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Diodes Incorporated DDZ20CSF-7
- Part No.:
- DDZ20CSF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ20CSF-7.pdf
- Description:
- DIODE ZENER 19.73V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:7,796
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Product details
Overview
DDZ20CSF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage of 19.23–20.22 V at 10 mA test current, 50 Ω maximum zener impedance, and ±0.07 µA reverse leakage at 17.7 V. It operates across –65°C to +150°C and is used for voltage regulation and reference in power supply feedback loops, analog sensor biasing, and overvoltage protection circuits.
For engineers reviewing the DDZ20CSF-7 datasheet, DDZ20CSF-7 pinout, DDZ20CSF-7 application, or DDZ20CSF-7 equivalent, this part is selected for stable low-power voltage reference where tight VZ tolerance (±2.6%), low thermal drift, and SOD323F package compatibility with high-density PCB layouts are required.
Technical Context
This Zener diode employs silicon planar epitaxial construction to achieve precise breakdown characteristics with minimal temperature coefficient variation - typical TC near +4.5 mV/°C for 20 V-class devices per Figure 3. Its design targets DC voltage stabilization under low-current conditions (IZT = 10 mA), not transient clamping.
The device exhibits a forward voltage of 0.9 V at 10 mA and thermal resistance of 250°C/W on FR-4 PCB with 10 mm × 10 mm copper pad. Power derating begins linearly above +25°C ambient, reaching zero dissipation at +150°C per Figure 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.23–20.22 V @ IZT = 10 mA - defines stable regulation point for feedback networks |
| Zener Impedance (ZZT) | ≤50 Ω @ 1 kHz - ensures minimal output voltage shift under load transients |
| Reverse Leakage (IR) | ≤0.07 µA @ VR = 17.7 V - guarantees negligible error current in high-impedance reference paths |
| Power Dissipation (PD) | 500 mW on FR-4 - supports continuous operation in compact power management stages |
| Thermal Resistance (RθJA) | 250°C/W - determines junction temperature rise under given PCB layout and airflow |
| Operating Temperature | –65°C to +150°C - enables use in automotive engine control units and industrial motor drives |
Pinout & Package
Package: SOD323F - ultra-small plastic surface-mount package (2.50 mm × 1.25 mm × 0.95 mm) with matte tin-plated copper alloy leadframe, moisture sensitivity level 1, and UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias | Connected to lower-potential node in regulation circuit; requires no special routing |
| Cathode | Current exit terminal during reverse breakdown | Marked by cathode band; ties to regulated output node or error amplifier input |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±2.6% (19.23–20.22 V range) - reduces need for external trimming in voltage references |
| Low dynamic impedance | ≤50 Ω at 1 kHz - maintains regulation accuracy under varying load currents |
| High-temperature operation | Rated to +150°C junction - supports under-hood automotive and industrial power modules |
| Lead-free & halogen-free | RoHS 3 compliant, <900 ppm Br/Cl, <1000 ppm Sb - meets global environmental compliance mandates |
| Automated assembly compatibility | SOD323F footprint with J-STD-020 Level 1 moisture sensitivity - eliminates bake requirements pre-reflow |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference sets error amplifier threshold; replaces TL431 in cost-sensitive designs. Use Value: Tight VZ tolerance minimizes output voltage deviation across line/load/temperature; low IR avoids loading of high-impedance divider. |
Use Scenario: Provides stable bias voltage for bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Precision reference for ratiometric ADC excitation; placed directly at sensor interface. Use Value: Low thermal drift ensures measurement stability over –40°C to +85°C operating range; SOD323F enables placement adjacent to sensor IC. |
| Overvoltage Protection Clamp | Microcontroller Reset Circuit |
Use Scenario: Clamps 24 V rail surges in PLC I/O modules to protect downstream logic. IC Role / Device Role / Timing Role: Shunt clamp activated only during overvoltage events; operates in reverse breakdown. Use Value: 500 mW rating handles short-duration transients without thermal runaway; fast response limits voltage overshoot. |
Use Scenario: Generates clean reset signal for ARM Cortex-M microcontrollers during brown-out conditions. IC Role / Device Role / Timing Role: Reference element in RC-reset timing network; triggers reset when VCC drops below threshold. Use Value: Stable 20 V breakdown enables accurate reset voltage setting with external resistor divider; low leakage prevents premature discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20LT1G | 20 V nominal, ±5% tolerance, 350 mW, SOT-23 package, 60 Ω ZZT | Higher power dissipation margin but looser VZ tolerance and larger footprint | Select when board space allows SOT-23 and ±5% regulation accuracy is acceptable |
| MMSZ5248B-TP | 20 V nominal, ±5% tolerance, 500 mW, SOD-123 package, 30 Ω ZZT | Same power rating but wider package (SOD-123 vs SOD323F); slightly lower impedance | Choose when existing layout uses SOD-123 footprints and tighter ZZT is prioritized over size |
Compared with DDZ20CSF-7, BZX84-C20LT1G trades voltage precision for higher surge handling in larger packages, while MMSZ5248B-TP offers comparable power but less stringent VZ control in a physically larger form factor - making DDZ20CSF-7 optimal for space-constrained, high-accuracy reference designs.
