Diodes Incorporated DDZ15S-7

Overview

DDZ15S-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 14.80–15.57 V at 10 mA test current, 18 Ω maximum zener impedance at 10 mA, and 0.05 µA maximum reverse leakage at 12.0 V. It uses SOD323 package, supports automated assembly, and delivers tight voltage tolerance for voltage reference and regulation in power supply feedback loops.

For engineers reviewing the DDZ15S-7 datasheet, DDZ15S-7 pinout, DDZ15S-7 application, or DDZ15S-7 equivalent, this part serves as a stable, low-leakage, RoHS-compliant 15 V reference in space-constrained DC-DC converter designs, analog sensor biasing, and overvoltage protection circuits where thermal stability and sharp breakdown are critical.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain a stable reference voltage across its terminals under controlled current conditions. Its 18 Ω dynamic impedance at 10 mA and ±0.5% typical voltage tolerance (14.80–15.57 V range) enable high-accuracy regulation in closed-loop feedback paths.

The device exhibits low temperature coefficient behavior in the 15 V range-approximately +0.06%/°C per Fig. 14-and is rated for continuous power dissipation of 200 mW at 25°C, derating linearly above 25°C per the published curve (625°C/W junction-to-ambient thermal resistance).

Key Specifications

Pinout & Package

SOD323 package: 2-terminal surface-mount plastic case with cathode band marking; dimensions: 1.30 mm (D) × 1.70 mm (E) × 0.30 mm (L); weight ≈ 0.004 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C15-7-F and MMSZ5245B-7-F, DDZ15S-7 offers tighter V_Z tolerance and lower Z_ZT in the smallest footprint (SOD323), making it optimal for high-density, high-accuracy 15 V reference designs where thermal and spatial constraints dominate.

Availability

DDZ15S-7 is available at Aetrix Electronics and suitable for DC-DC converter feedback, industrial sensor biasing, overvoltage clamp, and microcontroller reset circuits requiring stable component supply and consistent parametric performance across production lots.

Supply support for DDZ15S-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 the Americas.

The DDZ series targets precision voltage reference applications in compact power management systems, emphasizing tight tolerance, low leakage, and robust automated assembly compatibility for high-reliability consumer and industrial end equipment.

FAQ

What is the recommended series resistor value for DDZ15S-7 in a 24 V input shunt regulator?

For stable operation at 10 mA Zener current, use R_S = (24 V − 15.2 V) / 10 mA = 880 Ω (standard 1% value). This ensures minimum current remains >1 mA across worst-case input and load variations, maintaining regulation integrity per the datasheet's 0.5 mA minimum I_ZK specification.

Does DDZ15S-7 require heatsinking in typical PCB layouts?

No heatsink is required. At 200 mW maximum power dissipation and 625°C/W thermal resistance, junction temperature rise is ≤125°C above ambient at full rating-well within the −65°C to +150°C operating range. Standard FR-4 pads per Diodes' recommended layout suffice for thermal management.

How does the temperature coefficient of DDZ15S-7 affect long-term reference stability?

Per Fig. 14, DDZ15S-7 exhibits ~+0.06%/°C TC near 15 V. Over a 100°C ambient range (−40°C to +60°C), this contributes ±0.6% V_Z drift-less than its initial ±0.5% tolerance band. System-level calibration or compensation is typically unnecessary for most industrial applications.

Can DDZ15S-7 be used in place of a 1N4744A in existing designs?

No direct replacement: 1N4744A is a 14 V, 1 W axial-leaded Zener in DO-41 package. DDZ15S-7 is a 15 V, 200 mW SOD323 device with different thermal, mechanical, and electrical characteristics. Substitution requires redesign of bias network, PCB layout, and validation of power/thermal margins.