ISL3295EFHZ-T - ±16.5kV ESD RS-485 Transmitter, SOT-23-6 | Renesas
N.º da peça: ISL3295EFHZ-T ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.85 | $1,85 |
| 10 | $1.65 | $16,50 |
| 100 | $1.42 | $142,00 |
| 500 | $1.18 | $590,00 |
| 1.000 | $0.95 | $950,00 |
| 3.000 | $0.78 | $2.340,00 |
ISL3295EFHZ-T Visão geral
An RS-485 transmitter is a line driver that converts a single-ended TTL/CMOS logic signal into a differential signal that can travel over long twisted-pair cables in industrial environments. RS-485 belongs to the broader TIA/EIA-485 family of differential, multipoint serial standards, sitting beneath the EIA-422 (4-wire, single driver, multi-drop) and EIA-485 (2-wire, multi-drop, multi-driver) hierarchies. Differential signalling gives RS-485 its hallmark immunity to common-mode noise, ground loops, and large voltage offsets between nodes, making it the dominant physical layer in factory automation, building control, and instrumentation.
Key features of the ISL3295EFHZ-T include 16.5kV HBM ESD protection on the bus pins (7kV IEC 61000-4-2 contact discharge), a hot-plug feature that prevents false transitions on VCC ramp, and a logic supply pin (VL) that lets the DI/DE inputs interface with lower-voltage logic without level shifters. The 1/8 unit-load receiver input impedance supports up to 256 transceivers on a single bus, dramatically increasing node count compared to legacy 1-UL or 32-unit-load designs.
The part uses a CMOS process and integrates charge-pump generation for the higher-than-VCC driver swing needed to meet RS-485 output common-mode range (±1.5V). Internal slew-rate control limits edge rates to roughly 1V/ns, minimising radiated emissions. Quiescent current stays below 1 mA in shutdown and is typically a few hundred microamps when active.
Typical applications include multi-drop RS-485 networks in industrial process control, HVAC equipment, building automation, and point-of-sale terminals. The small SOT-23-6 footprint makes it ideal for space-constrained remote sensor nodes and motor-control interface boards. The high node count suits high-node-count networks.
When designing with this part, ensure the VL pin is tied to the logic supply and decoupled with a 100 nF capacitor. The bus pins need a 100 ohm differential termination at the cable ends and proper guard traces for ESD robustness. Avoid leaving DE floating; tie it high to enable the driver.
This page synthesises distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving a clearer picture of cross-vendor sourcing than the Renesas product page alone.
Alternativas drop-in para ISL3295EFHZ-T — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ISL3295EFHZ-T7A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISL3295EIHZ-T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISL3295EIHZ-T7A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISL3294EIHZ-T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISL3296EIHZ-T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISL3293EIHZ-T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISL3295EFHZ-T Especificações
| Função | Single RS-485/RS-422 Transmitter (Driver Only) |
| Number of Drivers/Receivers | 1/0 |
| Protocol | RS-422, RS-485 |
| Supply Voltage (VCC) | 3.0 V to 5.5 V |
| Logic Supply (VL) | Logic-compatible with lower-voltage systems |
| Maximum Data Rate | 500 kbps |
| ESD Protection (HBM, Bus Pins) | ±16.5 kV |
| ESD Protection (IEC 61000-4-2, Contact) | ±7 kV |
| Node Count (Unit Load) | 256 nodes (1/8 unit load) |
| Temperatura de operação | -40 °C to +125 °C |
| Encapsulamento | 6-Pin SOT-23 |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Hot-Plug Support | Yes (no false VCC transitions) |
| Slew-Rate Limited | Yes (EMI control) |
Configuração de pinos do ISL3295EFHZ-T
| Pino 1 | VCC — Main supply voltage (3.0V to 5.5V) |
| Pino 2 | VL — Logic supply for DI/DE inputs (mixed-voltage support) |
| Pino 3 | GND — Ground reference |
| Pino 4 | DI — Driver input (TTL/CMOS logic) |
| Pino 5 | DE — Driver enable (active-high; tie high to enable) |
| Pino 6 | Y — Differential driver non-inverting output |
Aplicações típicas
ISL3295EFHZ-T é adequado para 6 aplicaçãos: Industrial Multi-Drop RS-485 Network, Building Automation and Lighting Control, Point-of-Sale and Retail Peripherals, Motor Drive and Servo Communication, Long-Reach Sensor and Metering Networks, DMX512 Stage Lighting and Audio Control.
