Diodes Incorporated ZUMT720TC

Overview

ZUMT720TC 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) power dissipation, -140 mV V_CE(sat) at -0.5 A/-50 mA, and 220 MHz f_T; used in DC-DC boost stages and low-voltage motor driver half-bridges.

For engineers reviewing the ZUMT720TC datasheet, ZUMT720TC pinout, ZUMT720TC application, or ZUMT720TC equivalent, key selection criteria include verified pulsed I_CM = -1 A, R_CE(sat) ≤ 240 mΩ at -750 mA, h_FE ≥ 40 at -0.75 A, thermal derating on FR4 substrates, and SOT-323 footprint compatibility with space-constrained power switches.

Technical Context

This PNP bipolar junction transistor operates in saturation-switching mode with low V_BE(sat) (-1.1 V max at -0.75 A/-100 mA) and fast switching (t_on = 75 ns, t_off = 315 ns under pulsed conditions). Its safe operating area supports 10 ms pulses up to -0.75 A at -2 V V_CE with IC/IB = 10.

The device exhibits stable h_FE across temperature: 300 min at -10 mA, 40 min at -0.75 A, and retains usable gain up to +150°C. Output capacitance C_obo is 8 pF at -10 V V_CB, supporting high-frequency switching in compact DC-DC topologies.

Key Specifications

Pinout & Package

SOT-323 (SC-70) plastic surface-mount package with gull-wing leads; 1.3 mm × 2.1 mm footprint, 0.95 mm height, 0.65 mm lead pitch. Thermal pad not present; PCB copper area recommended for heat spreading.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DXT720C-7 and MMBT720, ZUMT720TC offers optimal trade-off of ultra-compact SOT-323 size, verified 315 ns t_off, and sufficient 385 mW dissipation for intermittent boost/motor loads-making it preferred for space-constrained, medium-frequency power switching.

Availability

ZUMT720TC is available at Aetrix Electronics and suitable for DC-DC boost converters, brushed DC motor drivers, and LED current regulators requiring stable component supply with tight thermal and footprint constraints.

Supply support for ZUMT720TC 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 US.

ZUMT720TC belongs to the Super323™ family of PNP power transistors engineered for high-efficiency, space-constrained switching in battery-powered and automotive auxiliary systems.

FAQ

What is the maximum safe operating temperature for ZUMT720TC?

The ZUMT720TC has a specified junction temperature range of -55°C to +150°C. Derating begins at +25°C ambient: P_tot decreases by 3.2 mW/°C above 25°C on FR4 (10×8 mm). At +85°C ambient, maximum continuous power drops to ~195 mW. Thermal vias under the collector pad improve real-world performance.

Can ZUMT720TC replace a MOSFET in low-voltage switching?

ZUMT720TC can replace low-threshold N-channel MOSFETs only in low-frequency (<200 kHz), low-side PNP configurations where its -140 mV V_CE(sat) provides lower conduction loss than R_DS(on) × I_D of typical 0.5 Ω MOSFETs at 0.5 A. It lacks MOSFET gate isolation and requires base current drive, so gate-driven architectures remain incompatible.

Is ZUMT720TC suitable for linear regulation applications?

Yes-ZUMT720TC supports linear operation with verified h_FE ≥ 40 at -0.75 A and stable V_BE(on) (-890 to -1100 mV). Its 385 mW P_tot limits continuous linear use to ≤ 0.3 A at 1 V V_CE, making it viable for precision current sinks (e.g., LED bias) but not high-power LDO pass elements.

How does ZUMT720TC's SOT-323 package compare thermally to SOT-23?

ZUMT720TC in SOT-323 has higher thermal resistance (R_θJA ≈ 260°C/W on FR4 10×8 mm) versus SOT-23 variants (~220°C/W), due to smaller copper contact area. However, its 1.3×2.1 mm footprint saves 35% board space. For thermal-limited designs, adding two 0.3 mm thermal vias under the collector pad reduces R_θJA by ~15%.