UC3871QG3 Texas Instruments Integrated Circuit (Plastic Leaded Chip Carrier) In Stock
The UC3871QG3 is a current-mode PWM resonant fluorescent lamp driver controller IC from Texas Instruments operating from 4.5 V to 20 V supply. It provides up to 100 mA output drive current with integrated pulse width modulation control for efficient lamp dimming and regulation. Housed in a 20-pin PLCC package for surface-mount industrial display and lighting applications.
- Manufacturer
- Texas Instruments
- Package
- Plastic Leaded Chip Carrier
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- UC3871QG3 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Current-mode PWM control provides inherent cycle-by-cycle peak current limiting for stable fluorescent lamp regulation
- Wide 4.5 V to 20 V input voltage range accommodates diverse power supply environments from battery to mains-derived supplies
- Resonant converter control topology enables high-efficiency lamp driving with reduced EMI and lamp electrode stress
- 20-pin PLCC package (JESD-30 S-PQCC-J20) is suitable for compact surface-mount fluorescent lamp ballast designs
Applications
The UC3871QG3 is used as the primary control IC in resonant fluorescent lamp ballasts for LCD backlighting in monitors, industrial HMI displays, and signage equipment where precise brightness control is required. Its current-mode PWM architecture efficiently drives cold cathode fluorescent lamps (CCFL) and similar discharge tubes in both single-lamp and multi-lamp configurations. The wide supply voltage range also makes it applicable in 12 V to 20 V automotive and industrial display systems requiring reliable fluorescent lamp regulation.
Specifications
| YTEOL | 0 |
| Analog IC - Other Type | FLUORESCENT LIGHT CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 20V |
| Input Voltage-Min | 4.5V |
| Input Voltage-Nom | 5V |
| JESD-30 Code | S-PQCC-J20 |
| Number of Functions | 1 |
| Output Current-Max | 0.1A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | LDCC20,.4SQ |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Qualification Status | Not Qualified |
| Screening Level | TS 16949 |
| Supply Current-Max (Isup) | 12mA |
| Surface Mount | YES |
| Switcher Configuration | PUSH-PULL |
| Switching Frequency-Max | 78kHz |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| Terminal Form | J BEND |
| Terminal Pitch | 1.27mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Package | Plastic Leaded Chip Carrier |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What type of control does the UC3871QG3 use to regulate fluorescent lamps?
The UC3871QG3 uses current-mode pulse width modulation (PWM) control to regulate fluorescent lamp current and brightness. In current-mode control, the peak inductor or switch current is directly sensed and compared against a reference each cycle, providing inherent cycle-by-cycle overcurrent protection and faster transient response compared to voltage-mode PWM, which improves lamp regulation stability and ballast efficiency.
What is the supply voltage range of the UC3871QG3?
The UC3871QG3 operates from a supply voltage range of 4.5 V to 20 V, with a nominal design target of 5 V. This wide range allows the device to be powered from standard 5 V logic supplies as well as higher-voltage auxiliary rails in 12 V or 19 V industrial and computing systems, without requiring additional voltage regulation stages dedicated to the lamp controller.
What is the maximum output current of the UC3871QG3 and what does it drive?
The UC3871QG3 provides a maximum output current of 100 mA. This current is used to drive the gates of external power MOSFETs or bipolar transistors in the resonant inverter stage of the fluorescent lamp ballast circuit. The external power stage then amplifies this drive to supply the high-voltage resonant current required by the fluorescent or CCFL lamp. The 100 mA gate drive capability is sufficient for most MOSFET choices in compact ballast designs.
What package does the UC3871QG3 come in?
The UC3871QG3 is housed in a 20-pin Plastic Leaded Chip Carrier (PLCC) package, JESD-30 code S-PQCC-J20. PLCC is a square surface-mount package with J-shaped leads on all four sides, which provides reliable solder joints and allows for socket mounting during prototyping. This package is common in industrial electronics where component replaceability and robust mounting are priorities.
In which applications is the UC3871QG3 most commonly used?
The UC3871QG3 is primarily used in fluorescent lamp ballast circuits for CCFL backlighting in LCD panels, industrial display screens, and signage. Its resonant converter control with current-mode PWM makes it suitable for driving cold cathode fluorescent lamps in laptop displays, medical imaging monitors, and factory HMI terminals where stable dimming over a wide brightness range is required. It is also applied in architectural lighting controllers and copier/scanner lamp assemblies.
Related Guides
SN74LVC14APWR Hex Schmitt-Trigger Inverter: Application Note and Design Guide
Complete design guide for the SN74LVC14APWR hex Schmitt-trigger inverter: thresholds, decoupling, oscillator design, package selection, and common pitfalls.
May 21, 2026
TPS62841DGRR Buck Converter Selection Guide: Ultra-Low 60 nA IQ for Battery-Powered IoT
How to choose the right TPS62841 variant for IoT, wearables, and wireless sensors: quiescent current, voltage range, package, and application examples.
May 21, 2026
TPS54160DGQR Selection Guide: How to Choose a 60V Step-Down Buck Converter
Complete selection guide for the TPS54160DGQR 60V/1.5A step-down converter. Compare specs, alternatives, and sourcing options for industrial and automotive designs.
May 20, 2026
LMV932MM Dual Low-Voltage CMOS Op-Amp: Application Design Guide
Complete application design guide for the LMV932MM dual rail-to-rail CMOS op-amp: supply decoupling, RRIO design rules, stability, and recommended circuits for 1.8V–5.5V battery-powered systems.
May 20, 2026
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
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“FindMyChip sourced our entire STM32 BOM in 48 hours when our usual distributor had 16-week lead times.”