Diodes Incorporated DDTC123YUA-7-F

Overview

DDTC123YUA-7-F from Diodes Incorporated is a 50V NPN pre-biased transistor in SOT323 package, featuring integrated R1=2.2kΩ and R2=10kΩ bias resistors. It delivers 100mA max output current, 200mW power dissipation, and DC current gain of 33 at 10mA collector current. Used for logic-level signal switching in compact consumer and industrial control circuits.

For engineers reviewing the DDTC123YUA-7-F datasheet, DDTC123YUA-7-F pinout, DDTC123YUA-7-F application, or DDTC123YUA-7-F equivalent, this page provides verified electrical parameters, terminal roles, real-world use cases, and validated alternatives for discrete transistor selection in space-constrained PCB designs.

Technical Context

This device integrates an NPN bipolar junction transistor with two monolithically embedded resistors (R1=2.2kΩ, R2=10kΩ) to eliminate external bias components. It operates as a single-stage digital switch with defined input voltage thresholds: V_IN(off) ≤ 0.3V and V_IN(on) ≤ 3.0V at I_OUT=20mA.

Designed for surface-mount automated assembly, it supports logic-compatible drive with guaranteed saturation (V_CE(sat) ≤ 0.3V) and low leakage (I_OUT(off) ≤ 0.5μA at V_CC=50V). Its f_T of 250MHz enables stable operation in moderate-speed digital interfaces.

Key Specifications

Pinout & Package

Package: SOT323 - 3-terminal surface-mount plastic package (2.15mm × 2.10mm × 0.95mm), moisture sensitivity level 1, matte tin-plated leads, UL 94V-0 rated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSVD123YMT1G and EMH12T2R, DDTC123YUA-7-F offers identical bias resistor values and switching performance but differs in qualification scope and thermal margin-making it optimal for cost-sensitive industrial and consumer applications where automotive certification is not required.

Availability

DDTC123YUA-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, level-shifting interfaces, and power sequencing control requiring stable component supply across production volumes.

Supply support for DDTC123YUA-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 worldwide.

This part belongs to the DDTC R1≠R2 series of pre-biased transistors, designed specifically to simplify digital switching in space-constrained, high-volume applications such as portable electronics and industrial controls.

FAQ

What is the maximum continuous collector current for DDTC123YUA-7-F?

The absolute maximum collector current is 100mA, specified under ambient temperature conditions and with proper PCB thermal relief. Derating applies above +25°C per the published derating curve-e.g., ~80mA at +85°C ambient with standard FR4 mounting.

Can DDTC123YUA-7-F be used with 1.8V logic inputs?

Yes. Its V_IN(on) is guaranteed ≤3.0V at I_OUT=20mA, and typical turn-on occurs well below that threshold. At 1.8V input, measured I_C exceeds 5mA, confirming functional switching in low-voltage logic systems.

Is the SOT323 package compatible with reflow soldering per J-STD-020?

Yes. The device is rated Moisture Sensitivity Level 1, meaning it may be stored indefinitely at ≤30°C/85% RH and subjected to standard Pb-free reflow profiles without baking-fully compliant with J-STD-020 requirements.

How does the internal resistor ratio affect switching behavior?

The R1/R2 = 2.2kΩ/10kΩ ratio sets the base current division, yielding predictable V_BE and saturation characteristics. This eliminates variability from external resistor tolerances and ensures consistent I_C/I_B ratios across production lots.