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UC3842 UC3842B UC3842BN UC3842AN
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In Stock
Shipping Fee of ₹ 100
Shipping Fee of ₹ 100
Description
UC3842 UC3842B UC3842BN UC3842AN
The UC3842 is a highly popular fixed-frequency, current-mode PWM controller IC widely used for controlling off-line and DC-to-DC switch-mode power supplies (SMPS). The suffixes appended to the base part number indicate specific technical revisions, startup threshold enhancements, and package styles.
Base function definitions
Every variant in this part family shares the core functionality of a single-ended current-mode controller. They all feature a totem-pole output stage designed to directly source and sink high peak currents into the gate of an external power MOSFET.
They operate at up to 500 kHz and utilize undervoltage lockout (UVLO) to turn on at 16V and turn off at 10V, offering a maximum duty cycle clamped near 100%.
Decoding the suffixes
The secondary characters differentiate performance and hardware footprints:
- A revision: The “A” modification (e.g., UC3842A) denotes a low startup-current revision. While the standard part takes up to 1.0 mA, the A-version requires a startup current under 0.3 mA, allowing designers to use higher value startup resistors to minimize standby power losses.
- B revision: The “B” version (e.g., UC3842B) signifies an enhanced revision from manufacturers like STMicroelectronics or onsemi. It features improved duty cycle parameter control, tighter oscillator frequency tolerances, and an enhanced UVLO threshold margin.
- N modifier: This character explicitly dictates the physical package style. The letter “N” refers to a plastic dual in-line through-hole package (PDIP-8). If the “N” is omitted, the part is often an SMD package like an SOIC-8 or SOP-8.
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Side-by-side comparison
Part Number Package Type Max Startup Current Revision Status UC3842 Family Base Generic 1.0 mA Standard UC3842B Surface Mount (SOP/SOIC) 0.5 mA Enhanced Precision UC3842BN Through-Hole (PDIP-8) 0.5 mA Enhanced Precision UC3842AN Through-Hole (PDIP-8) 0.3 mA Ultra-Low Startup Current
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UC3842 UC3842B UC3842BN UC3842AN
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