Diodes Incorporated ZDT6757TA

Overview

ZDT6757TA from Diodes Incorporated is a complementary medium-power bipolar transistor pair (NPN+PNP) in a single SM-8 (SOT-223-8) package, rated for 300 V V_CEO, 0.5 A continuous I_C, and 2.75 W dual-die power dissipation. It serves as a high-voltage switching or linear amplification stage in offline power supplies, relay drivers, and industrial motor controls where matched complementary gain and breakdown are required.

For engineers reviewing the ZDT6757TA datasheet, ZDT6757TA pinout, ZDT6757TA application, or ZDT6757TA equivalent, key selection criteria include verified V_CEO/V_CBO symmetry, h_FE matching across polarity, thermal derating at elevated ambient, and SM-8 footprint compatibility with PCB copper area constraints.

Technical Context

The ZDT6757TA integrates two discrete silicon planar epitaxial transistors - one NPN (Q1) and one PNP (Q2) - on a shared leadframe within an SM-8 thermally enhanced package. Both devices share identical absolute maximum ratings: ±300 V V_CEO, ±5 V V_EBO, and ±1 A I_CM, enabling symmetrical high-side/low-side switching in half-bridge configurations.

Electrical characteristics confirm matched DC gain (h_FE = 50 min @ I_C = −100 mA / +100 mA), consistent saturation behavior (V_CE(sat) = ±0.5 V @ I_C = ±100 mA), and identical small-signal performance (f_T = 30 MHz, C_obo = 20 pF), supporting stable operation in Class-B amplifier stages and PWM-driven inductive loads.

Key Specifications

Pinout & Package

Package: SM-8 (8-lead SOT-223 variant), thermally optimized with exposed die pad for junction-to-board conduction. Mounting requires ≥2 in² copper area per device for rated power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar complementary high-voltage transistor applications.

Compared with ZDT6757TA, ZXTD6717E6 trades voltage headroom for gain and size, while MMBT6757 sacrifices integration and symmetry for modularity - making ZDT6757TA optimal for space- and symmetry-critical high-voltage complementary switching.

Availability

ZDT6757TA is available at Aetrix Electronics and suitable for industrial relay drivers, offline AC-DC power supplies, and half-bridge motor controllers requiring stable component supply and long-term manufacturability.

Supply support for ZDT6757TA 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 power management, signal integrity, and protection solutions for industrial and automotive markets.

ZDT6757TA belongs to Diodes' high-voltage complementary transistor family, designed specifically for robust, thermally efficient switching in mains-connected equipment where safety margins and long-term stability are critical.

FAQ

What is the thermal resistance of ZDT6757TA when both transistors operate simultaneously?

The thermal resistance from junction to ambient (θ_JA) is 45.5 °C/W when both NPN and PNP dies are active under standard mounting conditions (2 in² copper). This value assumes uniform heat spreading and excludes forced airflow or heatsink augmentation. Derating begins at 22 mW/°C above 25°C ambient.

Can ZDT6757TA be used in linear amplifier applications?

Yes - its 30 MHz f_T, low output capacitance (20 pF), and matched h_FE make it suitable for Class-B audio output stages and precision linear regulators. However, thermal design must accommodate 2.75 W total dissipation, and V_CE must remain below 300 V to avoid secondary breakdown.

Is the SM-8 package lead-free and RoHS compliant?

Yes - ZDT6757TA is manufactured in a lead-free, RoHS-compliant SM-8 package per Diodes Incorporated's standard qualification. The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and supports standard reflow profiles including peak temperatures up to 260°C.

How does ZDT6757TA differ from the older ZDT6757 (non-TA) variant?

ZDT6757TA features tighter parametric screening and enhanced process control versus the legacy ZDT6757, resulting in improved h_FE consistency and reduced V_CE(sat) variation across production lots. The TA suffix denotes Diodes' qualified automotive-grade screening option, though the part remains industrial-qualified unless explicitly ordered with AEC-Q101 marking.