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Diodes Incorporated DDZ33BSF-7
- Part No.:
- DDZ33BSF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ33BSF-7.pdf
- Description:
- DIODE ZENER 31.1V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:1,596
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Product details
Overview
DDZ33BSF-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 ±2.5% zener voltage tolerance (30.32–31.88 V at 5 mA), 80 Ω maximum zener impedance at 1 kHz, and 0.07 µA reverse leakage at 28.8 V. It serves as a stable voltage reference in low-power analog monitoring circuits.
For engineers reviewing the DDZ33BSF-7 datasheet, DDZ33BSF-7 pinout, DDZ33BSF-7 application, or DDZ33BSF-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, specified at IZT = 5 mA. Its temperature coefficient is +12.5 mV/°C (typical for 33 V devices per Fig. 3), enabling predictable drift compensation in reference designs.
The device uses a planar epitaxial construction with cathode band marking, optimized for automated surface-mount assembly. Its SOD323F package delivers low thermal resistance (250 °C/W) when mounted on standard FR-4 PCBs with 10 mm × 10 mm copper pads, supporting stable operation up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30.32–31.88 V at 5 mA - defines precise clamping/reference level for 33 V rail regulation |
| Power Dissipation (PD) | 500 mW on FR-4 - supports continuous operation without heatsinking in compact layouts |
| Zener Impedance (ZZT) | ≤80 Ω at 1 kHz - ensures minimal AC ripple coupling into reference nodes |
| Reverse Leakage (IR) | ≤0.07 µA at 28.8 V - enables ultra-low standby current in battery-backed systems |
| Thermal Resistance (RθJA) | 250 °C/W - allows accurate derating using ambient temperature and power data (Fig. 1) |
| Operating Temperature | −65 to +150 °C - qualified for under-hood automotive and industrial environments |
Pinout & Package
Package: SOD323F - ultra-small plastic surface-mount package (2.50 mm × 1.25 mm × 0.95 mm), molded with halogen-free green compound, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during normal bias; used for polarity identification via cathode band |
| Cathode | Zener breakdown terminal | Connected to higher-potential node; reverse-biased to establish stable reference voltage |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage reference | ±2.5% VZ tolerance enables <1% system-level reference error without trimming |
| Automated assembly compatibility | SOD323F footprint and matte tin finish ensure reliable reflow soldering and zero tombstoning risk |
| Low thermal resistance | 250 °C/W RθJA allows full 500 mW rating on standard PCBs without thermal relief compromises |
| Green compliance | Halogen- and antimony-free, RoHS 3 compliant - meets automotive PPAP and IATF 16949 requirements |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Stabilizing ADC reference voltage for temperature/humidity sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Precision voltage reference for 12-bit SAR ADC, replacing bulkier TL431-based solutions. Use Value: Enables ±0.5% measurement accuracy over −40 to +85 °C ambient, with no calibration required due to tight VZ tolerance. |
Use Scenario: Overvoltage protection and supply rail monitoring in door module microcontroller power domains. IC Role / Device Role / Timing Role: Clamping diode for 33 V LIN bus transceiver supply line against load dump transients. Use Value: Limits transient voltage to ≤32 V with <80 Ω dynamic impedance, preventing MCU brownout during 12 V system surges. |
| Portable Medical Instrumentation | Energy Meter Reference Subsystem |
|
Use Scenario: Providing stable bias for op-amp front-end amplifiers in handheld ECG analyzers. IC Role / Device Role / Timing Role: Low-noise voltage reference for instrumentation amplifier gain-setting network. Use Value: Delivers <0.5 µV/°C drift contribution and <0.07 µA leakage, extending single-cell Li-ion battery life by >15% vs. generic Zeners. |
Use Scenario: Calibrating shunt-based current sensing in Class 0.5 smart electricity meters. IC Role / Device Role / Timing Role: Primary reference source for metrology ADC, traceable to national standards. Use Value: Maintains ±0.2% long-term stability over 10-year field life due to low TC and hermetic-equivalent packaging. |
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 | ±5% VZ tolerance (31.35–34.65 V), 350 mW rating, SOT-23 package | Higher power dissipation margin but looser regulation; requires board area increase | Select when cost sensitivity outweighs reference accuracy needs |
| MMSZ5256B-7-F | ±5% VZ tolerance (31.35–34.65 V), 500 mW rating, SOD-123 package | Larger footprint (2.7 × 1.4 mm) and 350 °C/W RθJA; less suitable for high-density layouts | Choose if legacy SOD-123 footprint compatibility is mandatory |
Compared with BZX84-C33-7-F and MMSZ5256B-7-F, DDZ33BSF-7 offers superior voltage accuracy (±2.5% vs. ±5%) and thermal performance (250 vs. ≥350 °C/W), making it optimal for high-precision, space-constrained applications where reference stability directly impacts measurement fidelity.
Availability
DDZ33BSF-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control modules, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for DDZ33BSF-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
This device belongs to Diodes' DDZxxBSF precision Zener series, engineered specifically for high-accuracy voltage reference and regulation in automotive, industrial, and medical applications demanding tight tolerance and robust thermal performance.
FAQ
What is the exact zener voltage range for DDZ33BSF-7 at 5 mA?
The zener voltage is guaranteed between 30.32 V and 31.88 V when tested at IZT = 5 mA and TA = +25 °C, per Electrical Characteristics Table on page 3 of DS31987 Rev. 23-2. This 2.5% tolerance is measured within 40 ms of power application to minimize self-heating effects.
Can DDZ33BSF-7 be used in automotive AEC-Q101 qualified designs?
Yes - DDZ33BSF-7 is manufactured in IATF 16949 certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101 in this datasheet, Diodes confirms its suitability for automotive applications requiring change control; formal qualification can be initiated upon customer request.
What is the recommended PCB pad layout for SOD323F mounting?
The official Diodes-recommended pad layout specifies G = 1.280 mm, X = 0.710 mm, X1 = 2.700 mm, and Y = 0.403 mm (all in mm), per page 5 of DS31987. These dimensions ensure optimal solder joint reliability and thermal transfer for the 500 mW rating on FR-4 boards.
How does the temperature coefficient affect reference stability over −40 to +125 °C?
Per Figure 3 in DS31987, a 33 V Zener exhibits a typical temperature coefficient of +12.5 mV/°C. Over a 165 °C range, this yields ~2.06 V total drift - compensated in practice by pairing with negative-TC components or using trimmed resistor networks in precision references.
DDZ33BSF-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):
- 31.1 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 70 nA @ 28.8 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
DDZ33BSF-7 FAQ
1.How can I place an order for DDZ33BSF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ33BSF-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 DDZ33BSF-7 reliable?
The price and inventory of DDZ33BSF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ33BSF-7 is usually 5 days.
3.What payment methods are accepted for DDZ33BSF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ33BSF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ33BSF-7?
DDZ33BSF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ33BSF-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 DDZ33BSF-7?
For technical support, including DDZ33BSF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ33BSF-7 requirements.
6.How does Aetrix verify that DDZ33BSF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ33BSF-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 DDZ33BSF-7 meets industry standards.
7.What is the process for return or replacement of DDZ33BSF-7?
All DDZ33BSF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ33BSF-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 DDZ33BSF-7 part is unused and in its original packaging.
Return procedure for DDZ33BSF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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