| Part No. | Features | Function (勾選方式) | Number of Channels | Vcc (V)Min | Vcc (V)Max | Iq (mA) | Package |
| C555 | Single Timer * Timing from microseconds through hours * High speed operation – 500kHz * Wide operation supply voltage range – 7 to 15 voltages * Low Supply Current －0.2mA * Operates in both astable and monostable modes * High output source/sink driver can drive TTL / CMOS * Adjustable duty cycle | * Low Supply Current * Adjustable duty cycle | 1 | 7 | 15 | 0.6 | DIP-8 SOP-8 MSOP-8 |
| LM556 | Dual Timer *High Current Driver Capability(=200mA) *Adjustable Duty Cycle *Timing From μSec to Hours *Temperature Stability of 0.005%/°C *TTL Compatible *Operates in Both Astable and Monostable Modes | * High output source/sink drive * Adjustable duty cycle | 2 | 4.5 | 16 | 30 | DIP-14 SOP-14 |
| NE555 | Single Timer *High current driver capability (=200mA). *Adjustable duty cycle. *Timing From μSec to Hours *Turn off time less than 2 μs. *Operates in both astable and monostable modes. | * High output source/sink drive * Adjustable duty cycle | 1 | 4.5 | 16 | 15 | DIP-8 SOP-8 TSSOP-8 |
| USA555 | Precision Timer * Astable or monostable operation * Low turn off time * Operates in both astable and monostable modes * Timing from microseconds to hours * Adjustable duty cycle * TTL-compatible output can sink or source up to 200mA | * High output source/sink drive * Adjustable duty cycle | 1 | 4.5 | 16 | 15 | DIP-8 SOP-8 |
