LM339ANG4 - 4-Channel 30V Differential Comparator | Texas Instruments
MPN： LM339ANG4 ✓ 啟用中LM339ANG4 概覽
A comparator is an analog integrated circuit that converts the relationship between two voltages into a digital output state. The LM339 belongs to the comparator IC family, within the broader hierarchy of analog semiconductor and signal-conditioning devices. Unlike a general-purpose operational amplifier used primarily for closed-loop amplification, a comparator is optimized to determine whether one input is above or below another, commonly for sensing and switching applications.
The four-channel architecture reduces the number of packages and PCB connections needed for multi-threshold systems. Key characteristics include a maximum input offset voltage of 3 mV at 30 V, maximum input bias current of 0.25 µA at 5 V, and typical output current capability of 20 mA. The open-collector outputs can sink current for driving pull-up networks and interfacing with TTL, MOS, and CMOS-compatible logic, although an external pull-up resistor is required.
The device accepts a wide single-supply operating range of 2 V to 30 V and a dual-supply range of ±1 V to ±15 V. This voltage tolerance makes it useful in industrial, automotive-adjacent, instrumentation, and embedded systems where sensing nodes may exceed ordinary low-voltage logic rails. The A-version LM339ANG4 is identified in the manufacturer documentation as an active quad differential comparator in a 14-DIP package measuring 0.300 inch, or 7.62 mm, across the lead row.
Typical applications include DC overvoltage and undervoltage detection, sensor threshold switching, window comparators, relay-control interfaces, battery monitoring, and four-channel process-signal conditioning. Because the outputs use open-collector transistors, pull-up resistors can be selected to match the voltage and current requirements of the following logic family. The shared supply architecture also simplifies dual-polarity sensing around ground.
Designers should verify input common-mode limits, output pull-up values, and channel-to-channel behavior before implementation. Input protection, filtering, and hysteresis may be required when sensed signals contain noise or when the comparator output must remain stable around a switching threshold. The 14-pin DIP through-hole package also provides ample spacing for hand assembly, prototyping, and serviceable industrial electronics.
This product page combines the manufacturer device information with practical application guidance, package-level design considerations, and a structured comparison of compatible quad comparator options for easier component selection and PCB planning.
直接替換替代品，適用於 LM339ANG4 — 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： LM339ANG4 （相同外形與佔位） — 差異在於 Comparator Type, Package, Logic Compatibility, Mounting Type, Output Type.
LM339AN
✅ 直接替換聯絡詢價
查看資料表 →LM339N
✅ 直接替換聯絡詢價
查看資料表 →LM239AN
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →LM2901AN
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM339ANG4 最大額定值與電氣特性
| Comparator Type | General-purpose differential comparator |
| Number of Channels | 4 channels |
| 輸出類型 | Open-collector |
| Single-Supply Voltage Range | 2 V to 30 V |
| Dual-Supply Voltage Range | -15 V to +15 V |
| Maximum Input Offset Voltage | 3 mV at 30 V |
| Maximum Input Bias Current | 0.25 µA at 5 V |
| Typical Output Current | 20 mA |
| Maximum Common-Mode Input Voltage | 38 V |
| Maximum Differential Input Voltage | 38 V |
| 封裝 | 14-DIP, 0.300 inch (7.62 mm) lead spacing |
| 安裝類型 | Through-hole |
| Logic Compatibility | TTL, MOS, and CMOS compatible |
| Human Body Model ESD Rating | 2 kV |
LM339ANG4 腳位配置
| 腳位 1 | OUT 1 — Open-collector output for comparator channel 1 |
| 腳位 2 | IN− 1 — Inverting input for comparator channel 1 |
| 腳位 3 | IN+ 1 — Non-inverting input for comparator channel 1 |
| 腳位 4 | GND — Ground connection |
| 腳位 5 | IN+ 2 — Non-inverting input for comparator channel 2 |
| 腳位 6 | IN− 2 — Inverting input for comparator channel 2 |
| 腳位 7 | OUT 2 — Open-collector output for comparator channel 2 |
| 腳位 8 | OUT 3 — Open-collector output for comparator channel 3 |
| 腳位 9 | IN− 3 — Inverting input for comparator channel 3 |
| 腳位 10 | IN+ 3 — Non-inverting input for comparator channel 3 |
| 腳位 11 | GND — Ground connection |
| 腳位 12 | IN+ 4 — Non-inverting input for comparator channel 4 |
| 腳位 13 | IN− 4 — Inverting input for comparator channel 4 |
| 腳位 14 | OUT 4 — Open-collector output for comparator channel 4 |
典型應用
LM339ANG4 適用於 6 應用s: Industrial Overvoltage and Undervoltage Detection, Multi-Channel Sensor Threshold Switching, Battery Voltage Window Monitoring, Relay and Actuator Control Interface, Dual-Polarity Signal Detection, Digital Logic Level Translation.
Industrial Overvoltage and Undervoltage Detection
The LM339ANG4 is well suited to monitoring a 24 V industrial control rail because its single-supply operating range extends to 30 V, while the stated maximum common-mode input voltage reaches 38 V. Two comparator channels can detect conditions above and below selected thresholds, and the remaining channels can monitor additional rails or supply levels. Each open-collector output can pull a supervisor, relay driver, or PLC input low, with an external pull-up defining the logic-high level. In practical installations, the input network should limit fault current, account for switching transients, and provide filtering when the monitored rail contains pulse-width-modulated noise.
