Diodes Incorporated DCX124EK-7-F

Overview

DCX124EK-7-F from Diodes Incorporated is a dual complementary pre-biased transistor in SOT26 package, integrating one NPN and one PNP small-signal transistor with built-in 22 kΩ base bias resistors (R1 = R2 = 22 kΩ) per section. It supports ±50 V collector-emitter breakdown voltage, delivers ±30 mA output current per section, and operates across –55 °C to +150 °C for automotive and industrial logic interface applications.

For engineers reviewing the DCX124EK-7-F datasheet, DCX124EK-7-F pinout, DCX124EK-7-F application, or DCX124EK-7-F equivalent, key selection criteria include input threshold voltage (V_I(OFF) = ±0.5 V at V_CC = ±5 V), on-state output voltage (V_O(ON) ≤ ±0.3 V), DC current gain (G_L = 80 min), resistor tolerance (±30%), and thermal resistance (R_θJA = 417 °C/W).

Technical Context

This device implements a dual-channel, complementary pre-biased transistor topology where each channel integrates emitter-follower or common-emitter switching functionality with monolithically embedded base resistors. The NPN and PNP sections share identical bias resistor values (22 kΩ), enabling matched turn-on/off behavior in push-pull or level-shifting configurations.

Each section features BVCBO = ±50 V, BVCEO = ±50 V, and VCE(sat) ≤ ±0.3 V at IC/IB = ±2.5 mA / ±0.25 mA. The device achieves hFE = 100–600 (IC = ±1 mA, VCE = ±5 V) and transition frequency fT = 250 MHz (VCE = ±10 V, IE = ∓5 mA), supporting high-speed digital switching up to ~10 MHz.

Key Specifications

Pinout & Package

SOT26 surface-mount package: 6-pin, molded plastic case (UL 94V-0), matte tin-plated leads, 0.016 g weight. Dimensions: D = 3.00 mm, E = 2.80 mm, E1 = 1.60 mm, L = 0.40 mm, b = 0.38 mm, c = 0.15 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DCX124EK-7-F, DCX114EK-7 offers higher drive strength but reduced noise margin, while DCX115EK-7-F prioritizes input sensitivity and quiescent current over switching speed-making DCX124EK-7-F the balanced choice for general-purpose 3.3 V/5 V logic interfacing.

Availability

DCX124EK-7-F is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and consumer appliance motor interface applications requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.

Supply support for DCX124EK-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 IATF 16949-certified facilities.

The DCX series targets cost-sensitive, space-constrained digital interface applications, delivering integrated biasing and complementary pairing to replace discrete transistor-resistor combinations in automotive, industrial, and consumer electronics.

FAQ

What is the maximum operating temperature for DCX124EK-7-F?

The device is rated for junction temperatures from –55 °C to +150 °C. At ambient temperatures up to +85 °C, it can dissipate its full 300 mW power rating when mounted on FR-4 with minimum recommended pad layout. Derating begins above +85 °C at 0.72 mW/°C based on R_θJA = 417 °C/W.

Can DCX124EK-7-F replace discrete transistors and resistors in existing designs?

Yes-it replaces two small-signal transistors plus four bias resistors (two per transistor). Pin compatibility with standard SOT26 footprints allows drop-in replacement if layout accommodates the 6-pin configuration. Verify V_I(ON)/V_I(OFF) thresholds match your controller's logic levels before migration.

Is DCX124EK-7-F qualified for automotive applications?

The base part is not AEC-Q101 qualified, but Diodes offers an automotive-grade version with PPAP documentation and IATF 16949 manufacturing. Contact Diodes or Aetrix Electronics for the AEC-Q101-compliant variant, which includes extended temperature testing, failure analysis, and change control protocols required for automotive BCU and lighting modules.

How does the built-in resistor network affect switching speed?

R1 = R2 = 22 kΩ limits base charging/discharging current, resulting in typical turn-on/turn-off times of ~150 ns (measured at V_CC = 5 V, I_O = 10 mA). This is sufficient for <10 MHz digital signaling but unsuitable for RF or high-frequency PWM. For faster switching, consider DCX123JK-7 (R1 = 2.2 kΩ) or discrete solutions.