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Texas Instruments TPS3306-18DGK
- Part No.:
- TPS3306-18DGK
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3306-18DGK.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:289
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Product details
Overview
TPS3306-18DGK 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 operates across –40°C to +85°C in an 8-pin VSSOP package.
For engineers reviewing the TPS3306-18DGK datasheet, TPS3306-18DGK pinout, TPS3306-18DGK application, or TPS3306-18DGK equivalent, this page delivers verified specifications, functional context, real-world use cases, and validated alternative options - all grounded in TI's SLVS290C datasheet and official packaging documentation.
Technical Context
The TPS3306-18DGK implements two independent voltage comparators with fixed thresholds: 2.93 V (typ) for SENSE1 (3.3 V rail) and 1.68 V (typ) for SENSE2 (1.8 V rail), each with ~15 mV hysteresis. It features a dedicated PFI input referenced to an internal 1.25 V bandgap, enabling flexible external voltage supervision via resistor dividers.
Its watchdog logic responds to any WDI transition (rising or falling edge) within 0.8 s to prevent timeout; leaving WDI unconnected disables the watchdog. RESET asserts low when VDD ≥1.1 V and remains active until both SENSE inputs exceed their thresholds, followed by a guaranteed 100 ms (70–140 ms) delay before deassertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supervised Voltages | 3.3 V (SENSE1) and 1.8 V (SENSE2) nominal rails - enables dual-rail initialization in mixed-voltage DSP/microcontroller systems |
| SENSE1 Threshold | 2.93 V (typ), 2.86–3.02 V (min/max over temp) - ensures reliable detection of 3.3 V supply drop below 2.93 V |
| SENSE2 Threshold | 1.68 V (typ), 1.64–1.73 V (min/max over temp) - matches 1.8 V rail tolerance for accurate low-voltage detection |
| Reset Delay Time | 100 ms (typ), 70–140 ms (min/max) - provides sufficient hold time for stable CPU core and peripheral initialization |
| Watchdog Timeout | 0.8 s (typ), 0.5–1.2 s (min/max) - balances fault coverage and software execution margin in embedded firmware loops |
| Supply Current | 15 µA (typ), ≤40 µA (max) - supports ultra-low-power operation in battery-backed or energy-constrained systems |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive-adjacent embedded applications without derating |
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 present. 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 I/O rail); threshold = 2.93 V (typ) |
| 2 - SENSE2 | Voltage sense input 2 | Monitors secondary supply (e.g., 1.8 V core rail); threshold = 1.68 V (typ) |
| 3 - PFI | Power-fail comparator input | Accepts externally divided voltage; compared to 1.25 V internal reference for auxiliary supply monitoring |
| 4 - GND | Ground reference | Common return for all analog and digital circuitry; must be low-impedance connection |
| 5 - RESET | Active-low open-drain reset output | Drives system reset line low during power-up, brownout, or watchdog timeout; requires external pull-up |
| 6 - PFO | Active-low open-drain power-fail output | Signals auxiliary supply failure (e.g., battery low); independent of RESET assertion timing |
| 7 - WDI | Watchdog timer input | Edge-triggered (rising/falling); toggling within 0.8 s prevents reset; floating disables watchdog |
| 8 - VDD | Supply voltage input | Operates from 2.7 V to 6 V; RESET activates at VDD ≥1.1 V; powers internal comparators and logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneous monitoring of 3.3 V and 1.8 V rails eliminates need for two discrete supervisors - reduces BOM count and PCB area |
| Integrated 100 ms power-on reset generator | Guaranteed minimum delay ensures reliable CPU and peripheral initialization without external RC timing components |
| Configurable watchdog timer (0.8 s timeout) | Software-controllable via WDI pin; supports fail-safe recovery in locked-up firmware without hardware modification |
| Separate open-drain PFO output | Enables early warning of auxiliary supply collapse (e.g., backup battery depletion) while RESET remains inactive |
| Low quiescent current (15 µA typ) | Minimizes impact on system standby power budget - critical for portable and always-on embedded devices |
Applications
| Industrial PLC Controller | Automotive Infotainment Head Unit |
|---|---|
Use Scenario: Dual-rail power sequencing for ARM Cortex-A8 SoC (3.3 V I/O, 1.8 V core) with battery-backed RTC and CAN interface. IC Role / Device Role / Timing Role: Supervises both rails independently; asserts RESET only when both are stable; triggers PFO on 12 V main supply sag. Use Value: Prevents partial initialization and bus contention during cold crank; enables graceful shutdown upon battery voltage decay. |
Use Scenario: Power management in head unit with separate 3.3 V display interface and 1.8 V audio DSP supply. IC Role / Device Role / Timing Role: Generates synchronized reset pulse after both supplies reach regulation; monitors 5 V USB input via PFI for accessory detection. Use Value: Eliminates display flicker and audio pop during power transitions; allows firmware to distinguish between cold boot and USB wake event. |
| Portable Medical Monitor | Network Edge Router Control Card |
Use Scenario: Battery-powered ECG monitor with 3.3 V MCU and 1.8 V ADC/PGA signal chain. IC Role / Device Role / Timing Role: Detects brownout on either rail; uses WDI to verify firmware health; asserts PFO for low-battery alert to LCD controller. Use Value: Ensures clinical data integrity by halting acquisition before supply collapse; extends usable battery life via early warning. |
