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LKQ4919ST

Public Made by Adom

by adom

LKWIC Supervisor And Reset ICs, SOT-23-6. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LKQ4919ST

LKWIC · Supervisor And Reset ICs · SOT-23-6

LKQ4919ST from LKWIC, in a SOT-23-6. 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 RESET# output Open-drain reset output that is driven low when SENSE falls below VIT or MR# is at logic low, and needs a 10kΩ to 1MΩ pull-up to VDD (it may be pulled above VDD).
2 GND power_in Ground reference pin.
3 MR# input Manual reset input; driving it low asserts RESET#, and it has an internal 100kΩ pull-up to VDD.
4 CT passive Reset timeout delay pin: connecting it to VDD through a 40kΩ to 200kΩ resistor or leaving it open gives a fixed delay, while a grounded capacitor of at least 100pF sets a user-programmable delay.
5 SENSE input Voltage monitor input; RESET# is asserted when the voltage on this pin falls below the threshold VIT.
6 VDD power_in Power supply pin.

Key specifications

Parameter Value
Manufacturer LKWIC
Package SOT-23-6
Category Power Management (PMIC)
Pins 6

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Power supply voltage (absolute maximum) VDD -0.3 7 V 5
CT pin voltage (absolute maximum) VCT -0.3 V 5
RESET# pin voltage (absolute maximum) VRESET# -0.3 7 V 5
MR# pin voltage (absolute maximum) VMR# -0.3 7 V 5
SENSE pin voltage (absolute maximum) VSENSE -0.3 7 V 5
RESET# pin current (absolute maximum) IRESET# -5 5 mA 5
Storage temperature TSTG -65 150 ℃ 5
Junction temperature Tj 150 ℃ 5
Power supply voltage (recommended) VDD 1.7 6.5 V 5
SENSE pin voltage (recommended) VSENSE 0 6.5 V 5
MR# pin voltage (recommended) VMR# 0 6.5 V 5
RESET# pin voltage (recommended) VRESET# 0 6.5 V 5
RESET# pin current (recommended) IRESET# 0.0003 5 mA 5
Operating temperature TA -40 85 ºC 5
Supply voltage VDD 1.7 6.5 V 6
Supply voltage VDD 1.65 6.5 V TA=0℃～+85℃ 6
Supply current (RESET# disabled, MR#, RESET#, CT open) IDD 0.8 1.6 µA VDD=3.3V 6
Supply current (RESET# disabled, MR#, RESET#, CT open) IDD 1 2 µA VDD=6.5V 6
Output low voltage VOL 0.2 V 1.3V≤VDD<1.8V, IOL=0.4mA 6
Output low voltage VOL 0.3 V 1.8V≤VDD<6.5V, IOL=1.0mA 6
Power-on reset voltage VPOR 0.8 V VOL(Max)=0.2V, IRESET#=15µA 6
Reverse input threshold voltage accuracy -2 2 % 6
Reverse input threshold voltage accuracy -1.5 1.5 % VIT≤3.3V, TA=-40℃～+85℃ 6
VIT hysteresis voltage VHYST 1.5 3 % VIT 6
MR# internal pull-up resistance RMR# 50 100 kΩ 6
SENSE input current ISENSE -1 1 µA VSENSE=VIT 6
RESET# delay time td 12 20 28 ms CT=Open 6
RESET# delay time td 180 300 420 ms CT=VDD 6
RESET# delay time td 0.75 1.25 1.75 ms CT=100pF 6
RESET# delay time td 700 1200 1700 ms CT=180nF 6
MR# input low voltage VIL 0 V 6
VIT reverse input threshold voltage VIT 0.405 V 6
RESET# leakage current IOH 300 nA VRESET#=6.5V, RESET# not enabled 6
Input capacitance (CT pin) CIN 5 pF VIN=0V~VDD 6
Input capacitance (other pins) CIN 5 pF VIN=0V~6.5V 6
Reset input pulse width (SENSE) tw 100 μs VIH=1.05VIT, VIL=0.95VIT 6
Reset input pulse width (MR#) tw 150 ns VIH=0.7VDD, VIL=0.3VDD 6
Propagation delay MR# to RESET# (high to low) tPHL 250 ns VIH=0.7VDD, VIL=0.3VDD 6
Propagation delay SENSE to RESET# (high to low) tPHL 100 μs VIH=1.05VIT, VIL=0.95VIT 6
Junction-to-ambient thermal resistance (6 pin) RθJA 180.9 °C/W 5
Junction-to-case (top) thermal resistance RθJC(top) 117.8 °C/W 5
Junction-to-board thermal resistance RθJB 27.8 °C/W 5
Junction-to-top characterization parameter ψJT 18.9 °C/W 5
Junction-to-board characterization parameter ψJB 30 °C/W 5

CAD (KiCad official)

  • Symbol: LKQ4919ST
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-23-6 (KiCad packages3D, STEP)
  • 3D model files: lkq4919st-etched.step / lkq4919st-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lkq4919st.step / lkq4919st.glb are the bare package body.

Provenance

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

  • Datasheet: LKWIC datasheet (11 pp, sha256 f6629aec41038312, retrieved 2026-10-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF