LM339AN/NOPB - Quad Open-Collector Comparator | TI
MPN: LM339AN/NOPB ✓ نشطLM339AN/NOPB نظرة عامة
A differential voltage comparator is an analog integrated circuit that compares two input voltages and changes its output state according to their relationship. The LM339 belongs to the comparator hierarchy within analog interface ICs and power-management systems. Its four independent channels let one package implement several threshold, window, overvoltage, or polarity decisions while sharing a common supply and ground.
Each LM339 channel provides low-offset operation, low input bias current, and an open-collector transistor output. Open-collector outputs permit wired AND or NOR logic, use pull-up resistors, and can directly interface with TTL, MOS, and CMOS-compatible inputs. The ability to set a rising or falling threshold with external resistors makes the device useful for both positive-going and negative-going decisions.
The architecture contains four independent comparator sections rather than a shared digital control interface. Because the outputs are open collector, output speed depends on the pull-up resistance, load capacitance, transistor sink current, and the time required to discharge the load node. Low output voltage and a small number of external components also make the LM339 practical where the logic load is tolerant of a passive pull-up network.
Typical uses include DC voltage threshold detection, temperature-sensor signal conditioning, battery and power-supply monitoring, motor or relay control, window comparators, and industrial sensor interfaces. The 14-pin PDIP package is especially useful for through-hole assemblies, prototype boards, repair work, and designs where socketed or manually inserted components simplify maintenance.
When assigning inputs, keep each noninverting and inverting connection within the comparator's permitted common-mode range, and do not allow the differential input to exceed the device's absolute maximum rating. Select a pull-up resistor that provides adequate sink-current margin and a rise time compatible with the downstream logic. Because an open-collector output can remain off, the external pull-up also determines the inactive logic level.
This product page combines the exact LM339AN/NOPB ordering information with package dimensions, pin assignment, practical interface guidance, and technically qualified substitution options. It supports faster component selection by showing where the part fits, which electrical details require confirmation from the manufacturer datasheet, and how candidate replacements differ in temperature grade or low-power behavior.
بدائل مباشرة لـ LM339AN/NOPB — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع LM339AN/NOPB (نفس عامل الشكل والبصمة) — يختلف في Comparator Type, Output Type, Mounting Type, Number of Channels, Package.
LM339N/NOPB
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←LM339NG
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←LM2901NG
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LP339N
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LM239N
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←LM339AN/NOPB الحدود القصوى والخصائص الكهربائية
| Comparator Type | General-purpose differential voltage comparator |
| Number of Channels | 4 channels |
| نوع الخرج | Open collector |
| Supply Voltage Range | 2 V to 36 V |
| Single-Supply Maximum | 36 V |
| Dual-Supply Maximum | ±18 V |
| Common-Mode Input Voltage Range | Ground to 36 V |
| Differential Input Voltage Range | ±36 V |
| العلبة | 14-pin PDIP, 0.3 inch width |
| نوع التركيب | Through-hole insertion |
| عدد الدبابيس | 14 pins |
تكوين أطراف LM339AN/NOPB
| دبوس 1 | 1OUT — Comparator 1 open-collector output |
| دبوس 2 | 1IN- — Comparator 1 inverting input |
| دبوس 3 | 1IN+ — Comparator 1 noninverting input |
| دبوس 4 | GND — Ground reference |
| دبوس 5 | 2IN+ — Comparator 2 noninverting input |
| دبوس 6 | 2IN- — Comparator 2 inverting input |
| دبوس 7 | 2OUT — Comparator 2 open-collector output |
| دبوس 8 | 3OUT — Comparator 3 open-collector output |
| دبوس 9 | 3IN- — Comparator 3 inverting input |
| دبوس 10 | 3IN+ — Comparator 3 noninverting input |
| دبوس 11 | VCC — Positive supply connection |
| دبوس 12 | 4IN+ — Comparator 4 noninverting input |
| دبوس 13 | 4IN- — Comparator 4 inverting input |
| دبوس 14 | 4OUT — Comparator 4 open-collector output |
التطبيقات النموذجية
LM339AN/NOPB مناسب لـ 6 التطبيقs: Battery Threshold Monitoring, Industrial Sensor Interfacing, Temperature Alarm Circuit, Power-Supply Fault Detection, Motor and Relay Control, Window and Limit Comparators.
Battery Threshold Monitoring
The LM339AN/NOPB can implement several threshold decisions in a battery-management subsystem because it combines four independent comparators with a 2 V to 36 V single-supply range. Divide higher pack voltages into the input common-mode range, compare each divided signal with resistor-defined references, and use the open-collector outputs to report pack-state events. This arrangement avoids allocating a separate comparator IC for every threshold. The principal design constraint is keeping every input inside the common-mode range and accounting for offset voltage when setting thresholds close together. Pull-up resistors establish the inactive logic level, while their resistance determines how quickly each fault signal rises when its output transistor turns off.
موصى به
Industrial Sensor Interfacing
The LM339AN/NOPB is useful for converting analog sensor conditions into digital control events in industrial equipment. Its four channels can monitor temperature, pressure, level, or position signals against independently adjustable references. The wide 2 V to 36 V operating range supports unipolar sensor systems, while the input common-mode range from ground to 36 V reduces level-shifting requirements when signals remain inside that window. For reliable factory behavior, include input filtering, account for resistor tolerance and input offset, and use separate pull-up resistors when multiple outputs must rise quickly or drive multiple loads. An industrial design should also confirm the selected part's temperature rating against the enclosure's worst-case ambient temperature.
