ISL3172EIUZ - 3.3V RS-485/RS-422 Transceiver, 1/8 Unit Load | Renesas
Артикул: ISL3172EIUZ ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $1.84 | $1,84 |
| 10 | $1.65 | $16,50 |
| 100 | $1.32 | $132,00 |
| 500 | $1.12 | $560,00 |
| 1.000 | $0.95 | $950,00 |
ISL3172EIUZ Обзор
An RS-485/RS-422 transceiver is a line driver/receiver IC that converts logic-level UART or GPIO signals into the differential voltage levels required for robust, long-distance, noise-immune serial communication over twisted-pair cabling. Within the broader hierarchy, the ISL3172EIUZ sits under Interface ICs > RS-485/RS-422 Transceivers > Differential Transceivers > Power Management and Signal Conditioning chain, serving as the physical-layer bridge between a microcontroller UART and the differential bus.
Key differentiating features include ±15kV ESD protection on the bus pins per the IEC 61000-4-2 contact-discharge model, true 1/8 unit loading for fan-out-intensive multipoint networks, full fail-safe receiver design guaranteeing a logic-high output when the bus is floating, shorted, or idle-terminated, and selectable data rates optimized for either high-speed or slew-rate-limited operation to minimize EMI in motor and process-control cabling. The low quiescent current and 3V-to-3.6V single-supply operation simplify interfacing with 3.3V MCUs without level shifters.
Internally the device uses a differential line driver with slew-rate control and a precision differential receiver with hysteresis. The fail-safe architecture combines open-circuit, shorted-bus, and idle-bus detection so that a noise pulse on an idle line cannot corrupt the UART's RX input, a common field-installation failure mode in industrial RS-485 links.
Typical applications include factory-floor PLC networks, building-automation daisy chains, long-run utility metering busses, point-of-sale terminal interconnects, and any industrial or instrumentation design where 256-node multipoint RS-485 networking is required. The MSOP-8 footprint also suits space-limited embedded designs.
A primary design consideration is bus termination: place a 120 Ω resistor across each cable end only, never mid-bus, and use fail-safe biasing at one location. For EMI, choose the slew-rate-limited variant for cables longer than 10 m to keep rise times inside the RS-485 30%-to-70% duty-cycle specification.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical EMC/fail-safe design notes not consolidated on the manufacturer datasheet alone.
Аналоги без доработки для ISL3172EIUZ — 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 ISL3172EIUZ (тот же форм-фактор и посадочное место) — отличается по Package, Unit Load.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
ISL3172EIUZ-T
✅ Прямая замена✓ В наличии
$1.45 / шт.
Открыть даташит →ISL3178EIUZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ISL3177EIUZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ISL3152EIUZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SN65HVD72DR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX3483ESA
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ISL3172EIUZ Характеристики
| Функция | Transceiver |
| Protocol | RS-422, RS-485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Half |
| Напряжение питания | 3 V to 3.6 V |
| ESD Protection (Bus pins) | ±15 kV IEC 61000-4-2 contact |
| Unit Load | 1/8 unit load |
| Maximum Nodes on Bus | 256 transceivers |
| Bus Current | +125 µA / -100 µA (1/8 load) |
| Fail-Safe | Full fail-safe (open/short/idle) |
| Корпус | 8-pin MSOP |
| Тип монтажа | Surface Mount |
| Lead Free / RoHS | Yes (RoHS compliant) |
| Число выводов | 8 |
Конфигурация выводов ISL3172EIUZ
| Контакт 1 | RO — Receiver output (logic-level to UART RX) |
| Контакт 2 | RE — Receiver enable, active-low (tie low for normal operation) |
| Контакт 3 | DE — Driver enable, active-high (tie high to transmit) |
| Контакт 4 | DI — Driver input (logic-level from UART TX) |
| Контакт 5 | GND — Ground |
| Контакт 6 | A/Y — Non-inverting differential bus I/O |
| Контакт 7 | B/Z — Inverting differential bus I/O |
| Контакт 8 | VCC — 3.3V supply (3.0V to 3.6V) |
Типичное применение
ISL3172EIUZ подходит для 7 применениеs: Industrial RS-485 Multipoint Networks, Building Automation and HVAC Busses, Utility Metering and Smart Grid Networks, Point-of-Sale Terminal Interconnects, Motor Drive and Process-Control Cabling, Solar Inverter and Renewable Energy Monitoring, Security and Access Control Panels.
