Diodes Incorporated DDTB114TC-7-F

Overview

DDTB114TC-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT23 package, featuring a single 10 kΩ base-emitter bias resistor (R1), open-circuit R2, −50 V collector-base breakdown voltage, −40 V collector-emitter breakdown voltage, and −5 V emitter-base breakdown voltage. It delivers h_FE = 100–600 at I_C = −5 mA, V_CE = −5 V, and supports switching applications in low-voltage logic interface circuits.

For engineers reviewing the DDTB114TC-7-F datasheet, DDTB114TC-7-F pinout, DDTB114TC-7-F application, or DDTB114TC-7-F equivalent, key selection criteria include verified BVEBO = −5 V, guaranteed h_FE range, SOT23 thermal resistance (R_θJA = 625 °C/W), and confirmed R1-only bias configuration for simplified NPN/PNP complementary driver design.

Technical Context

This device implements a discrete PNP bipolar junction transistor with integrated base-emitter pull-up resistor only-no second resistor (R2 = open). Its internal structure uses epitaxial planar die construction to ensure stable DC current gain and high-voltage blocking capability under reverse-biased conditions.

The transistor operates with V_CE(sat) ≤ −0.3 V at I_C = −50 mA / I_B = −2.5 mA and supports input voltage ranges up to −40 V on the collector and −5 V on the emitter, making it suitable for level-shifting and active-low signal conditioning where precise turn-on threshold and leakage control are required.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount plastic package with matte tin-plated leads, moisture sensitivity level 1, UL 94V-0 rated molding compound, and approximate weight of 0.008 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTB123TC-7-F and DDTB143TC-7-F, DDTB114TC-7-F provides highest input impedance (10 kΩ R1), lowest base current demand, and widest h_FE range-making it optimal for ultra-low-power enable/control functions where leakage and static power dominate design constraints.

Availability

DDTB114TC-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, and portable medical instrumentation requiring stable component supply and long-term obsolescence management.

Supply support for DDTB114TC-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 North America.

This part belongs to the DDTB series of pre-biased transistors, engineered specifically for reducing bill-of-materials count and improving reliability in digital interface, power control, and signal conditioning circuits.

FAQ

What is the function of the "open" R2 in DDTB114TC-7-F?

The "open" R2 means no internal resistor connects base to collector. This configuration prevents unintended feedback paths and allows full control over base biasing via the single R1 resistor from base to emitter. It ensures predictable turn-on thresholds and avoids gain instability in high-noise environments, especially when used as an inverter or level shifter with well-defined input voltage windows.

Can DDTB114TC-7-F be used in automotive applications?

Yes-DDTB114TC-7-F is manufactured in IATF 16949 certified facilities and supports AEC-Q101 qualification upon request with full PPAP documentation. Its −55 °C to +150 °C operating temperature range, green halogen-free packaging, and tested parametric stability across temperature and life testing make it suitable for under-hood and cabin electronics where reliability and change control are mandatory.

How does the 10 kΩ R1 value affect switching speed?

The 10 kΩ R1 increases base charging time, resulting in slower turn-on (t_on) compared to lower-R1 variants like DDTB123TC-7-F. However, it reduces standby current and improves noise immunity. Measured f_T remains 200 MHz, confirming sufficient high-frequency capability for ≤100 kHz digital switching; speed trade-off is intentional for low-power logic interface use cases.

Is thermal derating required for continuous operation at 150 °C ambient?

Yes-due to R_θJA = 625 °C/W, junction temperature rises 94 °C above ambient at full 200 mW dissipation. At T_A = +150 °C, maximum allowable power drops to ~85 mW to keep T_J ≤ +150 °C. Derating curves in DS30385 Rev. 10–2 confirm linear reduction from 200 mW at 25 °C to zero at 150 °C ambient on standard FR4 layout.