NE555D3 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments NE555D3 is a single precision timer IC generating monostable and astable pulses from microseconds to hours using one external RC network. It operates from 4.5 V to 15 V, sources or sinks 200 mA output current, and fits in a compact small-outline package. Available in stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- NE555D3 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Monostable and astable timing modes with a single external RC network, setting pulse widths from 1 µs to over 1 hour with timing accuracy better than 1% per degree Celsius
- Output stage capable of sourcing or sinking 200 mA drives LEDs, relays, and CMOS logic directly without buffer transistors
- Operates from 4.5 V to 15 V wide supply range and is compatible with TTL and CMOS logic levels, making it suitable across 5 V and 12 V industrial power rails
Applications
The NE555D3 is used in pulse-width modulation circuits, missing-pulse detectors, and precision time-delay generators where a simple resistor-capacitor network sets timing from 1 µs to over 1 hour without a microcontroller. Its 200 mA output current capability makes it suitable for LED flashers, buzzer drivers, and relay control circuits in consumer electronics, industrial timers, and automotive interior lighting. The device is also widely used in educational prototyping, function generators, and clock signal conditioning for TTL and CMOS logic circuits.
Specifications
| YTEOL | 0 |
| Analog IC - Other Type | TIMER |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What supply voltage range does NE555D3 support and which output current can it drive directly?
The NE555D3 operates from 4.5 V to 15 V, covering both 5 V TTL systems and 12 V automotive or industrial supply rails. Its output stage can source or sink up to 200 mA, which is sufficient to drive a standard 20 mA LED, a small relay coil, a piezo buzzer, or a CMOS logic bus without any additional buffer transistor or driver IC.
How do external resistor and capacitor values determine the oscillation frequency when NE555D3 is wired in astable mode?
In astable mode, frequency is determined by f = 1.44 / ((R1 + 2 x R2) x C), where R1 and R2 are the timing resistors and C is the timing capacitor. Using 10 kOhm for R1, 10 kOhm for R2, and 100 nF for C gives a frequency of approximately 480 Hz. Changing C to 10 µF at the same resistor values reduces frequency to about 4.8 Hz, demonstrating the wide range achievable with standard components.
When is NE555D3 a better choice than a microcontroller for generating a fixed-duration monostable pulse?
For a fixed one-shot pulse duration ranging from 10 µs to several seconds, the NE555D3 requires only 2 passive components and 4.5 V to 15 V supply, whereas a microcontroller needs firmware, a crystal or RC oscillator, and regulated 3.3 V or 5 V. In cost-sensitive or space-constrained designs — such as a debounce timer, door alarm, or relay hold-on circuit — the NE555D3 solution is simpler, cheaper, and immune to firmware bugs.
What package does NE555D3 come in and how does its size compare to the classic DIP-8 version for PCB layout?
The NE555D3 uses a small-outline (SO-8 or equivalent) SMD package, which is significantly smaller than the classic 8-pin DIP package measuring 9.5 mm x 6.5 mm. The SO-8 footprint at approximately 4.9 mm x 3.9 mm with 1.27 mm pitch reduces PCB area by over 60%, enabling compact layouts in consumer products, wearables, and multi-timer boards where through-hole DIP components are no longer practical.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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