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Texas Instruments TPS3305-33DGN
- Part No.:
- TPS3305-33DGN
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
TPS3305-33DGN.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:116
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Product details
Overview
TPS3305-33DGN from Texas Instruments is a dual-voltage supervisor IC designed for DSP- and processor-based systems requiring independent monitoring of core (3.3 V) and I/O (5.0 V) rails. It provides fixed 200 ms power-on reset delay, watchdog timeout of 1.6 s (typ), ±40 µA supply current, and operates from 2.7 V to 6 V over –40°C to +85°C - used in industrial embedded controllers with dual-rail power sequencing.
For engineers reviewing the TPS3305-33DGN datasheet, TPS3305-33DGN pinout, TPS3305-33DGN application, or TPS3305-33DGN equivalent, key selection criteria include dual-sense threshold accuracy (4.55 V / 2.93 V typ), active-low and active-high RESET outputs, MR/WDI timing compatibility, and HVSSOP-8 thermal performance in space-constrained designs.
Technical Context
The TPS3305-33DGN integrates two independent voltage sense comparators with temperature-compensated 1.25 V reference, hysteresis (40 mV at 4.55 V input), and logic-controlled reset generation. Its watchdog timer monitors WDI toggling with 1.6 s timeout (typ), while MR asserts RESET asynchronously with 200 ns propagation delay.
Reset assertion occurs when either SENSE1 falls below 4.55 V (typ) or SENSE2 falls below 2.93 V (typ); both must exceed thresholds and remain stable for 200 ms before deassertion. The device supports simultaneous monitoring of 5 V I/O and 3.3 V core supplies without external capacitors or resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supervised Voltages | SENSE1: 5.0 V nominal (4.55 V threshold typ); SENSE2: 3.3 V nominal (2.93 V threshold typ) |
| Reset Delay Time | 200 ms typ - factory-programmed, no external capacitor required for power-on sequencing |
| Watchdog Timeout | 1.6 s typ - ensures system recovery if firmware fails to toggle WDI within interval |
| Supply Current | 40 µA max - enables use in battery-backed or ultra-low-power industrial monitoring |
| Operating Voltage Range | 2.7 V to 6.0 V - supports wide-input auxiliary supplies and brownout resilience |
| Temperature Range | –40°C to +85°C - qualified for industrial equipment and automotive under-hood control modules |
| Output Types | Active-low RESET (pin 5) and active-high RESET (pin 6) - simplifies interface to diverse host logic families |
Pinout & Package
HVSSOP-8 (DGN) package: 3.0 mm × 3.0 mm, 0.65 mm pitch, 1.1 mm max height, exposed thermal pad (Pin 9) for enhanced thermal dissipation in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1 (Pin 1) | Voltage monitor input 1 | Monitors 5.0 V rail; asserts RESET if voltage drops below 4.55 V (typ) with 40 mV hysteresis |
| SENSE2 (Pin 2) | Voltage monitor input 2 | Monitors 3.3 V rail; asserts RESET if voltage drops below 2.93 V (typ) with 30 mV hysteresis |
| WDI (Pin 3) | Watchdog timer input | Requires ≥1.6 s toggling interval; failure triggers RESET independently of SENSE inputs |
| GND (Pin 4) | Ground reference | Common return for all analog and digital circuitry; connects to exposed thermal pad |
| RESET (Pin 5) | Active-low reset output | Drives low during fault or reset initiation; sinks up to 5 mA for direct MCU reset pin drive |
| RESET (Pin 6) | Active-high reset output | Drives high during fault; compatible with logic families requiring high-active reset signaling |
| MR (Pin 7) | Manual reset input | Pulled high internally; driven low externally to force immediate reset regardless of SENSE/WDI state |
| VDD (Pin 8) | Supply voltage input | Power source for internal circuitry; functional down to 1.1 V for early-reset capability during brownout |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneous monitoring of 5.0 V and 3.3 V rails with separate thresholds and hysteresis - eliminates need for two discrete supervisors |
| Fixed 200 ms reset delay | No external RC network required - reduces BOM count and layout area in cost-sensitive industrial controls |
| Integrated watchdog timer | 1.6 s timeout (typ) with dedicated WDI pin - provides fail-safe recovery for locked-up DSP/processor firmware |
| Low quiescent current | 40 µA max across full temperature range - extends battery life in portable test equipment and remote sensors |
| Wide supply voltage operation | 2.7 V to 6.0 V input range - supports direct connection to unregulated 5 V or buck-converted 3.3 V supplies |
| Reset output polarity options | Both active-low and active-high RESET outputs on separate pins - avoids level-shifting or inverters in mixed-logic systems |
Applications
| Industrial PLC Controller | DSP-Based Motor Drive |
|---|---|
Use Scenario: Dual-rail power sequencing in programmable logic controller CPU module with 5 V I/O and 3.3 V ARM Cortex-M4 core. IC Role / Device Role / Timing Role: Monitors both rails, asserts synchronized reset if either fails, and enforces 200 ms hold time before release. Use Value: Prevents partial initialization and metastability during cold start or brownout recovery. | Use Scenario: Real-time safety monitoring in servo drive where DSP firmware must respond to position feedback within strict deadlines. IC Role / Device Role / Timing Role: WDI input tied to DSP GPIO; watchdog timeout forces hardware reset if motion control loop stalls. Use Value: Guarantees deterministic recovery from software hang without relying on software-based timeouts. |
| Automotive Body Control Module | Networked Sensor Gateway |
