1PCS IXYS VUB145-16NO1 / VUB14516N01 — Single-Switch IGBT Power Module

IXYS (Littelfuse) · VUB Series · 1600 V / 145 A Class · 1PC

The IXYS VUB145-16NO1 (cross-reference VUB14516N01) is a single-switch IGBT power module from the IXYS VUB series, now branded under Littelfuse after the 2018 acquisition. Rated at 1600 V V_CES and ~145 A continuous collector current at TC = 80 °C, it sits in the same power-semiconductor class that KOEED sources for industrial drives, UPS, solar inverters, induction heating and welding-inverter builders. Supplied as a 1-piece unit (1PC) for module-level repair and small-batch OEM builds, the VUB145-16NO1 is a proven drop-in for legacy IXYS designs that are increasingly hard to find on open distribution.

1. Key Technical Specifications

2. Application Scenarios — Where the VUB145-16NO1 Fits

The VUB145-16NO1 is a workhorse device in the 1600 V / 145 A IGBT class. It is the same power-semiconductor class that drives the inverter stages sitting next to Allen-Bradley PowerFlex cabinets, the DC-link choppers inside Siemens Sinamics drives, and the servo amplifiers in Mitsubishi MR-J4 / Yaskawa Σ-7 racks. Typical deployment sites include:

• Small VFDs and servo drives — single-switch chopper stage feeding the rectified DC bus of low-voltage Omron and Schneider Modicon drives.
• UPS input inverters — 1600 V rating leaves comfortable margin for 400 V / 480 V three-phase rectified bus with regeneration.
• Solar / PV string inverters — step-up chopper and H-bridge legs in three-phase string inverters up to ~30 kW class.
• Induction heating & welding inverters — resonant topologies at 10 – 50 kHz where single-switch modules simplify the tank.
• EV charging rectifier stages — DC fast charger PFC and DC-DC converter power stages.
• Industrial SMPS — high-power welding, plating and Panasonic-class laser-driver supplies.
• Service / repair of legacy IXYS designs — direct swap for VUB145 family used in 2000s-era Fanuc spindle drives and KEYENCE vision-controller power stages that are now hard to source.

In short, anywhere a 2000s-era IXYS single-switch IGBT was specified in a chopper, PFC front-end, or H-bridge leg, the VUB145-16NO1 is the modern equivalent — and the one most factory-floor teams can still find in 1PC quantities.

3. Integration & Wiring Notes

Like any single-switch IGBT in the 1600 V class, the VUB145-16NO1 must be integrated with three things in mind: DC-link layout, gate drive, and thermal path. Engineers who have integrated IGBT modules in industrial drives will find the layout rules familiar:

• DC-link capacitance — place low-ESR film or electrolytic capacitors within 5 cm of the module terminals to keep commutation loop inductance below ~50 nH. Excessive loop inductance will overshoot V_CE above 1600 V during turn-off and destroy the device.
• Gate drive — use a dedicated +15 V / −8 V gate drive capable of a peak gate current ≥ 5 A. IXYS VUB modules respond well to standard SCALE-2 / SCALE-3-style dual-channel drivers. Twisted-pair gate-emitter wiring, with a 10 Ω gate resistor in series, is the typical starting point.
• Short-circuit protection (DESAT) — always wire DESAT. A short on the load side will pull the collector high within microseconds; the DESAT comparator must blank for at least 3 µs and then turn the gate off within 5 – 10 µs.
• Power terminals — use the correct ring-lug / bus-bar pattern for the 62 mm or 34 mm footprint. Torque the main terminals to the IXYS-published value (typically 3 – 5 Nm for power, 1.2 Nm for signal pins). Under-torqued power connections will arc over at full load.
• Snubber — for chopper topologies, a small RC snubber (typically 0.1 – 1 µF + 5 – 20 Ω) across the module will damp the turn-off overshoot and reduce EMI on adjacent EtherNet/IP or Profinet runs.
• Isolation — confirm whether the variant you receive is isolated-baseplate or non-isolated. Non-isolated variants require a thermal interface material (TIM) rated for the DC-link voltage between baseplate and heatsink.

These rules are the same ones KOEED documents in our engineering notes; they apply equally to a $5,000 drive retrofit and a $50,000 welding-inverter build.

4. Installation & Commissioning Tips

VUB145-16NO1 modules are forgiving at the system level if you respect the mechanical side. The most common field failures on this part are thermal, not electrical — usually a heatsink compound or torque issue, not a silicon issue.

• Thermal interface — apply a thin, even layer of high-quality silicone-based or phase-change TIM. Too much paste is as bad as too little; aim for ~50 µm bond line. For new builds, consider pre-applied thermal pads (Bergquist, Fujipoly) to keep assembly repeatable.
• Heatsink surface — flatness ≤ 0.05 mm per 100 mm, roughness Ra ≤ 1.6 µm. A warped heatsink will crack the module baseplate and lift the die.
• Mounting torque — torque the baseplate bolts in a star pattern to the published value (typically ~5 Nm for the 34 mm / 62 mm form factor). Re-torque after the first 50 thermal cycles on critical installations.
• Cooling check — confirm airflow / water flow before energizing. A 145 A IGBT at V_CE(sat) ~2 V drops ~290 W per switch; under-sized cooling is the #1 commissioning failure seen on VUB-class repairs.
• First power-up — bring up the DC bus with a current-limited supply, verify V_CE(sat) on a single low-power pulse with a current shunt, and observe gate waveforms on a scope with proper differential probing. Then ramp load in 25 % steps.
• Storage & ESD — IXYS VUB modules are ESD-sensitive on the gate. Store in the original anti-static foam, and use a wrist strap when handling the gate pins.
• Cross-reference — if a VUB145-16NO1 is unavailable in your timeline, the IXYS VUB145-16E1 and the newer Littelfuse-branded equivalents are typically drop-in. Confirm pinout against the IXYS-to-Littelfuse cross-reference before re-laying out a board.

For deeper guidance, see our IGBT cooling design guide and our AI diagnostic tool for fault-symptom triage on legacy IXYS modules.

5. Procurement, Warranty & Lead Time

KOEED sources VUB145-16NO1 in 1-piece, small-batch, and project-quantity volumes through the same China sourcing channel we use for Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic and KEYENCE. Every unit is visually inspected, ESD-safe bagged, and shipped with a packing list. KOEED is an independent multi-brand distributor; we are not an IXYS / Littelfuse subsidiary, and we do not claim OEM authorization — what we offer is sourcing depth, fast quotes, and worldwide shipping.

Send your RFQ or full inverter / drive BOM to Moritta@KOEED.COM, or use the Create a Quote form. We typically respond with stock, lead time, and pricing within 24 hours on business days. Need help crossing the VUB145-16NO1 to a current Littelfuse equivalent? Our AI diagnostic tool can also help identify direct replacements from a photo of the device label.

Related brands at KOEED: Allen-Bradley · Siemens · Mitsubishi · Omron · Fanuc · Schneider · Yaskawa · Panasonic · KEYENCE. Browse the full all-collection index, return to KOEED home, or contact us.

Part-number questions, datasheets, or substitution advice: Moritta@KOEED.COM. KOEED is an independent industrial-automation distributor — not an IXYS / Littelfuse subsidiary.