Diodes Incorporated ZXT690BKQTC

Overview

ZXT690BKQTC from Diodes Incorporated is a 45V NPN high-gain medium-power transistor in TO252 (DPAK) package, rated for 3A continuous collector current and 6A peak pulse current, with DC current gain hFE ≥ 400 at 1A and RCE(SAT) = 77 mΩ. It serves as a robust switching element in automotive gate drivers and motor control circuits where high gain retention at elevated current and low saturation voltage are critical.

For engineers reviewing the ZXT690BKQTC datasheet, ZXT690BKQTC pinout, ZXT690BKQTC application, or ZXT690BKQTC equivalent, key selection criteria include its AEC-Q101 qualification, 45V BVCEO rating, hFE specification up to 6A, thermal resistance RθJC = 14.6°C/W, and TO252 package compatibility with high-power PCB layouts.

Technical Context

This NPN bipolar junction transistor is optimized for medium-power switching applications requiring stable gain at high collector currents (up to 6A), low VCE(SAT) under forced beta conditions (e.g., 230–350 mV at IC = 3A/IB = 150mA), and operation across –55°C to +150°C junction temperature range. Its fT = 150 MHz supports fast switching in gate drive and DC-DC converter topologies.

The device features an exposed collector pad for thermal conduction, enabling PD = 4.0 W on 50 mm × 50 mm 2 oz copper, with RθJA = 32°C/W under that condition. ESD ratings meet JEDEC HBM Class 3A (4 kV) and MM (400 V), supporting robust handling in automotive production environments.

Key Specifications

Pinout & Package

Package: TO252 (DPAK), surface-mount, with exposed collector pad for thermal and electrical connection. Molded green compound, UL 94V-0 rated, 0.34 g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXT690BKQTC, ZXT690BQTC offers identical electrical performance but omits automotive qualification, while MJD122G trades off voltage rating and saturation performance for broader distributor availability-making ZXT690BKQTC optimal for new AEC-Q101-compliant designs demanding 45V headroom and low-loss switching.

Availability

ZXT690BKQTC is available at Aetrix Electronics and suitable for automotive gate drivers, motor control modules, DC-DC converters, and siren drivers requiring stable component supply with full AEC-Q101 traceability and PPAP support.

Supply support for ZXT690BKQTC 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 solutions for automotive, industrial, and computing markets.

ZXT690BKQTC belongs to Diodes' AEC-Q101-qualified medium-power bipolar transistor product line, engineered specifically for automotive power switching applications requiring high gain at high current, low saturation voltage, and robust thermal performance in TO252 packaging.

FAQ

What is the maximum allowable junction temperature for ZXT690BKQTC?

The absolute maximum junction temperature is +150°C, with continuous operation supported from –55°C to +150°C. Derating begins above +25°C ambient: power dissipation drops linearly to 0 W at +150°C case temperature when mounted on 50 mm × 50 mm 2 oz copper, per the datasheet derating curve.

Does ZXT690BKQTC require a heatsink in typical automotive applications?

No dedicated heatsink is required if the PCB provides adequate thermal relief: the exposed collector pad must be soldered to ≥50 mm² of 2 oz copper (minimum) to achieve RθJA = 32°C/W. In confined spaces or high ambient temperatures (>85°C), increasing copper area or adding thermal vias improves margin.

How does ZXT690BKQTC's hFE behavior differ from standard transistors at high current?

ZXT690BKQTC maintains hFE ≥ 400 at IC = 1A and ≥ 60 at IC = 3A, whereas typical 3A transistors drop below hFE = 100 at 2A. This "high gain hold-up" allows smaller base drive circuits and tighter current regulation in motor and converter applications without gain collapse.

Can ZXT690BKQTC replace ZXT690B in existing designs?

Yes-ZXT690BKQTC is pin-compatible and electrically identical to ZXT690B, with identical TO252 footprint and electrical specs. The "KQ" suffix denotes AEC-Q101 qualification and automotive traceability; no layout or schematic changes are needed for drop-in replacement in new production.