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Texas Instruments TPS3306-18DGKR
- Part No.:
- TPS3306-18DGKR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3306-18DGKR.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,455
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Product details
Overview
TPS3306-18DGKR from Texas Instruments is a dual-voltage supervisory IC designed for DSP and processor-based systems requiring independent monitoring of 3.3 V and 1.8 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 - all in an 8-pin VSSOP package rated for –40°C to +85°C operation.
For engineers reviewing the TPS3306-18DGKR datasheet, TPS3306-18DGKR pinout, TPS3306-18DGKR application, or TPS3306-18DGKR equivalent, key selection criteria include dual-threshold voltage supervision (2.93 V / 1.68 V), ultra-low 15 µA supply current, defined RESET assertion down to VDD ≥ 1.1 V, and compatibility with battery-powered and automotive-qualified systems via the TPS3306-Q1 variant.
Technical Context
The TPS3306-18DGKR implements two independent voltage comparators with fixed thresholds (2.93 V on SENSE1, 1.68 V on SENSE2) referenced to an internal 1.25 V bandgap, each with ~15 mV hysteresis. Its watchdog logic triggers RESET upon WDI inactivity exceeding 0.8 s, with edge-triggered retriggering (low-to-high or high-to-low transitions).
Power-fail detection uses a separate PFI input compared against the same 1.25 V reference, driving an open-drain PFO output; RESET remains active during VDD < 1.1 V or either SENSE input falling below its threshold, with propagation delays under 5 µs and guaranteed timing over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SENSE1 Threshold | 2.93 V typical - monitors 3.3 V rail with 2.93 V trip point and 15 mV hysteresis for noise immunity |
| SENSE2 Threshold | 1.68 V typical - monitors 1.8 V rail with 1.68 V trip point and 15 mV hysteresis |
| RESET Delay Time | 100 ms typical - ensures reliable system initialization after both supplies stabilize above thresholds |
| Watchdog Timeout | 0.8 s typical - detects software lockup in microcontroller/DSP systems without external timing components |
| Supply Current | 15 µA typical at 2.7–6 V - enables use in always-on, low-power battery applications |
| Operating Temp | –40°C to +85°C - supports industrial and automotive ambient conditions without derating |
| VDD Range | 2.7 V to 6 V - powers from single Li-ion or regulated 3.3 V/5 V supplies |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 0.65 mm lead pitch, 1.1 mm max height, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SENSE1 | Voltage sense input 1 | Monitors primary supply (e.g., 3.3 V); asserts RESET if voltage drops below 2.93 V |
| 2 - SENSE2 | Voltage sense input 2 | Monitors secondary supply (e.g., 1.8 V); asserts RESET if voltage drops below 1.68 V |
| 3 - PFI | Power-fail comparator input | External resistor divider input for custom voltage monitoring (e.g., battery or auxiliary rail) |
| 4 - GND | Analog/digital ground | Common reference for all comparators and outputs; must be low-impedance connection |
| 5 - RESET | Active-low open-drain reset output | Drives system reset line; requires external pull-up; asserted when any fault condition occurs |
| 6 - PFO | Active-low open-drain power-fail output | Independent warning signal for PFI events; does not affect RESET state |
| 7 - WDI | Watchdog timer input | Edge-triggered input; toggling within 0.8 s prevents RESET assertion |
| 8 - VDD | Supply voltage input | Power source for internal circuitry; RESET active down to VDD = 1.1 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneous monitoring of 3.3 V and 1.8 V rails with fixed, factory-trimmed thresholds eliminates external resistor networks |
| Integrated watchdog timer | 0.8 s timeout with edge-triggered WDI allows fail-safe recovery without external RC timing components |
| Open-drain RESET and PFO outputs | Enables wired-OR configuration with other supervisors and flexible voltage-level translation via external pull-ups |
| Ultra-low quiescent current | 15 µA typical enables >10-year battery life in coin-cell–powered instrumentation and portable devices |
| Defined RESET behavior at low VDD | Guaranteed RESET assertion down to VDD = 1.1 V ensures robust power-down sequencing and brownout protection |
Applications
| Industrial PLC Controller | Automotive Infotainment Head Unit |
|---|---|
Use Scenario: Dual-rail FPGA or microcontroller system powered by 3.3 V I/O and 1.8 V core supplies, operating in variable-temperature factory environments. IC Role / Device Role / Timing Role: Supervises both rails independently, asserts RESET if either drops out, and provides watchdog safety for firmware execution. Use Value: Prevents undefined logic states during power transients and recovers from software hangs without manual intervention. | Use Scenario: Infotainment SoC with 3.3 V peripherals and 1.8 V memory interface, subject to automotive load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Monitors main and auxiliary supplies, generates early PFO warning before battery sag triggers system shutdown. Use Value: Enables graceful save-and-shutdown sequence prior to complete power loss, preserving user data and settings. |
| Portable Medical Monitor | Smart Energy Meter |
