Diodes Incorporated DDTC124GKA-7-F

Overview

DDTC124GKA-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor with built-in 22 kΩ base bias resistor (R2 only), SC-59 package, V_CEO = 50 V, I_C(max) = 100 mA, and h_FE = 56 at I_C = 5 mA, used in discrete logic-level switching and signal conditioning circuits.

For engineers reviewing the DDTC124GKA-7-F datasheet, DDTC124GKA-7-F pinout, DDTC124GKA-7-F application, or DDTC124GKA-7-F equivalent, key selection criteria include R2 tolerance (±30%), V_CE(sat) ≤ 0.3 V at I_C/I_B = 10, thermal resistance (625 °C/W), and JEDEC SC-59 footprint compatibility.

Technical Context

This device integrates a single NPN silicon epitaxial planar transistor with a monolithic 22 kΩ pull-up base resistor (R2), eliminating external bias components. It operates as a digital switch with guaranteed saturation under I_C/I_B = 10, supporting 5 V and 3.3 V logic interfacing.

The SC-59 package enables high-density surface-mount placement with UL 94V-0 flammability rating and moisture sensitivity level 1. Electrical performance is specified across –55 °C to +150 °C, with f_T = 250 MHz enabling moderate-frequency switching applications.

Key Specifications

Pinout & Package

Package: SC-59 (JEDEC TO-236AB), 3-terminal surface-mount plastic package with matte tin-plated copper leadframe, UL 94V-0 rated molding compound, and moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTC114GKA-7-F and DDTC144GKA-7-F, the DDTC124GKA-7-F strikes a balance between base drive efficiency and saturation robustness-its 22 kΩ R2 delivers optimal I_B for 3.3 V/5 V logic while maintaining strong h_FE and low V_CE(sat) across temperature.

Availability

DDTC124GKA-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO interfaces, and low-power relay control requiring stable component supply and full RoHS compliance.

Supply support for DDTC124GKA-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, cost-optimized components for industrial, computing, and consumer markets.

The DDTC R2-only series targets space-constrained digital interface applications where integration of biasing resistors improves yield, reduces assembly steps, and enhances thermal predictability in SMT production.

FAQ

What is the function of the internal R2 resistor in DDTC124GKA-7-F?

The internal R2 resistor is a 22 kΩ pull-up resistor connected between base and collector. It provides automatic base biasing, enabling the transistor to operate as a saturated switch with only two external connections (collector and emitter). This eliminates the need for an external base resistor in digital switching applications, simplifying design and reducing PCB area.

Can DDTC124GKA-7-F replace a standard NPN transistor like 2N3904?

It can replace a 2N3904 in saturated-switch applications where the circuit uses base biasing through a collector-connected resistor, but not in linear amplifier or emitter-follower configurations requiring adjustable bias. The integrated R2 fixes the bias ratio, so direct substitution requires verifying that the existing base resistor value aligns with 22 kΩ and that V_CE(sat) and h_FE meet system timing and drive requirements.

Is DDTC124GKA-7-F suitable for automotive applications?

Yes-its operating temperature range of –55 °C to +150 °C, AEC-Q200 stress test capability (per Diodes Inc. qualification), and green molding compound make it suitable for non-safety-critical automotive applications such as body control modules, lighting control, and sensor interface circuits. It is not qualified for airbag or braking systems without additional system-level validation.

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

The "-7-F" suffix denotes tape-and-reel packaging: "7" specifies 3000 units per reel, and "F" indicates lead-free (RoHS-compliant) finish with matte tin plating on the copper leadframe. This packaging format is optimized for high-speed SMT placement and conforms to IPC-7351 standards for SC-59 footprints.