موصى به
Temperature Alarm Circuit
A single LM339AN/NOPB can supervise multiple temperature thresholds by using its four comparator channels against a sensor or resistor network. Each open-collector output can pull down an alarm line when its corresponding threshold is crossed, and an external pull-up returns the line high during normal operation. The quad-channel arrangement reduces package count compared with four single comparators while retaining independent references. Design the sensor interface so its output remains within the LM339's common-mode range, and include hysteresis to prevent chatter around the switching point. Select the pull-up value to balance output rise time against sink current, then validate the threshold accuracy over temperature because sensor slope, resistor tolerance, and comparator offset all contribute to the total error.
موصى به
Power-Supply Fault Detection
The LM339AN/NOPB can supervise rectified or regulated power rails by comparing divided rail voltages against reference levels. Four channels allow an economical implementation of undervoltage, overvoltage, and sequence-related decisions in one 14-pin PDIP. The wide supply and common-mode ranges are useful in 24 V industrial systems when the sensing network keeps comparator inputs within their rated range. Because the outputs are open collector, they can directly pull down a fault-summary line with a pull-up resistor, or drive a suitable logic input. Confirm absolute input limits, input bias effects, and output sink capability in the manufacturer datasheet. For a replacement with a wider industrial temperature range, compare LM2901NG before finalizing the BOM.
موصى به
Motor and Relay Control
The LM339AN/NOPB can compare a control or feedback signal and switch an open-collector output to activate protection, relay, or motor-control circuitry. Its four channels allow several independent limit checks to share one package, while the 2 V to 36 V supply range supports many 12 V and 24 V systems. Because the output only sinks current, a pull-up resistor or suitable driver interface is required; do not use the comparator output to drive a relay coil directly. Place input traces away from motor-switching nodes, provide filtering on sensed signals, and check the load's switching voltage against the comparator output ratings. Choose LM2901NG when the surrounding motor-control equipment requires a broader industrial temperature range.
موصى به
Window and Limit Comparators
Two LM339AN/NOPB comparator channels can be cross-coupled to form a window comparator that detects whether a measured voltage lies between an upper and lower limit. The other two channels can provide independent overvoltage or undervoltage indications. Open-collector outputs make it straightforward to combine status events through pull-up resistors, although the logic interpretation depends on the chosen wiring. This arrangement is valuable in test equipment, instrumentation, and automated control systems where multiple limit decisions must be made. Avoid relying on exact threshold equality because input offset, resistor tolerance, and input bias current shift the effective trip points. Add positive feedback for clean hysteresis, and use the manufacturer's pin and characteristic tables to verify every comparator channel's configuration.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ LM339AN/NOPB — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | LM339N/NOPB | LM339NG | LM2901NG | LP339N | LM239N |
|---|---|---|---|---|---|---|
| Package | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Comparator Count | 4 | 4 | 4 | 4 | 4 | 4 |
| Output Type | Open collector | Open collector | Open collector | Open collector | Open collector | Open collector |
| Single-Supply Maximum | 36 V | 36 V | 36 V | 36 V | 36 V | 36 V |
| Dual-Supply Maximum | ±18 V | ±18 V | ±18 V | ±18 V | ±18 V | ±18 V |
| Common-Mode Input Range | Ground to 36 V | Ground to 36 V | Ground to 36 V | Ground to 36 V | Ground to 36 V | Ground to 36 V |
| Differential Input Range | ±36 V | ±36 V | ±36 V | ±36 V | ±36 V | ±36 V |
| Low-Power Family Variant | LM339 low-power family | LM339 low-power family | LM339 low-power family | LM2901 industrial family | LP low-power family | LM239 family |
أبرز الفروقات
- Four independent threshold channels in one package (مقابلLM2901NG)
- Direct documented same-package replacement path (مقابلLM339N/NOPB)
- Lower-power family alternative remains pin-compatible (مقابلLP339N)
- Temperature-grade choice for industrial use (مقابلLM2901NG)
ملاحظات التصميم
Place a high-frequency ceramic bypass capacitor and a larger local energy-storage capacitor close to the LM339AN/NOPB VCC and ground pins. Keep the current loop compact and connect the capacitor ground directly to the device ground rather than through a long shared path. The LM339 supports a wide 2 V to 36 V supply range, but bypassing remains important because comparator output transitions and attached digital loads can create supply disturbances. Verify capacitor voltage rating and DC-bias derating above the expected rail voltage.
Do not assume that an open-collector output can source current. Each output requires an external pull-up resistor to establish a high voltage, and the resistor must allow the LM339 to sink the load current while maintaining a valid low level. Conversely, a very small pull-up increases sink current and dissipation, while a very large pull-up slows the rising edge through parasitic capacitance. Check output low voltage, sink-current limits, downstream input thresholds, and maximum logic rise time together.
Assign the four comparator channels according to the numbered PDIP pinout and route sensitive input traces away from relay-coil wiring, switching nodes, and the pull-up return path. Ground the input-referenced network close to the comparator rather than returning noisy current through the package ground lead. If a channel drives a cable or long trace, use series resistance or filtering at the input. The large common-mode range does not remove the need to prevent transient input overvoltage.
Set switching thresholds with both offset and tolerance included in the error budget. Resistor tolerance changes the reference voltage, input offset shifts the comparison point, and input bias current creates error through finite source resistance. For threshold systems, add deliberate positive feedback to create hysteresis and prevent repeated output transitions. Verify that every input remains within the common-mode range and that differential input transients remain below the absolute maximum rating.
معلومات الامتثال
The LM339 family is a general-purpose analog comparator rather than an automotive-qualified AEC-Q100 device. Confirm current RoHS, REACH, lead-free, halogen-free, and conflict-minerals declarations for the exact orderable suffix and package.
