ISO7761DW - 6-Ch 100Mbps Reinforced Digital Isolator | TI
MPN: ISO7761DW ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.92 | $4.92 |
| 10 | $4.43 | $44.30 |
| 100 | $3.94 | $394.00 |
| 500 | $3.54 | $1,770.00 |
| 1,000 | $3.15 | $3,150.00 |
| 3,000 | $2.78 | $8,340.00 |
ISO7761DW Overview
An digital isolator is a semiconductor device that transfers data across an galvanically-isolated barrier using on-chip transformers, RF coupling, or optical encoding, while blocking high-voltage transients and ground-potential differences. Within the broader signal-chain taxonomy, digital isolators sit under interface ICs (functional class: isolators) and replace legacy optocouplers where higher speed, lower power, tighter CMTI, and integrated multi-channel packaging are required. The ISO776x family targets applications that previously needed 6 separate optocouplers.
Key differentiating specifications include reinforced 5000 Vrms isolation (DW-16 package), 100 Mbps per-channel signaling, 85 kV/µs CMTI to survive fast switching transients on long motor or bus cables, and ±8 kV HBM ESD on all pins. The wide-body SOIC-16 (7.5 mm creepage) provides the clearance and creepage distances required by IEC 60747-17 (VDE 0884-17) for reinforced working voltage up to 1500 Vpk / 2121 Vpk (per datasheet). Integrated fail-safe default-low or default-high outputs (variant dependent) eliminate external pull resistors.
The ISO7761 uses TI's CMOS-based silicon-dioxide capacitive-isolation barrier with on-die edge encoding/decoding, delivering stable channel-to-channel skew of < 5 ns and >100 V/ns dV/dt tolerance. Internally, two separate grounds (GND1 and GND2) allow reference domains on opposite sides of the isolation barrier; power converters on each side are typically bootstrapped with a transformer-driver plus an LDO (e.g., SN6505B + TPS7A47) or a TI integrated isolated DC/DC module.
Typical applications include isolated SPI/RS-485/RS-232 interfaces for factory automation, isolated gate drivers for IGBT/MOSFET half-bridges in motor drives and solar inverters, isolated ADC/DAC front-ends for grid protection relays, and battery-management system (BMS) communication in 400 V / 800 V EV traction packs. The reinforced 5000 Vrms rating qualifies it for use across the isolation boundary in medical (IEC 60601-1) and energy-storage (IEC 62933) equipment.
When designing with the ISO7761DW, place 0.1 µF bypass capacitors on VCC1 and VCC2 within 2 mm of the device pins, respect the 8 mm minimum creepage on the PCB surface, and ensure the upstream MCU logic-level matches VCCx (2.25 V to 5.5 V). The default-output polarity should be selected to match system reset behavior — ISO7761 (suffix-F) offers default-high for fail-safe high-side driving.
This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ISO7761DW — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ISO7761DW (same form factor and footprint) — differing in Package, Common-Mode Transient Immunity (CMTI), Number of Channels, Maximum Data Rate, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISO7761DWR
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7761FDW
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7760DW
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7762DW
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7741DW
✅ Drop-In📋 Reference alternative (not in catalog)
ADuM160N0BRZ
✅ Drop-In📋 Reference alternative (not in catalog)
Si8621BB-B-IS
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7761DW Specifications
| Number of Channels | 6 (5 forward / 1 reverse) |
| Data Rate (max) | 100 Mbps |
| Isolation Rating (DW package) | 5000 Vrms (per UL 1577) |
| Common-Mode Transient Immunity (CMTI) | 85 kV/µs (minimum) |
| Supply Voltage (VCC1, VCC2) | 2.25 V to 5.5 V |
| Quiescent Current per Channel (typ @1 Mbps) | 1.5 mA |
| Propagation Delay (typ) | 11 ns |
| Channel-to-Channel Skew | 5 ns (max) |
| ESD Rating (HBM) | ±8 kV |
| Operating Temperature Range | -55 °C to +125 °C |
| Package | 16-SOIC (DW), 0.295" / 7.50 mm body width |
| Default Output | Low (ISO7761) / High (ISO7761F) |
| Moisture Sensitivity Level (MSL) | 2 (1 year floor life) |
| RoHS Status | Compliant |
| Certifications | UL 1577, VDE (IEC 60747-17), CSA, TUV, CQC (per TI datasheet) |
| Isolation Technology | CMOS capacitive (SiO2 dielectric) |
ISO7761DW Pin Configuration
| Pin 1 | INA — Channel 1 input (side 1) |
| Pin 2 | GND1 — Ground reference for side-1 supply |
| Pin 3 | VCC1 — Side-1 supply voltage, 2.25 V to 5.5 V |
| Pin 4 | EN1 — Side-1 enable (high = enabled; tie high if unused) |
| Pin 5 | OUTA — Channel 1 output (side 1) |
| Pin 6 | INB — Channel 2 input (side 1) |
| Pin 7 | OUTB — Channel 2 output (side 1) |
| Pin 8 | OUTC — Channel 3 output (side 1) |
| Pin 9 | INC — Channel 3 input (side 1) |
| Pin 10 | OUTD — Channel 4 output (side 1) |
| Pin 11 | IND — Channel 4 input (side 1) |
| Pin 12 | GND2 — Ground reference for side-2 supply |
| Pin 13 | EN2 — Side-2 enable (high = enabled; tie high if unused) |
| Pin 14 | INE — Channel 5 input (side 1) |
| Pin 15 | VCC2 — Side-2 supply voltage, 2.25 V to 5.5 V |
| Pin 16 | OUTE / IN_F — Channel 5 output (side 1) + reverse-channel input (side 2) |
Typical Applications
ISO7761DW is suitable for 7 applications: Isolated SPI / RS-485 Industrial Fieldbus, Isolated Gate Driver for IGBT / SiC Half-Bridge, EV Battery-Management System (BMS) Isolation, Grid-Protection Relay Isolated ADC Front-End, Medical Equipment Patient-Isolated Interface, Solar Inverter Isolated Communication, Server / Telecom PSU Hot-Swap OR-ing Control.
