component
HT7555CNZ
Public Made by Adomby adom
HTCSEMI Timers / Counters, DIP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685
{
"schema_version": 1,
"type": "component",
"slug": "ht7555cnz",
"title": "HT7555CNZ",
"brief": "HTCSEMI Timers / Counters, DIP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
"component",
"clock-timing",
"ht7555cnz",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "HT7555CNZ",
"manufacturer": "HTCSEMI",
"package": "DIP-8",
"pin_count": 8,
"category": "Clock/Timing",
"subcategory": "Timers / Counters",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590460561751375872",
"parts": {
"symbol": "ht7555cnz.kicad_sym",
"footprint": "ht7555cnz.kicad_mod",
"model_3d": "ht7555cnz-hero.glb",
"model_3d_plain": "ht7555cnz-etched.glb",
"model_3d_step": "ht7555cnz-etched.step",
"model_3d_step_plain": "ht7555cnz.step",
"lbr": "ht7555cnz.lbr"
},
"distributor_links": {
"lcsc": "C5274684"
},
"distributor_check": {
"checked_at": "2026-10-15T11:48:17Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "no match"
},
"mouser": {
"pn": null,
"status": "no match"
}
},
"pins": [
{
"number": "1",
"name": "GND",
"type": "power_in",
"description": "Ground reference for the timer; input voltages must stay between GND -0.3V and V+ +0.3V, and the datasheet notes that exceeding these limits may cause destructive latch-up."
},
{
"number": "2",
"name": "TRIGGER",
"type": "input",
"description": "Negative-going trigger input that sets the internal flip-flop when it falls below 1/3 V+ (28 to 36% of VDD at 15V), with trigger current of 50 nA maximum at VDD = 15V."
},
{
"number": "3",
"name": "OUTPUT",
"type": "output",
"description": "Timer output from a CMOS inverter driver that can drive TTL or CMOS loads, with an absolute maximum output current of 100 mA."
},
{
"number": "4",
"name": "RESET",
"type": "input",
"description": "Active-low reset input that controls only the internal flip-flop and overrides all other inputs, with reset current of 50 nA maximum at VDD = 15V."
},
{
"number": "5",
"name": "CONTROL VOLTAGE",
"type": "passive",
"description": "Control voltage terminal that sets the threshold and trigger comparator trip points (about 67% of VDD at 15V) and does not require decoupling for stable operation."
},
{
"number": "6",
"name": "THRESHOLD",
"type": "input",
"description": "Threshold comparator input that resets the flip-flop when the voltage rises above 2/3 V+, with threshold current of 50 nA maximum at VDD = 15V."
},
{
"number": "7",
"name": "DISCHARGE",
"type": "output",
"description": "Discharge switch to GND that is on while the output is low, with discharge leakage of 50 nA maximum at VDD = 15V."
},
{
"number": "8",
"name": "VDD",
"type": "power_in",
"description": "Positive supply pin with a guaranteed functional supply range of 2.0 V to 18.0 V and an absolute maximum of +18 V."
