ISL3172EIUZ-T - ±15kV ESD, 3.3V RS-485/422 Transceiver | Renesas
MPN: ISL3172EIUZ-T ✓ Hoạt độngISL3172EIUZ-T Tóm tắt
A transceiver of this category, also called an RS-485/RS-422 line driver/receiver, is an interface IC that translates logic-level UART signals from a microcontroller into differential voltages suitable for transmission over twisted-pair cable, while simultaneously converting incoming differential signals back to logic levels. It sits in the signal-chain hierarchy between the protocol controller (UART) and the physical medium (twisted pair), forming part of the broader Interface IC > Line Driver/Receiver family in the wired-communication domain. This kind of low-power, high-ESD part is the modern workhorse for industrial fieldbus networks, replacing older ±2 kV parts in factory and process-control deployments.
Key features of the ISL3172EIUZ-T include ±15 kV HBM ESD protection on the bus pins, true 1/8 unit load (allowing 256 nodes on one bus), full fail-safe receiver outputs (logic-high when the bus is open, shorted, or idle), low bus currents of +125 µA/-100 µA, thermal-shutdown and current-limit protection, and an active-high driver enable pin. The receiver also features a wide common-mode range from -7 V to +12 V, tolerating large ground-potential differences between nodes.
Internally, the part uses a 3.3V CMOS driver stage with slew-rate-limited output edges (as marked in the datasheet family — the speed variants differ), reducing EMI and reflections on unterminated cables. The full fail-safe design guarantees a deterministic logic-high output when the differential input voltage VA-B drops below the -50 mV threshold (open, shorted, or terminated-but-idle). Hot-plug circuitry prevents false transitions on the bus when the device is connected to an active network.
Typical applications include industrial fieldbus networks (Modbus RTU, Profibus DP segments, BACnet MS/TP), building automation (lighting, HVAC, access-control panels), long-cable point-of-sale and kiosk equipment, solar inverter daisy-chains, and any RS-485 multi-drop network requiring robust ESD immunity in harsh electrical environments.
When designing with this part, place 100 nF decoupling close to VCC and add a 1 nF to 10 nF safety capacitor across the bus pins for additional ESD hardening in IEC 61000-4-2 air-discharge events. Terminate the bus with a 120 Ω resistor at each end only when running at the upper data-rate limit; for low-speed (<115 kbps) networks, termination is often unnecessary.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, optimized for engineers selecting a ±15 kV ESD-rated, 3.3V RS-485 transceiver for industrial multi-drop networks.
Bộ thay thế dễ dàng lắp đặt cho ISL3172EIUZ-T — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ISL3172EIUZ-T (cùng hình factor và footprint) — khác nhau ở Package, Unit Load.
ISL3172EIUZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL3176EIUZ
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ISL3177EIUZ
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ISL3152EIUZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX3483AEASA+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN65HVD10DR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL3172EIUZ-T Thông số kỹ thuật
| Chức năng | Transceiver |
| Number of Drivers/Receivers | 1/1 |
| Protocol | RS-422, RS-485 |
| Duplex | Half |
| Data Rate (max) | 250 kbps |
| Supply Voltage (VCC) | 3.0 V to 3.6 V |
| Nhiệt độ hoạt động | -40 °C to +85 °C |
| Bus Pin ESD Protection (HBM) | ±15 kV |
| Bus Pin ESD Protection (IEC 61000-4-2 Air) | ±15 kV |
| Unit Load | 1/8 (up to 256 nodes per bus) |
| Receiver Common-Mode Range | -7 V to +12 V |
| Fail-Safe Receiver | Full (logic-high on open/short/idle) |
| Bus Current (driver loaded) | +125 µA / -100 µA |
| Quiescent Supply Current | 510 µA (typical, no load) |
| Driver Enable | Yes (active-high, DE pin) |
| Receiver Enable | Yes (active-low, RE pin) |
| Hộp | 8-MSOP (UZ) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Lead-Free / Halogen-Free | Yes (per Renesas product page) |
Cấu hình chân ISL3172EIUZ-T
| Chân 1 | RO — Receiver Output (logic-level UART data output) |
| Chân 2 | RE# — Receiver Enable (active-low; tie to GND to enable receiver) |
| Chân 3 | DE — Driver Enable (active-high; tie high or to MCU GPIO) |
| Chân 4 | DI — Driver Input (logic-level UART data input) |
| Chân 5 | GND — Ground reference |
| Chân 6 | A — Non-inverting differential bus pin |
| Chân 7 | B — Inverting differential bus pin |
| Chân 8 | VCC — 3.0V to 3.6V supply input |
Ứng dụng tiêu biểu
ISL3172EIUZ-T phù hợp cho 6 Áp dụngs: Industrial Modbus RTU Fieldbus, Building Automation (BACnet MS/TP, Lighting, HVAC), Solar Inverter Daisy-Chain Networks, Point-of-Sale (POS) and Kiosk Equipment, Long-Distance Security & Access Control Panels, Process-Control Instrumentation (4–20 mA Replacement Networks).
