Diodes Incorporated DDTA125TCA-7-F

Overview

DDTA125TCA-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT23 package with single built-in bias resistor R1 = 200 kΩ, h_FE = 100–600 at I_C = −1 mA, V_CE = −5 V, V_CEO = −50 V, and P_D = 200 mW - used for discrete logic-level switching and level translation in space-constrained consumer and industrial control circuits.

For engineers reviewing the DDTA125TCA-7-F datasheet, DDTA125TCA-7-F pinout, DDTA125TCA-7-F application, or DDTA125TCA-7-F equivalent, key selection criteria include verified R1 tolerance (±30%), guaranteed V_CE(sat) ≤ −0.3 V at I_C/I_B = −0.5 mA/−0.05 mA, AEC-Q101 eligibility path, SOT23 thermal resistance (625 °C/W), and automotive-grade manufacturing traceability.

Technical Context

This device implements a monolithic PNP bipolar junction transistor with an integrated 200 kΩ base-emitter pull-up resistor (R1 only), eliminating external bias components in high-impedance drive applications. It operates within −55 °C to +150 °C and supports DC switching up to 250 MHz f_T under specified conditions.

Designed for simplified digital interface buffering, it delivers predictable saturation behavior with I_CBO ≤ −0.5 μA at V_CB = −50 V and BVEBO = −5 V, enabling reliable operation in low-power microcontroller GPIO interfacing and LED driver enable stages where base current sourcing must be minimized.

Key Specifications

Pinout & Package

Package: SOT23 - Surface-mount plastic package with matte tin-plated leads, moisture sensitivity level 1, UL 94V-0 rating, and 0.008 g mass. Compatible with standard reflow profiles per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA125TCA-7-F, the KAA variant trades full temperature range for enhanced lot-level reliability data, while the NSV part reduces voltage margin and gain floor - making the original optimal for wide-temp, high-reliability 24 V industrial nodes.

Availability

DDTA125TCA-7-F is available at Aetrix Electronics and suitable for industrial sensor interface, microcontroller GPIO buffering, LED status indication, and automotive door module input applications requiring stable component supply despite its obsolete status - inventory is held under controlled allocation for legacy system support.

Supply support for DDTA125TCA-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) CA family - engineered specifically for cost-sensitive, space-constrained digital switching applications where integration of a single base bias resistor improves assembly yield and reduces PCB real estate versus discrete transistor-resistor combinations.

FAQ

Is DDTA125TCA-7-F still in active production?

No - Diodes Incorporated lists DDTA125TCA-7-F as Obsolete in its official ordering information table. However, Aetrix Electronics maintains allocated legacy stock with full traceability and documentation for continued support of existing designs through end-of-life transitions.

What is the exact value and tolerance of the internal resistor R1?

The internal R1 resistor is 200 kΩ with a tolerance of ±30%, as confirmed in the "Part Number R1 (NOM)" table and Electrical Characteristics section of DS30335 Rev. 8-2. This value is laser-trimmed during wafer sort and verified per lot.

Can DDTA125TCA-7-F replace DDTA124TCA-7-F in a circuit?

No - DDTA124TCA-7-F has R1 = 22 kΩ, while DDTA125TCA-7-F uses R1 = 200 kΩ. Substituting them alters base current by ~9×, causing significant shift in I_C and V_CE(sat); redesign of drive conditions and load verification is required before interchange.

Does this part meet AEC-Q101 stress testing requirements?

DDTA125TCA-7-F is manufactured in IATF 16949-certified facilities and supports PPAP documentation, but Diodes does not list it as AEC-Q101-qualified in DS30335. For automotive use, the DDTA125TKA-7-F variant is recommended as it undergoes extended temperature screening aligned with AEC-Q101 test plans.