Diodes Incorporated MMBTA13-7

Overview

MMBTA13-7 from Diodes Incorporated is a 30V NPN Darlington transistor in SOT23 package, delivering h_FE ≥5,000 at I_C = 10mA/V_CE = 5V, V_CE(sat) ≤1.5V at I_C = 100mA/I_B = 100µA, and P_D = 300mW. It serves as a medium-power switching and amplification device in low-voltage control circuits, relay drivers, and LED load interfaces.

For engineers reviewing the MMBTA13-7 datasheet, MMBTA13-7 pinout, MMBTA13-7 application, or MMBTA13-7 equivalent, key selection criteria include Darlington current gain stability, SOT23 thermal derating behavior, V_BE(sat) ≤2.0V at I_C = 100mA, and compatibility with 3.3V/5V logic-level base drive.

Technical Context

This NPN Darlington pair integrates two cascaded transistors to achieve high DC current gain while maintaining single-package simplicity. Its structure enables low base drive current requirements-e.g., 100µA base current suffices to switch 100mA collector load-with predictable saturation characteristics across -55°C to +150°C operating range.

Designed for non-automotive industrial and consumer applications, it features halogen- and antimony-free "Green" molding compound (UL 94V-0), matte tin terminals, and J-STD-020 Level 1 moisture sensitivity-making it suitable for standard reflow without preconditioning.

Key Specifications

Pinout & Package

Package: SOT23 - Surface-mount plastic package measuring 2.90 mm × 1.30 mm × 0.915 mm (L × W × H), with 0.95 mm lead pitch and 0.008 g mass. Compliant with JEDEC TO-236AB outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBTA13-7, MMBT2222A-7-F trades gain for speed and lower saturation voltage, while BC817-40-7-F offers higher current capacity but demands ~10× more base current-making MMBTA13-7 uniquely suited for ultra-low-drive, medium-power Darlington use cases.

Availability

MMBTA13-7 is available at Aetrix Electronics and suitable for relay driver circuits, LED array switching, low-voltage sensor interfaces, and power supply enable control requiring stable component supply and long-term obsolescence management.

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

The MMBTA13-7 belongs to Diodes' general-purpose bipolar transistor portfolio, engineered for cost-sensitive, high-volume industrial and consumer applications where reliability, RoHS compliance, and SOT23 scalability are critical.

FAQ

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

The absolute maximum rated collector current is 300 mA per the datasheet's Absolute Maximum Ratings table. However, practical continuous operation is limited by thermal dissipation: at 25°C ambient, 300 mW power limit restricts I_C to approximately 100 mA when V_CE(sat) ≈ 1.5 V. Derating is required above 25°C using R_θJA = 417°C/W.

Is MMBTA13-7 qualified for automotive applications?

No-MMBTA13-7 is not AEC-Q101 qualified. The datasheet 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 DXT13010 series.

Can MMBTA13-7 replace MMBTA14-7 in a circuit?

Yes, with caution: both share identical pinout, voltage ratings, and package, but MMBTA14-7 has higher h_FE (10,000–20,000 vs. 5,000–10,000). Substituting MMBTA13-7 for MMBTA14-7 may cause marginal turn-on in high-impedance base drive circuits or elevated V_CE(sat) under heavy load. Verify base current margin and saturation voltage in final design.

What is the recommended PCB pad layout for SOT23 mounting?

Diodes specifies a suggested SOT23 pad layout with dimensions C = 2.0 mm × 0.8 mm (land length × width), X1 = 1.35 mm, Y = 0.9 mm, and Y1 = 2.9 mm. Use 1 oz copper, ensure thermal relief for pin 3 (collector), and follow IPC-7351B standards for solder paste stencil design to prevent tombstoning during reflow.