AEC-Q100 gate-drive isolator for automotive power stages
The Skyworks SI8235AB-D-IS1 is a dual-channel digital isolator with integrated gate-drive outputs, qualified to AEC-Q100 for automotive applications. Capacitive coupling technology provides 2500Vrms isolation between the logic input and the power-stage side. The 4A peak output current, with asymmetric 2A source and 4A sink capability, drives the gate charge of IGBTs and MOSFETs in traction inverters, DC-DC converters, and on-board chargers without an external buffer stage.
Isolation and transient immunity for noisy environments
Common-mode transient immunity (CMTI) is specified at 20kV/µs minimum — this is the key parameter for gate-drive isolators in half-bridge topologies where the high-side switch reference swings rapidly. A CMTI below the switching edge rate causes data corruption or latch-up; 20kV/µs covers SiC and GaN switching edges up to the 100V/ns range. Propagation delay is 60ns max (tpLH and tpHL), with pulse-width distortion held to 5.6ns max. This timing symmetry matters for dead-time control in synchronous rectification and motor-drive PWM — asymmetric delay shifts the effective duty cycle and increases circulating current. Rise and fall times are 12ns typical (12ns max) into the rated load, matching the switching speed of modern power semiconductors without excessive cross-conduction during the transition window.
Regulatory acceptance and supply-chain fit
Approved by CQC, CSA, UR, and VDE — these certifications cover the major industrial and automotive regulatory jurisdictions (China, North America, Germany) without requiring separate qualification per region. The output supply range of 6.5V to 24V allows the same BOM position to serve 12V and 24V automotive electrical systems, as well as 15V industrial gate-drive rails, without a supply-rail change.