Diodes Incorporated DDTA114WKA-7-F

Overview

DDTA114WKA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SC-59 package with integrated bias resistors R1 = 10 kΩ and R2 = 4.7 kΩ (R1 ≠ R2), V_CEO = −50 V, I_C(max) = −70 mA, and DC current gain (h_FE) ≥ 24 at −10 mA/−10 V. It functions as a digital switch or level translator in low-power logic interface circuits.

For engineers reviewing the DDTA114WKA-7-F datasheet, DDTA114WKA-7-F pinout, DDTA114WKA-7-F application, or DDTA114WKA-7-F equivalent, key selection criteria include input voltage thresholds (V_IN(on) = −1.3 V @ −2 mA), output saturation voltage (V_CE(sat) ≤ −0.3 V), resistor tolerance (±30% for R1), thermal resistance (625 °C/W), and RoHS-compliant green molding compound.

Technical Context

This device integrates two discrete bias resistors (R1 = 10 kΩ, R2 = 4.7 kΩ) directly into a PNP epitaxial planar transistor die to eliminate external base-resistor networks. Its R1 ≠ R2 configuration enables asymmetric switching behavior-optimized for reliable turn-on at low input currents while maintaining high off-state impedance.

The SC-59 surface-mount package supports automated assembly and delivers 200 mW power dissipation with junction-to-ambient thermal resistance of 625 °C/W on FR4 PCBs. It operates across −55 °C to +150 °C and meets J-STD-020C Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

Package: SC-59 - Surface-mount plastic package with three terminals (Emitter, Base, Collector), UL 94V-0 flammability rating, and lead-free matte tin plating over copper leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA114YKA-7-F, DDTA114WKA-7-F offers lower input threshold current (−2 mA vs. −1 mA) and tighter R2 tolerance impact on switching speed; versus DDTC114WKA-7-F, it provides complementary polarity for sink-driven loads in negative-rail architectures.

Availability

DDTA114WKA-7-F is available at Aetrix Electronics and suitable for industrial control input buffering, microcontroller GPIO expansion, and logic-level translation requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for DDTA114WKA-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.

The DDTA(R1≠R2) series targets cost-sensitive, space-constrained digital interface applications where integrated biasing improves reliability and reduces bill-of-materials complexity in consumer, computing, and industrial electronics.

FAQ

What is the maximum allowable input voltage for reliable switching?

The DDTA114WKA-7-F specifies V_IN(on) = −1.3 V at I_C = −2 mA and V_O = −0.3 V. Its absolute maximum input voltage is limited by the R1–R2 junction rating and remains within safe operation up to −10 V per datasheet test conditions. Exceeding −10 V risks exceeding the 200 mW power limit in the internal resistors.

Can this transistor replace a standard PNP BJT with external base resistors?

Yes-DDTA114WKA-7-F replaces a discrete PNP transistor plus two base bias resistors (10 kΩ and 4.7 kΩ). Its internal R1–R2 network matches typical TTL/CMOS drive strength, eliminating layout dependency and improving consistency across production units without recalculating resistor values.

Is thermal derating required for continuous operation at 85 °C ambient?

Yes-using the R_θJA of 625 °C/W, junction temperature rise at full 200 mW dissipation would be 125 °C above ambient. At 85 °C ambient, T_J reaches 210 °C-exceeding the 150 °C max rating. Derate linearly: maximum power drops to ~112 mW at 85 °C ambient to maintain T_J ≤ 150 °C.

Does the "KA" suffix indicate a specific temperature grade or packaging variant?

The "KA" suffix denotes the SC-59 package variant with green molding compound and lead-free finish, per Diodes Incorporated's standardized part numbering. It does not indicate extended temperature grade-the device is rated for −55 °C to +150 °C regardless of suffix, and "KA" appears across all R1≠R2 series parts in this package.