NE555
Precision Timer ICThe NE555 is a precision timer ic from Diodes Incorporated. View the full NE555 datasheet below including key specifications, pinout, electrical characteristics, absolute maximum ratings.
Manufacturer
Diodes Incorporated
Category
Precision Timer IC
Package
SOIC-8, PDIP-8, SO-8, TSSOP-8
Key Specifications
| Parameter | Value |
|---|---|
| Current - Output High, Low | 8mA, 8mA |
| Current - Output High, Low | 8mA, 8mA |
| Current - Output High(IOH) | 8mA |
| Current - Output High(IOH) | 8mA |
| Current - Output High(IOH) | 8mA |
| Current - Output High(IOH) | 8mA |
| Current - Output Low(IOL) | 8mA |
| Current - Output Low(IOL) | 8mA |
| Current - Output Low(IOL) | 8mA |
| Current - Output Low(IOL) | 8mA |
| Current - Quiescent (Max) | 1 µA |
| Current - Quiescent (Max) | 1 µA |
| Features | Noise suppression function |
| Features | Noise suppression function |
| Features | Schmitt Trigger |
| Features | Schmitt Trigger |
| Features | Noise suppression function |
| Features | Noise suppression function |
| Input Logic Level - High | 2.2V~3.85V |
| Input Logic Level - High | 2.2V~3.85V |
| Input Logic Level - High | 2.2V ~ 3.85V |
| Input Logic Level - High | 2.2V ~ 3.85V |
| Input Logic Level - High | 2.2V~3.85V |
| Input Logic Level - High | 2.2V~3.85V |
| Input Logic Level - Low | 900mV~1.65V |
| Input Logic Level - Low | 0.9V ~ 1.65V |
| Input Logic Level - Low | 900mV~1.65V |
| Input Logic Level - Low | 900mV~1.65V |
| Input Logic Level - Low | 0.9V ~ 1.65V |
| Input Logic Level - Low | 900mV~1.65V |
| Input Type | Schmitt trigger |
| Logic Family | 74AHC |
| Logic Family | 74AHC |
| Logic Family | 74AHC |
| Logic Family | 74AHC |
| Logic Type | Inverter |
| Logic Type | Inverter |
| Max Propagation Delay @ V, Max CL | 10.6ns @ 5V, 50pF |
| Max Propagation Delay @ V, Max CL | 10.6ns @ 5V, 50pF |
| Mounting Type | Surface Mount |
| Number of Channels | 1 |
| Number of Channels | 1 |
| Number of Channels | 1 |
| Number of Channels | 1 |
| Number of Circuits | 1 |
| Number of Circuits | 1 |
| Number of Inputs | 1 |
| Operating Temperature | -40°C ~ 125°C |
| Operating Temperature | -40℃~+125℃ °C |
| Output Logic Level - High | 3.94V |
| Output Logic Level - High | 3.94V |
| Output Logic Level - High | 3.94V |
| Output Logic Level - High | 3.94V |
| Output Logic Level - Low | 550mV |
| Output Logic Level - Low | 550mV |
| Output Logic Level - Low | 550mV |
| Output Logic Level - Low | 550mV |
| Package / Case | SC-74A, SOT-753 |
| Propagation Delay | 10.6ns@5V,50pF |
| Propagation Delay | 10.6ns@5V,50pF |
| Propagation Delay | 10.6ns@5V,50pF |
| Propagation Delay | 10.6ns@5V,50pF |
| Quiescent Current(Iq) | 1uA |
| Quiescent Current(Iq) | 1uA |
| Quiescent Current(Iq) | 1uA |
| Quiescent Current(Iq) | 1uA |
| Supplier Device Package | SOT-23-5 |
| Supplier Device Package | SOT-23-5 |
| Supply Voltage | 2V ~ 5.5V |
| Supply Voltage | 2V~5.5V |
Overview
Part: xx555 Precision Timers (NA555, NE555, SA555, SE555 variants)
Type: Precision Timer
Description: Precision timing circuits capable of producing accurate time delays or oscillation, supporting astable or monostable operation with an adjustable duty cycle, and a TTL-compatible output that can sink or source up to 200mA.
