LM339ADG4 - Quad Differential Comparator | Texas Instruments
MPN: LM339ADG4 ✓ فعالLM339ADG4 نمای کلی
A differential comparator is an analog integrated circuit that evaluates the relationship between two input voltages rather than operating as a conventional high-gain amplifier. If the non-inverting input is higher than the inverting input, the associated output transistor turns on; reversing the inputs changes the output state. The LM339 belongs to the comparator IC, analog comparator, and general-purpose semiconductor hierarchy used for threshold detection, level sensing, waveform conversion, and control decisions.
The four open-collector outputs can sink current but require an external pull-up resistor to establish a high output voltage. This arrangement supports wired logic, relay or lamp drive, and interfacing with TTL, MOS, and CMOS circuits. The manufacturer identifies the device as a standard general-purpose comparator, while the listed 300 ns response time and 0.8 mA typical supply-current drain make it appropriate for circuits where propagation delay and supply demand are more important than nanosecond-class response.
The wide 2 V to 36 V supply range supports industrial control, automotive-style interface circuits, power-supply monitoring, and legacy logic designs. A differential input range equal to the maximum-rated supply voltage allows substantial input swing around ground when suitable supply arrangements are used. The open-collector architecture is particularly useful when multiple comparator channels must share a pull-up or when the output must drive a device requiring more current than the comparator can source directly.
Designers should pay close attention to common-mode input limits, output pull-up values, and the distinction between single- and dual-supply operation. Because the outputs are open collector, leaving them without a pull-up can produce an undefined logic level. Inputs and outputs should also be checked against the electrical limits in the manufacturer datasheet when operating near the 36 V maximum supply.
This page brings together the verified LM339ADG4 specifications, package details, application guidance, same-footprint alternatives, and practical selection considerations. It is intended to help engineers confirm compatibility quickly while retaining the datasheet as the authoritative source for absolute maximum ratings, test conditions, and detailed timing behavior.
جایگزین‌های drop-in برای LM339ADG4 — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای LM339ADG4 (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Package, Comparator Type, Logic Compatibility, Output Type, Number of Channels.
LM339ADRG4
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←LM339DR2G
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←LM339DR
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←LM339DG
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←LM2904PW
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←LM339ADG4 حداکثر مقادیر مجاز و مشخصات الکتریکی
| Comparator Type | General-purpose differential comparator |
| Number of Channels | 4 channels |
| Supply Voltage Range | 2 V to 36 V |
| Propagation Delay | 300 ns |
| نوع خروجی | Open-collector |
| Typical Supply-Current Drain | 0.8 mA |
| Differential Input Voltage Range | Equal to maximum-rated supply voltage, up to ±38 V |
| Common-Mode Input Voltage Range | Includes ground |
| Operating Supply Configurations | Single supply or dual supplies |
| Logic Compatibility | TTL, MOS, and CMOS output compatible |
| بسته‌بندی | 14-SOIC, 3.90 mm width |
| نوع نصب | Surface mount |
| تعداد پایه | 14 pins |
راهنمای پیکربندی پین LM339ADG4 14-soic, 3.90 mm width
پیکربندی پین برای LM339ADG4 (پکیج 14-soic, 3.90 mm width). این قطعه آنالوگ دارای پین‌های ورودی، خروجی و تغذیه است. برای پیکربندی‌های پین offset null، جبران‌سازی و فعال‌سازی به دیتاشیت سازنده مراجعه کنید. ایده‌آل برای مدارهای شرطی‌سازی سیگنال و تقویت‌کننده.
داده پین‌آوت تفصیلی موجود نیست برای LM339ADG4.
به دیتاشیت برای پیکربندی کامل پین‌ها.
کاربردهای معمول
LM339ADG4 مناسب است برای 6 کاربردs: Industrial Threshold Detection, Power-Supply Monitoring, Window and Level Comparators, Relay and Lamp Drive, Sensor Signal Conditioning, Battery and Automotive Interface Logic.
Industrial Threshold Detection
The LM339ADG4 fits industrial threshold-detection circuits because four independent channels can compare sensor signals against separate reference voltages within one 14-SOIC device. Its 2 V to 36 V supply range supports common industrial rails, while the 300 ns propagation delay provides rapid switching for relay, interlock, and alarm decisions. Each open-collector output can directly sink current into a suitable load or pull-up network. The circuit designer should choose resistor values for the pull-up and input network based on leakage, noise, and the required logic level. Input common-mode limits and the operating-temperature grade must also remain inside the manufacturer specifications for the installed enclosure.
