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UC3842N-TUDI

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Tudi AC-DC Controllers And Regulators, DIP-8. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.

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UC3842N-TUDI

Tudi · AC-DC Controllers And Regulators · DIP-8

UC3842N-TUDI from Tudi, in a DIP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 COMP output Error amplifier output for loop compensation; error amp sink current limited to 10 mA.
2 VFB input Error amplifier inverting input (feedback voltage); analog input range -0.3 to 5.5 V.
3 ISENSE input Current sense comparator input; analog input range -0.3 to 5.5 V with maximum input signal about 1.0 V.
4 RT/CT passive Oscillator timing pin connecting external RT and CT to set frequency, up to 500 kHz.
5 GND power_in Ground and power ground return for the IC and totem pole output.
6 OUT output High current totem pole output for driving a power MOSFET, rated for ±1 A output current.
7 VCC power_in Supply voltage input with undervoltage lockout, 30 V maximum, internally clamped by a 36 V zener.
8 VREF power_out 5.0 V reference output (4.9 to 5.1 V) supplying up to 20 mA.

Key specifications

Parameter Value
Manufacturer Tudi
Package DIP-8
Category Power Management (PMIC)
Pins 8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Reference Output Voltage VREF 4.9 5 5.1 V TJ = 25°C, IREF = 1 mA 3
Line Regulation ∆VREF 6 20 mV 12V ≤ VCC ≤ 25 V 3
Load Regulation ∆VREF 6 25 1 mA ≤ IREF ≤ 20mA 3
Short Circuit Output Current ISC -100 -180 mA TA = 25°C 3
Oscillation Frequency f 47 52 57 KHz TJ = 25°C 3
Frequency Change with Voltage ∆f/∆VCC 0.05 1 % 12V ≤ VCC ≤ 25 V 3
Error Amp Input Bias Current IBIAS -0.1 -2 µA VFB=3V 3
Error Amp Input Voltage VI(E.A) 2.42 2.5 2.58 V Vpin1 = 2.5V 3
Open Loop Voltage Gain AVOL 65 90 dB 2V ≤ V0 ≤ 4V 3
Unity Gain Bandwidth UGBW 0.5 0.6 MHz Tj=25°C, Note 3 3
Power Supply Rejection Ratio PSRR 60 70 dB 12V ≤ VCC ≤ 25 V 3
Error Amp Output Sink Current ISINK 2 7 mA Vpin2 = 2.7V, Vpin1 = 1.1V 3
Error Amp Output Source Current ISOURCE -0.5 -1 mA Vpin2 = 2.3V, Vpin1 = 5V 3
Error Amp High Output Voltage VOH 5 6 V Vpin2 = 2.3V, RL = 15KΩ to GND 3
Error Amp Low Output Voltage VOL 0.8 1.1 V Vpin2 = 2.7V, RL = 15KΩ to PIN 8 3
Current Sense Gain GV 2.85 3 3.15 V/V Note 1 & 2 3
Maximum Input Signal VI(MAX) 0.9 1 1.1 V Vpin1 = 5V (Note 1) 3
Current Sense Input Bias Current IBIAS -3 -10 µA Vpin3 = 3V 3
Output Low Voltage at ISINK = 20 mA VOL 0.08 0.4 V ISINK = 20 mA 3
Output Low Voltage at ISINK = 200 mA VOL 1.4 2.2 V ISINK = 200 mA 3
Output High Voltage at ISINK = 20 mA VOH 13 13.5 V ISINK = 20 mA 3
Output High Voltage at ISINK = 200 mA VOH 12 13 V ISINK = 200 mA 3
Rise Time tR 45 150 nS TJ = 25°C, CL = 1nF (Note 3) 3
Fall Time tF 35 150 nS TJ = 25°C, CL = 1nF (Note 3) 3
Start Threshold (UC3842/44 on-threshold) VTH(ST) 14.5 16 17.5 V UC2842/44, UC3842/44 3
Minimum Operating Voltage after turn-on (UC3842/44) VOPR(min) 8.5 10 11.5 V UC2842/44, UC3842/44; after turn on 3
Maximum Duty Cycle (UC3842/43) D(MAX) 95 97 100 % UC2842/43, UC3842/43 3
Minimum Duty Cycle D(MAX) 0 % 3
Start-Up Current IST 0.17 0.3 mA UC3842/43/44/45 3
Operating Supply Current ICC (OPR) 13 17 mA Vpin3 = Vpin2 = 0V 3
Zener Voltage VZ 30 38 V ICC=25 mA 3
Supply Voltage (low impedance source), absolute maximum VCC 30 V 3
Output Current, absolute maximum IO -1 1 A 3
Analog Input Voltage (pins 2,3), absolute maximum VI -0.3 5.5 V 3
Error Amp Output Sink Current, absolute maximum ISINK (E.A) 10 mA 3
Power Dissipation, absolute maximum PO 1 W TA = 25°C 3
Storage Temperature Range Tstg -65 150 °C 3
Lead Temperature, absolute maximum TL 260 °C soldering 5 sec. 3
Ambient Operating Temperature (UC3842 characterized range) TA 0 70 °C UC3842/43/44/45 characterized range 1

CAD (KiCad official)

  • Symbol: UC3842N-TUDI
  • Footprint: Package_DIP:DIP-8_W7.62mm
  • 3D model: DIP-8 (KiCad packages3D, STEP)
  • 3D model files: uc3842n-tudi-etched.step / uc3842n-tudi-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc3842n-tudi.step / uc3842n-tudi.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Tudi datasheet (11 pp, sha256 fa001136cdaccd5a, retrieved 2026-10-21, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF