Diodes Incorporated DDTA115EKA-7-F

Overview

DDTA115EKA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SC-59 package with integrated bias resistors R1 = R2 = 100 kΩ, −40 V input voltage rating, −20 mA output current capability, and DC current gain (G_I) of 82 at V_CE = −5 V and I_O = −5 mA. It functions as an inverter-level switching device in low-power digital interface circuits.

For engineers reviewing the DDTA115EKA-7-F datasheet, DDTA115EKA-7-F pinout, DDTA115EKA-7-F application, or DDTA115EKA-7-F equivalent, key selection criteria include verified R1/R2 matching tolerance (±30%), guaranteed V_I(OFF) ≤ −0.5 V at −5 V supply, VO(on) ≤ −0.3 V under −5 mA load, and thermal resistance of 625 °C/W on FR4 board.

Technical Context

This device implements a monolithic PNP bipolar junction transistor with two matched on-die base biasing resistors (R1 = R2 = 100 kΩ), enabling single-resistor-input logic-level interfacing without external components. Its −40 V input voltage rating and −20 mA output current support robust level-shifting in 3.3 V/5 V mixed-voltage systems.

The transistor operates as a saturated switch with V_O(ON) ≤ −0.3 V at I_O/I_L = −5 mA/−0.25 mA, and exhibits G_I = 82 under standard test conditions (V_CE = −5 V, I_O = −5 mA), confirming stable current amplification in digital output stages.

Key Specifications

Pinout & Package

Package: SC-59 surface-mount plastic package (JEDEC TO-236AB), 3-pin, lead-free matte tin finish over copper leadframe, moisture sensitivity level 1 per J-STD-020C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA144EKA-7-F and DDTA124EKA-7-F, DDTA115EKA-7-F offers highest input impedance (100 kΩ), lowest quiescent input current (−0.15 mA), and highest DC gain (82), making it optimal for battery-powered or high-impedance interface applications.

Availability

DDTA115EKA-7-F 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 lifecycle support.

Supply support for DDTA115EKA-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 DDTA R1 = R2 series of pre-biased transistors, designed specifically to simplify digital logic interfacing and reduce passive component count in space-constrained, cost-sensitive applications.

FAQ

What is the maximum safe operating voltage for DDTA115EKA-7-F?

The absolute maximum collector-emitter supply voltage (V_CC) is −50 V, and the maximum input voltage (V_IN) is rated at −40 V. Operation beyond these values risks permanent breakdown. Derating is required above 25 °C ambient: power dissipation must be reduced by 1.6 mW per °C rise due to R_θJA = 625 °C/W.

Does DDTA115EKA-7-F require external biasing resistors?

No. It integrates matched R1 and R2 bias resistors (100 kΩ each) internally, forming a complete base bias network. This eliminates the need for external resistors in standard inverter or switch configurations, reducing PCB footprint and assembly steps.

How does the "Green" molding compound affect reliability?

Units manufactured from Date Code 0627 (week 27, 2006) onward use halogen-free, antimony-free "Green" molding compound compliant with IPC-1752 and JEDEC JS-709. This improves long-term moisture resistance and eliminates corrosive outgassing during reflow, enhancing field reliability in humid environments.

Can DDTA115EKA-7-F replace a standard PNP BJT in existing designs?

Yes, but only if the original design uses external base biasing and the new layout accommodates the SC-59 footprint. The internal R1/R2 network changes the input impedance and drive requirements-verify that the source logic can deliver ≥ −0.15 mA at −5 V and tolerate the −1.9 V typical V_I(ON) threshold.