}
],
"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 datasheet does not map the MPN suffix 'NZ' to a package. The 8-pin pinout is taken from the HT75; The datasheet lists the 8-pin device as MSOP, PDIP and SOIC. The DIP-8 pinout is the same across the; Pin types for DISCHARGE (output) and CONTROL VOLTAGE (passive) are engineering judgments. The datash"
],
"pages_sent": 10,
"cost_usd": 0.0527,
"at": "2026-10-15T11:48:04"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590460561751375872",
"pages": 10,
"sha256": "90e64792df0537cc",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 8,
"described": 8,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "ht7555cnz.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "body on z = 0, through-hole leads below",
"extents_mm": [
7.874,
9.27,
6.98
],
"zmin_mm": -3.3,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "4a377a56a8d9e9c0b86c095ef9ecc1869ac19e7f5069a3247b294250bf4f235d",
"checked": "2026-10-15",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "ht7555cnz-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "body on z = 0, through-hole leads below",
"extents_mm": [
7.874,
9.27,
6.98
],
"zmin_mm": -3.3,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "09ed6a12821a07c5ba0813feed8f3a52aecfdf5cedad0d699ab0448992d5e09f",
"checked": "2026-10-15",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "HTCSEMI",
"Package": "DIP-8",
"Category": "Clock/Timing",
"Pins": "8"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "90e64792df0537cc0c75697857538ac96b283a10d831fa06d43f04e26ce637ea",
"rows": [
{
"name": "Supply Voltage (absolute maximum)",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": null,
"typ": null,
"max": 18,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Output Current",
"symbol": "",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 100,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum Junction Temperature (Plastic Package)",
"symbol": "",
"kind": "absolute_maximum",
"unit": "°C",
"min": null,
"typ": null,
"max": 150,
"conditions": "Plastic package",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum Storage Temperature Range",
"symbol": "",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Supply Voltage Functional Operation",
"symbol": "VDD",
"kind": "recommended_operating",
"unit": "V",
"min": 2,
"typ": null,
"max": 18,
"conditions": "Functional operation, TA = +25°C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Static Supply Current (HT7555C)",
"symbol": "IDD",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 40,
"max": 200,
"conditions": "VDD = 5V, TA = +25°C",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Static Supply Current (HT7555C)",
"symbol": "IDD",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 60,
"max": 300,
"conditions": "VDD = 15V, TA = +25°C",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Monostable Timing Accuracy",
"symbol": "",
"kind": "tolerance",
"unit": "%",
"min": null,
"typ": null,
"max": 2,
"conditions": "RA = 10k, C = 0.1µF, VDD = 5V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Monostable Timing (printed time values)",
"symbol": "",
"kind": "electrical",
"unit": "µs",
"min": 858,
"typ": null,
"max": 1161,
"conditions": "RA = 10k, C = 0.1µF, VDD = 5V, TA = +25°C",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Astable Timing Accuracy",
"symbol": "",
"kind": "tolerance",
"unit": "%",
"min": null,
"typ": null,
"max": 2,
"conditions": "RA = RB = 10k, C = 0.1µF, VDD = 5V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Astable Timing (printed time values)",
"symbol": "",
"kind": "electrical",
"unit": "µs",
"min": 1717,
"typ": null,
"max": 2323,
"conditions": "RA = RB = 10k, C = 0.1µF, VDD = 5V, TA = +25°C",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Drift with Supply (monostable)",
"symbol": "",
"kind": "voltage_coefficient",
"unit": "%/V",
"min": null,
"typ": null,
"max": 0.5,
"conditions": "VDD = 5V to 15V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Drift with Supply (astable)",
"symbol": "",
"kind": "voltage_coefficient",
"unit": "%/V",
"min": null,
"typ": null,
"max": 0.5,
"conditions": "VDD = 5V to 15V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Threshold Voltage",
"symbol": "VTH",
"kind": "electrical",
"unit": "% VDD",
"min": 62,
"typ": 67,
"max": 71,
"conditions": "VDD = 15V, TA = +25°C",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Trigger Voltage",
"symbol": "VTRIG",
"kind": "electrical",
"unit": "% VDD",
"min": 28,
"typ": 32,
"max": 36,
"conditions": "VDD = 15V, TA = +25°C",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Control Voltage",
"symbol": "VCV",
"kind": "electrical",
"unit": "% VDD",
"min": 62,
"typ": 67,
"max": 71,
"conditions": "VDD = 15V, TA = +25°C",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Reset Voltage",
"symbol": "VRST",
"kind": "electrical",
"unit": "V",
"min": 0.4,
"typ": null,
"max": 1,
"conditions": "VDD = 2V to 15V, TA = +25°C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Trigger Current",