Use Scenario: Battery-operated ECG monitor with ultra-low-power MCU and analog front-end, requiring long shelf life and reliable startup. IC Role / Device Role / Timing Role: Provides power-on reset and watchdog supervision while consuming only 15 µA, extending battery runtime. Use Value: Eliminates need for discrete reset IC + external watchdog, reducing BOM count and PCB area in space-constrained designs. | Use Scenario: M-Bus–enabled electricity meter with isolated 3.3 V communication rail and 1.8 V metrology ASIC supply. IC Role / Device Role / Timing Role: Supervises isolated DC-DC outputs and triggers PFO to alert host MCU of impending power failure during mains outage. Use Value: Supports accurate last-read storage and secure shutdown before backup capacitor depletes, meeting IEC 62056 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3306-18DR | Same electrical specs; SOIC-8 (D) package instead of VSSOP-8 (DGK), 6.4 mm × 5.2 mm vs. 3.0 mm × 3.0 mm footprint | Preferred for through-hole prototyping or legacy board layouts where VSSOP rework is impractical | Select TPS3306-18DR when board space is less constrained and hand-soldering or socketing is required. |
| MAX6816EUT+T | Single-supply supervisor (3.3 V only), no SENSE2 or PFI inputs; 1.6 V threshold, 200 ms reset delay, 1.5 µA supply current | Lacks dual-rail capability and watchdog - suitable only for simpler, single-rail systems with extreme ultra-low-power needs | Choose MAX6816EUT+T only when supervising one rail and sub-2 µA current is mandatory; not a functional replacement for TPS3306-18DGKR. |
Compared with TPS3306-18DR, the TPS3306-18DGKR offers 60% smaller PCB area and improved thermal performance in dense layouts; versus MAX6816EUT+T, it delivers essential dual-supply monitoring and watchdog functionality at the cost of higher quiescent current - making it the only viable option for 3.3 V/1.8 V DSP systems requiring full feature parity.
Availability
TPS3306-18DGKR is available at Aetrix Electronics and suitable for industrial control, automotive infotainment, portable medical devices, smart energy meters, and battery-backed instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TPS3306-18DGKR 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 personal electronics markets.
The TPS3306 family was engineered specifically for dual-rail DSP and processor systems - enabling simultaneous, independent supervision of I/O and core supplies without external resistors or timing components.
FAQ
What is the exact SENSE1 and SENSE2 threshold voltage for TPS3306-18DGKR?
The TPS3306-18DGKR has a nominal SENSE1 threshold of 2.93 V (for 3.3 V rail monitoring) and a nominal SENSE2 threshold of 1.68 V (for 1.8 V rail monitoring), both with ±3% tolerance over temperature and supply voltage. These values are factory-trimmed and specified in Table 1 of the SLVS290C datasheet.
Does TPS3306-18DGKR require external components to operate?
No, the TPS3306-18DGKR operates autonomously with no external resistors or capacitors required for basic supervision. Only a 0.1 µF bypass capacitor on VDD is recommended per datasheet Figure 2; PFI resistor dividers and pull-up resistors on RESET/PFO are optional and application-dependent.
Can the watchdog timer in TPS3306-18DGKR be disabled?
Yes, the watchdog timer in TPS3306-18DGKR is automatically disabled when the WDI pin is left unconnected or held at high impedance. No configuration register or strap pin is needed - the device defaults to watchdog-off mode unless actively toggled.
What package type is used by TPS3306-18DGKR and what are its dimensions?
The TPS3306-18DGKR 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 leads. Pin 1 orientation follows JEDEC MO-187 standard with quadrant Q1 tape placement.
Is TPS3306-18DGKR qualified for automotive applications?
The TPS3306-18DGKR itself is not AEC-Q100 qualified; however, the pin-compatible automotive-grade variant TPS3306-18Q1 is available. That part undergoes extended temperature testing (–40°C to +125°C), enhanced reliability screening, and is intended for infotainment, ADAS, and body electronics systems.
TPS3306-18DGKR 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:
- 1.68V, 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
TPS3306-18DGKR FAQ
1.How can I place an order for TPS3306-18DGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3306-18DGKR 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 TPS3306-18DGKR reliable?
The price and inventory of TPS3306-18DGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3306-18DGKR is usually 5 days.
3.What payment methods are accepted for TPS3306-18DGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3306-18DGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3306-18DGKR?
TPS3306-18DGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3306-18DGKR 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 TPS3306-18DGKR?
For technical support, including TPS3306-18DGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3306-18DGKR requirements.
6.How does Aetrix verify that TPS3306-18DGKR is sourced from the original manufacturer or authorized distributors?
All TPS3306-18DGKR 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 TPS3306-18DGKR meets industry standards.
7.What is the process for return or replacement of TPS3306-18DGKR?
All TPS3306-18DGKR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3306-18DGKR, 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 TPS3306-18DGKR part is unused and in its original packaging.
Return procedure for TPS3306-18DGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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