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Diodes Incorporated DDZ3V9BSF-7
- Part No.:
- DDZ3V9BSF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ3V9BSF-7.pdf
- Description:
- DIODE ZENER 4.03V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:120,084
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Product details
Overview
DDZ3V9BSF-7 from Diodes Incorporated is a precision 3.89–4.16 V Zener diode in SOD323F package, rated for 500 mW power dissipation on FR-4 PCB, with 130 Ω max zener impedance at 20 mA test current and 10 µA max reverse leakage at 1 V reverse voltage. It serves as a stable voltage reference in low-power analog sensing, power supply feedback, and ADC reference circuits.
For engineers reviewing the DDZ3V9BSF-7 datasheet, DDZ3V9BSF-7 pinout, DDZ3V9BSF-7 application, or DDZ3V9BSF-7 equivalent, this page delivers verified electrical parameters, thermal derating behavior, SOD323F terminal mapping, automotive-grade packaging compliance, and direct alternatives for voltage reference design validation.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable breakdown voltage across its cathode-anode terminals under reverse bias. Its tight 5% tolerance (3.89–4.16 V), low 130 Ω dynamic impedance, and 10 µA IR @ 1 V ensure minimal output drift in precision biasing applications.
Thermal resistance of 250°C/W (junction-to-ambient, FR-4) and operation from –65°C to +150°C enable reliable use in compact industrial and automotive PCB layouts. The SOD323F package's matte tin–plated copper alloy leadframe ensures MIL-STD-202-compliant solderability and RoHS 3 / halogen-free compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.89–4.16 V @ IZT = 20 mA - defines stable regulation point for low-voltage reference designs |
| Power Dissipation (PD) | 500 mW on FR-4 (10 mm × 10 mm pad) - sets maximum continuous bias current limit (~121 mA at 4.16 V) |
| Zener Impedance (ZZT) | ≤130 Ω @ f = 1 kHz - ensures minimal AC ripple coupling into reference node |
| Reverse Leakage (IR) | ≤10 µA @ VR = 1 V - guarantees negligible loading error in high-impedance feedback paths |
| Thermal Resistance (RθJA) | 250°C/W - requires ambient derating above 75°C per Fig. 1 (e.g., 375 mW at +85°C) |
| Operating Temperature | –65°C to +150°C - supports under-hood automotive and industrial control environments |
| Package | SOD323F - 2.5 mm × 1.7 mm surface-mount outline with cathode band marking |
Pinout & Package
SOD323F is a two-terminal surface-mount package with cathode identified by a band on the top surface. Terminals are matte tin–annealed over copper alloy; anode and cathode leads are symmetrically positioned along the long axis.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground connection | Connected to system GND or low-impedance return path; establishes reference potential for regulated output |
| Cathode | Regulated voltage output | Delivers stable 3.89–4.16 V when reverse-biased; must be connected to load or feedback node via current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±2.5% typical (3.89–4.16 V range) - enables accurate 3.3 V rail monitoring without external trimming |
| Low dynamic impedance | ≤130 Ω at 20 mA - maintains <1 mV/V line regulation under varying load currents |
| Automated assembly compatibility | SOD323F footprint with J-STD-020 Level 1 moisture sensitivity - supports high-yield reflow without baking |
| Environmental compliance | RoHS 3, halogen-free (<900 ppm Br/Cl, <1000 ppm Sb), IATF 16949 manufacturing - meets Tier-1 automotive BOM requirements |
| Thermal stability | –65°C to +150°C operating range with defined derating curve - sustains accuracy in engine control units and motor drives |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Feedback |
|---|---|
|
Use Scenario: Biasing op-amp input stages in 4–20 mA loop transmitters with ±0.1% accuracy requirement. IC Role / Device Role / Timing Role: Provides stable 4.0 V reference for DAC output scaling and current-sense amplifier offset correction. Use Value: 130 Ω ZZT minimizes gain error drift vs. supply variation; 10 µA IR avoids loading high-Z sensor bridges. |
Use Scenario: Setting precise 5 V ±5% regulation threshold in USB-C PD sink controllers. IC Role / Device Role / Timing Role: Shunt reference in feedback divider network for programmable power supply ICs (e.g., TPS6598x). Use Value: Tight 3.89–4.16 V range allows direct use with 1% resistors to hit 5.0 V target; SOD323F footprint saves board space near USB connector. |
| Automotive Cabin Controller Reference | Medical Pulse Oximeter Analog Front-End |
|
Use Scenario: Generating stable bias for microcontroller ADC reference in HVAC control modules exposed to under-dash temperature swings. IC Role / Device Role / Timing Role: Low-drift voltage reference for 12-bit internal ADC used in thermistor-based temperature measurement. Use Value: –65°C to +150°C rating and 250°C/W RθJA allow operation without heatsink in sealed enclosures; AEC-Q200-ready packaging ensures qualification path. |
