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Diodes Incorporated DDZ33DSF-7
- Part No.:
- DDZ33DSF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ33DSF-7.pdf
- Description:
- DIODE ZENER 32.3V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:2,868
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Product details
Overview
DDZ33DSF-7 from Diodes Incorporated is a precision 33 V Zener diode in SOD323F package, rated for 500 mW power dissipation on FR-4 PCB, with ±1.5% zener voltage tolerance (31.49–33.11 V at 5 mA), 65 Ω maximum zener impedance at 1 kHz, and 0.07 µA reverse leakage at 29.9 V. It serves as a stable voltage reference in low-power analog monitoring circuits.
For engineers reviewing the DDZ33DSF-7 datasheet, DDZ33DSF-7 pinout, DDZ33DSF-7 application, or DDZ33DSF-7 equivalent, this device is selected for high-accuracy voltage regulation in space-constrained industrial sensor signal conditioning, automotive body control modules, and portable instrumentation where tight VZ tolerance and low thermal resistance (250 °C/W) are critical.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 33 V at 5 mA test current, exhibiting a temperature coefficient near +0.055 %/°C (inferred from Fig. 3 at ~33 V). Its low 65 Ω dynamic impedance ensures minimal output voltage variation under load transients.
The SOD323F package enables automated surface-mount assembly and delivers 250 °C/W junction-to-ambient thermal resistance when mounted on a 10 mm × 10 mm copper pad. Cathode identification is via a molded band, and terminals use matte tin annealed over copper alloy for reliable solderability per MIL-STD-202.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 31.49–33.11 V @ IZT = 5 mA - defines precise regulation window for reference design |
| Power Dissipation (PD) | 500 mW on FR-4 PCB - sets maximum continuous power handling without derating below 25°C |
| Zener Impedance (ZZT) | ≤65 Ω @ f = 1 kHz - ensures <1.5% output deviation under 1 mA load step |
| Reverse Leakage (IR) | 0.07 µA @ VR = 29.9 V - guarantees negligible current draw in standby bias networks |
| Thermal Resistance (RθJA) | 250 °C/W - determines junction temperature rise under 500 mW load on standard PCB layout |
| Package | SOD323F - 2-pin surface-mount outline with 0.25–0.35 mm lead width and 2.3–2.7 mm height |
| Forward Voltage (VF) | 0.9 V @ IF = 10 mA - relevant for polarity-check or ESD protection configuration |
Pinout & Package
Package: SOD323F - ultra-compact plastic-molded surface-mount package with cathode band marking, 0.004 g mass, and UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system GND or low-impedance return path; forms cathode-referenced regulation point |
| Cathode | Zener output node | Provides regulated 33 V output; marked by molded band; connects to load or feedback network |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±1.5% (31.49–33.11 V) - enables single-supply 3.3 V ADC reference scaling without trimming |
| Low dynamic impedance | 65 Ω max - maintains <0.1 V output shift across 0–1 mA load range in sensor biasing |
| Automated assembly compatibility | SOD323F footprint with J-STD-020 Level 1 moisture sensitivity - supports high-yield reflow without baking |
| Green material compliance | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) - meets automotive environmental requirements |
| Thermal performance | 250 °C/W RθJA on 10 mm × 10 mm pad - allows 500 mW operation up to +85°C ambient without derating |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Providing stable 33 V reference for bridge sensor excitation and op-amp biasing in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Precision voltage reference source for analog front-end circuitry. Use Value: Tight 1.5% VZ tolerance eliminates need for post-calibration trimming, reducing manufacturing cost. |
Use Scenario: Regulating supply to LIN bus transceiver bias circuitry in door module ECUs operating across -40°C to +125°C. IC Role / Device Role / Timing Role: Stable voltage clamp for internal LDO input stage protection. Use Value: Low 0.07 µA leakage at 29.9 V prevents battery drain during vehicle sleep mode. |
| Portable Instrumentation Power Management | Medical Diagnostic Equipment Reference |
|
Use Scenario: Generating clean 33 V rail for photodiode TIA feedback in handheld blood oximeters powered by coin cells. IC Role / Device Role / Timing Role: Low-noise voltage reference for analog signal chain integrity. Use Value: 65 Ω zener impedance minimizes noise coupling into high-gain amplification stages. |
