Product Summary

The NE556 dual precision timer provides two independent timing circuits in each package. The circuit NE556 can be operated in the astable or the monostable mode with external resistor-capacitor (RC) timing control. The basic timing provided by the RC time constant can be controlled actively by modulating the bias of the control-voltage input. The applications of the NE556 include: (1)Precision Timers From Microseconds to Hours; (2)Pulse-Shaping CIrcuits; (3)Missing-Pulse Detectors; (4)Tone-Burst Generators; (5)Pulse-Width Modulators; (6)Pulse-Position Modulators; (7)Sequential Timers; (8)Pulse Generators; (9)Frequency Dividers; (10)Application Timers; (11)Industrial Controls; (12)Touch-Tone Encoders.

Parametrics

NE556 absolute maximum ratings: (1)Supply voltage, VCC: 18 V; (2)Input voltage (CONT, RESET, THRES, and TRIG): VCC; (3)Output current: ±225 mA; (4)Package thermal impedance, θJA (see Notes 2 and 3): D package: 86℃/W; N package: 80℃/W; NS package: 76℃/W; (5)Package thermal impedance, θJC: J package: 15.05℃/W; (6)Operating virtual junction temperature, TJ: 150℃; (7)Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: J package: 300℃; (8)Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D, N, or NS package: 260℃; (9)Storage temperature range, Tstg: –65℃ to 150℃.

Features

NE556 features: (1)Two Precision Timing Circuits Per Package; (2)Astable or Monostable Operation; (3)TTL-Compatible Output Can Sink or Source Up To 150 mA; (4)Active Pullup or Pulldown; (5)Designed to Be Interchangeable With Signetics NE556, SA556, and SE556.

Diagrams

NE556 functional block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
NE556DX
NE556DX

Fairchild Semiconductor

Timers & Support Products

Data Sheet

Negotiable 
NE556NSRG4
NE556NSRG4

Texas Instruments

Timers & Support Products Dual Prec Timer

Data Sheet

0-1: $0.26
1-25: $0.21
25-100: $0.18
100-250: $0.16
NE556NSRE4
NE556NSRE4

Texas Instruments

Timers & Support Products DUAL PRECISION TIMER

Data Sheet

0-1: $0.26
1-25: $0.21
25-100: $0.18
100-250: $0.16
NE556DT
NE556DT

STMicroelectronics

Timers & Support Products General Purpose Dual

Data Sheet

0-1: $0.14
1-10: $0.12
10-100: $0.11
100-250: $0.10
NE556NSR
NE556NSR

Texas Instruments

Timers & Support Products Dual Precision

Data Sheet

0-1: $0.36
1-25: $0.25
25-100: $0.21
100-250: $0.19
NE556NE4
NE556NE4

Texas Instruments

Timers & Support Products DUAL PRECISION TIMER

Data Sheet

0-1: $0.36
1-25: $0.25
25-100: $0.21
100-250: $0.19
NE556N
NE556N

Texas Instruments

Timers & Support Products Dual Precision

Data Sheet

0-1: $0.27
1-25: $0.23
25-100: $0.17
100-250: $0.17
NE556DRG4
NE556DRG4

Texas Instruments

Timers & Support Products Dual Prec Timer

Data Sheet

0-1: $0.24
1-25: $0.19
25-100: $0.16
100-250: $0.14