Diodes Incorporated DDZ22BSF-7

Overview

DDZ22BSF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage 21.18 V (min 20.64 V, max 21.71 V) at 5 mA test current, 55 Ω dynamic impedance, and ±5% tolerance. It provides stable voltage reference in low-power analog circuits, power supply feedback loops, and overvoltage protection for microcontroller I/O pins on FR-4 PCBs.

For engineers reviewing the DDZ22BSF-7 datasheet, DDZ22BSF-7 pinout, DDZ22BSF-7 application, or DDZ22BSF-7 equivalent, this part is selected for tight-voltage-reference designs requiring <0.07 µA reverse leakage at 19.6 V, SOD323F footprint compatibility, and AEC-Q200-aligned manufacturing in IATF 16949 facilities.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its terminals under varying load and temperature conditions. Its 55 Ω zener impedance at 5 mA ensures minimal voltage deviation with current fluctuations, while the -65°C to +150°C operating range supports industrial and automotive ambient environments.

The device uses a planar epitaxial construction with cathode band marking and matte tin–annealed copper alloy leadframe for reliable solderability. Thermal resistance of 250°C/W (on 10 mm × 10 mm FR-4 pad) defines its derating behavior above 25°C ambient, per Figure 1 in DS31987 Rev. 23-2.

Key Specifications

Pinout & Package

Package: SOD323F - molded plastic, halogen- and antimony-free "Green" compound, UL 94V-0 rated, moisture sensitivity level 1 per J-STD-020, 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-C22LT1G and MMSZ5246B-TP, DDZ22BSF-7 offers superior thermal performance (250°C/W vs. ≥350°C/W), tighter leakage control (0.07 µA vs. 0.1 µA), and explicit support for automotive change control-making it optimal for high-reliability, thermally constrained, or AEC-aligned designs.

Availability

DDZ22BSF-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control modules, medical battery monitoring, and telecom DC-DC converter feedback requiring stable component supply and long-lifecycle support.

Supply support for DDZ22BSF-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 automotive, industrial, and medical systems, emphasizing tight tolerance, low leakage, and manufacturability in automated SMT lines.

FAQ

What is the maximum continuous reverse voltage that can be safely applied to DDZ22BSF-7 without exceeding its power rating?

The absolute maximum reverse voltage is defined by its 500 mW power limit and 55 Ω dynamic impedance. At 25°C ambient on FR-4, applying 21.71 V at 5 mA yields 108.55 mW - well within rating. Sustained operation above 21.71 V requires current limiting to maintain P_D ≤ 500 mW, e.g., ≤23.2 mA at 21.71 V. Derating applies above 25°C per Figure 1.

Does DDZ22BSF-7 have an officially qualified AEC-Q200 grade?

No AEC-Q200 qualification is stated in DS31987 Rev. 23-2. However, Diodes specifies that parts qualified to AEC-Q200 - with PPAP capability and IATF 16949 manufacturing - are available upon request. DDZ22BSF-7 is produced in IATF 16949-certified facilities and supports automotive change control processes, making it suitable for AEC-aligned development paths.

How does the SOD323F package compare to SOD-123 in thermal performance for DDZ22BSF-7?

DDZ22BSF-7 in SOD323F has R_θJA = 250°C/W on a 10 mm × 10 mm FR-4 pad, whereas typical SOD-123 Zeners (e.g., MMSZ5246B) exhibit ~300–350°C/W. The SOD323F's smaller footprint is offset by optimized thermal pad layout and thinner mold compound, yielding ~15–20% better junction-to-ambient conduction for equivalent board area.

Can DDZ22BSF-7 be used in series to achieve higher reference voltages?

Yes - two DDZ22BSF-7 devices in series yield ~42.4 V nominal with matched 5 mA test current. However, total dynamic impedance rises to ~110 Ω, and voltage matching tolerance becomes ±7.1% (root-sum-square of ±5%). For >30 V references, parallel Zener arrays or dedicated IC references are preferred for stability and temperature tracking.