MC145017P - Low-Power Ionization Smoke Detector IC | NXP
MPN: MC145017P ✗ Cuối đờiMC145017P Tóm tắt
An ionization smoke detector is a safety appliance that uses a radiation-based sensing chamber to identify airborne smoke particles. The MC145017 belongs to the sensor and detector interface hierarchy: it accepts an analog signal from the ionization chamber, applies internal detection logic, and controls a piezoelectric alarm. This architecture allows the sensitive ionization chamber, resistive components, and acoustic transducer to remain separate from the monolithic CMOS control circuit.
The principal features of the MC145017P include very low 12 µA supply current, CMOS construction, an ionization-sensor input, a voltage output, and a temporal-pattern horn driver for an external piezoelectric transducer. Low supply current is important in battery-operated alarm systems because the detector electronics and sensing chamber must maintain useful standby and alarm performance without imposing excessive load on the backup battery.
The MC145017 is designed to operate with an ionization chamber and a small number of external components. According to the NXP MC145017 datasheet, the associated circuit is intended for smoke-detector systems designed to comply with UL217 and UL268 specifications. The temporal horn pattern provides an intermittent alarm signal, while the low-power CMOS control section supports battery-powered installations where standby current is a primary design constraint.
Typical applications include residential ionization smoke alarms, commercial smoke-detector modules, and legacy alarm-system replacements that retain the MC145017P pinout. Because the part is listed as obsolete, engineers should treat it primarily as a maintenance component for equipment already built around this device. New smoke-alarm designs should also evaluate current-generation detector ICs against applicable safety requirements rather than assuming an obsolete part can be introduced into a newly certified product.
Circuit design requires careful treatment of the ionization-chamber interface, alarm-driver output, supply decoupling, and test points. Keep sensitive input routing away from the piezoelectric drive path, provide the external components specified by the manufacturer, and verify startup, smoke-entry, alarm-sound, and battery-fallback behavior in the complete detector assembly. The 16-pin PDIP package also requires adequate hole spacing and through-hole assembly clearance on the PCB.
This page consolidates the MC145017P electrical characteristics, package information, application context, and selection considerations into an engineering-focused guide. It also documents the absence of a verified pin-compatible substitute set and highlights the product's obsolete lifecycle status, helping engineers distinguish usable legacy replacements from components that merely perform a similar smoke-detection function.
Bộ thay thế dễ dàng lắp đặt cho MC145017P — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Không có bộ thay thế dễ dàng lắp đặt sẵn có cho sản phẩm này.
Yêu cầu các bộ thay thếMC145017P Thông số kỹ thuật
| Product Type | Low-power CMOS ionization smoke detector IC with temporal-pattern horn driver |
| Sensor Input Type | Ionization |
| Kiểu đầu ra | Voltage |
| Điện áp cung cấp | 12 µA |
| Nhiệt độ hoạt động | -10°C to 60°C |
| Hộp | 16-DIP (0.300 inch, 7.62 mm pitch) |
| Terminal Count | 16 terminals |
| Kiểu lắp đặt | Through-hole |
| Packaging | Tube |
| Process Technology | CMOS |
| Power Classification | Low-power device |
| Alarm Output | External piezoelectric transducer driven by internal horn drivers |
| Alarm Pattern | Temporal pattern |
| Required Sensor | External ionization chamber |
| Designed Smoke-System Compatibility | UL217 and UL268 specifications |
Hướng dẫn cấu hình chân MC145017P 16-dip (0.300 inch, 7.62 mm pitch)
Cấu hình chân cho MC145017P (16-dip (0.300 inch, 7.62 mm pitch) gói). Số thứ tự chân, chức năng và sơ đồ kết nối được xác định trong tài liệu thông số kỹ thuật của nhà sản xuất. Tham khảo nó để biết footprint và hướng dẫn hàn chính xác.
Không có dữ liệu chân cụ thể sẵn có cho MC145017P.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
MC145017P phù hợp cho 6 Áp dụngs: Residential Ionization Smoke Alarm, Commercial Smoke Detector Module, Legacy Alarm-System Maintenance, Battery-Powered Fire-Safety Sensor, Remote Residential Alarm Sensor, Industrial Enclosure Smoke Sensor.
Residential Ionization Smoke Alarm
The MC145017P fits a legacy residential ionization smoke alarm because it combines an ionization-chamber interface, low-power CMOS control logic, and a temporal horn driver in one 16-DIP device. Its 12 µA supply current helps preserve battery life during standby, while the internal alarm drivers energize an external piezoelectric transducer when smoke is detected. Installation in a certified product requires the prescribed chamber, resistor network, test arrangement, and sound-output hardware. Because the MC145017P is obsolete, this application is most appropriate for repairing an existing alarm that already uses its exact pinout rather than launching a newly certified consumer product.
Được đề xuất
Commercial Smoke Detector Module
The MC145017P can serve as the central detector in a legacy commercial alarm module that uses an ionization chamber and a piezoelectric horn. The 16-pin PDIP construction simplifies through-hole assembly and repair in equipment designed around the original footprint. Its 12 µA supply current supports low standby demand, while the temporal alarm pattern supplies the required intermittent horn signal. The external chamber and acoustic hardware must be arranged to meet the intended UL217 or UL268 system specification. Since the part is obsolete, current commercial designs should verify regulatory and lifecycle requirements before adopting this architecture.