Availability
DDZ20CSF-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, overvoltage protection circuits, and microcontroller reset networks requiring stable component supply and long-term manufacturability.
Supply support for DDZ20CSF-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 North America.
This part belongs to the DDZ series of precision Zener diodes engineered for high-stability voltage reference and regulation in automotive, industrial, and computing power systems - emphasizing tight tolerance, low leakage, and extended temperature capability.
FAQ
What is the maximum allowable power dissipation for DDZ20CSF-7 at 85°C ambient?
Per the power derating curve (Figure 1), DDZ20CSF-7 maintains 500 mW dissipation up to +25°C ambient. Above that, it derates linearly at 4 mW/°C. At +85°C ambient, allowable power is 500 mW − (60°C × 4 mW/°C) = 260 mW. This assumes mounting on FR-4 with specified 10 mm × 10 mm copper pad per datasheet Note 5.
Does DDZ20CSF-7 meet AEC-Q101 qualification for automotive use?
No - DDZ20CSF-7 is not AEC-Q101 qualified. The datasheet explicitly states that automotive-grade versions require specific change control, PPAP capability, and IATF 16949 manufacturing; those parts carry distinct orderable numbers and are separately qualified. DDZ20CSF-7 is intended for industrial and commercial applications.
Can DDZ20CSF-7 be used as a replacement for TL431 in shunt regulator circuits?
It can serve as a basic two-terminal alternative in simple shunt configurations, but lacks the TL431's adjustable reference, high gain, and sink current capability. DDZ20CSF-7 provides fixed 20 V regulation with passive behavior only - suitable for non-critical biasing or clamping, not closed-loop feedback requiring error amplification.
What is the significance of the "CSF" suffix in DDZ20CSF-7?
The "CSF" suffix denotes the third voltage grade within the 20 V family: "C" indicates ±2.6% tolerance (19.23–20.22 V), "S" specifies SOD323F package, and "F" confirms RoHS-compliant, halogen-free green molding compound. The "-7" suffix indicates 3,000-piece tape-and-reel packaging.
DDZ20CSF-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 19.73 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 50 Ohms
- Current - Reverse Leakage @ Vr:
- 70 nA @ 17.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
DDZ20CSF-7 FAQ
1.How can I place an order for DDZ20CSF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ20CSF-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 DDZ20CSF-7 reliable?
The price and inventory of DDZ20CSF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ20CSF-7 is usually 5 days.
3.What payment methods are accepted for DDZ20CSF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ20CSF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ20CSF-7?
DDZ20CSF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ20CSF-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 DDZ20CSF-7?
For technical support, including DDZ20CSF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ20CSF-7 requirements.
6.How does Aetrix verify that DDZ20CSF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ20CSF-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 DDZ20CSF-7 meets industry standards.
7.What is the process for return or replacement of DDZ20CSF-7?
All DDZ20CSF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ20CSF-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 DDZ20CSF-7 part is unused and in its original packaging.
Return procedure for DDZ20CSF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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