Use Scenario: Power management in under-dash BCM with 5 V CAN transceiver and 3.3 V microcontroller supply. IC Role / Device Role / Timing Role: SENSE1 monitors 5 V CAN bus supply; SENSE2 tracks 3.3 V MCU rail; MR pin linked to ignition switch for cold-boot reset. Use Value: Ensures reliable startup after vehicle ignition cycle and prevents CAN communication faults due to undervoltage. | Use Scenario: Battery-powered wireless sensor node aggregating data from multiple analog sensors before transmission. IC Role / Device Role / Timing Role: Supervises 3.3 V LDO output powering MCU and RF transceiver; uses low IDD to minimize sleep-mode current draw. Use Value: Extends operational lifetime by >15% versus discrete supervisor solutions due to 40 µA quiescent current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3305-33D | Same electrical specs; SOIC-8 (4.9 mm × 3.9 mm) vs HVSSOP-8 (3.0 mm × 3.0 mm) | Less suitable for high-density PCBs; higher thermal resistance (725 mW vs 2.14 W) | Select TPS3305-33D only when legacy SOIC footprint compatibility is required. |
| MAX6816EUT+T | Single-supply supervisor (3.3 V only); no watchdog or dual-sense capability; 1.6 µA ICC | Cannot replace dual-rail monitoring function; requires additional circuitry for 5 V supervision | Use only for simple 3.3 V-only systems where watchdog and second rail monitoring are unnecessary. |
Compared with TPS3305-33D, the TPS3305-33DGN offers 70% smaller footprint and 3× better thermal performance; compared with MAX6816EUT+T, it delivers full dual-rail supervision and watchdog functionality essential for DSP-based real-time systems.
Availability
TPS3305-33DGN is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and portable instrumentation requiring stable component supply and long-term manufacturability.
Supply support for TPS3305-33DGN 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 over 50 years of innovation in industrial and automotive electronics.
The TPS3305 family was engineered specifically for dual-rail power sequencing in DSP- and microprocessor-based systems, addressing the need for accurate, low-power, and space-efficient voltage supervision in resource-constrained embedded platforms.
FAQ
What is the exact voltage threshold for SENSE1 on the TPS3305-33DGN?
The TPS3305-33DGN has a nominal SENSE1 threshold of 4.55 V (typical), with min/max values of 4.46 V and 4.64 V over temperature (–40°C to +85°C). This threshold is factory-trimmed and applies specifically to the TPS3305-33DGN variant, which supervises a 5.0 V rail. The TPS3305-33DGN does not support adjustable thresholds - all variants use fixed internal resistor dividers.
Does the TPS3305-33DGN require an external capacitor for its 200 ms reset delay?
No, the TPS3305-33DGN uses an internal oscillator and timer to generate its 200 ms (typical) power-on reset delay - no external capacitor is needed. This is confirmed in the datasheet's "Features" section and Electrical Characteristics table (td = 140–280 ms). The TPS3305-33DGN achieves this with monolithic integration, reducing board area and component count versus RC-based alternatives.
Can the TPS3305-33DGN monitor a 3.3 V rail and a 1.8 V rail simultaneously?
No - the TPS3305-33DGN is configured for 5.0 V and 3.3 V rails only, with fixed thresholds of 4.55 V and 2.93 V (typ). For 1.8 V supervision, TI offers the TPS3305-18 variant (thresholds 2.93 V / 1.68 V). The TPS3305-33DGN's internal resistor network is laser-trimmed per variant; mixing rail voltages outside its specified range violates datasheet operating conditions.
What is the maximum sink current capability of the active-low RESET output on the TPS3305-33DGN?
The active-low RESET output (Pin 5) of the TPS3305-33DGN can sink up to 5 mA while maintaining VOL ≤ 0.4 V (at VDD = 6 V, IOL = 3 mA). This is sufficient to directly drive standard CMOS reset inputs without external pull-up resistors. The TPS3305-33DGN datasheet specifies IOL = 5 mA as the absolute maximum low-output current rating.
Is the exposed thermal pad (Pin 9) on the TPS3305-33DGN electrically connected internally?
Yes - the exposed thermal pad (Pin 9) on the TPS3305-33DGN is internally connected to GND and must be soldered to a PCB ground plane for optimal thermal performance and EMI reduction. TI's DGN package documentation confirms this connection, and the recommended board layout shows the pad tied to GND via multiple vias. Failure to connect the TPS3305-33DGN thermal pad may cause junction temperature rise beyond rated limits.
TPS3305-33DGN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, 4.55V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-HVSSOP
TPS3305-33DGN FAQ
1.How can I place an order for TPS3305-33DGN through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3305-33DGN 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 TPS3305-33DGN reliable?
The price and inventory of TPS3305-33DGN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3305-33DGN is usually 5 days.
3.What payment methods are accepted for TPS3305-33DGN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3305-33DGN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3305-33DGN?
TPS3305-33DGN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3305-33DGN 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 TPS3305-33DGN?
For technical support, including TPS3305-33DGN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3305-33DGN requirements.
6.How does Aetrix verify that TPS3305-33DGN is sourced from the original manufacturer or authorized distributors?
All TPS3305-33DGN 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 TPS3305-33DGN meets industry standards.
7.What is the process for return or replacement of TPS3305-33DGN?
All TPS3305-33DGN units undergo pre-shipment inspection (PSI). If there is an issue with TPS3305-33DGN, 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 TPS3305-33DGN part is unused and in its original packaging.
Return procedure for TPS3305-33DGN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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