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Diodes Incorporated DDZ18CSF-7
- Part No.:
- DDZ18CSF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ18CSF-7.pdf
- Description:
- DIODE ZENER 17.88V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:8,374
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Product details
Overview
DDZ18CSF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage of 17.42–18.33 V at 10 mA test current, ±5% tolerance, 45 Ω dynamic impedance at 1 kHz, and 0.07 µA reverse leakage at 16.5 V. It serves as a stable voltage reference in power supply feedback loops, overvoltage protection clamps, and analog signal conditioning circuits.
For engineers reviewing the DDZ18CSF-7 datasheet, DDZ18CSF-7 pinout, DDZ18CSF-7 application, or DDZ18CSF-7 equivalent, this part is selected for high-accuracy DC voltage regulation where thermal stability (TC ≈ +5.5 mV/°C), low leakage, and SOD323F package compatibility with automated assembly are critical design requirements.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled VZ distribution across production lots, validated per AEC-Q101 stress testing protocols. Its 250 °C/W junction-to-ambient thermal resistance assumes mounting on FR-4 PCB with 10 mm × 10 mm copper pad.
The device exhibits a positive temperature coefficient (~+5.5 mV/°C) typical for 18 V-class Zeners, enabling predictable drift compensation in reference designs. Reverse leakage remains ≤0.07 µA up to 16.5 V, supporting low-power standby circuit integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.42–18.33 V @ IZT = 10 mA - defines regulated output voltage range under standard test conditions |
| Power Dissipation | 500 mW - maximum continuous power on FR-4 board with specified pad layout |
| Zener Impedance (ZZT) | 45 Ω @ f = 1 kHz - indicates regulation stiffness against load transients |
| Reverse Leakage (IR) | ≤0.07 µA @ VR = 16.5 V - ensures minimal quiescent current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 250 °C/W - determines junction temperature rise above ambient under full power |
| Package | SOD323F - ultra-small 2-pin surface-mount outline with cathode band marking |
| Operating Temperature | −65 to +150 °C - supports industrial and automotive under-hood environments |
Pinout & Package
Package: SOD323F - molded plastic case with matte tin–annealed copper alloy leadframe, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated rail; forms reference ground return path |
| Cathode | Zener breakdown terminal / voltage regulation output | Connected to higher-potential side; delivers stable VZ when reverse biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage regulation | ±5% VZ tolerance enables <±0.9 V absolute error in 18 V reference applications |
| Automated assembly compatibility | SOD323F footprint supports high-speed pick-and-place and reflow soldering without tombstoning |
| Low-temperature-coefficient operation | +5.5 mV/°C TC minimizes drift-induced error in 0–85 °C ambient ranges |
| Halogen- and antimony-free construction | <900 ppm Br/Cl, <1000 ppm Sb - meets IPC-1752A environmental compliance for green electronics |
| RoHS 3 and lead-free compliance | No intentionally added lead; fully compliant with EU Directive 2015/863/EU |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener diode provides precise 18 V reference to TL431 shunt regulator input, setting primary-side feedback threshold. Use Value: Tight VZ tolerance ensures ±1.5% output voltage accuracy across line/load/temperature variations. |
Use Scenario: Biasing and clamping analog front-end stages in 4–20 mA transmitter modules. IC Role / Device Role / Timing Role: Acts as overvoltage clamp protecting op-amp inputs during ESD events or sensor cable faults. Use Value: Low 0.07 µA leakage avoids loading high-impedance sensor bridges while maintaining fast transient response. |
| Automotive Body Control Module Reference | Programmable Logic Controller Input Protection |
|
Use Scenario: Providing stable reference for microcontroller ADC measurements of battery voltage and HVAC sensor signals. IC Role / Device Role / Timing Role: Zener establishes known 18 V rail for internal LDOs and analog comparators in AEC-Q100 qualified systems. Use Value: −65 to +150 °C operating range and AEC-Q101 qualification ensure reliability in under-dash environments. |
