Diodes Incorporated DXT651-13

Overview

DXT651-13 from Diodes Incorporated is a 60V NPN medium-power transistor in SOT89 package, rated for 3A continuous collector current and 6A peak pulse current, with V_CE(sat) < 300 mV at 1 A, used in motor control and DC-DC converter load switching circuits.

For engineers reviewing the DXT651-13 datasheet, DXT651-13 pinout, DXT651-13 application, or DXT651-13 equivalent, this part supports high-current switching at low saturation voltage, requires thermal-aware PCB layout on ≥40 mm² copper, and serves as a complementary NPN to DXT751 in dual-transistor designs.

Technical Context

This NPN bipolar junction transistor operates in linear or saturated switching mode with guaranteed BV_CEO ≥ 60 V and V_BE(sat) ≤ 1.25 V at I_C = 1 A / I_B = 100 mA. Its f_T of 140–200 MHz enables use in medium-frequency switching applications up to several hundred kHz.

Thermal design relies on its exposed collector pad (R_θJL = 6 °C/W) and junction-to-case resistance of 26 °C/W; power derating begins above 25 °C ambient, reaching zero dissipation at 150 °C per the published curve.

Key Specifications

Pinout & Package

Package: SOT89 - Surface-mount plastic package with exposed collector tab for thermal and electrical connection; 3-terminal configuration with standardized footprint per Diodes' outline drawing (SOT89, Dim A=1.50 mm, D=4.50 mm, E=2.50 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD127-13 and ZTX653, DXT651-13 uniquely balances 3 A continuous current, 60 V rating, and ultra-low V_CE(sat) in the compact SOT89 footprint-making it optimal for thermally constrained, medium-power switching where both voltage headroom and conduction loss matter.

Availability

DXT651-13 is available at Aetrix Electronics and suitable for motor controls, DC-DC converters, and industrial load management systems requiring stable component supply, RoHS-compliant packaging, and traceable sourcing.

Supply support for DXT651-13 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, specializing in high-reliability power management and signal integrity solutions for industrial, computing, and automotive markets.

DXT651 belongs to Diodes' medium-power bipolar transistor product line, engineered for robust switching in space-constrained, thermally demanding applications like motor drives and DC-DC regulation.

FAQ

What is the maximum allowable junction temperature for DXT651-13?

The absolute maximum junction temperature is +150 °C, as specified in the Thermal Characteristics table. Operation beyond this limit risks permanent degradation of h_FE and increased leakage. Derating curves show power must be reduced linearly above +25 °C ambient, reaching zero dissipation at +150 °C for the 40 mm × 40 mm PCB condition.

Can DXT651-13 replace a MOSFET in low-side switching applications?

No-it is a bipolar transistor requiring continuous base current for saturation, unlike MOSFETs that are voltage-controlled. For 3 A loads, base drive must supply ≥150 mA (assuming h_FE = 20), increasing driver complexity and power loss. Use only where BJT advantages-like ruggedness to SOA stress or cost sensitivity-outweigh gate-drive overhead.

Is the exposed collector pad electrically isolated from other terminals?

No-the collector pad is electrically connected to the collector terminal (Pin C). It must be routed to the same net as the collector trace and tied to a thermal plane that does not violate isolation requirements. In high-voltage designs, ensure clearance between the pad and adjacent low-voltage traces per IPC-2221.

Does DXT651-13 meet AEC-Q101 for automotive use?

The standard DXT651-13 is not AEC-Q101 qualified. However, the automotive-grade variant DXT651Q is explicitly qualified per AEC-Q101 Rev D and documented in a separate datasheet (DS31184Q). For automotive applications, DXT651Q-not DXT651-13-must be specified and sourced.