Isolated SPI / RS-485 Industrial Fieldbus
The ISO7761DW's 100 Mbps per-channel data rate and 5/1 channel direction make it a direct fit for isolated SPI between an MCU and a remote sensor, or isolated RS-485 transceivers in factory-floor networks. Its 85 kV/µs CMTI blocks the fast dv/dt edges produced by adjacent motor inverters and 24 V solenoid switching on long bus cables, eliminating data corruption. The 5000 Vrms reinforced isolation exceeds the 2.5 kV clearance typically required by IEC 61800-5-1 for adjustable-speed drives, allowing the device to straddle the safety boundary in industrial PLCs. Pair it with an isolated DC/DC (e.g., SN6505B + transformer) to power side-2 from side-1 without a second isolated supply.
Recommended
Isolated Gate Driver for IGBT / SiC Half-Bridge
The ISO7761DW provides reinforced 5000 Vrms isolation plus 85 kV/µs minimum CMTI, which is essential when driving 1200 V IGBT or SiC FETs in motor drives and solar inverters. The fast dv/dt edges of a switching leg would couple through any weaker isolator and force a gate-driver fault; the ISO7761's CMTI comfortably survives that stress. Five forward channels can carry the high-side gate, low-side gate, fault, enable, and PWM-latch signals; the single reverse channel returns desaturation-fault feedback to the controller. The wide-body SOIC-16 provides 8 mm of creepage, the minimum typically required for reinforced working voltage up to 1500 Vpk per IEC 60747-17.
Recommended
EV Battery-Management System (BMS) Isolation
For 400 V and 800 V EV traction packs, the ISO7761DW delivers the reinforced 5000 Vrms isolation required between the high-voltage pack and the 12 V vehicle bus. The 100 Mbps data rate covers isoSPI daisy-chain communication at 1–4 Mbps with plenty of headroom for fault telemetry and diagnostics, while the 85 kV/µs CMTI prevents glitches during the 10–20 kV/µs transients that occur when contactors open or close. TI also offers the AEC-Q100-qualified variant ISO7761FQDWWQ1 for the same function in automotive designs. The 6-channel count lets one device carry enable, fault, clock, data, and two wake/sleep signals between the BMS controller and the master ECU.
Recommended
Grid-Protection Relay Isolated ADC Front-End
In protection relays that must isolate current-transformer / voltage-transformer sensing from the digital signal processor, the ISO7761DW bridges a 6-channel parallel ADC bus across the 5000 Vrms barrier. The 11 ns propagation delay and 5 ns channel-skew ensure simultaneous sampling is preserved within one ADC clock cycle at typical sample rates, while 85 kV/µs CMTI blocks switching transients from the 110/230 V mains side. The reinforced isolation rating supports IEC 60255-27 and IEC 61850-3 requirements for protection-class equipment. Combined with an isolated DC/DC module, the ISO7761DW provides a complete barrier solution in < 25 × 25 mm of PCB.
Recommended
Medical Equipment Patient-Isolated Interface
Medical devices such as patient monitors, infusion pumps and diagnostic imaging must provide reinforced 5000 Vrms isolation between patient-connected circuitry (per IEC 60601-1 Means of Patient Protection, MOPP) and the operator-side digital host. The ISO7761DW's reinforced rating and TI's documented VDE IEC 60747-17 certification give designers a pre-qualified isolation building block, and the 6-channel count fits patient-side SPI ADC, alarm, enable, watchdog, and dual heartbeat signals in a single SOIC-16. Note: a full IEC 60601-1 system qualification is still required — the isolator only contributes one isolation stage toward Means of Patient Protection.
Recommended
Solar Inverter Isolated Communication
In string inverters and central inverters, the ISO7761DW isolates the DC-DC power stage (typically 600-1500 Vdc) from the AC-grid-connected inverter stage and the low-voltage control board. The 85 kV/µs CMTI survives the fast dv/dt of the IGBT/SiC bridge, the reinforced 5000 Vrms rating supports the >2.5 kV clearance required by IEC 62109-1 for PV equipment, and the 5/1 channel direction fits the standard control card interface (PWM, fault, enable, status, plus one feedback). The wide operating temperature range -55 °C to +125 °C and 100 Mbps data rate support both low-speed CAN/Modbus and high-speed SPI inverter-control loops.