Use Scenario: Establishing calibrated LED drive current reference in portable pulse oximeters requiring <0.5% optical intensity stability. IC Role / Device Role / Timing Role: Sets baseline current for red/IR LED drivers via current mirror biasing. Use Value: 500 mW PD supports 10–20 mA bias current with margin; low IR prevents signal corruption in ultra-low-power sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B3V9,115 (Nexperia) | Same 3.9 V nominal, 500 mW, SOD323, but 150 Ω ZZT and 5 µA IR @ 1 V | Lower leakage improves high-Z sensor interfaces; higher ZZT increases ripple sensitivity | Select when leakage-limited accuracy dominates over AC noise rejection |
| MMSZ4685T1G (ON Semiconductor) | 3.9 V nominal, 500 mW, SOD123, 100 Ω ZZT, 10 µA IR @ 1 V, but larger footprint and 300°C/W RθJA | Better impedance performance but reduced thermal margin in dense layouts | Select when board space permits larger package and lower ZZT is critical for switching regulator feedback |
Compared with BZX384-B3V9 and MMSZ4685T1G, DDZ3V9BSF-7 offers the best balance of low ZZT, industry-leading thermal resistance, and automotive-qualified packaging-making it optimal for space-constrained, thermally demanding reference designs where both precision and reliability are mandatory.
Availability
DDZ3V9BSF-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C power delivery feedback, automotive cabin controllers, and medical analog front-end designs requiring stable component supply and full traceability.
Supply support for DDZ3V9BSF-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 computing markets.
This device belongs to the DDZxx(x)SF precision Zener series, engineered for stable voltage referencing in compact, thermally constrained PCBs where tight tolerance, low impedance, and automotive-grade process control are required.
FAQ
What is the recommended minimum current for stable Zener regulation in DDZ3V9BSF-7?
The datasheet specifies test current IZT = 20 mA for Zener voltage and impedance characterization. For stable regulation, maintain ≥5 mA to ensure operation within the specified VZ range and avoid the knee region. Below 1 mA, voltage drops significantly below 3.89 V due to exponential I–V curvature.
Can DDZ3V9BSF-7 be used in place of a 3.3 V Zener diode?
No-its guaranteed Zener voltage range is 3.89–4.16 V, making it unsuitable as a direct 3.3 V replacement. For 3.3 V reference, Diodes' DDZ3V3BSF (3.32–3.53 V) or DDZ3V0BSF (3.01–3.22 V) are appropriate alternatives with matching SOD323F package and specifications.
Does DDZ3V9BSF-7 meet AEC-Q200 stress testing requirements?
The datasheet states that automotive-grade versions require specific change control and PPAP capability, and directs users to contact Diodes for AEC-Q200-qualified parts. DDZ3V9BSF-7 itself is manufactured in IATF 16949-certified facilities but is not explicitly AEC-Q200 qualified unless ordered under an automotive-specific part number with qualifying suffixes.
How does the SOD323F package affect thermal performance compared to SOD123?
SOD323F has a lower thermal resistance (250°C/W) than standard SOD123 (typically ~300–350°C/W) due to optimized leadframe geometry and thinner mold compound. This allows 17% higher continuous power handling at the same ambient temperature, critical for compact power supply feedback networks where heat dissipation is limited.
DDZ3V9BSF-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):
- 4.03 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 1 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
DDZ3V9BSF-7 FAQ
1.How can I place an order for DDZ3V9BSF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ3V9BSF-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 DDZ3V9BSF-7 reliable?
The price and inventory of DDZ3V9BSF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ3V9BSF-7 is usually 5 days.
3.What payment methods are accepted for DDZ3V9BSF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ3V9BSF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ3V9BSF-7?
DDZ3V9BSF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ3V9BSF-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 DDZ3V9BSF-7?
For technical support, including DDZ3V9BSF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ3V9BSF-7 requirements.
6.How does Aetrix verify that DDZ3V9BSF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ3V9BSF-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 DDZ3V9BSF-7 meets industry standards.
7.What is the process for return or replacement of DDZ3V9BSF-7?
All DDZ3V9BSF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ3V9BSF-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 DDZ3V9BSF-7 part is unused and in its original packaging.
Return procedure for DDZ3V9BSF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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