ISL32614EFHZ-T - 1.8V RS-485/422 Driver ESD | Renesas
部品番号: ISL32614EFHZ-T ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.31 | $13.10 |
| 100 | $1.12 | $112.00 |
| 500 | $0.98 | $490.00 |
| 1,000 | $0.86 | $860.00 |
ISL32614EFHZ-T 概要
An RS-485/RS-422 transmitter is a differential line driver that converts single-ended logic (TTL/CMOS) signals into a balanced differential pair (Y/Z outputs) for transmission over twisted-pair buses. It sits within the broader hierarchy of interface ICs -> transceivers/drivers -> differential serial communication, governed by the TIA/EIA-485 standard. Because drivers present a defined load to the shared bus, their input impedance determines how many nodes a multi-drop network can support.
The defining feature of the ISL32614E is its very low bus current of +/-40uA, presenting less than 1/8 of a unit load to the bus. This allows more than 256 transmitters on the network without violating the RS-485 specification's 32 unit-load maximum, making it exceptional for large node-count networks. The +/-16.5kV HBM ESD rating on bus pins dramatically improves field reliability in electrically harsh environments.
Operating from a nominal 1.8V rail, the device matches modern low-voltage microcontroller I/O levels directly, removing the need for level shifting or a separate 3.3V/5V supply. The F-grade temperature rating supports -40C to +125C operation for industrial and automotive-adjacent environments. The compact SOT-23-6 (HZ) package minimizes PCB area in dense nodes.
Typical applications include building automation and BACnet MS/TP networks, industrial fieldbus segments, battery-powered telemetry nodes, and long-haul differential links between low-voltage MCUs and remote I/O.
For design, ensure fail-safe biasing resistors on the bus since this part is a driver-only solution - a separate receiver (e.g., ISL32611E) is needed for full-duplex or listen capability.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
ドロップイン代替品: ISL32614EFHZ-T — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
ISL32613EFHZ-T
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ISL32614EFHZ-T7A
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ISL3284EFHZ-T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ISL32614EFHZ-T 仕様
| 機能 | Single differential line driver (transmitter) |
| Protocol | RS-485 / RS-422 |
| Supply Voltage Range | 1.8 V to 3.6 V |
| Number of Drivers / Receivers | 1 / 0 |
| ESD Protection (Bus Pins, HBM) | +/-16.5 kV |
| ESD Protection (IEC61000 Contact) | 7 kV |
| Bus Input Current | +/-40 uA |
| Unit Load | Less than 1/8 unit load |
| Maximum Nodes on Bus | More than 256 transmitters |
| 動作温度範囲 | -40C to +125C |
| パッケージ | SOT-23-6 (HZ) |
| 実装タイプ | Surface Mount |
| Moisture Sensitivity | MSL rated (per manufacturer data) |
| RoHS ステータス | Compliant |
| ライフサイクル状態 | Active |
ISL32614EFHZ-T ピン構成
| ピン 1 | DIN — Driver input (TTL/CMOS logic data in) |
| ピン 2 | GND — Ground |
| ピン 3 | Y — Non-inverting driver output (RS-485 bus) |
| ピン 4 | Z — Inverting driver output (RS-485 bus) |
| ピン 5 | VCC — Power supply, 1.8V to 3.6V |
| ピン 6 | DE — Driver enable (active high) |
主な用途
ISL32614EFHZ-T の用途: 6 件s: Building Automation (BACnet MS/TP), Battery-Powered Telemetry Nodes, Industrial Fieldbus Segments, Low-Voltage MCU to Remote I/O Links, Security and Access Control Networks, Energy Metering and Solar String Monitoring.
Building Automation (BACnet MS/TP)
The ISL32614EFHZ-T fits building automation buses such as BACnet MS/TP and Modbus RTU because large multi-drop networks are the norm: its +/-40uA bus current gives under 1/8 unit load, letting designers exceed 256 driver nodes on one twisted pair without violating the 32 unit-load RS-485 budget. The 1.8V to 3.6V supply matches low-voltage thermostat and sensor MCU I/O directly, while +/-16.5kV HBM and 7kV IEC61000 contact ESD on the bus pins absorb discharge events from long cable runs. Placed between the controller UART TX pin and the Y/Z bus terminals with a 100nF local decoupling capacitor, the driver adds minimal bus loading; the trade-off is that fail-safe biasing resistors must be added externally since this is a driver-only part.
おすすめ
Battery-Powered Telemetry Nodes
For battery-operated meters, loggers, and telemetry endpoints, the ISL32614EFHZ-T's 1.8V to 3.6V supply range allows direct operation from a single-cell Li-SOCl2 or Li-MnO2 rail through a low-Iq LDO, eliminating a boost converter that a 5V RS-485 driver would require. The driver-only architecture means no receiver quiescent draw while transmitting, and the SOT-23-6 package keeps the node PCB under 9mm2 of interface area. Its +/-16.5kV HBM bus-pin ESD rating protects against handling and induced surges in the field, a common failure point for exposed battery-powered assets. Designers should gate the DE pin from an MCU GPIO so the driver tri-states between transmissions, cutting bus loading to +/-40uA and conserving battery capacity across long sleep intervals.
