Diodes Incorporated DSS5320T-7

Overview

DSS5320T-7 from Diodes Incorporated is a PNP bipolar junction transistor in SOT-23 package, rated for -20 V V_CEO, -2 A continuous collector current, and ultra-low -70 mV V_CE(sat) at I_C = -0.5 A / I_B = -50 mA. It serves as a medium-power switching or amplification device in automotive body control modules, LED driver current sinks, and industrial load switches.

For engineers reviewing the DSS5320T-7 datasheet, DSS5320T-7 pinout, DSS5320T-7 application, or DSS5320T-7 equivalent, key selection criteria include its AEC-Q101 qualification, low saturation voltage under high-current drive, thermal resistance of 209 °C/W on standard FR4, and compatibility with lead-free reflow profiles.

Technical Context

This PNP transistor uses epitaxial planar die construction to achieve stable DC current gain (h_FE = 220–100 across I_C = -0.1 A to -3 A) and fast switching performance (t_on = 67 ns, t_off = 224 ns). Its breakdown ratings-V_CBO = -20 V, V_EBO = -5 V-define safe operating limits for emitter-referenced biasing schemes.

The device operates across -55 °C to +150 °C and maintains R_CE(sat) = 105 mΩ at I_E = -2 A / I_B = -200 mA, enabling efficient low-side switching in thermally constrained PCB layouts. Its f_T = 100–180 MHz supports moderate-frequency signal amplification.

Key Specifications

Pinout & Package

Package: SOT-23, molded green plastic housing (UL 94V-0), matte tin-plated copper leadframe, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT3906LT1G and ZTX951, DSS5320T-7 delivers superior current handling and lower conduction loss in surface-mount automotive and industrial systems, while maintaining AEC-Q101 compliance and green packaging requirements.

Availability

DSS5320T-7 is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC output stages, and consumer appliance motor drivers requiring stable component supply and long-term lifecycle support.

Supply support for DSS5320T-7 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 components for automotive, industrial, and computing markets.

The DSS5320T-7 belongs to Diodes' AEC-Q101-qualified discrete transistor product line, engineered for robust switching and amplification in harsh-environment applications where thermal stability and process consistency are critical.

FAQ

What is the maximum continuous collector current for DSS5320T-7 at 100°C ambient?

At T_A = 100 °C, the maximum continuous collector current is derated to approximately -1.1 A, calculated using the 209 °C/W thermal resistance and 600 mW maximum power dissipation at 25 °C. This assumes mounting on a 15 mm × 15 mm × 1.6 mm FR4 PCB with 1 oz copper.

Is DSS5320T-7 suitable for driving inductive loads like relays?

Yes - its safe operating area (SOA) supports repetitive peak currents up to -5 A (pulse width ≤100 ms, duty cycle ≤0.25), and it tolerates inductive flyback when used with appropriate snubbing or clamping diodes. The -20 V V_CEO rating accommodates typical 12 V system transients.

Does DSS5320T-7 require a base resistor when driven by a 3.3 V microcontroller GPIO?

Yes - a series base resistor is required to limit base current. For I_C = -500 mA and h_FE = 220, minimum I_B ≈ -2.3 mA is needed; with 3.3 V GPIO and V_BE(sat) ≈ -1.1 V, a 910 Ω resistor sets appropriate drive while ensuring saturation.

How does the "Green" designation affect soldering profile compatibility?

The halogen- and antimony-free green molding compound is fully compatible with standard lead-free reflow profiles (J-STD-020 Class 3), including peak temperatures up to 260 °C. Moisture sensitivity level 1 eliminates bake requirements prior to assembly.