MC1455P1G - 555 Timer, 4.5-16V, 8-PDIP | onsemi
MPN: MC1455P1G ✓ نشطMC1455P1G نظرة عامة
A 555 timer is a type of timer IC, oscillator IC, and analog integrated circuit used to generate a time-delayed output or periodic waveform without a microprocessor. Within the broader semiconductor hierarchy, the MC1455 belongs to the timer and oscillator category, which sits within clock and timing integrated circuits and analog signal-processing devices. The device provides a simple hardware mechanism for delays, pulse generation, flashing, tone generation, and periodic control.
The principal advantages of the MC1455P1G include its direct-replacement positioning for NE555 timers, adjustable duty-cycle capability, separate trigger and reset control, and operation from a single 4.5 V to 16 V supply. Its timing interval is established by one external resistor and capacitor in monostable mode, while astable operation adds the resistor and capacitor connections required to set frequency and duty cycle. These features make the circuit useful in designs where a dedicated timer simplifies control logic.
Internally, the MC1455 uses comparator and switching functions to control its discharge, output, trigger, and reset behavior. In monostable operation, a trigger pulse starts one controlled timing interval and then returns the output to its inactive state. In astable operation, the output oscillates continuously, with frequency and duty cycle determined by the external timing network. The manufacturer describes the MC1455 as a highly stable monolithic timing controller, while its trigger and reset terminals support externally controlled operation.
Typical uses include LED flashers, interval timers, pulse generators, industrial control timers, switch debounce circuits, simple audio oscillators, and embedded control systems requiring a repeatable hardware timing event. Because the MC1455P1G is a through-hole PDIP device, it is particularly suitable for prototyping, educational assemblies, legacy industrial equipment, and repair designs where a socketed DIP implementation simplifies maintenance.
For new layouts, preserve the standard 8-pin timer interface and place timing components close to the relevant pins to reduce parasitic effects. Check trigger and reset pulse timing, discharge-device current, and output-load conditions before finalizing the circuit. A bypass capacitor near the supply pin is recommended when the long timing interval and high timing accuracy required by the design are important.
This product record combines manufacturer functional information, package and supply details, cross-reference candidates, and practical design guidance. It also distinguishes verified device attributes from electrical parameters that still require confirmation in the manufacturer datasheet, helping engineers plan a replacement without overlooking timer behavior, package compatibility, or application-level constraints.
بدائل مباشرة لـ MC1455P1G — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع MC1455P1G (نفس عامل الشكل والبصمة) — يختلف في Mounting Type, Package, Product Type.
NE555P
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←NE555N
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
MC1455P1G المواصفات
| Product Type | 555-type monolithic timer and oscillator |
| Timer Configuration | Monostable and astable operation |
| Supply Voltage Range | 4.5 V to 16 V |
| نوع الخرج | Adjustable-duty-cycle timer output |
| Timing Elements | 1 external resistor and 1 external capacitor in time-delay mode |
| Trigger Function | External trigger terminal |
| Reset Function | External reset terminal |
| العلبة | 8-pin PDIP |
| عدد الأطراف | 8 pins |
| نوع التركيب | Through-hole DIP |
دليل تكوين أطراف MC1455P1G 8-pin pdip
تكوين الأطراف لـ MC1455P1G (حزمة 8-pin pdip). يتم تعريف ترقيم الأطراف والوظائف ومخططات التوصيل في ورقة البيانات الفنية من الشركة المصنعة. راجعها للحصول على البصمة الدقيقة وإرشادات اللحام.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ MC1455P1G.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
MC1455P1G مناسب لـ 6 التطبيقs: LED Flasher Circuits, Adjustable Pulse Generators, Industrial Delay and Retrigger Circuits, Simple Audio Tone Generators, Legacy Control-System Repairs, Switch Debounce and Pulse Conditioning.
LED Flasher Circuits
The MC1455P1G suits an LED flasher because its astable operating mode can repeatedly charge and discharge an external timing capacitor, creating a continuous oscillation. A single external resistor and capacitor establish the basic repetition interval, while the output drives a transistor or other current-limiting stage that switches the LED. Because the device operates from 4.5 V to 16 V, it can serve in several industrial, educational, and legacy control systems. The output drive limits, LED current, and maximum oscillation frequency should be confirmed in the onsemi datasheet. In particular, select a series resistor or constant-current driver for the LED and verify that the transistor or buffer remains compatible with the timer output voltage and current.
موصى به
Adjustable Pulse Generators
The MC1455P1G can act as a monostable pulse generator when a trigger starts a fixed interval and the timer automatically returns to its stable state after the resistor-capacitor timing period. This behavior is useful for retriggerable alarms, test-sequence stages, actuator delays, and one-shot control events. The onsemi MC1455 documentation identifies accurate time-delay operation using one external resistor and one external capacitor. Designers should calculate the timing network for the desired interval, confirm the permitted trigger and reset pulse timing, and ensure that the driven load remains within the device output ratings. The DIP package also supports straightforward socketed prototyping and field replacement in older control systems.
