Diodes Incorporated DDZ6V8B-7

Overview

DDZ6V8B-7 from Diodes Incorporated is a surface-mount precision Zener diode optimized for voltage regulation and reference applications in space-constrained PCBs. It delivers a tightly controlled zener voltage of 6.49–6.83 V at 20 mA test current, with low dynamic impedance (5 Ω at 1 kHz), low reverse leakage (0.5 µA at 5.0 V), and operates across –65°C to +150°C. It is widely used in power supply feedback loops, analog sensor biasing, and ADC reference stabilization.

For engineers reviewing the DDZ6V8B-7 datasheet, DDZ6V8B-7 pinout, DDZ6V8B-7 application, or DDZ6V8B-7 equivalent, key selection criteria include zener voltage tolerance (±2.5%), thermal resistance (425 °C/W on minimal pad layout), cathode-band polarity marking, SOD123 package compatibility, and RoHS-compliant matte tin terminations.

Technical Context

This device functions as a two-terminal voltage reference diode operating in reverse breakdown mode. Its precision is achieved via tight process control over zener voltage distribution (±2.5% at I_ZT = 20 mA) and low temperature coefficient (≈+0.04 %/°C near 6.8 V), enabling stable regulation under varying ambient conditions.

The SOD123 package supports automated placement and reflow soldering, with a single cathode-band terminal indicating polarity. Thermal performance depends critically on PCB copper area - R_θJA degrades from 266 °C/W (1 in² pad) to 425 °C/W (minimum recommended pad), directly impacting maximum allowable power dissipation.

Key Specifications

Pinout & Package

SOD123 is a two-terminal surface-mount package with cathode identified by a visible band on the body. The device has no active anode/cathode labeling beyond this band; polarity must be observed during layout to ensure correct reverse-bias operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode voltage reference applications.

Compared with BZX84-C6V8 and MMSZ4688, DDZ6V8B-7 offers superior voltage accuracy and lower impedance in the same compact SOD123 form factor, making it preferred for high-stability feedback and reference designs where thermal management aligns with its 425 °C/W rating.

Availability

DDZ6V8B-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive body control modules, and PLC input protection circuits requiring stable component supply and consistent parametric performance across production batches.

Supply support for DDZ6V8B-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations spanning Asia, Europe, and North America.

The DDZ series targets precision voltage reference and regulation in cost-sensitive, high-volume applications - emphasizing tight V_Z tolerance, low Z_ZT, and full RoHS/Green compliance without sacrificing thermal or reliability performance.

FAQ

What is the maximum continuous power dissipation for DDZ6V8B-7 at 75°C ambient?

The maximum power dissipation is 500 mW at T_L = +75°C (lead temperature), per the Absolute Maximum Ratings table. This assumes proper thermal conduction through leads - not ambient air. At T_A = +75°C, derating applies: using the Note 8 curve, P_D drops to approximately 220 mW on minimal PCB pad layout due to R_θJA = 425 °C/W.

Is DDZ6V8B-7 qualified for automotive applications?

No - DDZ6V8B-7 is the commercial-grade variant. Automotive qualification requires the Q-suffix version (DDZ6V8BQ-7), which is AEC-Q101 qualified, PPAP capable, and manufactured in IATF16949-certified facilities. The "B" grade denotes tighter V_Z tolerance but does not imply automotive qualification.

How is polarity identified on the DDZ6V8B-7 package?

Polarity is marked by a cathode band - a visible molded stripe near one end of the SOD123 body. The banded end is the cathode and must be connected to the higher-potential node in reverse-bias operation. The opposite (unbanded) end is the anode, typically grounded or referenced to feedback circuitry.

Can DDZ6V8B-7 replace a 6.8 V Zener with 5% tolerance in an existing design?

Yes - but only if the existing design accommodates tighter regulation. DDZ6V8B-7's ±2.5% tolerance (6.49–6.83 V) falls entirely within the ±5% band (6.46–7.14 V) of typical 6.8 V Zeners. Its lower Z_ZT (5 Ω vs. ≥10 Ω) may improve transient response, though thermal layout must match its 425 °C/W rating on minimal pads.