Diodes Incorporated DDTC144WUA-7

Overview

DDTC144WUA-7 from Diodes Incorporated is a 50V NPN pre-biased transistor in SOT323 package, featuring integrated R1 = 47kΩ and R2 = 22kΩ bias resistors. It delivers 30mA max output current, 56 DC current gain at 5mA I_C, and V_IN(on) = 4.0V (I_OUT = 2mA), enabling direct logic-level interface in compact load-switching circuits.

For engineers reviewing the DDTC144WUA-7 datasheet, DDTC144WUA-7 pinout, DDTC144WUA-7 application, or DDTC144WUA-7 equivalent, this device serves as a space-optimized, RoHS-compliant digital switching element for low-power signal routing, LED drive, and microcontroller I/O expansion where resistor-biased transistor simplicity and SOT323 footprint are critical.

Technical Context

This NPN pre-biased transistor integrates two discrete resistors (R1 = 47kΩ, R2 = 22kΩ) on-die to eliminate external bias components. Its V_IN(on) of 4.0V at 2mA I_OUT ensures compatibility with 3.3V and 5V logic families, while V_CE(sat) ≤ 0.3V at I_C/I_B = 5mA/0.25mA supports efficient low-loss switching.

The device operates across –55°C to +150°C, with 200mW power dissipation and 625°C/W junction-to-ambient thermal resistance on FR4 PCB. Its f_T = 250MHz enables stable operation in moderate-speed digital switching applications up to several MHz.

Key Specifications

Pinout & Package

Package: SOT323 - ultra-small surface-mount plastic package (2.15mm × 2.10mm × 0.95mm), optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN pre-biased transistor applications.

Compared with DDTC124XUA-7-F and DDTC143FUA-7-F, the DDTC144WUA-7 offers optimal balance for 3.3V/5V systems: its 4.0V V_IN(on) prevents false triggering from noise, while 47kΩ/22kΩ ratio provides stable bias under varying temperature and supply conditions.

Availability

DDTC144WUA-7 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller I/O expansion, and low-power load switching requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for DDTC144WUA-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, specializing in high-reliability, energy-efficient components for industrial, computing, consumer, and automotive markets.

This part belongs to the DDTC (R1≠R2 SERIES) UA family of pre-biased transistors, designed specifically to simplify digital switching designs by integrating matched bias resistors in miniature packages for space- and cost-sensitive applications.

FAQ

What is the maximum operating temperature for DDTC144WUA-7?

The DDTC144WUA-7 is rated for junction and storage temperatures from –55°C to +150°C. Its thermal resistance (R_θJA) is 625°C/W on FR4 PCB with minimum pad layout, meaning ambient temperature must remain ≤ +85°C to keep junction temperature below 150°C at full 200mW dissipation.

Can DDTC144WUA-7 replace a standard NPN transistor with external bias resistors?

Yes - it replaces a discrete NPN transistor plus two base resistors (R_B1, R_B2) with identical bias function. The internal R1 = 47kΩ and R2 = 22kΩ replicate the classic voltage-divider bias topology, simplifying layout and improving consistency across production units.

Is DDTC144WUA-7 qualified for automotive applications?

DDTC144WUA-7 itself is not AEC-Q101 qualified per the datasheet; however, Diodes offers automotive-grade variants (e.g., DDTC144WUAQ-7) with PPAP capability and IATF 16949 manufacturing. Standard DDTC144WUA-7 is intended for industrial and commercial use.

What does the marking 'N22' on the SOT323 package indicate?

'N22' is the top-side marking for DDTC144WUA-7-F: 'N' denotes the product type code, and '22' identifies this specific R1/R2 combination (47kΩ/22kΩ) within the DDTC UA series. Date code follows separately (e.g., 'K' = 2023, 'D' = December).