Diodes Incorporated DDTA144TCA-7-F

Overview

DDTA144TCA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring integrated bias resistors R1 = 47 kΩ and R2 = 22 kΩ (R1 ≠ R2), V_CEO = −50 V, I_C(max) = −30 mA, and DC current gain (h_FE) = −56 at V_CE = −10 V, I_C = −10 mA. It serves as a logic-level interface switch in low-power digital control circuits.

For engineers reviewing the DDTA144TCA-7-F datasheet, DDTA144TCA-7-F pinout, DDTA144TCA-7-F application, or DDTA144TCA-7-F equivalent, key selection criteria include input voltage thresholds (V_IN(on) = −2.5 V, V_IN(off) = −1.0 V), output saturation voltage (V_CE(sat) ≤ −0.3 V), resistor tolerance (±30% for R1, ±20% for R2/R1 ratio), and thermal resistance (R_θJA = 625 °C/W).

Technical Context

This device integrates a PNP bipolar junction transistor with two non-matching on-chip base bias resistors (R1 = 47 kΩ, R2 = 22 kΩ), enabling single-resistor input drive while maintaining defined turn-on/turn-off thresholds. Its complementary NPN counterpart is DDTC144TCA-7-F.

Designed for surface-mount logic interfacing, it operates across −55 °C to +150 °C, supports −30 mA continuous output current, and delivers 250 MHz f_T for moderate-speed switching applications such as level translation and load switching in portable electronics.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small plastic surface-mount package (2.00–2.20 mm × 1.15–1.35 mm × 0.25–0.40 mm height), RoHS-compliant, moisture sensitivity level 1, UL 94V-0 rated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA144TCA-7-F, DDTA144WUA-7-F offers identical functionality and parametric performance, while NSV14001MT1G trades voltage headroom for increased current capacity and improved thermal efficiency-making it suitable for higher-load, lower-voltage applications.

Availability

DDTA144TCA-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, and level translation interfaces requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for DDTA144TCA-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≠R2 Series) pre-biased transistor family, engineered specifically for simplified digital interface design in portable, industrial, and automotive electronics where board space and component count are constrained.

FAQ

What is the function of Pin 2 on DDTA144TCA-7-F?

Pin 2 is the internal base connection between R1 and R2 and is not brought out to the package terminals. Only Pins 1 (Emitter) and 3 (Collector) are externally accessible. This internal configuration eliminates the need for external base biasing and ensures fixed current gain behavior under defined operating conditions.

Can DDTA144TCA-7-F be used in linear amplifier applications?

No-this device is optimized for digital switching, not analog amplification. Its pre-biased structure, specified DC current gain (h_FE = −56 only at I_C = −10 mA), and lack of linearity characterization in the datasheet confirm its intended use as a saturated switch, not a linear gain stage.

Is DDTA144TCA-7-F pin-compatible with standard SOT-23 transistors?

No-it uses the smaller SOT-323 package (2.2 × 1.35 × 0.4 mm), which has different pad dimensions and pitch than SOT-23 (2.9 × 1.3 × 1.0 mm). Direct replacement requires PCB layout revision; mechanical compatibility must be verified using Diodes Inc.'s AP02001 recommended footprint.

What does the "TCA" suffix indicate in DDTA144TCA-7-F?

The "TCA" suffix denotes a specific type code within Diodes Inc.'s DDTA series, corresponding to R1 = 47 kΩ and R2 = 22 kΩ resistor values. It is functionally identical to the "WUA" variant (DDTA144WUA-7-F), with differences limited to internal marking and date-code formatting-not electrical or mechanical performance.