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Diodes Incorporated DDZ18BSF-7
- Part No.:
- DDZ18BSF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ18BSF-7.pdf
- Description:
- DIODE ZENER 17.26V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:7,245
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Product details
Overview
DDZ18BSF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage of 16.82–17.70 V at 10 mA test current, ±5% tolerance, 45 Ω dynamic impedance at 1 kHz, and 0.07 µA reverse leakage at 16.00 V. It operates from –65 °C to +150 °C and is used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the DDZ18BSF-7 datasheet, DDZ18BSF-7 pinout, DDZ18BSF-7 application, or DDZ18BSF-7 equivalent, this device is selected for stable low-current voltage reference, overvoltage clamping in sensor interfaces, and biasing in automotive-grade signal conditioning stages where tight VZ tolerance and low thermal drift are required.
Technical Context
This Zener diode employs silicon planar epitaxial construction optimized for stable breakdown characteristics under DC and low-frequency AC conditions. Its 10 mA zener test current and 45 Ω impedance ensure predictable regulation across ambient temperatures from –65 °C to +150 °C.
The SOD323F package enables high-density PCB layout while maintaining 500 mW power dissipation on FR-4 with 250 °C/W junction-to-ambient thermal resistance. Cathode band marking and matte tin-plated terminals support automated reflow assembly per J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.82–17.70 V @ IZT = 10 mA - defines regulated output voltage range under standard test conditions |
| Power Dissipation (PD) | 500 mW on FR-4 PCB - maximum continuous power handling without derating at 25 °C ambient |
| Zener Impedance (ZZT) | 45 Ω @ f = 1 kHz - indicates regulation stiffness; lower values yield tighter voltage stability under load variation |
| Reverse Leakage (IR) | 0.07 µA @ VR = 16.00 V - ensures minimal quiescent current draw in standby or high-impedance reference nodes |
| Operating Temperature | –65 °C to +150 °C - supports deployment in under-hood automotive, industrial control, and outdoor sensor environments |
| Package | SOD323F - ultra-small 2-pin surface-mount outline (1.25 × 1.70 mm) with cathode band identification |
| Thermal Resistance (RθJA) | 250 °C/W - determines temperature rise above ambient per watt dissipated; critical for thermal design margin |
Pinout & Package
Package: SOD323F - molded plastic, halogen- and antimony-free "Green" compound (UL 94V-0), 0.004 g weight, matte tin annealed terminals solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; forms reference return path during regulation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to supply rail or voltage node requiring stabilization; delivers precise VZ when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±5% (16.82–17.70 V range) - enables accurate voltage referencing without external trimming in 12–24 V systems |
| Low dynamic impedance | 45 Ω at 1 kHz - minimizes output voltage deviation under varying load currents in feedback or bias networks |
| Automated assembly compatibility | SOD323F footprint with J-STD-020 Level 1 moisture rating - supports high-yield reflow without baking or special handling |
| High-temperature operation | Rated to +150 °C junction temperature - suitable for engine control units, motor drivers, and industrial power supplies |
| Environmental compliance | Fully RoHS 3 compliant, halogen- and antimony-free - meets automotive AEC-Q200-aligned manufacturing standards |
Applications
| Automotive Sensor Biasing | Industrial Analog Reference |
|---|---|
|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) and pressure transducers in engine management modules. IC Role / Device Role / Timing Role: Precision voltage reference source for analog front-end conditioning circuits. Use Value: Tight 5% VZ tolerance and low 0.07 µA leakage maintain measurement accuracy across –40 °C to +125 °C operating range. |
Use Scenario: Generating fixed reference voltage for 12-bit ADCs in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Low-drift Zener reference replacing higher-cost bandgap ICs in cost-sensitive industrial DAQ systems. Use Value: 45 Ω impedance ensures <10 mV output shift under 200 µA load variation, meeting ±½ LSB error budget. |
| Overvoltage Clamp Protection | Low-Power Voltage Regulation |
|
Use Scenario: Clamping transient surges on 18 V CAN bus power rails in body electronics modules. IC Role / Device Role / Timing Role: Fast-response shunt protection element limiting rail voltage to safe levels during load dump events. Use Value: 500 mW rating and 250 °C/W RθJA allow brief 100 ms surge absorption without thermal runaway. |
