Six-channel automotive digital isolator with 5000Vrms isolation
The Texas Instruments ISO7761QDWQ1 is a six-channel, unidirectional digital isolator built on capacitive coupling technology, designed for galvanic isolation in automotive and industrial systems. It delivers a 100Mbps data rate across all channels while maintaining 5000Vrms isolation and a minimum common-mode transient immunity of 85kV/µs — parameters that matter when isolating SPI, UART, or parallel data buses in motor drives, battery management, and on-board chargers.
85 kV/µs CMTI — what it means for motor-drive and inverter designs
Common-mode transient immunity (CMTI) of 85kV/µs is the figure that determines whether the isolator maintains data integrity when high-voltage switching transients slam across the isolation barrier. In a 48V or 400V traction inverter, the switching node can slew at tens of kV/µs; a CMTI rating below that threshold risks bit errors or latch-up. The ISO7761QDWQ1's 85kV/µs minimum provides margin for most automotive and industrial motor drives, including SiC and GaN based designs where edge rates are fastest. The propagation delay is a symmetrical 16ns max for both tpLH and tpHL, with pulse-width distortion held to 4.9ns max — tight enough for high-speed PWM signalling without excessive timing skew.
Wide supply range and flexible channel configuration
The supply voltage range spans 2.25V to 5.5V on both sides, allowing direct interface with 2.5V, 3.3V, and 5V logic families without external level shifters. The six channels are configured with five inputs on side 1 and one input on side 2 — a split that suits applications like isolating a 4-bit or 8-bit parallel bus plus a single control signal, or five sensor inputs and one enable/status line. The unidirectional channel type means each channel's direction is fixed; there is no bidirectional or configurable I/O. The 16-SOIC wide-body package (7.50mm width) provides the creepage distance needed for the 5000Vrms isolation rating.