ISO7742FDBQR - 100Mbps 4-Ch Reinforced Digital Isolator | TI
N.º da peça: ISO7742FDBQR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.2 | $320,00 |
| 500 | $2.72 | $1.360,00 |
| 1.000 | $2.35 | $2.350,00 |
ISO7742FDBQR Visão geral
A digital isolator is a component that transmits digital signals across a galvanic isolation barrier, protecting low-voltage circuitry and users from high voltages, ground loops, and common-mode noise. Within the interface-IC hierarchy, it sits between signal-chain ICs and hostile environments, complementing isolated power converters and isolated transceivers in industrial systems. The ISO7742FDBQR belongs to TI's ISO774x family, which uses an on-chip capacitive isolation structure with an oxide barrier, achieving reinforced isolation rated at 3000 Vrms.
Key features include a common-mode transient immunity (CMTI) of 85 kV/us minimum, low power consumption, default-output (F suffix) fail-safe behavior that drives outputs low when the input side is unpowered, and a projected barrier lifetime exceeding 30 years at rated working voltage. The device is characterized from -55C to +125C, covering extended industrial and automotive-adjacent environments.
Technically, the ISO7742FDBQR encodes input transitions across the capacitive barrier and decodes them on the secondary side, achieving sub-100 Mbps signaling with low propagation delay and low channel-to-channel skew without optocoupler aging effects. Its robust-EMC construction provides high immunity to surge and fast transient events typical of motor-drive and inverter environments.
Typical applications include isolated SPI/UART interfaces, industrial fieldbus communication, motor drives and power inverters, and isolated ADC signal paths in renewable-energy systems. Pair it with devices such as the AMC1306M25 or ISO1042 for complete isolated measurement and communication chains.
Design tip: maintain datasheet creepage and clearance on the PCB under the isolation barrier, avoid traces crossing the gap, and place 0.1uF decoupling capacitors close to both VCCI and VDD pins to preserve EMC performance.
Alternativas drop-in para ISO7742FDBQR — 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 ISO7742FDBQR (mesmo formato e footprint) — diferindo em Package, Number of Channels, Isolation Rating, Data Rate, Operating Temperature Range.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ISO7742FDBQ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISO7742DBQR
✅ Drop-In✓ Em estoque
$2.1 / unidade
Ver ficha técnica →ISO7742QFDBQRQ1
✅ Drop-In✓ Em estoque
$1.48 / unidade
Ver ficha técnica →ISO7741FDBQR
⚡ Mesmo encapsulamento✓ Em estoque
$0.98 / unidade
Ver ficha técnica →Si8442BB-B-IS1
⚡ Mesmo encapsulamento ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ISO7742FDBQR Especificações
| Isolation Type | Reinforced (robust-EMC) |
| Isolation Rating | 3000 Vrms |
| Number of Channels | 4 (2 forward / 2 reverse) |
| Max Data Rate | 100 Mbps |
| CMTI | 85 kV/us minimum |
| Supply Voltage Range (VCCI) | 2.25 V to 5.5 V |
| Supply Voltage Range (VDD) | 2.25 V to 5.5 V |
| Fail-Safe Output | Default low (F suffix) |
| Temperatura de operação | -55C to +125C |
| Encapsulamento | 16-SSOP (DBQ), 3.90 mm width |
| Tipo de montagem | Surface Mount |
| Isolation Technology | Capacitive (oxide barrier) |
| Barrier Lifetime | > 30 years at rated working voltage |
| Integrated Isolated Power | No |
| Rating | Catalog |
| Series | ISO774x |
Configuração de pinos do ISO7742FDBQR
| Pino 1 | VCCI — Input-side supply, 2.25 V to 5.5 V |
| Pino 2 | GND1 — Input-side ground |
| Pino 3 | A1 — Channel 1 input (forward) |
| Pino 4 | A2 — Channel 2 input (forward) |
| Pino 5 | B1 — Channel 1 output (reverse, input on side 2) |
| Pino 6 | B2 — Channel 2 output (reverse, input on side 2) |
| Pino 7 | NC — No connect - maintain isolation gap |
| Pino 8 | NC — No connect - maintain isolation gap |
| Pino 9 | NC — No connect - maintain isolation gap |
| Pino 10 | B3 — Channel 3 input on side 2 / output arrangement per 2/2 config |
| Pino 11 | NC — No connect |
| Pino 12 | Y1 — Channel 1 output (forward) |
| Pino 13 | Y2 — Channel 2 output (forward) |
| Pino 14 | A3 — Reverse channel input on side 1 |
| Pino 15 | GND2 — Output-side ground |
| Pino 16 | VDD — Output-side supply, 2.25 V to 5.5 V |
Aplicações típicas
ISO7742FDBQR é adequado para 6 aplicaçãos: Isolated SPI and UART Interfaces, Motor Drives and Power Inverters, Isolated ADC Signal Chains in Solar and Energy Systems, Industrial Fieldbus and PLC Communication, Test and Measurement Equipment, Battery Management Systems.
Isolated SPI and UART Interfaces
The ISO7742FDBQR fits isolated microcontroller communication links where its 100 Mbps data rate covers even the fastest SPI clocks, while the 2-forward/2-reverse channel split maps naturally to SPI (SCLK, MOSI forward; MISO, CS reverse) or UART TX/RX links. Independent 2.25V-5.5V supplies on each side allow direct 3.3V-to-5V level translation across the barrier. The 85 kV/us CMTI keeps data intact near switching converters, and default-low fail-safe outputs prevent spurious bytes when either side powers down. Place isolator channels close to the MCU and use series resistors on long traces to control signal integrity.
