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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Diodes Incorporated DDZ9705S-7

Name: DDZ9705S-7
Brand: Diodes Incorporated
SKU: DDZ9705S-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDZ9705S-7

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: DDZ9705S-7.pdf

Description:: DIODE ZENER 18V 200MW SOD323

Quantity:: RFQ Add To RFQ list

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Inventory:33,380

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Product details

Overview

DDZ9705S-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal Zener voltage of 18 V, ±5% tolerance (17.1–18.9 V), 50 µA test current, and 0.05 µA maximum reverse leakage at 13.6 V. It features sharp breakdown characteristics, low thermal resistance (625 °C/W), and AEC-Q101 qualification for automotive-grade reliability. It serves as a stable voltage reference in power supply feedback loops and overvoltage protection circuits.

For engineers reviewing the DDZ9705S-7 datasheet, DDZ9705S-7 pinout, DDZ9705S-7 application, or DDZ9705S-7 equivalent, key selection criteria include Zener voltage tolerance, temperature coefficient (≈+0.07 %/°C at 18 V), low leakage, SOD-323 package compatibility, and AEC-Q101 qualification for harsh-environment designs.

Technical Context

This device operates in reverse-bias breakdown mode to maintain precise DC voltage regulation. Its sharp knee and tight V_Z tolerance are achieved via controlled diffusion and process optimization, enabling stable reference performance across temperature and current variations.

Thermal design relies on its 200 mW power rating on FR-4 PCB with recommended pad layout, and its junction-to-ambient thermal resistance of 625 °C/W directly governs allowable ambient operating temperature under load.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	18 V - Stable regulation point at I_ZT = 50 µA, used for precision biasing and feedback references
Zener Voltage Tolerance	±5% (17.1–18.9 V) - Enables high-accuracy voltage clamping without post-production trimming
Reverse Leakage Current	≤0.05 µA @ V_R = 13.6 V - Minimizes error current in high-impedance reference nodes
Power Dissipation	200 mW - Limits continuous Zener current to ~11 mA at 18 V in standard PCB layout
Thermal Resistance θ_JA	625 °C/W - Requires derating above 25°C ambient; full power only usable up to ~75°C ambient
Temperature Coefficient	+0.07 %/°C (typ.) - Predictable positive drift enables compensation in multi-diode references
Package	SOD-323 - 2-pin surface-mount footprint (1.2–1.4 mm width, 2.3–2.7 mm length) compatible with automated pick-and-place

Pinout & Package

Package: SOD-323 - ultra-small plastic case with cathode band marking; terminals are matte tin-plated Alloy 42 leads, solderable per MIL-STD-202.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference ground	Connected to circuit ground or lower-potential node; defines reference return path for Zener current
Cathode	Zener breakdown terminal / regulated output node	Connected to voltage source or feedback node; maintains 18 V relative to anode when reverse biased above V_Z

Key Features

Feature	Design Value
Very sharp breakdown knee	Enables clean transition into regulation with minimal voltage hysteresis during transient overvoltage events
AEC-Q101 qualified	Validated for automotive applications including engine control units and body electronics requiring extended temperature and reliability compliance
Low leakage (0.05 µA)	Preserves accuracy in high-resistance divider networks and battery-powered sensor references
Tight V_Z tolerance (±5%)	Reduces need for external calibration or binning in production test flows for voltage monitoring circuits
RoHS-compliant & "Green" molding compound	Meets environmental compliance requirements without compromising moisture sensitivity (Level 1 per J-STD-020)

Applications

Automotive Engine Control Unit (ECU) Reference

Industrial Power Supply Feedback Loop

Use Scenario: Provides stable 18 V reference for microcontroller ADC biasing and sensor signal conditioning in under-hood ECU modules.

IC Role / Device Role / Timing Role: Precision voltage reference diode establishing analog ground reference and scaling factor for analog front-end circuits.

Use Value: AEC-Q101 qualification ensures operation from −40°C to +125°C ambient; low leakage prevents ADC offset drift over time.

Use Scenario: Sets regulation threshold in isolated flyback converter feedback network using optocoupler-coupled TL431 replacement topology.

IC Role / Device Role / Timing Role: Zener reference element defining secondary-side output voltage setpoint in isolated DC-DC converters.

Use Value: Tight ±5% V_Z tolerance eliminates need for trim resistors; SOD-323 footprint supports compact board layout.

Medical Infusion Pump Voltage Monitor

Telecom Line Card Overvoltage Clamp

Use Scenario: Monitors battery pack voltage in portable infusion pumps, triggering shutdown if >18.5 V to prevent Li-ion overcharge.