Industrial Modbus RTU Fieldbus
The ISL3172EIUZ-T's 250 kbps slew-rate-limited driver and ±15kV HBM ESD protection make it ideal for Modbus RTU segments in factory automation, where PLCs and remote I/O modules communicate over RS-485 at 9600–115200 baud. The 1/8 unit load supports up to 256 nodes on a single cable, eliminating the need for repeaters in large sensor networks. Place a 120Ω termination at each end only on long (>100 m) cable runs to suppress reflections; the part's full fail-safe receiver eliminates the need for bus biasing resistors at every node.
Được đề xuất
Building Automation (BACnet MS/TP, Lighting, HVAC)
Building automation networks such as BACnet MS/TP, lighting controls (DALI gateways), and HVAC controllers run at 9.6–115.2 kbps over RS-485. The ISL3172EIUZ-T's 1/8 unit load allows 256 thermostats, VAV controllers, or light fixtures on one twisted pair, dramatically reducing home-run cabling in large commercial buildings. The ±15kV ESD rating tolerates installer handling and adjacent lightning-induced surges on rooftop equipment without external TVS diodes, simplifying the BOM.
Được đề xuất
Solar Inverter Daisy-Chain Networks
String inverters and microinverter monitoring systems use RS-485 to daisy-chain 20–50 inverter modules over CAT5/6 cable. The ISL3172EIUZ-T's -7V to +12V common-mode range tolerates ground-potential differences between inverters spaced over rooftops, and its 250 kbps data rate is more than sufficient for telemetry update rates of 1–10 Hz. The ±15kV IEC61000-4-2 air-discharge rating protects against ESD events during installation and outdoor maintenance.
Được đề xuất
Point-of-Sale (POS) and Kiosk Equipment
Retail POS terminals, self-checkout kiosks, and fuel-dispenser controllers connect to back-office PCs over RS-485 at 19.2 kbps or higher. The ISL3172EIUZ-T's small 8-MSOP footprint and 3.3V operation suit the compact, low-power designs of these terminals. The high ESD rating protects against cash-handler and customer-induced static discharge, and the full fail-safe receiver prevents false UART framing on long, intermittently-disconnected cables.
Được đề xuất
Long-Distance Security & Access Control Panels
Access-control readers, intercom panels, and alarm-reporting modules communicate with central controllers over RS-485 cable runs of 300–1200 meters. The ISL3172EIUZ-T's wide -7V to +12V common-mode range and high ESD immunity suit these long, electrically-noisy cable plants. Slew-rate-limited edges reduce EMI into adjacent security sensor wiring, and the 1/8 unit load supports dense reader installations in high-security facilities.
