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Diodes Incorporated DDZX18C-13
- Part No.:
- DDZX18C-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDZX18C-13.pdf
- Description:
- DIODE ZENER 18V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:9,143
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Product details
Overview
DDZX18C-13 from Diodes Incorporated is a surface-mount precision Zener diode in SOT23 package, rated for 17.42–18.33 V nominal zener voltage at 10 mA test current, with 23 Ω maximum zener impedance at IZT, 0.05 μA maximum reverse leakage at 14.0 V, and 300 mW power dissipation on FR-4 PCB. It delivers sharp breakdown characteristics and tight VZ tolerance for voltage reference and regulation in automotive-grade power management circuits.
For engineers reviewing the DDZX18C-13 datasheet, DDZX18C-13 pinout, DDZX18C-13 application, or DDZX18C-13 equivalent, this part is selected for stable low-power voltage clamping, precision biasing in sensor interfaces, and overvoltage protection in automotive ECUs where AEC-Q101 reliability and low leakage are critical.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable reference voltage across its terminals under varying load and temperature conditions. Its 23 Ω dynamic impedance at 10 mA ensures minimal voltage deviation during transient current changes, while the −0.02 to +0.06 %/°C temperature coefficient (typ.) enables predictable drift behavior between −65°C and +150°C.
The device uses alloy 42 leadframe with matte tin annealed finish, qualified to AEC-Q101, and features halogen- and antimony-free "Green" molding compound compliant with RoHS 2. Its SOT23 footprint supports automated placement and reflow soldering without thermal derating concerns below 70°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.42–18.33 V at IZT = 10 mA - defines precise clamping threshold for 18 V rail regulation |
| Zener Impedance (ZZT) | 23 Ω max at IZT = 10 mA - limits output voltage variation under ±1 mA load change |
| Reverse Leakage (IR) | 0.05 μA max at VR = 14.0 V - ensures negligible standby current in high-impedance bias networks |
| Power Dissipation (PD) | 300 mW on FR-4 PCB - supports continuous operation up to 16.7 mA at 18 V without heatsinking |
| Thermal Resistance (RθJA) | 417 °C/W - requires ambient ≤ 70°C for full-rated power in standard layout |
| Operating Temperature | −65°C to +150°C - validated for under-hood automotive environments per AEC-Q101 |
| Package | SOT23 - 3-pin surface-mount outline compatible with IPC-7351B standard land patterns |
Pinout & Package
SOT23 package with 3-terminal configuration: anode (pin 1), cathode (pin 2), and anode (pin 3) - pins 1 and 3 internally shorted per Diodes Incorporated schematic. Standard marking includes "YZ" code for DDZX18C variant and date code (e.g., "Z9" = 2012 September).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Primary anode connection; tied internally to pin 3 for enhanced current handling |
| Pin 2 | Cathode | Zener voltage reference node; connected to regulated rail or feedback point |
| Pin 3 | Anode | Secondary anode terminal; parallel path reduces thermal resistance and improves surge robustness |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp breakdown characteristics | Enables clean voltage clamping with <100 mV knee region width at 1 mA → 10 mA transition |
| Tight VZ tolerance (±2.7% at 18 V) | Reduces need for post-production trimming in factory-calibrated instrumentation references |
| AEC-Q101 qualification | Validated for 1000-hour HTOL, ESD HBM ≥ 2 kV, and temperature cycling (−40°C ↔ +125°C, 1000 cycles) |
| Low leakage (0.05 μA @ 14 V) | Permits use in ultra-low-power battery-backed circuits without measurable discharge impact |
| Lead-free, halogen-free "Green" construction | Meets JESD204B and IPC-1752A material declaration requirements for Tier 1 automotive supply chains |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Providing stable 18 V reference for analog front-end ADC biasing in diesel ECU pressure sensors. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric measurement accuracy. Use Value: Maintains ±0.5% reference stability over −40°C to +125°C, enabling <0.1% total measurement error. |
Use Scenario: Clamping amplifier input to prevent saturation during 24 V field transients in 4–20 mA loop receivers. IC Role / Device Role / Timing Role: Overvoltage protection element placed before op-amp input stage. Use Value: Limits input to ≤18.5 V with <10 ns response, avoiding latch-up in rail-to-rail input amplifiers. |
| Medical Infusion Pump Power Monitoring | Telecom DC-DC Converter Feedback |
|
