Diodes Incorporated ZUMT720TA

Overview

ZUMT720TA from Diodes Incorporated is a PNP silicon power switching transistor in SOT-323 package, rated for -40 V V_CEO, -0.75 A continuous I_C, 385 mW (FR4 10×8 mm) / 500 mW (FR4 25×25 mm) power dissipation, with V_CE(sat) as low as -65 mV at I_C = -0.1 A / I_B = -10 mA, used in DC-DC boost stages and brushed DC motor drivers.

For engineers reviewing the ZUMT720TA datasheet, ZUMT720TA pinout, ZUMT720TA application, or ZUMT720TA equivalent, key selection criteria include verified R_CE(sat) ≤ 240 mV at -750 mA, h_FE ≥ 300 at -10 mA, f_T = 220 MHz, safe operating area up to -1 A pulsed, and thermal performance on standard FR4 PCBs.

Technical Context

This PNP bipolar junction transistor operates in saturation-switching mode with low V_BE(sat) (-1000 to -1100 mV) and tightly specified V_CE(sat) across I_C = -0.1 A to -0.75 A at fixed I_B/I_C ratios. Its f_T of 220 MHz supports fast switching in sub-1 MHz DC-DC topologies.

The device features low C_obo (8 pF at V_CB = -10 V), enabling reduced switching losses, and exhibits stable h_FE down to -1 A (min 20 at I_C = -1 A), supporting robust current gain in high-pulse applications like motor commutation.

Key Specifications

Pinout & Package

Package: SOT-323 (Super323™), surface-mount, 3-terminal plastic package with standard lead frame geometry and JEDEC-compliant footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP power switching transistor applications.

Compared with ZUMT720TA, ZXTN25050DFH offers superior voltage headroom and lower conduction loss but requires tighter thermal management due to smaller thermal pad area, while MMDT3906-7-F lacks sufficient current capability for power switching roles.

Availability

ZUMT720TA is available at Aetrix Electronics and suitable for DC-DC boost converters, brushed DC motor drivers, and LED constant-current sinks requiring stable component supply across industrial and automotive production programs.

Supply support for ZUMT720TA 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 centers across Asia and manufacturing in China, Taiwan, and the U.S.

ZUMT720TA belongs to the ZUMT series of high-performance PNP power transistors engineered for efficiency-critical switching applications in portable power management and motor control subsystems.

FAQ

What is the maximum safe operating temperature for ZUMT720TA?

The ZUMT720TA has a specified junction temperature range of -55°C to +150°C. Its absolute maximum T_j is +150°C; sustained operation above this threshold risks permanent degradation. Derating begins at +25°C ambient per the P_tot curve-on a 10×8 mm FR4 board, power must be reduced by 3.85 mW/°C above 25°C.

Can ZUMT720TA replace an NPN transistor in a circuit?

No-ZUMT720TA is a PNP transistor and cannot directly substitute for an NPN without inverting the drive logic and power rail connections. It sources current from emitter to collector, whereas NPNs sink from collector to emitter. Swapping requires redesigning bias networks, polarity of control signals, and often the entire topology (e.g., high-side vs. low-side switch placement).

Is ZUMT720TA RoHS compliant and halogen-free?

Yes-ZUMT720TA meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The device carries the "HF" suffix in its full ordering code (ZUMT720TA-HF) to denote halogen-free construction, with bromine and chlorine content below 900 ppm each and total halogens <1500 ppm.

What is the recommended PCB pad layout for thermal performance?

For optimal thermal performance, use a minimum 25×25 mm copper pour connected to the collector pad (Pin 3) via ≥4 thermal vias (0.3 mm diameter, filled or plated). The SOT-323 footprint should follow Diodes Inc. standard land pattern DS-0001, with solder mask defined pads and no solder mask dams between pins to maximize heat spreading into inner layers.