ISL3283EFHZ-T - ±16.5kV ESD, 20Mbps RS-485 Receiver, SOT-23-6 | Renesas
MPN: ISL3283EFHZ-T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.18 | $2.18 |
| 10 | $1.96 | $19.60 |
| 100 | $1.74 | $174.00 |
| 500 | $1.45 | $725.00 |
| 1,000 | $1.18 | $1,180.00 |
ISL3283EFHZ-T Overview
An RS-485/RS-422 receiver is a differential line receiver that translates balanced differential signals transmitted over twisted-pair cabling into single-ended logic levels compatible with UARTs, MCUs, and FPGAs. RS-485 receivers belong to the broader interface IC family, which sits within the integrated circuits hierarchy as a bridge between digital controllers and physical communication media in industrial networks, building automation, and process control systems.
Key features include ±16.5kV IEC61000-4-2 ESD protection on bus pins, 20Mbps signaling rate, true 1/8 unit load for high-node-count networks, full fail-safe (open, shorted, terminated but idle bus) receiver thresholds, and an extended industrial -40°C to +125°C operating temperature range. The SOT-23-6 footprint is one of the smallest packages available for isolated RS-485 receivers, enabling dense PCB layouts.
The ISL3283E uses a precision differential comparator architecture with hysteresis and integrated IEC61000 ESD protection structures. The low-bus-current design reduces loading on the differential pair, supporting 256-node multi-drop configurations that exceed the standard 32-node RS-485 limit, simplifying daisy-chained industrial sensor networks.
Typical applications include industrial fieldbus networks (Profibus, Modbus), building automation (BACnet, LonWorks), HVAC controllers, security system data links, and any point-to-point or multi-drop RS-485 link requiring high ESD immunity in electrically harsh environments.
When designing, add a 100nF decoupling capacitor close to VCC and ensure the enable pin is tied high (inactive) or driven by the controller for power savings. The 1/8 unit load allows up to 256 nodes, but verify that total termination and stub length budgets remain within TIA/EIA-485-A guidelines.
This page synthesizes distributor pricing, drop-in cross-brand alternatives, and practical PCB layout notes that go beyond the manufacturer datasheet's typical application section.
Drop-in alternatives for ISL3283EFHZ-T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL3283EFHZ-T7A
✅ Drop-In📋 Reference alternative (not in catalog)
ISL3283EIHZ-T
✅ Drop-In📋 Reference alternative (not in catalog)
ISL3282EFHZ-T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX3283EESA+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX3283EESA+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX3283EESA/V+
✅ Drop-In📋 Reference alternative (not in catalog)
ISL3283EFHZ-T Specifications
| Function | RS-485/RS-422 Receiver |
| Protocol | RS-422, RS-485 |
| Number of Receivers | 1 |
| Data Rate | 20 Mbps |
| Supply Voltage (VCC) | 3.0 V to 5.5 V |
| Bus Current (1/8 unit load) | +125 µA / -100 µA |
| ESD Protection (Bus Pins) | ±16.5 kV IEC61000-4-2 |
| Fail-Safe | Full fail-safe (open/shorted/idle) |
| Receiver Enable Pin | Active-low (/RE) |
| Maximum Nodes on Bus | 256 |
| Operating Temperature | -40 °C to +125 °C |
| Package | SOT-23-6 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ISL3283EFHZ-T Pin Configuration
| Pin 1 | RO — Receiver Output (CMOS logic, referenced to VCC) |
| Pin 2 | /RE — Receiver Enable, active-low (logic low = receiver enabled, high = high-Z output) |
| Pin 3 | GND — Ground reference |
| Pin 4 | A — Non-inverting differential bus input (RS-485/RS-422) |
| Pin 5 | B — Inverting differential bus input (RS-485/RS-422) |
| Pin 6 | VCC — Supply voltage input (3.0V to 5.5V) |
Typical Applications
ISL3283EFHZ-T is suitable for 6 applications: Industrial Fieldbus Networks (Modbus, Profibus), Building Automation (BACnet MS/TP, LonWorks), Security & Surveillance Camera Data Links, Solar Inverter & Energy Storage Communication, Medical Equipment Data Acquisition, LED Lighting & Stage Control DMX-512.
Industrial Fieldbus Networks (Modbus, Profibus)
The ISL3283EFHZ-T fits industrial fieldbus networks because its 1/8 unit-load (125µA/-100µA bus current) lets designers deploy up to 256 nodes on a single twisted pair, far above the 32-node ceiling of legacy 1-unit-load receivers like the ISL32611E. The 20Mbps data rate covers Profibus DP (12Mbps) and high-speed Modbus RTU links used in factory automation. Placed on each slave device's UART RX line, the receiver converts the differential bus signal to CMOS logic; the integrated ±16.5kV IEC61000-4-2 ESD protects against cable-discharge events when long shielded cables are reconnected in the field, reducing the need for external TVS protection.
Recommended
Building Automation (BACnet MS/TP, LonWorks)
The ISL3283EFHZ-T is ideal for BACnet MS/TP and LonWorks building-automation networks because its 1/8 unit load supports dense sensor networks (256 nodes per segment) in HVAC controllers, lighting panels, and access-control systems. The 20Mbps rate exceeds BACnet's 115.2kbps minimum with margin for future speed upgrades. Connected between the RS-485 bus and a Cortex-M MCU UART, the receiver's full fail-safe (open, shorted, idle-bus) thresholds eliminate the external bias resistors otherwise required on the bus, reducing BOM cost. The -40°C to +125°C operating range covers unconditioned rooftop and basement installations.
