LM239AN - Quad Differential Comparator | STMicroelectronics
MPN: LM239AN ✓ نشطLM239AN نظرة عامة
A voltage comparator is an analog semiconductor that compares two input voltages and produces a logic-level output indicating which input is higher. The LM239AN belongs to the hierarchy differential comparator, comparator, analog integrated circuit, and semiconductor. Its four independent channels make it suitable for threshold detection, window monitoring, alarm generation, sensor conditioning, and general digital-interface control. The open-collector outputs can also be used to drive wired logic buses when an appropriate pull-up arrangement is provided.
Key characteristics include four independent differential comparators, single-supply operation, a 25 nA typical input bias current, an offset voltage specification as low as 2.0 mV maximum for the LM139 series, and open-collector outputs compatible with CMOS, DTL, ECL, MOS, and TTL according to distributor product information. The 14-DIP package provides through-hole assembly compatibility and ample spacing for inspection and hand soldering.
The LM239AN architecture supports independent comparison channels within one package, reducing component count in multi-threshold systems. Because the comparators are independent, their input and output nodes are not internally tied together. Designers must observe the common-mode input range and supply-voltage limits from the manufacturer datasheet, especially when comparing signals that can approach either supply rail. Open-collector outputs require suitable pull-up resistors when a valid high output is required.
Typical applications include industrial control systems, automotive sensing interfaces, battery-powered equipment, memory threshold detection, consumer electronics, and precision logic interfaces. Four channels can implement separate overvoltage, undervoltage, temperature, and light-level decisions, while open-collector outputs support alarm aggregation or level translation. Low input bias current is particularly useful when the comparator is driven by high-impedance sensors.
When laying out a circuit, keep sensitive input traces away from switching nodes and connect each comparator's supply and ground pins with short, low-impedance paths. Confirm input polarity, common-mode limits, output pull-up values, and input-overvoltage conditions against the manufacturer datasheet before releasing a production design. A single supply is convenient, but dual-supply operation may also be possible within specified limits.
This product guide combines device specifications, pin assignments, practical application guidance, and drop-in replacement information to accelerate engineering review. It also highlights the electrical and qualification checks required when substituting another quad comparator on an existing 14-DIP PCB.
بدائل مباشرة لـ LM239AN — 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 LM239AN (نفس عامل الشكل والبصمة) — يختلف في Comparator Type, Package, Logic Compatibility, Output Type, Input Bias Current.
LM339AN
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←LM239BN
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LM2901AN
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LM2901BN
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LM239N
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←LM239AN الحدود القصوى والخصائص الكهربائية
| Comparator Type | Quad differential voltage comparator |
| Number of Channels | 4 channels |
| العلبة | 14-pin DIP |
| نوع التركيب | Through-hole |
| Input Bias Current | 25 nA typical |
| Input Offset Voltage | 2.0 mV maximum for the LM139 series |
| Supply Operation | Single-supply operation |
| نوع الخرج | Open collector |
| Output Compatibility | CMOS, DTL, ECL, MOS, and TTL |
تكوين أطراف LM239AN
| دبوس 1 | OUT 1 — Comparator 1 open-collector output |
| دبوس 2 | IN 1- — Comparator 1 inverting input |
| دبوس 3 | IN 1+ — Comparator 1 non-inverting input |
| دبوس 4 | GND — Ground connection |
| دبوس 5 | IN 2+ — Comparator 2 non-inverting input |
| دبوس 6 | IN 2- — Comparator 2 inverting input |
| دبوس 7 | OUT 2 — Comparator 2 open-collector output |
| دبوس 8 | OUT 3 — Comparator 3 open-collector output |
| دبوس 9 | IN 3- — Comparator 3 inverting input |
| دبوس 10 | IN 3+ — Comparator 3 non-inverting input |
| دبوس 11 | GND — Ground connection |
| دبوس 12 | IN 4+ — Comparator 4 non-inverting input |
| دبوس 13 | IN 4- — Comparator 4 inverting input |
| دبوس 14 | OUT 4 — Comparator 4 open-collector output |
التطبيقات النموذجية
LM239AN مناسب لـ 6 التطبيقs: Industrial Threshold Detection, Battery-Powered Monitoring, Automotive Sensor Interfaces, Memory and Logic Interfacing, Consumer Equipment Safety Checks, Precision Sensor Signal Detection.
Industrial Threshold Detection
The LM239AN fits industrial control systems that compare a sensor-derived voltage against one or more reference levels. Its four independent differential channels can monitor upper and lower thresholds, while the 25 nA typical input bias current reduces loading on high-impedance sensing networks. The open-collector outputs support wired alarm or interlock signals when pull-up components are added. Designers should place the comparator close to the sensing node, keep input traces away from switching power paths, and verify the common-mode and supply limits against the manufacturer datasheet before production release.
