Diodes Incorporated DDZ12CS-7

Overview

DDZ12CS-7 from Diodes Incorporated is a surface-mount precision Zener diode in SOD323 package, designed for voltage regulation and reference applications with nominal Zener voltage of 11.74 V to 12.35 V at 10 mA test current, 12 Ω typical Zener impedance at 10 mA, and maximum reverse leakage of 0.1 µA at 9.1 V. It operates across –65 °C to +150 °C and delivers stable reference performance in low-power analog circuits.

For engineers reviewing the DDZ12CS-7 datasheet, DDZ12CS-7 pinout, DDZ12CS-7 application, or DDZ12CS-7 equivalent, this part serves as a high-stability, low-leakage voltage reference in power supply feedback loops, sensor biasing networks, and overvoltage protection circuits where tight V_Z tolerance and low thermal drift are critical.

Technical Context

This Zener diode operates in reverse breakdown mode with sharp knee characteristics and tightly controlled voltage distribution (±2.6% total tolerance). Its 12 Ω dynamic impedance at I_ZT = 10 mA ensures minimal output variation under load changes, while the 0.1 µA reverse leakage at V_R = 9.1 V supports ultra-low quiescent current designs.

The device uses an alloy-42 leadframe with matte tin annealed terminals, rated for 200 mW power dissipation on FR-4 PCBs and exhibiting 625 °C/W junction-to-ambient thermal resistance. Its SOD323 package enables automated placement and reflow compatibility per J-STD-020 Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

DDZ12CS-7 is a two-terminal Zener diode housed in a SOD323 plastic package with cathode band marking. The anode and cathode terminals are accessed via the two leads extending from opposite ends of the molded body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C12LT1G and MMSZ4687T1G, DDZ12CS-7 offers tighter voltage tolerance (±2.6% vs. ±5%), lower dynamic impedance (12 Ω vs. ≥25 Ω), and significantly lower leakage (0.1 µA vs. ≥1 µA), making it superior for precision regulation and battery-sensitive applications.

Availability

DDZ12CS-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, overvoltage protection circuits, and microcontroller reset networks requiring stable component supply and long-term manufacturability.

Supply support for DDZ12CS-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 across Asia, Europe, and North America.

DDZ12CS-7 belongs to the DDZxxS series of precision Zener diodes, engineered specifically for high-accuracy voltage reference and regulation in space-constrained, high-reliability applications such as industrial automation and automotive subsystems.

FAQ

What is the recommended current-limiting resistor value for DDZ12CS-7 in a 15 V supply application?

For stable operation at I_ZT = 10 mA, a 270 Ω resistor yields ~11.2 mA current (V_IN − V_Z) / R = (15 V − 12.05 V) / 270 Ω. This maintains regulation within the specified 10 mA test point while staying well below the 200 mW power limit and ensuring adequate thermal margin on standard FR-4 PCBs.

Does DDZ12CS-7 require heatsinking in typical PCB layouts?

No heatsink is required. With 625 °C/W junction-to-ambient thermal resistance and 200 mW maximum power dissipation, the junction temperature rise remains below 125 °C even at full power on a standard FR-4 board with recommended pad layout. Derating begins above 70 °C ambient per Figure 1 in DS30414.

Can DDZ12CS-7 be used in place of a 12 V Zener with ±5% tolerance?

Yes, but only where tighter regulation improves performance. Its ±2.6% tolerance (11.74–12.35 V) provides narrower voltage spread than ±5% parts (11.4–12.6 V), reducing output variation in feedback loops and improving accuracy in reference-dependent measurements without circuit redesign.

Is the SOD323 package of DDZ12CS-7 compatible with standard reflow profiles?

Yes. As a J-STD-020 Level 1 moisture-sensitive device, DDZ12CS-7 supports standard Pb-free reflow profiles (peak 260 °C, 30 sec max) without baking. Its matte tin annealed terminals meet MIL-STD-202 Method 208 solderability requirements and exhibit no dewetting or voiding on properly designed pads.