical SENSE1 threshold of 2.93 V (for 3.3 V rail monitoring) and a typical SENSE2 threshold of 1.40 V (for 1.5 V rail monitoring), both specified over –40°C to +85°C with 30 mV hysteresis. These values are factory-trimmed and do not require external calibration. The TPS3306-15D datasheet confirms these thresholds in Table 1 and Electrical Characteristics section.
Can TPS3306-15D supervise voltages other than 3.3 V and 1.5 V?
Yes - while the TPS3306-15D is optimized for 3.3 V/1.5 V pairs, its SENSE1 and SENSE2 inputs accept any DC voltage up to (VDD + 0.3) V, and the PFI input supports custom thresholds via external resistor dividers referenced to the internal 1.25 V bandgap. The TPS3306-15D's flexibility allows supervision of 2.5 V/1.8 V or 5 V/3.3 V rails using appropriate scaling networks.
How does the watchdog timer in TPS3306-15D operate?
The TPS3306-15D watchdog timer triggers on either rising or falling edges at the WDI pin and resets on each valid transition within a 0.8 s timeout window. If no edge occurs, RESET activates for 100 ms. Leaving WDI unconnected disables the watchdog. The TPS3306-15D's watchdog requires no external components and operates independently of the voltage supervision function.
Is TPS3306-15D compatible with automotive applications?
The standard TPS3306-15D is rated for –40°C to +85°C and used in industrial and consumer systems. For automotive applications, TI offers the TPS3306-Q1 variant, which is AEC-Q100 qualified and tested for zero-defect reliability in harsh environments. The TPS3306-15D itself is not automotive-qualified, though it may be used in non-safety-critical subsystems with proper system-level validation.
What package options are available for TPS3306-15D?
The TPS3306-15D is supplied exclusively in the 8-pin SOIC (D) package, 3.9 mm × 4.9 mm body size, with NiPdAu lead finish and RoHS compliance. Alternate variants like TPS3306-15DGK use the VSSOP-8 (DGK) package. The TPS3306-15D ordering code explicitly denotes the SOIC package per TI's Package Option Addendum.
TPS3306-15D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.4V, 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
TPS3306-15D FAQ
1.How can I place an order for TPS3306-15D through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3306-15D 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 TPS3306-15D reliable?
The price and inventory of TPS3306-15D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3306-15D is usually 5 days.
3.What payment methods are accepted for TPS3306-15D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3306-15D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3306-15D?
TPS3306-15D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3306-15D 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 TPS3306-15D?
For technical support, including TPS3306-15D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3306-15D requirements.
6.How does Aetrix verify that TPS3306-15D is sourced from the original manufacturer or authorized distributors?
All TPS3306-15D 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 TPS3306-15D meets industry standards.
7.What is the process for return or replacement of TPS3306-15D?
All TPS3306-15D units undergo pre-shipment inspection (PSI). If there is an issue with TPS3306-15D, 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 TPS3306-15D part is unused and in its original packaging.
Return procedure for TPS3306-15D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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