LM339NG - 3-36V Quad Open-Collector Comparator | onsemi
MPN： LM339NG ✓ 啟用中LM339NG 概覽
An analog comparator is an integrated circuit that determines whether an input voltage is above or below a reference voltage. In the broader electronics hierarchy, a comparator belongs to the analog IC and signal-conditioning category, where it converts a continuously varying voltage relationship into a logic-level decision. Unlike an operational amplifier, a comparator is optimized for fast switching between output states rather than linear amplification.
The four independent LM339NG channels combine a wide supply-voltage range with low input bias current. Verified sources report a typical input bias current of 25 nA, a typical input offset current of ±5 nA, and an input offset voltage of 1.3 mV. The distributor descriptions identify the outputs as open collector, allowing the output stage to sink current rather than actively sourcing it. This architecture requires an external pull-up resistor when the comparator must produce a valid high level.
With a response time of approximately 1.3 microseconds, the LM339NG is suitable for general-purpose detection rather than very high-speed signal comparison. Its 14-pin PDIP construction supports through-hole assembly and is useful in industrial control equipment, automotive electronic modules, consumer appliances, memory-control circuits, and laboratory interface boards. The package is also readily inspected or replaced during maintenance.
A key design consideration is the open-collector output. Each output requires a pull-up resistor to the appropriate logic supply, and the pull-up voltage must not exceed the applicable device limits. Input common-mode range, output saturation, input protection, and supply-current behavior should be checked against the manufacturer datasheet before operation near the supply extremes.
This page consolidates verified distributor information, source-linked specifications, practical application guidance, and cautious drop-in alternatives. It also distinguishes confirmed LM339NG characteristics from attributes that still require full datasheet or application-specific verification before production use.
直接替換替代品，適用於 LM339NG — 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： LM339NG （相同外形與佔位） — 差異在於 Comparator Type, Output Type, Response Time, Differential Input Voltage Range, Input Bias Current.
LM2901NG
✅ 直接替換📋 參考替代品（不在目錄中）
LM339N/NOPB
✅ 直接替換📋 參考替代品（不在目錄中）
LP339N
✅ 直接替換📋 參考替代品（不在目錄中）
LM339NG 最大額定值與電氣特性
| Comparator Count | 4 channels |
| Single-Supply Operating Voltage | 3 V to 36 V |
| Supply Configuration | Single or split supply |
| Comparator Type | General-purpose differential analog comparator |
| 輸出類型 | Open-collector CMOS/TTL-compatible output |
| Input Bias Current | 25 nA typical |
| Input Offset Current | ±5 nA typical |
| Input Offset Voltage | 1.3 mV typical |
| Response Time | 1.3 µs |
| Package Type | 14-pin PDIP |
| Package Pitch | 7.62 mm |
| 腳位數 | 14 pins |
| 安裝方式 | Through-hole PDIP |
| Lead-Free Packaging | Available |
LM339NG 7.62 mm 腳位配置指南
LM339NG（7.62 mm 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： LM339NG.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM339NG 適用於 6 應用s: Industrial Threshold Detection, Automotive Electrical Level Sensing, Memory and Control-System Interlocks, Consumer Appliance Limit Detection, Laboratory and Test Equipment Triggering, Power-Supply Monitoring and Fault Detection.
Industrial Threshold Detection
The LM339NG fits 24 V industrial threshold detection because its four comparator channels operate from a verified 3 V to 36 V single supply. A practical implementation can compare a sensor signal against an adjustable reference and translate the result into a control-system logic state. The open-collector output supports wired sensing, but each channel needs an external pull-up resistor. With a 1.3 mV typical input offset and approximately 1.3 µs response time, the device is appropriate for general process-limit detection rather than ultrafast waveform analysis. Production designs should confirm input common-mode limits, output sink current, transient protection, and thermal performance under the exact 24 V operating conditions.
推薦
Automotive Electrical Level Sensing
The LM339NG can compare 12 V or 24 V vehicle electrical signals against reference levels for warning, enable, or fault-detection functions. Its four channels reduce the component count when multiple independent thresholds must be evaluated, while the 3 V to 36 V operating range covers common automotive battery-derived rails. Open-collector outputs are useful for interfaces that require passive pulling high, subject to the vehicle network’s voltage and fault requirements. The verified data does not identify the base LM339NG as AEC-Q100 qualified, so an automotive production design must verify qualification, temperature grade, load dump behavior, and transient protection separately.