IC Role / Device Role / Timing Role: Reverse-biased Zener acting as analog comparator input clamp and threshold detector in discrete protection circuitry.

Use Value: Sharp breakdown ensures consistent trip point across temperature; low leakage avoids false triggers in high-impedance sense paths.

Use Scenario: Clamps transients on 24 V telecom line cards to protect downstream PHY ICs from ESD and lightning-induced surges.

IC Role / Device Role / Timing Role: Fast-response shunt protector diverting surge energy to ground before voltage exceeds 18.9 V peak.

Use Value: 200 mW power rating handles short-duration surges; SOD-323 allows placement near connector entry points.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C18LT1G	Same 18 V nominal, ±5% tolerance, but rated for 300 mW and uses SOT-23 package	Larger footprint and higher power allow higher surge handling; less suitable for ultra-dense layouts	Select when higher pulse power margin is required and board space permits SOT-23
MMSZ5245B-TP	18 V nominal, ±5%, but specified at I_ZT = 20 mA (vs. 50 µA); higher dynamic impedance (~25 Ω vs. ~15 Ω)	Designed for higher-current regulation; less accurate at microamp-level bias currents	Select for general-purpose 18 V clamping where low-leakage precision is not critical

Compared with BZX84-C18LT1G and MMSZ5245B-TP, DDZ9705S-7 offers superior low-current regulation stability (50 µA test point), tighter thermal coefficient tracking, and automotive qualification-making it optimal for space-constrained, high-reliability reference designs.

Availability

DDZ9705S-7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial power supply feedback networks, medical battery monitors, and telecom line card protection requiring stable component supply and long-term lifecycle support.

Supply support for DDZ9705S-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, specializing in high-reliability, application-optimized components for automotive, industrial, and computing markets.

The DDZ9689S–DDZ9717S series belongs to Diodes' precision Zener diode product line, engineered specifically for stable voltage referencing in space-constrained, thermally demanding environments where AEC-Q101 compliance and low leakage are mandatory.

FAQ

What is the maximum reverse voltage (V_R) at which leakage remains ≤0.05 µA?

The DDZ9705S-7 guarantees ≤0.05 µA reverse leakage at V_R = 13.6 V, per the Electrical Characteristics table. This value is specified as the maximum reverse voltage applied during leakage testing-not the absolute breakdown threshold-and reflects the device's ability to hold off voltage below nominal Zener level with negligible current.

Is the SOD-323 package compatible with reflow soldering per J-STD-020?

Yes-the DDZ9705S-7's SOD-323 package is rated Moisture Sensitivity Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH and is fully compatible with standard lead-free reflow profiles without baking. Its matte tin finish ensures reliable wetting and joint integrity.

How does the temperature coefficient affect regulation accuracy over −40°C to +125°C?

At 18 V, the typical temperature coefficient is +0.07 %/°C. Over a 165°C range, this yields ≈±1.16% total drift (0.07 × 165), translating to ±0.21 V variation around 18 V. This is within the ±5% initial tolerance and suitable for non-critical reference applications; tighter systems require compensation or dual-Zener configurations.

Can DDZ9705S-7 replace a 1N4746A in existing designs?

No-DDZ9705S-7 (18 V, SOD-323, 200 mW) is not a drop-in replacement for 1N4746A (18 V, DO-41, 1 W). The power rating, package size, thermal behavior, and mounting method differ significantly. Redesign of PCB layout, thermal relief, and current-limiting resistor values would be required to ensure safe operation.

DDZ9705S-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SC-76, SOD-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 18 V

Tolerance:: ±5%

Power - Max:: 200 mW

Impedance (Max) (Zzt):: -

Current - Reverse Leakage @ Vr:: 50 nA @ 13.6 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-323

DDZ9705S-7 FAQ

1.How can I place an order for DDZ9705S-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DDZ9705S-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for DDZ9705S-7 reliable?

The price and inventory of DDZ9705S-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ9705S-7 is usually 5 days.

3.What payment methods are accepted for DDZ9705S-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ9705S-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDZ9705S-7?

DDZ9705S-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDZ9705S-7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for DDZ9705S-7?

For technical support, including DDZ9705S-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ9705S-7 requirements.

6.How does Aetrix verify that DDZ9705S-7 is sourced from the original manufacturer or authorized distributors?

All DDZ9705S-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DDZ9705S-7 meets industry standards.

7.What is the process for return or replacement of DDZ9705S-7?

All DDZ9705S-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ9705S-7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The DDZ9705S-7 part is unused and in its original packaging.

Return procedure for DDZ9705S-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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