Industrial Multi-Drop RS-485 Network
The ISL3295EFHZ-T is purpose-built for high-node-count industrial RS-485 networks such as factory floor process control and PLC backplanes. Its 1/8 unit-load receiver input supports up to 256 transceivers on a single twisted pair, 8× the legacy 32-node limit, which directly enables dense sensor arrays. The ±16.5 kV HBM ESD rating on the bus pins (7 kV IEC 61000-4-2 contact) eliminates the need for external TVS diodes in typical installations, reducing BOM cost. Operates from 3.0V to 5.5V with VL pin supporting mixed-voltage logic, this Renesas transmitter integrates cleanly into PLC and DCS I/O modules requiring +125°C tolerance.
Recomendado
Building Automation and Lighting Control
In building automation, the ISL3295EFHZ-T drives RS-485 segments for BACnet MS/TP, DALI gateways, and HVAC control panels. Its SOT-23-6 footprint saves board area versus SOIC-8 alternatives — critical for thermostat and sensor-node form factors. The 500 kbps slew-rate-limited driver minimises reflections on the long, unshielded twisted-pair runs typical of building wiring, while the ±16.5 kV ESD withstands installer mis-wiring surges. Operating from 3.3V, the device pairs cleanly with low-power microcontrollers. Combined with its +125°C tolerance, the Renesas ISL3295EFHZ-T is well suited to rooftop equipment enclosures with wide thermal swings.
Recomendado
Point-of-Sale and Retail Peripherals
POS terminals and retail scanner hubs use the ISL3295EFHZ-T to drive RS-485 buses linking barcode scanners, receipt printers, and cash drawers over a few metres of cable. The 500 kbps data rate comfortably handles typical POS traffic, and the controlled edge rates reduce EMI that could disturb nearby sensitive electronics (display drivers, EMV card readers). The hot-plug feature prevents false driver transitions when a peripheral is hot-swapped during operation — a real-world reliability issue in retail environments. VL pin allows interfacing with 1.8V system-on-chip GPIO without level shifters, simplifying design in compact, low-cost POS terminals.
Recomendado
Motor Drive and Servo Communication
Servo drives and stepper motor controllers integrate the ISL3295EFHZ-T on RS-485 command and feedback links between the controller and the motor amplifier. The SOT-23-6 package fits on small inverter PCBs alongside the power stage, and the +125°C temperature rating tolerates the elevated ambient inside an enclosed drive. The VL pin lets the transmitter interface directly with the 1.5V or 1.8V logic common to modern DSP/MCU controllers without level-shifters, simplifying the BOM. ±16.5 kV ESD protects the bus pins from accidental cable-discharge events during commissioning, while the 256-node unit load is overkill for single-axis drives but enables multi-axis control panels.
Recomendado
Long-Reach Sensor and Metering Networks
The ISL3295EFHZ-T is well suited to utility metering, smart sensor, and SCADA RTU nodes connected via long runs of twisted-pair cable. The 1/8 unit-load input supports up to 256 transceivers per bus, which is essential when aggregating hundreds of metering endpoints across a building or substation. The ±16.5 kV HBM ESD rating provides robustness against induced surges on outdoor cables, while the 3.0V to 5.5V supply range suits battery-backed or solar-powered metering designs. Slew-rate-limited edges reduce radiated emissions that could interfere with sensitive measurement front-ends.