推薦
Memory and Control-System Interlocks
The LM339NG is well suited to memory-control and interlock circuits because four independent comparators can evaluate several logic thresholds on the same board. The approximately 1.3 µs response time is sufficient for general control-loop qualification and status detection, while 25 nA typical input bias current reduces disturbance on high-impedance sensing nodes. Open-collector outputs can provide wired-AND behavior with suitable pull-up resistors, although wired logic requires careful review of rise time and fan-out. Designers should confirm the relevant truth table, output timing, input offset, and logic-level compatibility before using the comparator in a safety-critical interlock chain.
推薦
Consumer Appliance Limit Detection
The LM339NG can supervise temperature, level, or actuator positions in consumer appliances by comparing each sensed voltage against a reference. Four channels allow one package to perform several protection or mode-detection functions without using four separate comparator packages. Its 3 V to 36 V supply range covers low-voltage logic and higher nominal control rails, while the 1.3 mV typical input offset can support reasonably precise threshold decisions. The open-collector outputs require pull-up resistors and should be checked for startup states, false triggering, and fault behavior. A production appliance should also validate humidity, vibration, and temperature requirements beyond the electrical specifications.
推薦
Laboratory and Test Equipment Triggering
The LM339NG can implement general-purpose limit detection and slow trigger functions in laboratory or test equipment. Its four channels allow independent upper- and lower-threshold comparisons, and the approximately 1.3 µs response time is useful when the equipment does not require sub-microsecond switching. The open-collector architecture can trigger an external pull-up signal, but the pull-up resistor determines much of the output rise time and therefore should be selected according to the required logic edge. The 1.3 mV typical input offset and 25 nA typical bias current are useful for moderate-impedance sensing, although precision instrumentation may require additional calibration or a lower-offset reference stage.
推薦
Power-Supply Monitoring and Fault Detection
The LM339NG can supervise multiple power rails or operating conditions by comparing divided feedback voltages against references. Its four-channel architecture is valuable in monitoring systems that must distinguish normal, warning, and fault states, while the wide 3 V to 36 V supply range supports industrial and automotive control environments. Open-collector outputs permit fail-safe wired signals when each output has an appropriate pull-up. Designers should account for the 1.3 mV typical input offset, verify the input common-mode range throughout tolerance, and confirm output timing during supply ramps. Protection devices, filtering, and galvanic-isolation boundaries should be added where the monitored source can exceed the comparator’s safe limits.
推薦
推薦產品摘要
工程參考資料，適用於 LM339NG — 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 | LM2901NG | LM339N/NOPB | LP339N |
|---|---|---|---|---|
| Brand | onsemi | onsemi | Texas Instruments | Texas Instruments |
| Package | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP |
| Comparator Count | 4 channels | 4 channels | 4 channels | 4 channels |
| Output Type | Open collector | Open collector | Open collector | Open collector |
主要差異化特點
- Verified four-channel threshold detection in a through-hole package (對比LM339N/NOPB)
- Wide single-supply operating range (對比LP339N)
- Documented low-level input characteristics (對比LM2901NG)
設計說明
The verified 3 V to 36 V supply range provides broad operating headroom, but every open-collector output needs an external pull-up resistor. Calculate the pull-up current using the required high-state voltage and output leakage, then confirm that the comparator can sink the resulting current. Keep the pull-up rail within the device output limits and account for resistor power dissipation and output rise time.
Do not infer the LM339NG pinout from a generic quad-comparator diagram because the verified excerpts do not provide the actual numbered table. Download the current manufacturer datasheet and confirm each differential input, output, supply, and ground connection before PCB assembly. Also verify input common-mode limits at the minimum and maximum supply voltages; a device can be powered correctly while its inputs remain outside the valid comparison range.
Place the comparator inputs and supply bypass components close to the corresponding pins to reduce susceptibility to switching noise and ground bounce. Route high-impedance input traces away from power-switching nodes and digital output edges. Because the device is intended for general-purpose sensing with a 1.3 µs response time, add filtering only after checking that the resulting delay does not disrupt the intended threshold-control behavior.
合規資訊
The verified manufacturer description states that Pb-free packages are available. RoHS, REACH, halogen-free, conflict-minerals, and AEC-Q100 status were not explicitly confirmed. AEC-Q100 is marked not_qualified because the supplied data identifies automotive applications but does not state that LM339NG is AEC-Q100 qualified.