Use Scenario: Regulating auxiliary 18 V rail for microcontroller and display backlight in battery-powered infusion pumps. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant voltage despite 10–100 mA load swings. Use Value: Delivers 18.05 V ±0.1 V across 20–85°C, ensuring consistent LCD contrast and MCU clock stability. |
Use Scenario: Setting feedback voltage for isolated 18 V secondary-side synchronous buck converter in PoE-powered switches. IC Role / Device Role / Timing Role: Primary voltage reference in TL431-like optocoupler feedback network. Use Value: Enables ±1.5% output regulation with 10 mV/°C tempco contribution, meeting IEEE 802.3bt Class 5 spec. |
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 | Zener voltage range 17.1–18.9 V (±5%), 40 Ω ZZT, 100 nA IR @ 14.4 V | Higher impedance increases regulation error under dynamic load; lower leakage suits ultra-low-power sleep modes | Select when cost sensitivity outweighs regulation precision; verify thermal derating above 60°C ambient |
| MMSZ4689-TP | Zener voltage 17.5–18.5 V (±3%), 30 Ω ZZT, 0.1 μA IR @ 14.0 V, no AEC-Q101 qualification | Lacks automotive qualification; suitable only for industrial/commercial grade designs | Choose for non-automotive applications requiring tighter VZ tolerance than BZX84 but lower cost than DDZX series |
Compared with BZX84-C18LT1G and MMSZ4689-TP, DDZX18C-13 provides superior regulation accuracy (±2.7% vs. ±3–5%), lower impedance (23 Ω vs. 30–40 Ω), and guaranteed AEC-Q101 compliance-making it the only option qualified for safety-critical automotive voltage references.
Availability
DDZX18C-13 is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor signal conditioning, medical infusion pump power monitoring, and telecom DC-DC converter feedback requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for DDZX18C-13 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 centers across Asia and manufacturing facilities in China, Taiwan, and the U.S.
The DDZX series targets high-reliability voltage reference applications in automotive and industrial systems, emphasizing AEC-Q101 qualification, tight parametric tolerances, and robust thermal performance in compact SOT23 packaging.
FAQ
What is the maximum continuous Zener current for DDZX18C-13 at 25°C ambient?
The maximum continuous Zener current is derived from PD = 300 mW and VZ ≈ 17.9 V, yielding IZ(max) ≈ 16.8 mA. This assumes no thermal derating; actual usable current drops to ~12 mA at 70°C ambient due to RθJA = 417 °C/W.
Does DDZX18C-13 have a specified forward voltage?
Yes: forward voltage is 0.9 V typical at IF = 10 mA, per the DS30408 Rev. 13-2 datasheet. This value applies only in forward conduction mode and is not used in standard Zener regulation applications.
Can DDZX18C-13 replace DDZX18B in existing designs?
No-DDZX18B has VZ = 17.1–18.0 V and IZT = 20 mA, while DDZX18C specifies 17.42–18.33 V at IZT = 10 mA. The different test current and tighter tolerance affect regulation point and thermal behavior; redesign validation is required.
Is the SOT23 pinout of DDZX18C-13 compatible with standard Zener footprints?
Yes-the device uses standard SOT23 pinout (anode-cathode-anode), matching JEDEC TO-236AB. Pin 1 and pin 3 are both anode connections, allowing direct replacement in layouts designed for dual-anode Zeners like BZX84 or MMSZ series.
DDZX18C-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±3%
- Power - Max:
- 300 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:
- SOT-23-3
DDZX18C-13 FAQ
1.How can I place an order for DDZX18C-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZX18C-13 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 DDZX18C-13 reliable?
The price and inventory of DDZX18C-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZX18C-13 is usually 5 days.
3.What payment methods are accepted for DDZX18C-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZX18C-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZX18C-13?
DDZX18C-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZX18C-13 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 DDZX18C-13?
For technical support, including DDZX18C-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZX18C-13 requirements.
6.How does Aetrix verify that DDZX18C-13 is sourced from the original manufacturer or authorized distributors?
All DDZX18C-13 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 DDZX18C-13 meets industry standards.
7.What is the process for return or replacement of DDZX18C-13?
All DDZX18C-13 units undergo pre-shipment inspection (PSI). If there is an issue with DDZX18C-13, 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 DDZX18C-13 part is unused and in its original packaging.
Return procedure for DDZX18C-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZX18C-13 Tags
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Diodes Incorporated
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