NE555DR - Precision Timer IC 100kHz SOIC-8 | Texas Instruments
Référence : NE555DR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0.42 | $0,42 |
| 10 | $0.38 | $3,80 |
| 100 | $0.29 | $29,00 |
| 500 | $0.23 | $115,00 |
| 1 000 | $0.19 | $190,00 |
NE555DR Présentation
A 555 timer is a classic analog timer and oscillator IC first introduced in the 1970s. Within the semiconductor hierarchy, it belongs to the clock and timing family: timer IC -> oscillator IC -> analog mixed-signal IC. The 555 architecture uses two comparators, a resistive voltage divider, and a discharge transistor to switch an external RC network, producing precise timing intervals defined by resistor and capacitor values.
Key features include timing from microseconds to hours, astable or monostable operation, adjustable duty cycle, and a TTL-compatible output that can sink or source up to 200 mA - enough to drive LEDs, relays, or small motors directly without a buffer transistor. According to TI, on products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted.
The bipolar process of the NE555 delivers robust drive capability and noise immunity, making it more forgiving in harsh environments than CMOS variants, at the cost of higher supply current (typ. ) and slightly less timing accuracy at temperature extremes. The 100 kHz maximum oscillation frequency covers most low-speed timing, pulse generation, and PWM tasks.
Typical applications include LED flashers and lamp dimmers, pulse width modulation, tone and alarm generation, time-delay generation in industrial control, and clock generation for digital circuits. The SOIC-8 package suits automated assembly on modern PCBs.
Design tip: keep the timing capacitor above 500 pF and use 1% resistors for best timing accuracy; add a 0.1 uF decoupling capacitor close to VCC to prevent supply glitches during output switching.
Alternatives de remplacement direct pour NE555DR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
SA555DR
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
SE555D
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
LMC555CD
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TLC555CDR
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TS555CD
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ICM7555
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
NE555DR Spécifications
| Fonction | 555 Type, Timer/Oscillator (Single) |
| Maximum Frequency | 100 kHz |
| Supply Voltage Range | 4.5 V to 16 V |
| Output Current | 200 mA (sink or source) |
| Operating Modes | Astable, Monostable |
| Timing Range | Microseconds to hours |
| Duty Cycle | Adjustable |
| Output Compatibility | TTL-compatible |
| Boîtier | SOIC-8 (D) |
| Type de montage | Surface Mount |
| Number of Timers | 1 |
| Technology | Bipolar |
| Statut RoHS | Compliant |
| Compliance | MIL-PRF-38535 (on qualifying products) |
| Reel Size | 2500 units |
Configuration des broches de NE555DR
| Broche 1 | GND — Ground reference |
| Broche 2 | TRIG — Trigger input, fires when below 1/3 VCC |
| Broche 3 | OUT — Output, sinks or sources up to 200 mA |
| Broche 4 | RESET — Active-low reset, overrides all other inputs |
| Broche 5 | CTRL — Control voltage, accesses internal 2/3 VCC divider |
| Broche 6 | THRES — Threshold input, resets latch above 2/3 VCC |
| Broche 7 | DISCH — Discharge pin for timing capacitor |
| Broche 8 | VCC — Supply voltage, 4.5V to 16V |
Applications typiques
NE555DR convient pour 6 applications: LED Flasher and Lamp Driver, PWM Motor Speed Control, Time-Delay Generation, Tone and Alarm Generation, Clock Generation for Digital Logic, Sensor Trigger and Debounce Circuits.
LED Flasher and Lamp Driver
In astable mode the NE555DR drives LEDs or lamps directly from its 200 mA TTL-compatible output, eliminating a buffer transistor. Timing from microseconds to hours allows slow warning beacons or fast strobes by choosing the RC network; duty cycle is adjustable for desired on/off ratio. The bipolar output stage withstands the inrush of lamp loads better than CMOS 555 variants, and the 4.5V-16V range covers battery and 12V rail designs.
