Fuji Electric 2DI75Z-120 IGBT Power Module – Z-Series

Fuji Electric 2DI75Z-120 — Dual IGBT Half-Bridge Module in Industrial Power Conversion Architecture

The 2DI75Z-120 is a 75 A / 1200 V dual IGBT module manufactured by Fuji Electric under the Z-Series platform. It integrates two discrete IGBT chips and two anti-parallel freewheeling diodes into a single isolated-base package, forming a complete half-bridge switching cell. This topology is the fundamental building block of three-phase voltage-source inverters (VSI), bidirectional DC-DC converters, and active front-end rectifiers deployed across industrial drive, servo, and energy conversion systems.

Unlike earlier Fuji D-Series and M-Series modules, the Z-Series introduces a refined carrier lifetime profile in the IGBT drift region, reducing tail current duration during turn-off. At a switching frequency of 10 kHz and a DC bus voltage of 600 V, this translates to measurably lower Eoff per switching cycle — a parameter that directly governs thermal budget allocation in the power stage design. Engineers working within tight heatsink volume constraints will find this characteristic particularly relevant when sizing thermal management for continuous 75 A operation.

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Technical Parameters

Hardware Logical Analysis

The 2DI75Z-120 is constructed on a Direct Copper Bonding (DCB) ceramic substrate — typically Al₂O₃ or AlN — which bonds copper conductor layers directly to the ceramic without solder or adhesive intermediaries. This eliminates the thermal interface resistance layer that exists in older wire-bonded modules with separate insulation pads. The result is a Rth(j-c) value that remains stable over thermal cycling, as there is no delamination risk at a solder-to-insulator interface.

Each IGBT chip within the module is a planar-gate, n-channel, punch-through (PT) or non-punch-through (NPT) structure depending on the production batch. The Z-Series designation specifically refers to Fuji Electric’s optimization of the buffer layer doping profile, which controls the minority carrier injection efficiency during conduction and the recombination rate during turn-off. A faster recombination rate reduces the tail current — the residual collector current that flows after gate turn-off — which is the dominant source of turn-off switching loss (Eoff) at voltages above 400 V DC.

The integrated freewheeling diodes (FWD) are co-packaged anti-parallel diodes with a soft-recovery characteristic. Soft recovery means the reverse recovery current (Irr) decays gradually rather than abruptly, suppressing the di/dt spike that would otherwise induce voltage overshoot across stray bus inductance. In a practical PCB or busbar layout with 50–100 nH of parasitic inductance, a hard-recovery diode can generate voltage spikes of 200–400 V above the DC bus — a condition that stresses gate oxide and can cause latent IGBT failure. The soft-recovery FWD in the 2DI75Z-120 reduces this spike to manageable levels without requiring large snubber capacitors.

The isolated copper baseplate provides a low-resistance thermal path from the DCB substrate to the heatsink mounting surface. The baseplate flatness specification (typically < 50 µm bow over the mounting area) ensures uniform thermal interface material (TIM) compression, which is critical for achieving the rated Rth(c-h) value. Uneven baseplate contact is a common root cause of premature IGBT failure in field installations where TIM application is not controlled.

EMC performance of the module is influenced by the internal bond wire inductance and the layout of the gate-emitter sense terminals. The 2DI75Z-120 provides separate Kelvin emitter sense terminals for each IGBT, allowing the gate driver to reference the true emitter potential rather than the power emitter terminal, which carries high di/dt current. This Kelvin connection eliminates the emitter inductance-induced feedback that would otherwise reduce effective gate drive voltage during fast switching transients — a mechanism that degrades switching speed and increases switching losses in modules without this feature.

System Integration Benefits

• Reduced gate driver complexity: The Kelvin emitter sense terminals allow direct connection of standard isolated gate driver ICs (e.g., Infineon 1ED series, CONCEPT 2SC0108T) without external compensation networks for emitter inductance.
• Simplified thermal design: The isolated baseplate eliminates the need for insulating pads between the module and heatsink in most standard aluminum extrusion heatsink configurations, reducing Rth(c-h) by 0.05–0.10 °C/W compared to pad-insulated mounting.
• Predictable switching loss budget: The Z-Series low-tail-current characteristic provides consistent Eoff values across the IC operating range, enabling accurate power loss simulation in tools such as Infineon IPOSIM or Fuji Electric’s own loss calculation spreadsheets.
• Drop-in mechanical compatibility: The Z-Series package footprint and terminal positions are compatible with 2DI75D-120 and 2DI75M-120 in most existing PCB and busbar layouts, reducing redesign effort when upgrading to lower-loss switching devices.
• High short-circuit withstand time: The module is rated for 10 µs short-circuit withstand at rated VCES, providing sufficient response time for DESAT (desaturation) detection circuits in the gate driver to execute a controlled soft-turn-off without module damage.
• Wide operating temperature range: Tj rated to 150°C allows operation in ambient temperatures up to 50°C with standard forced-air cooling, without derating the output current — relevant for installations in non-air-conditioned industrial enclosures.
• Low VCE(sat) at rated current: At 75 A and VGE = 15 V, the saturation voltage remains ≤ 2.0 V, keeping conduction losses below 150 W per IGBT at full load — a figure that directly determines the minimum heatsink thermal resistance required for continuous operation.
• Standardized screw terminal interface: The M5 screw terminals on the P, N, and AC output connections accept standard ring-lug or busbar connections, supporting both PCB-mounted and busbar-based power stage architectures without custom interconnects.

Quality Assurance & Global Logistics

Every 2DI75Z-120 unit supplied by siemensplc.com is sourced through verified Fuji Electric authorized distribution channels. Fuji Electric manufactures IGBT modules under ISO 9001:2015 quality management systems at facilities in Japan, with each production lot subject to 100% electrical parametric testing at the factory level — including VCES blocking voltage, VCE(sat), VGE(th), and leakage current verification.

Upon receipt at our Xiamen, China facility, incoming units undergo secondary inspection: package marking verification against Fuji Electric’s official date code and lot number format, visual inspection for baseplate flatness and terminal integrity, and random-sample electrical spot-testing using calibrated curve tracer equipment. Units that do not pass inspection are quarantined and returned to the supply chain — they are not offered for sale.

Orders are dispatched from Xiamen within 1–3 business days of payment confirmation. Standard export logistics options include DHL Express (3–5 business days to Europe and North America), FedEx International Priority, and UPS Worldwide Express. For bulk orders exceeding 20 units, sea freight consolidation via Xiamen Port is available with lead times of 18–25 days to major global ports. All shipments include full tracking, commercial invoice, packing list, and certificate of origin documentation. Export classification is handled in compliance with Chinese customs regulations and applicable international trade controls.

A 12-month warranty covers manufacturing defects under normal operating conditions. Warranty claims require return of the unit with a failure description and application context. Physical damage, overvoltage events, or installation errors are excluded from warranty coverage per standard semiconductor component terms.

Contact Information

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📍 Location: Xiamen, China
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