Diodes Incorporated ZXT849KTC

Overview

ZXT849KTC from Diodes Incorporated is a 30V NPN low-saturation transistor in TO252 (DPAK) package, designed for high-current switching in power conversion and motor control circuits. It delivers 7A continuous collector current, 20A peak pulse current, 33mΩ R_CE(SAT), 100–200 h_FE up to 7A, and AEC-Q101 qualification for automotive reliability.

For engineers reviewing the ZXT849KTC datasheet, ZXT849KTC pinout, ZXT849KTC application, or ZXT849KTC equivalent, key selection criteria include V_CE(SAT) at 7A/350mA drive, thermal derating on 25mm×25mm 1oz copper, safe operating area limits, and RoHS/halogen-free compliance for automotive-grade production.

Technical Context

This NPN bipolar junction transistor operates as a high-efficiency, low-V_CE(SAT) switch in DC-DC converters and motor drivers. Its BVCER = 80V and BVCEO = 30V define its blocking capability under clamped and open-base conditions, while h_FE ≥ 100 at IC = 7A ensures stable base drive design across temperature.

The device uses a TO252 (DPAK) thermally enhanced package with exposed collector pad, enabling R_θJA = 59°C/W on minimal PCB copper and supporting >2W steady-state dissipation. Its f_T = 100MHz and t_OFF = 630ns support medium-speed switching in synchronous rectifier and PWM control stages.

Key Specifications

Pinout & Package

Package: TO252 (DPAK), surface-mount, thermally enhanced with exposed collector pad. Molded green compound, UL 94V-0 rated, 0.34g mass.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN low-saturation transistor applications.

Compared with ZXT849KTC, ZXTN2012E6TA trades voltage rating for lower saturation, while MJD122T4G prioritizes breakdown safety over efficiency-making ZXT849KTC the optimal balance for 24V automotive power stages requiring both robustness and thermal efficiency.

Availability

ZXT849KTC is available at Aetrix Electronics and suitable for DC-DC converters, automotive motor control, and industrial power switches requiring stable component supply with AEC-Q101 qualification and RoHS 3 compliance.

Supply support for ZXT849KTC 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 and manufacturing operations across Asia and the US.

The ZXT series targets high-reliability power switching applications, specifically engineered for low-saturation performance, AEC-Q101 compliance, and thermally efficient DPAK packaging in automotive and industrial power systems.

FAQ

What is the maximum allowable PCB copper area for thermal performance validation?

The datasheet specifies R_θJA = 59°C/W for a 25mm × 25mm 1oz copper pad. To achieve this value, the exposed collector pad must be fully soldered to that copper area with no thermal vias required. Larger copper (e.g., 50mm × 50mm) improves R_θJA to 39°C/W, but layout must maintain solder mask clearance around the tab per Diodes' recommended pad dimensions.

Can ZXT849KTC replace a MOSFET in low-side switching applications?

ZXT849KTC is not a drop-in MOSFET replacement due to its current-driven base requirement and lack of inherent body diode. However, it can serve as a low-cost, high-current alternative in applications where gate drive complexity is acceptable and V_CE(SAT) loss is more critical than switching speed-such as fixed-frequency 20–100kHz DC-DC outputs where t_OFF = 630ns is sufficient.

Is the TO252 footprint compatible with standard DPAK land patterns?

Yes-the ZXT849KTC uses industry-standard TO252 (DPAK) mechanical dimensions per Diodes' package outline DS33641 Rev. 3. Pin pitch (e = 2.286mm), lead width (b = 0.64–0.88mm), and tab size (D1 = 5.21mm) match JEDEC MO-263AB. Verified compatibility with IPC-7351B DPAK-3 land pattern ensures manufacturability on automated SMT lines.

Does the AEC-Q101 qualification cover temperature cycling and humidity testing?

Yes-AEC-Q101 qualification for ZXT849KTC includes temperature cycling (−55°C to +150°C, 1000 cycles), unbiased highly accelerated stress test (uHAST), and high-temperature reverse bias (HTRB) per stress test conditions defined in the AEC-Q101-003 and AEC-Q101-009 standards, confirming reliability for under-hood automotive deployment.