ISO7721QDRQ1 - 100Mbps 3kVrms Dual Digital Isolator | TI
Артикул: ISO7721QDRQ1 ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $2.45 | $2,45 |
| 10 | $2.2 | $22,00 |
| 100 | $1.85 | $185,00 |
| 500 | $1.55 | $775,00 |
| 1.000 | $1.3 | $1.300,00 |
ISO7721QDRQ1 Обзор
A digital isolator transfers CMOS or LVCMOS logic signals across an isolation barrier, enabling ground-potential differences between circuits while blocking high voltage and noise. Digital isolators sit within the isolation and interface IC family, which spans optocouplers, magnetic couplers, and capacitive couplers; the ISO7721-Q1 belongs to TI's capacitive SiO2 isolator portfolio.
Key features include the robust double-capacitive silicon dioxide (SiO2) insulation barrier that provides reinforced isolation with high electromagnetic immunity and low emissions at low power consumption. The AEC-Q100 qualification targets automotive environments such as battery management systems (BMS), on-board chargers, and DC-DC converters. In the event of input power or signal loss, the default output is high for devices without the F suffix and low for devices with the F suffix.
Architecturally, each isolation channel consists of a logic input and output buffer separated by a double capacitive silicon dioxide insulation barrier. This on-chip SiO2 barrier provides high field strength and stable isolation over lifetime, with superior CMTI (85 kV/us) and EMC performance compared to optocoupler-based solutions.
Typical applications include automotive BMS cell-monitoring isolation, isolated CAN and RS-485 communication front ends, isolated gate-drive signaling in traction inverters and on-board chargers, and industrial PLC digital I/O isolation. Pairing with isolated power modules such as the UCC25800-Q1 completes a fully isolated signal and power chain.
Design consideration: verify supply voltage range and default-output behavior (high vs F-suffix low) against fail-safe requirements; pricing below is as of 2026-08-29.
Аналоги без доработки для ISO7721QDRQ1 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с ISO7721QDRQ1 (тот же форм-фактор и посадочное место) — отличается по Package, CMTI, Isolation Rating, Number of Channels, RoHS Status.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
ISO7721DR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ISO7721FDR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ISO7721FQDRQ1
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADUM1201ARZ
✅ Прямая замена ⚠️ Характеристики не проверены✓ В наличии
$1.22 / шт.
Открыть даташит →Si8421BD
⚡ Тот же корпус ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
ISO7721QDRQ1 Характеристики
| Каналы | 2 |
| Channel Direction Configuration | 1/1 (opposite direction) |
| Isolation Rating | 3000 Vrms (D package) per UL 1577 |
| Signaling Rate | 100 Mbps |
| CMTI | 85 kV/us |
| Isolation Barrier Technology | Double capacitive silicon dioxide (SiO2) |
| Insulation Type | Reinforced |
| Qualification | AEC-Q100 qualified (automotive) |
| Default Output (input power loss) | High (no suffix F) |
| Корпус | 8-SOIC (0.154 in, 3.90 mm width), D |
| Тип монтажа | Surface Mount |
| Application Domain | Automotive: BMS, on-board charger, DC-DC converters |
| EMC Performance | High electromagnetic immunity, low emissions |
Конфигурация выводов ISO7721QDRQ1
| Контакт 1 | VCC1 — Side-1 supply voltage |
| Контакт 2 | INA — Channel A logic input (side 1) |
| Контакт 3 | GND1 — Side-1 ground reference |
| Контакт 4 | OUTB — Channel B logic output (side 1) |
| Контакт 5 | INB — Channel B logic input (side 2) |
| Контакт 6 | GND2 — Side-2 ground reference |
| Контакт 7 | OUTA — Channel A logic output (side 2) |
| Контакт 8 | VCC2 — Side-2 supply voltage |
Типичное применение
ISO7721QDRQ1 подходит для 6 применениеs: Automotive Battery Management Systems (BMS), On-Board Charger (OBC) Control Isolation, Isolated CAN/RS-485 Communication, Isolated Gate-Drive Signaling, Industrial PLC Digital I/O Isolation, Medical and Test-Equipment Signal Isolation.
Automotive Battery Management Systems (BMS)
The ISO7721QDRQ1 isolates cell-monitoring and pack-controller communication in EV battery packs, where ground potential can shift hundreds of volts between cell stacks. Its AEC-Q100 qualification and reinforced 3000 Vrms SiO2 barrier meet automotive functional-safety insulation needs, while 85 kV/us CMTI keeps 100 Mbps signaling intact across contactor switching and inverter dv/dt events. The default-high output signals a defined fail-safe state if side-1 power drops. Place it between the BQ79716B-Q1 cell monitor and the pack MCU with local 3.3V or 5V rails and 100 nF decoupling on both grounds.
