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Diodes Incorporated DDZ18CS-7
- Part No.:
- DDZ18CS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
DDZ18CS-7.pdf
- Description:
- DIODE ZENER 18V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,817
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Product details
Overview
DDZ18CS-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 17.42–18.33 V, 10 mA test current, 23 Ω maximum zener impedance at 5 mA, 0.05 µA maximum reverse leakage at 14.0 V, and 200 mW power dissipation in SOD323 package - used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the DDZ18CS-7 datasheet, DDZ18CS-7 pinout, DDZ18CS-7 application, or DDZ18CS-7 equivalent, key selection criteria include zener voltage tolerance (±2.6%), temperature coefficient (~+0.07%/°C), low leakage, sharp breakdown, and SOD323 footprint compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse bias above its specified zener voltage range. Its sharp breakdown and tight VZ tolerance (±2.6% at 10 mA) enable stable regulation in feedback loops and precision biasing networks.
Thermal resistance of 625°C/W and derating curve support operation up to +150°C ambient. The SOD323 package's low thermal mass and matte tin finish ensure reliable solderability and thermal response in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage Range | 17.42–18.33 V at IZT = 10 mA - defines regulation window for stable reference under nominal bias |
| Zener Impedance | 23 Ω max at IZ = 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage Current | 0.05 µA max at VR = 14.0 V - enables ultra-low quiescent current in battery-powered references |
| Power Dissipation | 200 mW - sets maximum continuous power handling on FR-4 board with recommended pad layout |
| Package | SOD323 - 1.30 mm × 1.70 mm surface-mount outline compatible with high-density routing and reflow assembly |
| Temperature Coefficient | ~+0.07%/°C (inferred from Fig. 14, VZ ≈ 18 V, IZT = 5 mA) - supports predictable drift compensation in mid-voltage references |
Pinout & Package
SOD323 package: 2-terminal surface-mount case with cathode band marking; dimensions: 1.30 mm (D) × 1.70 mm (E) × 0.30 mm (L); weight ≈ 0.004 g; UL 94V-0 rated molded plastic body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common; establishes reference potential when cathode is biased positive |
| Cathode | Zener breakdown terminal / Regulated output node | Connected to regulated voltage rail; maintains stable VZ across load when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp breakdown characteristics | Enables precise turn-on behavior in overvoltage clamping and reference startup without soft knee or hysteresis |
| Tight VZ tolerance (±2.6%) | Reduces need for post-assembly trimming in production-grade voltage references and ADC/DAC bias networks |
| Low leakage (0.05 µA @ 14 V) | Minimizes error current in high-impedance reference dividers and sensor excitation circuits |
| SOD323 package with matte tin finish | Ensures consistent solder wetting and reliability in lead-free reflow profiles per JEDEC J-STD-020 Level 1 |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Reference |
|---|---|
|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation modules. IC Role / Device Role / Timing Role: Precision voltage reference providing fixed bias to Wheatstone bridge, enabling ratiometric measurement accuracy. Use Value: ±2.6% VZ tolerance and <0.05 µA leakage maintain sub-0.1% full-scale error across -40°C to +105°C operating range. |
Use Scenario: Generating 18 V reference for USB PD sink controller feedback loop in portable chargers. IC Role / Device Role / Timing Role: Zener clamp defining upper voltage threshold in optocoupler-isolated feedback path. Use Value: Sharp breakdown and 23 Ω dynamic impedance ensure fast transient response during CC/CV mode transitions. |
| Medical Wearable Battery Monitor | Automotive Body Control Module LDO Trim |
|
Use Scenario: Supplying stable reference to fuel gauge IC in lithium-ion battery packs for smart patches. IC Role / Device Role / Timing Role: Low-power voltage reference for coulomb counter ADC input scaling. Use Value: 0.05 µA leakage preserves battery shelf life >12 months while maintaining 18 V reference stability. |
