Diodes Incorporated DDTA125TE-7-F

Overview

DDTA125TE-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT523 package with built-in 200 kΩ bias resistor (R1 only), V_CEO = −50 V, I_C = −100 mA peak, h_FE = 100–600, and V_CE(sat) ≤ −0.3 V at I_C/I_B = −0.5 mA/−0.05 mA. It serves as a compact, lead-free switching element in low-power digital interface and level-shifting circuits.

For engineers reviewing the DDTA125TE-7-F datasheet, DDTA125TE-7-F pinout, DDTA125TE-7-F application, or DDTA125TE-7-F equivalent, key selection criteria include its single R1 bias configuration, −50 V breakdown ratings, SOT523 thermal resistance (833 °C/W), and suitability for space-constrained logic buffer and signal inversion tasks.

Technical Context

This device implements a monolithic PNP bipolar junction transistor with an integrated 200 kΩ base-emitter pull-up resistor (R1), eliminating external bias components. It operates under pulsed conditions (≤300 µs pulse width, ≤2% duty cycle) for saturation switching.

Its electrical behavior is defined by V_CEO = −50 V, V_CE(sat) ≤ −0.3 V at I_C/I_B = −0.5 mA/−0.05 mA, h_FE = 100–600 at I_C = −1 mA, and f_T = 250 MHz at V_CE = −10 V, enabling reliable low-current digital switching up to mid-MHz frequencies.

Key Specifications

Pinout & Package

Package: SOT523 - ultra-small surface-mount plastic package (1.60 mm × 1.60 mm × 0.75 mm), moisture sensitivity level 1, matte tin-plated leads, 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 DDTA125TE-7-F, DDTA124TE-7-F offers faster switching at higher base drive cost, while DDTA115TE-7-F reduces base current by 2× but sacrifices noise margin-selection depends on drive strength, speed, and standby current priorities.

Availability

DDTA125TE-7-F is available at Aetrix Electronics and suitable for logic level shifting, microcontroller GPIO expansion, and signal inversion applications requiring stable component supply and long-term design-in support.

Supply support for DDTA125TE-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-only series) pre-biased transistor family, designed specifically for reducing component count and board space in digital interface, logic buffering, and low-power switching applications.

FAQ

What is the function of the built-in 200 kΩ resistor in DDTA125TE-7-F?

The 200 kΩ resistor (R1) connects internally between base and emitter, providing automatic biasing for PNP transistor operation. It enables direct connection to logic-level inputs without external resistors, simplifying circuit design for inverter and switch functions while ensuring predictable turn-on characteristics at low base drive currents.

Can DDTA125TE-7-F be used in automotive applications?

DDTA125TE-7-F is not AEC-Q101 qualified per Diodes' documentation and is marked "Obsolete" in ordering information. For automotive use, Diodes recommends contacting their representative for PPAP-capable, IATF 16949-manufactured alternatives such as the AEC-Q101-qualified DDTA125W-7-F or equivalent qualified variants.

What is the maximum continuous collector current for DDTA125TE-7-F?

The datasheet specifies only a peak pulsed collector current (I_CM) of −100 mA under pulsed conditions (≤300 µs, ≤2% duty cycle). Continuous I_C must be derived from thermal limits: at T_A = +25 °C on a 15 mm × 15 mm FR4 board, P_D = 150 mW and V_CE(sat) ≤ −0.3 V imply I_C(continuous) ≤ 500 mA only if V_CE ≈ 0.3 V-but derating curves show usable continuous I_C is ~10–15 mA above +75 °C ambient.

How does the SOT523 package affect thermal performance?

The SOT523 package has a high thermal resistance of R_θJA = 833 °C/W on standard FR4, meaning even modest power dissipation causes significant junction temperature rise. At 150 mW, ΔT_J-A ≈ 125 °C - so operation above +25 °C ambient requires strict derating. Layout improvements (copper pour, thermal vias) can reduce R_θJA by ~30%, but continuous use above 50 mW demands careful thermal validation.