Vishay General Semiconductor - Diodes Division VI40120C-M3/4W

Overview

VI40120C-M3/4W from Vishay General Semiconductor is a dual common-cathode high-voltage trench MOS barrier Schottky rectifier in TO-262AA package, rated for 120 V reverse voltage, 2 × 20 A average forward current per diode, and 0.63 V forward voltage at 20 A (125 °C), optimized for high-efficiency DC/DC converters and reverse battery protection.

For engineers reviewing the VI40120C-M3/4W datasheet, VI40120C-M3/4W pinout, VI40120C-M3/4W application, or VI40120C-M3/4W equivalent, key selection criteria include its ultra-low VF (0.43 V @ 5 A, 125 °C), 250 A surge rating, 10,000 V/μs dV/dt capability, and halogen-free RoHS-compliant construction with JESD 201 Class 1A whisker resistance.

Technical Context

This device integrates two independent Schottky diodes in a single TO-262AA thermally enhanced package with common cathode configuration, enabling OR-ing and freewheeling functions without cross-conduction risk. Its trench MOS architecture delivers lower forward voltage than planar Schottky counterparts while maintaining low leakage at 125 °C (22 mA @ 120 V).

The VI40120C-M3/4W operates across –40 °C to +150 °C junction temperature range with 1.8 °C/W typical junction-to-case thermal resistance per diode, supporting high-power-density designs where thermal management and efficiency are critical constraints.

Key Specifications

Pinout & Package

Package: TO-262AA - surface-mount compatible variant of TO-220 with isolated tab, 1.45 g unit weight, UL 94 V-0 molding compound, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual Schottky rectifier applications.

Compared with V40120C-M3/4W and SS120H-TP, the VI40120C-M3/4W uniquely combines dual common-cathode integration, TO-262AA surface-mount compatibility, and industry-leading 0.43 V V_F at 125 °C-making it optimal for thermally constrained, high-reliability redundant power systems.

Availability

VI40120C-M3/4W is available at Aetrix Electronics and suitable for high-frequency DC/DC converters, reverse battery protection circuits, and OR-ing diode applications requiring stable component supply, consistent halogen-free compliance, and long-lifecycle support.

Supply support for VI40120C-M3/4W includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and optoelectronics with emphasis on high-reliability, high-efficiency power solutions.

The VI40120C-M3/4W belongs to Vishay's TMBS® (Trench MOS Barrier Schottky) product line, engineered specifically for high-efficiency power conversion in automotive, industrial, and computing applications where low forward voltage and high surge robustness are mandatory.

FAQ

What is the maximum junction temperature rating for the VI40120C-M3/4W?

The VI40120C-M3/4W has a maximum junction temperature (T_J) rating of +150 °C, verified per Vishay Document Number 89163. This allows sustained operation in high-ambient environments such as enclosed industrial controllers or under-hood automotive modules. Derating curves in Figure 1 confirm usable current capacity down to 0 A at 175 °C case temperature, but the absolute T_J limit remains +150 °C for reliability assurance. The VI40120C-M3/4W must be thermally designed to ensure this limit is never exceeded during peak-load transients.

Does the VI40120C-M3/4W support surface-mount assembly?

Yes, the VI40120C-M3/4W uses the TO-262AA package, which is a surface-mount variant of TO-220 with isolated metal tab and gull-wing leads. It is qualified for reflow soldering per JESD 22-B106 (275 °C max, 10 s), and its matte tin plating meets J-STD-002 solderability requirements. Unlike through-hole TO-220AB variants, the VI40120C-M3/4W eliminates manual insertion and wave solder steps-enabling full SMT line compatibility while retaining thermal performance via direct tab-to-heatsink mounting. The VI40120C-M3/4W is not intended for hand-soldering due to thermal mass.

What is the reverse leakage current specification for the VI40120C-M3/4W at 125 °C?

At 125 °C and 120 V reverse bias, the VI40120C-M3/4W exhibits a maximum reverse current (I_R) of 45 mA per diode, as specified in the Electrical Characteristics table of Vishay Document 89163. This value reflects worst-case leakage under elevated thermal stress and is critical for reverse battery protection applications where standby current must remain below system thresholds. Measured typical leakage at this condition is 22 mA, confirming robust trench MOS barrier integrity. The VI40120C-M3/4W maintains this performance without thermal runaway up to its rated T_J limit.

Is the VI40120C-M3/4W pin-compatible with the V40120C-M3/4W?

No, the VI40120C-M3/4W and V40120C-M3/4W are not pin-compatible. While both share identical electrical specifications and common-cathode pin function assignment (Pin 1 = Anode 1, Pin 2 = Cathode, Pin 3 = Anode 2), the VI40120C-M3/4W uses TO-262AA with gull-wing leads and isolated tab, whereas the V40120C-M3/4W uses TO-220AB with through-hole leads and electrically connected tab. PCB footprints, thermal pad layout, and mounting hardware differ fundamentally. The VI40120C-M3/4W requires dedicated SMT stencil and reflow profile-not a drop-in replacement for V40120C-M3/4W.

What does the "M3" suffix indicate for the VI40120C-M3/4W?

The "M3" suffix on the VI40120C-M3/4W denotes Vishay's commercial-grade, halogen-free, RoHS-compliant construction meeting JESD 201 Class 1A whisker resistance requirements. It confirms matte tin plating on leads, UL 94 V-0 mold compound, and full compliance with IPC-1752A material declarations. The "M3" designation also implies qualification for 1000-cycle temperature cycling (–40 °C to +125 °C) and 1000-hour unbiased HAST testing. This suffix applies identically across both VI40120C-M3/4W and V40120C-M3/4W, ensuring consistent environmental compliance regardless of package type. The VI40120C-M3/4W carries no military or automotive AEC-Q200 qualification.