Diodes Incorporated DDTA122TE-7

Overview

DDTA122TE-7 from Diodes Incorporated is a PNP pre-biased digital transistor in SOT-523 package, featuring integrated 220 Ω and open-collector bias resistors (R1 = 220 Ω, R2 = open), −40 V V_CEO, −5 V V_EBO, and −100 mA I_C rating. It operates as a compact logic-level switch in low-power signal routing and level-shifting circuits for portable consumer electronics.

For engineers reviewing the DDTA122TE-7 datasheet, DDTA122TE-7 pinout, DDTA122TE-7 application, or DDTA122TE-7 equivalent, key selection criteria include verified V_EBO = −5 V, h_FE = 100–600 at I_C = −1 mA, R1 tolerance (±5%), absence of R2 pull-down, and SOT-523 thermal resistance (R_JA = 625 °C/W).

Technical Context

This device integrates a PNP bipolar junction transistor with monolithically embedded base biasing network-R1 connected between base and emitter, R2 omitted-enabling single-resistor drive from microcontroller GPIOs. Its −5 V V_EBO rating supports safe interface with 3.3 V/5 V logic families under reverse-bias conditions.

The SOT-523 package delivers 0.002 g mass and 625 °C/W junction-to-ambient thermal resistance when mounted per Diodes' recommended FR4 pad layout. Gain-bandwidth product f_T = 200 MHz confirms suitability for low-frequency switching (<10 MHz) rather than RF amplification.

Key Specifications

Pinout & Package

SOT-523 is a 3-pin ultra-small surface-mount plastic package (1.60 mm × 0.80 mm × 0.50 mm), rated UL 94V-0, with matte tin-plated terminals solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA122TE-7, DDTA114YU-7 trades input sensitivity for noise margin, while NSVD122PT1G adds AEC-Q101 compliance at higher cost-neither offers drop-in replacement due to R2 presence or qualification overhead.

Availability

DDTA122TE-7 is available at Aetrix Electronics and suitable for smartphone keypad interfaces, USB-C port detection logic, wearable sensor wake-up circuits, and IoT button debounce networks requiring stable component supply and consistent SOT-523 packaging.

Supply support for DDTA122TE-7 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 Malaysia.

The DDTA series targets space- and power-constrained digital switching applications, emphasizing integration of bias resistors, miniature packaging, and compatibility with modern low-voltage logic families.

FAQ

What is the function of the open R2 terminal in DDTA122TE-7?

The R2 terminal is internally left open, meaning no resistor connects base to collector. This configuration allows the device to operate as a true single-input switch-only R1 pulls the base toward emitter, enabling simpler drive circuitry and eliminating unintended feedback paths common in dual-resistor types.

Can DDTA122TE-7 replace a standard PNP BJT like BC807 in existing designs?

Yes, but only if the original design uses external base biasing and can accommodate the fixed 220 Ω R1 value. Unlike BC807, DDTA122TE-7 cannot be reconfigured for different bias points; its integrated R1 sets a specific input current threshold (~−20 mA at −5 V), which must match the driving source capability.

Does DDTA122TE-7 support 5 V logic input directly?

No-its absolute maximum V_EBO is −5 V, so applying +5 V to the emitter (relative to base) exceeds rating. It is designed for 3.3 V logic or lower. For 5 V systems, use a series current-limiting resistor or select a variant with higher V_EBO, such as DDTA143EU-7 (V_EBO = −15 V).

How does thermal performance compare between SOT-523 and SOT-23 packages for this device?

DDTA122TE-7 in SOT-523 has R_JA = 625 °C/W, significantly higher than typical SOT-23 values (~300–400 °C/W). This means it dissipates less power before reaching thermal limits-maximum continuous I_C must be derated above 25 °C ambient, especially in enclosed or non-ventilated assemblies.