Diodes Incorporated DXT458P5-13

Overview

DXT458P5-13 from Diodes Incorporated is an NPN silicon planar high-voltage transistor in PowerDI®5 package, rated for V_CEO = 400 V, I_C = 300 mA (continuous), and P_D = 2.8 W on 50 mm × 50 mm 2 oz. copper PCB. It delivers low V_CE(sat) of 500 mV at I_C = 50 mA / I_B = 6 mA and supports fast switching with t_on/t_off = 135 ns / 2260 ns - used as a PSU startup switch in offline AC-DC converters.

For engineers reviewing the DXT458P5-13 datasheet, DXT458P5-13 pinout, DXT458P5-13 application, or DXT458P5-13 equivalent, key selection criteria include high-voltage blocking capability (400 V), compact 1.1 mm height PowerDI®5 footprint, thermal resistance (R_θJA = 45 °C/W under optimized layout), and verified h_FE range of 100–300 at I_C = 1–100 mA.

Technical Context

This NPN transistor is designed for high-voltage switching in power supply auxiliary circuits, where robust V_CEO = 400 V and low saturation voltage enable efficient start-up sequencing without external snubbers. Its f_T = 50 MHz and C_obo = 5 pF support stable operation up to high-frequency flyback control loops.

The device uses a planar silicon structure with matte tin–annealed copper leadframe, achieving R_θJT = 14 °C/W to collector terminal and operating across –55 °C to +150 °C. Thermal derating is defined for three PCB pad configurations, enabling precise thermal design in space-constrained telecom and industrial PSUs.

Key Specifications

Pinout & Package

Package: PowerDI®5 - surface-mount, 3-terminal plastic package with exposed collector tab for thermal and electrical connection. Dimensions: 4.0 mm × 6.5 mm × 1.1 mm (L × W × H); weight ≈ 0.093 g; moisture sensitivity level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN switching applications.

Compared with ZTX653STZ and MJD44H11G, DXT458P5-13 uniquely balances 400 V rating, ultra-low profile (1.1 mm), and optimized thermal resistance (45 °C/W) in a 3-pin surface-mount package - making it the most space- and thermally efficient choice for modern compact PSU auxiliary switches.

Availability

DXT458P5-13 is available at Aetrix Electronics and suitable for PSU startup switch, telecom DC-DC bias supply, and industrial sensor interface applications requiring stable component supply, long-lifecycle availability, and RoHS-compliant sourcing.

Supply support for DXT458P5-13 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, manufacturing, and sales operations across Asia, Europe, and the Americas.

The DXT458P5 belongs to Diodes' Power Transistor product line, engineered specifically for high-voltage, low-power switching in auxiliary power circuits - emphasizing compactness, thermal efficiency, and reliability in space-constrained power conversion systems.

FAQ

What is the maximum continuous collector current for DXT458P5-13?

The maximum continuous collector current is 300 mA at T_A = 25 °C with specified PCB layout (50 mm × 50 mm, 2 oz. copper). At elevated ambient temperatures, derating applies per the datasheet curve - e.g., ~180 mA at 85 °C ambient under same conditions.

Can DXT458P5-13 replace a standard SOT-223 NPN transistor in existing designs?

Yes, but only with PCB layout revision: PowerDI®5 has different pad dimensions (4.0 mm × 6.5 mm) and thermal pad placement versus SOT-223. The exposed collector tab must connect to a dedicated copper pour; direct footprint swap will cause thermal failure and solder joint reliability issues.

Is DXT458P5-13 suitable for automotive applications?

No - it is not AEC-Q101 qualified, lacks automotive-grade screening, and its guaranteed operating range (–55 °C to +150 °C) does not include automotive-specific stress tests (e.g., HTOL, temperature cycling). Use only in industrial, telecom, or consumer power supplies.

What is the recommended base resistor value for driving DXT458P5-13 in a 12 V control circuit?

For I_C = 50 mA and h_FE ≥ 100, minimum I_B = 0.5 mA is required. With V_BE(sat) ≈ 0.9 V, a 22 kΩ resistor limits base current to ~0.5 mA from 12 V - verified in typical application circuits on Diodes Inc. AN-5012.