LM555CN - 100kHz Single Timer | DIP-8 | Timing Control
MPN: LM555CN ✓ AktifLM555CN Ringkasan
A 555 timer is a general-purpose timing controller within the broader clock and timing IC category. Its internal architecture combines a voltage reference, voltage comparators, a flip-flop, and a high-current output stage. Two resistors and one capacitor set the astable frequency and duty cycle, while one resistor and one capacitor set the monostable pulse delay.
Key verified characteristics include a 4.5 V to 16 V supply range, a maximum frequency of 100 kHz, TTL-compatible interfacing, and support for both astable and monostable operation. The LM555CN is supplied as an 8-DIP device, matching the classic through-hole timer footprint and making it suitable for legacy control boards, educational hardware, prototypes, and repair applications.
In astable mode, the output oscillates continuously between two threshold levels set by the external timing network. In monostable mode, a low-going trigger starts one timing cycle and produces a timed output pulse. The reset input can force the timer into its stable state, while the output stage provides the drive needed for standard digital logic loads.
Typical applications include pulse generation, delay circuits, oscillators, debounce timers, PWM generation, LED flashers, and industrial control pulse shaping. Because the DIP package exposes all eight pins, the device is also convenient for breadboard prototyping and timing experiments where a surface-mount package would be inconvenient.
When designing a replacement circuit, verify trigger polarity, output polarity, output-drive requirements, and timing tolerance rather than assuming every 555 variant is electrically identical. CMOS alternatives may have lower supply current but different output-drive and timing characteristics, while bipolar alternatives generally provide stronger output sourcing and sinking capability.
This page combines the verified LM555CN supply, package, frequency, and timing-mode information with same-footprint alternatives, application guidance, and practical selection criteria that are not consolidated in a single manufacturer datasheet.
Pilihan pengganti yang segera untuk LM555CN — sama paket, pin-pin kompatibel. Bahagian paket yang berbeza memerlukan kerja ulang PCB diasingkan.
Varietas dalam siri ini
Model serupa yang kompatibel dengan pengganti yang segera LM555CN (sama faktor bentuk dan kaki) — berbeza dalam Package, Mounting Type, Operating Modes, Output Compatibility, RoHS Status.
LM555CN/NOPB
✅ Masuk Drop-In📋 Alternatif rujukan (tidak dalam katalog)
TS555CN
✅ Masuk Drop-InHubungi untuk harga
Lihat Datasheet →NE555N
✅ Masuk Drop-In📋 Alternatif rujukan (tidak dalam katalog)
NE555N
✅ Masuk Drop-In📋 Alternatif rujukan (tidak dalam katalog)
LMC555CN
✅ Masuk Drop-In📋 Alternatif rujukan (tidak dalam katalog)
LM555CN Spesifikasi
| Timer Type | Single 555 timer / oscillator |
| Supply Voltage Range | 4.5 V to 16 V |
| Maximum Frequency | 100 kHz |
| Operating Modes | Astable and monostable |
| Logic Compatibility | TTL compatible |
| Kemasan | 8-pin DIP, 8-DIP |
| Jenis Pemasangan | Through-hole |
| Reset Function | Active-low reset control |
Konfigurasi Pin LM555CN
| Pin 1 | GND — Ground reference |
| Pin 2 | TRIGGER — Low-voltage trigger input |
| Pin 3 | OUTPUT — Timer output |
| Pin 4 | RESET — Active-low reset input |
| Pin 5 | CONTROL VOLTAGE — Timing-threshold control input |
| Pin 6 | DISCHARGE — Timing-capacitor discharge node |
| Pin 7 | THRESHOLD — Upper timing-threshold input |
| Pin 8 | VCC — Positive supply input |
Aplikasi Biasa
LM555CN patut untuk 6 aplikasis: Astable Oscillator for LED Flashers, Monostable Pulse and Delay Circuit, PWM and Duty-Cycle Control, Switch Debounce and One-Shot Interface, Industrial Pulse and Retrigger Timer, Audio Tone and Simple Signal Generator.
Astable Oscillator for LED Flashers
The LM555CN fits an astable LED flasher because it continuously alternates its output between low and high states using two external resistors and one timing capacitor. With a verified maximum device frequency of 100 kHz and a 4.5 V to 16 V supply range, it supports conventional 5 V and 12 V indicator circuits. The 8-DIP package is also convenient for breadboard prototypes and legacy repair boards. Design the resistor and capacitor values for the required flash rate, use a current-limiting resistor for the LED, and add local supply decoupling to keep the switching edge from disturbing adjacent circuitry.
