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Texas Instruments TPS3306-25DGKG4
- Part No.:
- TPS3306-25DGKG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3306-25DGKG4.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,429
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Product details
Overview
TPS3306-25DGKG4 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. It operates across –40°C to +85°C in the 8-pin VSSOP package and is used in embedded control systems where reliable dual-rail initialization and fault detection are critical.
For engineers reviewing the TPS3306-25DGKG4 datasheet, TPS3306-25DGKG4 pinout, TPS3306-25DGKG4 application, or TPS3306-25DGKG4 equivalent, this page delivers verified specifications including SENSE1/SENSE2 threshold voltages (2.93 V / 2.25 V), watchdog timing, RESET assertion behavior below VDD ≥1.1 V, and VSSOP-8 terminal functions - all essential for power sequencing validation and BOM selection.
Technical Context
The TPS3306-25DGKG4 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 remains active low until both sensed voltages exceed their respective thresholds and sustain for ≥100 ms.
It includes a transition-triggered watchdog circuit (0.8 s timeout) with WDI input sensitive to either rising or falling edges, and a separate PFI/PFO path comparing external voltages against 1.25 V - enabling flexible low-battery or auxiliary supply monitoring without additional components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SENSE1 Threshold | 2.93 V (monitors 3.3 V rail; asserts RESET if drops below, with 20 mV hysteresis) |
| SENSE2 Threshold | 2.25 V (monitors 2.5 V rail; enables dual-rail coordination for DSP core/I/O sequencing) |
| RESET Delay Time | 100 ms (ensures stable power-up before releasing processor reset, programmable only via internal timer) |
| Watchdog Timeout | 0.8 s (requires WDI edge every ≤0.8 s; prevents runaway code in safety-critical firmware loops) |
| Supply Current | 15 µA typical (enables use in battery-backed systems without significant drain) |
| Operating Temp | –40°C to +85°C (qualified for industrial and automotive-adjacent embedded applications) |
| VDD Range | 2.7 V to 6 V (supports wide input range while maintaining accurate sensing down to 1.1 V VDD) |
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 |
|---|---|---|
| 1 - SENSE1 | Voltage sense input 1 | Monitors primary supply (e.g., 3.3 V); threshold = 2.93 V; high-impedance input (≤8 µA leakage) |
| 2 - SENSE2 | Voltage sense input 2 | Monitors secondary supply (e.g., 2.5 V); threshold = 2.25 V; independent hysteresis and timing |
| 3 - PFI | Power-fail comparator input | Compares external voltage to 1.25 V reference; enables custom low-battery or auxiliary rail monitoring |
| 4 - GND | Ground reference | Common return for all analog and digital functions; requires low-impedance PCB connection |
| 5 - RESET | Active-low open-drain reset output | Drives microprocessor / DSP reset line; requires external pull-up; asserted below VDD ≥1.1 V |
| 6 - PFO | Active-low open-drain power-fail output | Signals PFI threshold breach; isolated from RESET logic; supports independent warning signaling |
| 7 - WDI | Watchdog timer input | Edge-triggered (rising/falling); disables watchdog if left floating or held static |
| 8 - VDD | Supply voltage input | Powers internal circuitry; valid from 2.7 V to 6 V; RESET defined down to 1.1 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneous 3.3 V/2.5 V monitoring with separate thresholds and hysteresis avoids single-point failure in multi-rail systems |
| Integrated 100 ms power-on reset timer | Eliminates need for external RC timing network; ensures deterministic release after stable power conditions |
| 0.8 s watchdog with edge-triggered WDI | Reduces firmware overhead vs. level-sensitive designs; tolerates brief signal glitches without false timeout |
| Open-drain RESET and PFO outputs | Enables wired-OR configuration with other supervisors or logic; supports mixed-voltage system interfacing |
| 1.25 V precision PFI reference | Allows accurate monitoring of any voltage >1.25 V using two 1% resistors; minimizes external component count |
Applications
| DSP Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Coordinating startup of 3.3 V I/O and 2.5 V core supplies in TI C5000/C6000 DSPs. IC Role / Device Role / Timing Role: Dual-threshold supervisor ensuring core voltage stabilizes before I/O enable, with synchronized RESET release. Use Value: Prevents bus contention and latch-up during asymmetric rail ramp-up; eliminates need for discrete timing circuits. |
Use Scenario: Monitoring redundant 24 V DC input and 3.3 V logic rail in programmable logic controllers. IC Role / Device Role / Timing Role: Primary supervisor for main logic supply and backup PFI input for auxiliary 24 V monitoring. Use Value: Enables early power-fail warning (via PFO) while maintaining clean reset assertion on main rail dropout. |
| Battery-Powered Telematics | Automotive Infotainment Module |
Use Scenario: Managing Li-ion battery discharge (3.0–4.2 V) and regulated 2.5 V SoC supply in vehicle tracking units. IC Role / Device Role / Timing Role: SENSE2 monitors 2.5 V SoC rail; PFI monitors battery via resistor divider for low-voltage warning. Use Value: Delivers precise brownout detection at 2.25 V and configurable battery alert at 3.2 V (using 1.25 V reference). |
