J-Link Isolators

J-Link Isolators provide galvanic isolation between the J-Link debug probe and the target hardware, protecting both the probe and the host PC from ground potential differences, voltage spikes, and electrical noise that are common in motor control, power electronics, industrial automation, and automotive applications. Without isolation, a ground loop between the USB-connected host and a target operating at a different ground potential can damage the debug probe, corrupt debug communication, or, in worst cases, destroy the host PC’s USB controller.

When Isolation Is Essential

Any target that drives inductive loads or sits on a different ground reference than the debug host benefits from an isolation barrier. Motor control boards, inverter designs, and automotive ECUs connected to vehicle ground are common examples. The J-Link Isolator inserts inline between the J-Link probe and the target’s debug connector, providing basic galvanic isolation rated at 1 kV DC while passing JTAG or SWD signals at up to 4 MHz.

The isolators use the standard 20-pin JTAG/SWD connector and come in two separate variants: the JTAG Isolator and the SWD Isolator. The JTAG variant cannot pass SWD (SWD uses a bidirectional data pin), so choose the variant that matches your debug interface. One important safety boundary, stated plainly by SEGGER: these devices provide basic isolation only, which protects your equipment from ground-potential differences and electrical spikes. They are not personnel protection. Wherever hazardous voltages are present, SEGGER requires additional protection measures (double or reinforced isolation) to protect people in case the first insulation barrier fails.

Features

Buy J-Link Isolators in India from GSAS

GSAS Micro Systems, an authorized engineering partner in India, supplies J-Link Isolators with competitive pricing and short lead times. For teams in Bengaluru, Hyderabad, Chennai, Pune, Mumbai, and Delhi NCR working on motor drives, power converters, or any application where the target ground is not shared with the debug host, the isolator is an essential companion to a J-Link BASE, PLUS, or PRO. Our field application engineers advise on isolation requirements for high-voltage benches. Request a quote for single units or lab kits.