ISO7761DBQR - 6-Ch 5/1 Digital Isolator 3kVrms 100Mbps | TI
N.º de pieza: ISO7761DBQR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.42 | $3,42 |
| 10 | $3.07 | $30,70 |
| 100 | $2.58 | $258,00 |
| 500 | $2.21 | $1.105,00 |
| 1.000 | $1.84 | $1.840,00 |
ISO7761DBQR Descripción general
A digital isolator is a galvanic isolation device that transfers logic signals across a safety isolation barrier using capacitive or magnetic coupling rather than an optocoupler LED. This topology eliminates the aging, CTR degradation, and slow propagation of optocouplers while meeting reinforced insulation ratings. In the system hierarchy, the ISO7761 sits between a logic-level controller (MCU, FPGA, ASIC) and a high-voltage or noisy domain (gate driver, sensor, communication bus), protecting low-voltage silicon from ground-potential differences and fast transients on the field side.
Key features include wide 2.25 V to 5.5 V supply range on both sides, default low outputs, low 1.7 mA per channel typical quiescent current at 1 Mbps, and 100 Mbps NRZ signaling with < 12 ns typical propagation delay. The device is certified per UL 1577, IEC 60747-17 (VDE), CSA, TUV, and CQC for reinforced insulation, with 3000 Vrms working voltage (DBQ package) and 5000 Vrms (DW package variant). The SSOP-16 (DBQ) footprint is 5 mm x 4 mm, ideal for compact designs.
Internally, the ISO7761 uses TI's silicon-oxide (SiO2) capacitive isolation barrier with on-off keying modulation and differential signaling across the barrier. A refresh circuit on each side periodically re-drives the output to maintain DC accuracy. The high CMTI of 85 kV/us ensures the output does not glitch during fast switching events such as IGBT/MOSFET transitions in motor drive and solar inverter applications.
Typical applications include industrial fieldbus isolation (RS-485, CAN, SPI), isolated gate driving for IGBT/MOSFET half-bridges, isolated ADC/DAC signal chains, PLC I/O modules, solar inverter control boards, and medical equipment patient isolation. The wide supply range allows direct interfacing to 3.3 V and 5 V MCUs without level translation.
When designing with this device, ensure adequate decoupling on both VCC1 and VCC2 (typically 0.1 uF plus 1 uF bulk) placed within 2 mm of the supply pins. Maintain the creepage and clearance required by your end-equipment safety standard, and confirm that the DBQ package's 8 mm clearance meets your reinforced-insulation voltage needs (use the DW package for 5000 Vrms).
This page synthesizes distributor pricing, drop-in alternative cross-references, and practical EMC/layout design notes not aggregated on a single manufacturer or distributor page.
Alternativas directas para ISO7761DBQR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ISO7761DBQR (mismo factor de forma y huella) — difiere en Package, Channel Configuration, MSL Level, Number of Channels, Common-Mode Transient Immunity (CMTI).
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ISO7761DBQ
✅ Sustitución directa✓ En stock
$1.84 / unidad
Ver hoja de datos →ISO7761FDBQR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISO7742DBQR
✅ Sustitución directa✓ En stock
$2.1 / unidad
Ver hoja de datos →ISO7741DBQR
✅ Sustitución directa✓ En stock
$1.85 / unidad
Ver hoja de datos →ISO7041FDBQR
✅ Sustitución directa✓ En stock
$2.4879 / unidad
Ver hoja de datos →ISO7761DBQR Especificaciones
| Isolation Rating (UL 1577) | 3000 Vrms (DBQ package) |
| Number of Channels | 6 (5 forward / 1 reverse) |
| Channel Configuration | 5/1 |
| Maximum Data Rate | 100 Mbps |
| Common-Mode Transient Immunity (CMTI) | 85 kV/us (minimum) |
| Supply Voltage Range (both sides) | 2.25 V to 5.5 V |
| Quiescent Current per Channel (typical) | 1.7 mA at 1 Mbps |
| Default Output State | Low |
| Rango de temperatura de funcionamiento | -55 C to +125 C |
| Encapsulado | 16-SSOP (DBQ), 0.154" (3.90 mm) width |
| Tipo de montaje | Surface Mount |
| Nivel MSL | 2 (260 C, 1 year) |
| Estado RoHS | Compliant |
| Safety Certifications | UL 1577, IEC 60747-17 (VDE), CSA, TUV, CQC |
| Isolation Barrier Technology | Capacitive (SiO2) |
Configuración de pines de ISO7761DBQR
| Pin 1 | VCC1 — Side-1 power supply, 2.25 V to 5.5 V |
| Pin 2 | GND1 — Side-1 ground return |
| Pin 3 | INA — Input channel A (side 1 to side 2) |
| Pin 4 | OUTA — Output channel A (side 1 to side 2) |
