ISO7321CDR - 25Mbps 2CH 3000Vrms Digital Isolator | Texas Instruments
N.º da peça: ISO7321CDR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.35 | $2,35 |
| 10 | $2.11 | $21,10 |
| 100 | $1.82 | $182,00 |
| 500 | $1.55 | $775,00 |
| 1.000 | $1.32 | $1.320,00 |
ISO7321CDR Visão geral
A digital isolator is an IC that transfers digital signals across a galvanic isolation barrier, blocking DC and unwanted AC currents between two ground domains while permitting data to pass. Digital isolators sit within the broader signal-isolation hierarchy (isolator -> interface IC -> semiconductor) and are essential wherever safety isolation, ground-potential differences, or noise immunity are required.
Key features include integrated noise filters on the logic inputs that reject high-frequency glitches, default output high and low options for fail-safe behavior, and low power consumption: typical ICC per channel at 1 Mbps is 1.7 mA with 5V supplies for the ISO7321 variant. The device supports supply voltages from 3V to 5.5V on both sides of the barrier, enabling 3.3V-to-5V logic-level translation across the isolation gap.
The ISO732x family uses silicon dioxide (SiO2) insulation barriers formed by on-chip capacitive coupling, providing robust immunity to voltage transients, EMI, and ground-potential differences. The insulation barrier withstands 3000 VRMS for one minute per UL and 4242 Vpk per VDE, supporting reinforced-isolation designs in industrial equipment.
Typical applications include industrial fieldbus communication, isolated SPI and UART interfaces, motor-control feedback loops, and isolated power-supply monitoring in space-constrained designs thanks to the compact SOIC-8 footprint. The 25 Mbps rate comfortably covers standard UART, SPI, and PWM signaling.
When designing with the ISO7321CDR, maintain adequate creepage and clearance on the PCB to preserve the isolation rating, and place 0.1uF decoupling capacitors close to both VCC pins.
Alternativas drop-in para ISO7321CDR — 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 ISO7321CDR (mesmo formato e footprint) — diferindo em Package, RoHS Status.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ISO7321FCQDQ1
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISO7320CDR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISO7320FCDR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISO7420EDR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISO7721DR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ADUM1201ARZ
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$1.22 / unidade
Ver ficha técnica →Si8421BD-B-IS
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ISO7321CDR Especificações
| Canais | 2 (1 forward / 1 reverse) |
| Signaling Rate | 25 Mbps |
| Isolation Rating | 3000 Vrms (1 minute per UL) |
| Isolation Voltage (VDE) | 4242 Vpk |
| CMTI | 25 kV/us |
| Supply Voltage Range | 3 V to 5.5 V |
| Quiescent Current per Channel | 1.7 mA typ at 1 Mbps (5 V supplies) |
| Default Output State | High and Low options available (ISO7321 = default high) |
| Input Noise Filter | Integrated |
| Insulation Barrier | Silicon dioxide (SiO2), capacitive coupling |
| Temperatura de operação | -40C to +125C |
| Encapsulamento | SOIC-8 (D), 3.90 mm width |
| Tipo de montagem | Surface Mount |
| Data Rate Class | General purpose |
| Status RoHS | Compliant |
| Logic Level Translation | 3.3 V to 5 V across barrier |
Configuração de pinos do ISO7321CDR
| Pino 1 | VCC1 — Side-1 supply, 3V to 5.5V |
| Pino 2 | GND1 — Side-1 ground reference |
| Pino 3 | A — Side-1 logic input |
| Pino 4 | B — Side-1 logic output |
| Pino 5 | Z — Side-2 logic input |
| Pino 6 | Y — Side-2 logic output |
| Pino 7 | GND2 — Side-2 ground reference |
| Pino 8 | VCC2 — Side-2 supply, 3V to 5.5V |
Aplicações típicas
ISO7321CDR é adequado para 6 aplicaçãos: Industrial Fieldbus Communication, Isolated SPI / UART Interfaces, Motor Drive Feedback Isolation, Isolated Power Supply Monitoring, Medical Equipment Patient Isolation, Isolated CAN / Industrial Networking Nodes.
Industrial Fieldbus Communication
The ISO7321CDR's 25 Mbps rate and 3000 Vrms isolation make it ideal for isolating RS-485/fieldbus controller logic from long cable runs exposed to ground-potential differences. The 25 kV/us CMTI withstands transients from nearby motor switching, while the integrated input noise filter rejects glitches common in electrically noisy factory floors. Its low 1.7 mA per-channel current suits multi-node networks with limited isolated-side power budgets.
