Diodes Incorporated MMBTA13-7-F

Overview

MMBTA13-7-F from Diodes Incorporated is a 30V NPN Darlington transistor in SOT23 package, designed for medium-power amplification and switching with minimum DC current gain (h_FE) of 5,000 at I_C = 10mA, V_CE = 5V, and maximum power dissipation of 300 mW at T_A = 25°C. It features low saturation voltage (V_CE(sat) ≤ 1.5V at I_C = 100mA, I_B = 100µA) and high ESD robustness (HBM 4,000V), commonly used in relay drivers and low-frequency signal amplification stages.

For engineers reviewing the MMBTA13-7-F datasheet, MMBTA13-7-F pinout, MMBTA13-7-F application, or MMBTA13-7-F equivalent, key selection criteria include verified Darlington configuration, SOT23 thermal derating behavior, complementary PNP pairing (MMBTA63), and suitability for non-automotive industrial control circuits where high β and low base drive are required.

Technical Context

This device implements a monolithic two-stage NPN Darlington structure, delivering high current gain without external bias network complexity. Its V_CEO = 30V and V_EBO = 10V define safe operating limits for emitter-referenced switching topologies, while f_T = 125MHz supports stable operation up to audio frequencies.

The SOT23 package enables surface-mount integration with R_θJA = 417°C/W on minimal FR-4 pad layout, and its 0.008g mass supports lightweight PCB designs. Pinout follows standard SOT23 emitter-collector-base (E-C-B) orientation, confirmed by Diodes' top-view diagram and marking "K3D".

Key Specifications

Pinout & Package

Package: SOT23 - Surface-mount plastic package with matte tin terminals, moisture sensitivity level 1 (J-STD-020), UL 94V-0 flammability rating, and 0.008g typical weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBTA14-7-F, this part trades peak gain for tighter h_FE distribution at moderate currents; versus PN2222A-AP, it delivers 50× higher current gain in the same SOT23 footprint but with higher V_BE(sat) and reduced f_T, making it optimal for DC/low-frequency switching rather than RF or fast digital edges.

Availability

MMBTA13-7-F is available at Aetrix Electronics and suitable for relay drivers, LED current controllers, low-frequency amplifiers, and interface level shifters requiring stable component supply and consistent SOT23 assembly compatibility.

Supply support for MMBTA13-7-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, manufacturing, and sales operations across Asia, Europe, and North America.

The MMBTA13 belongs to Diodes' general-purpose bipolar transistor product line, engineered for cost-sensitive industrial, consumer, and computing applications where high DC gain, SMT compatibility, and RoHS compliance are prioritized over high-speed or high-voltage operation.

FAQ

What is the maximum continuous collector current for MMBTA13-7-F?

The absolute maximum collector current is 300 mA per the datasheet's Absolute Maximum Ratings table. However, sustained operation above 100 mA requires careful thermal management due to the 300 mW power limit and 417°C/W junction-to-ambient thermal resistance-derating begins immediately above 25°C ambient temperature per Figure 1.

Is MMBTA13-7-F qualified for automotive applications?

No-MMBTA13-7-F is not AEC-Q101 qualified. Diodes explicitly states that automotive-grade versions require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for industrial and commercial use only. For automotive designs, contact Diodes directly for qualified alternatives like the DXT1300 series.

How does the Darlington configuration affect base-emitter voltage?

The Darlington pair results in a composite V_BE(sat) ≈ 1.4–2.0 V (measured at I_C = 100 mA), roughly double that of a single NPN transistor, due to two series-connected base-emitter junctions. This necessitates higher base drive voltage and impacts logic-level interfacing-microcontrollers with 3.3V outputs may require series base resistors to limit current.

Can MMBTA13-7-F replace MMBT2222A in existing designs?

Not directly-MMBT2222A is a standard NPN transistor (h_FE ~100–300), while MMBTA13-7-F is a Darlington (h_FE ≥5,000). Swapping requires recalculating base resistors and verifying saturation under load, as V_BE(sat) increases from ~0.7V to ~1.8V and switching speed decreases significantly due to lower f_T and higher stored charge.