Được đề xuất
Legacy Alarm-System Maintenance
The MC145017P is most practical as a maintenance component for installed smoke-alarm equipment that already uses its 16-DIP footprint, chamber interface, and temporal horn-driver configuration. A failed IC can be restored without redesigning the enclosure, PCB, or piezoelectric transducer arrangement when a genuine replacement and exact pinout are confirmed. Its low 12 µA supply current is useful when assessing battery endurance in the restored unit. Before installation, verify device markings, pin orientation, supply behavior, chamber calibration, alarm-sound output, and system test results; component interchange without those checks can compromise the safety function.
Được đề xuất
Battery-Powered Fire-Safety Sensor
The MC145017P is suited to battery-powered ionization fire-sensing equipment where standby consumption is important. Its specified 12 µA supply current helps minimize continuous demand from the control electronics, allowing more capacity to remain available for sensing, self-test, and alarm operation. The device accepts the external ionization-chamber signal and controls an external piezoelectric transducer with a temporal pattern. Designers must still account for the chamber current, quiescent paths, battery leakage, and horn-driver load when calculating service life. For new safety products, a supported detector IC with verified certification is generally preferable to this obsolete component.
Được đề xuất
Remote Residential Alarm Sensor
The MC145017P can support a remote residential alarm sensor that uses an ionization chamber to detect smoke and a piezoelectric element for local sound. The device's low-power CMOS operation and 12 µA supply-current rating are useful when the sensor must operate for long periods from a limited energy source. Its temporal horn-driver function separates acoustic actuation from the chamber-sensing function, while the DIP package permits straightforward replacement in through-hole legacy hardware. The complete sensor must still be tested for chamber response, false-alarm behavior, test-button operation, sound output, and backup-power capability before deployment.
Được đề xuất
Industrial Enclosure Smoke Sensor
The MC145017P may be used in a legacy industrial enclosure smoke sensor that requires ionization sensing and a local piezoelectric alarm. The 16-DIP package and external-component architecture allow the chamber and transducer to be placed according to airflow, insulation, and acoustic requirements while the control IC remains on a through-hole PCB. The 12 µA supply current supports low standby demand, but the -10°C to 60°C operating range must be checked against enclosure temperatures. Validate chamber geometry, contamination tolerance, alarm pattern, and applicable industrial safety requirements. For new installations, confirm the obsolete part's availability and consider a currently supported detector platform.
Được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC145017P — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này |
|---|---|
| Manufacturer | NXP Semiconductors |
| Package | 16-DIP (0.300 inch, 7.62 mm pitch) |
| Mounting Style | Through-hole |
| Product Function | Ionization smoke detector IC with temporal-pattern horn driver |
| Sensor Input | Ionization |
| Output Type | Voltage |
| Supply Current | 12 µA |
| Operating Temperature | -10°C to 60°C |
| Process Technology | CMOS |
| Lifecycle Status | Obsolete |
Bảo phân biệt quan trọng
- Integrated ionization sensing and temporal alarm control (vsMC14538BDTR2G)
- Low standby supply current (vsGeneric legacy smoke-detector interface)
- Established legacy package and system orientation (vsMC14536BCP)
Ghi chú thiết kế
Route the ionization-chamber signal with short traces, a guarded area, and minimal loop area to reduce susceptibility to EMI and leakage. Keep these sensitive nodes away from the piezoelectric horn-driver traces and switching or power-conversion paths. Use a stable reference ground for the chamber network and follow the grounding arrangement in the manufacturer application schematic. After layout, verify both normal chamber operation and immunity to nearby alarm-drive and supply transients.
Estimate battery endurance from the complete alarm circuit rather than the MC145017P supply current alone. The IC contributes 12 µA, while the chamber, bias network, leakage paths, test circuitry, and piezoelectric transducer can change the system load. Start with Pstandby = VIN × Istandby and divide usable battery energy by measured standby and alarm power. Include battery self-discharge, temperature capacity loss, and end-of-life voltage when establishing the service interval.
Do not substitute the MC145017P with a generic timer, oscillator, or smoke-detector IC merely because its alarm function appears similar. A valid repair part must preserve the 16-DIP pinout, ionization-chamber interface, supply limits, 12 µA-class operating behavior, test circuitry, and temporal piezoelectric drive. Verify device orientation and markings before energizing the board, then perform chamber, self-test, alarm-sound, and power-failure checks on the assembled detector.
The IC package is not the primary thermal concern in a low-power smoke detector, but the piezoelectric transducer and power source may impose separate limits. Check the manufacturer's horn-driver output characteristics before adding series resistance or changing the transducer. If the operating environment exceeds the MC145017P range of -10°C to 60°C, relocate or protect the assembly rather than assuming the through-hole package provides environmental tolerance.
Thông tin tuân thủ
The NXP MC145017 datasheet states that the circuit is designed for smoke-detector systems that comply with UL217 and UL268 specifications. This system-design reference does not establish the MC145017P's own RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification status.