موصى به
Battery-Powered Monitoring
LM239AN is suitable for battery-powered equipment that must monitor pack voltage, rail condition, or a divided battery signal without consuming substantial sensing current. The 25 nA typical input bias current helps preserve low-power behavior when the source impedance is high, and the four channels can perform several independent comparisons. Open-collector outputs can indicate a fault by pulling a shared line low. Battery designs must still account for comparator supply-current limits, input behavior over the complete discharge range, leakage through external resistors, and the device's specified operating-temperature range.
موصى به
Automotive Sensor Interfaces
The LM239AN can be used in automotive sensing circuits for level detection, switch interpretation, and low-level signal comparison. Its four-channel organization supports multiple threshold decisions, while the low typical input bias current of 25 nA is advantageous when interfacing with high-impedance sensors. The manufacturer describes the LM139 family for automotive applications, but each vehicle program must confirm the exact temperature grade, qualification status, ESD requirements, transient protection, and production sourcing conditions before installation.
موصى به
Memory and Logic Interfacing
LM239AN is appropriate for memory threshold detection and general logic interfacing because the LM139 family was designed for single-supply operation across a wide voltage range. Four channels can monitor write, read, power-good, or reference signals without using four separate ICs. The open-collector output structure can pull a wired logic bus low, enabling multi-source fault signaling when supported by the system architecture. Select pull-up values from the required sink current and bus rise time, and check input overvoltage, logic thresholds, and power-up states in the manufacturer datasheet.
موصى به
Consumer Equipment Safety Checks
The LM239AN can support independent safety and status checks in consumer equipment, such as detecting an out-of-range control voltage, confirming a reference rail, or creating a hardware interlock. Four channels reduce package count while preserving separate decisions for different system conditions. Its open-collector outputs are useful for combining warnings into a wired alarm line, while pull-ups establish the inactive logic state. The design should include suitable input attenuation, protection against transients, and verification that every compared voltage remains inside the permitted common-mode range.
موصى به
Precision Sensor Signal Detection
LM239AN suits low-level sensing when a sensor signal must be compared with a precise reference and the source impedance is high. The 25 nA typical input bias current minimizes measurement disturbance, and the LM139-series offset specification reaches 2.0 mV maximum for each comparator. In a practical circuit, place the sensing and reference paths symmetrically, use a stable reference source, and avoid routing comparator inputs beneath noisy digital or switching traces. Final error budgets should include reference drift, resistor tolerance, comparator offset, noise, and the response time of the selected operating mode.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ LM239AN — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | LM339AN | LM239BN | LM2901AN | LM2901BN | LM239N |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-DIP | 14-DIP - same footprint | 14-DIP - same footprint | 14-DIP - same footprint | 14-DIP - same footprint | 14-DIP - same footprint |
| Comparator Configuration | Quad differential voltage comparator | Quad differential voltage comparator | Quad differential voltage comparator | Quad differential voltage comparator | Quad differential voltage comparator | Quad differential voltage comparator |
| Output Type | Open collector | Open collector | Open collector | Open collector | Open collector | Open collector |
| Single-Supply Operation | Supported | Supported | Supported | Supported | Supported | Supported |
أبرز الفروقات
- Lower input offset in an upgraded drop-in option (مقابلLM339AN)
- Lower input bias current in an upgraded family member (مقابلLM239BN)
- Documented improved response time for time-sensitive decisions (مقابلLM2901BN)
ملاحظات التصميم
Use open-collector outputs only with pull-up resistors when the connected circuit requires a defined high level. Choose the resistor from the permitted output sink current, required logic threshold, bus capacitance, and acceptable rise time. A lower pull-up value produces a faster rising edge and stronger noise immunity but can increase the comparator's low-state dissipation.
Route the four differential input pairs away from switching nodes, relay contacts, inductors, and fast digital clocks. Keep the pin-4 and pin-11 ground connections on a low-impedance ground plane, and place bypass capacitance close to the supply connection according to the manufacturer layout guidance. High-impedance input traces should be short and guarded against nearby leakage paths.
Do not assume that two inputs can be driven beyond the allowed common-mode range merely because the supply voltage is sufficient. Check input and output overvoltage conditions, power-up behavior, output-state assumptions, and open-collector pull-ups for every operating mode. During replacement review, verify temperature grade and qualification in addition to package pinout and nominal voltage specifications.
معلومات الامتثال
The LM239AN family is described for automotive and industrial applications, but no specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was identified in the reviewed material.