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Texas Instruments TPS3306-25DGKR
- Part No.:
- TPS3306-25DGKR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3306-25DGKR.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,756
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Product details
Overview
TPS3306-25DGKR from Texas Instruments is a dual-voltage supervisory IC designed for DSP and processor-based systems requiring independent monitoring of 3.3 V and 2.5 V rails. It integrates power-on reset (100 ms delay), watchdog timer (0.8 s timeout), open-drain RESET and PFO outputs, and a dedicated PFI comparator - enabling robust system initialization and power-fail detection in embedded control and portable equipment.
For engineers reviewing the TPS3306-25DGKR datasheet, TPS3306-25DGKR pinout, TPS3306-25DGKR application, or TPS3306-25DGKR equivalent, this device delivers verified dual-threshold supervision (2.93 V / 2.25 V), ultra-low 15 µA supply current, MSOP-8 packaging, and operation across –40°C to +85°C - critical for battery-powered instrumentation and automotive-grade industrial designs.
Technical Context
The TPS3306-25DGKR implements two independent voltage comparators with fixed thresholds (2.93 V on SENSE1, 2.25 V on SENSE2) referenced to an internal 1.25 V bandgap, each with ~20 mV hysteresis. Its RESET output asserts low when either sense input falls below its threshold or during power-up until VDD ≥ 1.1 V, then remains active for 100 ms after both inputs exceed thresholds.
A separate PFI comparator compares external voltage against the same 1.25 V reference (±10 mV hysteresis), driving an open-drain PFO output; the integrated watchdog monitors WDI transitions with 0.8 s timeout and resets on any edge - disabled if WDI is left floating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SENSE1 Threshold | 2.93 V (monitors 3.3 V rail with 2.93 V trip point) |
| SENSE2 Threshold | 2.25 V (monitors 2.5 V rail with 2.25 V trip point) |
| RESET Delay Time | 100 ms (ensures stable power before releasing reset signal) |
| Watchdog Timeout | 0.8 s (detects firmware lockup; triggered by WDI edge) |
| Supply Current | 15 µA typical (enables long battery life in portable systems) |
| Operating Temp | –40°C to +85°C (supports industrial and automotive ambient conditions) |
| VDD Range | 2.7 V to 6 V (powers device from main supply or auxiliary rail) |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 0.65 mm pitch, 1.1 mm max height, exposed pad not electrically connected. RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1 | Voltage monitor input 1 | Connects to 3.3 V rail; triggers RESET if voltage drops below 2.93 V |
| SENSE2 | Voltage monitor input 2 | Connects to 2.5 V rail; triggers RESET if voltage drops below 2.25 V |
| PFI | Power-fail comparator input | Monitors auxiliary voltage (e.g., battery); trips PFO when input falls below 1.25 V |
| GND | Ground reference | Analog and digital ground return; must be low-impedance connection |
| PFO | Open-drain power-fail output | Active-low signal indicating auxiliary supply failure; requires external pull-up |
| WDI | Watchdog timer input | Edge-triggered (rising/falling); resets watchdog timer; disable by leaving unconnected |
| RESET | Open-drain reset output | Active-low system reset signal; asserted during power-up, brownout, or watchdog timeout |
| VDD | Supply voltage input | Primary power source (2.7–6 V); powers internal circuitry and enables operation down to 1.1 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneously monitors 3.3 V and 2.5 V rails with fixed, factory-trimmed thresholds (2.93 V / 2.25 V) |
| Integrated watchdog timer | 0.8 s timeout with edge-sensitive WDI input - detects software hangs without external components |
| Power-on reset with delay | Guaranteed RESET assertion during power-up and 100 ms hold time after valid supply stabilization |
| Low-power operation | 15 µA typical supply current enables use in always-on battery-backed subsystems |
| Flexible power-fail detection | PFI/PFO pair allows monitoring of third voltage (e.g., backup battery) using external resistor divider |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Supervises dual-core DSP system with 3.3 V I/O and 2.5 V core supplies while detecting AC mains loss via PFI. IC Role / Device Role / Timing Role: Dual-rail supervisor providing synchronized power-on reset, brownout protection, and early AC fail warning via PFO. Use Value: Prevents corrupted state during undervoltage events and enables graceful shutdown before backup battery depletion. | Use Scenario: Monitors main Li-ion battery (3.3 V) and low-power sensor rail (2.5 V) in handheld ECG unit with real-time watchdog oversight. IC Role / Device Role / Timing Role: Ensures deterministic boot sequence and runtime firmware integrity through combined voltage supervision and 0.8 s watchdog. Use Value: Extends operational runtime via 15 µA quiescent current and eliminates silent failures in life-critical diagnostics. |
| Automotive ADAS Camera Module | Smart Energy Meter |
