NE555DR - Precision Timer IC 100kHz SOIC-8 | Texas Instruments
MPN: NE555DR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 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 |
Drop-in alternatives for NE555DR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SA555DR
β Drop-Inπ Reference alternative (not in catalog)
SE555D
β Drop-Inπ Reference alternative (not in catalog)
LMC555CD
β Drop-Inπ Reference alternative (not in catalog)
TLC555CDR
β Drop-Inπ Reference alternative (not in catalog)
TS555CD
β Drop-Inπ Reference alternative (not in catalog)
ICM7555
β Drop-Inπ Reference alternative (not in catalog)
NE555DR Maximum Ratings & Electrical Characteristics
| Function | 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 |
| Package | SOIC-8 (D) |
| Mounting Type | Surface Mount |
| Number of Timers | 1 |
| Technology | Bipolar |
| RoHS Status | Compliant |
| Compliance | MIL-PRF-38535 (on qualifying products) |
| Reel Size | 2500 units |
NE555DR Pin Configuration
| Pin 1 | GND β Ground reference |
| Pin 2 | TRIG β Trigger input, fires when below 1/3 VCC |
| Pin 3 | OUT β Output, sinks or sources up to 200 mA |
| Pin 4 | RESET β Active-low reset, overrides all other inputs |
| Pin 5 | CTRL β Control voltage, accesses internal 2/3 VCC divider |
| Pin 6 | THRES β Threshold input, resets latch above 2/3 VCC |
| Pin 7 | DISCH β Discharge pin for timing capacitor |
| Pin 8 | VCC β Supply voltage, 4.5V to 16V |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
NE555DR is suitable for 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for NE555DR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
| Quiescent Current | [DATA_NEEDED] | [DATA_NEEDED] | ~170 uA typ | ~110 uA typ | ~60 uA typ |
| 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 |
Key Differentiators
- 200 mA output drive (vs TLC555CDR)
- Lower supply current option exists in family (vs NE555DR)
- Extended temperature automotive variant (vs SA555DR)
Design Notes
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.
Compliance Information
RoHS compliant per DigiKey listing. MIL-PRF-38535 compliance applies to qualifying products per TI datasheet.