Recommended
Server / Telecom PSU Hot-Swap OR-ing Control
In -48 V datacenter and telecom power-supply units, the ISO7761DW isolates the digital hot-swap controller and I2C telemetry from the high-voltage primary side of an AC-DC or DC-DC converter. The 5/1 channel direction maps neatly to enable, PG, fault, I2C-SCL, I2C-SDA-out, plus the single reverse channel carrying I2C-SDA-back. With 85 kV/µs CMTI the device tolerates ringing on the rectified-mains bus, and the wide-body SOIC-16's 8 mm creepage supports 5000 Vrms isolation. The CMOS capacitive-isolation technology has no aging effects from partial discharge, giving it a lifetime advantage over optocouplers in always-on server PSUs.
Recommended
Recommended Products Summary
Engineering reference data for ISO7761DW — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISO7761DWR | ISO7761FDW | ISO7760DW | ADuM160N0BRZ | Si8621BB-B-IS |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Silicon Labs |
| Package | 16-SOIC (DW), wide body | 16-SOIC (DW) - same | 16-SOIC (DW) - same | 16-SOIC (DW) - same | 16-SOIC wide body - same | 16-SOIC wide body - same |
| Channels (forward/reverse) | 6 (5/1) | 6 (5/1) | 6 (5/1), default-high | 6 (6/0) | 6 (configurable direction) | 6 (5/1) |
| Isolation Voltage (rms) | 5000 V | 5000 V | 5000 V | 5000 V | 5000 V | 5000 V |
| Data Rate (max) | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 1 Mbps |
| CMTI (minimum) | 85 kV/µs | 85 kV/µs | 85 kV/µs | 85 kV/µs | 75 kV/µs | 50 kV/µs |
| Default Output | Low | Low | High | Low | Low | Low |
| Supply Voltage | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 1.8 V to 5.5 V | 2.5 V to 5.5 V |
| Operating Temperature | -55 °C to +125 °C | -55 °C to +125 °C | -55 °C to +125 °C | -55 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
Key Differentiators
- Wide-body SOIC-16 with 5000 Vrms reinforced isolation in a single 6-channel device (vs ADuM160N0BRZ)
- 85 kV/µs minimum CMTI vs typical 50 kV/µs on lower-cost isolators (vs Si8621BB-B-IS)
- Same 16-SOIC DW footprint across 6/0, 5/1, 4/2 and 3/3 channel options (vs ISO774x series (different packages))
Design Notes
Place 0.1 µF bypass capacitors on VCC1 (pin 3) and VCC2 (pin 15) within 2 mm of the device pins, plus a 10 µF bulk cap on each side for transient suppression. Maintain at least 8 mm of clearance and creepage on the PCB surface beneath the device body to preserve the 5000 Vrms reinforced isolation rating — do not route any traces under the SOIC-16 package. The wide-body SOIC pads provide the required creepage if the PCB is properly designed (per TI ISO776x datasheet).
Power each side of the ISO7761DW from a separate supply derived either through a transformer-isolated DC/DC (e.g., SN6505BDBVR + push-pull transformer) or through an integrated isolated module (e.g., TI's ISOW series). VCC1 and VCC2 must be referenced to GND1 and GND2 respectively; never tie GND1 and GND2 together or you will defeat the isolation barrier. Total quiescent current at 1 Mbps is about 9 mA per side, rising to ~25 mA per side at 100 Mbps full load (estimate, see TI datasheet Figure 1).
Do not leave unused input pins floating — drive them either HIGH or LOW deterministically (per TI datasheet). Inputs left floating may couple noise through the capacitive barrier and produce output glitches. Similarly, ensure the EN1 (pin 4) and EN2 (pin 13) pins are actively driven or tied HIGH through a pull-up; if left floating they can oscillate and disable the channel intermittently. Finally, observe the maximum data rate derating at high temperature — propagation delay increases approximately 0.05 ns/°C above +25 °C, reducing timing margin for tight MCU SPI peripherals.
For 100 Mbps operation, source-terminate each input with a small series resistor (22–33 Ω) if the trace is longer than 25 mm, to prevent reflections on the 1 ns-edge-rate signal. Keep the input traces on each side of the barrier matched in length to minimise channel-to-channel skew, particularly for parallel ADC bus applications. The 5 ns max channel skew is sufficient for simultaneous sampling at 100 MSPS but begins to bite at 200 MSPS+ — verify against your ADC's clock window requirement.
Compliance Information
RoHS / REACH compliant per TI product page. Standard ISO7761DW is not AEC-Q100 — use the AEC-Q100-qualified ISO7761FQDWWQ1 for automotive designs. UL 1577, VDE IEC 60747-17, CSA, TUV, CQC certifications documented in TI certification report.
