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Diodes Incorporated DDZ33ASF-7
- Part No.:
- DDZ33ASF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ33ASF-7.pdf
- Description:
- DIODE ZENER 30.45V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:3,503
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Product details
Overview
DDZ33ASF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage of 33V (min 29.68V, max 31.22V at IZT = 5mA), 80Ω maximum zener impedance at 1kHz, and <0.07µA reverse leakage at 28.2V. It operates across –65°C to +150°C, features SOD323F package with cathode band marking, and is used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the DDZ33ASF-7 datasheet, DDZ33ASF-7 pinout, DDZ33ASF-7 application, or DDZ33ASF-7 equivalent, this part serves as a stable, RoHS-compliant, automotive-grade–capable voltage reference where tight VZ tolerance (±2.4%), low thermal resistance (250°C/W), and high-temperature reliability are required.
Technical Context
This Zener diode delivers precise voltage regulation via controlled reverse-breakdown operation, with specified test conditions at IZT = 5mA and pulse measurement (<40ms) to minimize self-heating. Its temperature coefficient is optimized near 33V (≈+12 mV/°C per Fig. 3), enabling predictable drift compensation in reference designs.
The device uses a copper alloy leadframe with matte tin annealed finish, rated for solderability per MIL-STD-202 Method 208, and achieves moisture sensitivity Level 1 per J-STD-020 - confirming suitability for standard reflow and automated assembly without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 29.68–31.22 V at IZT = 5 mA - defines stable regulation point with ±2.4% tolerance for precision biasing |
| Power Dissipation (PD) | 500 mW on FR-4 PCB - supports continuous operation up to 500mW with defined thermal pad layout |
| Zener Impedance (ZZT) | ≤80 Ω at f = 1 kHz - ensures minimal output voltage variation under dynamic load changes |
| Reverse Leakage (IR) | <0.07 µA at VR = 28.2 V - guarantees negligible current draw in standby/reference mode |
| Thermal Resistance (RθJA) | 250 °C/W - enables thermal design with known junction-to-ambient rise under 500mW load |
| Operating Temperature | –65°C to +150°C - validated for extended industrial and under-hood automotive environments |
| Package | SOD323F - ultra-small 1.25 × 1.70 mm surface-mount outline compatible with high-density PCB layouts |
Pinout & Package
Package: SOD323F - molded plastic, halogen- and antimony-free "Green" compound, UL 94V-0 rated, weight ≈0.004 g. Cathode identified by band marking on top view.
| 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 | Zener breakdown terminal / regulated output node | Provides stable 33V reference when reverse-biased; marked with cathode band |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±2.4% (29.68–31.22 V) - reduces need for external trimming in voltage reference circuits |
| Low zener impedance | ≤80 Ω at 1 kHz - maintains regulation stability under varying load currents |
| Automated assembly compatibility | SOD323F footprint with matte tin annealed terminals - ensures reliable solder joint formation in reflow processes |
| Environmental compliance | Fully RoHS 3 compliant, halogen- and antimony-free - meets global regulatory requirements for end-product certification |
| High-temperature operation | Rated to +150°C junction temperature - supports use in engine control units and industrial power supplies |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module Reference |
|---|---|
|
Use Scenario: Providing stable bias voltage for op-amp input stages in 4–20 mA transmitter circuits operating in factory-floor environments. IC Role / Device Role / Timing Role: Precision voltage reference for analog front-end calibration and ADC reference scaling. Use Value: Tight VZ tolerance and low tempco ensure <±0.5% reference drift over –40°C to +85°C ambient. |
Use Scenario: Supplying regulated 33V reference to microcontroller ADC and CAN transceiver bias networks in BCMs. IC Role / Device Role / Timing Role: Zener-based voltage clamp and reference generator for mixed-signal subsystems. Use Value: AEC-Q200 readiness and 150°C rating allow direct integration into non-safety-critical automotive modules without derating. |
| Programmable Logic Controller Input Protection | Medical Instrument Power Sequencing |
|
Use Scenario: Clamping transient overvoltage on 24V digital input channels exposed to inductive switching noise. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as shunt overvoltage protector with fast response. Use Value: 80Ω ZZT and 500mW rating enable robust clamping without thermal runaway during repetitive surges. |
