component
IS32LT3958-ZLA3-TR
Public Made by Adomby adom
ISSI Integrated Silicon Solution LED Drivers, eTSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"slug": "is32lt3958-zla3-tr",
"version": "0.1.0",
"type": "component",
"description": "ISSI Integrated Silicon Solution LED Drivers, eTSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"tags": [
"component",
"led drivers",
"is32lt3958-zla3-tr",
"factory-2.0.0",
"extractor-text"
],
"dependencies": {},
"hero": {
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"path": "docs/hero.png"
},
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"README.md",
"is32lt3958-zla3-tr.kicad_sym",
"is32lt3958-zla3-tr.kicad_mod",
"is32lt3958-zla3-tr.glb",
"is32lt3958-zla3-tr.step",
"is32lt3958-zla3-tr.lbr",
"docs/hero.png",
"docs/is32lt3958-zla3-tr-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"is32lt3958-zla3-tr-hero.glb",
"is32lt3958-zla3-tr-hero.overlay.json"
],
"component": {
"mpn": "IS32LT3958-ZLA3-TR",
"manufacturer": "ISSI Integrated Silicon Solution",
"package": "eTSSOP-20",
"pin_count": 21,
"category": "LED Drivers",
"subcategory": "LED Drivers",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603606417735897088",
"parts": {
"symbol": "is32lt3958-zla3-tr.kicad_sym",
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"model_3d_step": "is32lt3958-zla3-tr-etched.step",
"model_3d_step_plain": "is32lt3958-zla3-tr.step",
"lbr": "is32lt3958-zla3-tr.lbr"
},
"distributor_links": {
"lcsc": "C20342582",
"mouser": "870-IS32LT3958ZLA3TR"
},
"distributor_check": {
"checked_at": "2026-10-09T23:24:24Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "deferred",
"error": "shared DigiKey quota guard: 539 calls left today"
},
"mouser": {
"pn": "870-IS32LT3958ZLA3TR",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "VCC",
"type": "power_in",
"description": "The power supply pin."
},
{
"number": "2",
"name": "PWM/EN",
"type": "input",
"description": "External PWM dimming and enable pin: pull high to enable and low to disable the IC, do not let it float, and connect it to VCC via a resistor (recommended 10kΩ) if not used."
},
{
"number": "3",
"name": "FAULTB",
"type": "output",
"description": "Open-drain active-low fault reporting pin, with a recommended 47kΩ pull-up resistor to the required logic level voltage."
},
{
"number": "4",
"name": "FRQSS",
"type": "passive",
"description": "Spread-spectrum frequency setting pin: a capacitor to ground sets the dither frequency, and connecting it directly to ground disables the function."
},
{
"number": "5",
"name": "COMP",
"type": "passive",
"description": "Loop compensation pin."
},
{
"number": "6",
"name": "RT/SYNC",
"type": "input",
"description": "An external resistor to ground sets the operating frequency, and an external clock applied to this pin can synchronize two or more ICs."
},
{
"number": "7",
"name": "ICTRL",
"type": "input",
"description": "Analog dimming pin with a range of 0.06V to 2V (zero current below 0.06V, full current between 2V and 5V), which must not float and should be decoupled with a 10nF X7R capacitor placed close to the pin."
},
{
"number": "8",
"name": "ADJR",
"type": "input",
"description": "Analog dimming pin with identical function to ICTRL."
},
{
"number": "9",
"name": "SS",
"type": "passive",
"description": "Soft-start time programming pin: a capacitor from this pin to GND sets the soft-start time, and the pin must not float."
},
{
"number": "10",
"name": "PWMDC",
"type": "input",
"description": "Internal PWM generator duty-cycle setting pin: 0V to 3V enables the internal PWM generator and sets the duty cycle, 3V to 5V disables it, and the pin must never float or be connected directly to VDD."
},
{
"number": "11",
"name": "PWMFR",
"type": "passive",
"description": "Internal PWM generator frequency pin: a resistor from this pin to GND sets the internal PWM frequency (100Hz to 1kHz)."
},
{
"number": "12",
"name": "IMON",
"type": "output",
"description": "Output current reporting pin with VIMON = 8 × (VISP − VISN), internally clamped to VIMON_CLP (typical 3.35V), and left floating if unused."
},
{
"number": "13",
"name": "OV",
"type": "input",
"description": "Output voltage detection pin: a resistor divider from the output to GND sets the output overvoltage and undervoltage protection thresholds."
},
{
"number": "14",
"name": "ISN",
"type": "input",
"description": "LED current sense amplifier negative input."
},
{
"number": "15",
"name": "ISP",
"type": "input",
"description": "LED current sense amplifier positive input."
},
{
"number": "16",
"name": "GND",
"type": "power_in",
"description": "Ground pin; the exposed thermal pad must be soldered to a large GND copper plane."
},
{
"number": "17",
"name": "CS",
"type": "input",
"description": "External NMOS switch current sense for control loop and overcurrent protection, connected through a resistor to ground."
},
{
"number": "18",
"name": "DIMOUT",
"type": "output",
"description": "Buffered PWM signal driving the LED string disconnect NMOS, with its high level set by the internal VDD LDO, also used for fault protection, and left floating if not used."
},
{
"number": "19",
"name": "GATE",
"type": "output",
"description": "Gate drive to the external power NMOS, switching between VDD and GND."
},
{
"number": "20",
"name": "VDD",
"type": "power_out",
"description": "Internal LDO output that needs a low-ESR 1µF capacitor placed close to the pin, and is not meant to power any external circuit."
},
{
"number": "21",
"name": "EP",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-haiku-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: The exposed thermal pad is not given a pin number in the datasheet pin table or the package drawing ; The pin-configuration top-view text on page 5 is scrambled, so the number-to-name mapping was taken ; Pin types are inferred from the functional descriptions because the datasheet does not classify pins",
"exposed pad 21 added from the footprint"
],
"pages_sent": 9,
"cost_usd": 0.0745,
"at": "2026-10-09T23:21:50"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603606417735897088",
"pages": 35,
"sha256": "66f84e58b57e6565",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 21,
"described": 21,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
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"footprint": "viewers/footprint.html"
},
"models_3d": [
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"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
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],
"zmin_mm": -0.0,
"centre_offset_mm": 0.0,
"footprint_binding": "identity",
"sha256": "7a0251e13b07dd6c1b086d69741c02849106cddb90d1e188d1f17dfcba69e646",
"checked": "2026-10-09",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "is32lt3958-zla3-tr-etched.step",
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}
}