Diodes Incorporated DDTA115EUA-7

Overview

DDTA115EUA-7 from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring integrated bias resistors R1 = R2 = 100 kΩ, −40 V V_IN rating, −20 mA I_O max output current, and DC current gain (G_L) of −82 at V_CE = −5 V, I_C = −5 mA. It functions as a digital switch or level translator in low-power logic interface circuits.

For engineers reviewing the DDTA115EUA-7 datasheet, DDTA115EUA-7 pinout, DDTA115EUA-7 application, or DDTA115EUA-7 equivalent, key selection criteria include input voltage range (−40 V), output current capability (−20 mA), built-in resistor ratio (R2/R1 = 0.8–1.2), thermal resistance (625 °C/W), and RoHS-compliant SOT-323 footprint compatibility with space-constrained PCB layouts.

Technical Context

This device integrates a PNP bipolar junction transistor with two matched on-die biasing resistors (R1 = R2 = 100 kΩ ±30%), enabling single-resistor-input switching without external base bias components. Its V_IN(on) of −1.9 V (typ) and V_O(on) of −0.1 V (typ) support TTL/CMOS-compatible logic-level control.

The transistor exhibits f_T = 250 MHz (typ) at V_CE = −10 V, I_E = 5 mA, confirming suitability for moderate-speed digital switching up to ~10 MHz edge rates. Thermal derating begins at 200 mW P_D (T_A = 25 °C), with R_θJA = 625 °C/W on FR4 board per AP02001 layout.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small surface-mount plastic case (2.00–2.20 mm × 1.15–1.35 mm × 0.25–0.40 mm height), UL 94V-0 rated, moisture sensitivity Level 1, lead-free matte tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA115EUA-7, DDTA115EKA-7 trades miniaturization for thermal headroom, while NSVD115EUA prioritizes input threshold stability over current drive-making each optimal for distinct thermal, size, or noise constraints.

Availability

DDTA115EUA-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and consumer IoT power sequencing requiring stable component supply and long-term obsolescence management.

Supply support for DDTA115EUA-7 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 automotive markets.

The DDTA series targets space-constrained digital interface applications, delivering pre-biased transistor functionality with guaranteed resistor matching and extended temperature operation (−55 to +150 °C).

FAQ

What is the maximum allowable input voltage for DDTA115EUA-7?

The absolute maximum input voltage (V_IN) is −40 V, defined as the voltage applied between pin 2 (base) and pin 1 (emitter). Exceeding this risks permanent damage to the internal bias resistors or transistor junction. This rating applies under steady-state conditions at T_A = 25 °C and is validated per DS30325 Rev. 8 test conditions.

Can DDTA115EUA-7 be used in high-frequency switching applications?

With a gain-bandwidth product (f_T) of 250 MHz, DDTA115EUA-7 supports digital switching up to ~10 MHz edge rates. However, its SOT-323 package parasitics and lack of specified switching time parameters limit use in RF or >50 MHz clock distribution. It is optimized for logic-level translation, not high-speed signal routing.

How does the R2/R1 ratio tolerance affect circuit performance?

The R2/R1 ratio is specified as 0.8–1.2, meaning base-emitter and base-collector resistors may differ by up to ±20%. This impacts saturation voltage consistency and input threshold variation across temperature and process corners. Designs requiring tight V_IN(on) matching should verify worst-case behavior using the −1.1 V V_I(off) min and −3 V V_I(on) max values.

Is DDTA115EUA-7 compatible with lead-free reflow profiles?

Yes - DDTA115EUA-7 uses matte tin plating over Alloy 42 leadframe and complies with J-STD-020C Level 1 moisture sensitivity. It supports standard Pb-free reflow profiles (peak 260 °C, 10–30 sec above 217 °C) without popcorn cracking or solder wetting issues when stored and handled per Diodes' packaging guidelines.