PS2501-1-A - 5000Vrms Optocoupler, NPN Photo Transistor, DIP-4 | Renesas
Артикул: PS2501-1-A ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $0.55 | $0,55 |
| 10 | $0.49 | $4,90 |
| 100 | $0.42 | $42,00 |
| 500 | $0.36 | $180,00 |
| 1.000 | $0.31 | $310,00 |
PS2501-1-A Обзор
A photocoupler (also called an optoisolator) is a semiconductor device that transfers electrical signals between two isolated circuits using an internal optical path. Phototransistor-output optocouplers like the PS2501-1-A belong to the optocoupler family, which is a subset of isolation ICs and ultimately of interface ICs. They provide galvanic isolation - blocking high voltages, transients, and ground loops while allowing low-speed logic-level signal transfer. Compared to alternative isolation technologies (transformer isolation, digital isolators), optocouplers offer the lowest cost and longest field-proven track record for switching and DC signal isolation below about 1 MHz.
Key features of the PS2501-1-A include 5000 Vrms isolation voltage, 80 V collector-emitter breakdown voltage, 50 mA collector current, -55 to +100 C operating temperature range, and a GaAs LED input that operates at 1.2 V typical forward voltage at 10 mA. The device is designed for AC-DC line voltage sensing and is widely used where robust isolation in a compact DIP footprint is required. The black plastic molded body has UL94-V0 flammability rating.
The PS2501-1-A uses a GaAs infrared LED input stage and a silicon NPN phototransistor output stage separated by a transparent insulating film. Light emitted by the LED when forward-biased passes through the isolation barrier and strikes the phototransistor base, generating a collector current proportional to the LED forward current. This optical coupling eliminates electrical conduction paths between the two sides while preserving linear signal transfer up to several hundred kHz.
Typical applications include switching power supply feedback loops, programmable logic controller (PLC) input/output isolation, AC line voltage sensing, microcontroller digital input isolation, and ground-loop elimination in industrial automation equipment. The DIP-4 package allows easy hand-soldering and breadboard prototyping while still offering industry-standard pin spacing.
When designing with the PS2501-1-A, ensure the input-side IF current is sized within the safe operating area, and add a 100 kohm base-to-emitter resistor on the output transistor to improve switching speed and reduce noise. For high-noise industrial environments, a CTR buffer (e.g., operating at 50% of the minimum CTR) provides margin against aging and temperature drift.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Аналоги без доработки для PS2501-1-A — 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 PS2501-1-A (тот же форм-фактор и посадочное место) — отличается по Isolation Voltage, Mounting Type, Output Type, Package, RoHS Status.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
PS2501A-1-A
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
PS2501-4-A
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
KPC817
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LTV-817S-TA1-C
✅ Прямая замена✓ В наличии
$0.03 / шт.
Открыть даташит →TLP817
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
PC817
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
PS2501-1-A Максимальные параметры и электрические характеристики
| Isolation Voltage | 5000 Vrms |
| Каналы | 1 |
| Тип выхода | Transistor (NPN) |
| Input Forward Voltage | 1.2 V typical at 10 mA |
| Напряжение коллектор-эмиттер (Vceo) | 80 V |
| Emitter-Collector Voltage (VECO) | 7 V |
| Collector Current | 50 mA maximum |
| Current Transfer Ratio (CTR) | 80% to 600% at IF=5 mA, VCE=5 V |
| Рабочая температура | -55 C to +100 C |
| Корпус | 4-DIP through-hole |
| Lead Pitch | 2.54 mm (0.1 inch) |
| Тип монтажа | Through Hole |
| Статус RoHS | Compliant |
| UL Flammability Rating | UL94-V0 |
Конфигурация выводов PS2501-1-A
| Контакт 1 | Anode — LED anode (input side) |
| Контакт 2 | Cathode — LED cathode (input side) |
| Контакт 3 | Emitter — Phototransistor emitter (output side) |
| Контакт 4 | Collector — Phototransistor collector (output side) |
Типичное применение
PS2501-1-A подходит для 6 применениеs: Switching Power Supply Primary-to-Secondary Feedback, PLC Digital Input Isolation, AC Line Voltage Sensing, Microcontroller GPIO Isolation, Industrial Sensor Signal Isolation, Battery Management System Isolation.
Switching Power Supply Primary-to-Secondary Feedback
The PS2501-1-A is widely used to provide isolated feedback in AC-DC and DC-DC switching power supplies, where the TL431 + optocoupler combo regulates the secondary-side output voltage back to the primary-side PWM controller. With 5000 Vrms isolation and 80-600% CTR, the PS2501-1-A cleanly crosses the primary-secondary isolation barrier while maintaining stable loop bandwidth. Designers typically place the LED in series with the TL431 on the secondary and the phototransistor on the primary, with a 100k ohm base-emitter resistor to improve switching speed. The DIP-4 package allows easy hand-soldering during prototype bring-up.
Рекомендуется
PLC Digital Input Isolation
In Programmable Logic Controller (PLC) digital input modules, the PS2501-1-A isolates the 24V field-side input from the 5V or 3.3V logic-side MCU. The 5000 Vrms isolation protects the controller from field-side transients, ESD, and ground loops. The PS2501-1-A's 50 mA collector current is more than sufficient for driving a logic-level CMOS input directly when configured with an appropriate base resistor. The wide -55 to +100 C operating temperature range covers industrial control cabinet environments.