Disebarkan
Monostable Pulse and Delay Circuit
The LM555CN is well suited to monostable operation where a trigger must launch one controlled output pulse. A single timing resistor and one timing capacitor establish the delay, while the trigger and reset terminals provide deterministic external control. Its verified 4.5 V to 16 V operating range supports both 5 V logic and higher-voltage industrial control environments. The trigger and output pins are especially useful for interface, sequencing, and actuator-delay designs. Keep the timing capacitor close to the device, account for capacitor leakage and tolerance, and ensure the driven load does not exceed the selected manufacturer's output-current limit.
Disebarkan
PWM and Duty-Cycle Control
The LM555CN can generate pulse-width-modulated control signals by running in astable mode and varying the ratio of the two timing resistors. Its 100 kHz listed maximum frequency provides sufficient headroom for many low-frequency PWM loads and timing-control tasks, while the 8-pin DIP simplifies adjustment and prototyping. The output signal can drive a MOSFET gate driver, logic gate, or interface stage, subject to output-drive and rise-time limits. Use separate resistor adjustment rather than placing a potentiometer in the sensitive timing-capacitor path, and validate duty-cycle accuracy across temperature and supply tolerance.
Disebarkan
Switch Debounce and One-Shot Interface
The LM555CN provides a practical one-shot interface for converting a noisy switch or sensor transition into a clean, fixed-duration digital pulse. The monostable configuration uses one resistor and one capacitor, while the active-low reset and trigger inputs allow the surrounding logic to qualify and cancel the event. The TTL-compatible output is useful when interfacing with older digital control systems operating within the verified 4.5 V to 16 V supply range. Because the DIP exposes every pin, the circuit is easy to prototype and troubleshoot with a logic analyzer, though final production designs should still provide supply decoupling and a defined input state.
Disebarkan
Industrial Pulse and Retrigger Timer
The LM555CN can serve as a basic pulse-forming and retrigger timer in industrial control modules where a 4.5 V to 16 V supply and a direct through-hole replacement are important. Its trigger, threshold, discharge, and reset functions support one-shot timing, while the output provides a standard logic-level timing signal. The DIP package makes it attractive for legacy equipment repairs and controller boards that already use the standard 8-pin footprint. For factory equipment, confirm automotive or extended-temperature qualification requirements from the chosen manufacturer, because the verified data does not state an AEC-Q100 status for this part.
Disebarkan
Audio Tone and Simple Signal Generator
The LM555CN can generate a simple fixed-frequency tone or test waveform in astable mode, making it useful in educational equipment, signal-tracing tools, and basic function generators. Two timing resistors and one capacitor establish the repetition rate, and the TTL-compatible output can drive a small transistor or audio stage after appropriate current buffering. The verified 100 kHz maximum frequency allows operation well above audible frequencies when suitable component values are used. Add a coupling capacitor to block the DC offset from the output, keep the timing network compact, and confirm that the output stage remains within the selected source's drive-current specification.
Disebarkan
Ringkasan Produk Disebarkan
Data referensi kejuruteraan untuk LM555CN — perbandingan, panduan rancangan, dan maklumat kesediaan
Panduan Pilihan
Perbandingan dengan Gantian
| Parametr | Produk Ini | LM555CN/NOPB | TS555CN | NE555N | LMC555CN |
|---|---|---|---|---|---|
| Package | 8-DIP | 8-DIP | 8-DIP | 8-DIP | 8-DIP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments / onsemi | Maxim Integrated |
| Timer Category | Single 555 timer / oscillator | Single 555 timer / oscillator | Single 555 timer / oscillator | Single 555 timer / oscillator | Single CMOS 555 timer / oscillator |
| Operating Modes | Astable and monostable | Astable and monostable | Astable and monostable | Astable and monostable | Astable and monostable |
Penyeberangsung Jelas
- Verified 100 kHz maximum-frequency capability (vsTS555CN)
- Direct 8-DIP legacy compatibility (vsLMC555CN)
- TTL-compatible output for legacy digital systems (vsNE555N)
Catatan Desain
Place the timing resistor and capacitor close to the threshold, trigger, and discharge pins to minimize noise pickup and timing errors. Keep the output trace away from the timing network, and provide a short, low-impedance ground return for the discharge current. For a DIP implementation, route the supply bypass capacitor adjacent to pin 8 and the ground connection adjacent to pin 1.
Do not assume every 555-marked device has identical electrical behavior. Verify trigger polarity, reset polarity, output-drive current, quiescent current, and output rise time against the selected manufacturer's datasheet. A CMOS timer may reduce supply consumption but can offer less output drive than a bipolar 555, so transistor buffering may be required for capacitive or LED loads.
Decouple the supply locally because the LM555CN output can switch abruptly and produce transient current. Use the manufacturer's recommended bypass value plus adequate bulk capacitance for the load. Keep the operating supply within the verified 4.5 V to 16 V range, and avoid placing the timing capacitor directly across a noisy regulator output without local filtering.
Maklumat Kesediaan
The supplied verified search results do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred from the package or manufacturer.
