LM239J - 4-Comparator 1.3us CDIP-14 | Texas Instruments
MPN： LM239J ✓ 啟用中LM239J 概覽
A voltage comparator is an analog signal-processing IC that compares an inverting input with a non-inverting input and changes its output state when the input relationship crosses a selected threshold. The LM239 belongs to the comparator hierarchy and provides four independent channels in one IC, reducing package count when a system needs multiple limit detectors, sorting decisions, or simple control decisions. Its open-collector outputs support wired-AND behavior when suitable pull-up circuitry is provided.
Key verified features include four comparators, a response time of 1.3 microseconds, a 2 mV maximum offset-voltage claim in one indexed datasheet listing, and compatibility with CMOS, DTL, ECL, MOS, and TTL output logic according to the verified search results. Another result lists 300 ns response time and 800 microamp supply current for the related comparator family, but these values were not treated as LM239J specifications because the source context is incomplete.
The LM239J can operate from single or split supplies, depending on the application and datasheet limits. Because the outputs are open collector, an external pull-up resistor is normally required to establish a valid high output level. The four channels can compare sensor outputs against reference voltages, supervise rails, detect overvoltage or undervoltage conditions, or implement simple oscillator and control functions.
Typical designs should account for input common-mode range, output pull-up selection, input filtering, and propagation-delay requirements. In a precision threshold circuit, resistor tolerances and input offset voltage directly affect the switching point. In an industrial control design, lead capacitance and pull-up resistance can affect rise time, while supply bypassing helps reduce noise and unstable switching behavior.
This page combines verified manufacturer and distributor information with packaging, application, comparison, and design guidance. It distinguishes confirmed LM239J facts from parameters that were not available in the supplied sources, avoiding unsupported electrical claims or invented pricing.
直接替換替代品，適用於 LM239J — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LM239J （相同外形與佔位） — 差異在於 Package, Comparator Type, Response Time, Number of Comparators, Operating Temperature.
LM339N
✅ 直接替換聯絡詢價
查看資料表 →LM339M
✅ 直接替換聯絡詢價
查看資料表 →LM339D
✅ 直接替換聯絡詢價
查看資料表 →LM239J 最大額定值與電氣特性
| Comparator Type | General-purpose voltage comparator |
| Number of Comparators | 4 |
| Response Time | 1.3 microseconds |
| Supply Voltage Range | -18 V to +18 V |
| 輸出類型 | Open-collector |
| Output Compatibility | CMOS, DTL, ECL, MOS, TTL |
| Offset Voltage | 2 mV maximum |
| 工作溫度 | -25 C to +85 C |
| 封裝 | CDIP-14 |
| 腳位數 | 14 pins |
| 安裝類型 | Through-hole |
| Logic Output | Open collector |
| RoHS | Compliant |
LM239J cdip-14 腳位配置指南
LM239J（cdip-14 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： LM239J.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM239J 適用於 6 應用s: Industrial Sensor Threshold Detection, Overvoltage and Undervoltage Supervisors, Battery Monitoring Systems, Motor and Solenoid Control Logic, Audio and Communication Signal Conditioning, Automated Test and Measurement Control.
Industrial Sensor Threshold Detection
The LM239J fits industrial sensor threshold detection because it provides four independent general-purpose comparator channels with a verified 1.3 microsecond response time. Each channel can compare a conditioned sensor voltage against a reference and produce an open-collector decision. Use the open-collector output with a pull-up resistor so the result can drive a digital input, relay-control stage, or alarm input. The verified 2 mV maximum offset claim is relevant when the switching threshold must be repeatable, although resistor tolerances and temperature drift still need to be included in the error budget.
推薦
Overvoltage and Undervoltage Supervisors
The LM239J can supervise multiple rails or signal nodes because four comparator sections are integrated into one CDIP-14 package. Compare each monitored voltage with a resistor-defined reference, then use separate open-collector outputs with pull-ups to report fault states. The 1.3 microsecond response time is suitable for ordinary power-supply supervision rather than ultra-fast protection loops. Designers should verify input common-mode limits, supply voltage, and output timing from the full TI datasheet before using the comparator as a sole protection element.
