Diodes Incorporated ZUMT718TC

Overview

ZUMT718TC from Diodes Incorporated is a 20V PNP power switching transistor in SOT323 package, rated for −1A continuous collector current, −200mV max V_CE(SAT) at −1A, and 500mW power dissipation; it serves as a compact high-current load switch in automotive lighting control and industrial I/O driver circuits.

For engineers reviewing the ZUMT718TC datasheet, ZUMT718TC pinout, ZUMT718TC application, or ZUMT718TC equivalent, key selection criteria include verified −20V V_CEO, confirmed R_CE(SAT) = 200mΩ at −1A, AEC-Q101 qualification, and complementary pairing with ZUMT618 NPN for push-pull output stages.

Technical Context

This PNP bipolar junction transistor operates in saturation-switching mode with low on-resistance behavior, enabled by optimized emitter-base doping and metallization to sustain −1A DC current while maintaining −250mV max V_CE(SAT) at −1A/−100mA drive. Its f_T of 210MHz supports fast switching up to ~100kHz PWM duty cycles.

Thermal design relies on SOT323's 250°C/W R_θJA (25mm × 25mm copper), enabling operation from −55°C to +150°C ambient; ESD robustness includes 4kV HBM and 400V MM ratings per JEDEC standards.

Key Specifications

Pinout & Package

Package: SOT323 - surface-mount plastic case, 0.006g weight, UL 94V-0 rated molding compound, matte tin-plated leads compliant with MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DXT718PSQ-13 and MMBT718LT1G, ZUMT718TC delivers optimal balance of low −250mV V_CE(SAT), AEC-Q101 compliance, and −1A continuous rating in SOT323-making it preferred for automotive and industrial 1A switching where thermal and reliability margins are critical.

Availability

ZUMT718TC is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC output stages, DC-DC synchronous rectification, and consumer appliance motor control requiring stable component supply across production lifecycles.

Supply support for ZUMT718TC 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 components for automotive, industrial, and computing markets.

ZUMT718TC belongs to Diodes' AEC-Q101-qualified power transistor product line, engineered for robust high-current switching in harsh-environment applications where thermal stability and ESD immunity are mandatory.

FAQ

What is the maximum allowable base current for ZUMT718TC?

The absolute maximum base current is −200mA per the Absolute Maximum Ratings table. However, for −1A collector current, the datasheet specifies −100mA base drive to achieve guaranteed −250mV V_CE(SAT); exceeding −100mA provides no significant saturation improvement and risks unnecessary power dissipation in the base circuit.

Can ZUMT718TC replace a mechanical relay in 24V industrial control?

Yes-ZUMT718TC supports 24V inductive loads when used with appropriate flyback diode and base current limiting. Its −20V V_CEO rating requires external clamping for 24V systems, but its 4kV HBM ESD rating and −55°C to +150°C operating range make it suitable for relay-replacement in PLC output modules where solid-state reliability and speed are prioritized.

Is ZUMT718TC pin-compatible with ZUMT618?

No-ZUMT718TC (PNP) and ZUMT618 (NPN) share the same SOT323 package and pinout order (Emitter-Base-Collector), but their polarity reversal means direct substitution would invert logic function. They are complementary-not pin-compatible-devices intended for matched pair designs like push-pull drivers or H-bridges.

Does ZUMT718TC require a heatsink in typical 1A operation?

No-under standard conditions (25mm × 25mm 1oz copper pad), its 250°C/W R_θJA results in ~62.5°C junction rise at 500mW dissipation (−1A × −250mV). With 25°C ambient, T_J = 87.5°C-well below the +150°C limit-so no heatsink is required for continuous 1A DC operation on properly designed PCBs.