Use Scenario: Regulating auxiliary 16.5 V supply for microcontroller reset supervisors and watchdog timers. IC Role / Device Role / Timing Role: Standalone shunt regulator delivering stable bias to low-quiescent circuits. Use Value: 0.07 µA reverse leakage preserves battery life in always-on monitoring applications with >10-year shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | 18.2–19.8 V range @ 5 mA, 50 Ω ZZT, SOT-23 package | Higher test current (5 mA vs. 10 mA) and wider VZ tolerance (±5.6%) | Select when SOT-23 footprint is preferred and 5 mA bias is available; less optimal for low-leakage designs |
| MMSZ5246B-TP | 17.1–18.9 V range @ 20 mA, 30 Ω ZZT, SOD-123 package | Higher power rating (500 mW same, but rated at 20 mA), lower impedance, larger footprint | Choose for improved regulation stiffness where board space allows SOD-123; not drop-in compatible |
Compared with BZX84-C18LT1G and MMSZ5246B-TP, DDZ18BSF-7 offers tighter VZ tolerance at 10 mA bias, lower leakage, and smaller SOD323F footprint-making it optimal for space-constrained, low-power automotive and industrial references where precision and thermal robustness are prioritized.
Availability
DDZ18BSF-7 is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog reference, overvoltage clamp protection, and low-power voltage regulation requiring stable component supply across extended temperature ranges.
Supply support for DDZ18BSF-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.
DDZ18BSF-7 belongs to the DDZxx(x)xSF precision Zener series designed for stable voltage reference and regulation in space-constrained, thermally demanding applications where tight tolerance and low leakage are essential.
FAQ
What is the maximum continuous power dissipation for DDZ18BSF-7?
The DDZ18BSF-7 is rated for 500 mW power dissipation when mounted on a standard FR-4 PCB with a 10 mm × 10 mm copper pad. Derating begins above 25 °C ambient per the published power derating curve, reaching zero dissipation at 150 °C ambient due to its 250 °C/W thermal resistance.
Does DDZ18BSF-7 meet AEC-Q200 requirements for automotive use?
DDZ18BSF-7 is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not individually AEC-Q200 qualified, Diodes states that parts in this family are suitable for automotive applications requiring specific change control-and full qualification can be pursued upon customer request with appropriate testing and documentation.
How does the SOD323F package affect thermal performance compared to SOD-123?
The SOD323F package has a smaller footprint (1.25 × 1.70 mm vs. 2.7 × 1.6 mm) and higher thermal resistance (250 °C/W vs. ~200 °C/W for SOD-123), resulting in greater junction temperature rise under identical power dissipation. This requires careful PCB copper area allocation and ambient temperature limits in high-reliability designs.
Can DDZ18BSF-7 be used in series or parallel configurations?
DDZ18BSF-7 is not recommended for parallel operation due to mismatched zener voltages causing current hogging. In series, total voltage equals sum of individual VZ values, but thermal coupling and impedance mismatch may reduce overall regulation accuracy-designs should verify stability under worst-case tolerance stacking and temperature gradients.
DDZ18BSF-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):
- 17.26 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 70 nA @ 16 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
DDZ18BSF-7 FAQ
1.How can I place an order for DDZ18BSF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ18BSF-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 DDZ18BSF-7 reliable?
The price and inventory of DDZ18BSF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ18BSF-7 is usually 5 days.
3.What payment methods are accepted for DDZ18BSF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ18BSF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ18BSF-7?
DDZ18BSF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ18BSF-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 DDZ18BSF-7?
For technical support, including DDZ18BSF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ18BSF-7 requirements.
6.How does Aetrix verify that DDZ18BSF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ18BSF-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 DDZ18BSF-7 meets industry standards.
7.What is the process for return or replacement of DDZ18BSF-7?
All DDZ18BSF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ18BSF-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 DDZ18BSF-7 part is unused and in its original packaging.
Return procedure for DDZ18BSF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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