پیشنهادی
Power-Supply Monitoring
The LM339ADG4 can monitor multiple power rails by comparing divided feedback voltages from each rail against a common reference. Its 2 V to 36 V operating range accommodates industrial and automotive-style supply buses, and the 300 ns response time allows a protection signal to change quickly when a monitored level crosses a threshold. Because all four comparators share supply pins, their reference and input networks should be scaled to avoid unwanted common-mode excursions. The open-collector outputs can pull down a system fault line or drive an external transistor when a pull-up resistor is added. Final thresholds must include resistor tolerance and the comparator's input-offset characteristics.
پیشنهادی
Window and Level Comparators
The LM339ADG4 is suitable for upper and lower window comparisons because each channel provides an independent differential input pair and an open-collector decision output. A monitored voltage can be compared with upper and lower thresholds to establish whether it remains inside an allowed band. Its 300 ns listed response time supports fast threshold transitions, while the 14-SOIC package consolidates four channels into a compact circuit. Use suitable pull-up resistors on the outputs and account for input-offset voltage when the thresholds are closely spaced. For noisy industrial signals, add filtering at the inputs without adding enough delay to undermine the intended protection response.
پیشنهادی
Relay and Lamp Drive
The LM339ADG4 can form the decision stage of relay, lamp, and solenoid-driver circuits because its open-collector output sinks current when a comparison condition is met. The 2 V to 36 V supply range supports a variety of control systems, and four channels allow several loads to be sequenced or independently switched. An external relay driver or power transistor is normally required because the open-collector output is not a general-purpose source. The pull-up resistor, output current, load flyback path, and comparator common-mode limits must be designed together. Keep inductive switching energy away from input nodes to prevent false decisions or output reset events.
پیشنهادی
Sensor Signal Conditioning
The LM339ADG4 can convert a conditioned sensor signal into a clean logic decision for a controller or data-acquisition system. A sensor output is first scaled into the comparator's input range, then compared with a stable threshold; the open-collector result can drive a pull-up or wired interface. The 300 ns propagation delay is suitable for many sensing loops, while the four-channel arrangement supports temperature, pressure, light, or level inputs within one package. Use the manufacturer common-mode range as a hard design boundary, especially around ground. Add hysteresis or filtering when the monitored signal crosses its threshold slowly and noise could cause repeated output transitions.
پیشنهادی
Battery and Automotive Interface Logic
The LM339ADG4 is useful for battery-powered and automotive interface logic where a wide supply range and open-collector outputs simplify system integration. Four channels can evaluate charge thresholds, battery-present signals, reverse-polarity indications, or discrete sensor states, with a 300 ns response time supporting quick control decisions. Its differential structure helps reject signals referenced to a common bias, while the open-collector output can interface with a pull-up or drive an external transistor. Automotive production designs should verify temperature grade, transient immunity, input limits, and any AEC-Q100 qualification before deployment rather than relying only on the general-purpose family description.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای LM339ADG4 — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | LM339ADRG4 | LM339DR2G | LM339DR | LM339DG | LM2904PW |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-SOIC | 14-SOIC - same package | 14-SOIC - same package | 14-SOIC - same package | 14-SOIC - same package | 14-SOIC - same package |
تفاوت‌های کلیدی
- Four general-purpose channels in one 14-SOIC package (در مقابلLM2904PW)
- Lower minimum single-supply rating in the identified comparison (در مقابلLM339DR2G)
- Direct same-family ordering option with the same footprint (در مقابلLM339ADRG4)
یادداشت‌های طراحی
Fit a pull-up resistor on every open-collector output that must resolve to a valid high state. The output transistor sinks current but does not source the supply voltage. Select the resistor against the load's leakage and sink-current requirements, and verify that the resulting rise time is acceptable for the connected logic. Leaving the outputs without pull-ups is a frequent cause of undefined system states.
Keep comparator input and output routing away from noisy switching nodes and the inductive return path of relays, motors, or lamps. Place any threshold-setting or filtering components close to the corresponding inputs, and route each channel as a compact loop over the 14-SOIC. The open-collector output may switch quickly, so minimizing loop area reduces susceptibility to coupling and false comparator transitions.
Check the actual supply and input levels against the manufacturer limits before enabling the circuit. The LM339 family supports a wide 2 V to 36 V operating range, but the permitted common-mode range is a separate constraint. A supply within its operating range does not automatically make every input voltage legal. Include resistor tolerance, input offset, and startup behavior when defining protection or switching thresholds.
Do not substitute an LM339-family suffix solely because it uses a 14-SOIC footprint. LM339ADG4, LM339DR2G, LM339DR, and LM339DG can differ by ordering suffix, supply limits, temperature grade, or qualification. Compare the electrical-characteristics table and absolute-maximum-rating table for the exact proposed part. For LM2904PW, also confirm common-mode range, offset voltage, output behavior, and environmental ratings.
اطلاعات انطباق
Compliance status requires confirmation from the current Texas Instruments product documentation or the manufacturer's declarations.