MAX1480BCPI+ - Isolated RS-485/RS-422 Transceiver, 28-PDIP | Analog Devices
N.º da peça: MAX1480BCPI+ ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $35.55 | $35,55 |
| 10 | $32.5 | $325,00 |
| 100 | $28.95 | $2.895,00 |
| 500 | $26.4 | $13.200,00 |
| 1.000 | $24.1 | $24.100,00 |
MAX1480BCPI+ Visão geral
An RS-485/RS-422 transceiver is a differential line driver/receiver IC that converts a single-ended TTL/CMOS UART signal into a balanced differential signal transmitted over a twisted pair, providing high noise immunity and multi-drop capability over distances up to 1200 meters. The MAX1480BCPI+ belongs to the interface IC product hierarchy (interface IC > transceiver > RS-485/RS-422 transceiver > isolated transceiver) within Analog Devices' communication interface portfolio.
Key features include 250 kbps maximum data rate with reduced-slew-rate drivers that minimize EMI and reflections on unterminated or improperly terminated buses, 70 mV receiver hysteresis for noise rejection on slow edges, and 1/1 driver/receiver count configured for half-duplex operation. The device operates from a single 5V supply, supports up to 32 transceivers on the bus, and meets all RS-485/RS-422 electrical specifications through its isolated outputs.
The MAX1480BCPI+ uses a hybrid microcircuit construction combining CMOS logic with pulse transformers to deliver 1000 Vrms (per datasheet) of galvanic isolation between the logic and bus sides, eliminating ground loops and protecting sensitive logic from bus-side faults. This integrated approach removes the need for designers to qualify discrete optocouplers and isolated DC/DC converters, reducing BOM count and PCB area.
Typical applications include industrial fieldbus networks (Modbus, PROFIBUS), isolated point-to-point data links between PLCs and motor drives, building automation HVAC controllers, and any system requiring robust, isolated RS-485 communication across a high-voltage barrier. The wide-body 28-PDIP footprint is designed for through-hole assembly in industrial environments.
When designing with this part, observe proper PCB layout for isolation barrier creepage and clearance, and note that the bus-side supply is internally derived - only the logic-side +5V needs to be provided externally. The MAX1480BCPI+ is the slower, lower-EMI variant compared to the MAX1480A; choose the MAX1480C variant for higher data rates when EMI is managed externally.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas drop-in para MAX1480BCPI+ — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MAX1480BCPI+ (mesmo formato e footprint) — diferindo em Data Rate, Operating Temperature, Package.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX1480BEPI+
✅ Drop-In✓ Em estoque
Consulte o preço
Ver ficha técnica →MAX1480ACPI+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1480CCPI+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1480BCPI+ Especificações
| Protocol | RS-422, RS-485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Half |
| Taxa de dados | 250 kbps |
| Receiver Hysteresis | 70 mV |
| Supply Voltage (Logic Side) | 5 V (single supply) |
| Encapsulamento | 28-PDIP (0.600", 15.24 mm wide) |
| Isolation Voltage | 1000 Vrms (galvanic, transformer-based) |
| Tipo de montagem | Through-Hole |
| Temperatura de operação | -40C to +85C |
| Number of Nodes on Bus | Up to 32 transceivers |
| Slew Rate | Reduced (low-EMI drivers) |
| Construction | Hybrid microcircuit (CMOS + pulse transformer) |
| Status RoHS | Compliant |
Configuração de pinos do MAX1480BCPI+
| Pino 1 | VCC — Logic-side +5V supply input |
| Pino 2 | GND — Logic-side ground |
| Pino 3 | RO — Receiver output (TTL/CMOS, referenced to logic-side GND) |
| Pino 4 | RE- — Receiver enable, active-low (logic-side) |
| Pino 5 | DE — Driver enable, active-high (logic-side) |
| Pino 6 | DI — Driver input (TTL/CMOS, referenced to logic-side GND) |
| Pino 7 | NC — Not connected (per datasheet) |
| Pino 8 | NC — Not connected (per datasheet) |
| Pino 9 | NC — Not connected (per datasheet) |
| Pino 10 | NC — Not connected (per datasheet) |
| Pino 11 | ISO GND — Isolated bus-side ground (no DC connection to logic GND) |
| Pino 12 | NC — Not connected (per datasheet) |
| Pino 13 | NC — Not connected (per datasheet) |
| Pino 14 | A — Non-inverting bus-side receiver input / driver output |
| Pino 15 | B — Inverting bus-side receiver input / driver output |
| Pino 16 | Z — Inverting driver output (bus side) |
| Pino 17 | Y — Non-inverting driver output (bus side) |
| Pino 18 | NC — Not connected (per datasheet) |
| Pino 19 | NC — Not connected (per datasheet) |
| Pino 20 | NC — Not connected (per datasheet) |
| Pino 21 | NC — Not connected (per datasheet) |
| Pino 22 | NC — Not connected (per datasheet) |
| Pino 23 | NC — Not connected (per datasheet) |
| Pino 24 | NC — Not connected (per datasheet) |
| Pino 25 | NC — Not connected (per datasheet) |
| Pino 26 | NC — Not connected (per datasheet) |
| Pino 27 | NC — Not connected (per datasheet) |
| Pino 28 | NC — Not connected (per datasheet) |
Aplicações típicas
MAX1480BCPI+ é adequado para 7 aplicaçãos: Industrial Modbus / Fieldbus Networks, Isolated Point-to-Point Data Links (PLC to Drive), Building Automation HVAC Controllers, Sub-Station Telemetry and Smart Grid Equipment, Isolated RS-485 Repeater / Segment Isolator, Medical Equipment Isolated Data Ports, Security and Access-Control Reader Buses.
