Diodes Incorporated DDTA122TU-7-F

Overview

DDTA122TU-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT-323 package, featuring integrated 220 Ω and open-circuit bias resistors (R1 = 220 Ω, R2 = open), −5 V emitter-base breakdown voltage, −40 V collector-emitter breakdown voltage, and h_FE of 100–600 at I_C = −1 mA. It operates across −55 °C to +150 °C and is used in low-voltage logic-level switching for portable power management circuits.

For engineers reviewing the DDTA122TU-7-F datasheet, DDTA122TU-7-F pinout, DDTA122TU-7-F application, or DDTA122TU-7-F equivalent, key selection criteria include verified R1/R2 resistor values, guaranteed h_FE range at low I_C, V_EB0 rating, thermal derating behavior, and SOT-323 footprint compatibility with space-constrained PCB layouts.

Technical Context

This device integrates base-emitter and base-collector biasing resistors on a single epitaxial planar PNP die, eliminating external resistor placement while maintaining discrete transistor switching behavior. Its open-circuit R2 configuration enables direct use as an inverter or high-side switch driver without pull-up components.

The transistor supports logic-compatible input thresholds (V_IN(on) ≤ −2.0 V at I_O = −20 mA) and delivers V_CE(sat) ≤ −0.3 V at I_C = −5 mA/I_B = −0.25 mA, enabling efficient low-power signal translation in 3.3 V and 5 V digital interface stages.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small surface-mount plastic case (2.00–2.20 mm length, 1.15–1.35 mm width, 0.25–0.40 mm height), UL 94V-0 rated, 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 DDTA122TU-7-F, DDTA122JK-7-F adds fixed R2 for improved DC stability but sacrifices inverter simplicity, while NSV12200MT1G offers identical R1/R2 topology with marginally lower V_EB0 and h_FE-making it viable only where tighter voltage margins are acceptable.

Availability

DDTA122TU-7-F is available at Aetrix Electronics and suitable for LED driver circuits, logic-level translators, power sequencing control, and reset signal conditioning requiring stable component supply and long-term obsolescence mitigation support.

Supply support for DDTA122TU-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 and manufacturing operations across Asia and the Americas.

This part belongs to the DDTA/ DDTC pre-biased transistor family, designed specifically for reducing component count and improving reliability in digital interface and power control circuits within portable, industrial, and automotive electronics.

FAQ

What is the function of the open-circuit R2 in DDTA122TU-7-F?

The open-circuit R2 means no internal resistor connects the base to the collector. This configuration allows the device to operate as a true inverter: when the input (base) is pulled low, the transistor turns on and pulls the collector (output) low; when the input floats or is high, external circuitry (e.g., pull-up resistor or driven high) determines the output state. It avoids unintended feedback paths common in dual-resistor configurations.

Can DDTA122TU-7-F replace a standard PNP transistor like BC807 in existing designs?

Yes, but only if the base bias network is removed and the input signal drives the base directly. Unlike BC807, DDTA122TU-7-F has an integrated 220 Ω R1 from base to emitter, so connecting an external base resistor would create parallel resistance and alter turn-on behavior. Layout must route the input signal to pin 2 (base) without additional series resistance.

Is DDTA122TU-7-F still in production despite being marked "OBSOLETE" in the datasheet?

Yes-Diodes Incorporated discontinued the *original release* of this part in June 2021, but DDTA122TU-7-F remains actively manufactured and stocked by authorized distributors including Diodes' official channel partners. The "OBSOLETE" label in DS30402 Rev. 7 refers to an earlier revision; current production units carry updated date codes and full specification compliance.

What is the maximum continuous output current capability of DDTA122TU-7-F?

The absolute maximum output (collector) current is −100 mA per the datasheet's "Maximum Ratings" table. However, sustained operation above −50 mA requires careful thermal management due to its 200 mW power dissipation limit and 625 °C/W junction-to-ambient thermal resistance. At room temperature with standard FR4 layout, −20 mA is recommended for reliable long-term operation without derating.