Рекомендуется
On-Board Charger (OBC) Control Isolation
In on-board chargers, the low-voltage control domain must be galvanically isolated from the high-voltage PFC and DC-DC power stage. The ISO7721QDRQ1 transfers PWM enable and fault-feedback signals in opposite directions across the barrier at up to 100 Mbps with no optocoupler aging or current-transfer-ratio degradation. Its low emissions simplify EMI filter design near switching stages, and the 3000 Vrms reinforced rating supports the required working and transient isolation. Pair with the UCC21710-Q1 isolated gate driver on the power-stage side for a complete isolation chain.
Рекомендуется
Isolated CAN/RS-485 Communication
Industrial and automotive networks benefit from isolating the transceiver from the host controller to break ground loops and block transients. The ISO7721QDRQ1's 1/1 opposite-direction channels match the TX/RX flow of a CAN or RS-485 transceiver with a host-side enable or wake line, sustaining 100 Mbps for fast protocols. With 85 kV/us CMTI, it survives common-mode surges on long cables that would corrupt non-isolated links. Place it between the MCU and a TCAN1051-Q1 or TCAN337G-Q1 transceiver, with both grounds referenced to their local domains.
Рекомендуется
Isolated Gate-Drive Signaling
For SiC and IGBT inverter stacks, the ISO7721QDRQ1 carries PWM commands from the controller to isolated gate-driver inputs and returns fault/desat feedback in the opposite direction, matching its 1/1 channel layout. The 85 kV/us CMTI exceeds typical dv/dt of fast SiC switching, preventing false pulses across the barrier during millivolt-per-nanosecond transients. Its reinforced SiO2 barrier provides the insulation coordination needed for high-bus-voltage stacks. Feed UCC21520 or UCC21540 gate drivers on the isolated side with 3.3V or 5V logic through this isolator.
Рекомендуется
Industrial PLC Digital I/O Isolation
PLC modules isolate field wiring from the logic CPU to survive wiring faults, ground differences, and induced transients. The ISO7721QDRQ1's 100 Mbps rate covers fast counter and encoder inputs, while its reinforced 3000 Vrms rating provides durable insulation across the field/logic boundary. Unlike optocouplers, the capacitive SiO2 barrier avoids CTR aging, extending module service life and reducing calibration drift. Use it on isolated input cards alongside the SN74HC21-Q1 gating logic and TXS0102-Q1 level translators on the controller side.
Рекомендуется
Medical and Test-Equipment Signal Isolation
Patient-connected and high-voltage test instruments require reinforced isolation between front-end acquisition and back-end processing. The ISO7721QDRQ1's reinforced SiO2 barrier, 100 Mbps throughput, and low emissions make it fit for isolating ADC control lines and status returns without adding switching noise to sensitive analog front ends. Its default-high fail-safe output supports safety logic that must assert a defined state if the isolated side loses power. Combine with the ADS127L11 or ADS1220 precision ADCs and TMCS1101-Q1 isolated current sensing in the acquisition chain.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ISO7721QDRQ1 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ISO7721DR | ISO7721FDR | ADuM1201ARZ | Si8421BD |
|---|---|---|---|---|---|
| Package | 8-SOIC (D, 3.90 mm) | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Skyworks Solutions |
| Automotive Qualification | AEC-Q100 qualified | No (industrial) | No (industrial) | No | No |
| Channel Configuration | 2ch, 1/1 opposite | 2ch, 1/1 opposite | 2ch, 1/1 opposite | 2ch, 1/1 (verify) | 2ch (verify directionality) |
Ключевые отличия
- AEC-Q100 automotive qualification with reinforced insulation (против ISO7721DR)
- Default-high fail-safe output (против ISO7721FDR)
- 85 kV/us CMTI at 100 Mbps (против ADuM1201ARZ)
Заметки по проектированию
Decouple VCC1 and VCC2 with 100 nF ceramic capacitors placed within 2 mm of each pin, referenced to their local GND1/GND2 planes. Keep a clear creepage and clearance gap between side-1 and side-2 copper under the isolator; never route traces across the barrier region of the SOIC-8 footprint. Per TI ISO772x-Q1 datasheet layout guidance, maintain the minimum spacing required by your reinforced-insulation safety standard on both PCB layers.
Do not confuse directionality: ISO7721-Q1 channels run in opposite directions (1/1) while ISO7720-Q1 runs both the same direction. Also confirm default-output behavior - ISO7721QDRQ1 defaults high on input power loss; if your fail-safe logic needs low, order ISO7721FQDRQ1. Si8621 shares the SOIC-8 package but has reversed pin definitions and cannot be swapped without PCB review.
The capacitive SiO2 barrier produces far lower radiated emissions than optocouplers, but at 100 Mbps edge rates, add 22-33 ohm series resistors at isolator outputs to control ringing on long traces. Keep the isolator close to the connector or transceiver it drives, and route the two ground domains as separate planes joined only through the intended isolation gap to preserve CMTI performance of 85 kV/us.
Информация о соответствии
AEC-Q100 qualified for automotive per TI product page. UL 1577 isolation rating 3000 Vrms (D package). RoHS/REACH status not present in provided data - verify on TI product page.
