Diodes Incorporated DDTA123TE-7-F

Overview

DDTA123TE-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT523 package with built-in 2.2 kΩ base resistor (R1 only), V_CEO = −50 V, I_C = −100 mA peak, V_CE(sat) ≤ −0.3 V at I_C/I_B = −2.5 mA/−0.25 mA, and h_FE = 100–600. It enables compact, reliable digital switching in space-constrained consumer and industrial control circuits.

For engineers reviewing the DDTA123TE-7-F datasheet, DDTA123TE-7-F pinout, DDTA123TE-7-F application, or DDTA123TE-7-F equivalent, key selection criteria include its single-R1 biasing topology, guaranteed saturation performance at low drive current, SOT523 thermal resistance (833 °C/W), and automotive-grade manufacturing capability per IATF 16949.

Technical Context

This device integrates a PNP bipolar junction transistor with a monolithic 2.2 kΩ pull-up base resistor (R1), eliminating external bias components. It operates as a digital switch with defined turn-on threshold and predictable saturation behavior under pulsed or DC conditions.

Designed for logic-level interfacing, it supports −50 V collector-base and emitter-base breakdown ratings, −50 V V_CEO, and delivers f_T = 250 MHz at V_CE = −10 V and I_E = 5 mA - confirming suitability for high-speed switching up to low-MHz frequencies.

Key Specifications

Pinout & Package

SOT523 is a 3-pin ultra-small surface-mount plastic package (1.60 × 1.60 × 0.75 mm) with matte tin-plated leads, moisture sensitivity level 1, and UL 94V-0 flammability rating. Weight is 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 DDTA123J-7-F and NSV123T1T1G, DDTA123TE-7-F uniquely combines −50 V breakdown, SOT523 miniaturization, and 100–600 h_FE range - making it optimal for next-gen space-constrained, high-reliability digital switching where voltage headroom and gain stability are critical.

Availability

DDTA123TE-7-F is available at Aetrix Electronics and suitable for LED indicator driving, microcontroller GPIO expansion, and small-signal relay control requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for DDTA123TE-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-performance, high-reliability components for industrial, computing, consumer, and automotive markets.

This part belongs to the DDTA (R1-only series) pre-biased transistor family, designed specifically to simplify digital switching designs by integrating a single precision base resistor - targeting cost-sensitive, space-constrained applications needing rapid time-to-market.

FAQ

What is the function of the internal 2.2 kΩ resistor in DDTA123TE-7-F?

The internal 2.2 kΩ resistor (R1) connects between the base and emitter terminals, providing fixed base bias current when the base is driven low (relative to emitter). This eliminates the need for an external resistor and ensures predictable turn-on behavior with standard logic-level inputs, reducing design complexity and PCB area.

Can DDTA123TE-7-F be used in automotive applications?

Yes - DDTA123TE-7-F is manufactured in IATF 16949 certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101, Diodes Incorporated offers qualification support upon request. Its −50 V ratings, low leakage (<0.5 µA), and thermal stability make it suitable for non-safety-critical automotive signal switching.

How does the SOT523 package affect thermal performance?

The SOT523 package has a thermal resistance of 833 °C/W (junction-to-ambient, on 15 mm × 15 mm FR4 with 1 oz copper). At 150 mW max power dissipation, this yields ~125 °C junction rise above ambient - requiring derating above 25°C. Layout with thermal pads or adjacent copper pours improves real-world performance.

Is DDTA123TE-7-F pin-compatible with NPN pre-biased transistors like DDTC123TE-7-F?

No - DDTA123TE-7-F is PNP with emitter (pin 1), base (pin 2), collector (pin 3); DDTC123TE-7-F is NPN with collector (pin 1), base (pin 2), emitter (pin 3). Pin numbering matches SOT523 mechanical outline, but polarity and internal connections differ. Circuit redesign is required for substitution.