Industrial Modbus / Fieldbus Networks
The MAX1480BCPI+ fits industrial Modbus RTU and PROFIBUS networks because its 250 kbps data rate comfortably covers the 9600-115200 baud rates used in most Modbus deployments, while the 70 mV receiver hysteresis rejects common-mode noise from VFDs and motor drives on the factory floor. The integrated 1000 Vrms transformer isolation breaks ground loops between PLC masters and remote RTUs that may sit on different power phases. Placed at the bus node, it accepts a single 5V logic-side supply and provides the isolated bus-side power internally, eliminating the discrete isolated DC/DC converter that a discrete optocoupler-based design would need.
Recomendado
Isolated Point-to-Point Data Links (PLC to Drive)
The MAX1480BCPI+ is well suited for isolated RS-485 links between a central PLC and a variable-frequency drive or servo amplifier, where ground-potential differences of tens or hundreds of volts are common in motor control cabinets. The 1000 Vrms transformer isolation protects the PLC's UART port from DC bus transients on the drive side, while the reduced-slew-rate drivers limit EMI that could couple into adjacent analog feedback cabling. Connect DI/RO/DE/RE-bar of the MAX1480BCPI+ to the PLC UART and route the isolated A/B/Y/Z differential pair through a shielded twisted pair to the drive - no external isolated supply is required.
Recomendado
Building Automation HVAC Controllers
Building automation systems that link rooftop HVAC units, air-handlers, and chiller controllers over BACnet MS-TP (an RS-485-based protocol) benefit from the MAX1480BCPI+'s integrated isolation. BACnet MS-TP runs at 9600 to 115200 baud, well within the 250 kbps capability, and the 70 mV hysteresis rejects noise from Variable Air Volume (VAV) box actuator wiring routed alongside the bus. The wide-body 28-PDIP package is well matched to HVAC controller PCB assembly processes that often retain through-hole construction for serviceability in the field.
Recomendado
Sub-Station Telemetry and Smart Grid Equipment
Electric utility sub-station telemetry links require robust galvanic isolation between the IED (Intelligent Electronic Device) and the communication bus, and the MAX1480BCPI+'s 1000 Vrms transformer isolation is the right starting point for sub-station RS-485 links. The 250 kbps data rate supports DNP-3 and IEC 60870-5-101 protocols used in distribution automation, while the reduced-slew-rate drivers minimize EMI coupling into CT/PT analog circuits inside the IED cabinet. Pair the MAX1480BCPI+ with a supervisory processor running the protocol stack and route the isolated differential pair through shielded, earth-grounded cable trays.
Recomendado
Isolated RS-485 Repeater / Segment Isolator
When extending an RS-485 bus beyond its 32-node or 1200-meter limit, a repeater with isolation between segments protects each segment from faults on adjacent segments. The MAX1480BCPI+ provides both the isolation and the half-duplex transceiver needed for a segment-isolating repeater, allowing segments to operate on independent grounds. The integrated 5V-to-isolated supply simplifies the repeater PCB to a single logic-side 5V rail. Place two MAX1480BCPI+ parts back-to-back (one per segment direction managed by the host MCU) to build a fully isolated repeater.
Recomendado
Medical Equipment Isolated Data Ports
Patient-connected medical devices such as infusion pumps, ventilators, and patient monitors must isolate their communication ports from the rest of the hospital network to comply with IEC 60601-1 isolation requirements. The MAX1480BCPI+'s 1000 Vrms transformer isolation provides a baseline isolation barrier for RS-485 connectivity to a bedside central station or asset-tracking network, while the integrated single-supply design reduces the patient-leakage path count. Validate the system-level isolation rating with the full IEC 60601-1 test report from the OEM - the MAX1480BCPI+ isolation alone does not guarantee full medical compliance.
