LM339DBRE4 - Quad Comparator, 14-SSOP | Texas Instruments
MPN: LM339DBRE4 ✓ نشطLM339DBRE4 نظرة عامة
A voltage comparator is an analog semiconductor that compares two input voltages and changes its output state when the non-inverting input becomes higher than the inverting input. The LM339 belongs to the broader comparator hierarchy, combining four independent channels in one integrated circuit. This integration reduces component count and simplifies designs requiring multiple threshold, sorting, or signal-level decisions.
The principal features of the LM339DBRE4 include four independent comparator channels, an open-collector output architecture, and supply-current drain that is largely independent of supply voltage. The device operates from single or split supplies, with the total supply span specified from 2 V to 36 V. Its input stage supports low input-bias current, while the output stage is designed for compatibility with TTL, MOS, and CMOS logic.
Because the outputs are open collector, each channel requires an external pull-up resistor when a logic-high output is required. This arrangement permits the output transistor to remain off during the high state, reducing quiescent demand and allowing bus-oriented implementation. The outputs can also be wired together for wired-AND behavior where appropriate. The differential input range is unusually wide for a comparator, which makes the device useful where signal inputs can exceed the supply-referenced logic thresholds.
Typical uses include industrial control and monitoring, sensor-interface thresholds, overvoltage and undervoltage detection, panel and system interlocks, and general-purpose analog decision circuits. Four channels allow one device to supervise several independent conditions. Open-collector outputs are especially useful when a monitored line must pull down a shared alarm or interlock node until every external pull-up has returned to its inactive state.
When designing the PCB, place the pull-up resistors close to the relevant output pins and keep comparator input traces away from switching nodes and output-return currents. The wide common-mode and differential ranges support robust industrial systems, but input protection and supply-decoupling practices remain essential when external wiring can introduce transients. Consult the manufacturer datasheet for the complete electrical limits and application guidance.
This product page combines package, electrical, application, and substitution guidance for engineers evaluating the LM339DBRE4. It highlights the four-channel open-collector architecture, verified operating attributes, pinout considerations, and same-footprint alternatives that can be screened against temperature range and qualification requirements before design release.
بدائل مباشرة لـ LM339DBRE4 — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
LM339BDBR
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
LM2901BDBR
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
LM239DBR
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
LM139DBR
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
LM339B
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LM339DBRE4 الحدود القصوى والخصائص الكهربائية
| Comparator Type | Quad differential voltage comparator |
| Number of Channels | 4 channels |
| Supply Configuration | Single supply or dual supply |
| Tested Maximum Supply Voltage | 30 V |
| Total Supply Voltage Range | 2 V to 36 V |
| Differential Input Voltage Range | -38 V to +38 V |
| Supply Current Drain | 0.8 mA typical |
| نوع الخرج | Open collector |
| Logic Compatibility | TTL, MOS, and CMOS compatible |
| العلبة | 14-pin SSOP |
| Package Width | 5.30 mm |
| Lead Pitch | 0.209 in |
| نوع التركيب | Surface mount |
دليل تكوين أطراف LM339DBRE4 5.30 mm
تكوين الأطراف لـ LM339DBRE4 (حزمة 5.30 mm). يتميز هذا المكوّن التناظري بأطراف الإدخال والإخراج وإمداد الطاقة. راجع ورقة بيانات الشركة المصنعة لتكوينات طرف إلغاء الإزاحة والتعويض والتمكين. مثالي لدوائر تكييف الإشارة والمضخمات.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ LM339DBRE4.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
LM339DBRE4 مناسب لـ 6 التطبيقs: Industrial Threshold Detection, Overvoltage and Undervoltage Supervision, Sensor Signal Conditioning, Industrial Alarm and Interlock Systems, Battery and Automotive Monitoring Circuits, Control and Measurement Systems.
Industrial Threshold Detection
The LM339DBRE4 fits industrial threshold-detection circuits because four independent channels can monitor separate analog conditions within one 14-pin SSOP. Each comparator can evaluate a sensor signal against a reference and control an open-collector node, while the 2 V to 36 V total supply range accommodates conventional industrial rails. External pull-up resistors establish the inactive logic level. A practical design should keep the reference divider close to the input, use a stable reference source, and protect externally connected sensor lines against transients.
موصى به
Overvoltage and Undervoltage Supervision
The LM339DBRE4 can supervise multiple power-related thresholds using its four differential comparator channels. The wide differential input range, stated as equal to the maximum-rated supply voltage and reaching ±38 V, allows the device to compare signals that may extend beyond ordinary logic levels. Open-collector outputs make it possible to combine fault indications into a shared wired-AND alarm. Designers should verify the applicable common-mode limits and add suitable input protection when the monitored bus can experience large transients.