Operating Conditions:
- Supply voltage: NA555, NE555, SA555: 4.5–16 V; SE555: 4.5–18 V
- Operating temperature: NA555: -40 to 105 °C; NE555: 0 to 70 °C; SA555: -40 to 85 °C; SE555: -55 to 125 °C
- Max output current: ±200 mA
Absolute Maximum Ratings:
- Max supply voltage: 18 V
- Max continuous current: ±225 mA
- Max junction/storage temperature: 150 °C
Key Specs:
- THRES voltage level (VCC=15V): Typ 10 V
- TRIG voltage level (VCC=15V): Typ 5 V
- Output low voltage (VCC=15V, IOL=10mA): Typ 0.1 V
- Output low voltage (VCC=15V, IOL=100mA): Typ 2 V
- Output high voltage (VCC=15V, IOH=-100mA): Typ 13.3 V
- Supply current (Output low, no load, VCC=15V): Typ 10 mA
- Output-pulse rise time (CL=15pF, TA=25°C): Typ 100 ns
- Output-pulse fall time (CL=15pF, TA=25°C): Typ 100 ns
Features:
- Timing from microseconds to hours
- Astable or monostable operation
- Adjustable duty cycle
- TTL-compatible output can sink or source up to 200mA
Applications:
- Pulse-shaping circuits
- Missing-pulse detectors
- Pulse-width modulators
- Pulse-position modulators
- Sequential timers
- Pulse generators
- Frequency dividers
- Industrial controls
Package:
- D (SOIC, 8)
- P (PDIP, 8)
- PS (SO, 8)
- PW (TSSOP, 8)
- FK (LCCC, 20)
- JG (CDIP, 8)
Features
- Timing from microseconds to hours
- Astable or monostable operation
- Adjustable duty cycle
- TTL-compatible output can sink or source up to 200mA
- On products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted. On all other products, production processing does not necessarily include testing of all parameters.
Applications
- Pulse-shaping circuits
- Missing-pulse detectors
- Pulse-width modulators
- Pulse-position modulators
- Sequential timers
- Pulse generators
- Frequency dividers
- Industrial controls
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Simplified Schematic
Pin Configuration
NE555 Pinout – SOIC-8 (D Package)
| Pin Number | Pin Name | Type | Description |
|---|---|---|---|
| 1 | GND | P | Ground |
| 2 | TRIG | I | Trigger Input |
| 3 | OUT | O | Output |
| 4 | RESET | I | Reset (active low) |
| 5 | CONT | I | Control Voltage |
| 6 | THRES | I | Threshold Input |
| 7 | DISCH | O | Discharge |
| 8 | VCC | P | Supply Voltage |
Notes
- Package: SOIC-8 (D package) — 8-pin dual in-line surface-mount package
- Pin 5 (CONT): Control voltage input; typically bypassed to ground with a 0.01 µF capacitor
- Pin 4 (RESET): Active-low reset; tie to VCC for normal operation
- Pins 2 & 6 (TRIG/THRES): Often connected together for astable operation
- Pin 7 (DISCH): Open-collector discharge output; typically connected to timing capacitor
- All pin numbers extracted from the D (SOIC) package diagram shown in the datasheet
Electrical Characteristics
at V CC = 5V to 15V and TA = 25°C (unless otherwise noted)
| PARAMETER | TEST CONDITIONS | TEST CONDITIONS | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|---|
| THRES voltage level | V CC = 15V | NA555, NE555, SA555 | 8.8 | 10 | 11.2 | V |
| THRES voltage level | SE555 | 9.4 | 10 | 10.6 | V | |
| THRES voltage level | V CC = 5V | NA555, NE555, SA555 | 2.4 | 3.3 | 4.2 | V |
| THRES voltage level | SE555 | 2.7 | 3.3 | 4 | V | |
| THRES current (1) | 30 | 250 | nA | |||
| TRIG voltage level | V CC = 15V | NA555, NE555, SA555 | 4.5 | 5 | 5.6 | V |
| TRIG voltage level | SE555 | 4.8 | 5 | 5.2 | V | |