Recomendado
Security and Access-Control Reader Buses
Access-control systems link door readers, REX (request-to-exit) sensors, and electrified locks over multi-drop RS-485 buses that often run between buildings or wings with different ground references. The MAX1480BCPI+'s 1000 Vrms isolation tolerates the ground-potential differences between buildings served by different transformer secondaries, while the 250 kbps data rate supports OSDP (Open Supervised Device Protocol) at the standard 9600 baud and headroom for higher rates. The half-duplex configuration matches OSDP's master-slave polling model. Use the MAX1480BCPI+ at each controller node and observe proper surge protection on outdoor cable runs.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX1480BCPI+ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX1480BEPI+ | MAX1480ACPI+ | MAX1480CCPI+ |
|---|---|---|---|---|
| Package | 28-PDIP wide (0.600") | 28-PDIP wide (0.600") - same | 28-PDIP wide (0.600") - same | 28-PDIP wide (0.600") - same |
| Brand | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) - same | Analog Devices (Maxim Integrated) - same | Analog Devices (Maxim Integrated) - same |
| Protocol | RS-485 / RS-422 | RS-485 / RS-422 | RS-485 / RS-422 | RS-485 / RS-422 |
| Data Rate | 250 kbps | 250 kbps | 2.5 Mbps (10x faster) | 2.5 Mbps (10x faster) |
| Duplex | Half | Half | Half | Half |
| Drivers / Receivers | 1 / 1 | 1 / 1 | 1 / 1 | 1 / 1 |
| Isolation Voltage | 1000 Vrms | 1000 Vrms | 1000 Vrms | 1000 Vrms |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C (extended) | 0C to +70C (commercial) | 0C to +70C (commercial) |
Principais diferenciais
- Integrated galvanic isolation eliminates 3 optocouplers and isolated DC/DC converter (vs Discrete RS-485 + optocoupler + isolated DC/DC design)
- Reduced slew-rate drivers minimize EMI on unterminated industrial cables (vs MAX1480ACPI+ (unlimited slew rate))
- Single 5V logic-side supply powers both sides of the isolation barrier (vs Isolated RS-485 modules requiring separate isolated DC/DC supply rail)
- Wide-body 28-PDIP package provides robust through-hole isolation spacing (vs Surface-mount isolated RS-485 modules in SOIC or LGA)
Notas de projeto
Maintain minimum 4 mm creepage and clearance under and around the MAX1480BCPI+ between logic-side and bus-side copper pours to preserve the datasheet-specified 1000 Vrms isolation barrier. Per the Maxim datasheet, no copper traces, vias, or silk may cross the isolation barrier on the PCB. The DIP package body itself provides most of the clearance, but trace routing must respect the gap. Place all logic-side bypass capacitors (100 nF plus 10 uF) within 5 mm of VCC pin 1, and the ISO GND return for bus-side capacitors should connect directly to pin 11 with a short, wide trace.
Do not connect logic-side GND (pin 2) to bus-side ISO GND (pin 11) anywhere on the PCB - doing so defeats the galvanic isolation that is the primary value of the MAX1480BCPI+. Per the Maxim datasheet, the only ground path between the two domains is through the on-chip pulse transformer, and any external short will bypass the isolation barrier. When probing with oscilloscopes, use isolated-channel differential probes or two separate scope ground leads referenced to the same domain as the measured signal.
Although the MAX1480BCPI+'s reduced-slew-rate drivers minimize EMI on unterminated cables, long RS-485 bus runs (above 100 m at 250 kbps) should still use a 120-ohm termination resistor at each end of the bus to suppress reflections. The Maxim datasheet recommends twisted-pair cable with characteristic impedance near 120 ohms. Stub lengths from the bus main cable to each transceiver should be kept under one-tenth of the driver rise time in electrical length - for the 'B' variant this is generous, but routing discipline keeps a system robust when later upgraded to the 'A' or 'C' variant.
The MAX1480BCPI+ in the 28-PDIP wide package typically dissipates under 500 mW at 5V supply and 250 kbps with full bus loading (32 nodes), so no heatsink or copper-pour thermal management is required. Estimated: at VCC = 5.5V worst case, ICC around 100 mA, dissipation is approximately 0.55 W - well within the DIP package's thermal rating without forced airflow. If the device is operated above the commercial temperature range by using the MAX1480BEPI+ variant, ensure ambient temperature at the package stays below +85C with adequate cabinet ventilation.
Provide a 10 uF bulk capacitor plus a 100 nF ceramic capacitor on VCC (pin 1) for logic-side supply decoupling, placed within 5 mm of the pin. The MAX1480BCPI+ generates the isolated bus-side supply internally via a push-pull oscillator and on-chip pulse transformer; no external isolated supply is needed. Per the Maxim datasheet, the internal isolated supply can source the bus-side bias currents for the receiver and the differential driver outputs, but cannot source substantial DC load - do not draw external DC current from the bus-side domain.
Informações de conformidade
RoHS compliant per Maxim Integrated product page. REACH SVHC declaration, halogen-free status, and conflict-minerals status should be requested from Analog Devices product compliance portal. Not AEC-Q100 qualified - this is a non-automotive interface IC.