Use Scenario: Setting trim point for 5 V LDO output in BCM microcontroller power domain. IC Role / Device Role / Timing Role: Zener diode in resistor divider network adjusting feedback voltage to LDO error amplifier. Use Value: Tight VZ tolerance eliminates need for calibration during manufacturing, reducing test time by 15%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | Wider VZ tolerance (±5%), higher ZZT (40 Ω), same SOT-23 package | Acceptable where cost sensitivity outweighs regulation precision; not suitable for <0.5% reference designs | Select when BOM cost reduction is prioritized over voltage accuracy and thermal stability |
| MMSZ4689T1G | VZ = 18 V nominal, ±5% tolerance, 40 Ω ZZT, SOD-123 package (larger footprint) | Requires PCB redesign due to different pad layout; higher leakage (1 µA @ 14.4 V) | Choose only if existing SOD-123 inventory or legacy layout constraints prevent SOD323 adoption |
Compared with BZX84-C18LT1G and MMSZ4689T1G, DDZ18CS-7 delivers tighter voltage control, lower dynamic impedance, and smaller footprint - critical for space-constrained, high-accuracy analog subsystems where reference drift must stay below ±0.1% over temperature.
Availability
DDZ18CS-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery reference, medical wearable battery monitoring, and automotive body control module LDO trim requiring stable component supply and RoHS-compliant sourcing.
Supply support for DDZ18CS-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.
DDZ18CS-7 belongs to the DDZxxS series of precision Zener diodes designed specifically for high-stability voltage reference and regulation in space-constrained, low-power applications demanding tight tolerance and low leakage.
FAQ
What is the maximum continuous power dissipation for DDZ18CS-7?
The DDZ18CS-7 has a maximum power dissipation of 200 mW at +25°C ambient, derated linearly to zero at +150°C using the 625°C/W junction-to-ambient thermal resistance. This assumes mounting on an FR-4 PCB with Diodes Incorporated's recommended pad layout.
Does DDZ18CS-7 meet RoHS and halogen-free requirements?
Yes - DDZ18CS-7 is fully RoHS 2 compliant (2011/65/EU), lead-free, and halogen- and antimony-free ("Green" per Diodes Incorporated definition: <900 ppm Br, <900 ppm Cl, <1000 ppm Sb). Certification is documented in DS30414 Rev. 10-2.
How does the temperature coefficient affect regulation accuracy over temperature?
At ~18 V, DDZ18CS-7 exhibits a positive temperature coefficient of approximately +0.07%/°C (per Fig. 14). Over a -40°C to +105°C range, this contributes ±1.0% VZ drift, which is mitigated in practice by pairing with negative-TC components or using in closed-loop feedback systems.
Can DDZ18CS-7 be used in place of a 1N4746A?
No - the 1N4746A is a through-hole 18 V Zener in DO-41 package (1 W rating, 25 Ω ZZT). DDZ18CS-7 is SOD323 surface-mount, rated for 200 mW and optimized for low-leakage, high-precision use - not a direct replacement for high-power or legacy through-hole designs.
DDZ18CS-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:
- ±3%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14 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-323
DDZ18CS-7 FAQ
1.How can I place an order for DDZ18CS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ18CS-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 DDZ18CS-7 reliable?
The price and inventory of DDZ18CS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ18CS-7 is usually 5 days.
3.What payment methods are accepted for DDZ18CS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ18CS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ18CS-7?
DDZ18CS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ18CS-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 DDZ18CS-7?
For technical support, including DDZ18CS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ18CS-7 requirements.
6.How does Aetrix verify that DDZ18CS-7 is sourced from the original manufacturer or authorized distributors?
All DDZ18CS-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 DDZ18CS-7 meets industry standards.
7.What is the process for return or replacement of DDZ18CS-7?
All DDZ18CS-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ18CS-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 DDZ18CS-7 part is unused and in its original packaging.
Return procedure for DDZ18CS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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