UC3844BN STMicroelectronics Integrated Circuit (Dual-In-Line Packages) In Stock
The UC3844BN is a current-mode PWM switching controller IC designed for fixed-frequency flyback and forward converter designs, operating with input voltages from 11.5 V to 30 V. It is housed in an 8-pin DIP package and available from global distributors with fast worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- UC3844BN Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2472(MOQ 400)
- 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 UC3844BN?
- Current-mode PWM control with cycle-by-cycle current limiting for robust overcurrent protection
- Wide input voltage range of 11.5 V to 30 V supporting diverse power supply designs
- Fixed-frequency operation with adjustable oscillator for optimized switching performance in flyback and forward converters
What is UC3844BN used for?
The UC3844BN is ideal for off-line and DC-DC switching power supply designs using flyback or forward converter topologies at frequencies up to 500 kHz. Its current-mode control simplifies loop compensation and improves transient response in compact power modules used in industrial equipment, telecom power supplies, and consumer electronics adapters. The 8-pin DIP package makes it easy to prototype and validate designs on standard breadboards.
What are the specifications of UC3844BN?
| Factory Lead Time | 14Weeks |
| YTEOL | 6 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 30V |
| Input Voltage-Min | 11.5V |
| Input Voltage-Nom | 15V |
| JESD-30 Code | R-PDIP-T8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Surface Mount | NO |
| Switcher Configuration | SINGLE |
| Switching Frequency-Max | 500kHz |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| ## UC3844BN Alternates Showing results | Image |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mainland China |
Where can I find the UC3844BN datasheet?
UC3844BN Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for UC3844BN?
Compatible alternatives and drop-in replacements for UC3844BN:
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDIP8
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Frequently Asked Questions
What is the operating input voltage range of the UC3844BN and how does it affect power supply design?
The UC3844BN operates with input voltages from 11.5 V minimum to 30 V maximum, with a nominal supply of 15 V. This range makes it well-suited for auxiliary power rails in industrial and telecom power supplies, where the controller is powered from an intermediate regulated bus rather than directly from the AC line.
How does current-mode control in the UC3844BN improve switching power supply performance?
Current-mode PWM control in the UC3844BN provides inherent cycle-by-cycle overcurrent limiting and simplifies feedback loop compensation compared to voltage-mode controllers. This results in faster transient response and improved line regulation in flyback and forward converters operating at up to 500 kHz.
Which power conversion topologies are compatible with the UC3844BN?
The UC3844BN is optimized for single-ended topologies including flyback and forward converters, supporting output power levels from a few watts up to tens of watts. Its fixed-frequency oscillator can be programmed with external RC components, giving designers flexibility to set switching frequency and optimize efficiency for their specific application.
When would UC3844BN be chosen over a voltage-mode PWM controller in a compact supply design?
UC3844BN is preferred over voltage-mode controllers when fast line-transient rejection and simpler loop compensation are priorities. Current-mode control inherently senses the peak inductor current each cycle, eliminating one pole from the control loop and making it easier to stabilize designs with 8-pin DIP footprints in tight board layouts.
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Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 400+ | $0.4700 | $188.00 |
| 1000+ | $0.2474 | $247.40 |
| 4000+ | $0.2473 | $989.20 |
| 8000+ | $0.2472 | $1977.60 |
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