Recomendado
Motor Drives and Power Inverters
In motor-drive and inverter gate-drive feedback paths, the ISO7742FDBQR's 85 kV/us minimum CMTI tolerates the extreme dv/dt generated by IGBT and SiC switching edges that corrupt lower-CMTI optocouplers. Its robust-EMC construction resists surge and fast-transient events typical of these environments, while 3000 Vrms reinforced isolation protects low-voltage control electronics. Use the fail-safe F variant so gate-controller outputs default low when the control supply is absent, ensuring safe inverter shutdown. Keep the isolation gap clear of high-dv/dt copper and reference both grounds locally to minimize common-mode coupling.
Recomendado
Isolated ADC Signal Chains in Solar and Energy Systems
Solar string inverters and battery-storage systems require isolated measurement of high-voltage DC buses. The ISO7742FDBQR carries digital data from isolated ADCs such as the AMC1306M25 back to the controller with 100 Mbps headroom for high-sample-rate sigma-delta bitstreams. Its capacitive oxide barrier offers a projected lifetime exceeding 30 years at rated working voltage, matching renewable-energy product lifetimes, and -55C to +125C operation covers outdoor enclosure conditions. Route the isolator's data channels differentially short distances and add common-mode chokes on long cable-side connections to pass EMC standards.
Recomendado
Industrial Fieldbus and PLC Communication
For RS-485, CAN, and other industrial fieldbus nodes, the ISO7742FDBQR isolates controller logic from bus transceivers, breaking ground loops in long cable runs common in factory automation. The 2/2 channel arrangement supports TX/RX plus enable/direction signals, and the 85 kV/us CMTI withstands transients induced by nearby contactors and drives. Fail-safe outputs keep the transceiver direction predictable during power-up sequencing. Pair with an isolated transceiver such as the ISO1050 or ISO1042 for a complete isolated bus node rated to the same 3000 Vrms class, and provide solid functional ground planes on both sides.
Recomendado
Test and Measurement Equipment
Bench instruments, data-acquisition front ends, and programming fixtures use the ISO7742FDBQR to isolate sensitive measurement circuitry from PC or controller grounds, eliminating ground-loop-induced offset errors. The 100 Mbps rate supports parallel digital sample streaming, while low channel-to-channel skew preserves timing accuracy in multi-channel acquisition. Wide -55C to +125C characterization simplifies derating analysis for calibration-stable designs. Because TI's capacitive isolators show no optocoupler-style CTR aging, isolation and timing parameters remain stable over thousands of operating hours, an important consideration for instrument service life and calibration intervals.
Recomendado
Battery Management Systems
In high-voltage battery packs for EV, storage, and industrial applications, the ISO7742FDBQR bridges communication between the isolated pack-side AFE (such as the BQ76952) and the vehicle or system controller. Reinforced 3000 Vrms isolation supports the functional-safety isolation requirements of high-voltage stacks, and fail-safe outputs ensure deterministic communication-line states when either domain is unpowered. The wide 2.25V-5.5V supply range interfaces directly with 3.3V pack electronics and 5V controllers. Verify creepage slotting under the DBQ package on the pack PCB to preserve reinforced-isolation ratings in humid, polluted environments.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ISO7742FDBQR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ISO7742FDBQ | ISO7742DBQR | ISO7742QFDBQRQ1 | ISO7741FDBQR | Si8442BB-B-IS1 |
|---|---|---|---|---|---|---|
| Package | 16-SSOP (DBQ), 3.90 mm | 16-SSOP (DBQ) - same | 16-SSOP (DBQ) - same | 16-SSOP (DBQ) - same | 16-SSOP (DBQ) - same | SOIC-16 - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Skyworks Solutions |
| Isolation Rating | 3000 Vrms (reinforced) | 3000 Vrms | 3000 Vrms | 3000 Vrms | 3000 Vrms | 2500 Vrms |
| Channels (Fwd/Rev) | 4 (2/2) | 4 (2/2) | 4 (2/2) | 4 (2/2) | 3 (2/1) | 4 (2/2) |
| Max Data Rate | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps |
| Automotive Grade | No (catalog) | No | No | Yes (Q1, AEC-Q100) | No | No |
Principais diferenciais
- Default-low fail-safe outputs (vs ISO7742DBQR)
- 100 Mbps speed with reinforced 3000 Vrms isolation (vs Si8442BB-B-IS1)
- Automotive upgrade path in the same footprint (vs ISO7742QFDBQRQ1)
Notas de projeto
Preserve the isolation barrier on the PCB: keep the zone beneath and around the DBQ package free of any copper, traces, or vias connecting side 1 to side 2, and maintain the datasheet creepage and clearance distances. Slots in the PCB can increase creepage in humid or polluted environments where reinforced isolation must be maintained. Never route signals across the gap; use only the internal isolation barrier of the device to cross domains.
Decouple VCCI and VDD independently with 0.1uF ceramic capacitors placed within 2 mm of each pin, plus a 1uF bulk capacitor per side. Each side may operate from any voltage in the 2.25V to 5.5V range independently, enabling 3.3V-to-5V translation, but both supplies must be present within datasheet timing requirements for defined output states. With the F (fail-safe) device, outputs default low if the input-side supply is absent.
In motor-drive and inverter environments, the 85 kV/us CMTI rating is preserved only with good layout: minimize loop areas on both sides, locate the isolator close to the noise source boundary, and avoid running high-dv/dt nodes (switch nodes, gate traces) parallel to isolator signal traces. For radiated emissions, note that capacitive isolators inject small common-mode currents across the barrier - a common-mode choke or ferrite on interconnect cables typically resolves compliance issues.
Informações de conformidade
RoHS/lead-free status per TI product page for catalog DBQ package. AEC-Q100 qualification applies only to ISO7742QFDBQRQ1 variant; catalog ISO7742FDBQR is not Q-qualified.
