Diodes Incorporated ZXTC6720MCTA

Overview

ZXTC6720MCTA from Diodes Incorporated is a dual NPN/PNP low-saturation transistor pair in a single DFN3020B-8 package, designed for high-efficiency power switching in compact DC–DC converters and motor control circuits. It integrates an 80V NPN (3.5A IC, 185mV VCE(sat) @1A) and a 70V PNP (2.5A IC, –220mV VCE(sat) @–1A), with matched thermal performance and AEC-Q101 qualification for automotive-grade reliability.

For engineers reviewing the ZXTC6720MCTA datasheet, ZXTC6720MCTA pinout, ZXTC6720MCTA application, or ZXTC6720MCTA equivalent, this device offers verified dual-polarity switching capability in a 3.0×2.0mm footprint with 0.8mm profile-critical for space-constrained portable and automotive power stages where low R_SAT and thermal resistance (R_θJA = 83.3°C/W, one die) directly impact efficiency and board-level thermal management.

Technical Context

This dual-transistor combination operates as a complementary switch pair: the NPN handles high-side or common-emitter switching up to 80V with h_FE ≥200 at 10mA and f_T = 100MHz, while the PNP supports low-side or emitter-follower configurations up to –70V with h_FE ≥200 at –10mA and f_T = 150MHz. Both transistors are characterized under pulsed conditions (≤300µs, ≤2% duty cycle) for saturation and gain stability.

Thermal design is enabled by split exposed collector pads on the DFN3020B-8 package, allowing independent PCB copper pours per die. R_θJL = 17.1°C/W (junction-to-lead) and R_θJA values vary by board area and copper weight-e.g., 83.3°C/W on 28mm×28mm 2oz Cu (one active die)-supporting precise derating for continuous operation up to +150°C junction temperature.

Key Specifications

Pinout & Package

DFN3020B-8 package with exposed collector pads (C1, C2) on underside for thermal enhancement; top-side marking "DE4" denotes pin 1. Pin 1 is NPN collector (C1), Pin 2 is NPN emitter (E1), Pin 3 is NPN base (B1), Pin 4 is PNP collector (C2), Pin 5 is PNP emitter (E2), Pin 6 is PNP base (B2), Pins 7–8 are internal thermal pads connected to respective collectors.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar complementary bipolar transistor applications.

Compared with ZXTD6718MC, ZXTC6720MCTA trades voltage headroom and current rating for 33% smaller footprint and lower thermal resistance per mm²; versus DMT6009LPS, it delivers faster switching and lower gate drive power but requires precise base current control.

Availability

ZXTC6720MCTA is available at Aetrix Electronics and suitable for DC–DC converters, charging circuits, and motor control applications requiring stable component supply, AEC-Q101 compliance, and ultra-compact power switching.

Supply support for ZXTC6720MCTA 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 power management, signal integrity, and protection devices.

The ZXTC series targets high-efficiency, space-constrained power switching applications-specifically engineered to replace legacy SOT26/SOT363 transistors with improved thermal performance and automotive qualification.

FAQ

What is the maximum continuous power dissipation for ZXTC6720MCTA in a typical PCB layout?

The maximum continuous power dissipation is 1.5W for the NPN transistor and 1.13W for the PNP transistor when mounted on a 28mm×28mm FR4 PCB with 2oz copper and one active die. This assumes still-air conditions and steady-state operation, with thermal derating beginning at 83.3°C/W above 25°C ambient. Dual-die operation reduces per-die limits due to mutual heating.

Can ZXTC6720MCTA be used in linear regulator applications?

No-this device is optimized for switching operation, not linear regulation. Its low V_CE(sat) and high h_FE are specified under pulsed conditions (≤300µs, ≤2% duty cycle). Continuous linear operation would exceed safe operating area limits, especially at V_CE >10V and I_C >0.5A, risking thermal runaway due to β degradation at elevated junction temperatures.

How does the DFN3020B-8 package improve thermal performance over SOT26?

The DFN3020B-8 reduces R_θJA by 40% versus SOT26 due to dual exposed collector pads that provide direct thermal paths to PCB copper, whereas SOT26 relies on leadframe conduction. Measured R_θJA is 83.3°C/W (vs. ~140°C/W for SOT26) on identical 28mm×28mm 2oz Cu boards, enabling 1.5W dissipation without heatsinking-critical for sealed portable enclosures.

Is ZXTC6720MCTA pin-compatible with other Diodes DFN dual-transistor packages?

No-it uses a proprietary 8-pin DFN3020B-8 layout (3.0×2.0mm) with non-standard pin assignment (C1,E1,B1,C2,E2,B2,EP,EP). It is not pin-compatible with ZXTD6718MC (DFN3030D-8, 3.0×3.0mm) or ZXMD63C03 (DFN2020-6, 2.0×2.0mm). Layout must follow the exact pad dimensions and thermal pad placement specified in DS31929 Rev. 3–2, page 8.