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IS31FL3733-QFLS4-TR

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ISSI Integrated Silicon Solution LED Drivers, QFN-48-EP(6x6). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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IS31FL3733-QFLS4-TR

ISSI Integrated Silicon Solution · LED Drivers · QFN-48-EP(6x6)

IS31FL3733-QFLS4-TR from ISSI Integrated Silicon Solution, in a QFN-48-EP(6x6). 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 NC unconnected Not connected internally.
2 SW1 output Switch pin for LED matrix scanning (column SW1).
3 SW2 output Switch pin for LED matrix scanning (column SW2).
4 SW3 output Switch pin for LED matrix scanning (column SW3).
5 PGND power_in Power ground.
6 SW4 output Switch pin for LED matrix scanning (column SW4).
7 SW5 output Switch pin for LED matrix scanning (column SW5).
8 SW6 output Switch pin for LED matrix scanning (column SW6).
9 SW7 output Switch pin for LED matrix scanning (column SW7).
10 SW8 output Switch pin for LED matrix scanning (column SW8).
11 SW9 output Switch pin for LED matrix scanning (column SW9).
12 PGND power_in Power ground.
13 SW10 output Switch pin for LED matrix scanning (column SW10).
14 SW11 output Switch pin for LED matrix scanning (column SW11).
15 SW12 output Switch pin for LED matrix scanning (column SW12).
16 CS1 output Current source output for row control (CS1).
17 CS2 output Current source output for row control (CS2).
18 CS3 output Current source output for row control (CS3).
19 CS4 output Current source output for row control (CS4).
20 PVCC power_in Power supply for the current sources.
21 CS5 output Current source output for row control (CS5).
22 CS6 output Current source output for row control (CS6).
23 CS7 output Current source output for row control (CS7).
24 CS8 output Current source output for row control (CS8).
25 CS9 output Current source output for row control (CS9).
26 CS10 output Current source output for row control (CS10).
27 CS11 output Current source output for row control (CS11).
28 CS12 output Current source output for row control (CS12).
29 PVCC power_in Power supply for the current sources.
30 CS13 output Current source output for row control (CS13).
31 CS14 output Current source output for row control (CS14).
32 CS15 output Current source output for row control (CS15).
33 CS16 output Current source output for row control (CS16).
34 AGND power_in Analog ground.
35 R_EXT passive Input terminal for an external resistor that sets the current source DC current value.
36 NC unconnected Not connected internally.
37 AVCC power_in Power supply for analog circuits.
38 DVCC power_in Power supply for digital circuits.
39 VIO power_in Input logic reference voltage.
40 SYNC bidirectional Synchronization pin for multi-part operation; leave floating if not used.
41 SDA bidirectional I2C-compatible serial data.
42 SCL input I2C-compatible serial clock.
43 ADDR1 input I2C address setting.
44 ADDR2 input I2C address setting.
45 INTB output Interrupt output, active low when an interrupt event occurs; may be left floating if the interrupt function is not used.
46 SDB input Shuts down the chip when pulled low.
47 IICRST input Resets the I2C interface when pulled high; must be pulled low during normal operation.
48 GND power_in Ground; connect to GND.
49 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer ISSI Integrated Silicon Solution
Package QFN-48-EP(6x6)
Category LED Drivers
Pins 49

CAD (KiCad official)

  • Symbol: IS31FL3733-QFLS4-TR
  • Footprint: Package_DFN_QFN:QFN-48-1EP_6x6mm_P0.4mm_EP4.4x4.4mm
  • 3D model: QFN-48-EP(6x6), generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.9 mm nominal QFN height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
  • 3D model files: is31fl3733-qfls4-tr-etched.step / is31fl3733-qfls4-tr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); is31fl3733-qfls4-tr.step / is31fl3733-qfls4-tr.glb are the bare package body.

Provenance

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

  • Datasheet: ISSI Integrated Silicon Solution datasheet (31 pp, sha256 536d20da9f0b86c9, retrieved 2026-10-09, 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