Diodes Incorporated MMBT2907AT-7

Overview

MMBT2907AT-7 from Diodes Incorporated is a PNP small-signal surface-mount transistor in SOT-523 package, rated for -60 V V_CEO, -600 mA I_C, 150 mW P_D, with h_FE = 75–300 (at I_C = -100 µA to -500 mA), and f_T = 200 MHz - used in low-power switching and amplification stages of portable DC-DC converters and LED bias circuits.

For engineers reviewing the MMBT2907AT-7 datasheet, MMBT2907AT-7 pinout, MMBT2907AT-7 application, or MMBT2907AT-7 equivalent, key selection criteria include verified PNP saturation voltage (-0.4 V at I_C = -150 mA/I_B = -15 mA), thermal resistance (833 °C/W), lead-free plating compliance, and SOT-523 footprint compatibility with space-constrained PCB layouts.

Technical Context

This PNP bipolar junction transistor employs epitaxial planar die construction for stable gain and low leakage across -55°C to +150°C operation. Its complementary NPN counterpart is the MMBT2222AT, enabling matched pair design in differential amplifiers and push-pull drivers.

Electrical behavior is characterized by three distinct h_FE ranges (75–100, 100–100, 50–300) depending on collector current, and switching performance defined by t_on = 45 ns, t_off = 100 ns, and storage time t_s = 80 ns under specified V_CC = -6.0 V conditions.

Key Specifications

Pinout & Package

Package: SOT-523 - ultra-small surface-mount plastic case (UL 94V-0), dimensions A=0.22 mm, B=0.80 mm, C=1.60 mm, D=0.50 mm, G=1.00 mm, H=1.60 mm, J=0.05 mm, K=0.75 mm, L=0.22 mm, M=0.12 mm, N=0.50 mm; moisture sensitivity level 1 per J-STD-020A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT2907AL, the MMBT2907AT-7 trades thermal headroom for 60% smaller footprint; versus DXT2907AP5-7, it offers broader h_FE tolerance at lower cost, making it optimal for cost-sensitive consumer switching applications.

Availability

MMBT2907AT-7 is available at Aetrix Electronics and suitable for portable power management, LED bias control, automotive cabin sensors, and industrial signal conditioning requiring stable component supply across high-mix, low-volume production runs.

Supply support for MMBT2907AT-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 centers across Asia and manufacturing in Taiwan and China.

The MMBT2907AT-7 belongs to Diodes' small-signal transistor product line, engineered specifically for space-constrained, low-power linear and switching applications in consumer, computing, and industrial end-equipment.

FAQ

What is the maximum allowable junction temperature for MMBT2907AT-7?

The absolute maximum junction temperature is +150°C, as specified in the "Operating and Storage Temperature Range" section. Derating begins immediately above 25°C ambient, with linear reduction to zero power at +150°C per the Fig. 1 power derating curve. Thermal design must account for R_JA = 833 °C/W on standard FR-4 layout.

Is MMBT2907AT-7 compatible with lead-free reflow processes?

Yes - the device uses matte tin lead-free plating and meets JEDEC J-STD-020A Level 1 moisture sensitivity requirements. It supports peak reflow temperatures up to 260°C for ≤10 seconds, with no pre-bake required, as confirmed in the Mechanical Data section and Ordering Information Note 4.

How does the h_FE variation affect circuit design?

h_FE spans 75–300 depending on collector current, so bias networks must be designed for worst-case gain - e.g., using emitter degeneration resistors or feedback to maintain stability. For switching, ensure sufficient base drive (I_B ≥ I_C/10) even at minimum h_FE = 75 to guarantee saturation.

Can MMBT2907AT-7 replace MMBT2907A in existing SOT-23 designs?

No - MMBT2907AT-7 uses SOT-523 (1.6 × 0.8 mm), while MMBT2907A uses SOT-23 (3.0 × 1.4 mm); pinout is identical (E-B-C), but mechanical fit and thermal performance differ significantly. Direct replacement requires PCB redesign and validation of thermal margin due to higher R_JA.