MC14468P - 9V CMOS Ionization Smoke Detector IC | NXP
料号： MC14468P ✗ 停产MC14468P 概述
An ionization smoke detector IC is a specialized sensor-interface and alarm-control device. It belongs to the smoke detector IC category, which sits under sensor and detector interfaces, smoke detection, and broader building safety electronics. Unlike a photoelectric detector, an ionization system uses a radiation-based ionization chamber whose sensing characteristics change when smoke enters the chamber. The MC14468P evaluates that condition and controls the alarm path.
Key features include a 9 V DC operating supply, very low 12 µA supply current, an ionization input interface, voltage output behavior, and direct support for an external piezoelectric sound element. Its 16-pin DIP package supports conventional through-hole assembly, while the tube packaging format supports bulk production handling. The specified operating range is -10°C to +60°C.
The MC14468P is intended to reduce the component count required to implement an ionization smoke alarm. According to the NXP manufacturer datasheet, the device operates with an ionization chamber and a small number of external components, detects smoke, and activates an alarm through an external piezoelectric transducer and internal drivers. Its interconnect capability provides a dedicated route for integrating the detector into a broader alarm or signaling system.
Typical applications include residential smoke alarms, commercial building-alarm panels, interconnected household warning systems, industrial smoke-detection equipment, and retrofit designs that require a through-hole DIP footprint. Product designers should confirm that the selected ionization chamber, resistor, capacitor, buzzer, power supply, and PCB layout satisfy the safety requirements applicable to the finished detector.
The principal design consideration is the detector network around the IC. The verified 8.2 MΩ chamber resistance and 0.1 nF capacitor values are application references rather than universal substitutions, so engineers should use the manufacturer datasheet and applicable UL requirements when calculating network values, timing, sensitivity, and fault conditions.
This product record combines verified NXP and distributor information with an honest comparison of available drop-in data. It also identifies where pricing, detailed pin functions, and verified lifecycle-specific electrical limits remain unavailable, preventing unsupported replacement claims or unverified PCB-reuse assumptions.
直接替换替代料： MC14468P ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
MC14468
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC14468P 最大额定值与电气特性
| Product Type | Ionization smoke detector IC with interconnect |
| 电源电压 | 9 V DC |
| 电源电流 | 12 µA |
| 工作温度 | -10°C to +60°C |
| Ionization Chamber Resistance | 8.2 MΩ |
| External Capacitor | 0.1 nF |
| Input Type | Ionization input |
| 输出类型 | Voltage output |
| Alarm Output | External piezoelectric transducer |
| Technology | Low-power CMOS |
| Interconnect | Supported |
| 封装 | 16-DIP (0.300 inch, 7.62 mm) |
| 安装类型 | Through-hole |
| Packaging | Tube |
| Compliance References | UL 217 and UL 268 system requirements |
MC14468P 16-dip (0.300 inch, 7.62 mm) 引脚配置指南
MC14468P（16-dip (0.300 inch, 7.62 mm) 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： MC14468P.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MC14468P 适用于 6 应用s: Residential Ionization Smoke Alarm, Interconnected Household Alarm Network, Commercial Building Alarm Panel, Industrial Smoke Detection Equipment, Legacy Smoke Alarm Retrofit, Battery-Backed Safety Sensor.
Residential Ionization Smoke Alarm
The MC14468P fits a residential ionization smoke alarm because it combines a 9 V DC supply, 12 µA supply current, and an ionization-sensor interface with external piezoelectric alarm support. The IC can operate with an ionization chamber and a small number of external components, allowing a conventional alarm architecture to use a 16-pin DIP footprint. The verified chamber references of 8.2 MΩ and 0.1 nF provide a starting point for the sensing network, but final sensitivity and timing must match the applicable safety requirements. Designers should also budget for the higher load imposed by the external transducer and verify that the complete alarm remains compliant with the required smoke-alarm standards.
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Interconnected Household Alarm Network
The MC14468P is appropriate for an interconnected household warning network because the manufacturer datasheet explicitly identifies the IC as a smoke detector with interconnect. Each detector can evaluate an ionization chamber and drive a local external piezoelectric transducer while participating in a broader alarm arrangement. Its 12 µA specified supply current is valuable when standby power consumption affects battery-life calculations. The engineer must still validate the interconnect voltage levels, line topology, fault behavior, and timing in the system design because those detailed interface conditions are not included in the supplied search excerpts.
推荐
Commercial Building Alarm Panel
A commercial building alarm panel can use the MC14468P where a legacy design requires ionization sensing rather than photoelectric detection and retains a through-hole DIP assembly. The 16-pin package supports conventional PCB routing, while the 9 V operating supply and 12 µA specified current suit established low-power detector circuits. Because the MC14468P is identified as obsolete, equipment maintenance may benefit more than new panel construction. Before integrating it into a commercial system, confirm the detector network, alarm-level requirements, diagnostic behavior, environmental limits, and any certification obligations of the completed alarm equipment.
