LM2901N - Quad Open-Collector Comparator | Texas Instruments
Артикул: LM2901N ✓ АктивенLM2901N Обзор
A comparator is a differential amplifier used to evaluate the relationship between two voltages. When the non-inverting input exceeds the inverting input, the associated output transistor turns on; reversing the inputs reverses the output state. The LM2901N belongs to the comparator hierarchy, which includes differential comparator ICs, analog interface ICs, and broader semiconductor signal-conditioning devices. Its four independent channels make it useful when a design requires multiple threshold, level, or sensing decisions.
Important characteristics include a typical input bias current of 25 nA, typical input offset current of ±5.0 nA, and low supply-current consumption. The open-collector architecture is especially useful for wired logic, relay-driving interfaces, and systems that share a pull-up rail. Unlike a push-pull output, an open-collector output requires an external pull-up resistor and can safely combine multiple driver nodes when the device ratings and pull-up design are appropriate.
The four channels share supply and ground pins but have independent inputs and outputs. This arrangement supports simultaneous comparisons, window detection, and complementary decision logic. Because the outputs are open collector, external pull-up resistors determine the high-state voltage and can be tied to TTL-, CMOS-, or MOS-compatible logic levels. The input arrangement permits sensing signals referenced to ground while the supply rail provides the comparator's operating voltage.
Typical applications include industrial level detection, low-level sensing, consumer and automotive threshold decisions, memory and window-comparison circuits, and general-purpose control logic. The LM2901N is particularly appropriate when the design needs several channels, a wide supply range, low input bias current, and flexible output pull-up rather than rail-to-rail push-pull outputs. It is also useful in systems where output transistors must remain off until a wired-AND condition is satisfied.
A key design consideration is the pull-up network. Select its resistance to balance rise time, output-sink current, power consumption, and the number of outputs connected to one node. Also route the four differential input pairs away from noisy supply and switching-current paths, because comparator input offset can determine the actual switching threshold. Confirm output-state behavior, input common-mode limits, and supply sequencing against the manufacturer datasheet before finalizing the circuit.
This product page combines manufacturer information, distributor listings, package details, and practical comparator design guidance. It also identifies same-package alternatives and organizes the technical trade-offs for engineers comparing the LM2901N with other quad differential comparators before making a PCB-compatible sourcing decision.
Аналоги без доработки для LM2901N — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с LM2901N (тот же форм-фактор и посадочное место) — отличается по Comparator Type, Logic Compatibility, Package, Mounting Type, Output Type.
LM2901BN
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LM2901N
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Открыть даташит →LM2901N
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Открыть даташит →LM2901N
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Открыть даташит →LM339AN
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Открыть даташит →LM2901N Максимальные параметры и электрические характеристики
| Comparator Type | Quad differential comparator |
| Number of Channels | 4 channels |
| Supply Configuration | Single or split supply |
| Maximum Supply Voltage | 36 V |
| Input Bias Current | 25 nA typical |
| Input Offset Current | ±5.0 nA typical |
| Supply Current Drain | 800 µA typical |
| Тип выхода | Open collector |
| Logic Compatibility | TTL, DTL, MOS, ECL, and CMOS output compatibility |
| Корпус | 14-pin DIP |
| Тип монтажа | Through hole |
| Рабочая температура | -40 °C to +85 °C |
| Статус RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
Конфигурация выводов LM2901N
| Контакт 1 | OUT 1 — Open-collector output for comparator channel 1 |
| Контакт 2 | IN 1- — Inverting input for comparator channel 1 |
| Контакт 3 | IN 1+ — Non-inverting input for comparator channel 1 |
| Контакт 4 | GND — Ground connection |
| Контакт 5 | IN 2+ — Non-inverting input for comparator channel 2 |
| Контакт 6 | IN 2- — Inverting input for comparator channel 2 |
| Контакт 7 | OUT 2 — Open-collector output for comparator channel 2 |
| Контакт 8 | OUT 3 — Open-collector output for comparator channel 3 |
| Контакт 9 | IN 3- — Inverting input for comparator channel 3 |
| Контакт 10 | IN 3+ — Non-inverting input for comparator channel 3 |
| Контакт 11 | GND — Ground connection |
| Контакт 12 | IN 4+ — Non-inverting input for comparator channel 4 |
| Контакт 13 | IN 4- — Inverting input for comparator channel 4 |
| Контакт 14 | OUT 4 — Open-collector output for comparator channel 4 |
Типичное применение
LM2901N подходит для 6 применениеs: Industrial Level Detection, Automotive Threshold and Fault Detection, Window Comparator and Memory Monitoring, Relay and Actuator Interfacing, Consumer Equipment Control Logic, Low-Level Sensing and Signal Qualification.
Industrial Level Detection
The LM2901N fits industrial level detection because it provides four independent comparator channels, a supply range extending to approximately 36 V, and a typical input bias current of 25 nA. Place the sensed voltage on one input and a threshold reference on the other, then use each open-collector output to drive a pull-up and a controller input. The wide supply range supports systems whose sensors operate above conventional 5 V logic levels. Confirm that the sensor voltage remains within the comparator's specified common-mode range, and select the pull-up voltage and resistance to match the downstream logic. This arrangement is useful for tank, reservoir, or equipment-level indication where several thresholds must be evaluated independently.
