ISO7721QDRQ1 - 100Mbps 3kVrms Dual Digital Isolator | TI
MPN: ISO7721QDRQ1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 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 |
Drop-in alternatives for ISO7721QDRQ1 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ISO7721DR
β Drop-Inπ Reference alternative (not in catalog)
ISO7721FDR
β Drop-Inπ Reference alternative (not in catalog)
ISO7721FQDRQ1
β Drop-Inπ Reference alternative (not in catalog)
ADUM1201ARZ
β Drop-Inβ In Stock
$1.22 / Unit
View Datasheet βSi8421BD
β‘ Same Packageπ Reference alternative (not in catalog)
ISO7721QDRQ1 Maximum Ratings & Electrical Characteristics
| Channels | 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) |
| Supply Voltage | [DATA_NEEDED: supply voltage range] |
| Package | 8-SOIC (0.154 in, 3.90 mm width), D |
| Mounting Type | Surface Mount |
| Operating Temperature | [DATA_NEEDED: operating temperature range] |
| Application Domain | Automotive: BMS, on-board charger, DC-DC converters |
| EMC Performance | High electromagnetic immunity, low emissions |
| RoHS Status | [DATA_NEEDED: RoHS status] |
ISO7721QDRQ1 Pin Configuration
| Pin 1 | VCC1 β Side-1 supply voltage |
| Pin 2 | INA β Channel A logic input (side 1) |
| Pin 3 | GND1 β Side-1 ground reference |
| Pin 4 | OUTB β Channel B logic output (side 1) |
| Pin 5 | INB β Channel B logic input (side 2) |
| Pin 6 | GND2 β Side-2 ground reference |
| Pin 7 | OUTA β Channel A logic output (side 2) |
| Pin 8 | VCC2 β Side-2 supply voltage |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
ISO7721QDRQ1 is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for ISO7721QDRQ1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
| Isolation Rating | 3000 Vrms | 3000 Vrms | 3000 Vrms | 2500 Vrms [DATA_NEEDED] | 2500 Vrms [DATA_NEEDED] |
| Data Rate | 100 Mbps | 100 Mbps | 100 Mbps | [DATA_NEEDED] | [DATA_NEEDED] |
| CMTI | 85 kV/us | 85 kV/us | 85 kV/us | [DATA_NEEDED] | [DATA_NEEDED] |
| Automotive Qualification | AEC-Q100 qualified | No (industrial) | No (industrial) | No | No |
| Default Output (input loss) | High | High | Low | [DATA_NEEDED] | [DATA_NEEDED] |
| Channel Configuration | 2ch, 1/1 opposite | 2ch, 1/1 opposite | 2ch, 1/1 opposite | 2ch, 1/1 (verify) | 2ch (verify directionality) |
Key Differentiators
- AEC-Q100 automotive qualification with reinforced insulation (vs ISO7721DR)
- Default-high fail-safe output (vs ISO7721FDR)
- 85 kV/us CMTI at 100 Mbps (vs ADuM1201ARZ)
Design Notes
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.
Compliance Information
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.
