LM339DE4 - 4-Channel Open-Collector Comparator | Texas Instruments
MPN： LM339DE4 ✓ 啟用中LM339DE4 概覽
A comparator is an analog integrated circuit that determines whether one input voltage is above or below another input voltage. The LM339 belongs to the comparator IC category within the broader hierarchy of analog integrated circuits and semiconductors. Its four channels share power and ground connections but operate independently, allowing one package to perform four comparison functions without requiring four separate single-channel devices.
Key features include a 38 V maximum rating, low input offset voltage of 0.37 mV, low input bias current of 3.5 nA, and supply-current consumption of 200 uA per comparator. The open-collector outputs can sink current from external pull-up circuitry, which allows a system designer to select the output logic voltage independently and also supports wired-AND behavior when multiple comparator outputs are connected together.
The LM339 family supports single-supply or dual-supply operation. Its common-mode input range includes ground, while the differential input range can extend to plus or minus 38 V according to the manufacturer product information. Outputs are compatible with TTL, MOS, and CMOS logic. These characteristics make the device useful where a low-voltage control system must monitor signals operating at higher voltage levels.
Typical applications include industrial sensor interfaces, battery monitoring, overvoltage and undervoltage detection, motor-control feedback, window comparators, and digital threshold translation. The four-channel organization is especially useful when a board needs several independent protection or level decisions. Each open-collector output requires an appropriate pull-up resistor unless it drives a compatible external load or relay stage.
PCB design should keep comparator inputs away from high-current switching paths and provide a low-impedance ground reference. Place bypass capacitance close to the supply and ground pins, use short analog traces, and avoid connecting long external wires directly to the input pins without suitable filtering. Input protection may be needed when transients or ESD events exceed the application's normal operating conditions.
This page organizes the LM339DE4 electrical characteristics, pinout, sourcing guidance, application examples, and qualified same-footprint alternatives into a compact engineering reference. It also identifies the practical differences that must be checked before replacing a comparator in an existing design, particularly supply limits, input common-mode range, output pull-up requirements, and temperature grade.
直接替換替代品，適用於 LM339DE4 — 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： LM339DE4 （相同外形與佔位） — 差異在於 Logic Compatibility, Output Type, Package, Product Type.
LM339BDE4
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM239DE4
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM2901DE4
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM339DE4 最大額定值與電氣特性
| Comparator Count | 4 |
| Product Type | Quad differential comparator |
| Maximum Supply Voltage Rating | 38 V |
| Tested Supply Voltage | 30 V |
| Non-V Device Tested Supply Voltage | 32 V |
| Low Input Offset Voltage | 0.37 mV |
| Low Input Bias Current | 3.5 nA |
| Supply Current per Comparator | 200 uA |
| Classic Family Supply Current Drain | 0.8 mA typical |
| Differential Input Voltage Range | -38 V to +38 V |
| Common-Mode Input Voltage Range | Includes ground |
| 輸出類型 | Open collector |
| Logic Compatibility | TTL, MOS, and CMOS |
| Human Body Model ESD Rating | 2 kV |
| 封裝 | 14-SOIC, 3.90 mm width |
| 安裝類型 | Surface mount |
LM339DE4 腳位配置
| 腳位 1 | OUT1 — Open-collector output for comparator channel 1 |
| 腳位 2 | IN1- — Inverting input for comparator channel 1 |
| 腳位 3 | IN1+ — Non-inverting input for comparator channel 1 |
| 腳位 4 | GND — Ground connection |
| 腳位 5 | IN2+ — Non-inverting input for comparator channel 2 |
| 腳位 6 | IN2- — Inverting input for comparator channel 2 |
| 腳位 7 | OUT2 — Open-collector output for comparator channel 2 |
| 腳位 8 | OUT3 — Open-collector output for comparator channel 3 |
| 腳位 9 | IN3- — Inverting input for comparator channel 3 |
| 腳位 10 | IN3+ — Non-inverting input for comparator channel 3 |
| 腳位 11 | GND — Ground connection |
| 腳位 12 | IN4+ — Non-inverting input for comparator channel 4 |
| 腳位 13 | IN4- — Inverting input for comparator channel 4 |
| 腳位 14 | OUT4 — Open-collector output for comparator channel 4 |
典型應用
LM339DE4 適用於 6 應用s: Industrial Sensor Threshold Detection, Battery Voltage Monitoring, Overvoltage and Undervoltage Protection, Window Comparator and Limit Detection, Motor and Actuator Feedback, Logic-Level Translation.
Industrial Sensor Threshold Detection
The LM339DE4 is suitable for comparing a conditioned sensor signal with a reference voltage in industrial monitoring equipment. Its four independent channels can evaluate temperature, pressure, level, or current-sensor thresholds without requiring four separate comparator packages. The 0.37 mV input offset supports fine threshold placement, while the 3.5 nA input bias current minimizes loading on high-impedance sensor stages. Open-collector outputs can pull up to the system logic rail and may also drive an alarm input through a suitable interface. Place the sensor return and comparator ground on a low-impedance path, and verify the input common-mode range for the actual sensor voltage.