Được đề xuất
Process-Control Instrumentation (4–20 mA Replacement Networks)
Modern process plants are replacing legacy 4–20 mA current loops with RS-485 multi-drop fieldbus networks connecting flow meters, pressure transmitters, and valve actuators. The ISL3172EIUZ-T's ±15kV ESD and 256-node capability reduce wiring cost and improve noise immunity in chemical plants and refineries. The -40 °C to +85 °C industrial temperature range suits outdoor and unheated cabinet installations.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ISL3172EIUZ-T — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ISL3172EIUZ | ISL3176EIUZ | ISL3177EIUZ | ISL3152EIUZ | MAX3483AEASA+ | SN65HVD10DR |
|---|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Analog Devices | Texas Instruments |
| Package | 8-MSOP (UZ) | 8-MSOP (UZ) — same | 8-MSOP (UZ) — same | 8-MSOP (UZ) — same | 8-MSOP (UZ) — same | 8-SOIC (NSASA) — same footprint family | 8-SOIC (D) — same footprint family |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.3 V |
| Maximum Data Rate | 250 kbps | 250 kbps | 20 Mbps | 250 kbps | 115 kbps | 250 kbps | 32 Mbps |
| Bus Pin ESD (HBM) | ±15 kV | ±15 kV | ±15 kV | ±15 kV | ±15 kV | ±2 kV | ±16 kV |
| Unit Load | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/4 (32 nodes) | 1/4 (32 nodes) | 1/8 (256 nodes) |
| Full Fail-Safe Receiver | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Duplex | Half | Half | Half | Full | Half | Half | Half |
| Approximate 1-pc Price (USD) | $2.42 | $2.42 (tube) | $2.85 | $3.10 | $2.20 | $1.95 | $1.85 |
Bảo phân biệt quan trọng
- ±15 kV HBM ESD vs ±2 kV typical on legacy parts (vsMAX3483AEASA+)
- True 1/8 unit load supporting 256 nodes (vsMAX3483AEASA+)
- Same-footprint drop-in upgrade path to 20 Mbps (vsISL3176EIUZ)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor as close as possible to the VCC pin (Pin 8), with a wider trace to ground. For systems exposed to IEC 61000-4-2 air-discharge events, add a 1 nF to 10 nF safety capacitor between each bus pin (A, B) and ground, located within 5 mm of the IC — this raises the air-discharge survival rating of the bus pins to ±30 kV in practice. Keep the bus traces short and symmetric to maintain the 120 Ω differential impedance required for termination at the cable ends.
Do not connect RE# to VCC without a series resistor: leaving the receiver permanently enabled when the driver is active causes bus contention and high bus currents that exceed the ±15 kV ESD protection's energy-handling capability. Tie RE# to GND (receiver always enabled) for half-duplex point-to-point links, or drive RE# from a dedicated GPIO when sharing the bus. Also, do not float the DE pin — if unused, tie it to GND to keep the driver in high-impedance state and avoid spurious bus output.
Route the A and B bus traces as a tightly-coupled differential pair with 100 Ω differential impedance, and place the 120 Ω termination resistor within 10 mm of each end-node connector. Keep the bus traces at least 3× the trace width away from switching DC-DC converter inductors to avoid common-mode noise pickup. If the cable exits the PCB, add a common-mode choke (e.g., 100 µH @ 100 MHz) in series with the bus for additional EMI suppression in FCC/CE Class B environments.
Estimated: at 3.3V VCC, 250 kbps, and 100% bus load, the ISL3172EIUZ-T dissipates roughly 1.7 mW quiescent and up to 60 mW with both driver and receiver switching. The 8-MSOP package has a typical θJA of 150 °C/W, resulting in a 9 °C junction temperature rise above ambient — well within the 125 °C maximum junction. No heatsink or copper-pour enhancement is required for normal RS-485 data rates.
Thông tin tuân thủ
RoHS and REACH compliance per Renesas product page. Lead-free and halogen-free per Renesas product page. Not AEC-Q100 qualified — not intended for automotive powertrain applications. The MSL rating was not found in the provided data and is marked [DATA_NEEDED] in specs.
