Diodes Incorporated DDTD113ZU-7-F

Overview

DDTD113ZU-7-F from Diodes Incorporated is an NPN pre-biased transistor in SOT323 package, featuring integrated 1 kΩ and 10 kΩ bias resistors. It delivers V_I(OFF) = 0.3 V, V_I(ON) = 3.0 V (at I_O = 20 mA), V_CE(SAT) ≤ 0.3 V (I_C = 50 mA), and DC current gain G_L = 56, optimized for low-power digital switching in logic interface circuits.

For engineers reviewing the DDTD113ZU-7-F datasheet, DDTD113ZU-7-F pinout, DDTD113ZU-7-F application, or DDTD113ZU-7-F equivalent, key selection criteria include input threshold voltage compatibility with 3.3 V/5 V logic families, guaranteed saturation under 20 mA load, resistor ratio stability across temperature, and SOT323 footprint suitability for space-constrained PCB layouts.

Technical Context

This device integrates two precision thin-film resistors (R1 = 1 kΩ, R2 = 10 kΩ) directly on the die to configure base biasing for predictable turn-on/turn-off behavior without external components. Its epitaxial planar construction ensures stable β and f_T = 200 MHz performance at V_CE = 10 V, I_E = 5 mA.

The SOT323 package supports automated placement and reflow, with thermal resistance R_θJA = 500 °C/W on FR4 and a maximum power dissipation of 250 mW. Absolute ratings include V_CC = 50 V, V_EBO = 5 V, and operating temperature range from –55 °C to +150 °C.

Key Specifications

Pinout & Package

Package: SOT323 - ultra-small surface-mount plastic package (2.15 mm × 2.10 mm × 0.95 mm), lead-free, halogen-free, moisture sensitivity level 1, matte tin-plated terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTD113EU-7-F, DDTD113ZU-7-F offers tighter V_I(OFF) for improved low-voltage compatibility, while EMD2P10100GUX trades single-channel performance for dual functionality-making DDTD113ZU-7-F optimal for cost-sensitive, space-constrained 3.3 V logic switching where gain and threshold precision are critical.

Availability

DDTD113ZU-7-F is available at Aetrix Electronics and suitable for LED indicator drivers, microcontroller GPIO expansion, power sequencing control, and reset signal conditioning requiring stable component supply and long-term production continuity.

Supply support for DDTD113ZU-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, energy-efficient components for industrial, computing, consumer, and automotive markets.

The DDTD series targets logic interface and digital switching applications, designed to replace discrete transistor-resistor combinations with monolithic, tested, and thermally optimized solutions for compact, high-yield PCB assembly.

FAQ

What is the maximum continuous collector current for DDTD113ZU-7-F?

The absolute maximum collector current is 500 mA, but the device is characterized for reliable operation up to 50 mA with V_CE(SAT) ≤ 0.3 V and thermal derating applied above 75 °C ambient. For sustained 50 mA loads, ensure PCB copper area meets minimum pad layout guidelines (FR4, 1 oz, single-sided) to maintain junction temperature within –55 °C to +150 °C limits.

Can DDTD113ZU-7-F be used in automotive applications?

DDTD113ZU-7-F is manufactured in IATF 16949 certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101, it is eligible for automotive qualification upon customer request and program-specific testing. Diodes provides change control and lot traceability required for Tier 1 supply chains.

How does the internal resistor network affect input impedance?

The 1 kΩ/10 kΩ resistor divider sets a nominal input impedance of ~11 kΩ at the base terminal. This allows direct connection to 3.3 V/5 V logic outputs without loading concerns, while ensuring sufficient base current (e.g., ~2.7 mA at 3.0 V input) to achieve full saturation at 50 mA collector current.

Is there a recommended PCB layout for thermal performance?

Yes - use the Diodes-recommended SOT323 pad layout: 0.65 mm pitch, 0.47 mm × 0.60 mm pads, 2.5 mm overall length. Thermal relief traces should be minimized; for >100 mW average dissipation, add thermal vias under the collector pad connected to inner ground/power planes to reduce R_θJA below 300 °C/W.