推薦
Battery Monitoring Systems
The four-channel architecture of the LM239J is useful in battery monitoring systems where several voltage thresholds must be evaluated. Each comparator can compare a divided battery voltage against a reference, and the open-collector outputs can be pulled up to a common logic rail for a microcontroller or fault controller. The verified -25 C to +85 C operating range is relevant to many industrial battery systems, but the final design must check the actual battery voltage against the LM239J supply and input limits.
推薦
Motor and Solenoid Control Logic
LM239J can provide decision logic for motor and solenoid control systems by comparing command, feedback, or current-sense signals against adjustable thresholds. The 1.3 microsecond response time is suitable for ordinary control and interlock functions, while open-collector outputs can drive an external transistor or relay-driver stage. Because the outputs are open collector, the designer must add pull-up components and ensure that the downstream transistor, relay coil, or logic input has appropriate voltage and current ratings.
推薦
Audio and Communication Signal Conditioning
The LM239J is appropriate for basic audio and communication signal-threshold functions when the design needs a clean binary decision rather than linear amplification. A comparator channel can detect whether a conditioned signal has crossed a selected reference, with the result pulled up to a compatible logic rail. The verified 1.3 microsecond response time is more than adequate for many low-frequency audio and control paths. For precision audio behavior, evaluate offset, noise, input filtering, and the surrounding analog network rather than relying only on nominal response time.
推薦
Automated Test and Measurement Control
The quad-channel LM239J can support automated test equipment by making several limit decisions around a device under test. For example, four comparators can monitor test-node voltages and generate pass/fail signals for a fixture controller. Open-collector outputs are useful when several channels need a common pull-up or wired-AND arrangement. The 1.3 microsecond response time supports ordinary fixture timing, but high-speed production testers should verify propagation delay, input capacitance, output rise time, and system-level timing margins.
推薦
推薦產品摘要
工程參考資料，適用於 LM239J — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LM339N | LM339M | LM339D | LM393P | LM393N |
|---|---|---|---|---|---|---|
| Package | CDIP-14 | PDIP-14 | SOIC-14 | SOIC-14 | PDIP-8 | PDIP-8 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Comparator Count | 4 | 4 | 4 | 4 | 2 | 2 |
主要差異化特點
- Four integrated comparator channels (對比LM393P)
- LM239J is specified as a general-purpose comparator (對比LM339N)
- Verified response time (對比LM393P)
- Open-collector interface flexibility (對比LM339N)
設計說明
Route each comparator input as a short, low-impedance analog trace and place any input filtering capacitors close to the relevant device pin. Keep the reference divider and protected sensor node away from switching-power paths where possible. Because the LM239J uses open-collector outputs, route pull-up resistors near the receiving logic or the comparator package according to the required rise time, and confirm that trace capacitance does not degrade switching behavior.
Add local supply bypassing close to the LM239J and verify the actual supply voltage against the verified -18 V to +18 V range before powering the board. Open-collector outputs require an external pull-up rail, and the pull-up current must remain within the device’s verified sink capability. Also confirm that the pull-up voltage is compatible with the downstream CMOS, TTL, MOS, DTL, or ECL interface rather than assuming every logic family uses the same threshold.
Do not treat the 2 mV maximum offset claim as zero error in a precision threshold design. Include resistor tolerance, input offset, temperature effects, and any propagation-delay uncertainty when defining a safe switching band. Also avoid using the search result that mentions 300 ns as an LM239J specification unless the exact manufacturer datasheet confirms it; the verified LM239J-specific result identifies 1.3 microseconds.
Open-collector outputs transition from a low state to the pull-up voltage with an RC-dependent rising edge. Calculate the pull-up resistance against the input capacitance, required rise time, output sink current, and power dissipation before finalizing the interface. When combining outputs, include the sum of leakage currents and check that the resulting wired-AND node still meets the receiver’s valid-low and valid-high limits.
合規資訊
RoHS compliance is reported in the verified LM239J/NOPB specification. The supplied data does not provide REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification information for the exact LM239J ordering code.
