MC145018P - Low-Power Ionization Smoke Detector IC | NXP
Артикул: MC145018P ✓ АктивенMC145018P Обзор
An ionization smoke detector is an electronic system that senses changes in the electrical behavior of an ionization chamber when smoke enters the chamber. The MC145018P belongs to the broader smoke-detector IC category, where it functions as a sensor interface and alarm-control device. Its internal circuitry connects the chamber to the detection electronics, coordinates the alarm signal, and provides a temporal horn-drive output for compatible sounders.
The principal features include low-power CMOS operation, an ionization-sensor input, a voltage output, an interconnect function, and a temporal horn driver for an external piezoelectric transducer. The interconnect function supports installation schemes in which multiple detector units can be interconnected. The temporal horn driver provides the required switched drive for the alarm transducer rather than requiring a separate general-purpose driver circuit.
The manufacturer identifies the MC145018 family as suitable for smoke-detector systems designed around UL 217 and UL 268 requirements. Its CMOS implementation targets low standby power, an important characteristic for continuously powered household and commercial alarm systems. The 16-pin PDIP package also supports through-hole assembly and inspection of an alarm product that must integrate an ionization chamber, discrete support components, a sound path, and the detector electronics.
Typical applications include residential ionization smoke alarms, interconnected commercial alarm panels, portable detector modules, and retrofit assemblies where a legacy through-hole detector interface must be combined with an external piezoelectric horn. In these systems, the MC145018P handles the sensor-to-alarm path while the external chamber and transducer perform the physical sensing and sound-generation functions.
Designers should follow the manufacturer datasheet for the ionization-chamber interface, interconnect wiring, external component values, test points, and horn-drive network. PCB layout should keep sensitive chamber connections short and isolated from the switched horn output. Adequate spacing between high-impedance sensor traces and buzzer-drive traces helps reduce false triggering, while correct grounding and stable supply bypassing remain essential for dependable alarm operation.
This page organizes the device function, package information, sourcing paths, and design considerations into a focused engineering reference. It also distinguishes verified drop-in alternatives from package or functional substitutes, helping PCB designers avoid assuming that similarly described smoke-detector ICs can share the same footprint and alarm circuitry.
Аналоги без доработки для MC145018P — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Для этого товара нет аналогов без доработки.
Запросить аналогиMC145018P Характеристики
| Product Type | Ionization smoke detector interface IC |
| Sensor Input Type | Ionization chamber input |
| Sensor Output Type | Voltage output |
| Technology | CMOS |
| Power Class | Low-power CMOS |
| Alarm Output | Temporal horn driver for an external piezoelectric transducer |
| Interconnect Function | Supported |
| Количество выводов | 16 pins |
| Number of Terminals | 16 terminals |
| Корпус | 16-pin PDIP |
| Package Code | DIP |
| Package Shape | Rectangular |
| Mounting Method | Through-hole |
| Surface Mount | No |
| Temperature Grade | Commercial |
| Smoke-System Design Reference | UL 217 and UL 268 |
Руководство по цоколевке MC145018P в корпусе rectangular
Цоколевка для MC145018P (корпус rectangular). Нумерация выводов, функции и схемы подключения определены в техническом описании производителя. Обратитесь к нему для точного посадочного места и рекомендаций по пайке.
Нет подробных данных о распиновке для MC145018P.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
MC145018P подходит для 6 применениеs: Residential Ionization Smoke Alarm, Interconnected Commercial Alarm Panel, Piezoelectric Alarm Module, Legacy Alarm-System Retrofit, Portable Ionization Detector, Smoke-Detector Evaluation Board.
Residential Ionization Smoke Alarm
The MC145018P fits a residential ionization smoke alarm because it combines an ionization-chamber interface, smoke-detection control, an interconnect function, and temporal horn drive in one 16-pin PDIP device. The external ionization chamber performs the physical sensing, while the IC monitors the chamber-derived signal and coordinates the audible alarm through a piezoelectric transducer. This arrangement supports a compact through-hole alarm design and reduces the number of separate alarm-driver functions required on the board. The completed unit should follow the manufacturer application circuit and be validated against the applicable UL 217 and UL 268 system requirements.
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Interconnected Commercial Alarm Panel
The MC145018P is suitable for an interconnected commercial alarm panel because its documented interconnect function allows detector units to participate in a shared alarm arrangement. The IC handles ionization-chamber detection and supplies a temporal horn-drive output for each external piezoelectric transducer. Using a dedicated through-hole interface can simplify serviceable alarm modules compared with a mixed surface-mount assembly. Interconnect isolation, maximum network current, alarm polarity, and timing must follow the manufacturer circuit and applicable smoke-alarm system requirements before the board is released for production.