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Automotive Threshold and Fault Detection
The LM2901N can support automotive-style threshold and fault-detection functions where several voltages must be compared against independent references. Its four channels share a supply and ground but provide separate outputs, allowing one device to supervise multiple system signals. The open-collector architecture is useful for wired-AND fault signaling with a pull-up resistor. According to the manufacturer information, the LM2901-N family is intended for automotive electronic applications and includes a -40 °C to +85 °C operating-temperature listing. Nevertheless, an automotive production design should confirm device qualification, transient immunity, supply limits, and AEC-Q100 status in the specific manufacturer's documentation rather than infer automotive qualification from the application alone.
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Window Comparator and Memory Monitoring
The LM2901N is well suited to window comparison because two channels can establish upper and lower limits around a controlled signal. The remaining channels can monitor supply rails, status flags, or a memory-related control signal. Texas Instruments describes the family for memory applications, while its four independent comparators reduce the number of separate devices needed for multi-point monitoring. Use resistor dividers to translate the monitored voltage into the comparator input range, and place a pull-up resistor on every open-collector output. The actual switching point will also be affected by input offset voltage, so design the thresholds with adequate separation and verify operation across temperature and supply tolerances.
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Relay and Actuator Interfacing
The LM2901N can serve as the decision stage in relay and actuator interfaces because each open-collector output can sink current from a pull-up network. Place the output in the relay-driver input rather than driving a relay coil directly, and add the required driver transistor, flyback diode, and coil supply according to the driver design. The comparator accepts single- or split-supply operation, allowing it to work with sensors referenced to ground. Use the four channels when the controller must decide whether several interlocks are satisfied before enabling an actuator. Verify output sink current, output saturation voltage, and the external transistor's base current against the manufacturer datasheet.
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Consumer Equipment Control Logic
The LM2901N can implement threshold decisions in consumer equipment where several controls or sensor outputs must be converted into logic states. Its four channels provide independent comparisons, while the open-collector outputs allow direct connection to a pull-up rail when the receiving circuit supports wired logic. The typical 800 µA supply-current figure helps when designing compact control boards, although the complete system budget must include pull-up current and any external drivers. Keep sensitive input traces short and away from relay-coil or switching-supply paths, and check the comparator's input range for every operating mode. A suitable application is a consumer appliance that combines level sensing, set-point comparison, and interlock logic.
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Low-Level Sensing and Signal Qualification
The LM2901N is suitable for low-level sensing when the signal source does not impose excessive loading and the threshold is established with a stable reference. Its typical input bias current of 25 nA limits current drawn from high-impedance sensing nodes, while four channels can qualify several related measurements. Use a low-noise reference and properly routed divider network for the threshold input to avoid shifting the decision point. If the source is bipolar, split-supply operation can support signals around ground, but the signal must remain inside the guaranteed common-mode range. Temperature drift and input offset voltage should be included in the threshold-error budget, particularly when the application distinguishes closely spaced switching levels.
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Сводка рекомендуемых товаров
Справочные инженерные данные для LM2901N — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | LM2901BN | LM2901N | LM2901N | LM2901N | LM339AN |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | STMicroelectronics | onsemi | Motorola, Inc. | Texas Instruments |
| Package | DIP-14 | DIP-14 - same package | 14-DIP - same package | 14-MDIP - same package | DIP-14 - same package | DIP-14 - same package |
| Comparator Configuration | Quad differential comparator | Quad comparator | Quad comparator | Quad comparator | Quad comparator | Quad comparator |
| Output Type | Open collector | Open collector | Open collector | Open collector | Open collector | Open collector |
| Supply Configuration | Single or split supply | Single or split supply | Single or split supply | Single or split supply | Single or split supply | Single or split supply |
Ключевые отличия
- Four independent channels in one through-hole package (против LM2904P3)
- Single- and split-supply flexibility (против LM2901BN)
- Open-collector wired-logic output (против LM339AN)
Заметки по проектированию
Do not treat the open-collector output as a push-pull logic output. Every output node requires an external pull-up resistor, and the resistor's logic rail must remain compatible with both the downstream device and the LM2901N output ratings. When multiple open-collector outputs share one node, confirm that only one output can sink at a time and that the pull-up current remains within every output's allowed condition.
Route each inverting and non-inverting input as a compact differential pair, keep the pair away from switching nodes, and place the pull-up resistor close to the driven logic input. Long input traces can pick up noise that shifts the apparent switching threshold. If a sensing source is high impedance, minimize leakage paths around the input pins and consider guarding or shielding according to the source-impedance requirements.
Calculate the pull-up current as the pull-up voltage divided by its resistance and include that current in the system supply budget. The LM2901N supply-current listing is 800 µA typical for the device family, while pull-up current can dominate when several outputs remain in the low state. Also account for the voltage drop across the open-collector transistor when sizing the receiver's guaranteed logic-low margin.
Информация о соответствии
No explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations were identified for this exact ordering code. Automotive suitability as an application does not by itself establish AEC-Q100 qualification.