LM339N - Quad Open-Collector Comparator | Texas Instruments
MPN： LM339N ✓ 啟用中LM339N 概覽
A quad comparator is an analog comparator integrated circuit used to determine whether an input voltage is higher or lower than a reference voltage. The comparator function belongs to the broader analog and mixed-signal semiconductor hierarchy: comparator -> differential comparator -> analog IC -> semiconductor. LM339N provides four channels in one package, reducing component count when a system needs several independent threshold, sorting, overvoltage, or sensing decisions.
The main verified characteristics are four independent comparator sections, open-collector outputs, a 14-pin PDIP package, and a wide operating supply range of 2 V to 36 V. The manufacturer describes the LM339-N family as a low-power, low-offset voltage quad comparator. Because the outputs are open collector, the output stage can sink current but does not actively drive a high voltage; an external resistor connects the output node to the desired positive supply. This arrangement supports wired logic, relay or lamp drive, and level translation when the pull-up voltage is selected appropriately.
The open-collector architecture also provides a useful benefit in multi-comparator systems: several outputs can be connected to a common pull-up node when the application intentionally requires wired-AND behavior. The design must account for the voltage and current limits of every connected output and for the sink-current capability of each comparator. The external pull-up resistor also affects rise time, so a lower resistance can improve speed while increasing current and power dissipation.
Typical uses include DC threshold detection, battery and supply monitoring, window comparison, industrial control logic, sensor conditioning, overvoltage indication, and general-purpose analog decision circuits. The four channels can be used for independent comparisons or arranged as a multi-level voltage detector. Because input and output details beyond the verified source were not supplied, exact input common-mode limits, output sink-current limits, input offset, response-time conditions, and temperature ranges should be confirmed in the manufacturer datasheet before production release.
The LM339N is primarily a through-hole general-purpose comparator rather than a high-speed logic device. Its strength is simple wide-supply operation with four channels and open-collector outputs. A PCB design should route comparator inputs away from switching nodes, provide a stable reference, use a defined ground return, and choose pull-up resistors according to the required logic voltage, rise time, and current budget. This page combines verified distributor and manufacturer information with application-oriented design guidance while avoiding unsupported numeric claims.
直接替換替代品，適用於 LM339N — 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： LM339N （相同外形與佔位） — 差異在於 Comparator Type, Package, Logic Compatibility, Response Time, Input Bias Current.
LM339NG
✅ 直接替換聯絡詢價
查看資料表 →LM339AN
✅ 直接替換聯絡詢價
查看資料表 →LM2901
✅ 直接替換📋 參考替代品（不在目錄中）
LM3302
✅ 直接替換📋 參考替代品（不在目錄中）
KA339
✅ 直接替換📋 參考替代品（不在目錄中）
CA139
✅ 直接替換📋 參考替代品（不在目錄中）
LM339N 最大額定值與電氣特性
| Comparator Type | Quad differential comparator |
| Number of Channels | 4 |
| Supply Voltage Range | 2 V to 36 V |
| Differential Input Voltage Range | +/- 1 V to +/- 18 V |
| Response Time | 1.3 microseconds |
| 輸出類型 | Open-collector |
| 封裝 | 14-pin PDIP |
| 安裝類型 | Through-hole |
| Comparator Configuration | Four independent comparators |
| External Pull-Up Resistor | Required for open-collector output |
| Manufacturer Classification | Low Power Low Offset Voltage Quad Comparator |
| Datasheet Availability | Manufacturer product page and datasheet referenced |
LM339N 14-pin pdip 腳位配置指南
LM339N（14-pin pdip 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： LM339N.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM339N 適用於 6 應用s: Industrial Threshold Detection, Battery Voltage Monitoring, Overvoltage and Undervoltage Protection, Sensor Signal Conditioning, Power Supply Sequencing and Fault Logic, Wired-Logic and Alarm Systems.
Industrial Threshold Detection
The LM339N fits industrial threshold detection because its four differential comparator channels can independently compare a sensed voltage against a reference. The verified operating range of 2 V to 36 V supports a wide variety of supply environments, while the approximately 1.3 microsecond response provides useful speed for many control and monitoring functions. Use each channel with carefully selected input resistors and an open-collector pull-up to a logic rail. Because the output is open collector, the pull-up voltage can match the controller’s input domain, although sink-current and input common-mode limits must be verified from the exact manufacturer datasheet.
