Diodes Incorporated ZXT690BKTC

Overview

ZXT690BKTC 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, motor control stages, and DC-DC converter power stages where low saturation voltage and high gain stability up to 6A are required.

For engineers reviewing the ZXT690BKTC datasheet, ZXT690BKTC pinout, ZXT690BKTC application, or ZXT690BKTC equivalent, key selection criteria include its AEC-Q101 qualification, 45V BVCEO rating, 3A IC capability, TO252 thermal performance on 25mm×25mm 1oz copper, and verified hFE hold-up across 1–3A load range.

Technical Context

This NPN bipolar junction transistor operates with a minimum BVCEO of 45V and BVCBO of 60V, enabling use in 24V and 36V automotive and industrial power rails. Its hFE remains ≥150 at IC = 2A and ≥60 at IC = 3A, supporting stable linear and saturated switching across wide current ranges.

VCE(SAT) is specified at 240–360 mV @ IC = 1A/IB = 5mA and 230–350 mV @ IC = 3A/IB = 150mA, confirming low conduction loss under high-current drive conditions. Thermal resistance RθJC is 14.6°C/W, and RθJA reaches 36°C/W on 25mm×25mm 2oz copper - critical for thermally constrained PCB layouts.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXT690BKTC, ZXT690BKTCT offers identical performance with packaging variation for feeder compatibility, while MJD122G trades off voltage margin, saturation loss, and automotive qualification for lower unit cost - making it viable only outside AEC-Q101 environments.

Availability

ZXT690BKTC is available at Aetrix Electronics and suitable for automotive gate drivers, DC-DC converters, and motor control circuits requiring stable component supply, AEC-Q101 compliance, and consistent TO252 thermal performance.

Supply support for ZXT690BKTC 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 Malaysia.

ZXT690BKTC belongs to Diodes' high-reliability bipolar transistor product line, engineered specifically for automotive and industrial power switching applications demanding AEC-Q101 qualification, high gain stability, and low saturation voltage.

FAQ

What is the maximum allowable junction temperature for ZXT690BKTC?

The ZXT690BKTC has an operating junction temperature range of −55°C to +150°C. For reliable long-term operation, junction temperature should be limited to ≤145°C under steady-state conditions, based on thermal derating curves in DS31996 Rev. 5–2. This requires proper PCB copper area and airflow management per specified RθJA values.

Can ZXT690BKTC replace a MOSFET in low-side switching applications?

ZXT690BKTC is not a drop-in MOSFET replacement due to its bipolar drive requirement and lack of inherent body diode. However, it can serve as a cost-effective, high-current NPN switch where gate drive complexity and conduction loss trade-offs favor bipolar architecture - especially in 24V automotive loads with moderate switching frequency (<500 kHz).

Is the exposed collector pad electrically isolated from other terminals?

No - the exposed collector pad in the TO252 package is electrically connected to the collector terminal (Pin 1). It must be routed to the collector net on the PCB and cannot be used as a thermal pad without electrical isolation. Proper solder mask clearance and copper connection are mandatory per Diodes' recommended pad layout.

Does ZXT690BKTC support parallel operation for higher current handling?

Parallel operation is not recommended without external emitter resistors, as hFE variation between units causes current imbalance. The datasheet does not specify matched hFE bins or thermal coupling guidance for paralleling. For >3A applications, use a single higher-rated device or implement active current sharing with sense resistors and feedback control.