TPS3305-33DG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The TPS3305-33DG4 is a dual processor supervisor IC from Texas Instruments with watchdog timer, 4.55 V reset threshold, power-on reset generation, manual reset input, two supervision channels, and an 8-pin SOIC package for reliable microprocessor and DSP power supply monitoring.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- TPS3305-33DG4 Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.4500(MOQ 133)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of TPS3305-33DG4?
- Dual-channel supply voltage supervision for monitoring two independent rails
- Factory-set 3.3 V reset threshold at 4.55 V with tight tolerance
- Integrated watchdog timer with programmable timeout for processor fault detection
- Power-on reset (POR) generator ensures clean processor startup sequencing
- Manual reset input for external supervisory override
- 8-pin SOIC package for straightforward PCB integration
- Low quiescent current consumption for efficient standby monitoring
- Active-low RESET output for direct connection to MCU/DSP reset pins
What is TPS3305-33DG4 used for?
The TPS3305-33DG4 monitors 3.3 V and secondary supply rails in embedded processor systems, triggering reset pulses when voltages drop below safe thresholds to prevent firmware corruption or erratic MCU behavior. Its watchdog timer catches software lockups in industrial controllers, communication equipment, and automotive infotainment modules by asserting a system reset if the processor fails to toggle the watchdog within the timeout period. The dual-channel architecture allows a single device to supervise both the primary MCU supply and a secondary peripheral power rail simultaneously.
What are the specifications of TPS3305-33DG4?
| YTEOL | 0 |
| Additional Feature | RESET THRESHOLD IS 4.55V, POWER ON RESET GENERATOR |
| Adjustable Threshold | NO |
| Analog IC - Other Type | VOLTAGE SUPERVISOR/RESET IC |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Number of Channels | 2 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 0.04mA |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2.7V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Threshold Voltage-Nom | +2.93V |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Taiwan |
Where can I find the TPS3305-33DG4 datasheet?
TPS3305-33DG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for TPS3305-33DG4?
Compatible alternatives and drop-in replacements for TPS3305-33DG4:
Frequently Asked Questions
At what voltage threshold does TPS3305-33DG4 assert a reset, and why is this important for 3.3 V MCU reliability?
The TPS3305-33DG4 monitors the 3.3 V rail and asserts an active-low RESET when supply voltage drops below 4.55 V threshold (referenced internally for the -33 variant). This prevents the MCU from operating with degraded supply that could cause Flash corruption, SRAM bit errors, or unpredictable code execution — critical in safety-relevant systems like industrial automation and medical devices.
How does the watchdog timer in TPS3305-33DG4 protect against software lockups in embedded systems?
The TPS3305-33DG4 watchdog timer requires the MCU to periodically toggle the WDI (watchdog input) pin within a defined timeout window, typically 1.6 s. If the processor hangs in an infinite loop or enters an unrecoverable fault state and fails to toggle WDI in time, the watchdog asserts a RESET pulse to restart the system — providing automatic fault recovery without human intervention in remote or unattended deployments.
Can TPS3305-33DG4 monitor two separate supply rails simultaneously, and what does this enable in multi-rail designs?
Yes, the TPS3305-33DG4 provides 2 independent supervision channels that can monitor two different voltage rails, such as 3.3 V core and 5 V I/O supply. Both channels share a single RESET output, which asserts if either rail drops below its threshold. This eliminates the need for two separate supervisor ICs in dual-supply microprocessor boards, reducing BOM cost and PCB area.
For PCB integration in a compact embedded controller, how does the 8-pin SOIC package of TPS3305-33DG4 simplify board assembly?
The TPS3305-33DG4 8-pin SOIC package measures 5 mm x 4 mm with a 1.27 mm pin pitch, a widely supported footprint in standard PCB assembly lines. The package fits on 0.25-inch SOIC pads and is compatible with standard solder paste printing and reflow profiles, requiring no special tooling and enabling hand soldering for prototype builds alongside automated SMT production.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 133+ | $2.2600 | $300.58 |
| 500+ | $1.6300 | $815.00 |
| 1000+ | $1.5400 | $1540.00 |
| 10000+ | $1.4500 | $14500.00 |
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