Diodes Incorporated DDTC144GKA-7-F

Overview

DDTC144GKA-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor with built-in R2 bias resistor (47 kΩ), SC-59 package, V_CEO = 50 V, I_C(max) = 100 mA, and h_FE = 68 at I_C = 5 mA, used in digital logic interface and level-shifting circuits.

For engineers reviewing the DDTC144GKA-7-F datasheet, DDTC144GKA-7-F pinout, DDTC144GKA-7-F application, or DDTC144GKA-7-F equivalent, key selection factors include verified R2-only biasing topology, guaranteed h_FE min of 68, SC-59 thermal resistance (625 °C/W), and ESD-safe handling per J-STD-020C Level 1 moisture sensitivity.

Technical Context

This device implements a single-NPN transistor with internal base-emitter resistor network where only R2 (47 kΩ) is integrated - no R1 - enabling fixed-current-sink configuration for direct microcontroller GPIO interfacing. It operates within -55°C to +150°C and supports 50 V collector-base and collector-emitter breakdown ratings.

The transistor delivers V_CE(sat) ≤ 0.3 V at I_C = 10 mA / I_B = 0.5 mA, exhibits f_T = 250 MHz, and maintains I_EBO = 65 μA max at V_EB = 4 V, confirming stable cutoff behavior under reverse-biased emitter conditions.

Key Specifications

Pinout & Package

Package: SC-59 - surface-mount plastic package with three terminals (Emitter, Base, Collector), 0.006 g mass, UL 94V-0 flammability rating, and J-STD-020C Level 1 moisture sensitivity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTC124GKA-7-F and DDTC115GKA-7-F, the DDTC144GKA-7-F strikes a balance between base drive efficiency and gain margin - its 47 kΩ R2 provides adequate noise immunity while maintaining h_FE ≥ 68 for robust saturation across voltage and temperature extremes.

Availability

DDTC144GKA-7-F is available at Aetrix Electronics and suitable for industrial control interfaces, LED driver staging, and microcontroller signal conditioning requiring stable component supply and full traceability.

Supply support for DDTC144GKA-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.

This part belongs to the DDTC R2-Only Series - a family of pre-biased NPN transistors engineered specifically for simplified digital interface design in space-constrained, cost-sensitive applications such as portable electronics and IoT edge nodes.

FAQ

What is the function of the internal R2 resistor in DDTC144GKA-7-F?

The internal R2 resistor (47 kΩ ±30%) connects the base to the emitter, forming a fixed-current-sink bias network. It enables direct connection to logic outputs without external resistors, ensuring reliable transistor turn-on when the base is driven high, and guarantees defined cutoff when the base is floating or pulled low.

Can DDTC144GKA-7-F replace a standard 2N3904 with external biasing?

Yes - but only in circuits where the R2-only topology matches the required bias scheme. Unlike the 2N3904, it lacks R1, so it cannot replicate voltage-divider bias. It is ideal for simple saturated-switch applications where the base is driven actively high/low, not for linear amplifier use.

Is DDTC144GKA-7-F suitable for automotive applications?

It meets AEC-Q101 stress test requirements per Diodes Incorporated's qualification report for the DDTC KA series. Its -55°C to +150°C operating range, Pb-free construction, and 50 V breakdown ratings support under-hood and body-control module use, provided board-level thermal design respects the 625 °C/W R_θJA.

How does the SC-59 package differ from SOT-23?

SC-59 is dimensionally identical to JEDEC-standard SOT-23 (same pin pitch, body width, and terminal layout), but specifies tighter mold compound and plating controls. Diodes uses SC-59 to denote devices qualified to their internal green-material and moisture-sensitivity standards, ensuring compatibility with automated assembly processes.