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Diodes Incorporated DDZ18ASF-7
- Part No.:
- DDZ18ASF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ18ASF-7.pdf
- Description:
- DIODE ZENER 16.64V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:5,050
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Product details
Overview
DDZ18ASF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode in SOD323F package, with nominal zener voltage 16.22–17.06 V at 10 mA test current, 45 Ω maximum zener impedance, and ±0.07 µA reverse leakage at 15.4 V. It delivers tight voltage tolerance for voltage reference and regulation in low-power analog circuits.
For engineers reviewing the DDZ18ASF-7 datasheet, DDZ18ASF-7 pinout, DDZ18ASF-7 application, or DDZ18ASF-7 equivalent, key selection criteria include zener voltage range (16.22–17.06 V), thermal resistance (250 °C/W), moisture sensitivity level (MSL 1), RoHS/Green compliance, and SOD323F footprint compatibility with automated assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. Its 10 mA zener test current and 45 Ω dynamic impedance ensure predictable regulation behavior in feedback loops and sensing circuits.
The device features a cathode band marking, matte tin-annealed copper alloy terminals, and is rated for -65 °C to +150 °C operating temperature. Its 250 °C/W junction-to-ambient thermal resistance assumes mounting on FR-4 PCB with 10 mm × 10 mm pad per JEDEC standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.22–17.06 V @ IZT = 10 mA - defines stable regulation window for mid-range voltage references |
| Power Dissipation (PD) | 500 mW - supports continuous operation at up to 10 mA without derating below 70 °C ambient |
| Zener Impedance (ZZT) | ≤45 Ω @ 1 kHz - ensures minimal output voltage variation under small-signal AC load changes |
| Reverse Leakage (IR) | ≤0.07 µA @ VR = 15.4 V - guarantees negligible error current in high-impedance reference nodes |
| Thermal Resistance (RθJA) | 250 °C/W - requires minimal PCB copper area (10 mm × 10 mm) for safe thermal management |
| Package | SOD323F - 2-pin surface-mount outline with 1.25 mm width, 1.70 mm length, and 0.403 mm pad pitch |
| Moisture Sensitivity | Level 1 per J-STD-020 - allows unlimited floor life; no bake required before reflow |
Pinout & Package
Package: SOD323F - ultra-compact plastic molded case with cathode band marking; dimensions: 1.25 mm (D) × 1.70 mm (E) × 0.403 mm (pad pitch); weight ≈ 0.004 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit ground or lower-potential rail; forms reference return path |
| Cathode | Reverse-biased Zener terminal / regulated output node | Provides stable voltage relative to anode; marked by visible band on package body |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage regulation | 16.22–17.06 V range with ≤±2.6% tolerance at 10 mA enables accurate biasing in analog front-ends |
| Low dynamic impedance | 45 Ω max ensures <1.5 mV output shift per 1 µA load change - critical for ADC reference stability |
| Automated assembly compatibility | SOD323F footprint and matte tin finish support high-yield reflow soldering without tombstoning |
| Environmental compliance | Fully RoHS 3 compliant, halogen/antimony-free ("Green"), and lead-free per EU directives |
| Robust thermal performance | Rated for -65 °C to +150 °C operation with MSL 1 handling - suitable for automotive under-hood use |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Reference |
|---|---|
|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Zener diode provides fixed 16.7 V reference for op-amp biasing and ADC input scaling. Use Value: Tight 16.22–17.06 V tolerance and 0.07 µA leakage minimize offset drift across -40 °C to +85 °C. |
Use Scenario: Generating precise 16.5 V auxiliary supply for USB-C PD controller monitoring circuitry. IC Role / Device Role / Timing Role: Acts as shunt regulator to clamp and stabilize voltage for PD policy engine reference rails. Use Value: 45 Ω zener impedance maintains <±5 mV regulation error during transient load steps up to 5 mA. |
| Automotive Body Control Module (BCM) | Medical Portable Instrument Power Rail |
|
Use Scenario: Providing isolated 16.8 V reference for LIN bus transceiver bias in door module ECUs. IC Role / Device Role / Timing Role: Zener diode regulates local supply for transceiver VCC, decoupled from noisy main 12 V rail. Use Value: MSL 1 rating and -65 °C to +150 °C operation ensure reliability in unheated vehicle compartments. |