Recomendado
DMX512 Stage Lighting and Audio Control
Stage lighting, theatre dimmer racks, and professional audio consoles commonly use the DMX512 protocol, which runs over RS-485 at 250 kbps — well within the ISL3295EFHZ-T's 500 kbps ceiling. The SOT-23-6 footprint enables compact moving-light fixture PCBs, while ±16.5 kV ESD protects the XLR connectors that are routinely handled by crew during set changes. The hot-plug feature prevents the data corruption that plagues DMX fixtures when fixtures are swapped mid-show. The VL pin lets the transmitter interface directly with low-voltage microcontrollers common in modern LED drivers and motorised yoke controllers, simplifying the design and reducing BOM cost.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ISL3295EFHZ-T — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ISL3295EFHZ-T7A | ISL3295EIHZ-T | ISL3294EIHZ-T | ISL3296EIHZ-T | ISL3293EIHZ-T |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | SOT-23-6 | SOT-23-6 (same) | SOT-23-6 (same) | SOT-23-6 (same) | SOT-23-6 (same) | SOT-23-6 (same) |
| Maximum Data Rate | 500 kbps | 500 kbps | 500 kbps | 115 kbps | 20 Mbps | 2.5 Mbps |
| ESD HBM (Bus Pins) | ±16.5 kV | ±16.5 kV | ±16.5 kV | ±16.5 kV | ±16.5 kV | ±16.5 kV |
| ESD IEC 61000-4-2 Contact | ±7 kV | ±7 kV | ±7 kV | ±7 kV | ±7 kV | ±7 kV |
| Node Count (Unit Load) | 256 (1/8 UL) | 256 (1/8 UL) | 256 (1/8 UL) | 256 (1/8 UL) | 256 (1/8 UL) | 256 (1/8 UL) |
| Operating Temperature | -40°C to +125°C | -40°C to +125°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
| Supply Voltage | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V |
Principais diferenciais
- Highest-in-class bus-pin ESD protection at ±16.5 kV HBM / ±7 kV IEC 61000-4-2 (vs Legacy RS-485 transmitters (e.g. SN75176, MAX3485))
- 1/8 unit load supports 256 nodes on a single bus (vs Legacy 1-UL parts (e.g. MAX3485, SN75176))
- Logic supply (VL) pin enables mixed-voltage interfacing (vs Single-supply RS-485 transmitters)
Notas de projeto
Place 100 nF decoupling capacitors on both VCC (pin 1) and VL (pin 2) as close to the device as possible. Add a 10 µF bulk capacitor at the board-level VCC rail. The SOT-23-6 thermal pad is not connected to ground on most ISL3295E layouts — verify against the datasheet before relying on copper pour for heatsinking. Keep the differential Y/Z traces matched in length (±2 mm) and routed over a continuous ground plane for controlled impedance (typically 100 Ω differential).
Add a 100 Ω differential termination at each end of the bus cable to suppress reflections. Avoid routing the bus signals near switching nodes or transformers. The Renesas datasheet recommends TVS protection (e.g. PESD0603-06) at the connector for additional IEC 61000-4-2 robustness, although the ISL3295EFHZ-T's integrated ±16.5 kV ESD protection is typically sufficient for most industrial installations without external TVS. Tie the DE pin high through a 10 kΩ pull-up to ensure the driver is enabled by default.
Do not leave the DE pin floating — floating enables are the leading cause of bus contention and phantom-powering issues on multi-drop RS-485 networks. Do not exceed 256 transceivers on a single bus when using 1/8-UL parts (1/8 UL × 256 = 32 UL total, the legacy limit). Do not mix 1/8 UL parts with full-UL parts on the same bus without recalculating the total load. The VL pin must be tied to a valid logic supply (≥ 1.2V) before the DI/DE inputs are driven, otherwise input thresholds are undefined. Hot-plug events on VCC can cause false driver transitions unless the hot-plug feature is enabled (default on ISL3295E).
The 500 kbps slew-rate-limited driver limits edge rates to roughly 1V/ns, reducing reflections on unterminated or short cable stubs. For applications above 10 Mbps, switch to a faster variant such as ISL3296E (20 Mbps) or ISL3293E (2.5 Mbps) — but be aware that faster edges require better cable and connector quality. Maintain at least 3× the cable propagation delay between driver rise time and stub length to avoid signal-integrity issues on multi-drop branches.
Informações de conformidade
RoHS and REACH compliant per Renesas product page (part is lead-free). Not AEC-Q100 qualified for automotive; choose ISL3179E automotive-grade family for AEC-Q100 applications. Halogen-free status not explicitly stated in datasheet excerpt — set to unknown per data authenticity rules.