Industrial RS-485 Multipoint Networks
The ISL3172EIUZ's 1/8 unit loading (125 µA/-100 µA bus current) supports up to 256 transceivers on a single twisted-pair bus per the RS-485 fan-out specification, while ±15kV IEC 61000-4-2 contact ESD on the bus pins protects against field-installation transients on factory floors. The full fail-safe receiver eliminates the corrupted-UART-start-bit problem when lines are open, shorted, or improperly terminated - critical for always-on PLC daisy chains. Placed at each PLC node with 120 Ω end-of-line termination, the IC maintains signal integrity across cable runs of 1200 m at low data rates. Unlike larger-unit-load transceivers, the ISL3172EIUZ avoids the 32-node ceiling that constrains legacy designs.
Рекомендуется
Building Automation and HVAC Busses
Building-automation systems such as BACnet MS-TP and Modbus RTU over RS-485 use dense node counts of thermostats, VAV controllers, and AHU nodes - exactly the topology the ISL3172EIUZ targets with its 256-node 1/8 unit-load fan-out. The 3V-to-3.6V single supply integrates directly with 3.3V HVAC controller MCUs without level shifters, while the full fail-safe receiver prevents nuisance UART framing errors during HVAC seasonal startup when bus segments may be partially disconnected. The MSOP-8 footprint suits space-constrained wall-mount thermostat enclosures. Compared to MAX485 1-unit-load parts, the ISL3172EIUZ multiplies node density eightfold, reducing the need for RS-485 repeaters in large commercial buildings.
Рекомендуется
Utility Metering and Smart Grid Networks
Electricity, water, and gas AMI (Advanced Metering Infrastructure) networks use dense multipoint RS-485 to backhaul data from concentrators to utility endpoints. The ISL3172EIUZ suits this with its 1/8 unit load enabling hundreds of meters per bus segment, its low quiescent current supporting battery-backed endpoints, and its ±15kV IEC ESD surviving field-cable transients from nearby lightning or switching surges. The 3.3V operation aligns with battery-friendly AMI endpoints, and the half-duplex topology matches utility metering's shared-bus protocol. Against 1-unit-load parts, the ISL3172EIUZ's 1/8 loading cuts bus-driver headroom requirements and extends cable reach at the same node count.
Рекомендуется
Point-of-Sale Terminal Interconnects
Retail POS systems use RS-485 to chain checkout terminals, receipt printers, and barcode scanners in long cable runs from the back office to the front desk. The ISL3172EIUZ's ±15kV IEC ESD protects against ESD events from frequent cable swapping by cashiers, while its full fail-safe receiver ensures clean UART framing even when printers are powered off mid-shift. The 3.3V supply aligns with modern POS terminal SoCs that have eliminated 5V rails. With MSOP-8 footprint, the IC fits inside the slim enclosures of pole-mounted POS displays. Compared to discrete RS-485 front-ends, the ISL3172EIUZ integrates DE/RE control and fail-safe biasing in one IC, shrinking the BOM.
Рекомендуется
Motor Drive and Process-Control Cabling
Motor drives, variable-frequency drives, and process-control instrumentation generate substantial EMI on long motor and sensor cables, requiring RS-485 transceivers with slew-rate-limited edges to keep emissions inside IEC 61000-6-4 industrial emission limits. The ISL3172E family variants, including the ISL3172EIUZ, offer slew-rate-limited options that reduce harmonic content on the bus signal, while ±15kV ESD protects against the high-voltage transients that motor-cable crosstalk can couple into the data bus. The half-duplex topology matches the typical Modbus RTU request/reply model used by motor drives. Versus high-speed-only RS-485 parts, the ISL3172EIUZ's slew control eliminates the need for additional cable ferrite filtering.
Рекомендуется
Solar Inverter and Renewable Energy Monitoring
Solar inverters, battery management systems, and wind-turbine controllers use RS-485 to daisy-chain string-monitoring modules and remote I/O over long cable runs in outdoor enclosures exposed to ESD events. The ISL3172EIUZ's ±15kV IEC 61000-4-2 contact ESD and 1/8 unit loading suit these fan-out-dense, transient-prone installations. The 3.3V supply aligns with the low-power MCUs used in solar string monitors, and the half-duplex topology matches Modbus RTU over RS-485 used by most inverter OEMs. Compared to non-ESD-hardened RS-485 transceivers, the ISL3172EIUZ eliminates external TVS diode arrays on the bus, reducing BOM cost and PCB area.
