Vishay Siliconix VP0808B

Overview

VP0808B from Siliconix is a P-channel enhancement-mode MOSFET designed for high-side switching in low-power DC systems. It features –80 V drain-source breakdown voltage, 2.5 Ω maximum rDS(on) at –10 V VGS, –3.4 V typical gate threshold, –0.88 A continuous drain current, and TO-205AD (TO-39) metal-can package with case-drain configuration.

For engineers reviewing the VP0808B datasheet, VP0808B pinout, VP0808B application, or VP0808B equivalent, this device is selected for battery-operated load switching where moderate voltage rating, low gate drive requirement, and thermal robustness in through-hole metal packages are critical.

Technical Context

The VP0808B operates as a normally-off P-channel switch requiring negative gate-to-source bias for conduction. Its –3.4 V typical VGS(th) enables direct interface with standard logic-level drivers without level-shifting circuitry. The 75 pF input capacitance and 40 ns turn-on time support fast digital control in power management circuits.

Thermal design is supported by a 20 °C/W junction-to-case resistance and 156 °C/W junction-to-ambient rating in the TO-205AD package. Absolute maximum ratings include –80 V VDS, –20 V VGS, and 6.25 W power dissipation at TC = 25 °C - confirming suitability for intermittent high-current pulse loads.

Key Specifications

Pinout & Package

VP0808B uses the TO-205AD (TO-39) metal-can package with case-drain configuration: the metal case is electrically connected to the drain terminal and must be isolated from other system potentials unless intentionally used as heat sink and return path.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar P-channel MOSFET switching applications.

Compared with IRF9530NPbF and ZVP3306A, the VP0808B occupies a unique niche: it delivers –80 V capability and 2.5 Ω rDS(on) in a hermetically sealed TO-205AD metal can - offering superior thermal stability and EMI immunity for industrial and aerospace-grade high-side switching where reliability outweighs cost-per-watt optimization.

Availability

VP0808B is available at Aetrix Electronics and suitable for portable battery management, industrial sensor power gating, relay driver interfaces, and memory backup power switching requiring stable component supply across extended product lifecycles.

Supply support for VP0808B 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

Siliconix, founded in 1962 and acquired by Vishay in 1998, pioneered early power MOSFET technology and established industry benchmarks for ruggedness, thermal performance, and switching fidelity.

The VP0808B belongs to Siliconix's legacy P-channel enhancement-mode MOSFET family, engineered specifically for high-reliability high-side switching in military, aerospace, and industrial control systems where hermetic packaging and predictable threshold behavior are mandatory.

FAQ

What is the maximum continuous drain current rating for VP0808B?

The VP0808B is rated for –0.88 A continuous drain current at TJ = 150 °C with proper heatsinking. At ambient temperature (TA = 25 °C), its power dissipation limit of 6.25 W corresponds to approximately –2.5 A under ideal thermal conditions - but the –0.88 A rating reflects realistic derated operation with case-to-ambient thermal resistance. Always verify junction temperature using RthJC = 20 °C/W in actual layout.

Does VP0808B have a drain-connected metal case, and how does that affect PCB layout?

Yes, the VP0808B uses the TO-205AD (TO-39) package with the metal case internally connected to the drain terminal. This requires electrical isolation from ground or other potentials unless the drain is intentionally grounded. Layout must include insulated mounting hardware or conformal coating if the case contacts chassis, and thermal vias should avoid shorting to adjacent signal layers.

Can VP0808B be driven directly by a 3.3 V microcontroller GPIO pin?

No - the VP0808B requires a negative gate-to-source voltage to conduct, with a typical VGS(th) of –3.4 V. A 3.3 V GPIO cannot produce the necessary negative bias. It must be driven by an inverting stage (e.g., NPN transistor or dedicated level shifter) referenced to the source, or used in high-side configuration where the source is at system VCC and gate is pulled down toward ground.

What is the gate leakage current specification for VP0808B at elevated temperature?

The VP0808B specifies gate-body leakage (IGSS) of ≤100 nA at VGS = 20 V and TA = 25 °C, and ≤500 nA at TJ = 125 °C. This low leakage ensures minimal static power draw in always-on control paths and preserves accuracy in precision timing or reference circuits where gate current could induce offset errors.

Is VP0808B suitable for PWM motor control applications?

The VP0808B supports PWM operation with 40 ns turn-off time and 75 pF input capacitance, but its –0.88 A continuous rating and 2.5 Ω rDS(on) limit use to low-power brushed DC motors (<1 W mechanical output). It is appropriate for fan speed control or solenoid actuation in instrumentation, but not for higher-current H-bridge or BLDC gate driving - where lower Rds(on) and higher ID devices are required.