Diodes Incorporated DDTA124GCA-7

Overview

DDTA124GCA-7 from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-23 package, featuring a built-in 22 kΩ bias resistor (R2 only), −50 V V_CEO, −100 mA I_C, h_FE = 56 (at I_C = −5 mA, V_CE = −5 V), and AEC-Q101 qualification for automotive signal switching applications.

For engineers reviewing the DDTA124GCA-7 datasheet, DDTA124GCA-7 pinout, DDTA124GCA-7 application, or DDTA124GCA-7 equivalent, key selection criteria include R2-only bias topology, guaranteed h_FE minimum, V_CEO/V_CBO rating, thermal derating on FR4, and RoHS-compliant green molding compound.

Technical Context

This device implements a single PNP bipolar junction transistor with an integrated base-emitter pull-up resistor (R2 = 22 kΩ ±30%), eliminating external bias components in digital switching circuits. It operates with V_EB(off) ≤ −4 V and delivers V_CE(sat) ≤ −0.3 V at I_C = −10 mA / I_B = −0.5 mA.

The transistor supports DC switching up to 150 °C junction temperature, exhibits f_T = 250 MHz (V_CE = −10 V, I_E = 5 mA), and maintains stable h_FE across I_C = 0.1–50 mA per typical curves - enabling predictable gain in logic-level interface and load control designs.

Key Specifications

Pinout & Package

Package: SOT-23 - surface-mount plastic case, 0.008 g weight, UL 94V-0 rated, moisture sensitivity level 1, lead-free matte tin plating over Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA124GCA-7, DDTA124ECA-7-F offers identical performance in all electrical and thermal parameters but differs only in top-side marking, while NSVDDTA124GCA-7 adds formal PPAP support and tighter process controls - making it suitable for safety-critical automotive subsystems where DDTA124GCA-7 meets general AEC-Q101 but not full ASIL compliance workflows.

Availability

DDTA124GCA-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input stages, and consumer appliance motor control requiring stable component supply, consistent AEC-Q101 qualification, and RoHS-compliant green packaging.

Supply support for DDTA124GCA-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, specializing in high-reliability components for automotive, industrial, and computing markets.

The DDTA (R2-only series) product line delivers pre-biased transistors optimized for space-constrained digital switching, reducing design complexity and improving time-to-market for logic-level interface applications.

FAQ

What is the function of the R2 resistor in DDTA124GCA-7?

The R2 resistor (22 kΩ) is an internal base-emitter pull-up resistor that provides automatic biasing for PNP transistor operation. It allows direct connection to logic outputs without external components, ensuring reliable turn-on when the base is pulled low and turn-off when left floating or driven high. Its ±30% tolerance is specified for design margining.

Can DDTA124GCA-7 replace a standard PNP transistor like BC807?

No - DDTA124GCA-7 is not a drop-in replacement for BC807 because it lacks a base connection independent of R2. Unlike BC807, its base terminal is internally tied to R2, limiting use to fixed-bias switching. For adjustable bias or linear amplification, a discrete transistor without integrated resistors is required.

What does the "GCA" suffix indicate in DDTA124GCA-7?

The "GCA" suffix denotes the specific R2 value (22 kΩ) and package variant within the DDTA R2-only series. Per Diodes' marking table, "P27" corresponds to DDTA124GCA, confirming the 22 kΩ resistor and SOT-23 package. It is not a generic code but a precise type identifier tied to electrical and mechanical specifications.

Is thermal derating required for DDTA124GCA-7 in real-world PCB layouts?

Yes - the 200 mW power rating applies only at T_A = 25 °C on FR4 with Diodes' recommended pad layout. Above 25 °C, power must be reduced by 1.6 mW/°C (based on R_θJA = 625 °C/W). At 85 °C ambient, maximum allowable power drops to 104 mW, limiting I_C to approximately −72 mA at V_CE(sat) = −0.3 V.