Diodes Incorporated FMMTA92TC

Overview

FMMTA92TC from Diodes Incorporated is a PNP bipolar junction transistor (BJT) rated for high-voltage switching and linear amplification, featuring V_CEO = −300 V, I_C = −200 mA continuous, h_FE = 25–250 (at I_C = −1 to −30 mA), and SOT23 package. It serves in flyback snubber circuits, relay drivers, and HV DC-DC converter bias rails where high breakdown voltage and compact footprint are critical.

For engineers reviewing the FMMTA92TC datasheet, FMMTA92TC pinout, FMMTA92TC application, or FMMTA92TC equivalent, key selection criteria include verified −300 V V_CEO, −200 mA I_C rating, SOT23 thermal resistance (R_θJA = 403 °C/W on minimal pad), and complementary pairing with FMMTA42 in push-pull topologies.

Technical Context

This PNP BJT operates in active, saturation, and cutoff regions with guaranteed breakdown at −300 V across collector–emitter and collector–base terminals. Its f_T = 50 MHz enables moderate-speed switching up to ~100 kHz in hard-switched converters, while V_CE(sat) = −0.5 V at I_C = −20 mA / I_B = −2 mA supports low-loss saturation in driver stages.

Thermal design relies on R_θJL = 350 °C/W (junction-to-lead) and derating curves showing 0.31 W max power at 25 °C ambient, dropping linearly to zero at 150 °C. ESD robustness includes 4 kV HBM and 400 V MM ratings per JEDEC JESD22-A114/A115.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount plastic package with 3-pin configuration, 0.008 g 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 high-voltage PNP transistor applications.

Compared with MMBTA92 and ZTX951, FMMTA92TC delivers optimal balance of high-voltage capability, SOT23 footprint, and manufacturability for cost-sensitive industrial controls-offering superior thermal resistance versus MMBTA92 and 60% smaller board area than ZTX951.

Availability

FMMTA92TC is available at Aetrix Electronics and suitable for relay driver stages, flyback snubber networks, DC-DC bias supplies, and high-voltage level shifters requiring stable component supply across automotive, industrial, and power electronics programs.

Supply support for FMMTA92TC 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, manufacturing, and sales operations across Asia, Europe, and North America.

The FMMTA92TC belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for industrial power conversion, protection circuitry, and ruggedized signal conditioning where reliability at elevated voltage stress is mandatory.

FAQ

What is the maximum safe operating voltage for FMMTA92TC in continuous DC applications?

The FMMTA92TC is rated for V_CEO = −300 V and V_CBO = −300 V under DC conditions at T_A = 25 °C. For continuous operation, design must maintain V_CE ≤ −250 V to ensure 16.7% voltage margin against process variation and temperature-induced degradation per JEDEC JESD47 guidelines.

Can FMMTA92TC be used as a direct replacement for FMMTA42 in complementary circuits?

No - FMMTA92TC is a PNP device while FMMTA42 is its NPN complement. They are designed for paired use (e.g., push-pull outputs), not substitution. Swapping them would reverse current flow direction and disable circuit functionality; correct implementation requires matching polarity and verifying h_FE symmetry across both devices.

Does FMMTA92TC require a heatsink in standard SOT23 mounting configurations?

Not for typical operation below 0.15 W dissipation. With R_θJA = 403 °C/W on minimal pad layout, 0.15 W yields ~60 °C junction rise above ambient. Heatsinking becomes necessary only above 0.2 W or in ambient temperatures exceeding 70 °C - in which case a 15 mm × 15 mm 1 oz copper pad reduces R_θJA to 357 °C/W per datasheet Note 6.

How does the "Green" designation impact soldering profile compatibility?

The halogen- and antimony-free molding compound complies with IPC-J-STD-020 moisture sensitivity Level 1 and supports standard lead-free reflow profiles (peak 260 °C, 60 s). No special pre-bake or extended soak times are required, and the matte tin plating ensures compatibility with both SnPb and SAC305 pastes per MIL-STD-202 Method 208.