Use Scenario: Dual-supply control card (3.3 V FPGA config, 1.8 V transceiver core) in carrier-grade router with hot-swap capability. IC Role / Device Role / Timing Role: Monitors pre-charge and post-insertion voltages; holds RESET until both rails stabilize; isolates PFO from main reset path. Use Value: Prevents FPGA configuration corruption during hot-swap insertion; enables independent power-fail logging without resetting management CPU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3306-18D | Same electrical specs and functionality; SOIC-8 (D) package instead of VSSOP-8 (DGK) - 3.9 mm × 4.9 mm vs. 3.0 mm × 3.0 mm footprint | Preferred where board space is less constrained and hand-soldering or legacy layout compatibility is required | Select TPS3306-18D for through-hole prototyping or higher thermal mass needs; DGK offers 40% smaller area and finer pitch. |
| TPS3808G18 | Single-supply supervisor (1.8 V only); no SENSE2, PFI, or dual-rail capability; 1.2 V to 6.5 V input range; 35 µA typical supply current | Only suitable for 1.8 V-only systems; lacks watchdog, PFO, and second sense channel - cannot replace dual-monitoring function | Choose TPS3808G18 only if supervising one rail and needing tighter 1.8 V threshold accuracy (±0.5% vs. ±1.2% for TPS3306-18DGK). |
Compared with TPS3306-18D, the TPS3306-18DGK saves PCB area and improves high-frequency noise immunity due to shorter trace lengths; compared with TPS3808G18, it provides essential dual-rail coordination and auxiliary monitoring - making it irreplaceable in mixed-voltage DSP platforms.
Availability
TPS3306-18DGK is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive infotainment systems, and portable medical monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for TPS3306-18DGK 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 expertise in high-reliability supervisory circuits.
The TPS3306 family was engineered specifically for dual-rail initialization in DSP and microprocessor systems - addressing the need for coordinated reset timing, independent voltage monitoring, and integrated watchdog protection in space-constrained designs.
FAQ
What is the exact SENSE2 threshold voltage for TPS3306-18DGK?
The TPS3306-18DGK has a nominal SENSE2 threshold of 1.68 V (typical), with a guaranteed range of 1.64 V (min) to 1.73 V (max) across –40°C to +85°C. This value is factory-trimmed and applies specifically to the TPS3306-18DGK variant - not extrapolated from other members of the TPS3306 family.
Can TPS3306-18DGK supervise a 5 V supply?
No - the TPS3306-18DGK is configured exclusively for 3.3 V / 1.8 V dual-rail supervision. Its SENSE1 threshold is fixed at 2.93 V and SENSE2 at 1.68 V. To monitor 5 V, use TPS3306-33DGK (4.55 V / 2.93 V thresholds) or repurpose the PFI input with an external resistor divider referenced to the 1.25 V internal bandgap.
Does TPS3306-18DGK require external components for basic operation?
Yes - TPS3306-18DGK requires external pull-up resistors on RESET and PFO (open-drain outputs), a 0.1 µF ceramic bypass capacitor on VDD, and optionally two 1% resistors on PFI for auxiliary voltage monitoring. No external timing components are needed for reset delay or watchdog function - both are fully integrated.
What is the maximum supply voltage rating for TPS3306-18DGK?
The absolute maximum VDD rating for TPS3306-18DGK is 7 V, but the recommended operating range is 2.7 V to 6 V. Continuous operation above 6 V is not advised; TI specifies that 7 V may be applied for ≤1000 hours total lifetime. Exceeding 6 V risks parametric shift or premature wear-out.
Is TPS3306-18DGK pin-compatible with other TPS3306 variants?
Yes - all TPS3306-xxDGK variants (e.g., TPS3306-15DGK, TPS3306-25DGK) share identical VSSOP-8 (DGK) pinout, package dimensions, and terminal functions. Only the internal voltage thresholds differ; no PCB redesign is needed when switching between variants for different rail combinations.
TPS3306-18DGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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
TPS3306-18DGK FAQ
1.How can I place an order for TPS3306-18DGK through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3306-18DGK 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 TPS3306-18DGK reliable?
The price and inventory of TPS3306-18DGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3306-18DGK is usually 5 days.
3.What payment methods are accepted for TPS3306-18DGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3306-18DGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3306-18DGK?
TPS3306-18DGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3306-18DGK 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 TPS3306-18DGK?
For technical support, including TPS3306-18DGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3306-18DGK requirements.
6.How does Aetrix verify that TPS3306-18DGK is sourced from the original manufacturer or authorized distributors?
All TPS3306-18DGK 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 TPS3306-18DGK meets industry standards.
7.What is the process for return or replacement of TPS3306-18DGK?
All TPS3306-18DGK units undergo pre-shipment inspection (PSI). If there is an issue with TPS3306-18DGK, 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 TPS3306-18DGK part is unused and in its original packaging.
Return procedure for TPS3306-18DGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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