Diodes Incorporated MMBTA92-7-F

Overview

MMBTA92-7-F from Diodes Incorporated is a 300V PNP small-signal transistor in SOT-23 package, rated for −300V V_CEO, −500mA I_C, and 300mW power dissipation, with h_FE = 25–40 at −10mA/−10V, used in medium-power switching and amplification circuits in industrial power supplies and relay drivers.

For engineers reviewing the MMBTA92-7-F datasheet, MMBTA92-7-F pinout, MMBTA92-7-F application, or MMBTA92-7-F equivalent, key selection criteria include high-voltage PNP switching capability, AEC-Q101 qualification for automotive-grade reliability, thermal performance on FR4 PCBs, and complementary pairing with MMBTA42 in push-pull stages.

Technical Context

This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with verified breakdown ratings: −300V V_CBO/V_CEO, −5.0V V_EBO, and guaranteed leakage < −250nA I_CBO at −200V. Its f_T = 50MHz supports medium-frequency amplification up to ~10MHz in linear stages.

Thermal design is constrained by R_θJA = 417°C/W on minimum 1oz copper FR4, limiting continuous I_C at elevated ambient temperatures-Fig. 1 confirms derating to ~150mW at +100°C. Saturation behavior is characterized at −20mA I_C/−2mA I_B, yielding V_CE(SAT) ≤ −0.5V and V_BE(SAT) ≤ −0.9V.

Key Specifications

Pinout & Package

SOT-23 plastic package (JEDEC TO-236AB), 3-terminal surface-mount device with 0.008g mass, UL 94V-0 flammability rating, and matte tin-plated leads solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT3906-7-F, MMBTA92-7-F delivers 7.5× higher voltage blocking but trades 2.5× lower h_FE; versus ZTX951, it offers identical voltage rating with 3× smaller footprint and 1/3 the thermal mass, enabling faster transient response in compact layouts.

Availability

MMBTA92-7-F is available at Aetrix Electronics and suitable for industrial power supply control, automotive relay drivers, AC-DC auxiliary bias supplies, and discrete audio preamp stages requiring stable component supply with AEC-Q101 traceability and green compliance.

Supply support for MMBTA92-7-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 MMBTA92 belongs to Diodes' general-purpose bipolar transistor product line, engineered for cost-sensitive, high-reliability switching and amplification in automotive, industrial, and consumer power systems where voltage robustness and thermal stability are critical.

FAQ

What is the maximum continuous collector current for MMBTA92-7-F at 100°C ambient?

At T_A = +100°C, the device's power dissipation derates to approximately 150mW (per Fig. 1). With V_CE(SAT) ≤ −0.5V, the practical continuous I_C limit is ~300mA-well below the absolute −500mA rating but within safe SOA limits for sustained operation.

Is MMBTA92-7-F suitable for linear amplification applications?

Yes-its f_T = 50MHz and h_FE stability across −1mA to −30mA (Fig. 3) support Class-A audio preamplifier stages. However, thermal resistance (R_θJA = 417°C/W) requires careful heatsinking or low quiescent current (<5mA) to avoid distortion from thermal drift.

How does the SOT-23 package affect PCB layout for high-voltage operation?

The SOT-23 footprint mandates ≥2.5mm creepage distance between emitter and collector pads per IPC-2221B for 300V working voltage. Diodes' AP02001 pad layout and AP02002 mechanical drawing specify minimum trace widths and spacing to prevent arcing or tracking in humid environments.

Does MMBTA92-7-F have lead-free and halogen-free certifications?

Yes-MMBTA92-7-F is fully RoHS 2 compliant (2011/65/EU), lead-free per EU Directive 2002/95/EC, and "Green" certified with bromine/chlorine <900ppm each and antimony <1000ppm, verified per Diodes' internal test reports and published on their quality portal.