component

LM555IMM

Public Made by Adom

by adom

HGSEMI Timers, MSOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM555IMM

HGSEMI · Timers · MSOP-8

LM555IMM from HGSEMI, in a MSOP-8. 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 GND power_in Ground (power ground) pin.
2 Trig input Trigger input; output goes high when trigger voltage falls below 1/3 Vcc, with trigger voltage typically 5.0 V at Vcc=15 V and 1.6 V at Vcc=5 V.
3 Output output Timer output, able to source/sink up to ±200 mA recommended (±220 mA absolute maximum).
4 Reset input Active-low reset input that forces output low and turns the discharge switch on; high level is 1.5 V min to Vcc, low level is GND to 0.5 V at Vcc=5 V.
5 Cont input Control voltage input, typically 10.0 V at Vcc=15 V and 3.3 V at Vcc=5 V, used to modulate pulse width or position.
6 Thres input Threshold input; output goes low when threshold voltage exceeds 2/3 Vcc, with threshold current max 250 nA at Vcc=15 V.
7 Disch passive Discharge pin (open-collector discharge switch) for the timing capacitor, with off leakage max 100 nA and saturation voltage max 480 mV at Vcc=15 V, Idis=15 mA.
8 VCC power_in Positive supply pin, operating range 4.5 V to 15 V (absolute maximum 18 V).

Key specifications

Parameter Value
Manufacturer HGSEMI
Package MSOP-8
Category Clock/Timing
Pins 8

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Supply voltage (absolute maximum) VCC 18 V 3
Output current (absolute maximum) Io -220 220 mA 3
Power dissipation PD 400 mW 3
Operating temperature LM555I TA -40 85 °C LM555I 3
Storage temperature TS -65 150 °C 3
Soldering temperature TW 260 °C 10s 3
Supply voltage (recommended) VCC 4.5 15 V 3
Output current (recommended) Io -200 200 mA 3
Operating voltage VCC 4.5 15 V TA=25°C 4
Supply current ICC 3 6 mA VCC=5V, RL=∞, VO=VOL 4
Supply current ICC 1.5 5 mA VCC=5V, RL=∞, VO=VOH 4
Supply current ICC 8 15 mA VCC=15V, RL=∞, VO=VOL 4
Supply current ICC 6 13 mA VCC=15V, RL=∞, VO=VOH 4
Control voltage VCL 10 11 V VCC=15V 4
Control voltage VCL 3.3 4 V VCC=5V 4
Threshold voltage VTH 10 11.2 V VCC=15V 4
Threshold voltage VTH 3.3 4.2 V VCC=5V 4
Threshold current ITH 250 nA VCC=15V, VTH=0V 4
Trigger voltage VTRIG 5 5.6 V VCC=15V 4
Trigger voltage VTRIG 1.6 2.2 V VCC=5V 4
Trigger current ITRIG 2 uA VCC=15V, VTRIG=0V 4
Reset high voltage VRESETH 1.5 V VCC=5V 4
Reset low voltage VRESETL 0.5 V VCC=5V 4
Reset current IRESET 0.13 0.4 mA VRESET=0.4V, VCC=15V 4
Reset current IRESET 0.3 1.5 mA VRESET=0V, VCC=15V 4
Output low voltage VOL 0.02 0.25 V VCC=15V, IL=-5mA 4
Output low voltage VOL 0.04 0.75 V VCC=15V, IL=-50mA 4
Output low voltage VOL 2 2.5 V VCC=15V, IL=-100mA 4
Output low voltage VOL 2.8 V VCC=15V, IL=-200mA 4
Output low voltage VOL 0.08 0.35 V VCC=5V, IL=-5mA 4
Output low voltage VOL 0.15 0.4 V VCC=5V, IL=-8mA 4
Output high voltage VOH 12.75 13.3 V VCC=15V, IL=-100mA 4
Output high voltage VOH 12.2 V VCC=15V, IL=-200mA 4
Output high voltage VOH 2.75 3.3 V VCC=5V, IL=-100mA 4
Discharge transistor off leakage current Idis(off) 100 nA VO=VOH, Vdis=10V 4
Discharge transistor saturation voltage Vdis(sat) 140 480 mV VO=VOL, VCC=15V, Idis=15mA 4
Discharge transistor saturation voltage Vdis(sat) 100 200 mV VO=VOL, VCC=5V, Idis=4.5mA 4
Output rise time tR 80 300 ns CL=15pF 4
Output fall time tF 50 300 ns CL=15pF 4

CAD (KiCad official)

  • Symbol: LM555IMM
  • Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
  • 3D model: MSOP-8 (KiCad packages3D, STEP)
  • 3D model files: lm555imm-etched.step / lm555imm-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm555imm.step / lm555imm.glb are the bare package body.

Provenance

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

  • Datasheet: HGSEMI datasheet (11 pp, sha256 625d5aa31573226e, retrieved 2026-10-22, 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-sonnet-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