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Description
STMICROELECTRONICS UC3842BN Current Mode PWM Controller, 12V-25V supply, 250kHz, 13.5V/200mA out, DIP-8The UC3842BN is a high performance current mode PWM Controller IC provides the necessary features to implement off line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start up current less than 0. 5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure
The UC3842BN is a high performance current mode PWM Controller IC provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control and a totem pole output stage designed to source or sink high peak current.
- Trimmed oscillator for precise frequency control
- Oscillator frequency guaranteed at 250kHz
- Current mode operation to 500kHz
- Automatic feed forward compensation
- Latching PWM for cycle-by-cycle current limiting
- Internally trimmed reference with under-voltage lockout
- High current totem pole output
- Under voltage lockout with hysteresis
- Low start-up and operating current
Applications
Power Management
Product details
| Controller IC Case Style | DIP |
| Operating Temperature Min | -25°C |
| Output Current | 200mA |
| Operating Temperature Max | 85°C |
| No. of Pins | 8Pins |
| Frequency | 250kHz |
| Output Voltage | 5.1V |
| Input Voltage | 15V |
| Product Range | - |
| Automotive Qualification Standard | - |
| Supply Voltage Min | 12V |
| Packaging | Each |
| Supply Voltage Max | 25V |
| MSL | - |
Other details
| Brand | STMICROELECTRONICS |
| Part Number | UC3842BN |
| Quantity | Each |
| Technical Data Sheet EN | |
| Product Change Notice EN |
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4.8 ★★★★★
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Product Reviews
★★★★★ 2
Paper towel continues to spin!
Color: Warm Gold
The paper towel continues to spin because it does not have a buffer inside. So select a size paper towel does not work with this particular paper towel holder.
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Classy
Color: Warm Gold
I really love this! It looks so classy and it is good and heavy - feels expensive.
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Reviewed in the United States on April 26, 2026
★★★★★ 5
Simple, Solid, and Looks Great
Color: Antique Bronze
This is one of those simple things that just works exactly how you want it to.
First off, it looks really nice on the counter. The antique bronze finish has a slightly warm tone that doesn’t look cheap or overly shiny, and the design is clean enough to fit in with pretty much any kitchen style.
Assembly took maybe 30 seconds. You just screw the pieces together and it’s ready to go, no tools or fuss. Swapping out rolls is just as easy, and the top cap keeps everything in place without being annoying to deal with.
The weight is really what makes this stand out. The base is heavy enough that it stays put when you tear off a sheet, so you can actually use it one-handed without it tipping or sliding around. It feels solid and well made, not flimsy at all.
Size-wise, it fits a standard roll easily and still has room for larger rolls, so you’re not fighting to get a new one on.
Overall, it’s sturdy, looks good, and is genuinely easy to use day to day. It’s one of those upgrades that seems small but makes your kitchen feel a little more put together.
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Reviewed in the United States on May 5, 2026
★★★★★ 5
One of the best biblical motivational books I’ve read
Format: Kindle
I’ve always enjoyed Dr David Jeremiah’s expository preaching. He has been a faithful steward of God’s word. When I came across this book, I was amazed that he wrote a book to give people a positive attitude in moving forward with the vision and dream the Lord has given us. It’s been an enlightening and delightful read.
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Reviewed in the United States on December 31, 2025
★★★★★ 5
Looking Forward vs Living in the Past!
Format: Paperback
Fresh, encouraging information about making the most of your life and looking forward to each stage of life as well as each day. David Jeremiah presents a balanced, thoughtful approach to facing change, retirement and “getting the most important things done”! Great gift for adult readers of many ages!
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Reviewed in the United States on May 14, 2025