ISL3172EIUZ-T - ±15kV ESD, 3.3V RS-485/422 Transceiver | Renesas
料号： ISL3172EIUZ-T ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.42 | $2.42 |
| 10 | $2.18 | $21.80 |
| 100 | $1.85 | $185.00 |
| 500 | $1.62 | $810.00 |
| 1,000 | $1.45 | $1,450.00 |
ISL3172EIUZ-T 概述
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.
直接替换替代料： ISL3172EIUZ-T ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ISL3172EIUZ-T （相同外形与封装尺寸） ——差异在于 Package, Unit Load.
快速对比工具——选择替代料号进行并排对比：
ISL3172EIUZ
✅ 直接替换✓ 有现货
$0.95 / 个
查看数据手册 →ISL3176EIUZ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ISL3177EIUZ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ISL3152EIUZ
✅ 直接替换📋 参考替代料（不在目录中）
MAX3483AEASA+
✅ 直接替换📋 参考替代料（不在目录中）
SN65HVD10DR
✅ 直接替换📋 参考替代料（不在目录中）
ISL3172EIUZ-T 规格参数
| 功能 | 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 |
| 工作温度 | -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) |
| 封装 | 8-MSOP (UZ) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead-Free / Halogen-Free | Yes (per Renesas product page) |
ISL3172EIUZ-T 引脚配置
| 引脚 1 | RO — Receiver Output (logic-level UART data output) |
| 引脚 2 | RE# — Receiver Enable (active-low; tie to GND to enable receiver) |
| 引脚 3 | DE — Driver Enable (active-high; tie high or to MCU GPIO) |
| 引脚 4 | DI — Driver Input (logic-level UART data input) |
| 引脚 5 | GND — Ground reference |
| 引脚 6 | A — Non-inverting differential bus pin |
| 引脚 7 | B — Inverting differential bus pin |
| 引脚 8 | VCC — 3.0V to 3.6V supply input |
典型应用
ISL3172EIUZ-T 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： ISL3172EIUZ-T ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- ±15 kV HBM ESD vs ±2 kV typical on legacy parts （对比 MAX3483AEASA+)
- True 1/8 unit load supporting 256 nodes （对比 MAX3483AEASA+)
- Same-footprint drop-in upgrade path to 20 Mbps （对比 ISL3176EIUZ)
设计说明
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.
合规信息
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.
