Diodes Incorporated DDTA123YKA-7-F

Overview

DDTA123YKA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SC-59 package with R1 = 2.2 kΩ and R2 = 10 kΩ, designed for digital switching and level translation in low-power logic interfaces. It delivers V_I(ON) = −3.0 V at I_O = −20 mA, V_O(ON) ≤ −0.3 V, DC current gain (G_L) of −33, and f_T = 250 MHz, supporting reliable on/off control in portable microcontroller I/O drivers.

For engineers reviewing the DDTA123YKA-7-F datasheet, DDTA123YKA-7-F pinout, DDTA123YKA-7-F application, or DDTA123YKA-7-F equivalent, key selection criteria include input voltage thresholds for TTL/CMOS compatibility, guaranteed saturation voltage under defined I_C/I_B ratios, resistor tolerance (±30% for R1), and thermal derating above 25°C ambient.

Technical Context

This device integrates a PNP bipolar junction transistor with two discrete on-die biasing resistors (R1 ≠ R2), eliminating external base-resistor networks. Its internal topology enables direct connection to logic outputs without pull-up/pull-down components, reducing PCB footprint and component count in signal inversion and load-switching circuits.

The transistor operates with V_CC = −50 V maximum, supports I_O = −100 mA continuous output current, and maintains stable G_L across −55°C to +150°C operating temperature range. Input voltage thresholds are specified at multiple test conditions (e.g., V_I(ON) = −3.0 V @ V_O = −0.3 V, I_O = −20 mA), ensuring predictable turn-on behavior in mixed-voltage systems.

Key Specifications

Pinout & Package

Package: SC-59 (SOT-23 variant), surface-mount, lead-free, RoHS-compliant, 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 DDTA123YKA-7-F, DDTA123JKA-7-F offers earlier turn-on but lower output drive, while DDTC123YKA-7-F provides functional symmetry in NPN topology-choice depends on circuit topology (high-side vs. low-side), drive strength, and logic polarity requirements.

Availability

DDTA123YKA-7-F is available at Aetrix Electronics and suitable for microcontroller I/O interfacing, logic level translation, and low-power load switching requiring stable component supply and long-term production continuity.

Supply support for DDTA123YKA-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, specializing in high-reliability, energy-efficient components for industrial, computing, and consumer markets.

This part belongs to the DDTA R1≠R2 series of pre-biased transistors, engineered specifically for simplified digital switching in space-constrained, cost-sensitive applications where resistor network integration reduces design complexity.

FAQ

What is the maximum continuous collector current for DDTA123YKA-7-F?

The maximum continuous output current (I_O) is −100 mA at T_A = 25°C, with thermal derating applied above ambient temperature per the 625 °C/W R_θJA rating. At 75°C ambient, usable current drops to approximately −60 mA to maintain safe junction temperature.

Can DDTA123YKA-7-F be used in linear amplifier applications?

No-it is optimized for digital switching, not analog amplification. Its R1/R2 bias network fixes the operating point for saturation/cutoff, and its G_L specification is only guaranteed under switching test conditions (V_CE = −10 V, I_C = −10 mA). Linear gain and linearity are not characterized or warranted.

Is the SC-59 package compatible with standard SOT-23 footprints?

Yes-SC-59 is mechanically identical to JEDEC TO-236AB (commonly called SOT-23), sharing the same pad layout, dimensions, and reflow profile. Standard SOT-23 pick-and-place equipment and stencil designs can be used without modification.

What does the "-7-F" suffix indicate in the part number?

The "-7-F" denotes tape-and-reel packaging: "-7" specifies 3000 units per reel, and "-F" indicates lead-free, RoHS-compliant finish (matte tin over copper leadframe). This matches Diodes Incorporated's standard ordering code for SC-59 devices.