Diodes Incorporated ZDT751TC

Overview

ZDT751 from Diodes Incorporated is a dual PNP medium-power transistor in SM-8 package, rated for V_CEO = −60 V, I_C = −2 A continuous, and P_tot = 2.75 W (both dies on), with h_FE = 70–300 at I_C = −50 mA to −2 A. It serves as a high-current switching or linear amplification stage in automotive body control modules and industrial relay drivers.

For engineers reviewing the ZDT751 datasheet, ZDT751 pinout, ZDT751 application, or ZDT751 equivalent, key selection considerations include its dual-die thermal derating (22 mW/°C), V_CE(sat) = −0.15 V @ I_C = −1 A / I_B = −100 mA, AEC-Q101 qualification status, and SM-8 footprint compatibility with space-constrained PCB layouts.

Technical Context

The ZDT751 integrates two independent PNP transistors in a single SM-8 thermally enhanced plastic package, sharing a common emitter configuration per die. Each die supports −6 A peak pulse current and operates across −55°C to +150°C junction temperature range.

Its electrical behavior is defined by guaranteed V_(BR)CEO = −60 V, V_CE(sat) ≤ −0.3 V at I_C = −2 A, and f_T ≥ 100 MHz, enabling use in medium-speed switching (<500 kHz) and analog gain stages where low saturation voltage and stable h_FE over current range are critical.

Key Specifications

Pinout & Package

Package: SM-8, surface-mount, 8-pin dual-in-line outline with exposed thermal pad (non-electrical), molded plastic UL 94V-0 housing, matte tin-plated leads solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZDT751, ZXT10P20DE6 offers smaller size but sacrifices voltage robustness and dual-channel integration, while DMT3005LSDQ delivers higher power capability and better thermal performance in a slightly larger package-making it the recommended upgrade path for new automotive designs.

Availability

ZDT751 is available at Aetrix Electronics and suitable for automotive body control modules, industrial relay drivers, DC motor direction control circuits, and LED string current sink applications requiring stable component supply and legacy design support.

Supply support for ZDT751 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 ZDT751 belongs to Diodes' automotive-qualified bipolar transistor product line, engineered specifically for high-reliability medium-power switching in harsh-environment applications such as engine control, lighting, and power distribution.

FAQ

Is ZDT751 AEC-Q101 qualified?

Yes, the ZDT751 is qualified to AEC-Q101 for automotive applications. Documentation confirms qualification testing per stress test requirements, PPAP capability, and manufacture in IATF 16949 certified facilities. Full qualification reports are available upon request through Diodes' automotive support team.

What is the thermal pad on pins 7 and 8 used for?

Pins 7 and 8 form a single exposed thermal pad on the underside of the SM-8 package. It is non-electrical and intended solely for thermal conduction to the PCB. To achieve rated P_tot, this pad must be soldered to a minimum 2-inch² copper area using appropriate stencil and reflow profile per JEDEC J-STD-020.

Can ZDT751 be used in linear amplifier configurations?

Yes, the ZDT751 supports linear operation with h_FE specified from −50 mA to −2 A and V_CE = −2 V. Its −60 V V_CEO and 2.75 W dissipation allow Class-A or AB biasing in low-frequency audio or sensor signal conditioning stages, provided thermal design accommodates steady-state power.

Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?

This notice reflects Diodes' strategic roadmap: newer alternatives like DMT3005LSDQ offer improved thermal performance, higher current rating, and extended lifetime. The ZDT751 remains fully qualified and supported for legacy production and repair, but Diodes encourages migration for new projects to ensure long-term supply and enhanced reliability.