| TRIG voltage level | V CC = 15V, T A = -55°C to +125°C | SE555 | 3 | 6 | V | |
| TRIG voltage level | V CC = 5V | NA555, NE555, SA555 | 1.1 | 1.67 | 2.2 | V |
| TRIG voltage level | SE555 | 1.45 | 1.67 | 1.9 | V | |
| TRIG voltage level | V CC = 5V, T A = -55°C to +125°C | SE555 | 1.9 | V | ||
| TRIG current | TRIG at 0V | NA555, NE555, SA555 | 0.5 | 2 | μA | |
| TRIG current | SE555 | 0.5 | 0.9 | μA | ||
| RESET voltage level | 0.3 | 0.7 | 1 | V | ||
| RESET voltage level | T A = -55°C to +125°C | SE555 | 1.1 | V | ||
| RESET current | RESET at V CC | RESET at V CC | 0.1 | 0.4 | mA | |
| RESET current | RESET at 0V | NA555, NE555, SA555 | -0.4 | -1.5 | mA | |
| RESET current | SE555 | -0.4 | -1 | mA | ||
| DISCH switch off-state current | 20 | 100 | nA | |||
| DISCH switch on-state voltage | V CC = 5V, I O = 8mA | NA555, NE555, SA555 | 0.15 | 0.4 | V |
Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
| MIN | MAX | UNIT | |||
|---|---|---|---|---|---|
| V CC | Supply voltage (2) | Supply voltage (2) | 18 | V | |
| V I | Input voltage | CONT, RESET, THRES, TRIG | V CC | V | |
| I O | Output current | Output current | ±225 | mA | |
| T J | Operating virtual junction temperature | Operating virtual junction temperature | 150 | °C | |
| Case temperature for 60 seconds | FK package | 260 | °C | ||
| Lead temperature 1.6mm (1/16 inch) from case | JG package, 60 seconds | 300 | °C | ||
| T stg | Storage temperature | Storage temperature | -65 | 150 | °C |
Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
| MIN | MAX | UNIT | |||
|---|---|---|---|---|---|
| V CC | Supply voltage | NA555, NE555, SA555 | 4.5 | 16 | V |
| V CC | SE555 | 4.5 | 18 | V | |
| I O | Output current | Output current | ±200 | mA | |
| T A | Operating free-air temperature | NA555 | -40 | 105 | °C |
| T A | Operating free-air temperature | NE555 | 0 | 70 | °C |
| T A | Operating free-air temperature | SA555 | -40 | 85 | °C |
| T A | Operating free-air temperature | SE555 | -55 | 125 | °C |
Thermal Information
| THERMAL METRIC | (1) | NA556, NE556, SA555, SE555 | SE555 | SE555 | NA555, NE555 | NE555 | NE555 | UNIT |
|---|---|---|---|---|---|---|---|---|
| D (SOIC) | FK (LCCC) | JG (CDIP) | P (PDIP) | PS (SO) | PW (TSSOP) | UNIT | ||
| 8 PINS | 20 PINS | 8 PINS | 8 PINS | 8 PINS | 8 PINS | |||
| R θJA | Junction-to-ambient thermal resistance | 125.4 | 92.2 | 125.0 | 98.5 | 124.5 | 164.2 | °C/W |
| R θJC(top) | Junction-to-case (top) thermal resistance | 64.9 | 67.6 | 73.3 | 77.8 | 61.2 | 70.5 | °C/W |
| R θJB | Junction-to-board thermal resistance | 73.2 | 66.7 | 114.9 | 61.0 | 79.3 | 104.8 | °C/W |
| ψ JT | Junction-to-top characterization parameter | 14.3 | 61.6 | 44.4 | 43.9 | 16.5 | 8.2 | °C/W |
| ψ JB | Junction-to-board characterization parameter | 72.1 | 66.5 | 106.6 | 60.3 | 77.8 | 103.1 | °C/W |
| R θJC(bot) | Junction-to-case (bottom) thermal resistance | N/A | 14.2 | 29.3 | N/A | N/A | N/A | °C/W |
Typical Application
The Nx555 and Sx555 precision timers use resistor and capacitor charging delay to provide a programmable time delay or operating frequency. This section presents a simplified discussion of the design process.
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| NE555P | Texas Instruments | 8-DIP (0.300", 7.62mm) |
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