موصى به
Industrial Delay and Retrigger Circuits
The MC1455P1G is appropriate for industrial delay and retrigger functions because it combines a stable timing core with dedicated trigger and reset terminals. A sensor edge can initiate the interval, while a separate reset path provides an emergency or supervisory termination function. This arrangement supports delayed starts, dwell timers, sequence interlocks, and alarm annunciation in equipment built with discrete logic. The documented 4.5 V to 16 V supply range provides compatibility with conventional industrial control voltages. Before implementation, verify reset behavior, minimum trigger-pulse width, output-source and sink limits, and temperature tolerance in the manufacturer datasheet. Include a supply bypass capacitor near the IC to reduce noise on a rail that controls timing-sensitive process equipment.
موصى به
Simple Audio Tone Generators
The MC1455P1G can form the oscillator section of a simple audio tone generator in astable mode. The external resistor-capacitor network determines the repetition rate, and the timer's output can drive a transistor stage or an audio amplifier. Its adjustable-duty-cycle operation provides design flexibility beyond a fixed pulse waveform, while the 4.5 V to 16 V supply range allows operation from common low-voltage rails. For an audible result, confirm the usable frequency range and waveform symmetry in the onsemi datasheet, then select values that do not exceed the specified timing limits. A series output component and transistor base or gate resistor may be required to control loading and prevent excessive distortion. The through-hole package makes this arrangement especially convenient in educational and legacy audio fixtures.
موصى به
Legacy Control-System Repairs
The MC1455P1G is particularly useful for maintaining legacy equipment that uses an 8-pin PDIP 555 timer socket. Its documented direct-replacement relationship to NE555 timers supports repair work where component interchangeability and standard pin arrangement are important. The part provides trigger and reset inputs, astable and monostable operating modes, and adjustable duty-cycle behavior, making it suitable for timing blocks in older industrial controllers, test fixtures, and laboratory equipment. Before replacing a device, compare the original part's supply voltage, timing tolerance, output current, maximum frequency, and pin orientation with the onsemi documentation. Socketed construction also permits straightforward replacement, although the timing capacitor and discrete components around the socket should be inspected for leakage, drift, or damage during a full repair.
موصى به
Switch Debounce and Pulse Conditioning
The MC1455P1G can condition a mechanical-switch or sensor event into a clean, fixed-duration pulse by using monostable operation. The trigger input accepts the event, and the output changes state for the selected timing interval, helping prevent multiple unintended responses from contact bounce or a noisy transition. This function is useful in control panels, counter inputs, and legacy automation equipment. Calculate the external timing network for the required debounce or pulse width, and verify the trigger thresholds and minimum pulse duration in the manufacturer datasheet. Add hysteresis or filtering at the input if the source is particularly noisy. Also confirm the output-drive capability and keep the signal path away from high-current switching stages to reduce false triggering.
موصى به
بيانات مرجعية هندسية لـ MC1455P1G — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | NE555P | NE555N |
|---|---|---|---|
| Brand | onsemi | onsemi | onsemi |
| Package | 8-pin PDIP | 8-pin PDIP | 8-pin PDIP |
| Product Type | 555-type monolithic timer and oscillator | Standard single timer | Standard single timer |
| Operating Modes | Monostable and astable | Monostable and astable | Monostable and astable |
| Trigger Control | External trigger terminal | Trigger terminal | Trigger terminal |
| Reset Control | External reset terminal | Reset terminal | Reset terminal |
أبرز الفروقات
- Documented adjustable-duty-cycle operation (مقابلNE555P)
- Documented supply-voltage range (مقابلNE555N)
- Direct NE555 replacement positioning (مقابلNE555P)
ملاحظات التصميم
Do not assume every 8-pin timer is electrically interchangeable. Before substituting NE555P or NE555N for MC1455P1G, compare supply-voltage limits, output source and sink current, maximum operating frequency, trigger thresholds, reset pulse requirements, and timing tolerance. The package and core timer functions match, but those electrical checks determine whether a replacement is safe in the original circuit.
Place the timing resistor and capacitor close to the timing and threshold connections identified in the onsemi pin description, and keep the timing node away from noisy switching nodes. If the design uses a socket, inspect the socket contacts for oxidation because intermittent resistance can change oscillator frequency or monostable delay. Route the reset and trigger traces away from high-current outputs to prevent false triggering.
Add a local supply bypass capacitor near the timer supply pin and ground return, with the trace arranged to minimize loop area. Confirm the selected capacitor voltage rating and leakage against the required 4.5 V to 16 V operating range and timing accuracy. Use a separate regulated source or adequate filtering if the timer shares a rail with switching converters or inductive loads that create large transients.
معلومات الامتثال
The onsemi MC1455 product page and datasheet were identified, but no specific RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration was stated in the cited text.