推薦
Battery Voltage Monitoring
The LM339DE4 can implement several battery-pack protection thresholds using its four differential comparator channels. Each channel compares a divided battery voltage against a reference or another divided node, allowing overvoltage, undervoltage, and imbalance conditions to be detected independently. The common-mode input range includes ground, which is useful in single-supply battery systems, and the differential input range supports sensing beyond the logic supply under the specified limits. Because the outputs are open collector, each event indication can use an independent pull-up or be combined with other fault signals. Validate the resistor-divider tolerance and ensure that the maximum battery voltage cannot exceed the comparator's absolute limits.
推薦
Overvoltage and Undervoltage Protection
The LM339DE4 is useful in power-system protection because four channels can supervise multiple rails or a single rail against different limits. The 38 V maximum rating provides substantial headroom for 12 V, 24 V, or industrial supply monitoring, while the low 0.37 mV offset helps reduce uncertainty around protection thresholds. Each open-collector output can operate as an active-low fault signal with an external pull-up, or sink current into an isolation or shutdown stage. Account for resistor-divider tolerance, transient overshoot, and the power-down behavior of the monitored rail. The design must also prevent a transient at the sensing node from exceeding the differential or common-mode limits.
推薦
Window Comparator and Limit Detection
A window comparator uses two channels to define upper and lower limits, while the LM339DE4 can monitor additional windows without increasing the package count. Its four channels share the same supply connections, making the device efficient for compact control boards that must report several acceptable operating ranges. The 3.5 nA input bias current is beneficial when the compared voltage comes from a high-impedance divider or sensor source. Open-collector outputs allow individual status indicators to use common pull-up logic. Because each comparator reacts to differential input polarity rather than a fixed absolute threshold, resistor tolerances and input offset can shift both window boundaries; include the worst-case tolerance when defining system limits.
推薦
Motor and Actuator Feedback
The LM339DE4 can supervise feedback or position-related voltages in motor-control and actuator electronics. Four channels can monitor a command level, a feedback signal, a current threshold, and an overtravel limit, with open-collector outputs providing active-low fault indications. The low input bias current reduces the loading effect on feedback dividers, and the common-mode range including ground supports single-supply implementations. An output transistor may sink current into a driver-interface stage, but it must not directly drive a relay or high-current motor without an additional driver and appropriate protection. Keep motor return current out of the comparator ground path and add filtering to avoid false triggering from switching transients.
推薦
Logic-Level Translation
The LM339DE4 can translate higher-voltage logic signals into a lower-voltage system because its open-collector output level is set by an external pull-up resistor rather than a fixed internal high-voltage source. A suitable pull-up connects each output to the destination logic rail, while a comparator channel determines whether the source voltage is above or below a reference. The Texas Instruments family information identifies output compatibility with TTL, MOS, and CMOS logic. This arrangement is useful when a 5 V controller must monitor a higher-voltage signal, although the source and destination devices must both remain inside the comparator's common-mode and differential limits. Confirm output timing and leakage current at the selected pull-up value.
推薦
推薦產品摘要
工程參考資料，適用於 LM339DE4 — 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 | LM339BDE4 | LM239DE4 | LM2901DE4 | LM339D |
|---|---|---|---|---|---|
| Package | 14-SOIC | 14-SOIC - same footprint | 14-SOIC - same footprint | 14-SOIC - same footprint | 14-SOIC - same footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics |
| Comparator Count | 4 | 4 | 4 | 4 | 4 |
| Output Configuration | Open collector | Open collector | Open collector | Open collector | Open collector |
主要差異化特點
- Four comparator channels in one 14-pin SOIC package (對比LM2904P3)
- Low input offset and bias for precise threshold sensing (對比LM339D)
- High-voltage capability for industrial sensing (對比LM2904P3)
設計說明
Place the LM339DE4 close to the circuits whose voltages it monitors, and route each input through a short, quiet analog path. Keep switching-node copper and high-current return paths away from the input pins because a small transient at a high-impedance input can create an incorrect comparison result. Connect the two ground pins to a low-impedance ground plane or net, and provide a direct return path for the supply bypass capacitor rather than routing its return through sensitive analog traces.
Do not treat the open-collector output as a push-pull logic output. Each channel requires a pull-up resistor unless an equivalent pull-up network already exists in the circuit. Calculate the maximum pull-up current when the output transistor is saturated, and select a resistor large enough to limit that current while meeting the receiver's rise-time requirement. Never connect two outputs with different pull-up voltages directly together, and do not use the output pin to source current.
Add input filtering when sensor cables or long PCB routes can introduce transients. A series resistor with a small input-side capacitor can limit high-frequency energy, but excessive capacitance may slow the comparator transition or increase noise sensitivity. Check that the filtered input remains inside the common-mode range under every operating condition. The 2 kV human-body-model ESD rating describes device-level immunity and does not remove the need for board-level surge or ESD protection.
The LM339DE4 is intended for low-voltage supply operation and includes a 38 V maximum rating, not a recommendation to operate continuously at 38 V. Derive the sensing-divider and pull-up rails so that the minimum and maximum expected voltages remain inside the device limits. Use separate local bypass capacitance near the supply pin, and account for supply ramp behavior because an open-collector output can change state during power-up as the internal reference and logic node settle.
合規資訊
No specific environmental or automotive qualification declarations were identified for LM339DE4. The comparator is a general-purpose analog IC rather than an automotive-qualified variant.