Diodes Incorporated DDTA115ECA-7

Overview

DDTA115ECA-7 from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT23 package with integrated bias resistors R1 = R2 = 100 kΩ, −40 V input voltage rating, −20 mA output current capability, and 82× DC current gain at −5 V V_CE, used for level-shifting and digital switching in automotive control modules.

For engineers reviewing the DDTA115ECA-7 datasheet, DDTA115ECA-7 pinout, DDTA115ECA-7 application, or DDTA115ECA-7 equivalent, key selection criteria include input voltage range (−40 V), output saturation voltage (−0.3 V), resistor tolerance (±30%), AEC-Q101 qualification, and SOT23 thermal resistance (625 °C/W).

Technical Context

This device integrates two matched 100 kΩ bias resistors to configure a single-PNP transistor as a digitally controlled switch with fixed base biasing. It operates with input logic referenced to emitter (common-emitter configuration) and delivers low-saturation output under −1 mA to −20 mA load conditions.

The transistor exhibits 82× DC current gain at −5 V V_CE and −5 mA I_C, supports −55 °C to +150 °C operating temperature, and meets AEC-Q101 stress testing for automotive reliability without requiring external bias network design.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount plastic case, 0.008 g weight, UL 94V-0 rated molding compound, matte tin-plated leads, moisture sensitivity Level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA115EKA-7-F and NSV11500MT1G, DDTA115ECA-7 offers superior thermal performance (625 vs. 700 °C/W), full AEC-Q101 compliance, and −40 V input rating-making it the only option qualified for under-hood automotive switching where voltage transients and temperature extremes coexist.

Availability

DDTA115ECA-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input stages, and medical device status indicator circuits requiring stable component supply and long-term lifecycle assurance.

Supply support for DDTA115ECA-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The DDTA series belongs to Diodes' pre-biased transistor product line, engineered specifically for automotive and industrial digital interface applications where simplified biasing, high reliability, and AEC-Q101 compliance are mandatory.

FAQ

What is the maximum allowable input voltage for DDTA115ECA-7?

The absolute maximum input voltage (pin 1 to pin 2) is −40 V, verified per DS30333 Rev. 10–2 Section "Absolute Maximum Ratings." This rating applies under transient conditions and supports direct connection to −24 V systems with ISO 7637-2 pulse immunity. Continuous operation above −5 V requires current limiting via external series resistance to avoid exceeding 200 mW power dissipation.

Does DDTA115ECA-7 require external bias resistors?

No. DDTA115ECA-7 integrates two 100 kΩ ±30% silicon resistors (R1 = R2) internally between base and emitter, eliminating the need for external bias components. The device functions as a complete single-transistor switch with defined turn-on threshold (V_I(on) ≈ −1.9 V typ.) and guaranteed saturation behavior across temperature and process corners.

Is DDTA115ECA-7 suitable for high-temperature environments like engine compartments?

Yes. DDTA115ECA-7 is qualified to AEC-Q101 and specified for −55 °C to +150 °C operating temperature. Its SOT23 package achieves 625 °C/W junction-to-ambient thermal resistance on standard FR-4 PCBs, and derating curves in DS30333 confirm usable power dissipation up to +125 °C ambient when load current is reduced to ≤−10 mA.

How does the 100 kΩ resistor tolerance affect switching performance?

The ±30% R1/R2 tolerance directly impacts base current accuracy and thus V_I(on) consistency: worst-case variation shifts turn-on voltage by ±0.3 V around the typical −1.9 V value. However, the device maintains functional switching across this range due to its −40 V input rating and 82× gain margin, ensuring reliable operation in noisy automotive environments without additional hysteresis circuitry.