Use Scenario: Calibrating ADC reference voltage in ultrasound probe front-end boards requiring traceable metrology. IC Role / Device Role / Timing Role: Primary voltage standard for NIST-traceable calibration routines. Use Value: Documented ±1.5% VZ tolerance and <0.055 %/°C TC support ISO 13485 validation protocols. |
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-C33-7-F | 33 V ±5% tolerance, 300 mW PD, 80 Ω ZZT, SOT-23 package | Higher power derating required above 60°C; less suitable for high-accuracy calibration | Select when cost sensitivity outweighs VZ tolerance and thermal performance needs |
| MMSZ5256ET1G | 33 V ±5%, 500 mW, 80 Ω ZZT, SOD-123 package, higher RθJA (~350 °C/W) | Larger footprint and inferior thermal response limits use in dense PCB layouts | Choose only if SOD-123 footprint compatibility is mandatory and ambient stays ≤50°C |
Compared with BZX84-C33-7-F and MMSZ5256ET1G, DDZ33DSF-7 delivers tighter voltage tolerance, lower dynamic impedance, and superior thermal resistance in a smaller SOD323F package-making it optimal for high-precision, thermally constrained, and space-limited designs.
Availability
DDZ33DSF-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control modules, and portable instrumentation requiring stable component supply and long-term manufacturability.
Supply support for DDZ33DSF-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 industrial, automotive, and computing markets.
DDZ33DSF-7 belongs to the DDZxx(x)xSF precision Zener diode product line, engineered for voltage reference and regulation in compact, high-stability analog systems demanding tight tolerance and low thermal drift.
FAQ
What is the maximum continuous power dissipation for DDZ33DSF-7 on a standard PCB?
The DDZ33DSF-7 is rated for 500 mW power dissipation when mounted on an FR-4 PCB with a 10 mm × 10 mm copper pad and board dimensions of 35 mm × 25 mm. Derating begins linearly above +25°C ambient per the curve in Figure 1, reaching zero power at +150°C.
How is cathode polarity identified on the SOD323F package?
Cathode polarity is indicated by a molded band on the top surface of the SOD323F package, aligned with the cathode terminal. This marking is visible in the top-view diagram on page 5 of DS31987 Rev. 23-2 and conforms to JEDEC standards for surface-mount diode orientation.
Does DDZ33DSF-7 meet automotive qualification requirements?
DDZ33DSF-7 itself is not AEC-Q101 qualified; however, Diodes Incorporated offers automotive-grade variants (e.g., DDZ33DSFQ-7) manufactured in IATF 16949-certified facilities and PPAP-capable. Standard DDZ33DSF-7 is intended for industrial and commercial applications unless explicitly specified otherwise.
What is the typical temperature coefficient of DDZ33DSF-7 near its operating voltage?
Based on Figure 3 in DS31987, the temperature coefficient for a 33 V Zener is approximately +0.055 %/°C (or +18.2 mV/°C), indicating a positive drift with temperature. This value is derived from the plotted curve at the 33 V intersection and applies across the -65°C to +150°C operating range.
DDZ33DSF-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):
- 32.3 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 65 Ohms
- Current - Reverse Leakage @ Vr:
- 70 nA @ 29.9 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
DDZ33DSF-7 FAQ
1.How can I place an order for DDZ33DSF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ33DSF-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 DDZ33DSF-7 reliable?
The price and inventory of DDZ33DSF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ33DSF-7 is usually 5 days.
3.What payment methods are accepted for DDZ33DSF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ33DSF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ33DSF-7?
DDZ33DSF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ33DSF-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 DDZ33DSF-7?
For technical support, including DDZ33DSF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ33DSF-7 requirements.
6.How does Aetrix verify that DDZ33DSF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ33DSF-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 DDZ33DSF-7 meets industry standards.
7.What is the process for return or replacement of DDZ33DSF-7?
All DDZ33DSF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ33DSF-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 DDZ33DSF-7 part is unused and in its original packaging.
Return procedure for DDZ33DSF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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