Recommandé
PWM Motor Speed Control
The NE555DR generates adjustable duty-cycle PWM in astable mode with a diode steering network, letting one potentiometer set motor speed from near 5% to 95%. Its 100 kHz capability supports ultrasonic PWM frequencies, and the 200 mA output directly drives small DC motors or a power MOSFET gate via a driver. Compared with CMOS timers, the bipolar output handles gate-charge transients robustly in noisy industrial environments.
Recommandé
Time-Delay Generation
In monostable mode the NE555DR produces accurate delays from microseconds to hours, set by a single RC pair, ideal for power-on delays, relay timing, and debounce circuits. The active-low RESET pin allows aborting a timing cycle. Timing accuracy depends mainly on the external capacitor; using 1% resistors and low-leakage film capacitors keeps error low across the 4.5V-16V supply range per TI datasheet guidance.
Recommandé
Tone and Alarm Generation
Two NE555DR timers in astable mode - one setting the audio tone near 1 kHz, one modulating it - create sirens, beepers, and alarms. The 200 mA output drives a small loudspeaker directly. The 100 kHz maximum frequency far exceeds the audible band, and the stable 555 architecture keeps tone frequency consistent as supply varies from 4.5V to 16V, unlike relaxation oscillators built from discrete parts.
Recommandé
Clock Generation for Digital Logic
The NE555DR provides a simple RC-set clock for counters, shift registers, and microcontroller-less state machines at up to 100 kHz. The TTL-compatible output interfaces directly with 5V logic families. Adding a 0.1 uF decoupling capacitor and keeping the discharge node short minimizes output glitches during switching, ensuring clean edges for clocked CMOS devices such as CD4017 or SN74-series counters.
Recommandé
Sensor Trigger and Debounce Circuits
The TRIG input of the NE555DR fires monostable pulses from sensor edges - photo-interrupters, reed switches, or limit switches - with a fixed-width pulse that filters contact bounce. The internal comparators compare TRIG against 1/3 VCC, giving a well-defined threshold across the 4.5V-16V range. Output pulses drive relays or logic directly at 200 mA, consolidating debounce, delay, and drive in one 8-pin SOIC package.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour NE555DR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | SA555DR | TLC555CDR | TS555CD | ICM7555 |
|---|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics | Renesas Electronics |
| Supply Voltage | 4.5 V to 16 V | 4.5 V to 16 V | 2 V to 15 V | 2 V to 16 V | 2 V to 18 V |
| Output Current | 200 mA | 200 mA | ~100 mA | ~100 mA | ~100 mA |
| Technology | Bipolar | Bipolar | CMOS | CMOS | CMOS |
| Operating Temperature | 0C to 70C | -40C to +125C | 0C to 70C | -40C to +125C | -40C to +85C |
| Max Frequency | 100 kHz | 100 kHz | 2.1 MHz | 500 kHz | 500 kHz |
Principaux différenciateurs
- 200 mA output drive (vs TLC555CDR)
- Lower supply current option exists in family (vs NE555DR)
- Extended temperature automotive variant (vs SA555DR)
Notes de conception
Bipolar 555 timers draw a supply current spike when the output switches, which can reset neighboring logic. Place a 0.1 uF ceramic capacitor directly across VCC pin 8 and GND pin 1, plus 10 uF bulk capacitance if multiple timers share a rail. Per TI application guidance, the NE555 supply transients can reach 100-200 mA during output transitions.
Do not drive the TRIG pin below 0V or leave RESET pin 4 floating - tie it to VCC through a 10 kOhm resistor if unused. Timing capacitors below 500 pF cause errors from internal comparator delay; use film or NP0 capacitors above that value for stable timing. The CTRL pin 5 can be decoupled with 0.01 uF for noise immunity.
Keep the discharge (pin 7) and threshold (pin 6) traces short and away from the output to prevent parasitic coupling that causes frequency jitter. The 200 mA output should route with adequate trace width (at least 20 mil for 1 oz copper) when driving relays or lamps directly.
Informations de conformité
RoHS compliant per DigiKey listing. MIL-PRF-38535 compliance applies to qualifying products per TI datasheet.
