Diodes Incorporated ZDT6702TA

Overview

ZDT6702TA from Diodes Incorporated is a complementary medium-power Darlington transistor pair (NPN+PNP) in a single SM-8 surface-mount package, rated for 60 V V_CEO, 1.75 A continuous collector current per device, and 2.75 W total power dissipation with both dies active. It delivers high DC current gain (h_FE up to 13k at 10 mA) and fast switching (t_on ≤ 0.75 µs, t_off ≤ 2.1 µs), enabling use in automotive relay drivers and industrial solenoid control circuits.

For engineers reviewing the ZDT6702TA datasheet, ZDT6702TA pinout, ZDT6702TA application, or ZDT6702TA equivalent, key selection criteria include complementary Darlington configuration, SM-8 thermal performance (45.5 °C/W θ_JA with both dies on), V_CE(sat) ≤ 1.28 V at 1.75 A, and AEC-Q101 qualification readiness for automotive-grade designs.

Technical Context

The ZDT6702TA integrates matched NPN and PNP Darlington transistors on a single die substrate within an SM-8 thermally enhanced plastic package. Each transistor features built-in base-emitter resistors and achieves h_FE ≥ 5,000 at low current (10 mA) and ≥ 2,000 at high current (2 A), supporting robust current amplification across wide operating ranges.

Its absolute maximum ratings include ±80 V V_CBO, ±60 V V_CEO, and ±10 V V_EBO, with thermal derating of 22 mW/°C when both transistors operate simultaneously - confirming suitability for dual-polarity load switching where space-constrained PCB layouts demand integrated complementary drive capability.

Key Specifications

Pinout & Package

Package: SM-8, 8-pin surface-mount molded plastic package with matte tin-plated leads, UL 94V-0 rating, and 0.117 g mass. Designed for reflow soldering at +260°C for 30 seconds per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar complementary Darlington transistor applications.

Compared with ZDT6702TA, ZXTDA6717D offers higher voltage margin but requires separate NPN/PNP placement and sacrifices gain, while MMBT6427 is fundamentally unsuited for medium-power switching due to its 0.35 W limit and absence of Darlington architecture.

Availability

ZDT6702TA is available at Aetrix Electronics and suitable for automotive relay drivers, industrial solenoid control, and DC motor direction control requiring stable component supply and long-term production continuity.

Supply support for ZDT6702TA 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 ZDT6702TA belongs to Diodes' high-reliability bipolar transistor product line, engineered specifically for automotive and industrial applications demanding AEC-Q101 readiness, tight parameter matching, and thermally robust packaging.

FAQ

Is ZDT6702TA qualified to AEC-Q101?

No - ZDT6702TA itself is not AEC-Q101 certified, but Diodes states it is manufactured in IATF 16949-certified facilities with PPAP capability and supports automotive qualification paths. Customers must initiate formal AEC-Q101 testing and validation through Diodes' automotive program to obtain certified status for their specific application and lot traceability requirements.

What is the recommended PCB pad layout for SM-8 package?

The official SM-8 pad layout specifies C = 1.52 mm, C1 = 4.60 mm, X = 0.95 mm, Y = 2.80 mm, and Y1 = 6.80 mm (all in mm). These dimensions ensure optimal solder joint formation, thermal transfer to internal copper planes, and mechanical reliability during thermal cycling - deviations exceeding ±0.05 mm increase risk of tombstoning or voiding in reflow profiles.

Can ZDT6702TA replace two discrete SOT-223 Darlington transistors?

Yes - ZDT6702TA provides identical electrical functionality to two discrete SOT-223 Darlington transistors (e.g., ZTX653 + ZTX753) but in a single SM-8 package with superior thermal coupling, matched characteristics, and 35% smaller footprint. Its 45.5 °C/W θ_JA (both on) outperforms typical SOT-223 dual layouts by ≥20%, enabling higher sustained current in space-constrained designs.

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

This notice indicates Diodes has introduced newer-generation alternatives (e.g., ZXTDA series) with improved efficiency, higher voltage ratings, or smaller footprints. However, ZDT6702TA remains fully supported for legacy production, second-sourcing, and applications where its proven thermal performance, high h_FE, and complementary integration provide measurable design advantages over newer options.