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Texas Instruments TPS3306-25DGKRG4
- Part No.:
- TPS3306-25DGKRG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3306-25DGKRG4.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,975
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Product details
Overview
TPS3306-25DGKRG4 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 power-fail comparator. Used in embedded control systems where reliable dual-rail initialization and fault detection are critical.
For engineers reviewing the TPS3306-25DGKRG4 datasheet, TPS3306-25DGKRG4 pinout, TPS3306-25DGKRG4 application, or TPS3306-25DGKRG4 equivalent, key selection considerations include SENSE1/SENSE2 threshold accuracy (2.93 V / 2.25 V typ), ultra-low supply current (15 µA typ), MSOP-8 package compatibility, and watchdog enable/disable via WDI pin configuration.
Technical Context
The TPS3306-25DGKRG4 implements two independent voltage comparators with hysteresis (20 mV at 2.25 V threshold) to monitor SENSE1 (3.3 V rail) and SENSE2 (2.5 V rail), asserting active-low RESET when either falls below its respective VIT. Its internal 100 ms reset delay timer ensures stable system initialization after both supplies exceed thresholds.
A separate PFI comparator referenced to 1.25 V enables external power-fail detection on auxiliary supplies, while the WDI-triggered watchdog circuit provides program execution supervision with 0.8 s timeout - configurable by toggling WDI or leaving it unconnected to disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SENSE1 Threshold | 2.93 V typical - monitors 3.3 V supply with ±3% tolerance; ensures reset assertion before brownout affects core logic. |
| SENSE2 Threshold | 2.25 V typical - precisely supervises 2.5 V I/O or analog supply; 20 mV hysteresis prevents chatter near trip point. |
| Reset Delay Time | 100 ms typical - guarantees full power stabilization and clock lock before releasing RESET to downstream logic. |
| Watchdog Timeout | 0.8 s typical - detects firmware hangs in real-time DSP or microcontroller applications without requiring external timing components. |
| Supply Current | 15 µA typical at VDD = 3.3 V - enables use in battery-backed or low-power always-on subsystems without significant drain. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and automotive under-hood environments per TI's production characterization. |
| VDD Range | 2.7 V to 6 V - supports direct connection to monitored 3.3 V rail or separate bias supply; defined RESET down to VDD ≥ 1.1 V. |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 0.65 mm pitch, 1.1 mm max height, exposed thermal pad (non-electrical), RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SENSE1 | Voltage sense input 1 | Monitors primary 3.3 V supply; internally compared to 2.93 V reference; requires no external components for basic operation. |
| 2 - SENSE2 | Voltage sense input 2 | Monitors secondary 2.5 V supply; threshold fixed at 2.25 V; independent hysteresis prevents false resets during ripple. |
| 3 - PFI | Power-fail comparator input | Accepts external voltage divider output; compared to internal 1.25 V reference; enables custom power-fail detection on any rail ≥1.25 V. |
| 4 - GND | Analog/digital ground | Common return for all internal comparators and outputs; must be low-impedance and decoupled with 0.1 µF ceramic capacitor. |
| 5 - RESET | Active-low open-drain reset output | Pulls low during power-up, brownout, or watchdog timeout; requires external pull-up to host VDD (e.g., 10 kΩ to 3.3 V). |
| 6 - PFO | Active-low open-drain power-fail output | Asserts low when PFI < 1.25 V; used for low-battery warning or auxiliary supply monitoring; shares same drive strength as RESET. |
| 7 - WDI | Watchdog timer input | Edge-sensitive (rising/falling); toggling within 0.8 s resets timer; floating or high-Z disables watchdog function entirely. |
| 8 - VDD | Supply voltage input | Power source for internal circuitry; also serves as reference for WDI logic thresholds (VIH = 0.7×VDD, VIL = 0.3×VDD). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneously monitors 3.3 V and 2.5 V rails with dedicated, factory-trimmed thresholds - eliminates need for external resistor networks on SENSE inputs. |
| Integrated 100 ms power-on reset timer | Guarantees minimum reset pulse width after both supplies stabilize - prevents premature release of RESET due to transient overshoot or noise. |
| Configurable watchdog timer (0.8 s) | Hardware-level program execution monitor; disabled by default if WDI is left unconnected - simplifies integration in non-critical applications. |
| Low quiescent current (15 µA) | Enables deployment in always-on subsystems (e.g., RTC backup, wake-on-event circuits) without compromising battery life or thermal budget. |
| Open-drain RESET and PFO outputs | Supports wired-OR reset bus architectures and mixed-voltage systems; compatible with 1.8 V, 3.3 V, or 5 V pull-up domains. |
Applications
| Industrial PLC I/O Module | DSP-Based Motor Controller |
|---|---|
Use Scenario: Dual-rail power sequencing in modular I/O cards with isolated 3.3 V logic and 2.5 V ADC reference supplies. IC Role / Device Role / Timing Role: Supervises both rails independently; asserts RESET until both reach valid operating range; provides 100 ms hold time for FPGA configuration. Use Value: Prevents metastability and latch-up during cold start or hot-swap events by ensuring strict sequencing compliance before enabling digital logic. |
Use Scenario: Real-time motor control using TI C2000™ DSP with separate 3.3 V core and 2.5 V analog front-end supplies. IC Role / Device Role / Timing Role: Generates power-on reset and monitors for undervoltage faults; watchdog watches DSP firmware loop integrity during torque commutation cycles. Use Value: Eliminates risk of runaway motor behavior caused by silent firmware lockup or supply droop during high-current transients. |
| Automotive Body Control Module | Portable Medical Sensor Hub |
