onsemi FJV92MTF

Overview

FJV92MTF from ON Semiconductor is a PNP epitaxial silicon transistor rated for -350 V collector-base and collector-emitter breakdown voltage, -500 mA continuous collector current, 350 mW power dissipation, and 50 MHz current gain bandwidth product in SOT-23 package. It serves as a high-voltage switching or linear amplification device in offline power supply bias rails and flyback snubber circuits.

For engineers reviewing the FJV92MTF datasheet, pinout, applications, or equivalent options, key selection criteria include verified -350 V blocking capability, SOT-23 thermal resistance of 357 °C/W, DC current gain range of 25–40 at -1 to -30 mA, and saturation voltages below -0.9 V at -20 mA drive.

Technical Context

This PNP transistor uses epitaxial base construction to support high-voltage operation up to -350 V with low leakage (ICBO ≤ -0.25 µA at -200 V). Its fT of 50 MHz at -20 V VCE and -10 mA IC enables stable performance in high-frequency switch-mode auxiliary supplies.

The device operates with VBE(sat) = -0.9 V and VCE(sat) = -0.5 V under -20 mA IC / -2 mA IB conditions, confirming robust saturation behavior for efficient switching. Cob = 6 pF at -20 V VCB supports predictable turn-off timing in inductive load interfaces.

Key Specifications

Pinout & Package

SOT-23 plastic surface-mount package with gull-wing leads; 1.3 mm × 2.9 mm footprint; 1.1 mm height; JEDEC MO-178 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-voltage switching applications.

Compared with MMBT92MTF and ZTX951, the FJV92MTF offers optimal balance of -350 V rating, SOT-23 compactness, and predictable hFE for cost-sensitive auxiliary supply designs where thermal constraints and footprint are critical.

Availability

FJV92MTF is available at Aetrix Electronics and suitable for offline AC-DC auxiliary supplies, isolated flyback snubbers, and industrial relay drivers requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for FJV92MTF 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

ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete devices for automotive, industrial, cloud, and consumer markets.

The FJV92MTF belongs to ON Semiconductor's high-voltage bipolar transistor portfolio, engineered for reliable operation in mains-connected power conversion stages where voltage robustness and thermal predictability are essential.

FAQ

What is the maximum collector-emitter voltage rating for FJV92MTF?

The FJV92MTF has a guaranteed minimum collector-emitter breakdown voltage (BVCEO) of -350 V at IC = -1 mA and IB = 0. This rating is validated under pulse test conditions (PW ≤ 300 µs, duty cycle ≤ 2%) and defines the absolute upper limit for safe DC or repetitive peak voltage exposure in circuit design. Exceeding this value risks irreversible avalanche failure.

Can FJV92MTF be used as a direct replacement for Fairchild FJV92M?

Yes, the FJV92MTF is the ON Semiconductor–branded successor to the Fairchild FJV92M, retaining identical electrical specifications, pinout, and SOT-23 package. The "TF" suffix denotes tape-and-reel packaging per EIA-481-D standard, and no circuit redesign or layout change is required when migrating from FJV92M to FJV92MTF.

What is the typical DC current gain (hFE) of FJV92MTF at -10 mA collector current?

At VCE = -10 V and IC = -10 mA, the FJV92MTF exhibits a typical DC current gain (hFE) of 40, with a guaranteed minimum of 25 across the production lot. This value is measured under controlled lab conditions and must be verified in the final application due to dependencies on PCB layout, ambient temperature, and bias network tolerances.

Does FJV92MTF require a heatsink in standard SOT-23 mounting?

The FJV92MTF has a junction-to-ambient thermal resistance (RTH(j-a)) of 357 °C/W in standard SOT-23 mounting on FR-4 with no copper pour. At 350 mW maximum power dissipation, this yields a theoretical junction temperature rise of ~125 °C above ambient - exceeding safe limits. Therefore, thermal relief (e.g., 1-in² copper pad) or derating below 100 mW is required for continuous operation at room temperature.

How does the output capacitance (Cob) of FJV92MTF affect snubber circuit design?

The FJV92MTF specifies Cob = 6 pF at VCB = -20 V, which directly impacts snubber timing constants and high-frequency ringing suppression. In flyback snubber networks, this low capacitance minimizes unintended phase shift and preserves intended RC time constant accuracy, enabling tighter control of voltage overshoot during MOSFET turn-off transitions.