"symbol": "ITRIG",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 10,
"max": 50,
"conditions": "VDD = 15V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Threshold Current",
"symbol": "ITH",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 10,
"max": 50,
"conditions": "VDD = 15V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Reset Current",
"symbol": "IRST",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 10,
"max": 50,
"conditions": "VDD = 15V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Discharge Leakage Current",
"symbol": "IDIS",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 10,
"max": 50,
"conditions": "VDD = 15V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Output Voltage Low",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": 0.4,
"max": 1,
"conditions": "VDD = 15V, ISINK = 20mA, TA = +25°C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Output Voltage Low",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": 0.2,
"max": 0.4,
"conditions": "VDD = 5V, ISINK = 3.2mA, TA = +25°C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Output Voltage High",
"symbol": "VOH",
"kind": "electrical",
"unit": "V",
"min": 14.3,
"typ": 14.6,
"max": null,
"conditions": "VDD = 15V, ISOURCE = 0.8mA, TA = +25°C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Output Voltage High",
"symbol": "VOH",
"kind": "electrical",
"unit": "V",
"min": 4,
"typ": 4.3,
"max": null,
"conditions": "VDD = 5V, ISOURCE = 0.8mA, TA = +25°C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Discharge Output Voltage",
"symbol": "VDIS",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": 0.2,
"max": 0.4,
"conditions": "VDD = 5V, ISINK = 15mA, TA = +25°C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Discharge Output Voltage",
"symbol": "VDIS",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.4,
"conditions": "VDD = 15V, ISINK = 15mA",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Drift with Temperature (monostable)",
"symbol": "",
"kind": "temperature_coefficient",
"unit": "ppm/°C",
"min": null,
"typ": 150,
"max": null,
"conditions": "VDD = 5V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Drift with Temperature (monostable)",
"symbol": "",
"kind": "temperature_coefficient",
"unit": "ppm/°C",
"min": null,
"typ": 200,
"max": null,
"conditions": "VDD = 10V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Drift with Temperature (monostable)",
"symbol": "",
"kind": "temperature_coefficient",
"unit": "ppm/°C",
"min": null,
"typ": 250,
"max": null,
"conditions": "VDD = 15V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Drift with Temperature (astable)",
"symbol": "",
"kind": "temperature_coefficient",
"unit": "ppm/°C",
"min": null,
"typ": 150,
"max": null,
"conditions": "VDD = 5V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Drift with Temperature (astable)",
"symbol": "",
"kind": "temperature_coefficient",
"unit": "ppm/°C",
"min": null,
"typ": 200,
"max": null,
"conditions": "VDD = 10V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Drift with Temperature (astable)",
"symbol": "",
"kind": "temperature_coefficient",
"unit": "ppm/°C",
"min": null,
"typ": 250,
"max": null,
"conditions": "VDD = 15V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Output Rise Time",
"symbol": "tR",
"kind": "timing",
"unit": "ns",
"min": null,
"typ": 75,
"max": null,
"conditions": "RL = 10MΩ, CL = 10pF, VDD = 5V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Output Fall Time",
"symbol": "tF",
"kind": "timing",
"unit": "ns",
"min": null,
"typ": 75,
"max": null,
"conditions": "RL = 10MΩ, CL = 10pF, VDD = 5V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Oscillator Frequency",
"symbol": "fMAX",
"kind": "electrical",
"unit": "MHz",
"min": null,
"typ": 1,
"max": null,
"conditions": "VDD = 5V, RA = 470Ω, RB = 270Ω, C = 200pF",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Thermal Resistance Junction-to-Ambient (8 Ld PDIP)",
"symbol": "θJA",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 130,
"max": null,
"conditions": "Typical; measured in free air on low thermal conductivity test board",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Thermal Resistance Junction-to-Case (8 Ld PDIP)",
"symbol": "θJC",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 69,
"max": null,
"conditions": "Typical; case temp at package top center",
"source_page": 2,
"source": "datasheet"
}
]
}
},
"variants": [],
"sections": [
"hero",
"viewers",
"readme",
"breadcrumbs",
"info"
],
"discovery_triggers": [
"ht7555cnz"
],
"discovery_pitch": "HT7555CNZ (HTCSEMI) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
"author": {
"name": "Ray",
"email": "[email protected]"
},
"dependencies": {},
"hero": {
"type": "image",
"path": "docs/hero.png"
},
"files": [
"page.json",
"README.md",
"ht7555cnz.kicad_sym",
"ht7555cnz.kicad_mod",
"ht7555cnz.glb",
"ht7555cnz.step",
"ht7555cnz.lbr",
"docs/hero.png",
"docs/ht7555cnz-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"ht7555cnz-hero.glb",
"ht7555cnz-hero.overlay.json",
"ht7555cnz-etched.glb"
],
"visibility": {
"public": true
}
}