推薦
Multi-Channel Sensor Threshold Switching
The four independent comparators in the LM339ANG4 can evaluate four sensor conditions without requiring four separate IC packages. Each channel compares a conditioned sensor voltage against a reference and changes its open-collector output when the crossing condition occurs. This arrangement is useful for temperature, pressure, level, and proximity sensing where several alarm thresholds must be implemented in a compact controller. The 3 mV maximum offset at 30 V can be important near closely spaced thresholds, while the 0.25 µA maximum input bias current at 5 V helps limit loading of high-impedance sensor networks. Add positive feedback for hysteresis when electrical noise could cause repeated output transitions.
推薦
Battery Voltage Window Monitoring
A pair of LM339ANG4 channels can define an overcharge and undervoltage window around a battery rail, while the other channels monitor auxiliary system voltages. Its supply operation up to 30 V covers many lead-acid and industrial battery systems when the sensing network keeps the input nodes within the 38 V common-mode maximum. Open-collector outputs are useful for driving fault indicators or signaling a system controller because each output can share a pull-up network. In a battery installation, input protection should account for charger spikes, reverse polarity, and load-dump conditions, and the threshold components should have suitable tolerances and temperature stability for the required accuracy.
推薦
Relay and Actuator Control Interface
The LM339ANG4 can convert a low-level sensing decision into an actuator-control signal by comparing an analog threshold with a reference and pulling a relay-driver input low. The typical 20 mA output-current capability supports compatible logic and driver interfaces, although the attached load must remain within the device’s absolute limits and thermal conditions. Because outputs are open collector, multiple comparator channels can share a pull-up and form a wired-AND fault condition. A flyback diode is required when the output controls an inductive relay coil, and the PCB should separate the switching path from sensitive comparison inputs to reduce coupling and false triggering.
推薦
Dual-Polarity Signal Detection
The LM339ANG4’s dual-supply capability of -15 V to +15 V supports sensing signals centered around ground, including positive and negative rail thresholds. This is useful in bipolar analog systems, instrumentation, and audio-related control circuits where a single-sided comparator may not provide adequate signal range. A pull-up resistor can reference the negative rail, ground, or a positive logic rail depending on the required output convention. Designers must ensure that every input remains within the common-mode range under all supply and signal conditions, and should avoid excessive differential input voltage. Ground-plane placement and short comparator paths help reduce noise pickup around the switching threshold.
推薦
Digital Logic Level Translation
The open-collector outputs of the LM339ANG4 can translate between circuits with different logic thresholds by selecting an external pull-up to the destination logic rail. Four channels allow several control or status signals to be converted in one package, and the stated TTL, MOS, and CMOS output compatibility broadens the potential interface choices. Pull-up resistance must satisfy both the destination input current and the comparator’s sink-current limit. Slow pull-up values can increase switching time and susceptibility to capacitive noise, while very low values can increase sink current. Confirm the output voltage, current, timing, and logic-level specifications of the connected device before finalizing the interface.
推薦
推薦產品摘要
工程參考資料，適用於 LM339ANG4 — 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 | LM339AN | LM339N | LM239AN | LM2901AN | LM2901N |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-DIP (0.300 inch, 7.62 mm) | 14-DIP (0.300 inch, 7.62 mm) | 14-DIP (0.300 inch, 7.62 mm) | 14-DIP (0.300 inch, 7.62 mm) | 14-DIP (0.300 inch, 7.62 mm) | 14-DIP (0.300 inch, 7.62 mm) |
| Comparator Channels | 4 channels | 4 channels | 4 channels | 4 channels | 4 channels | 4 channels |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
主要差異化特點
- Four independent channels in one 14-DIP package (對比LM239AN)
- Wide single-supply operating range (對比LM2901AN)
- Open-collector output provides flexible logic interfacing (對比LM339N)
設計說明
Provide a local bypass capacitor near the supply and ground pins to keep supply transients from disturbing all four channels. The comparator is intended for a 2 V to 30 V single-supply range or a -15 V to +15 V dual-supply range. Keep pull-up rails separate from noisy actuator supplies where practical, because output transitions coupled through shared wiring can create false threshold crossings.
Do not omit the external pull-up resistor from an open-collector output. The output transistor pulls the node down but cannot source a logic-high voltage. Select the resistor to meet the receiving gate’s input-current requirements while keeping the comparator sink current below its specified limit. Also verify that the maximum 38 V common-mode and differential input ratings are never exceeded during startup or fault conditions.
Keep comparator input traces short, place threshold-setting resistors near the relevant pins, and maintain a continuous ground reference beneath the device. When the sensed signal can contain noise, use small capacitors or an RC filter at the input, but account for added propagation delay. Positive feedback can create hysteresis and prevent repeated output toggling; calculate the feedback network against the desired noise margin.
Check the exact ordering-grade and temperature requirements before substituting another LM339-family 14-DIP device. A shared footprint does not guarantee identical offset, bias, qualification, or environmental limits. Compare the manufacturer ordering table and electrical characteristics for every channel and worst-case operating condition, especially when the input threshold separation is only a few millivolts.
合規資訊
The available manufacturer and distributor information identifies the device as an active LM339-family comparator but does not establish the requested compliance certifications.
