Diodes Incorporated MMDT2222A-7

Overview

MMDT2222A-7 from Diodes Incorporated is a dual NPN small-signal surface-mount transistor in SOT-363 package, rated for 40 V V_CEO, 600 mA I_C, and 200 mW P_D, with DC current gain (h_FE) ranging from 35 to 300 depending on bias conditions; used in low-power switching and amplification stages of portable audio, LED drivers, and logic-level interface circuits.

For engineers reviewing the MMDT2222A-7 datasheet, MMDT2222A-7 pinout, MMDT2222A-7 application, or MMDT2222A-7 equivalent, key selection criteria include verified V_CE(SAT) ≤ 1.0 V at 500 mA/50 mA drive, f_T = 300 MHz at 20 mA, thermal resistance R_JA = 625 °C/W on FR-4, and RoHS-compliant lead-free plating per J-STD-020C Level 1 moisture sensitivity.

Technical Context

This dual NPN transistor uses epitaxial planar die construction for consistent gain and low leakage, supporting independent or paralleled operation of both transistors within one SOT-363 footprint. Each device exhibits V_(BR)CEO = 40 V, V_(BR)EBO = 6.0 V, and I_CBO ≤ 10 nA at 60 V, enabling reliable operation in 3.3 V–24 V digital and analog signal paths.

Switching performance is characterized by t_d = 10 ns, t_r = 25 ns, t_s = 225 ns, and t_f = 60 ns under 30 V V_CC, 150 mA I_C, and matched base drive - suitable for medium-speed digital logic buffering and PWM-controlled load switching up to ~1 MHz.

Key Specifications

Pinout & Package

Package: SOT-363 (SC-70-6), ultra-small surface-mount plastic case with UL 94V-0 flammability rating and moisture sensitivity level 1 per J-STD-020C; weight ≈ 0.006 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual NPN small-signal transistor applications.

Compared with MMDT2222A-7, DMN2004LK-7 trades integration for voltage headroom, while MMDT3904-7 sacrifices current capacity for tighter h_FE distribution - making MMDT2222A-7 optimal for space-constrained, medium-current dual-switching designs.

Availability

MMDT2222A-7 is available at Aetrix Electronics and suitable for portable audio amplifiers, LED driver circuits, logic-level translation, and industrial sensor interface applications requiring stable component supply and long-term manufacturability.

Supply support for MMDT2222A-7 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 and manufacturing operations across Asia and the Americas.

The MMDT2222A belongs to Diodes' small-signal transistor product line, engineered for high-reliability, low-cost switching and amplification in consumer, computing, and industrial equipment where miniaturization and thermal robustness are essential.

FAQ

Is MMDT2222A-7 pin-compatible with the legacy PNP complement MMDT2907A-7?

No, MMDT2222A-7 and MMDT2907A-7 share the same SOT-363 package and pin numbering, but their internal transistor polarities differ: pins 1–3 form one NPN, while pins 4–6 form the second NPN in MMDT2222A-7; MMDT2907A-7 contains two PNP transistors with reversed emitter-collector assignments. Direct substitution without circuit redesign will cause functional failure.

What is the maximum allowable junction temperature during continuous operation?

The absolute maximum junction temperature T_j for MMDT2222A-7 is +150°C, as specified in the Absolute Maximum Ratings table. Operation at this temperature requires strict derating of P_D per Figure 1 - at 100°C ambient, maximum dissipation drops to ~80 mW. Thermal design must ensure R_JA ≤ 625 °C/W on the actual PCB layout.

Does the "-7" suffix indicate tape-and-reel packaging, and what is the reel quantity?

Yes, the "-7" suffix denotes SOT-363 packaging in 3000-unit tape-and-reel format, per Diodes Incorporated's Ordering Information table. This is the standard shipping configuration for automated SMT assembly and qualifies for full RoHS compliance when ordered without the "-F" suffix (which is redundant, as -7 is already lead-free).

Can MMDT2222A-7 be used in linear amplifier mode with stable bias?

Yes, MMDT2222A-7 supports linear operation with proper emitter degeneration and thermal stabilization. Its h_FE variation across I_C (Figure 2) and low noise figure (NF = 4.0 dB at 1 kHz) make it suitable for preamplifier stages, though gain flatness above 10 MHz degrades due to f_T-limited bandwidth; DC bias must avoid exceeding V_CEO = 40 V and P_D = 200 mW limits.