NE555
Precision Timer ICThe NE555 is a precision timer ic from Diodes Incorporated. View the full NE555 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
Official NE555 datasheet (PDF) — the source this page was extracted from.
NE555 Key Specifications
| Parameter | Value |
|---|---|
| Quiescent Current | 10 mA |
| Frequency | 100kHz |
| Mounting Type | Surface Mount |
| Operating Temperature | 0°C ~ 70°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Packaging | MouseReel |
| Standard Pack Qty | 2500 |
| Supplier Device Package | 8-SOIC |
| Type | 555 Type, Timer/Oscillator (Single) |
| Supply Voltage | 4.5V ~ 16V |
NE555 Overview
Part: NA555, NE555, SA555, SE555 (xx555 Precision Timers) — Texas Instruments
Type: Precision Timer (Monostable/Astable)
Description: Precision timing circuit for 4.5–16 V supply (18 V for SE555) with ±200 mA output sink/source, timing from microseconds to hours, and TTL-compatible output at 5 V supply.
Operating Conditions:
- Supply voltage: 4.5–16 V (NA555, NE555, SA555); 4.5–18 V (SE555)
- Operating temperature: 0 to 70 °C (NE555); suffix-dependent: NA555 -40 to 105 °C, SA555 -40 to 85 °C, SE555 -55 to 125 °C
- Output current: ±200 mA max
Absolute Maximum Ratings:
- Max supply voltage: 18 V
- Max output current: ±225 mA
- Max junction temperature: 150 °C
- Storage temperature: -65 to 150 °C
- Input voltage (CONT, RESET, THRES, TRIG): VCC
Key Specs:
- THRES voltage level (VCC = 15 V, TA = 25 °C): 8.8–11.2 V (NA/NE/SA555), typ 10 V
- TRIG voltage level (VCC = 15 V): 4.5–5.6 V (NA/NE/SA555), typ 5 V
- TRIG current (TRIG at 0 V): typ 0.5 μA, max 2 μA (NA/NE/SA555)
- RESET voltage level: 0.3–1 V, typ 0.7 V
- Output low voltage (VCC = 15 V, IOL = 10 mA): typ 0.1 V, max 0.25 V (NA/NE/SA555)
- Output high voltage (VCC = 15 V, IOH = -100 mA): min 12.75 V, typ 13.3 V (NA/NE/SA555)
- Supply current, output low, no load: typ 10 mA, max 15 mA at VCC = 15 V; typ 3 mA, max 6 mA at VCC = 5 V (NA/NE/SA555)
- Output rise/fall time (CL = 15 pF, 25 °C): typ 100 ns, max 300 ns (NA/NE/SA555)
- Timing temperature coefficient, monostable: typ 50 ppm/°C (NA/NE/SA555)
- Supply-voltage sensitivity of timing, monostable: typ 0.1 %/V, max 0.5 %/V (NA/NE/SA555)
Features:
- Timing from microseconds to hours
- Astable or monostable operation
- Adjustable duty cycle
- TTL-compatible output can sink or source up to 200 mA
Applications:
- Pulse-shaping circuits
- Missing-pulse detectors
- Pulse-width and 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)
NE555 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.
NE555 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
NE555 Pin Configuration
NC - No internal connection
Table 4-1. Pin Functions
| PIN - NAME | PIN - NO. | PIN - NO. | ||
|---|---|---|---|---|
| NAME | D (SOIC), P (PDIP), PS (SO), PW (TSSOP), JG (CDIP) | FK (LCCC) | TYPE | DESCRIPTION |
| CONT | 5 | 12 | Input/output | Controls comparator thresholds, Outputs 2/3 × VCC, allows bypass capacitor connection |
| DISCH | 7 | 17 | Output | Open collector output to discharge timing capacitor |
| GND | 1 | 2 | - | Ground |
| NC | - | 1, 3, 4, 6, 8, 9, 11, 13, 14, 16, 18, 19 | - | No internal connection |
| OUT | 3 | 7 | Output | High current timer output signal |
| RESET | 4 | 10 | Input | Active low reset input forces output and discharge low. |
| THRES | 6 | 15 | Input | End of timing input. THRES > CONT sets output low and discharge low |
| TRIG | 2 | 5 | Input | Start of timing input. TRIG < ½ CONT sets output high and discharge open |
| V CC | 8 | 20 | - | Input supply voltage, 4.5V to 16V. SE555 maximum is 18V. |
NE555 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 |
NE555 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 |
NE555 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 |
NE555 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 |
NE555 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.
Variants on the same datasheet
These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.
| Part Number | Manufacturer | Package |
|---|---|---|
| NE555P | Texas Instruments | 8-DIP (0.300", 7.62mm) |
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