おすすめ
Industrial Fieldbus Segments
On factory floors, RS-485 segments run near motor drives, contactors, and switching supplies, so bus-pin robustness is decisive. The ISL32614EFHZ-T addresses this with +/-16.5kV HBM and 7kV IEC61000 contact ESD protection integrated on the Y/Z outputs, often removing the external TVS diodes that a lesser-rated driver would need. The -40C to +125C F-grade rating suits control cabinets and outdoor junction boxes where ambient swings are severe. Because it is driver-only, it pairs naturally with a companion receiver for full-duplex (4-wire) fieldbus links, letting each direction use the optimal fractional-unit-load device. Add 120-ohm termination at both cable ends and keep the driver within the RS-485 common-mode envelope; its low +/-40uA bus current preserves signal margin for every additional node on the segment.
おすすめ
Low-Voltage MCU to Remote I/O Links
Modern MCUs and SoCs run at 1.8V core and I/O rails, and the ISL32614EFHZ-T is one of the few RS-485 drivers whose 1.8V to 3.6V supply accepts that I/O level directly. This removes dual-supply designs, level-shifter ICs, and the signal-integrity degradation they introduce between the UART and the driver. In a typical link, the MCU TX pin drives DIN, a GPIO drives DE, and the differential pair runs shielded twisted pair to remote I/O modules. The 7kV IEC61000 contact rating on the bus side protects the MCU board when technicians hot-plug cables. Engineers should verify the driver output swing meets the remote receiver's 200mV differential threshold at maximum cable length, which the RS-485-compliant output stage supports on properly terminated 120-ohm pairs.
おすすめ
Security and Access Control Networks
Access control panels, card readers, and door controllers are commonly daisy-chained on RS-485 runs that traverse buildings and accumulate hundreds of meters of cable - exactly the topology where the ISL32614EFHZ-T's 1/8 unit-load rating pays off, since more than 256 driver nodes can share one segment per the datasheet bus-current budget. The +/-16.5kV HBM bus ESD rating withstands static discharge from metal reader housings and long unshielded drops, improving mean time between failures in security installations that demand high availability. Its 1.8V supply compatibility suits modern battery-backed reader controllers. Place a 100nF ceramic capacitor within 2mm of the VCC pin, keep the Y/Z traces short and matched to the cable impedance, and include external fail-safe biasing so the idle bus state stays valid between transmissions.
おすすめ
Energy Metering and Solar String Monitoring
String inverters, energy meters, and solar combiner boxes frequently report over RS-485 multi-drop buses exposed to lightning-induced transients and wide temperature swings. The ISL32614EFHZ-T contributes +/-16.5kV HBM and 7kV IEC61000 contact bus-pin protection, an F-grade -40C to +125C operating range for rooftop and enclosure environments, and a 1.8V to 3.6V supply that runs from the metering SoC's own low-voltage rail. Its under-1/8 unit load permits large fleets of metering nodes on one monitoring segment, simplifying plant-wide SCADA wiring. Because surge environments here can exceed on-chip ESD capability, pair the driver with external TVS diodes and gas-discharge protection at the terminal block; the on-chip ESD then acts as a second defensive layer after the board-level surge network clamps the bulk of the event.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ISL32614EFHZ-T — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ISL32613EFHZ-T | ISL32614EFHZ-T7A | ISL3284EFHZ-T |
|---|---|---|---|---|
| Package | SOT-23-6 | SOT-23-6 - same | SOT-23-6 - same | SOT-23-6 - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Function | Driver only (1/0) | Driver only (1/0) | Driver only (1/0) | Transceiver (driver + receiver) |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
主な差別化要因
- True 1.8V supply compatibility （vs ISL3284EFHZ-T)
- Ultra-low bus loading for mega-node networks （vs Standard unit-load RS-485 drivers)
- Drop-in reel-format flexibility （vs ISL32614EFHZ-T7A)
設計ノート
The ISL32614EFHZ-T is a driver-only device (DigiKey lists 1 driver / 0 receivers). Designs that assumed a half-duplex transceiver will lose the receive path - add a companion receiver such as the ISL32611E on the same 1.8V rail. Additionally, because driver outputs tri-state when DE is low, the bus has no defined idle state; place fail-safe bias resistors (typically 560 ohms to VCC at A/Y and 560 ohms to GND at B/Z, adjusted for termination) so the differential voltage stays above the receiver threshold when all drivers are off.
Keep the VCC decoupling capacitor (100nF ceramic) within 2mm of pin 5 with a short, direct ground return via to pin 2. Route the Y/Z differential pair together with matched length and 120-ohm differential impedance where possible, and place any TVS diodes at the connector side so the ESD energy is clamped before reaching the IC - the on-chip +/-16.5kV HBM rating is a last line of defense, not a substitute for board-level surge protection on long field cable runs.
Estimated: at a 3.3V supply the driver draws its quiescent current plus load current into the 54-60 ohm terminated bus (two 120-ohm terminations in parallel), giving a supply current on the order of 50mA when actively driving - size the 1.8V-3.6V rail's LDO or buck output accordingly and verify thermal rise in the SOT-23-6 (roughly 200C/W theta JA) stays within limits at your duty cycle. Gating DE off between frames removes nearly all of this load, which matters greatly in battery nodes.
コンプライアンス情報
RoHS compliant and ACTIVE per Renesas product page and DigiKey/Mouser listings as of 2026-10-12. REACH, halogen-free and conflict-minerals status not stated in provided data.