موصى به
Sensor Signal Conditioning
The LM339DBRE4 is useful for converting sensor-derived analog levels into logic-compatible decisions. Four channels can compare bridge, thermocouple, potentiometer, or other conditioned sensor outputs against independent thresholds, reducing the number of discrete comparator packages required. Its 0.8 mA typical supply-current drain and low-input-bias architecture help preserve weak sensor signals. Keep high-impedance input paths short, separate them from switching-current paths, and select pull-up values that balance rise time with output-sink capability.
موصى به
Industrial Alarm and Interlock Systems
The LM339DBRE4 supports multi-condition alarm and interlock systems because its open-collector outputs can share a common pull-up node. A fault condition pulls the node low, allowing several independent events to be combined without creating contention between active outputs. The four-channel arrangement suits machinery monitoring, cabinet-door detection, supply supervision, and system-enable interlocks. Use a pull-up voltage compatible with the connected logic, confirm the maximum sink current for the chosen resistor, and add fail-safe behavior where loss of power must produce a defined alarm state.
موصى به
Battery and Automotive Monitoring Circuits
The LM339DBRE4 can support battery-pack and automotive monitoring functions where multiple supply thresholds must be checked with limited board space. The broad differential input capability is valuable for signals outside normal logic rails, and the open-collector outputs can drive a low-current alert or inhibit circuit. The exact temperature grade must be checked before using the LM339DBRE4 in an automotive environment; a qualified LM2901-family or other grade may be required. Transient protection and load-dump analysis are essential for externally connected automotive nodes.
موصى به
Control and Measurement Systems
The LM339DBRE4 is appropriate for general control and measurement systems requiring several independent comparison decisions. Four channels can evaluate set points, direction signals, limit states, or control-loop error conditions within one package. The device can run from single or dual supplies, making it adaptable to circuits that use positive-only rails or split rails. Because its outputs are open collector, the interface stage must include pull-up resistors, and system timing must account for the selected variant’s propagation delay.
موصى به
بيانات مرجعية هندسية لـ LM339DBRE4 — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | LM339BDBR | LM2901BDBR | LM239DBR | LM139DBR | LM339B |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-SSOP (DB) | 14-SSOP (DB) | 14-SSOP (DB) | 14-SSOP (DB) | 14-SSOP (DB) | 14-SSOP (DB) |
| Comparator Channels | 4 | 4 | 4 | 4 | 4 | 4 |
| Output Type | Open collector | Open collector | Open collector | Open collector | Open collector | Open collector |
| Total Supply Voltage Range | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V | 2 V to 36 V |
| Differential Input Voltage Range | -38 V to +38 V | -38 V to +38 V | -38 V to +38 V | -38 V to +38 V | -38 V to +38 V | -38 V to +38 V |
أبرز الفروقات
- New designs can use the improved B-version electrical characteristics (مقابلLM339BDBR)
- A wider temperature-grade option is available in the same pin-compatible family (مقابلLM2901BDBR)
- Four channels consolidate multiple comparator decisions (مقابلLM339B)
ملاحظات التصميم
Place each output pull-up resistor close to its associated LM339DBRE4 output pin. This minimizes the trace length carrying switched current and reduces susceptibility to coupling from adjacent high-current paths. Route the two inputs of each comparator together where practical, keep them away from switch-node copper and inductors, and provide a quiet ground-return path. The four channels are independent, so each channel should have its own local input routing and decoupling strategy.
The LM339DBRE4 can operate from a single supply or split supplies, but the total span across the supply pins must remain within the stated 2 V to 36 V range. Do not interpret the ±38 V differential input capability as permission to exceed the absolute supply ratings. Add supply bypassing close to the device and size protection networks for long external inputs. Open-collector outputs require a pull-up voltage that remains within the connected interface’s allowed range.
Do not connect a logic load directly to an open-collector output without a pull-up resistor. The output can sink current but cannot source the logic-high state. Multiple open-collector outputs may be tied to a common pull-up for wired-AND behavior, yet every output and the aggregate pull-up current must remain within the device’s sink-current limit. Also avoid assuming that two LM339-family devices are interchangeable without checking temperature grade, common-mode limits, offset, and propagation delay.
معلومات الامتثال
The cited product information does not state the requested compliance results. Confirm current environmental, material, and automotive qualification status with the manufacturer before production release.
