Diodes Incorporated DDTC123EE-7-F

Overview

DDTC123EE-7-F from Diodes Incorporated is an NPN pre-biased transistor in SOT523 package with integrated bias resistors (R1 = R2 = 2.2 kΩ), V_CEO = 50 V, I_C(max) = 100 mA, and DC current gain (h_FE) ≥20 at I_C = 20 mA, used for logic-level signal switching in space-constrained consumer and industrial control circuits.

For engineers reviewing the DDTC123EE-7-F datasheet, DDTC123EE-7-F pinout, DDTC123EE-7-F application, or DDTC123EE-7-F equivalent, key selection criteria include input voltage thresholds (V_IN(OFF) ≤ 1.1 V, V_IN(ON) ≥ 1.9 V), output saturation voltage (V_CE(SAT) ≤ 0.3 V @ I_C/I_B = 20), thermal resistance (R_θJA = 833 °C/W), and AEC-Q101 readiness for automotive-grade designs.

Technical Context

This device integrates a single NPN transistor with two matched 2.2 kΩ base bias resistors (R1 = R2) to form a monolithic inverter circuit, eliminating external bias components. It operates as a digital switch with guaranteed turn-on at V_IN ≥ 1.9 V and turn-off at V_IN ≤ 1.1 V under standard test conditions (V_CC = 5 V).

The SOT523 package enables high-density PCB layouts, while its 150 mW power dissipation rating and -55°C to +150°C operating range support use in thermally demanding environments. Transition frequency f_T = 250 MHz confirms suitability for low-speed digital switching-not RF amplification.

Key Specifications

Pinout & Package

SOT523 is a 3-pin ultra-small surface-mount plastic package (1.60 mm × 1.60 mm × 0.75 mm), rated UL 94V-0, moisture sensitivity level 1, and compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTC123EE-7-F, DDTC143EE-7-F trades lower input sensitivity for improved noise immunity, while NSVD123ET1G offers identical biasing with enhanced thermal robustness and formal automotive qualification-making it preferable for safety-critical deployments despite larger size.

Availability

DDTC123EE-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, and automotive door module signal conditioning requiring stable component supply and consistent parametric performance across production lots.

Supply support for DDTC123EE-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, manufacturing, and sales operations across Asia, Europe, and the Americas.

This part belongs to the DDTC (R1 = R2 Series) pre-biased transistor family, engineered specifically to reduce component count and improve reliability in digital switching applications across consumer, industrial, and automotive electronics.

FAQ

What is the maximum safe operating voltage for DDTC123EE-7-F?

The absolute maximum collector-emitter voltage (V_CEO) is 50 V, verified per DS30313 Rev. 16-2 Section 4. Exceeding this rating risks avalanche breakdown. For continuous 24 V rail operation, a 2× safety margin is maintained; transient spikes must be clamped externally if exceeding 50 V.

Can DDTC123EE-7-F replace a standard 2N3904 with external bias resistors?

Yes-it replaces a 2N3904 plus two 2.2 kΩ resistors in common-emitter switch configurations. Its integrated R1=R2=2.2 kΩ network provides identical biasing, but with tighter resistor matching (±30% absolute, 0.8–1.2% ratio), reduced parasitic inductance, and smaller footprint than discrete equivalents.

Is DDTC123EE-7-F qualified for automotive use?

While not pre-qualified, DDTC123EE-7-F is manufactured in IATF 16949-certified facilities and supports PPAP documentation. Diodes states it meets requirements for automotive applications "requiring specific change control" (DS30313 p.1); formal AEC-Q101 testing must be requested per project.

What is the typical input current at 5 V supply?

At V_IN = 5 V, the input current (I_L) is 3.8 mA (typical), calculated from the 2.2 kΩ input resistor network. This value is confirmed in the Electrical Characteristics table (p.3, DS30313) and remains stable across -55°C to +125°C per Fig. 5.