| Pin 5 | INB — Input channel B (side 1 to side 2) |
| Pin 6 | OUTB — Output channel B (side 1 to side 2) |
| Pin 7 | INC — Input channel C (side 1 to side 2) |
| Pin 8 | OUTC — Output channel C (side 1 to side 2) |
| Pin 9 | GND1 — Side-1 ground return |
| Pin 10 | IND — Input channel D (side 1 to side 2) |
| Pin 11 | OUTD — Output channel D (side 1 to side 2) |
| Pin 12 | INE — Input channel E (side 1 to side 2) |
| Pin 13 | OUTE — Output channel E (side 1 to side 2) |
| Pin 14 | NC — Not connected (reserved, leave open per datasheet) |
| Pin 15 | GND2 — Side-2 ground return (isolated from GND1) |
| Pin 16 | VCC2 — Side-2 power supply, 2.25 V to 5.5 V |
Aplicaciones típicas
ISO7761DBQR es adecuado para 7 aplicacións: Isolated SPI Interface for Industrial MCUs, Isolated RS-485 / CAN Transceiver Interface, Isolated IGBT/MOSFET Gate Driver Signal Path, PLC and Industrial I/O Module Isolation, Isolated ADC/DAC Front-End for Data Acquisition, Medical Equipment Patient-Isolated Signal Path, Solar Inverter Control Board Isolation.
Isolated SPI Interface for Industrial MCUs
The ISO7761DBQR's 5/1 channel configuration maps directly to SPI signals (SCLK, MOSI, MISO, plus 2 CS lines and 1 interrupt/return) without requiring multiple isolator ICs. At 100 Mbps the part supports SPI up to ~50 MHz while maintaining reinforced 3000 Vrms isolation per UL 1577. In motor-control and PLC designs, placing the ISO7761DBQR between the MCU and a high-side gate-driver ASIC eliminates ground-potential differences across the isolation barrier. The 85 kV/us CMTI ensures the output does not glitch during IGBT switching events. Decouple both VCC1 and VCC2 within 2 mm of the supply pins using 0.1 uF + 1 uF ceramic capacitors.
Recomendado
Isolated RS-485 / CAN Transceiver Interface
The ISO7761DBQR is well-suited for isolating RS-485 or CAN transceivers where the bus side may sit at a different ground potential than the controller. Its 100 Mbps data rate exceeds the needs of CAN (1 Mbps) and RS-485 (10-50 Mbps) by a comfortable margin, and the 85 kV/us CMTI prevents bus faults from corrupting isolated logic. Use 2 channels for differential data, 1 channel for direction control, and remaining channels for flow control or enable signals. The 2.25 V to 5.5 V supply range on each side allows direct connection to 3.3 V MCUs and 5 V transceivers without level shifters.
Recomendado
Isolated IGBT/MOSFET Gate Driver Signal Path
For solar inverters, motor drives, and UPS systems, the ISO7761DBQR can isolate the PWM logic signals feeding a gate driver such as the ISO5851 or UCC21750. Its 85 kV/us minimum CMTI is critical because IGBT turn-on events produce fast common-mode edges that lower-rated isolators cannot reject. The reinforced 3000 Vrms insulation rating meets end-equipment safety standards for industrial motor drives. Place the ISO7761DBQR as close as possible to the gate driver inputs to minimize high-dv/dt loop area, and add a 0.1 uF + 10 uF decoupling network on each VCC pin.
Recomendado
PLC and Industrial I/O Module Isolation
The ISO7761DBQR enables compact isolated digital I/O modules in PLC systems by providing 6 channels in a single SSOP-16 package. The 5/1 channel split suits inputs-with-feedback or output-with-fault architectures common in 24 V industrial field wiring. Reinforced 3000 Vrms isolation per UL 1577 meets IEC 61131-2 requirements for industrial control equipment. The wide 2.25 V to 5.5 V supply range interfaces directly to 24 V-tolerant logic through external buffers, simplifying BOM. Use the device with TVS-protected field-side wiring for transient surge immunity per IEC 61000-4-2 and -4-5.
Recomendado
Isolated ADC/DAC Front-End for Data Acquisition
Data-acquisition systems often require isolation between the analog front-end (sensor-side) and the digital controller to reject ground loops and protect downstream electronics. The ISO7761DBQR can carry SPI, LVDS, or parallel ADC/DAC control signals at 100 Mbps while maintaining 3000 Vrms reinforced isolation. Pair the ISO7761DBQR with a precision ADC such as the ADS131M04 on the field side and an MCU on the controller side. The capacitive SiO2 barrier exhibits long-term stability and is immune to the LED-aging problems of optocouplers, ensuring 10+ year calibration stability in industrial instrumentation.
