Diodes Incorporated DDTA122LE-7-F

Overview

DDTA122LE-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT-523 package, designed for low-power switching and signal inversion in compact DC-coupled circuits. It features integrated 22 kΩ and 10 kΩ bias resistors (R1/R2), −40 V V_CEO, −100 mA I_C, −0.3 V V_CE(sat) at −5 mA/−0.25 mA, and operates from −55 °C to +150 °C - used in portable battery management and LED driver enable logic.

For engineers reviewing the DDTA122LE-7-F datasheet, DDTA122LE-7-F pinout, DDTA122LE-7-F application, or DDTA122LE-7-F equivalent, key selection criteria include verified R1/R2 resistor values, guaranteed V_CE(sat) under specified I_B/I_C, thermal derating on FR4, and compatibility with 1.6 mm × 0.8 mm board space constraints.

Technical Context

This device integrates base-emitter and base-collector biasing resistors (R1 = 22 kΩ, R2 = 10 kΩ) to eliminate external components in simple digital interface applications. Its PNP topology enables active-low level shifting and high-side load control with single-supply operation.

The SOT-523 package supports high-density placement and exhibits 625 °C/W junction-to-ambient thermal resistance when mounted per Diodes' recommended pad layout. Gain-bandwidth product is 200 MHz, confirming suitability for low-frequency switching (<1 MHz) rather than RF amplification.

Key Specifications

Pinout & Package

Package: SOT-523 - ultra-small surface-mount plastic case (1.60 mm × 0.80 mm × 0.50 mm), lead-free matte tin finish, moisture sensitivity Level 1, weight ≈ 0.002 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA122JE-7-F, this part offers identical switching behavior but distinct traceability; versus NSVDDTA122LE-7F, it lacks AEC-Q101 certification but provides cost-effective performance for non-automotive applications requiring compact pre-biased PNP switching.

Availability

DDTA122LE-7-F is available at Aetrix Electronics and suitable for portable medical monitors, USB-C power delivery modules, and industrial sensor nodes requiring stable component supply and consistent SOT-523 tape-and-reel logistics.

Supply support for DDTA122LE-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.

This part belongs to the DDTA pre-biased transistor family, engineered for space-constrained digital interface and power control applications where simplified BOM and proven thermal reliability are critical.

FAQ

What is the exact R1 and R2 resistance value for DDTA122LE-7-F?

The DDTA122LE-7-F integrates R1 = 22 kΩ between base and emitter, and R2 = 10 kΩ between base and collector. These values are confirmed in the "Ordering Information" table on page 1 of DS30405 Rev. 5 and validated by electrical test conditions in the "Electrical Characteristics" section.

Can DDTA122LE-7-F replace a discrete PNP transistor plus two external resistors?

Yes - it replaces a standard PNP transistor (e.g., MMBT3906) plus 22 kΩ and 10 kΩ base bias resistors. The internal network matches typical TTL/CMOS drive requirements, reducing PCB area by ~1.2 mm² and eliminating resistor placement and solder joint risks.

Is the SOT-523 package compatible with standard reflow profiles?

Yes - the SOT-523 package uses matte tin lead finish and complies with J-STD-020C Level 1 moisture sensitivity. It supports standard Pb-free reflow profiles (peak 260 °C, 10 s max above 217 °C) when mounted per Diodes' recommended pad layout (AP02001).

Does DDTA122LE-7-F support bidirectional signal switching?

No - it is a unidirectional PNP transistor optimized for active-low switching from collector to emitter. Its structure does not support reverse bias operation or AC coupling; it must be used in DC-coupled, polarity-aware configurations per the published schematic.