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Diodes Incorporated DDZ18C-7
- Part No.:
- DDZ18C-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ18C-7.pdf
- Description:
- DIODE ZENER 18V 470MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,333
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Product details
Overview
DDZ18C-7 from Diodes Incorporated is a surface-mount precision Zener diode designed for voltage regulation and reference applications in power supply feedback loops, analog signal conditioning, and overvoltage protection circuits. It delivers a tightly controlled zener voltage range of 17.42 V to 18.33 V at 10 mA test current, with 23 Ω maximum zener impedance at 1 kHz, 0.05 µA maximum reverse leakage at 14.0 V, and operates across –65 °C to +150 °C.
For engineers reviewing the DDZ18C-7 datasheet, DDZ18C-7 pinout, DDZ18C-7 application, or DDZ18C-7 equivalent, this device is selected for stable low-power voltage reference needs where tight tolerance (±2.5% VZ), low temperature coefficient (~+0.07 %/°C), and SOD123 package compatibility with automated assembly are critical design requirements.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage under varying load and temperature conditions. Its 10 mA zener test current and 23 Ω dynamic impedance ensure predictable regulation performance in low-current bias networks and precision comparator references.
The device exhibits a positive temperature coefficient near +0.07 %/°C (per Fig. 17–18), indicating minimal drift over temperature - a key trait for stable voltage references in industrial sensor interfaces and regulated DC-DC feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage Range | 17.42 V to 18.33 V at IZT = 10 mA - defines usable regulation band for feedback or reference use |
| Zener Impedance | 23 Ω max at f = 1 kHz - ensures low AC error in reference applications |
| Reverse Leakage Current | 0.05 µA max at VR = 14.0 V - enables ultra-low quiescent current in battery-powered references |
| Power Dissipation | 294 mW at TA = +25°C (min pad layout) - sets thermal limit for PCB layout and derating |
| Operating Temperature | –65 °C to +150 °C - supports deployment in automotive under-hood and industrial control environments |
| Package | SOD123 - surface-mount footprint compatible with standard pick-and-place and reflow processes |
Pinout & Package
DDZ18C-7 uses the SOD123 package: a compact, molded plastic case with cathode band marking on the top surface. Terminals are matte tin-annealed alloy 42 leads, solderable per MIL-STD-202, Method 208. Moisture sensitivity level is J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit common or lower-potential rail in shunt regulator configuration |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable voltage referenced to anode; marked by visible band on package body |
Key Features
| Feature | Design Value |
|---|---|
| Tight VZ tolerance | ±2.5% (17.42–18.33 V) - reduces need for post-production trimming in voltage reference designs |
| Low zener impedance | 23 Ω max - minimizes output voltage variation under changing load current |
| Ultra-low leakage | 0.05 µA @ 14.0 V - preserves battery life and avoids loading high-impedance nodes |
| Automated assembly ready | SOD123 package with J-STD-020 Level 1 moisture rating - eliminates bake requirements before reflow |
| Green & RoHS-compliant | Halogen- and antimony-free, lead-free, UL 94V-0 rated - meets global environmental compliance mandates |
Applications
| Industrial Sensor Signal Conditioning | Switch-Mode Power Supply Feedback |
|---|---|
|
Use Scenario: Providing stable reference voltage for 4–20 mA transmitter front-end op-amps and ADC biasing. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise 18 V reference point for analog signal chain calibration. Use Value: ±2.5% VZ tolerance and <0.05 µA leakage prevent gain drift and offset errors in millivolt-level sensor outputs. |
Use Scenario: Setting output voltage in isolated flyback or forward converter feedback network via optocoupler divider. IC Role / Device Role / Timing Role: Precision shunt reference replacing TL431 in cost-sensitive, low-power auxiliary supplies. Use Value: 23 Ω zener impedance ensures stable regulation despite optocoupler CTR variation and line/load transients. |
| Automotive Body Control Module (BCM) | Portable Medical Instrument Reference |
|
Use Scenario: Overvoltage clamp and reference for LIN bus transceiver bias rails in under-hood modules. IC Role / Device Role / Timing Role: Zener clamp protecting 18 V logic rails against load dump spikes up to 40 V. Use Value: –65 °C to +150 °C operating range and AEC-Q101-qualified variants (DDZ18CQ-7) support direct placement near engine ECUs. |