Use Scenario: Validates 3.3 V imaging processor supply and 2.5 V ISP core voltage in rear-view camera under cold-crank conditions (–40°C). IC Role / Device Role / Timing Role: Provides temperature-stable reset assertion and hysteresis-enforced release to prevent chatter during marginal supply recovery. Use Value: Meets AEC-Q100 stress requirements via –40°C to +85°C qualification and ensures reliable startup during engine cranking transients. | Use Scenario: Supervises microcontroller (3.3 V) and metrology ADC (2.5 V) supplies while using PFI to detect utility grid outage for backup clock switchover. IC Role / Device Role / Timing Role: Delivers precise dual-threshold monitoring plus independent PFI-triggered notification for non-volatile event logging. Use Value: Enables accurate timestamping of grid failures and maintains secure metering functionality during brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3306-25DR | Same electrical specs; SOIC-8 package (4.9 mm × 3.9 mm vs. DGK's 3.0 mm × 3.0 mm) | Preferred where board space permits larger footprint and hand-soldering is required | Select for legacy PCB compatibility or prototyping with through-hole adapters |
| TPS3823-25DBVR | Single-supply supervisor (2.5 V only); no SENSE1, PFI, or watchdog; 3-pin SOT-23 | Only monitors one rail; lacks dual-rail coordination and power-fail warning capability | Choose only when supervising 2.5 V alone and space constraints demand minimal footprint |
Compared with TPS3306-25DR and TPS3823-25DBVR, the TPS3306-25DGKR uniquely combines compact VSSOP-8 size, dual-rail supervision with fixed 2.93 V/2.25 V thresholds, integrated watchdog, and PFI-based auxiliary monitoring - making it irreplaceable for space-constrained, safety-critical dual-voltage systems requiring coordinated reset behavior.
Availability
TPS3306-25DGKR is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive ADAS modules, smart energy meters, and battery-powered instrumentation requiring stable component supply with guaranteed long-term availability.
Supply support for TPS3306-25DGKR 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 consumer markets.
The TPS3306 family was engineered specifically for dual-rail DSP and microprocessor systems needing coordinated power sequencing, brownout protection, and watchdog safety - targeting high-reliability embedded control applications.
FAQ
What is the exact SENSE1 and SENSE2 threshold voltage for TPS3306-25DGKR?
The TPS3306-25DGKR has factory-trimmed thresholds: SENSE1 trips at 2.93 V (for 3.3 V rail supervision) and SENSE2 at 2.25 V (for 2.5 V rail supervision), with ±70 mV tolerance over temperature and supply. These values are specified in Table 1 of the SLVS290C datasheet and confirmed across –40°C to +85°C.
Does TPS3306-25DGKR require external components to function as a basic dual-supervisor?
No - the TPS3306-25DGKR operates autonomously with only VDD, GND, and the two SENSE inputs connected. External pull-up resistors are required only on open-drain RESET and PFO outputs. The watchdog (WDI) and PFI functions are optional and may be left unconnected if unused.
Can TPS3306-25DGKR supervise voltages other than 3.3 V and 2.5 V?
Yes - the PFI input accepts any voltage above 1.25 V (with hysteresis) and can monitor auxiliary supplies like batteries or backup rails using a precision resistor divider. However, SENSE1 and SENSE2 thresholds are fixed at 2.93 V and 2.25 V respectively and cannot be adjusted.
What is the minimum VDD required for TPS3306-25DGKR to assert RESET?
The TPS3306-25DGKR begins asserting RESET when VDD rises above 1.1 V, per the "Power-up reset voltage" specification. This ensures early reset activation during power ramp-up, even before the monitored SENSE rails reach their thresholds.
Is TPS3306-25DGKR qualified for automotive applications?
The base TPS3306-25DGKR is not AEC-Q100 qualified; however, TI offers the pin-compatible TPS3306-Q1 variant (e.g., TPS3306-25QDGKR) which is fully qualified for automotive use. For industrial or medical designs, the standard TPS3306-25DGKR meets full –40°C to +85°C operation with production-grade reliability.
TPS3306-25DGKR 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:
- 2.25V, 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-VSSOP
TPS3306-25DGKR FAQ
1.How can I place an order for TPS3306-25DGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3306-25DGKR 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 TPS3306-25DGKR reliable?
The price and inventory of TPS3306-25DGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3306-25DGKR is usually 5 days.
3.What payment methods are accepted for TPS3306-25DGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3306-25DGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3306-25DGKR?
TPS3306-25DGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3306-25DGKR 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 TPS3306-25DGKR?
For technical support, including TPS3306-25DGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3306-25DGKR requirements.
6.How does Aetrix verify that TPS3306-25DGKR is sourced from the original manufacturer or authorized distributors?
All TPS3306-25DGKR 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 TPS3306-25DGKR meets industry standards.
7.What is the process for return or replacement of TPS3306-25DGKR?
All TPS3306-25DGKR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3306-25DGKR, 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 TPS3306-25DGKR part is unused and in its original packaging.
Return procedure for TPS3306-25DGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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