Use Scenario: Establishing calibrated 16.5 V reference for battery fuel gauge IC in handheld ultrasound devices. IC Role / Device Role / Timing Role: Supplies stable voltage to coulomb counter's internal ADC reference input. Use Value: 0.004 g mass and SOD323F size enable integration into space-constrained portable PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DDZ18BSF-7 | Zener voltage 16.82–17.70 V; same package, power, and impedance specs | Narrower tolerance band shifts regulation point upward by ~0.5 V average | Select when system requires higher nominal reference voltage with identical thermal and layout behavior |
| BZX84-C18LT1G | 18 V nominal (17.1–18.9 V), 350 mW rating, SOT-23 package, 50 Ω ZZT | Larger footprint, lower power rating, and wider voltage spread reduce precision in tight-tolerance designs | Choose only if SOT-23 is mandated and ±0.9 V tolerance is acceptable for the application |
Compared with DDZ18ASF-7, DDZ18BSF-7 offers a higher nominal voltage with identical thermal and packaging behavior, while BZX84-C18LT1G trades precision and power capability for legacy SOT-23 compatibility - making DDZ18ASF-7 optimal for new designs demanding tight 16.22–17.06 V regulation in minimal area.
Availability
DDZ18ASF-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery reference, automotive body control modules, and medical portable instrument power rails requiring stable component supply and long-term obsolescence management.
Supply support for DDZ18ASF-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, energy-efficient components for industrial, automotive, and consumer markets.
The DDZ series targets precision voltage reference applications where tight zener tolerance, low leakage, and robust thermal performance are essential - particularly in space-constrained, thermally demanding environments.
FAQ
What is the maximum continuous zener current for DDZ18ASF-7 at 25°C ambient?
The device is rated for 500 mW power dissipation. At 16.6 V nominal zener voltage, this corresponds to a maximum continuous zener current of approximately 30.1 mA (500 mW ÷ 16.6 V). However, the datasheet specifies 10 mA as the standard test current for VZ measurement, and derating begins above 70 °C ambient per the power derating curve.
Does DDZ18ASF-7 require a heatsink for operation at full power?
No heatsink is required. The SOD323F package achieves 250 °C/W junction-to-ambient thermal resistance when mounted on a standard FR-4 PCB with a 10 mm × 10 mm copper pad. At 500 mW dissipation and 25 °C ambient, junction temperature rises to approximately 150 °C - within its -65 °C to +150 °C rating, provided board layout follows recommended pad dimensions.
How does the cathode band marking align with the SOD323F pinout?
The cathode band is located at the end of the SOD323F package opposite the chamfered corner. When viewed from the top with the band to the left, the left pad is cathode and the right pad is anode. This matches the standard SOD323F orientation used in Diodes' package drawings and IPC-compliant land patterns.
Is DDZ18ASF-7 qualified for automotive AEC-Q101 stress testing?
DDZ18ASF-7 is not explicitly listed as AEC-Q101 qualified in the DS31987 datasheet. While Diodes offers AEC-Q101 versions in the DDZ family (e.g., parts suffixed "-7Q"), the "-7" suffix here denotes tape-and-reel packaging only. For automotive applications requiring AEC-Q101, consult Diodes' automotive product selector or contact their sales team for qualified alternatives.
DDZ18ASF-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):
- 16.64 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 70 nA @ 15.4 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
DDZ18ASF-7 FAQ
1.How can I place an order for DDZ18ASF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ18ASF-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 DDZ18ASF-7 reliable?
The price and inventory of DDZ18ASF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ18ASF-7 is usually 5 days.
3.What payment methods are accepted for DDZ18ASF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ18ASF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ18ASF-7?
DDZ18ASF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ18ASF-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 DDZ18ASF-7?
For technical support, including DDZ18ASF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ18ASF-7 requirements.
6.How does Aetrix verify that DDZ18ASF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ18ASF-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 DDZ18ASF-7 meets industry standards.
7.What is the process for return or replacement of DDZ18ASF-7?
All DDZ18ASF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ18ASF-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 DDZ18ASF-7 part is unused and in its original packaging.
Return procedure for DDZ18ASF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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