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Diodes Incorporated DDZ9708S-7
- Part No.:
- DDZ9708S-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
DDZ9708S-7.pdf
- Description:
- DIODE ZENER 22V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,055
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Product details
Overview
DDZ9708S-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal Zener voltage 22 V, ±5% tolerance (20.9–23.1 V), 50 µA maximum reverse leakage at 16.7 V, 200 mW power dissipation, and SOD-323 package. It provides stable voltage reference in low-power analog circuits, voltage regulation for sensor biasing, and overvoltage protection in portable instrumentation.
For engineers reviewing the DDZ9708S-7 datasheet, DDZ9708S-7 pinout, DDZ9708S-7 application, or DDZ9708S-7 equivalent, key selection criteria include Zener voltage accuracy, low leakage at rated VR, thermal resistance (625 °C/W), RoHS-compliant "Green" construction, and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable reverse-biased breakdown voltage across its cathode–anode terminals under controlled current conditions (IZT = 5 mA). Its sharp knee breakdown and tight VZ tolerance enable high-accuracy reference generation without external trimming.
Designed for thermal stability in compact layouts, it exhibits a temperature coefficient of approximately +0.07 %/°C near 22 V (per Fig. 18), and its 0.004 g mass and SOD-323 footprint support space-constrained designs where minimal parasitic capacitance (<2 pF at 1 MHz) is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 22 V - Stable reference point for 20–24 V system rails |
| VZ Tolerance | ±5% (20.9–23.1 V) - Enables single-bin sorting without calibration |
| Test Current (IZT) | 5 mA - Standard operating point for specified VZ and impedance |
| Max Reverse Leakage (IR) | 0.05 µA @ VR = 16.7 V - Ensures minimal error current in high-impedance reference nodes |
| Power Dissipation | 200 mW - Supports continuous operation up to 9.1 mA at 22 V with derating above 25°C |
| Thermal Resistance | 625 °C/W - Requires careful pad layout per AP02001 for safe ambient operation |
| Capacitance | ~1.8 pF @ 1 MHz, VR = 2 V - Low enough for use in RF bias networks and fast transient detection |
Pinout & Package
Package: SOD-323 - ultra-small plastic surface-mount case (2.3–2.7 mm length × 1.2–1.4 mm width × 0.25–0.35 mm height), cathode marked by band, matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during forward conduction; reference ground node in shunt regulator | Connected to system GND or lowest potential node; defines polarity for Zener operation |
| Cathode | Current source during reverse breakdown; regulated output node | Connected to input rail or feedback node; voltage at this terminal is stabilized at VZ |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp breakdown knee | Enables precise threshold detection with <100 mV transition width at 1–10 mA |
| Tight VZ tolerance (±5%) | Eliminates need for post-assembly trimming in production-grade voltage references |
| Low leakage (0.05 µA) | Minimizes loading error in high-Z op-amp reference buffers and battery-monitoring dividers |
| RoHS-compliant & "Green" | Meets environmental compliance without sacrificing solderability or long-term reliability |
| Suitable for automated assembly | Standard SOD-323 footprint and marking support high-yield pick-and-place and AOI inspection |
Applications
| Portable Sensor Signal Conditioning | Industrial Analog Input Protection |
|---|---|
Use Scenario: Biasing bridge sensors and powering low-current op-amps in handheld gas detectors. IC Role / Device Role / Timing Role: Precision voltage reference for ADC front-end gain-setting and excitation. Use Value: 22 V nominal output enables direct use with 24 V industrial supplies while maintaining <0.5% total error over temperature. | Use Scenario: Clamping analog input channels against ESD and transients in PLC I/O modules. IC Role / Device Role / Timing Role: Shunt overvoltage protector placed before precision amplifier inputs. Use Value: Sub-2 pF capacitance avoids signal integrity degradation at 100 kHz bandwidth; 0.05 µA leakage prevents DC offset drift. |
| Low-Power Battery Monitoring | Programmable Power Supply Reference |
