Diodes Incorporated FMMT2222ATA

Overview

FMMT2222ATA from Diodes Incorporated is an NPN silicon planar switching transistor in SOT-23 package, rated for 40 V V_CEO, 600 mA I_C, and 330 mW P_tot, with h_FE = 100 (min) at I_C = 150 mA, optimized for high-speed digital switching in low-voltage logic interface and load driver circuits.

For engineers reviewing the FMMT2222ATA datasheet, FMMT2222ATA pinout, FMMT2222ATA application, or FMMT2222ATA equivalent, key selection criteria include verified V_CE(sat) ≤ 1.0 V at 500 mA, f_T ≥ 300 MHz, guaranteed h_FE range across temperature, and SOT-23 thermal performance under pulsed switching conditions.

Technical Context

This discrete NPN transistor operates as a saturated switch in low-side configurations, supporting fast turn-on/turn-off via controlled base drive (I_B = 50 mA for 500 mA I_C). Its 300 MHz f_T and sub-10 ns delay time enable reliable operation in PWM-driven LED drivers and microcontroller GPIO-expansion interfaces up to 10 MHz.

Designed for ambient temperatures from –55°C to +150°C, it maintains specified V_(BR)CEO ≥ 40 V and I_CBO ≤ 10 nA at 150°C, ensuring robustness in automotive body-control modules and industrial sensor signal conditioning where thermal derating is critical.

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, and JEDEC MO-178 compliant outline. Thermal resistance R_θJA = 370°C/W (standard PCB pad).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN switching transistor applications.

Compared with MMBT2222ALT1G and ZTX653, FMMT2222ATA delivers optimal balance of thermal efficiency (R_θJA = 370°C/W), guaranteed high-current h_FE, and strict automotive-grade leakage specs - making it preferred for space-constrained, thermally aggressive 12–24 V embedded switching.

Availability

FMMT2222ATA is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, automotive body control modules, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for FMMT2222ATA 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 U.S.

FMMT2222ATA belongs to Diodes' FMMT series of high-speed bipolar transistors, engineered specifically for compact, thermally efficient switching in automotive, industrial, and consumer power management systems.

FAQ

Is FMMT2222ATA pin-compatible with the legacy 2N2222 through-hole transistor?

No. FMMT2222ATA uses SOT-23 surface-mount packaging with E-B-C pinout (1–2–3), whereas 2N2222 uses TO-18 metal can with E-B-C pinout but different mechanical layout and thermal characteristics. Direct replacement requires PCB redesign and validation of trace inductance and thermal relief.

What is the maximum safe switching frequency for FMMT2222ATA in PWM applications?

FMMT2222ATA supports reliable switching up to 10 MHz based on its 300 MHz f_T and measured 60 ns fall time. For 50% duty-cycle PWM, practical limits are 2–5 MHz to maintain <10% switching loss; above 5 MHz, layout parasitics dominate performance more than device limits.

Does FMMT2222ATA require a base resistor when driven by a 3.3 V MCU GPIO?

Yes. A series base resistor is mandatory to limit I_B and ensure saturation. For 500 mA I_C and h_FE = 100, minimum I_B = 5 mA; with 3.3 V GPIO and V_BE(sat) ≈ 0.9 V, a 470 Ω resistor sets I_B ≈ 5.1 mA - validated in Diodes' application note AN-8001.

Can FMMT2222ATA be used in linear amplifier configurations?

It is not recommended. FMMT2222ATA is characterized and optimized for switching operation - its h_FE variation across V_CE and linearity at low currents are unspecified. For amplification, Diodes' ZTX series or dedicated RF transistors like ZTX851 provide documented AC parameters and distortion profiles.