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Diodes Incorporated DDZ9709S-7
- Part No.:
- DDZ9709S-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
DDZ9709S-7.pdf
- Description:
- DIODE ZENER 24V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
DDZ9709S-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal Zener voltage of 24 V, ±2.1 V tolerance (22.8–25.2 V), 50 µA maximum reverse leakage at 18.2 V, 200 mW power dissipation, and SOD-323 package. It delivers sharp breakdown characteristics and low temperature coefficient for voltage reference and regulation in power supply feedback paths.
For engineers reviewing the DDZ9709S-7 datasheet, DDZ9709S-7 pinout, DDZ9709S-7 application, or DDZ9709S-7 equivalent, key selection criteria include Zener voltage accuracy, thermal stability, low leakage at rated VR, SOD-323 footprint compatibility, and RoHS-compliant lead-free construction.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across varying load currents via controlled reverse-biased Zener breakdown. Its 24 V nominal rating targets mid-range reference applications where higher-voltage stability is required without series regulator complexity.
The SOD-323 package enables high-density PCB layouts and automated placement, while its 625 °C/W junction-to-ambient thermal resistance requires attention to pad layout per Diodes' AP02001 guidelines to sustain full 200 mW dissipation at 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V nominal, 22.8–25.2 V range at IZT = 5 mA - defines precise regulation point for feedback networks |
| Power Dissipation (PD) | 200 mW - limits maximum continuous Zener current to ~8.3 mA at 24 V in still air |
| Reverse Leakage (IR) | ≤50 µA at VR = 18.2 V - ensures minimal error current in high-impedance reference nodes |
| Zener Impedance (ZZT) | ~35 Ω typical at IZT = 5 mA (Fig. 14) - determines AC regulation sensitivity to load transients |
| Temperature Coefficient | +0.07 %/°C typical (Fig. 19) - yields ~±0.17 V drift over –40 to +85 °C operating range |
| Package | SOD-323 - 2.3–2.7 mm length, 1.2–1.4 mm width, 0.25–0.35 mm thickness - compatible with 0805-class pick-and-place |
Pinout & Package
Two-terminal device in SOD-323 package: Cathode marked by band on top surface; anode and cathode are the only terminals. Mounting polarity must be observed to ensure proper reverse-bias operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or lower-potential rail; forms return path for Zener current |
| Cathode | Regulated voltage node | Provides stable 24 V output when reverse-biased; connects to feedback divider or load |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp breakdown characteristics | Low dynamic impedance (~35 Ω) ensures tight voltage regulation under varying current loads |
| Tight VZ tolerance | ±2.1 V (±8.75%) at 24 V enables accurate setpoint control without post-calibration |
| Low leakage current | ≤50 µA at 18.2 V minimizes error in high-resistance voltage dividers and sensing circuits |
| RoHS-compliant & "Green" construction | Matte tin finish on Alloy 42 leadframe and halogen-free molding compound meet industrial environmental mandates |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Excitation |
|---|---|
Use Scenario: Provides precise 24 V reference for optocoupler-based feedback loop in 48 V input DC-DC converters. IC Role / Device Role / Timing Role: Shunt voltage reference regulating error amplifier input voltage. Use Value: Enables ±1% output regulation accuracy despite line/load variations and temperature drift. | Use Scenario: Supplies stable excitation voltage to 4–20 mA current-loop pressure transducers in factory automation. IC Role / Device Role / Timing Role: Two-terminal passive reference source replacing active regulators in space-constrained modules. Use Value: Eliminates quiescent current overhead and simplifies BOM with single-component solution. |
| Programmable Logic Controller I/O Protection | Test Equipment Voltage Calibration |
Use Scenario: Clamps transient overvoltage on 24 V digital input channels during ESD events or inductive switching. IC Role / Device Role / Timing Role: Precision crowbar element limiting input voltage to safe logic levels. Use Value: Maintains clamping accuracy within ±0.5 V over temperature, preventing false triggering. | Use Scenario: Serves as traceable 24 V reference standard in benchtop multimeter calibration fixtures. IC Role / Device Role / Timing Role: Stable, low-drift voltage source for null-comparison measurements. Use Value: Delivers <±0.02 %/°C TC performance enabling 0.1% calibration confidence over lab temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C24LT1G | Same 24 V nominal, but ±5% tolerance (22.8–25.2 V), 350 mW PD, SOT-23 package | Larger footprint; higher power allows greater current margin but requires different layout | Select when higher power headroom or legacy SOT-23 tooling is prioritized over miniaturization |
| MMSZ4686T1G | 24 V nominal, ±5% tolerance, 500 mW PD, SOD-123 package | Higher thermal resistance (833 °C/W); less stable regulation under self-heating | Choose only for cost-sensitive, non-critical references where size is secondary to unit price |
Compared with BZX84-C24LT1G and MMSZ4686T1G, DDZ9709S-7 offers tighter voltage tolerance in the smallest footprint (SOD-323), optimized for space-constrained, high-accuracy feedback and sensing - not raw power handling.
Availability
DDZ9709S-7 is available at Aetrix Electronics and suitable for switch-mode power supply feedback, industrial sensor excitation, PLC I/O protection, and test equipment voltage calibration requiring stable component supply and consistent parametric performance across production lots.
Supply support for DDZ9709S-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 power management, signal integrity, and protection.
The DDZ9689S–DDZ9717S series was designed specifically for precision voltage reference and regulation in compact, automated-assembly environments - emphasizing tight VZ tolerance, low leakage, and green packaging compliance.
FAQ
What is the maximum Zener test current (IZT) for DDZ9709S-7?
The datasheet specifies IZT = 5 mA for all devices in the DDZ9689S–DDZ9717S family, including DDZ9709S-7. This current is used to measure nominal VZ and Zener impedance under standardized thermal conditions (junction at 30 °C ±1 °C).
Does DDZ9709S-7 have AEC-Q101 qualification?
No - DDZ9709S-7 is not AEC-Q101 qualified. Only DDZ9705S (marked with Note 5 in the Electrical Characteristics table) carries AEC-Q101 qualification. DDZ9709S-7 is intended for industrial and commercial applications, not automotive.
Can DDZ9709S-7 be used in parallel for higher power dissipation?
No - Zener diodes should not be paralleled due to mismatched breakdown voltages causing current hogging. For higher power, use a single higher-rated device (e.g., SOD-123 or SMA packages) or add an external series pass transistor.
What is the recommended PCB pad layout for optimal thermal performance?
Diodes Incorporated recommends the pad layout in Application Note AP02001, featuring 0.8 mm × 0.8 mm copper pads with thermal relief traces. This layout achieves the specified 625 °C/W RθJA; reducing pad area increases thermal resistance and derates power capability.
DDZ9709S-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):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.2 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
DDZ9709S-7 FAQ
1.How can I place an order for DDZ9709S-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ9709S-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 DDZ9709S-7 reliable?
The price and inventory of DDZ9709S-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ9709S-7 is usually 5 days.
3.What payment methods are accepted for DDZ9709S-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ9709S-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ9709S-7?
DDZ9709S-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ9709S-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 DDZ9709S-7?
For technical support, including DDZ9709S-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ9709S-7 requirements.
6.How does Aetrix verify that DDZ9709S-7 is sourced from the original manufacturer or authorized distributors?
All DDZ9709S-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 DDZ9709S-7 meets industry standards.
7.What is the process for return or replacement of DDZ9709S-7?
All DDZ9709S-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ9709S-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 DDZ9709S-7 part is unused and in its original packaging.
Return procedure for DDZ9709S-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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