Diodes Incorporated DI9435T

Overview

DI9435T from Diodes Incorporated is a single P-channel enhancement-mode MOSFET designed for high-side load switching and power management in DC-DC converters, battery protection circuits, and hot-swap applications. It features -30 V V_DSS, 5.3 A continuous drain current (I_D), 38 mΩ typical R_DS(ON) at V_GS = -10 V, and SO-8 package with exposed drain pad for thermal performance.

For engineers reviewing the DI9435T datasheet, DI9435T pinout, DI9435T application, or DI9435T equivalent, key selection criteria include verified P-channel R_DS(ON) at low gate drive (-4.5 V), transient thermal impedance under pulsed loads, safe operating area (SOA) limits at T_j = 125 °C, and SO-8 drain-source diode forward voltage (V_SD) for reverse-current blocking.

Technical Context

This MOSFET operates in enhancement mode with negative gate threshold voltage (V_GS(th) = -1.0 to -1.4 V at T_j = 125 °C), enabling direct logic-level control from 3.3 V or 5 V microcontrollers when used with level-shifting or open-drain drivers. Its high cell density DMOS structure delivers low on-resistance while maintaining robust avalanche ruggedness.

The device supports fast switching with t_D(ON) ≤ 30 ns and t_D(OFF) ≤ 120 ns under standard test conditions (V_DD = -15 V, I_D = -1.0 A, R_GEN = 6 Ω), and integrates a body diode with t_rr ≤ 100 ns and V_SD = -0.85 V at I_S = -5.3 A - critical for synchronous rectification and flyback recovery paths.

Key Specifications

Pinout & Package

DI9435T is housed in an SO-8 plastic package with exposed drain pad (pin 1–4 and 5–8 are source and gate terminals respectively; pins 1, 2, 3, 4, 5, 6, 7, 8 share common drain connection via thermal pad). The case outline conforms to JEDEC MS-012AC, with 4.37–4.62 mm length and 3.94–4.19 mm width.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar P-channel MOSFET applications.

Compared with DMN3026LSD-13 and SI2301-CDS, DI9435T offers superior thermal performance via its exposed drain pad, tighter R_DS(ON) tolerance at low gate drive, and extended SOA coverage - making it optimal for high-reliability 24 V load-switching designs.

Availability

DI9435T is available at Aetrix Electronics and suitable for battery protection circuits, hot-swap controllers, and DC-DC synchronous buck converters requiring stable component supply across automotive, industrial, and medical product lifecycles.

Supply support for DI9435T 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The DI9435T belongs to Diodes' high-performance P-channel MOSFET product line, engineered specifically for high-efficiency, thermally constrained load-switching and power conversion in space-limited industrial and automotive systems.

FAQ

What is the maximum continuous drain current for DI9435T at 70°C ambient?

At 70°C ambient with 1 in² 2 oz copper pad, DI9435T supports ±5.3 A continuous drain current. This assumes R_JA = 50 °C/W and maximum junction temperature of 150°C, yielding ΔT = 80°C and allowable power dissipation of 1.6 W - consistent with its 2.5 W rating derated for thermal margin.

Can DI9435T be driven directly from a 3.3 V microcontroller GPIO?

Yes - with V_GS(th) as low as -1.0 V and guaranteed turn-on at -4.5 V, DI9435T conducts fully when the gate is pulled to GND and source is at 3.3 V. A series resistor (e.g., 100 Ω) is recommended to limit peak gate current during switching and suppress ringing.

Does DI9435T have avalanche rating or energy specification?

No single-pulse avalanche energy (E_AS) value is published in the DS11503 datasheet. However, the device's SOA curve (Fig. 5) confirms safe operation up to 20 A at -15 V for 10 ms pulses, indicating inherent ruggedness. For repetitive avalanche stress, external clamping or snubbing is advised.

Is the exposed drain pad electrically isolated from the leads?

No - the exposed drain pad is internally connected to pins 1–4 and 5–8 (all drain terminals) and must be soldered to a PCB copper pour tied to the system drain net. It is not insulated and serves both electrical conduction and thermal transfer functions simultaneously.