Use Scenario: Supervising dual supplies in head-unit SoCs where 3.3 V interface and 2.5 V core must meet AEC-Q100 functional safety requirements. IC Role / Device Role / Timing Role: Resets application processor only after both rails exceed thresholds and stabilize for 100 ms. Use Value: Meets ASIL-B timing constraints for safe boot; watchdog guards against firmware hangs during CAN message processing. |
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 | SOIC-8 package (6.4 mm × 5.2 mm), higher thermal resistance (377 mW @ 85°C vs. 220 mW for DGK), same electrical specs | Preferred for through-hole prototyping or legacy board layouts; less suitable for space-constrained automotive modules | Select when board real estate allows larger footprint and reflow compatibility with SOIC carriers is required. |
| TPS3808G33DBVR | Single-supply supervisor (3.3 V only), no SENSE2 or PFI; 35 µA IQ; adjustable delay; different pinout and no watchdog | Lacks dual-rail coordination and power-fail warning; requires external circuitry for 2.5 V monitoring | Only viable if system reduces to single-rail supervision and can accommodate redesign of reset timing and fault signaling. |
Compared with TPS3306-25DR, the TPS3306-25DGKG4 offers 40% smaller PCB area and better thermal performance in compact enclosures; compared with TPS3808G33DBVR, it provides native dual-rail coordination and integrated PFI functionality - eliminating design compromises in multi-voltage DSP systems.
Availability
TPS3306-25DGKG4 is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered telematics units, and automotive infotainment modules requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for TPS3306-25DGKG4 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 DSP and multi-rail processor systems needing coordinated power-on reset, watchdog protection, and auxiliary supply monitoring - addressing timing-critical boot integrity in telecom, industrial automation, and transportation electronics.
FAQ
What is the exact SENSE1 and SENSE2 threshold voltage for TPS3306-25DGKG4?
The TPS3306-25DGKG4 has a nominal SENSE1 threshold of 2.93 V (for 3.3 V rail supervision) and SENSE2 threshold of 2.25 V (for 2.5 V rail supervision), both with ±3% tolerance over temperature and 20 mV hysteresis. These values are factory-trimmed and specified in Table 1 of the SLVS290C datasheet.
Does TPS3306-25DGKG4 require external components to function as a basic dual-supply supervisor?
No - the TPS3306-25DGKG4 operates autonomously with only VDD, GND, and the two SENSE inputs connected. External pull-up resistors on RESET and PFO are required for open-drain operation, but no timing capacitors or resistors are needed for its 100 ms reset delay or watchdog functionality.
Can the watchdog timer in TPS3306-25DGKG4 be disabled, and how?
Yes - the watchdog timer in TPS3306-25DGKG4 is disabled by leaving the WDI pin unconnected (high-impedance) or tying it to a static logic level. The datasheet confirms that absence of transitions on WDI causes internal retriggering and prevents timeout assertion of RESET.
Is TPS3306-25DGKG4 compatible with automotive applications?
The standard TPS3306-25DGKG4 is qualified for industrial temperature range (–40°C to +85°C) and is widely used in automotive infotainment and telematics. For AEC-Q100 compliance, TI offers the pin-compatible TPS3306-25Q1 variant - the base TPS3306-25DGKG4 itself is not AEC-Q100 certified.
What package type and dimensions does TPS3306-25DGKG4 use?
TPS3306-25DGKG4 uses the VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body size, 0.65 mm lead pitch, 1.1 mm maximum height, and 8 terminals. The "G4" suffix denotes RoHS-compliant, lead-free, NiPdAu finish per TI's packaging nomenclature.
TPS3306-25DGKG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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
TPS3306-25DGKG4 FAQ
1.How can I place an order for TPS3306-25DGKG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3306-25DGKG4 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 TPS3306-25DGKG4 reliable?
The price and inventory of TPS3306-25DGKG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3306-25DGKG4 is usually 5 days.
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Once your TPS3306-25DGKG4 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 TPS3306-25DGKG4?
For technical support, including TPS3306-25DGKG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3306-25DGKG4 requirements.
6.How does Aetrix verify that TPS3306-25DGKG4 is sourced from the original manufacturer or authorized distributors?
All TPS3306-25DGKG4 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 TPS3306-25DGKG4 meets industry standards.
7.What is the process for return or replacement of TPS3306-25DGKG4?
All TPS3306-25DGKG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3306-25DGKG4, 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 TPS3306-25DGKG4 part is unused and in its original packaging.
Return procedure for TPS3306-25DGKG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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