Diodes Incorporated ZXTN2010A

Overview

ZXTN2010A from Diodes Incorporated (formerly Zetex Semiconductors) is a 60V NPN medium-power bipolar junction transistor in E-line (SOT-223) package, designed for low-loss switching in DC-DC converters and power drive circuits. It delivers 4.5A continuous collector current, 15A peak pulse current, and ultra-low V_CE(SAT) of 45mV at I_C=5A/I_B=200mA - enabling high-efficiency motor and solenoid control in industrial power modules.

For engineers reviewing the ZXTN2010A datasheet, ZXTN2010A pinout, ZXTN2010A application, or ZXTN2010A equivalent, key selection criteria include verified saturation voltage at high current, thermal resistance under PCB-mount conditions, safe operating area at 150°C junction temperature, and compatibility with 7V E-B breakdown-limited base drive circuits.

Technical Context

This NPN BJT operates in linear and saturated switching modes with guaranteed BV_CEO = 60V and BVCBO = 150V, supporting robust operation in 48V bus systems. Its h_FE ranges from 100–300 across 10mA–10A collector currents, enabling stable current gain in both small-signal biasing and high-current switching stages.

Thermal design is constrained by R_JA = 125°C/W (PCB-mounted) and 175°C/W (socketed), requiring copper pour and thermal vias for sustained 4.5A operation. Switching performance is characterized by t_ON = 42ns and t_OFF = 760ns at I_C = 1A, suitable for PWM frequencies up to ~1MHz in DC-DC topologies.

Key Specifications

Pinout & Package

E-line (SOT-223) package: 4-pin outline with emitter-tab (pin 1), base (pin 2), collector (pin 3), and emitter (pin 4). Tab is electrically connected to emitter and serves as primary thermal path.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-power switching applications.

Compared with MJD127G, ZXTN2010A reduces conduction loss by >95% at 5A, enabling smaller heatsinks; versus ZXTN25040DFH, it offers single-device simplicity and lower R_JA (125 vs. 150°C/W), favoring high-reliability single-load applications.

Availability

ZXTN2010A is available at Aetrix Electronics and suitable for emergency lighting systems, DC fan motor drives, solenoid actuator interfaces, and DC-DC converter power stages requiring stable component supply across industrial production cycles.

Supply support for ZXTN2010A 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 acquired Zetex Semiconductors in 2008, integrating its high-performance analog and power transistor portfolio into a global supply chain serving industrial, automotive, and computing markets.

ZXTN2010A belongs to Zetex's E-line medium-power BJT family, engineered specifically for high-efficiency, thermally constrained switching in DC-DC conversion and electro-mechanical actuation circuits.

FAQ

What is the maximum allowable base current for reliable operation?

The datasheet specifies I_B = 200mA for saturation at I_C = 5A. Exceeding this risks localized heating at the base-emitter junction. For continuous 4.5A operation, maintain I_B ≤ 200mA with 10–20% derating for ambient temperatures above 70°C. Base resistor must limit peak current during PWM edges to avoid transient overshoot.

Can ZXTN2010A replace a MOSFET in low-side switching applications?

Yes - but only where gate drive simplicity outweighs efficiency trade-offs. Unlike MOSFETs, it requires sustained base current (200mA) and exhibits 45mV V_CE(SAT) vs. typical MOSFET R_DS(on) × I_D losses. Use when 3.3V/5V microcontroller GPIO can directly drive the base without level-shifting, and thermal budget permits 0.23W conduction loss at 5A.

Is the emitter tab electrically isolated from other pins?

No - the metal tab is internally bonded to the emitter (pin 1 and pin 4). It must be electrically connected to the emitter net on the PCB. Insulating the tab violates the device's thermal and electrical design, causing overheating and potential failure. Use conductive thermal paste only if mounting to a heatsink tied to emitter potential.

How does R_JA change with PCB copper area?

R_JA = 125°C/W is measured on 25×25mm 1oz copper. Doubling copper area to 50×50mm reduces R_JA by ~30% (to ~88°C/W); adding 4 thermal vias under the tab further lowers it to ~75°C/W. These improvements enable full 4.5A current at T_A = 70°C without forced air cooling.