Diodes Incorporated DDTC123EKA-7-F

Overview

DDTC123EKA-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor in SC-59 package with integrated R1 = R2 = 2.2 kΩ bias resistors, V_CC = 50 V max, I_O = 100 mA, P_D = 200 mW, and DC current gain (h_FE) ≥20 at I_C = 20 mA - used for digital switching in logic-level interface circuits.

For engineers reviewing the DDTC123EKA-7-F datasheet, DDTC123EKA-7-F pinout, DDTC123EKA-7-F application, or DDTC123EKA-7-F equivalent, key selection criteria include input voltage thresholds (V_IN(on) = 1.9 V typ, V_IN(off) = 1.1 V max), output saturation voltage (V_CE(SAT) = 0.3 V max at 20 mA), resistor tolerance (±30%), and thermal resistance (R_θJA = 625 °C/W).

Technical Context

This device integrates matched base-emitter and base-collector bias resistors (R1 = R2 = 2.2 kΩ) to simplify digital input stage design, eliminating external bias components. It operates as a single-transistor inverter with defined logic thresholds and guaranteed turn-on/turn-off behavior across -55°C to +150°C.

The SC-59 package supports surface-mount assembly with JEDEC-compliant pad layout, moisture sensitivity level 1, and RoHS-compliant matte tin plating. Its f_T = 250 MHz enables stable operation in low-speed digital switching up to ~10 MHz edge rates without oscillation.

Key Specifications

Pinout & Package

Package: SC-59 - surface-mount, 3-pin plastic molded case (UL 94V-0), 0.008 g weight, 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 DDTC143EKA-7-F, DDTC123EKA-7-F offers faster turn-on at lower input voltage, while NSVD123ET1G provides superior thermal management in compact layouts - choice depends on noise environment, footprint constraints, and junction temperature budget.

Availability

DDTC123EKA-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO interfaces, industrial sensor conditioning, and power sequencing control requiring stable component supply and consistent parametric performance across production lots.

Supply support for DDTC123EKA-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 applications.

This part belongs to the DDTC R1 = R2 series of pre-biased transistors, designed specifically to replace discrete BJT + resistor combinations in digital logic interface and low-power switching applications.

FAQ

What is the maximum operating temperature for DDTC123EKA-7-F?

The device supports junction and storage temperatures from -55°C to +150°C. At 25°C ambient, its 200 mW power dissipation limit corresponds to a 125°C junction rise (625 °C/W × 0.2 W). Derating is required above 25°C per Figure 1 - e.g., at 75°C ambient, max P_D drops to 100 mW.

Can DDTC123EKA-7-F be used as a direct replacement for a standard 2N3904 with external bias resistors?

Yes - it replaces a 2N3904 plus two 2.2 kΩ resistors in common-emitter switch configurations. However, its fixed R1/R2 ratio and guaranteed V_IN(on)/V_IN(off) provide more predictable switching thresholds than discrete designs subject to resistor tolerance and layout parasitics.

Is the SC-59 package compatible with standard SMT reflow profiles?

Yes - rated MSL Level 1 per J-STD-020C, meaning it can be stored indefinitely at ≤30°C/60% RH and processed using standard lead-free reflow profiles (peak 260°C) without baking. Its UL 94V-0 mold compound withstands multiple thermal cycles without delamination.

Does DDTC123EKA-7-F support bidirectional signal translation?

No - it functions only as a unidirectional NPN switch (input at pin 3, output at pin 2, emitter grounded). It lacks internal protection diodes or level-shifting circuitry required for bidirectional bus applications like I²C; use dedicated bus buffers for such cases.