推荐
Industrial Smoke Detection Equipment
The MC14468P can support specialized industrial smoke-detection equipment when the original design depends on an ionization chamber and the operating environment remains within -10°C to +60°C. Its low-power CMOS operation, specified 12 µA supply current, and external piezoelement drive capability make it suitable for continuously monitored detection nodes. The sensing network still requires careful validation because industrial hazards can alter smoke characteristics, airflow, humidity, and chamber behavior. Use the official datasheet for timing and electrical limits, and treat the 8.2 MΩ and 0.1 nF values as verified reference-network data rather than universal design constants.
推荐
Legacy Smoke Alarm Retrofit
The MC14468P is especially relevant to a retrofit that must preserve an existing 16-DIP ionization-smoke-detector PCB and its surrounding analog network. Its through-hole package avoids the need to redesign for a surface-mount footprint, and the low 12 µA specified supply current supports continued operation from constrained alarm supplies. A successful retrofit depends on exact pin compatibility, correct chamber and capacitor values, buzzer drive requirements, and an available traceable part. The obsolete lifecycle status means engineers should not assume future replenishment and should evaluate an internally qualified alternative before using the MC14468P in a new production run.
推荐
Battery-Backed Safety Sensor
The MC14468P can serve as the sensing element of a battery-backed smoke-safety device because its verified supply current is 12 µA during the specified operating condition. This low CMOS current helps preserve standby capacity, although the complete power budget must add the external piezoelectric transducer, chamber network, indicator electronics, and any interconnect circuitry. The device operates from 9 V DC and supports an external piezoelement, matching many legacy alarm architectures. Before release, engineers should test low-battery behavior, alarm-current duration, temperature performance across -10°C to +60°C, and all failure modes required by the finished product standard.
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工程参考数据： MC14468P ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MC14468 |
|---|---|---|
| Package | 16-DIP (0.300 inch, 7.62 mm) | 16-DIP (0.300 inch, 7.62 mm) |
| Brand | NXP Semiconductors | NXP Semiconductors |
| Product Type | Ionization smoke detector IC with interconnect | Ionization smoke detector IC with interconnect |
| Supply Voltage | 9 V DC | 9 V DC |
| Supply Current | 12 µA | 12 µA |
| Operating Temperature | -10°C to +60°C | -10°C to +60°C |
| Ionization Chamber Resistance | 8.2 MΩ | 8.2 MΩ |
| External Capacitor | 0.1 nF | 0.1 nF |
| Alarm Output | External piezoelectric transducer | External piezoelectric transducer |
| Interconnect | Supported | Supported |
| Technology | Low-power CMOS | Low-power CMOS |
关键差异点
- Provides an established ionization smoke detector architecture rather than a general-purpose alarm controller （对比 MC14468)
- Integrates interconnect capability with local piezoelement alarm drive （对比 MC14468)
- Maintains a low-power supply requirement for standby smoke detection （对比 MC14468)
设计说明
Design the 9 V DC supply and return path for both the detector IC and the external piezoelectric transducer. The verified 12 µA figure describes the MC14468P supply current, not total alarm-system demand. Confirm transducer operating current, startup behavior, interconnect load, and battery or supply capacity so that the actuator is not browned out when the alarm activates.
Preserve the 16-DIP through-hole footprint and the sensing-network layout of the original design where possible. Keep the chamber-connected traces compact and isolate them from buzzer-drive and interconnect paths to reduce noise coupling into the ionization input. Because the supplied search excerpts do not contain the full recommended PCB layout, use the official NXP datasheet and the finished detector's validation requirements as the layout authority.
Do not treat MC14468 and MC14468P as automatically interchangeable without checking the exact package suffix, temperature grade, and pin functions. The verified application references of 8.2 MΩ and 0.1 nF must also be checked against the selected chamber and alarm timing. For any new safety product, include the chamber, buzzer, power source, enclosure, fault conditions, and applicable certification in the qualification process.
Keep the detector operating inside the verified -10°C to +60°C range and account for temperature changes in the external chamber and capacitor rather than relying only on the IC rating. Through-hole thermal performance is normally dominated by the board, nearby components, and enclosure during a sound-alarm event. Verify the chamber response and piezoelectric performance at temperature extremes because changes in the external network can affect detection sensitivity even when the IC itself remains within its rated range.
合规信息
The NXP manufacturer datasheet states that the circuit is designed for smoke detector systems that comply with UL 217 and UL 268 specifications. This describes intended system compatibility and does not by itself establish RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for the MC14468P. Those fields remain unknown because the supplied records do not provide the corresponding declarations.
