Diodes Incorporated DDTA143ZUA-7-F

Overview

DDTA143ZUA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring built-in bias resistors R1 = 4.7 kΩ and R2 = 47 kΩ (R1 ≠ R2), −50 V V_CEO, −100 mA I_C(max), and −0.3 V V_O(on) at −5 mA I_C/−0.25 mA I_B. It serves as a logic-level interface switch in low-power digital control circuits.

For engineers reviewing the DDTA143ZUA-7-F datasheet, DDTA143ZUA-7-F pinout, DDTA143ZUA-7-F application, or DDTA143ZUA-7-F equivalent, key selection criteria include input voltage thresholds (V_I(on) = −2.5 V), output saturation voltage, resistor ratio tolerance (±20%), DC current gain (G_L = −80), and thermal resistance (R_θJA = 625 °C/W).

Technical Context

This device integrates a PNP bipolar transistor with two non-matching on-chip base bias resistors (R1 = 4.7 kΩ, R2 = 47 kΩ), enabling direct TTL/CMOS-compatible switching without external bias components. Its R1/R2 configuration provides fixed current gain control and stable turn-on behavior across temperature.

The SOT-323 package supports surface-mount assembly on FR4 PCBs with recommended pad layout AP02001, delivering 200 mW power dissipation and operation from −55 °C to +150 °C. The −50 V V_CEO rating allows use in 24 V industrial bus interfaces and 3.3 V/5 V logic translation paths.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small plastic surface-mount package (2.20 × 1.35 × 0.90 mm), RoHS-compliant, 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 DDTA143ZCA-7-F, this SOT-323 variant saves board area but trades 100 mW power headroom and 195 °C/W thermal resistance; versus NSV143ZUT1G, it delivers 67% higher output current and −1.5 V deeper V_I(on) margin for noise-immune 3.3 V logic interfacing.

Availability

DDTA143ZUA-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C power delivery control, and IoT node battery monitoring requiring stable component supply and long-term manufacturability.

Supply support for DDTA143ZUA-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) UA family of pre-biased PNP transistors engineered for simplified digital logic interfacing and compact high-side switching in space-constrained consumer, computing, and industrial applications.

FAQ

What is the maximum operating temperature for DDTA143ZUA-7-F?

The device operates from −55 °C to +150 °C junction temperature. On a standard FR4 PCB with AP02001 pad layout, ambient temperature must be limited to ≤70 °C at full 100 mA load to stay within the 200 mW power dissipation limit, per the derating curve in Figure 1 of DS30326 Rev. 7-2.

Can DDTA143ZUA-7-F replace a standard PNP transistor like BC807?

No - it cannot serve as a direct replacement because it includes integrated base bias resistors (R1 = 4.7 kΩ, R2 = 47 kΩ). Using it in place of a bare PNP would cause incorrect biasing unless the external resistor network is removed. It is designed specifically for resistorless logic interface applications, not general-purpose amplification.

What does the "Z" in DDTA143ZUA-7-F signify?

The "Z" is Diodes Incorporated's type code for this specific R1/R2 combination (4.7 kΩ / 47 kΩ) within the DDTA143x series, as defined in Table 1 on page 1 of DS30326. It distinguishes this variant from DDTA143XUA (R1/R2 = 4.7 kΩ / 10 kΩ) and DDTA143FUA (R1/R2 = 4.7 kΩ / 22 kΩ).

Is DDTA143ZUA-7-F suitable for PWM-driven LED dimming?

Yes - its 250 MHz f_T and fast switching characteristics support PWM frequencies up to 100 kHz. However, due to its −100 mA I_C limit and −0.3 V V_O(on), it is best suited for low-current indicator LEDs (<50 mA); for higher-current strings, verify thermal rise using R_θJA = 625 °C/W and actual duty cycle.