Diodes Incorporated DMJT9435-13

Overview

DMJT9435-13 from Diodes Incorporated is a low V_CE(SAT) PNP bipolar junction transistor in SOT-223 package, rated for -3 A continuous collector current, -30 V V_CEO, and 3 W power dissipation at T_C = 25°C; it delivers 83–183 mΩ equivalent on-resistance at -3 A/-300 mA drive and is used in medium-power DC switching circuits such as industrial relay drivers and LED load controls.

For engineers reviewing the DMJT9435-13 datasheet, DMJT9435-13 pinout, DMJT9435-13 application, or DMJT9435-13 equivalent, key selection criteria include verified V_CE(SAT) ≤ -275 mV at -1.2 A/-20 mA, h_FE ≥ 90 at -3 A, thermal resistance R_θJC = 42 °C/W, and SOT-223 mounting compatibility with 1-inch² copper pad layout for 2 W operation.

Technical Context

This PNP BJT operates in linear amplification or saturated switching mode with base-emitter turn-on voltage of -1.1 V at -1.2 A and saturation voltage as low as -100 mV at -0.8 A/-20 mA drive. Its f_T of 160 MHz supports high-speed switching with ton = 200 ns and toff = 155 ns under -15 V V_CC, -1.2 A I_C conditions.

Thermal performance is defined across three mounting configurations: 1.2 W (FR-4 min pad), 2 W (FR-4 1-inch² pad), and 3 W (case-mounted). Cutoff characteristics include V_(BR)CEO = -30 V, V_(BR)EBO = -6 V, and ICER ≤ -200 μA at 125°C with R_BE = 200 Ω.

Key Specifications

Pinout & Package

Package: SOT-223 - surface-mount plastic case with exposed thermal pad (pin 4), UL 94V-0 rated, moisture sensitivity level 1, 0.115 g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX951 and MJD2955T4G, DMJT9435-13 uniquely balances -3 A current, -275 mV V_CE(SAT), and SOT-223 thermal efficiency (R_θJA = 62.5 °C/W), making it optimal for space-constrained 1–3 A switching where low conduction loss and PCB-level heatsinking are prioritized.

Availability

DMJT9435-13 is available at Aetrix Electronics and suitable for industrial relay drivers, LED constant-current sinks, and DC motor brake control circuits requiring stable component supply and RoHS-compliant manufacturing.

Supply support for DMJT9435-13 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 and manufacturing operations across Asia and the Americas.

The DMJT9435-13 belongs to Diodes' general-purpose PNP transistor product line, engineered for cost-effective, thermally robust medium-power switching in industrial and consumer power management systems.

FAQ

What is the maximum safe operating temperature for DMJT9435-13?

The DMJT9435-13 has an operating junction temperature range of -55°C to +150°C. Its absolute maximum rating requires derating above 25°C ambient based on thermal resistance: with 1-inch² copper pad (R_θJA = 62.5 °C/W), maximum continuous power drops to 1.2 W at 75°C ambient. Thermal shutdown is not built-in; external thermal monitoring is recommended for sustained >100°C operation.

Can DMJT9435-13 be driven directly from a 3.3 V microcontroller GPIO?

Yes - with I_B = -300 mA required for full -3 A conduction, a 3.3 V GPIO cannot source sufficient base current. However, at -1.2 A load, only -20 mA base drive is needed, which is compatible with most 3.3 V MCUs via series resistor. For full-rated current, a dedicated base driver stage or logic-level shifter is necessary to achieve -300 mA.

Is the SOT-223 thermal pad (pin 4) electrically isolated?

No - pin 4 is internally connected to the collector (pins 1 and 4 are electrically common). The exposed pad serves solely for thermal conduction and must be soldered to a large copper pour tied to the collector net. Electrical isolation is not provided; routing over adjacent signals requires clearance per IPC-2221 creepage requirements for -30 V potential.

How does DMJT9435-13 compare to NPN alternatives like DMN3020LSD?

DMJT9435-13 is a PNP device intended for high-side switching where the load connects to ground - unlike NPN transistors that require low-side placement. Its -30 V V_CEO and low V_CE(SAT) provide superior efficiency in positive-rail switching vs. NPN solutions needing level-shifting. It is not a drop-in replacement for NPNs due to inverted polarity and complementary biasing requirements.