Use Scenario: Low-noise voltage reference for portable ECG amplifier stages and battery-monitoring comparators. IC Role / Device Role / Timing Role: Stable 18 V reference source for rail-splitting and bias generation in ultra-low-power analog front ends. Use Value: 0.05 µA leakage and 23 Ω impedance enable sub-1 µA total reference current draw without sacrificing accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | Same SOD-123 package; wider VZ tolerance (±5%), higher ZZT (40 Ω), higher leakage (1 µA @ 14 V) | Acceptable for non-critical biasing but unsuitable for precision feedback or low-leakage references | Select when cost is primary concern and ±5% regulation is acceptable |
| MMSZ4689-TP | VZ = 18 V nominal, ±5% tolerance, ZZT = 35 Ω, leakage = 0.1 µA @ 14 V, same SOD-123 | Higher leakage and impedance reduce stability in high-impedance reference nodes | Prefer only if legacy qualification or second-source validation requires Micro Commercial Co. parts |
Compared with BZX84-C18LT1G and MMSZ4689-TP, DDZ18C-7 offers tighter voltage tolerance, lower dynamic impedance, and significantly reduced leakage - making it the preferred choice for precision voltage references where regulation stability and low quiescent current are design-critical.
Availability
DDZ18C-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and portable medical instrument designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for DDZ18C-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 consumer markets.
The DDZ series targets precision voltage reference and regulation applications, emphasizing tight Zener tolerance, low leakage, and robust thermal performance in compact surface-mount packages.
FAQ
What is the maximum power dissipation of DDZ18C-7 at room temperature?
DDZ18C-7 has a maximum power dissipation of 294 mW at TA = +25°C when mounted on an FR-4 PCB with minimum recommended pad layout (per Note 8). This value drops linearly above 25°C per the derating curve in Figure 1, reaching zero at ~150°C ambient.
Is DDZ18C-7 suitable for automotive applications?
Yes - the automotive-qualified variant DDZ18CQ-7 is AEC-Q101 qualified, PPAP capable, and manufactured in IATF16949 certified facilities. While DDZ18C-7 itself is commercial-grade, its identical electrical and thermal specs make it suitable for non-safety-critical automotive subsystems where full qualification is not mandated.
How is polarity identified on the DDZ18C-7 package?
Polarity is indicated by a cathode band - a visible dark stripe near one end of the SOD123 package body. The terminal adjacent to the band is the cathode; the opposite end is the anode. This matches standard diode marking convention and must be observed during PCB layout and assembly.
What is the typical temperature coefficient of DDZ18C-7?
Per Figures 17–18 in the datasheet, DDZ18C-7 exhibits a positive temperature coefficient of approximately +0.07 %/°C. This means its zener voltage increases by ~12.6 mV per °C rise across its 18 V nominal range, enabling predictable compensation in temperature-stable reference designs.
DDZ18C-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±3%
- Power - Max:
- 470 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-123
DDZ18C-7 FAQ
1.How can I place an order for DDZ18C-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ18C-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 DDZ18C-7 reliable?
The price and inventory of DDZ18C-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ18C-7 is usually 5 days.
3.What payment methods are accepted for DDZ18C-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ18C-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ18C-7?
DDZ18C-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ18C-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 DDZ18C-7?
For technical support, including DDZ18C-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ18C-7 requirements.
6.How does Aetrix verify that DDZ18C-7 is sourced from the original manufacturer or authorized distributors?
All DDZ18C-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 DDZ18C-7 meets industry standards.
7.What is the process for return or replacement of DDZ18C-7?
All DDZ18C-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ18C-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 DDZ18C-7 part is unused and in its original packaging.
Return procedure for DDZ18C-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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