Recomendado
Medical Equipment Patient-Isolated Signal Path
The ISO7761DBQR is certified under UL, VDE, CSA, TUV, and CQC for reinforced insulation, making it suitable for patient-connected medical equipment requiring IEC 60601-1 isolation. Its capacitive SiO2 barrier eliminates optocoupler LED aging concerns critical for 10+ year medical device service life. The 5/1 channel split suits patient-monitoring signal paths (multiple ECG leads plus one return). Use the device with a certified isolated DC-DC converter such as the ISO7041FDBQR family to provide reinforced-isolated power to the patient-side circuitry, completing the isolation barrier.
Recomendado
Solar Inverter Control Board Isolation
In string inverters and microinverters, the ISO7761DBQR isolates the low-voltage control MCU from the high-voltage DC-bus and grid-side power stages. The 3000 Vrms reinforced insulation rating satisfies IEC 62109 safety requirements for photovoltaic power converters, and 85 kV/us CMTI prevents PWM glitches during IGBT switching. The 5/1 channel split supports multiple PWM channels plus fault feedback. Place the part as close as possible to the gate driver with a wide ground return path under the isolator to minimize high-dv/dt loop area per the TI ISO7761 datasheet layout recommendations.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ISO7761DBQR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ISO7761DBQ | ISO7761FDBQR | ISO7742DBQR | ISO7741DBQR | ISO7041FDBQR |
|---|---|---|---|---|---|---|
| Package | SSOP-16 (DBQ) | SSOP-16 (DBQ) - same | SSOP-16 (DBQ) - same | SSOP-16 (DBQ) - same | SSOP-16 (DBQ) - same | SSOP-16 (DBQ) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Number of Channels | 6 | 6 | 6 | 4 | 4 | 4 (with DC-DC) |
| Channel Direction | 5/1 | 5/1 | 5/1 | 2/2 | 3/1 | 3/1 + DC-DC |
| Isolation Voltage (UL 1577) | 3000 Vrms | 3000 Vrms | 3000 Vrms | 3000 Vrms | 3000 Vrms | 3000 Vrms |
| Integrated Isolated DC-DC | No | No | No | No | No | Yes |
Diferenciadores clave
- Higher channel count in same SSOP-16 footprint (frente a ISO7741DBQR)
- Standard default-low vs default-high variant (frente a ISO7761FDBQR)
- Pure isolator without integrated DC-DC (frente a ISO7041FDBQR)
- Reinforced 3000 Vrms isolation per UL 1577 (frente a ISO7742DBQR)
Notas de diseño
Place 0.1 uF and 1 uF ceramic decoupling capacitors within 2 mm of each VCC1 (pin 1) and VCC2 (pin 16) supply pin. Maintain a continuous ground plane on each side of the isolation barrier with no copper traces crossing the barrier. The DBQ SSOP-16 package provides 4 mm clearance across the isolation barrier per the TI ISO7761 datasheet; confirm this meets your end-equipment standard (use the DW package for 8 mm clearance).
Minimize loop area on high-dv/dt nodes by keeping the gate-driver and ISO7761DBQR physically close. Route the input/output traces adjacent to their ground returns to control impedance and reduce emissions. Avoid running digital signals on the field side directly under the isolator to prevent coupling into the barrier. Per the TI ISO7761 datasheet layout guidelines, add stitching capacitors between GND1 and GND2 regions only if your safety standard permits Y-capacitive coupling across the barrier.
The capacitive SiO2 isolation barrier in the ISO7761DBQR exhibits common-mode currents proportional to dv/dt at the barrier. Place a ferrite bead on the VCC2 supply trace near the isolator, and ensure field-side ground is referenced close to the isolator's GND2 pin. For IEC 61000-4-2/4-5 surge immunity on field-side lines, add external TVS diodes at the connector. The 85 kV/us CMTI of the ISO7761DBQR is sufficient for most motor-drive and solar-inverter switching environments per the TI datasheet.
Do not load VCC1 or VCC2 with more than 10 uF bulk capacitance without consulting the datasheet's soft-start behavior. Ensure the input channels are not left floating when the corresponding VCC is present, as floating inputs can draw excess current and cause output oscillation. For default-low variants like the ISO7761DBQR, verify that downstream drivers tolerate the low output state during power-up. Use the F-version (default-high) when the safe state requires high output, such as for active-low enable gate drivers.
Información de cumplimiento
RoHS compliant per TI product page. Reinforced insulation certified under UL 1577 (3000 Vrms), IEC 60747-17 (VDE), CSA, TUV, and CQC. Not AEC-Q100 qualified; not applicable for digital isolators without automotive-grade variant in this part number.