Recomendado
Isolated SPI / UART Interfaces
Dual 1/1 channels give one line each direction, matching SPI with a separate chip-select or a full-duplex UART link. At 25 Mbps, SPI clocks up to 25 MHz pass with margin, and UART rates far exceed 115200 baud. Placing the ISO7321CDR between an MCU and a remote sensor or ADC breaks ground loops and permits 3.3V-to-5V level translation across the barrier since each side runs independently from 3V to 5.5V supplies.
Recomendado
Motor Drive Feedback Isolation
In motor inverters, gate-driver feedback and current-sense signals cross large dv/dt events. The ISO7321CDR's 25 kV/us CMTI keeps data intact during switching transitions, and the SiO2 barrier provides 3000 Vrms working isolation between the controller and power stages. Default-high outputs give a defined safe state if the low-voltage side loses power, supporting fail-safe fault reporting in PWM and encoder feedback paths.
Recomendado
Isolated Power Supply Monitoring
Voltage, current, and temperature telemetry from a high-voltage DC bus must cross the isolation barrier safely. The ISO7321CDR isolates I2C-bit-banged or UART telemetry from current-sense amplifiers such as the INA237 on the hot side. Its compact SOIC-8 fits space-constrained PSU and telecom-rectifier boards, while low isolated-side current minimizes load on small bias supplies derived from the primary rail.
Recomendado
Medical Equipment Patient Isolation
Patient-connected front ends require galvanic isolation of digital control and data lines. The ISO7321CDR's 3000 Vrms UL-rated barrier and capacitive SiO2 insulation provide the protective isolation between patient-side analog circuitry and system-side processing electronics. Low radiated emissions from capacitive coupling suit sensitive biosignal acquisition, and the wide -40C to +125C range covers autoclave-adjacent and sterilization equipment environments.
Recomendado
Isolated CAN / Industrial Networking Nodes
For CAN and other differential network nodes, the ISO7321CDR isolates the controller-side logic from the transceiver on the bus side, protecting the MCU from bus transients and ground shifts across long cable runs. The 25 Mbps channel rate exceeds CAN FD signaling needs when paired with an appropriate transceiver. Default-high output behavior supports recessive-bus fail-safe design, and the SOIC-8 keeps node BOM area minimal.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ISO7321CDR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ISO7321FCQDQ1 | ISO7320CDR | ADuM1201ARZ |
|---|---|---|---|---|
| Package | SOIC-8 (D) 3.90 mm | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 - same footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Signaling Rate | 25 Mbps | 25 Mbps | 25 Mbps | 25 Mbps max |
| Isolation Rating | 3000 Vrms / 4242 Vpk | 3000 Vrms / 4242 Vpk | 3000 Vrms / 4242 Vpk | 2500 Vrms / 3500 Vpk |
| Default Output State | High | High | Low | High (variant-dependent) |
| Automotive Grade (AEC-Q100) | No | Yes | No | No |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
Principais diferenciais
- Default-high fail-safe output (vs ISO7320CDR)
- Automotive-qualified variant available (vs ISO7321FCQDQ1)
- Higher isolation rating than ADuM1201ARZ (vs ADuM1201ARZ)
Notas de projeto
Preserve the 3000 Vrms isolation rating by routing no copper, traces, or components under the SOIC-8 body across the barrier. Maintain creepage and clearance per UL/VDE requirements on both board layers; consider a slot under the package for higher working voltages. Keep side-1 and side-2 ground planes fully separated and connected only through the intended isolation strategy.
Place 0.1uF ceramic decoupling capacitors within 2 mm of both VCC1 and VCC2 pins, with a solid via to the respective ground plane. Each side operates from 3V to 5.5V independently; powering one side while the other is unpowered produces the defined default-high output state on ISO7321, which must be accounted for in upstream logic during power sequencing.
The integrated input noise filter rejects pulses shorter than the filter threshold, which improves glitch immunity but adds propagation delay. At 25 Mbps, keep traces short and matched on both sides; avoid routing high-dv/dt signals (gate-driver outputs) parallel to isolator inputs to prevent capacitive coupling that could exceed the 25 kV/us CMTI budget.
Informações de conformidade
RoHS compliant and lead-free per TI product listing. AEC-Q100 qualification applies to the ISO7321FCQDQ1 variant, not this standard part.