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Piezoelectric Alarm Module
The MC145018P can form the center of a compact piezoelectric alarm module for an ionization-type detector. Its temporal horn driver switches the external piezo element according to the alarm sequence, avoiding the need for a separate general-purpose buzzer driver on the same board. The 16-pin PDIP package also provides a straightforward through-hole construction for alarm modules intended for repair, certification, or retrofit assembly. The transducer’s voltage and current requirements, flyback or damping network, sound chamber, and activation timing should be copied from the manufacturer reference circuit and verified during acoustic testing.
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Legacy Alarm-System Retrofit
The MC145018P is appropriate for a retrofit module that must preserve the electrical and mechanical characteristics of a through-hole ionization detector design. Installing the established 16-pin PDIP footprint can reduce PCB changes when the existing enclosure, ionization chamber, buzzer, and wiring arrangement are retained. The retrofit should be checked against the original device’s pin functions, supply limits, chamber calibration, horn network, and test procedure. Because component revisions and ordering suffixes can carry different qualifications or temperature grades, verify the exact device configuration rather than relying only on the base family number.
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Portable Ionization Detector
The low-power CMOS MC145018P can support a portable ionization detector when the surrounding chamber, supply, and alarm arrangement match its specified operating limits. Its integrated smoke-detection control and temporal horn drive reduce the number of discrete functions required in a compact detector board. A portable product can use the onboard interconnect function for status signaling or integration with a compatible alarm network. Battery life depends on the complete system because chamber current, test routines, indicator behavior, and horn activation materially affect average consumption. Validate those operating conditions in the complete mechanical enclosure rather than estimating from the IC alone.
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Smoke-Detector Evaluation Board
The MC145018P is useful in a smoke-detector evaluation board for validating an ionization chamber, external support network, interconnect wiring, and piezo horn before integrating the circuit into a final alarm enclosure. Its separated sensing, alarm, and temporal horn functions allow each subsystem to be probed with test equipment while retaining the manufacturer’s intended architecture. The evaluation PCB should reproduce the datasheet reference layout closely, including chamber connections, supply bypassing, and horn-drive return routing. Once the chamber response and alarm timing are verified, the same architecture can be transferred into the production detector design.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для MC145018P — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар |
|---|---|
| Package | 16-pin PDIP |
| Brand | NXP Semiconductors |
| Product Type | Ionization smoke detector interface IC |
| Sensor Input | Ionization chamber input |
| Output Type | Voltage output |
| Technology | Low-power CMOS |
| Alarm Function | Temporal horn driver for external piezoelectric transducer |
| Interconnect Function | Supported |
| Pin Count | 16 pins |
| Mounting Type | Through-hole |
Ключевые отличия
- Combines ionization detection, interconnect control, and horn drive (против Generic smoke-detector interface IC)
- Direct external piezoelectric transducer support (против Detector IC requiring a separate horn driver)
- Established through-hole integration format (против MC145018DR2 in an SOIC-16 package)
Заметки по проектированию
Use the manufacturer reference layout as the starting point for the ionization-chamber and horn-drive sections. Keep high-impedance chamber connections short, maintain the prescribed spacing from switched alarm nets, and avoid routing the horn-drive current through sensitive sensor returns. The external piezoelectric transducer and its support network should connect close to the relevant driver pins so that switching energy is not coupled back into the chamber signal path.
Provide stable supply bypassing and verify the power rail against the manufacturer’s operating limits before energizing the detector. The supply must remain valid during smoke detection, interconnect signaling, test pulses, and horn activation. Place the specified bypass capacitor at the device pins and provide a low-impedance ground return for the alarm output. Exact voltage, current, and capacitor values must be taken from the NXP manufacturer datasheet.
Do not substitute a family member or similarly named smoke detector without checking every pin function, the chamber interface, alarm timing, interconnect behavior, and package footprint. The 16-pin PDIP outline does not guarantee functional equivalence, and a surface-mount SOIC-16 version cannot replace the through-hole device without PCB changes. Also confirm the ordering suffix, temperature grade, and lifecycle status before approving a substitute.
The interoperability of a smoke alarm depends on correct chamber polarity, component values, timing, and test-point access, not only on continuity between IC pins. Reproduce the manufacturer’s external-component network, observe the prescribed chamber configuration, and validate alarm activation and interconnect behavior in the finished enclosure. Acoustic and electrical performance should be tested together because enclosure geometry and horn placement can affect the perceived alarm signal.
Информация о соответствии
The manufacturer datasheet states that the MC145018 circuit is designed for smoke-detector systems that comply with UL 217 and UL 268 specifications. This system-design statement is not treated as a device-level RoHS, REACH, lead-free, halogen-free, or AEC-Q100 declaration.