Diodes Incorporated MMSTA92-7-F

Overview

MMSTA92-7-F from Diodes Incorporated is a PNP small-signal surface-mount transistor in SOT-323 package, rated for V_CEO = −300 V, I_C = −100 mA, and P_D = 200 mW, optimized for high-voltage low-power switching and amplification in space-constrained industrial control and signal conditioning circuits.

For engineers reviewing the MMSTA92-7-F datasheet, MMSTA92-7-F pinout, MMSTA92-7-F application, or MMSTA92-7-F equivalent, key selection criteria include its −300 V breakdown rating, h_FE range of 25–40 at −10 mA, V_CE(SAT) ≤ −0.5 V at −20 mA/−2 mA drive, and RoHS-compliant green molding compound with J-STD-020C Level 1 moisture sensitivity.

Technical Context

This PNP bipolar junction transistor uses epitaxial planar die construction to support stable high-voltage operation up to −300 V across collector-base and collector-emitter terminals, with low leakage (I_CBO ≤ −250 nA at −200 V) and defined saturation behavior under pulsed DC conditions.

Its f_T = 50 MHz at −10 mA/−20 V enables use in medium-frequency amplification and fast-switching applications, while thermal resistance R_θJA = 625 °C/W reflects FR-4 PCB mounting per AP02001 layout, limiting continuous power dissipation above 75 °C ambient.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small plastic surface-mount case (2.0–2.2 mm × 1.15–1.35 mm × 0.25–0.40 mm height), UL 94V-0 rated, lead-free matte tin plating over Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSTA42-7-F, this part enables high-side switching with inherent level-shifting capability; versus BC807-40-7-F, it trades gain and cost for threefold higher voltage tolerance critical in industrial power interfaces.

Availability

MMSTA92-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, high-voltage logic level shifting, LED driver circuits, and overvoltage protection requiring stable component supply and long-term lifecycle continuity.

Supply support for MMSTA92-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the US.

The MMSTA92 belongs to Diodes' high-voltage small-signal transistor family, designed specifically for industrial and automotive applications demanding robust breakdown ratings and reliable performance under temperature extremes.

FAQ

What is the maximum allowable junction temperature for MMSTA92-7-F?

The absolute maximum junction temperature is +150 °C, consistent with its specified operating and storage temperature range of −55 to +150 °C. Derating begins at +75 °C ambient per Figure 1, where power dissipation drops linearly to zero at +150 °C ambient on standard FR-4 PCB.

Can MMSTA92-7-F be used in linear amplifier mode?

Yes - its f_T = 50 MHz and h_FE stability across −1 to −30 mA make it suitable for Class-A audio preamplifiers and sensor signal conditioning. However, linear operation must respect P_D = 200 mW limit and maintain V_CE < |V_CEO| to avoid second breakdown.

Is the SOT-323 package compatible with standard reflow profiles?

Yes - with J-STD-020C Level 1 moisture sensitivity, MMSTA92-7-F supports standard Pb-free reflow profiles (peak 260 °C, 20–40 sec above 217 °C) without preconditioning. Its matte tin finish ensures reliable wetting on ENIG and OSP PCB finishes.

How does the "Green" molding compound affect reliability?

Units manufactured from Date Code 0627 onward use halogen-free, antimony-free molding compound meeting IEC 61249-2-21. This eliminates corrosion risks from brominated flame retardants and improves long-term high-temperature stability in sealed enclosures without compromising UL 94V-0 flammability rating.