Diodes Incorporated DSS3515M-7B

Overview

DSS3515M-7B from Diodes Incorporated is a PNP low-saturation bipolar junction transistor (BJT) in X1-DFN1006-3 package, rated for -15V V_CEO, -500mA continuous collector current, and 400mW power dissipation at ambient. It delivers V_CE(sat) = -250mV at I_C = -500mA/I_B = -50mA and supports automotive-grade reliability per AEC-Q standards. It is used in space-constrained load switching and battery protection circuits.

For engineers reviewing the DSS3515M-7B datasheet, DSS3515M-7B pinout, DSS3515M-7B application, or DSS3515M-7B equivalent, key selection criteria include its ultra-small 0.6mm × 1.0mm footprint, low-profile 0.5mm height, JEDEC-qualified thermal performance, and complementary pairing with DSS2515M for push-pull designs.

Technical Context

This PNP BJT operates as a high-current, low-V_CE(sat) switch in DC-coupled configurations, with guaranteed breakdown ratings of -15V V_CBO/V_CEO and -6V V_EBO. Its h_FE ranges from 90 to 200 across I_C = -10mA to -500mA at V_CE = -2V, enabling stable current amplification in bias-controlled drivers.

Thermal design relies on its exposed collector pad: R_θJA is 310°C/W on minimal PCB copper and improves to 120°C/W with 25mm × 25mm 2oz copper, while R_θJL = 120°C/W confirms efficient heat transfer to the solder joint. ESD robustness includes 4kV HBM and 200V MM ratings.

Key Specifications

Pinout & Package

Package: X1-DFN1006-3 - 0.6mm × 1.0mm × 0.5mm molded plastic package with exposed collector pad, NiPdAu-plated terminals, and UL 94V-0 rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP low-saturation transistor applications.

Compared with DSS3515M-7B, DSS3515MQ offers identical performance with certified automotive qualification, while DMT3005LFG-7 replaces base-drive dependency with gate-drive simplicity but sacrifices linear-mode capability and introduces capacitive switching losses.

Availability

DSS3515M-7B is available at Aetrix Electronics and suitable for automotive body electronics, portable medical instrumentation, and industrial sensor interface designs requiring stable component supply and long-term manufacturability.

Supply support for DSS3515M-7B 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 North America.

The DSS3515M belongs to Diodes' X1-DFN series of ultra-miniature transistors, engineered specifically for space- and thermal-constrained switching applications in automotive, industrial, and portable electronics.

FAQ

What is the maximum allowable junction temperature for DSS3515M-7B?

The absolute maximum junction temperature is +150°C, as specified in the Operating Temperature Range (T_J). This limit applies under steady-state conditions with appropriate PCB copper area and ambient airflow. Derating begins at +25°C ambient, and thermal design must ensure T_J remains below 150°C at worst-case I_C and ambient conditions.

Can DSS3515M-7B be used in linear (analog) mode, not just switching?

Yes - its specified V_CE(sat), h_FE, and f_T characteristics support linear operation. The device maintains h_FE > 90 from I_C = -10mA to -500mA at V_CE = -2V, and typical V_BE(on) = -0.9V enables predictable biasing. However, power dissipation must remain within PD = 400mW (on minimal copper) or 1000mW (with enhanced copper), limiting usable linear output swing.

Is the exposed collector pad electrically isolated or must it be grounded?

The exposed collector pad is electrically connected to the collector terminal (Pin 3) and must be soldered to a PCB copper pour that serves as both thermal path and electrical node. It is not isolated - connecting it to system ground or the load return path is required for proper thermal and electrical performance. Floating the pad violates thermal specifications and risks premature failure.

How does DSS3515M-7B differ from the -7 variant?

DSS3515M-7B differs only in packaging quantity: it ships in 10,000-unit reels with 8mm tape width, whereas DSS3515M-7 uses 3,000-unit reels. All electrical, thermal, mechanical, and marking specifications - including X1-DFN1006-3 package, TB top-side marking, and AEC-Q qualification - are identical between the two part numbers.