Use Scenario: Low-power BCM with 3.3 V MCU and 2.5 V sensor interface, operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Provides temperature-stable reset assertion; PFI monitors 12 V battery via resistor divider for low-voltage warning. Use Value: Enables graceful shutdown and diagnostic flagging before battery sag causes EEPROM corruption or CAN bus errors. |
Use Scenario: Battery-powered wearable sensor hub aggregating ECG, SpO₂, and temperature data with 3.3 V MCU and 2.5 V precision ADC. IC Role / Device Role / Timing Role: Ensures clean boot after coin-cell replacement; watchdog verifies sensor acquisition loop execution; low IDD extends runtime. Use Value: Guarantees clinical-grade data integrity by preventing corrupted measurements due to brownout or firmware stall during acquisition bursts. |
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 and functionality; SOIC-8 (D) package instead of VSSOP-8 (DGK); 2.5 mm wider body, 1.75 mm height. | Preferred for through-hole prototyping or legacy PCBs with SOIC footprints; higher thermal resistance than DGK. | Select TPS3306-25DR when board layout uses standard SOIC-8 land pattern or requires easier hand-soldering. |
| MAX6816EUT+T | Single-supply supervisor (3.3 V only); no SENSE2 input, no PFI/PFO, no watchdog; 3 µA supply current; SOT-23-6. | Limited to single-rail monitoring; lacks dual-voltage capability and power-fail warning required for TPS3306-25DGKRG4 use cases. | Only suitable if system has only one critical rail and no watchdog or auxiliary monitoring needs. |
Compared with TPS3306-25DR, the TPS3306-25DGKRG4 offers space savings and improved thermal performance in compact designs; compared with MAX6816EUT+T, it delivers essential dual-rail supervision, watchdog, and PFI functionality missing in the single-rail alternative.
Availability
TPS3306-25DGKRG4 is available at Aetrix Electronics and suitable for industrial PLCs, DSP-based motor controllers, automotive body control modules, and portable medical sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TPS3306-25DGKRG4 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 specializing in analog, embedded processing, and power management technologies, with decades of experience in high-reliability industrial and automotive IC design.
The TPS3306 family was engineered specifically for dual-voltage DSP and microprocessor systems needing precise, low-power supervision of multiple supply rails - addressing timing-critical boot integrity and runtime fault detection in resource-constrained environments.
FAQ
What is the exact SENSE1 and SENSE2 threshold voltage for TPS3306-25DGKRG4?
The TPS3306-25DGKRG4 has a nominal SENSE1 threshold of 2.93 V (for monitoring a 3.3 V rail) and a nominal SENSE2 threshold of 2.25 V (for monitoring a 2.5 V rail), both specified at TA = 25°C and with ±3% variation over temperature and process. These values are factory-trimmed and do not require external resistor networks for basic operation.
Does TPS3306-25DGKRG4 require external components to function as a dual-supply supervisor?
No - the TPS3306-25DGKRG4 operates as a complete dual-supply supervisor with only a 0.1 µF ceramic bypass capacitor on VDD. SENSE1 and SENSE2 thresholds are internally fixed; RESET and PFO are open-drain and require external pull-up resistors; WDI may be left unconnected to disable the watchdog.
Can TPS3306-25DGKRG4 monitor voltages other than 3.3 V and 2.5 V?
Yes - the PFI input accepts an externally divided voltage referenced to the internal 1.25 V comparator threshold, enabling supervision of any rail ≥1.25 V (e.g., 5 V, 12 V, or battery voltage). SENSE1 and SENSE2 are fixed at 2.93 V and 2.25 V and cannot be reconfigured.
What is the watchdog timeout behavior of TPS3306-25DGKRG4?
The TPS3306-25DGKRG4 watchdog timer times out after 0.8 s if WDI receives no edge transition. Upon timeout, RESET pulses low for 100 ms, then returns high - simultaneously resetting the watchdog counter. Leaving WDI unconnected disables the watchdog entirely, with no impact on reset or supervision functions.
Is TPS3306-25DGKRG4 pin-compatible with other TPS3306 variants?
Yes - all TPS3306-x variants (e.g., TPS3306-15DGKRG4, TPS3306-33DGKRG4) share identical pinout, package, and interface behavior. Only the SENSE1/SENSE2 threshold voltages differ between part numbers; no PCB changes are needed when substituting within the same DGK package.
TPS3306-25DGKRG4 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:
- Obsolete
- 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
TPS3306-25DGKRG4 FAQ
1.How can I place an order for TPS3306-25DGKRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3306-25DGKRG4 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 TPS3306-25DGKRG4 reliable?
The price and inventory of TPS3306-25DGKRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3306-25DGKRG4 is usually 5 days.
3.What payment methods are accepted for TPS3306-25DGKRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3306-25DGKRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3306-25DGKRG4?
TPS3306-25DGKRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3306-25DGKRG4 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 TPS3306-25DGKRG4?
For technical support, including TPS3306-25DGKRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3306-25DGKRG4 requirements.
6.How does Aetrix verify that TPS3306-25DGKRG4 is sourced from the original manufacturer or authorized distributors?
All TPS3306-25DGKRG4 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 TPS3306-25DGKRG4 meets industry standards.
7.What is the process for return or replacement of TPS3306-25DGKRG4?
All TPS3306-25DGKRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3306-25DGKRG4, 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 TPS3306-25DGKRG4 part is unused and in its original packaging.
Return procedure for TPS3306-25DGKRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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