Рекомендуется
AC Line Voltage Sensing
The PS2501-1-A is used to safely sense the presence of AC line voltage in white goods, motor controls, and smart switches. The high 5000 Vrms isolation allows the input LED side to be tied directly to the rectified mains while the output phototransistor sits on the low-voltage MCU side. The GaAs LED's wide forward voltage tolerance (1.0-1.4 V typical) makes it easy to drive from a current source. Designers should add a series resistor to limit the LED current to about 5-10 mA peak when sensing 120V or 240V rectified mains.
Рекомендуется
Microcontroller GPIO Isolation
The PS2501-1-A provides bidirectional isolation for serial communication lines (UART, SPI) between two MCUs operating at different ground potentials. With 80 V collector-emitter breakdown voltage and 5000 Vrms isolation, the PS2501-1-A can handle serial data rates up to several hundred kHz. Designers typically add a base-emitter resistor to reduce turn-off delay, and the CTR can be tuned by adjusting the series resistor on the LED side. The DIP-4 package is convenient for breadboard prototyping of isolated UART bridges.
Рекомендуется
Industrial Sensor Signal Isolation
The PS2501-1-A is used to isolate analog and digital signals from industrial sensors - such as proximity switches, photoelectric sensors, and encoders - that operate near motors, drives, and high-voltage equipment. The 5000 Vrms isolation blocks common-mode noise and ground loops while the high CTR supports linear signal transfer. The PS2501-1-A's wide operating temperature range covers factory-floor environments and outdoor enclosures. The 4-DIP package allows easy replacement and field servicing.
Рекомендуется
Battery Management System Isolation
In Battery Management Systems (BMS) for high-voltage lithium-ion packs (e.g., electric vehicles, e-bikes, energy storage), the PS2501-1-A isolates the cell-monitoring MCU from the high-voltage battery stack. The 5000 Vrms isolation provides the necessary safety barrier for 400V and 800V battery packs. The PS2501-1-A's low LED forward voltage (1.2 V typical at 10 mA) minimizes current draw from the isolated supply. Multiple PS2501-1-A channels can be used to monitor individual cell voltages with galvanic isolation.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для PS2501-1-A — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | PS2501A-1-A | KPC817 | LTV-817 | TLP817 | PC817 |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Vishay Intertechnology | Lite-On | Toshiba | Sharp |
| Package | 4-DIP | 4-DIP - same | 4-DIP - same | 4-DIP - same | 4-DIP - same | 4-DIP - same |
| Isolation Voltage | 5000 Vrms | 5000 Vrms | 5300 Vrms | 5000 Vrms | 5000 Vrms | 5300 Vrms |
| CTR Range | 80% to 600% | 80% to 600% | 50% to 600% | 50% to 600% | 50% to 600% | 50% to 600% |
| VCEO | 80 V | 80 V | 80 V | 80 V | 80 V | 80 V |
| Collector Current (max) | 50 mA | 50 mA | 50 mA | 50 mA | 50 mA | 50 mA |
| Operating Temperature | -55 C to +100 C | -55 C to +100 C | -55 C to +110 C | -30 C to +100 C | -55 C to +100 C | -30 C to +100 C |
| RoHS Compliance | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Ключевые отличия
- Single-vendor Renesas sourcing advantage (против KPC817 (Vishay) / PC817 (Sharp))
- Tighter minimum CTR specification (против KPC817, LTV-817, TLP817, PC817)
- Wide operating temperature range (против LTV-817, PC817)
Заметки по проектированию
Always design with a CTR de-rating factor - operate the LED at the current that yields at least 50% of the minimum CTR to compensate for LED aging (typical degradation 20% over 10 years), temperature drift, and component-to-component variation. For the PS2501-1-A's 80% minimum CTR, drive the LED at IF=10 mA or higher to ensure reliable switching at the 50% CTR de-rated minimum. Adding a 100k ohm base-emitter resistor on the output transistor improves switching speed and reduces noise pickup.
The PS2501-1-A's maximum operating temperature is +100 C. At temperatures above 75 C, CTR drops by approximately 0.5% per C, so designs in enclosed industrial cabinets should leave thermal margin. The DIP-4 package has limited thermal dissipation - avoid placing it near heat sources such as transformers or power resistors. Estimated: assuming 1 mW LED power and 5 mW transistor power, junction temperature rise is below 1 C/W, well within the -55 to +100 C window.
Maintain at least 8 mm clearance between the input-side and output-side copper traces on the PCB to preserve the 5000 Vrms isolation rating. For through-hole DIP-4, route input traces on one side of the package and output traces on the opposite side. Do not run input and output traces parallel under the package. Avoid placing any copper or solder mask under the package body that could compromise the isolation barrier. For surface-mount applications, choose the PS2501L-1 (Gullwing lead-bending) variant instead of the PS2501-1 (DIP).
The PS2501-1-A's switching speed is limited by the phototransistor's rise and fall time, typically 4-10 us, making it suitable for signals up to about 100 kHz. For higher-speed applications (above 1 MHz), use a logic-output optocoupler or a digital isolator. Add a small capacitor (10-100 pF) from the phototransistor collector to ground to filter high-frequency noise. When driving the LED from a logic gate, use a CMOS gate (not TTL) to ensure low saturation voltage and adequate LED current.
Информация о соответствии
RoHS compliant per Renesas product page. AEC-Q100 not applicable (industrial/commercial part, not automotive qualified). UL94-V0 flammability rating per datasheet.