Use Scenario: Generating clean 33V auxiliary rail for FPGA configuration memory and clock buffer ICs during cold-start sequencing. IC Role / Device Role / Timing Role: Low-noise DC reference source for power supply enable thresholds and reset timing. Use Value: Sub-0.1µA leakage at 28.2V prevents unintended wake-up or false resets during standby modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C33-7-F | 33V ±5% tolerance, 300mW PD, SOT-23 package, 100Ω ZZT | Higher power dissipation margin not required; less stringent VZ spec acceptable | Select when cost sensitivity outweighs precision and thermal performance needs |
| MMSZ5256ET1G | 33V ±5%, 500mW, SOD-123, 100Ω ZZT, 100ppm/°C tempco | Larger footprint, higher impedance, wider tempco limits high-accuracy reference use | Choose only if SOD-123 is already standardized in legacy board designs |
Compared with BZX84-C33-7-F and MMSZ5256ET1G, DDZ33ASF-7 offers tighter voltage tolerance, lower zener impedance, and superior thermal performance in a smaller SOD323F package - making it optimal for space-constrained, high-stability reference applications.
Availability
DDZ33ASF-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control modules, programmable logic controller input protection, and medical instrument power sequencing requiring stable component supply across extended temperature ranges.
Supply support for DDZ33ASF-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.
This device belongs to the DDZxxASF–DDZxxDSF precision Zener family, engineered for low-drift voltage reference and regulation in compact, thermally demanding applications where tight tolerance and long-term stability are critical.
FAQ
What is the maximum continuous reverse current the DDZ33ASF-7 can sustain without degradation?
The DDZ33ASF-7 is rated for 500 mW power dissipation at 25°C ambient on FR-4 PCB with specified pad layout. At its nominal 33V zener voltage, this corresponds to ~15.2 mA continuous reverse current (PD/VZ). Derating per Fig. 1 applies above 25°C - e.g., ~10 mA at 85°C ambient. Exceeding these limits risks thermal runaway and parametric shift.
Does the DDZ33ASF-7 meet AEC-Q200 requirements for automotive use?
DDZ33ASF-7 is manufactured in IATF 16949 certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q200 in this specific variant, Diodes Incorporated confirms it is designed for automotive applications requiring change control - qualification testing can be initiated upon customer request with full traceability and process validation.
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. SOD-123's 2.7 × 1.6 mm) but achieves identical 250°C/W RθJA due to optimized copper leadframe geometry and thermal pad design. Its lower mass requires stricter reflow profile control to avoid tombstoning, but delivers equal thermal capability in space-constrained layouts.
Can DDZ33ASF-7 replace DDZ33BSF in an existing design?
Yes - both share identical SOD323F package, 33V nominal range, and electrical specs except for tighter tolerance: DDZ33ASF-7 (±2.4%) vs. DDZ33BSF (±2.9%). No layout or thermal changes are needed. The ASF variant improves reference accuracy without altering circuit behavior, making it a direct upgrade for higher-precision applications.
DDZ33ASF-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 30.45 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 70 nA @ 28.2 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
DDZ33ASF-7 FAQ
1.How can I place an order for DDZ33ASF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ33ASF-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 DDZ33ASF-7 reliable?
The price and inventory of DDZ33ASF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ33ASF-7 is usually 5 days.
3.What payment methods are accepted for DDZ33ASF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ33ASF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ33ASF-7?
DDZ33ASF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ33ASF-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 DDZ33ASF-7?
For technical support, including DDZ33ASF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ33ASF-7 requirements.
6.How does Aetrix verify that DDZ33ASF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ33ASF-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 DDZ33ASF-7 meets industry standards.
7.What is the process for return or replacement of DDZ33ASF-7?
All DDZ33ASF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ33ASF-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 DDZ33ASF-7 part is unused and in its original packaging.
Return procedure for DDZ33ASF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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