Use Scenario: Protecting digital input channels from field-wiring surges in industrial PLC backplanes. IC Role / Device Role / Timing Role: Functions as low-leakage clamp limiting input voltage to 18.33 V, preventing damage to 24 V logic receivers. Use Value: 45 Ω Zener impedance ensures clamping voltage stays within safe margin during 100 ns surge pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | 18 V nominal, ±5% tolerance, 15 Ω ZZT, SOT-23 package, 350 mW rating | Lower power handling and smaller thermal mass; higher ZZT improves noise rejection but reduces regulation stiffness | Select when board space is constrained and 350 mW suffices; verify thermal derating at 85 °C ambient |
| MMSZ5246B-TP | 18 V nominal, ±5% tolerance, 30 Ω ZZT, SOD-123 package, 500 mW rating | Larger SOD-123 footprint increases board area but offers better thermal dissipation margin | Prefer for high-reliability industrial designs requiring proven long-term stability and wider solder joint reliability margin |
Compared with BZX84-C18LT1G and MMSZ5246B-TP, DDZ18CSF-7 delivers identical voltage accuracy in a smaller SOD323F footprint while maintaining full 500 mW capability-ideal for space-constrained, thermally managed PCB layouts requiring automotive-grade robustness.
Availability
DDZ18CSF-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive body control modules, and programmable logic controller input protection requiring stable component supply and AEC-Q101 qualified performance.
Supply support for DDZ18CSF-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 components for automotive, industrial, and computing markets.
The DDZ series targets precision voltage reference applications demanding tight VZ tolerance, low leakage, and AEC-Q101 qualification-designed specifically for feedback regulation and overvoltage protection in harsh-environment electronics.
FAQ
What is the maximum steady-state power dissipation for DDZ18CSF-7?
The DDZ18CSF-7 is rated for 500 mW continuous power dissipation when mounted on an FR-4 PCB with a 10 mm × 10 mm copper pad and board dimensions of 35 mm × 25 mm. Derating begins linearly above +25 °C ambient, reaching zero power at +150 °C per the published derating curve.
Does DDZ18CSF-7 meet automotive qualification standards?
Yes-DDZ18CSF-7 is qualified to AEC-Q101 for stress testing including HTGB, HTRB, TCT, and mechanical shock. It is manufactured in IATF 16949 certified facilities and supports PPAP documentation upon request for automotive OEM programs.
How is polarity identified on the SOD323F package?
The cathode is marked by a visible band on the top surface of the SOD323F package. When viewed from the top with the band on the left, the left pad is cathode and the right pad is anode-consistent with JEDEC-standard SOD323F orientation and Diodes' marking diagram.
What is the typical temperature coefficient for DDZ18CSF-7?
The temperature coefficient is approximately +5.5 mV/°C, derived from the device's position on the manufacturer's published TC vs. VZ curve (Figure 3). This value reflects average drift between −40 °C and +125 °C and enables predictable compensation in reference designs.
DDZ18CSF-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):
- 17.88 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 70 nA @ 16.5 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
DDZ18CSF-7 FAQ
1.How can I place an order for DDZ18CSF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ18CSF-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 DDZ18CSF-7 reliable?
The price and inventory of DDZ18CSF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ18CSF-7 is usually 5 days.
3.What payment methods are accepted for DDZ18CSF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ18CSF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ18CSF-7?
DDZ18CSF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ18CSF-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 DDZ18CSF-7?
For technical support, including DDZ18CSF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ18CSF-7 requirements.
6.How does Aetrix verify that DDZ18CSF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ18CSF-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 DDZ18CSF-7 meets industry standards.
7.What is the process for return or replacement of DDZ18CSF-7?
All DDZ18CSF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ18CSF-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 DDZ18CSF-7 part is unused and in its original packaging.
Return procedure for DDZ18CSF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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