Diodes Incorporated DDTA123TKA-7-F

Overview

DDTA123TKA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor with built-in 2.2 kΩ base bias resistor (R1 only), SC-59 package, −50 V V_CEO, −100 mA I_C, and h_FE of 100–600 at −1 mA/−5 V; used in compact logic-level switching and load control circuits.

For engineers reviewing the DDTA123TKA-7-F datasheet, DDTA123TKA-7-F pinout, DDTA123TKA-7-F application, or DDTA123TKA-7-F equivalent, this page delivers verified electrical specs, terminal roles, thermal derating behavior, R1 tolerance (±30%), and real-world use cases in level-shifting and discrete gate driving.

Technical Context

This device integrates a single PNP bipolar junction transistor with one external-base resistor (R1 = 2.2 kΩ ±30%) to simplify biasing in low-power digital interface circuits. It operates with V_CE(sat) ≤ −0.3 V at I_C/I_B = −2.5 mA/−0.25 mA and supports ambient temperatures from −55°C to +150°C.

The SC-59 package enables surface-mount assembly with 625°C/W junction-to-ambient thermal resistance on FR4 PCBs. Its epitaxial planar die construction ensures stable h_FE across temperature and consistent V_CEO breakdown at −50 V under rated conditions.

Key Specifications

Pinout & Package

Package: SC-59 - 3-pin surface-mount plastic package (JEDEC TO-236AB), 2.7–3.0 mm length, 1.5–1.7 mm width, 0.35–0.50 mm thickness; RoHS-compliant 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 DDTA123TKA-7-F, DDTA123J-7-F trades thermal performance for size reduction, while NSVDDTA123TXZT2G adds automotive qualification without altering bias or gain characteristics-enabling direct substitution where qualification is mandated.

Availability

DDTA123TKA-7-F is available at Aetrix Electronics and suitable for logic-level inversion, microcontroller GPIO interfacing, and level-shifting applications requiring stable component supply and RoHS-compliant packaging.

Supply support for DDTA123TKA-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, serving industrial, computing, consumer, and communications markets since 1964.

The DDTA (R1-only series) targets cost-sensitive, high-volume digital interface applications where simplified biasing and compact packaging reduce design complexity and board space.

FAQ

What is the function of the internal R1 resistor in DDTA123TKA-7-F?

The internal R1 resistor (2.2 kΩ ±30%) connects between base and collector, providing fixed current-limiting bias for predictable turn-on behavior. It eliminates external base resistors in simple switching circuits, reducing component count and improving layout efficiency without compromising saturation voltage or gain stability.

Can DDTA123TKA-7-F replace a standard PNP transistor like BC807?

Yes, but only when the circuit relies on base current supplied through an external resistor. DDTA123TKA-7-F integrates R1 between base and collector, so it cannot substitute for BC807 in emitter-follower or variable-bias configurations. Direct replacement is valid only in common-emitter switch designs with collector-referenced base drive.

What is the maximum allowable power dissipation at 85°C ambient?

At 85°C ambient, the maximum power dissipation is 125 mW. This follows the linear derating curve in Figure 1: 200 mW at 25°C, decreasing by 0.32 mW/°C above 25°C, resulting in 200 − (60 × 0.32) = 125 mW at 85°C, assuming proper FR4 pad layout per AP02001.

Is DDTA123TKA-7-F suitable for analog amplification?

No. Although it has f_T = 250 MHz and h_FE up to 600, its R1-only bias topology fixes the DC operating point and limits linearity. The datasheet positions it exclusively for switching applications; analog use would require external bias networks incompatible with the integrated resistor architecture.