Use Scenario: Monitoring 24 V LiFePO₄ battery packs in solar charge controllers. IC Role / Device Role / Timing Role: Stable reference for comparator-based state-of-charge thresholds. Use Value: Tight ±5% VZ ensures consistent trip points across production units without calibration. | Use Scenario: Setting output voltage in digitally adjustable lab power supplies using DAC-controlled feedback. IC Role / Device Role / Timing Role: Secondary reference stabilizing DAC output against supply ripple. Use Value: 625 °C/W θJA allows stable operation on minimal copper area, reducing board cost and size. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C22LT1G | Same 22 V nominal, ±5% tolerance, but higher IR (100 nA @ 17.6 V) and 350 mW PD | Higher power handling supports higher current reference sinks; less suitable for ultra-low-leakage nodes | Select when >5 mA load current or higher ambient temperatures require extra margin |
| MMSZ4686-TP | 22.1 V nominal, ±5%, lower PD (500 mW), SOD-123 package (larger footprint) | Larger case improves thermal performance but occupies ~2.5× more board area than SOD-323 | Select when thermal derating is critical and board space permits larger package |
Compared with BZX84-C22LT1G and MMSZ4686-TP, DDZ9708S-7 offers the smallest footprint and lowest leakage among 22 V Zeners, making it optimal for space- and power-constrained analog subsystems where reference stability dominates over raw power capability.
Availability
DDZ9708S-7 is available at Aetrix Electronics and suitable for portable instrumentation, industrial analog I/O protection, and battery management systems requiring stable component supply with full traceability and no obsolescence risk.
Supply support for DDZ9708S-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 and manufacturing operations across Asia and the Americas.
The DDZ9xxxS series belongs to Diodes' precision Zener diode product line, engineered specifically for high-accuracy voltage referencing in space-constrained, low-power applications where tight tolerance, low leakage, and automated assembly compatibility are mandatory.
FAQ
What is the recommended PCB pad layout for DDZ9708S-7?
The official recommended pad layout is documented in Diodes Application Note AP02001. It specifies copper land patterns optimized for thermal dissipation and solder joint reliability on FR-4 boards, including minimum solder mask clearance and thermal relief design for the anode and cathode pads to manage 625 °C/W junction-to-ambient resistance.
Does DDZ9708S-7 meet AEC-Q101 qualification?
No - DDZ9708S-7 is not AEC-Q101 qualified. While DDZ9705S is explicitly noted as AEC-Q101 qualified in the datasheet, DDZ9708S-7 appears only in the standard electrical characteristics table without automotive qualification notation or test summary.
What is the typical Zener impedance at 5 mA for DDZ9708S-7?
Based on Figure 14 (Typical Zener Impedance Characteristics, DDZ9705S–DDZ9709S), the dynamic impedance at 5 mA is approximately 45 Ω for the 22 V part. This value reflects small-signal AC resistance and directly impacts reference stability under varying load currents.
Can DDZ9708S-7 be used in series for higher voltage references?
Yes - multiple DDZ9708S-7 devices may be connected in series to achieve higher reference voltages (e.g., two in series yield ~44 V), but total leakage doubles and thermal coupling must be managed. The datasheet does not specify matched-pair characteristics, so tolerance stacks to ±7.1% for two units.
DDZ9708S-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):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.7 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
DDZ9708S-7 FAQ
1.How can I place an order for DDZ9708S-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ9708S-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 DDZ9708S-7 reliable?
The price and inventory of DDZ9708S-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ9708S-7 is usually 5 days.
3.What payment methods are accepted for DDZ9708S-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ9708S-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ9708S-7?
DDZ9708S-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ9708S-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 DDZ9708S-7?
For technical support, including DDZ9708S-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ9708S-7 requirements.
6.How does Aetrix verify that DDZ9708S-7 is sourced from the original manufacturer or authorized distributors?
All DDZ9708S-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 DDZ9708S-7 meets industry standards.
7.What is the process for return or replacement of DDZ9708S-7?
All DDZ9708S-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ9708S-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 DDZ9708S-7 part is unused and in its original packaging.
Return procedure for DDZ9708S-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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