Recommended
Security & Surveillance Camera Data Links
The ISL3283EFHZ-T enables long-distance PTZ camera data links over RS-485 wiring because its ±16.5kV ESD rating withstands lightning-induced surges on outdoor cable runs. With 20Mbps capability and 256-node support, a single RS-485 trunk can carry telemetry from a fleet of cameras. The receiver sits between the bus and a microcontroller UART; its SOT-23-6 footprint simplifies integration into compact dome-camera enclosures. Compared to non-ESD-protected receivers that require external TVS arrays, the integrated IEC61000-4-2 protection reduces PCB area and BOM cost in space-constrained IP-camera designs.
Recommended
Solar Inverter & Energy Storage Communication
The ISL3283EFHZ-T is well-suited for solar inverter daisy-chain communication because its 1/8 unit load enables large string-monitoring networks (up to 256 panels per RS-485 segment) while its -40°C to +125°C rating covers rooftop thermal cycling. The 20Mbps data rate handles aggregated inverter telemetry, fault logs, and firmware updates. Installed on each inverter's RS-485 RX line, the receiver's ±16.5kV ESD protects against ground-potential differences and induced surges from PV array switching. The full fail-safe feature avoids false fault triggers when inverters are powered down sequentially during commissioning.
Recommended
Medical Equipment Data Acquisition
The ISL3283EFHZ-T supports medical device data-acquisition buses because its ±16.5kV ESD protects patient-monitoring networks from electrostatic discharge events during routine cleaning and equipment reconfiguration. The 1/8 unit-load feature allows dense bed-side-monitor topologies (up to 256 nodes), while the 20Mbps rate accommodates multi-channel vital-sign telemetry. Connected between the RS-485 backbone and a DSP or ARM MCU, the receiver's full fail-safe prevents false alarms when sensors are unplugged. Note: medical safety certifications (IEC 60601-1) must be validated at the system level by the OEM.
Recommended
LED Lighting & Stage Control DMX-512
The ISL3283EFHZ-T suits DMX-512 stage-lighting and architectural-LED control networks because its 1/8 unit load supports 256-node installations and its 20Mbps data rate exceeds DMX-512's 250kbps requirement with overhead for newer DMX-512-A extensions. The ±16.5kV ESD withstands transient discharge events common in concert venues with long cable runs. Mounted at each fixture's data-input stage, the receiver decodes differential DMX packets to a Cortex-M LED controller. Compared to legacy MAX485 receivers, the ISL3283E's 1/8 UL eliminates the 120Ω termination-loading compromises in mixed-protocol lighting rigs.
Recommended
Recommended Products Summary
Engineering reference data for ISL3283EFHZ-T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL3283EFHZ-T7A | ISL3283EIHZ-T | ISL3282EFHZ-T | MAX3283EESA+ |
|---|---|---|---|---|---|
| Package | SOT-23-6 | SOT-23-6 (same) | SOT-23-6 (same) | SOT-23-6 (same) | SOT-23-6 (same) |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Analog Devices |
| Data Rate | 20 Mbps | 20 Mbps | 20 Mbps | 20 Mbps | 20 Mbps |
| Unit Load | 1/8 UL | 1/8 UL | 1/8 UL | 1/8 UL | 1/8 UL |
| ESD Protection | ±16.5 kV IEC61000-4-2 | ±16.5 kV | ±16.5 kV | ±16.5 kV | ±15 kV (≈ -10%) |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Enable Pin Polarity | Active-low | Active-low | Active-low | Active-low | Active-low |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C (industrial) |
| Max Nodes on Bus | 256 | 256 | 256 | 256 | 256 |
| Approx. Unit Price (qty 100) | $1.74 | $1.74 (est. same die) | $1.85 (est. industrial) | $1.80 (est. same family) | $2.10 (est.) |
Key Differentiators
- Industry-leading ±16.5kV IEC61000-4-2 ESD protection (vs MAX3283EESA+)
- Extended industrial -40°C to +125°C temperature range (vs MAX3283EESA+)
- Active-low enable pin logic (vs ISL3281EFHZ-T)
- Pin-compatible family with 6/8/14-pin variants (vs MAX3283 (single function only))
Design Notes
Place a 100nF (0.1µF) X7R decoupling capacitor as close as possible (within 2mm) to the VCC pin (pin 6) to suppress high-frequency noise on the supply rail. Keep the A and B bus traces short and matched-length to minimize common-mode noise coupling. The exposed SOT-23-6 pad is not present on this package; the die is cooled through the standard lead frame, so no additional copper thermal relief is required.
Do not leave the /RE pin (pin 2) floating — it must be tied either directly to GND for always-enabled operation or driven by a controller GPIO. A floating /RE pin can cause the receiver output to enter an indeterminate state. For always-enabled designs, drive /RE low (logic 0). Also, ensure proper RS-485 bus termination (120Ω between A and B at both ends of the cable run) to prevent signal reflections at 20Mbps.
Estimated: at 20Mbps with the worst-case 1/8 unit-load receiver, the maximum stub length per node should be kept below 0.3m (per TIA/EIA-485-A guidelines) to avoid reflections. For a 256-node network, use a backbone topology rather than a star — connect each node's stub as close to the main trunk as possible. The fail-safe thresholds (typically ±200mV differential) provide noise margin but do not compensate for improperly terminated buses.
Although the ISL3283EFHZ-T is a receiver (not a transmitter) and draws minimal supply current (~1mA typical), if the part is used in a battery-powered sensor node, the /RE pin should be driven high during sleep to disable the receiver output and reduce quiescent draw. The internal bus-current spec (+125µA/-100µA) is independent of the supply current and contributes a small continuous load on the bus when the system is powered off.
Compliance Information
RoHS and REACH compliance per Renesas product page (EU RoHS Compliant, REACH Compliant). The -T/-T7A suffix parts are industrial grade (-40°C to +125°C) but not AEC-Q100 qualified — for automotive applications choose the MAX3283EESA/V+ variant.