推薦
Battery Voltage Monitoring
LM339N can provide multiple battery-related threshold decisions when its four comparator channels are assigned to different voltage levels or event conditions. The wide 2 V to 36 V supply range and differential-input capability make it suitable for monitoring circuits where a sensed battery voltage must be compared with references. Place input filtering near the pins, establish a low-impedance reference, and use the open-collector outputs to drive status indicators or downstream digital inputs through pull-up resistors. The main design trade-off is that external pull-up resistance sets the output rise time, so the chosen value must balance response against current consumption.
推薦
Overvoltage and Undervoltage Protection
The four independent channels in LM339N can implement a multi-level protection or window-detection system by comparing a protected voltage with upper and lower references. Its differential comparator structure allows the design to make decisions directly from two input nodes, and its open-collector outputs can be wired to an alarm or shutdown input through a suitable pull-up. The 2 V to 36 V supply specification is useful for industrial rails, but the exact input common-mode window and output sink-current rating must be checked before deployment. Add hysteresis around each threshold to prevent repeated switching when the measured voltage contains noise or varies near the decision point.
推薦
Sensor Signal Conditioning
LM339N is useful for conditioning slow or moderate-speed sensor signals that must be converted into a binary decision. For example, a temperature, light, or position sensor can be compared against a calibrated threshold using one or more comparator channels. The approximately 1.3 microsecond listed response is sufficient for many industrial control loops, while four channels allow multiple alarm points without requiring four separate packages. Keep sensor traces away from switching nodes, provide a stable reference, and use the open-collector stage with a pull-up appropriate for the receiving logic. Verify input bias, offset, and common-mode specifications before using the comparator for high-accuracy sensing.
推薦
Power Supply Sequencing and Fault Logic
LM339N can supervise multiple power rails by comparing each rail against a reference and producing an open-collector fault or ready signal. The four-channel architecture is convenient for compact control boards because it combines several comparisons in one 14-pin PDIP package. The open-collector outputs can be pulled up to the voltage expected by a supervisor, microcontroller, or gate-control circuit, while the wide supply range supports industrial and bench environments. Ensure the pull-up voltage does not exceed the output and supply limits, and add decoupling close to the comparator. The supplied data does not establish all rail-to-rail input limits, so consult the exact datasheet before sequencing high-voltage systems.
推薦
Wired-Logic and Alarm Systems
The open-collector outputs of LM339N make the device suitable for simple wired logic, alarm aggregation, and fault signaling where multiple channels should share a common pull-up node. If several outputs are intentionally connected together, the wired-AND behavior can represent one combined fault indication, provided the sink-current and voltage limits are respected. This is a practical alternative to adding a separate logic gate, but it requires careful analysis of the maximum number of simultaneously active outputs. Use a pull-up resistor that satisfies the receiver’s input-current budget and add filtering or hysteresis where switch bounce or sensor noise could otherwise cause repeated alarm transitions.
推薦
推薦產品摘要
工程參考資料，適用於 LM339N — 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 | LM339NG | LM339AN | LM2901 | LM3302 | KA339 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | onsemi | Texas Instruments | Texas Instruments | Texas Instruments | onsemi |
| Comparator Type | Quad differential comparator | Quad general-purpose comparator | LM339-family comparator | Comparator replacement candidate | Comparator replacement candidate | Quad comparator candidate |
主要差異化特點
- Four-channel integration (對比LM2901)
- Wide single-supply range (對比LM3302)
- Open-collector output flexibility (對比LM339AN)
- Direct substitute evidence (對比LM339NG)
設計說明
Because the LM339N uses open-collector outputs, design the output power path around the external pull-up resistor and the required logic voltage. Choose the resistor to provide a valid high level without exceeding the comparator’s sink-current rating, while allowing adequate rise time for the receiving circuit. The verified data confirms open-collector operation but does not provide the sink-current limit, so confirm that value in the exact manufacturer datasheet before finalizing the resistor value.
Place the comparator inputs, reference components, and any input filtering close to the LM339N pins. Keep the reference node away from high-current switching paths and connect the bypass capacitor directly to the device supply and ground pins. Since the part is a 14-pin PDIP, route sensitive input traces away from adjacent digital or power nets wherever possible. A short, low-loop-area ground path helps reduce noise pickup and unpredictable threshold transitions.
Do not assume that an open-collector output is actively driven high. Without a pull-up resistor, the output node floats when the comparator is off. Also do not treat a family-name cross-reference as proof of interchangeability: compare supply voltage, input common-mode range, differential input limits, offset, response conditions, output topology, package pinout, and temperature grade. The supplied data explicitly identifies LM339NG as pin-compatible, while several other candidates still require datasheet confirmation.
合規資訊
Compliance information is not included in the verified web data or internal database data for LM339N. Do not infer RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status from the generic LM339 family name.