UCC3813N-2G4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
UCC3813N-2G4 is a low-power economy BiCMOS current-mode PWM controller in an 8-pin PDIP package, operating from a 9.3 V to 12 V supply with programmable oscillator frequency for cost-sensitive switching power supply designs. It features cycle-by-cycle current limiting, soft-start, and output disable for flyback and forward converter applications.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- UCC3813N-2G4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of UCC3813N-2G4?
- Current-mode PWM control with cycle-by-cycle current limiting
- Low-power BiCMOS design minimizing standby and operating supply current
- Input voltage range 9.3 V to 12 V nominal 10 V operation
- Programmable oscillator frequency via external R and C components
- Soft-start control to reduce startup inrush current
- Output disable function for fault protection and burst-mode operation
- 8-pin PDIP through-hole package for prototype and cost-optimized production boards
- Economy-grade pricing for high-volume consumer power supply applications
What is UCC3813N-2G4 used for?
UCC3813N-2G4 is used in cost-optimized offline flyback and forward DC-DC converter designs for consumer electronics, set-top boxes, and desktop adapter power supplies where low component count and economy pricing are priorities. The current-mode architecture with programmable oscillator suits isolated power supply designs in the 5 W to 50 W range requiring stable regulation and current-limit protection. It also finds use in industrial bench power supplies and white-goods auxiliary power circuits powered from regulated 10 V bias rails.
What are the specifications of UCC3813N-2G4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 12V |
| Input Voltage-Min | 9.3V |
| Input Voltage-Nom | 10V |
| JESD-30 Code | R-PDIP-T8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Output Voltage-Max | 5.075V |
| Output Voltage-Min | 4.925V |
| Output Voltage-Nom | 5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 30mA |
| Supply Voltage-Max (Vsup) | 12V |
| Supply Voltage-Nom (Vsup) | 10V |
| Surface Mount | NO |
| Switcher Configuration | BUCK-BOOST |
| Switching Frequency-Max | 52kHz |
| Technology | BICMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the UCC3813N-2G4 datasheet?
UCC3813N-2G4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for UCC3813N-2G4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Over what input voltage range does UCC3813N-2G4 operate, and what is its nominal supply voltage?
UCC3813N-2G4 operates from a minimum of 9.3 V to a maximum of 12 V, with a nominal design point of 10 V. This range aligns with the bias supply voltage commonly generated in offline flyback converter auxiliary windings, making it a direct replacement in many existing UC3842 or UC3843 compatible power supply designs.
How does the current-mode control of UCC3813N-2G4 protect the converter during overload conditions?
Cycle-by-cycle current limiting monitors the peak inductor or switch current each switching period and terminates the PWM pulse immediately when the current threshold is exceeded, preventing transformer saturation. Combined with the soft-start function that gradually ramps the duty cycle over several milliseconds at power-up, UCC3813N-2G4 limits stress on switching transistors in 10 V to 12 V bias-powered flyback converters.
Can the switching frequency of UCC3813N-2G4 be customized for different transformer designs?
Yes, the oscillator frequency is set by external resistor and capacitor values on the RT and CT pins, allowing designers to select frequencies from tens of kilohertz up to several hundred kilohertz. Choosing a higher switching frequency reduces transformer core size and filter capacitor values in consumer adapter and set-top box power supply designs operating from a 10 V bias rail.
What package does UCC3813N-2G4 use, and is it suitable for prototype breadboard development?
The device uses an 8-pin PDIP (Plastic Dual Inline Package) with 2.54 mm through-hole pin pitch, which inserts directly into standard breadboards and DIP sockets for rapid prototyping of flyback or forward converter power stages. This through-hole format also supports low-volume hand-soldered production boards in industrial and laboratory power supply applications.
When would a designer choose UCC3813N-2G4 over the higher-performance UCC1805 variant?
A designer selects UCC3813N-2G4 for cost-sensitive consumer products where the economy-grade pricing and 9.3 V to 12 V supply range are sufficient, and military qualification is not required. The UCC1805 is preferred for MIL-STD-883 qualified aerospace and defense applications requiring hermetic ceramic packages and wider environmental screening, while UCC3813N-2G4 targets high-volume adapter and household appliance power supplies at lower cost.
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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.
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