UC1843AJ Texas Instruments Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
The UC1843AJ is a current-mode PWM controller from Texas Instruments designed for off-line and DC-DC switching power supply applications, featuring an 8.2–25 V input voltage range in a ceramic DIP-8 package. It integrates a precision reference, oscillator, and cycle-by-cycle current limiting for robust power conversion. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- UC1843AJ Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Current-mode control with cycle-by-cycle current limiting for inherent short-circuit protection and simplified loop compensation
- Wide input voltage range of 8.2 V to 25 V with 15 V nominal operation, ideal for offline flyback and forward converter designs
- Military-grade ceramic DIP-8 (CDIP) packaging offering enhanced reliability and vibration resistance for harsh-environment applications
Applications
The UC1843AJ is widely used in off-line flyback and forward converter power supplies operating from rectified mains voltage. Its current-mode control architecture makes it suitable for DC-DC converters requiring tight output voltage regulation and fast transient response. The ceramic DIP package makes it a preferred choice in military, aerospace, and high-reliability industrial power systems.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 25V |
| Input Voltage-Min | 8.2V |
| Input Voltage-Nom | 15V |
| JESD-30 Code | R-GDIP-T8 |
| JESD-609 Code | e0 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Output Voltage-Max | 5.05V |
| Output Voltage-Min | 4.95V |
| Output Voltage-Nom | 5V |
| Package Body Material | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 25mA |
| Supply Voltage-Max (Vsup) | 25V |
| Supply Voltage-Min (Vsup) | 12V |
| Supply Voltage-Nom (Vsup) | 11V |
| Surface Mount | NO |
| Switcher Configuration | BUCK-BOOST |
| Switching Frequency-Max | 500kHz |
| Technology | BIPOLAR |
| Temperature Grade | MILITARY |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for UC1843AJ:
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BICMOS, CDIP8
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, CDIP8
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, CDIP8
Frequently Asked Questions
What is the input voltage range of the UC1843AJ?
The UC1843AJ operates with an input voltage range of 8.2 V to 25 V, with a nominal operating voltage of 15 V. This range suits it for both off-line applications powered from rectified mains and DC-DC converter designs in regulated bus systems.
What control mode does the UC1843AJ use?
The UC1843AJ uses current-mode pulse width modulation (PWM) control, which provides cycle-by-cycle current limiting, simplified voltage loop compensation, and inherent protection against core saturation in transformer-based converter topologies.
What package does the UC1843AJ come in?
The UC1843AJ is housed in a ceramic dual-in-line (CDIP) 8-pin package (JESD-30 code R-GDIP-T8). The ceramic construction offers superior moisture resistance and mechanical durability compared to plastic DIP packages, making it suitable for military and high-reliability applications.
What types of power supply topologies can the UC1843AJ support?
The UC1843AJ is compatible with flyback, forward, and boost converter topologies. Its current-mode control and maximum duty cycle limiting make it especially effective in off-line isolated power supplies and DC-DC converters targeting 25 W to 200 W output power levels.
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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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