UC3842BN STMicroelectronics Integrated Circuit (Dual-In-Line Packages) In Stock
STMicroelectronics UC3842BN is a current-mode PWM controller supporting boost and flyback topologies at up to 500 kHz switching frequency and 1 A gate drive. Input voltage range is 11.5 V to 30 V in an 8-pin PDIP package. Available from stock with worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- UC3842BN Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2268(MOQ 1)
- 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 UC3842BN?
- Current-mode PWM control with cycle-by-cycle peak current limiting for inherent short-circuit protection in boost and flyback designs
- 500 kHz maximum switching frequency enabling compact transformer and filter design in isolated and non-isolated SMPS
- 1 A gate drive output with 11.5 V to 30 V input range, compatible with a wide range of power MOSFET gate capacitances
What is UC3842BN used for?
The UC3842BN is used in offline flyback power supplies and DC-DC boost converters for industrial, telecom, and consumer electronics applications requiring reliable current-mode control at switching frequencies up to 500 kHz. Its 1 A gate drive capability supports medium-power MOSFET switching stages in adapter, battery charger, and auxiliary power module designs operating from 11.5 V to 30 V input rails.
What are the specifications of UC3842BN?
| 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 | e3 |
| 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 |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Qualification Status | Not Qualified |
| Surface Mount | NO |
| Switcher Configuration | SINGLE |
| Switching Frequency-Max | 500kHz |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| ## UC3842BN 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 UC3842BN datasheet?
UC3842BN Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for UC3842BN?
Compatible alternatives and drop-in replacements for UC3842BN:
Rochester Electronics LLC 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8, GREEN, PLASTIC, DIP-8
suggested
suggested
suggested
suggested
suggested
Frequently Asked Questions
What switching frequency range does UC3842BN support, and how does it affect transformer size in a flyback design?
The UC3842BN operates at switching frequencies up to 500 kHz, which allows the use of significantly smaller flyback transformers and output filter capacitors compared to lower-frequency controllers. At 100 kHz a transformer might be 10x larger than at 500 kHz, directly reducing power supply size and weight in space-constrained industrial adapters.
How does current-mode control in UC3842BN improve transient response compared to voltage-mode PWM controllers?
UC3842BN's current-mode control senses the inductor or switch current on a cycle-by-cycle basis, providing inherent feedforward response to input voltage changes. This reduces the output filter requirement and achieves faster load transient response — typically settling within a few microseconds — compared to voltage-mode designs that rely solely on output voltage feedback.
What input voltage range does UC3842BN require, and is it suitable for a 24 V industrial supply rail?
The UC3842BN operates from 11.5 V minimum to 30 V maximum supply input, with 15 V as the nominal design point. A standard 24 V industrial rail falls comfortably within this range, making UC3842BN a direct fit for industrial SMPS controllers, DIN-rail power supplies, and motor drive auxiliary power circuits.
What gate drive current does UC3842BN deliver, and what MOSFET gate charge can it handle?
The UC3842BN provides 1 A peak gate drive current, capable of driving MOSFETs with gate charge up to approximately 100 nC at 500 kHz switching, which covers a wide range of medium-power switching transistors. For larger MOSFETs with higher gate charge, an external gate driver stage between UC3842BN and the FET is recommended.
Related Guides
150141RS73100 Red LED Indicator and Current-Resistor Design Guide
Design a reliable 150141RS73100 red LED indicator with worst-case resistor sizing, GPIO checks, PWM drive, layout, and production validation.
Jul 11, 2026
742792651 Ferrite Bead EMI Filter and Power Integrity Design Guide
Practical guidance for using 742792651 in ferrite-bead EMI filters, including bias, DCR, damping, layout, and validation.
Jul 11, 2026
How to Choose a Ferrite Bead for EMI Suppression Rails: Selection Guide
Compare 742792651 and related ferrite beads by impedance, current rating, DCR, package, layout, and EMI test context.
Jul 10, 2026
150141BS73100 Design Guide for 3528 Status Indicator LED Circuits
Design 3528 status indicator LED circuits with 150141BS73100: current setting, resistor sizing, polarity, optics, and sourcing checks.
Jul 10, 2026
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 |
|---|---|---|
| 1+ | $0.2335 | $0.23 |
| 10+ | $0.2285 | $2.29 |
| 25+ | $0.2269 | $5.67 |
| 27+ | $0.2268 | $6.12 |
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.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit