Diodes Incorporated DDTA143FKA-7-F

Overview

DDTA143FKA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SC-59 package with R1 = 4.7 kΩ, R2 = 22 kΩ, V_CEO = −50 V, I_C(max) = −100 mA, and DC current gain (h_FE) = 68 at −10 mA/−10 V. It functions as an integrated digital switch for logic-level interface and load control in space-constrained PCBs.

For engineers reviewing the DDTA143FKA-7-F datasheet, DDTA143FKA-7-F pinout, DDTA143FKA-7-F application, or DDTA143FKA-7-F equivalent, key selection criteria include input voltage thresholds (V_IN(on) = −2.5 V), output saturation voltage (V_CE(sat) ≤ −0.3 V), bias resistor tolerance (±30%), resistance ratio stability (±20%), and thermal resistance (625 °C/W).

Technical Context

This device integrates a PNP bipolar junction transistor with two non-matching on-chip base bias resistors (R1 ≠ R2), enabling direct TTL/CMOS-compatible switching without external bias components. Its internal configuration supports inverter operation with defined input logic thresholds and guaranteed turn-on/off behavior across −55 °C to +150 °C.

The SC-59 surface-mount package provides low thermal resistance (625 °C/W) when mounted per Diodes' recommended FR4 pad layout, and its "Green" molding compound meets UL 94V-0 flammability rating and RoHS compliance requirements without halogenated flame retardants.

Key Specifications

Pinout & Package

Package: SC-59 - Surface-mount plastic package with three terminals, 0.008 g mass, UL 94V-0 rated, 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 DDTA143ZKA-7-F, DDTA143FKA-7-F offers lower input threshold (−2.5 V vs −5.0 V), enabling direct drive from 3.3 V logic; versus DDTC143FKA-7-F, it provides high-side sourcing capability essential for common-anode configurations and rail-enable functions.

Availability

DDTA143FKA-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, level translation interfaces, and power sequencing control requiring stable component supply and long-term manufacturability.

Supply support for DDTA143FKA-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) KA family of pre-biased transistors, engineered specifically for reducing component count and improving reliability in digital interface and load-switching applications across consumer, industrial, and automotive electronics.

FAQ

What is the maximum operating temperature for DDTA143FKA-7-F?

The DDTA143FKA-7-F is rated for junction and storage temperatures from −55 °C to +150 °C. Its thermal resistance (R_θJA) is 625 °C/W when mounted on FR4 with Diodes' recommended pad layout, meaning derating begins above 25 °C ambient to maintain safe junction temperature within limits.

Can DDTA143FKA-7-F replace a standard PNP transistor with external base resistors?

Yes - it replaces a discrete PNP transistor plus two base bias resistors (R1 and R2). The internal 4.7 kΩ and 22 kΩ resistors are trimmed to ±30% and ±20% tolerance respectively, delivering predictable switching behavior without layout overhead or resistor placement errors.

Is DDTA143FKA-7-F compatible with lead-free reflow soldering processes?

Yes - it features matte tin-plated copper leadframe and complies with J-STD-020C Level 1 moisture sensitivity. Its "Green" molding compound is halogen-free and rated UL 94V-0, supporting standard Pb-free reflow profiles up to 260 °C peak temperature.

How does the R1 ≠ R2 architecture improve performance over symmetric bias networks?

The asymmetric R1/R2 ratio (4.7 kΩ / 22 kΩ) sets distinct input voltage thresholds for turn-on (−2.5 V) and turn-off (−0.3 V), providing built-in hysteresis and noise immunity. This avoids false triggering in noisy industrial environments where symmetric networks would exhibit ambiguous switching near logic thresholds.