component

MST1661TQ

Public Made by Adom

by adom

MST LED Drivers, TO-252. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

markdown

MST1661TQ

MST · LED Drivers · TO-252

MST1661TQ from MST, in a TO-252. 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 VIN power_in Battery positive terminal that supplies the device, with a DC supply range of 9 V to 24 V and a DC supply voltage absolute maximum of 40 V.
2 VOUT output Output terminal that switches the bulbs through the internal driver, with on-state resistance RDS(ON) of 60 mΩ typical and 80 mΩ maximum (Vdd=5V, Ic=1.6A), and drain current internally limited.
3 CEXT passive Capacitor terminal for the external capacitor connected between CEXT and OUT that stores energy to power the device during the ON phase, with a CEXT capacitor voltage absolute maximum of 20 V.

Key specifications

Parameter Value
Manufacturer MST
Package TO-252
Category LED Drivers
Pins 3

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
DC Supply Voltage Vin 9 24 V 3
Under voltage Lockout Threshold VddNORM 6.3 6.5 6.7 V VCEXT rising 3
Under voltage Lockout Hysteresis VddUVLO 1.4 1.5 1.7 V VCEXT falling 3
On State Resistance RDS(ON) 60 80 mΩ Vdd=5V;Ic =1.6A 3
Oscillating Frequency Focs 1.33 1.42 1.5 Hz 3
Drain Current Limit Ilim 15 A Rload<100mΩ 3
Overtemperature Shutdown Tjsh 125 140 ℃ 3
Overtemperature Reset Tjrs 100 115 ℃ 3
Turn-on Current Slope dI/dt(on) 0.02 A/us Rload=8Ω 3
Turn-off Current Slope dI/dt(off) 0.02 A/us Rload=8Ω 3
MST1661 Double Frequency Flashing Threshold IDF1 1.55 1.71 1.87 A Vin=9V 3
MST1661 Double Frequency Flashing Threshold IDF2 1.79 1.98 2.18 A Vin=12V 3
MST1661 Double Frequency Flashing Threshold IDF3 1.97 2.2 2.42 A Vin=15V 3
DC Supply Voltage (absolute maximum) Vin 40 V 2
CEXT Capacitor Voltage Vdd 20 V 2
Electrostatic Discharge (Human Body Mode) Vesd 2000 V Human Body Mode 2
Electrostatic Discharge (Machine Mode) Vesd 200 V Machine Mode 2
Power Dissipation PL 55 W Tc=25°C 2
Storage Temperature Tstg -40 150 ℃ 2
Thermal Resistance Junction-top Rthj-t 3.33 ℃/W 2
Thermal Resistance Junction-ambient Rthj-amb 45 ℃/W 2

CAD (KiCad official)

  • Symbol: MST1661TQ
  • Footprint: Package_TO_SOT_SMD:TO-252-2
  • 3D model: TO-252 (KiCad packages3D, STEP)
  • 3D model files: mst1661tq-etched.step / mst1661tq-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mst1661tq.step / mst1661tq.glb are the bare package body.

Provenance

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

  • Datasheet: MST datasheet (6 pp, sha256 a4f89d63ee5a5c12, retrieved 2026-10-18, tier: lcsc)
  • 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