Diodes Incorporated DDTC144EKA-7-F

Overview

DDTC144EKA-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor in SC-59 package with integrated R1 = R2 = 47 kΩ bias resistors, 50 V V_CEO, 100 mA I_C(max), 200 mW P_D, and 68× DC current gain (h_FE) at I_C = 5 mA - used for level-shifting and digital switching in compact logic interface circuits.

For engineers reviewing the DDTC144EKA-7-F datasheet, DDTC144EKA-7-F pinout, DDTC144EKA-7-F application, or DDTC144EKA-7-F equivalent, key selection criteria include input voltage threshold (V_IN(on) = 1.9 V typ), output saturation voltage (V_CE(sat) = 0.1 V typ at I_C/I_B = 10 mA/0.5 mA), thermal resistance (625 °C/W), and RoHS-compliant green molding compound compliance.

Technical Context

This device integrates matched 47 kΩ base bias resistors (R1 = R2) to configure a single-transistor inverter with defined turn-on/off thresholds, eliminating external bias components. It operates as a digital switch with guaranteed V_IN(off) ≤ 1.1 V and V_IN(on) ≥ 1.9 V at V_CC = 5 V, supporting TTL- and CMOS-compatible logic interfacing.

The SC-59 package enables surface-mount assembly on FR4 PCBs with J-STD-020C Level 1 moisture sensitivity, and its epitaxial planar die construction ensures stable h_FE (68× min) and f_T = 250 MHz performance under 10 V V_CE, 5 mA I_E conditions.

Key Specifications

Pinout & Package

Package: SC-59 - surface-mount, 3-terminal plastic package with 0.008 g mass, UL 94V-0 flammability rating, and matte tin-plated copper leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSV14400T1G and EMH14F, DDTC144EKA-7-F delivers superior saturation voltage (0.1 V vs. 0.3 V), higher power handling (200 mW vs. 150 mW), and lower thermal resistance (625 °C/W), making it optimal for dense, high-reliability digital interface designs.

Availability

DDTC144EKA-7-F is available at Aetrix Electronics and suitable for microcontroller GPIO interfaces, LED driver circuits, logic-level translators, and small-signal relay drivers requiring stable component supply and long-term industrial availability.

Supply support for DDTC144EKA-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, specializing in high-reliability, energy-efficient components for industrial, computing, and consumer markets.

This part belongs to the DDTC R1 = R2 series of pre-biased transistors, designed specifically to simplify digital switching and logic interface design by integrating matched bias resistors into standardized SMT packages.

FAQ

What is the function of Pin 1 (Emitter) in DDTC144EKA-7-F?

Pin 1 is the emitter terminal and serves as the common reference node for both input and output paths. Internally, it connects to the lower end of the R2 bias resistor and provides the return path for base and collector currents. It must be tied to system ground or the lowest potential rail in inverter configurations to ensure proper biasing and switching behavior.

Can DDTC144EKA-7-F replace a standard 2N3904 with external resistors?

Yes - it replaces a 2N3904 plus two 47 kΩ base resistors in inverter or switch applications. Its integrated R1 = R2 network provides identical biasing functionality while reducing PCB area, assembly steps, and component count. However, unlike discrete solutions, its fixed resistor values and topology do not allow adjustment of switching thresholds or gain.

Is DDTC144EKA-7-F suitable for 1.8 V logic input signals?

No - its V_IN(on) is specified at 1.9 V (typical) with minimum 1.1 V guarantee, meaning 1.8 V inputs may not reliably saturate the transistor. For 1.8 V systems, consider DDTC123EKA-7-F (V_IN(on) = 1.1 V typ) or verify actual turn-on behavior under target operating conditions using the VI–IC curves in Figure 6.

What does the "-7-F" suffix indicate in the part number?

The "-7-F" suffix denotes tape-and-reel packaging: "7" indicates 3000 units per reel, and "F" specifies lead-free, RoHS-compliant finish. This matches Diodes Incorporated's standard ordering code for SC-59 devices shipped in EIA-481-compliant carrier tape with 8 mm width and 4 mm pitch.