Рекомендуется
Security and Access Control Panels
Access control panels use RS-485 to chain card readers, door controllers, and alarm sensors across commercial buildings, requiring high node counts on a single cable run. The ISL3172EIUZ's 256-node 1/8 unit-load capability suits multi-door installations in offices, hospitals, and hotels, while the ±15kV ESD rating protects against cable handling transients during installation and maintenance. The full fail-safe receiver prevents the access-control host from misinterpreting bus noise as valid card reads when segments are disconnected during commissioning. The MSOP-8 footprint suits the slim enclosures of door-mounted reader controllers. Compared to 1-unit-load parts, the ISL3172EIUZ scales eight times more doors per controller.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ISL3172EIUZ — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ISL3172EIUZ-T | ISL3178EIUZ | ISL3177EIUZ | SN65HVD72DR | MAX3483ESA |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Texas Instruments | Analog Devices |
| Package | MSOP-8 | MSOP-8 - same | MSOP-8 - same | MSOP-8 - same | MSOP-8 (DGK) - same | MSOP-8/SOIC-8 - same |
| Supply Voltage | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V |
| Unit Load | 1/8 unit load | 1/8 unit load | 1/8 unit load | 1/8 unit load | 1/8 unit load | 1/8 unit load |
| Maximum Bus Nodes | 256 | 256 | 256 | 256 | 256 | 256 |
| ESD Protection (Bus pins) | ±15 kV IEC 61000-4-2 contact | ±15 kV IEC 61000-4-2 contact | ±15 kV IEC 61000-4-2 contact | ±15 kV IEC 61000-4-2 contact | ±16 kV HBM (lower IEC rating) | ±15 kV HBM (lower IEC rating) |
| Fail-Safe | Full fail-safe (open/short/idle) | Full fail-safe | Full fail-safe | Full fail-safe | Standard fail-safe | Standard fail-safe |
| Duplex | Half | Half | Half | Half | Half | Half |
Ключевые отличия
- 1/8 unit loading enables 256-node multipoint RS-485 networks (против MAX485 (1/1 unit load))
- ±15 kV IEC 61000-4-2 contact ESD protection on bus pins (против MAX3483 (±15 kV HBM only))
- Full fail-safe receiver handles open, shorted, and idle-bus conditions (против SN65HVD72 (standard fail-safe))
- Selectable slew-rate-limited variant available in same MSOP-8 footprint (против SN65HVD72 (fixed edge rate))
Заметки по проектированию
Estimated - bus termination is the single most common field-installation failure: place a 120 Ω termination resistor ONLY at each physical cable end (typically the host and the most-distant node), never mid-bus. Mid-bus termination creates reflections that corrupt UART framing. Use 1% tolerance resistors to maintain the 60 Ω differential bus impedance for RS-485. Fail-safe biasing (typically a divider pulling A high and B low through large-value resistors) should be installed at exactly one location, usually the host, to bias the bus high when all drivers are disabled.
Place the ISL3172EIUZ close to the bus connector and keep the A/Y and B/Z traces short, matched-length, and routed as a differential pair with 100 Ω differential impedance. Use a ground plane under the bus traces for return-path integrity, and place 100 nF decoupling capacitors on VCC (pin 8) within 5 mm of the IC. Series ferrite beads or common-mode chokes on the bus traces help attenuate common-mode noise from motor and switching power supplies, which is the dominant EMI source in industrial installations.
Estimated - maximum cable length at any data rate follows the rule 'cable_length_mbps ≤ 10^10'. At 115 kbps (a common Modbus rate), the ISL3172EIUZ supports up to ~1200 m of cable; at 10 Mbps, only ~100 m is achievable. Choose the slew-rate-limited ISL3172E variants for cables longer than 10 m to keep rise times inside the RS-485 30%-to-70% duty-cycle spec, reducing EMI and reflection-induced jitter. For cables shorter than 1 m, the high-speed variant can be used without concern.
Estimated - the ISL3172EIUZ draws low supply current (sub-mA quiescent, sub-10 mA active per datasheet), but bus currents of ±125 µA flow continuously into the termination network. For battery-powered metering endpoints, use the shutdown mode (when supported) and duty-cycle the receiver to extend battery life. Add a 10 µF bulk capacitor near the IC and a 100 nF high-frequency decoupling cap within 5 mm of VCC to handle transient switching currents during driver state changes.
Информация о соответствии
RoHS compliant and lead-free per Renesas product page and UZ MSOP suffix designation. Material - 20-lead designation confirmed. Not AEC-Q100 qualified - choose ISL3172EIUZ-T7A or an automotive-grade part for vehicle applications. REACH SVHC compliance certificate available from Renesas upon request.
