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Diodes Incorporated DDZ3V0ASF-7
- Part No.:
- DDZ3V0ASF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ3V0ASF-7.pdf
- Description:
- DIODE ZENER 2.96V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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Product details
Overview
DDZ3V0ASF-7 from Diodes Incorporated is a precision 3.0 V Zener diode in SOD323F package, designed for voltage regulation and reference applications with ±3.6% tolerance (2.85–3.07 V at 20 mA), 120 Ω dynamic impedance, and 50 µA reverse leakage at 1 V. It delivers stable 3.0 V reference in low-power analog circuits, sensor biasing, and overvoltage protection on FR-4 PCBs.
For engineers reviewing the DDZ3V0ASF-7 datasheet, DDZ3V0ASF-7 pinout, DDZ3V0ASF-7 application, or DDZ3V0ASF-7 equivalent, this page provides verified electrical parameters, thermal derating behavior, SOD323F terminal mapping, automotive-grade packaging compliance, and direct alternatives for 3.0 V Zener reference design.
Technical Context
This Zener diode operates in reverse breakdown to maintain a precise DC reference voltage under controlled current conditions. Its 20 mA test current ensures stable VZ measurement with minimal self-heating, and its 120 Ω Zener impedance reflects low AC voltage variation across load changes.
The device uses a planar silicon junction optimized for tight VZ distribution and low temperature coefficient (≈−2 mV/°C near 3.0 V, per Fig. 3). It is rated for −65°C to +150°C operation and exhibits 500 mW power dissipation on standard FR-4 board layout with defined pad dimensions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.85–3.07 V at IZT = 20 mA - defines usable reference window for precision analog circuits |
| Zener Impedance (ZZT) | 120 Ω at f = 1 kHz - limits AC ripple coupling into reference node |
| Reverse Leakage (IR) | 50 µA at VR = 1 V - determines minimum bias current needed to avoid forward conduction in series-reference topologies |
| Power Dissipation (PD) | 500 mW on FR-4 (10 mm × 10 mm pad) - sets maximum continuous current (IZ ≤ 166 mA at 3.0 V) |
| Thermal Resistance (RθJA) | 250 °C/W - requires ambient derating above 75°C per Fig. 1 (e.g., 375 mW at +100°C) |
| Package | SOD323F - 2-pin surface-mount outline with cathode band marking and 0.004 g mass |
| RoHS & Green Compliance | Fully lead-free, halogen- and antimony-free per Diodes' "Green" definition (<900 ppm Br/Cl, <1000 ppm Sb) |
Pinout & Package
Package: SOD323F - ultra-small plastic molded case (2.50 mm × 1.70 mm × 1.25 mm), moisture sensitivity level 1, matte tin-plated copper alloy leadframe, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system GND or lowest potential point in shunt regulator configuration |
| Cathode | Regulated output node | Provides stabilized 3.0 V when reverse-biased; connects to load and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±3.6% (2.85–3.07 V) enables accurate 3.0 V reference without post-calibration in cost-sensitive designs |
| Low Zener impedance | 120 Ω at 1 kHz supports stable reference under varying load currents up to ±5 mA |
| Automated assembly compatibility | SOD323F footprint and matte tin finish ensure reliable reflow soldering and AOI inspection |
| High-temperature operation | Rated for −65°C to +150°C ambient enables use in under-hood automotive and industrial environments |
Applications
| Temperature Sensor Biasing | USB Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable excitation voltage to thermistor or RTD bridges in HVAC control modules. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed 3.0 V bias point for ratiometric ADC measurements. Use Value: Tight 2.85–3.07 V tolerance minimizes gain error in bridge output scaling; 120 Ω ZZT prevents drift under sensor current variations. |
Use Scenario: Clamping transient surges on USB 2.0 D+ line during hot-plug events. IC Role / Device Role / Timing Role: Low-capacitance shunt protector limiting voltage to ≤3.3 V while preserving signal integrity. Use Value: 50 µA leakage at 1 V avoids loading high-impedance data lines; SOD323F size fits dense USB connector layouts. |
| Industrial PLC Analog Input Reference | Low-Power MCU Reset Circuit |
|
Use Scenario: Generating reference for 12-bit SAR ADC in programmable logic controller analog input modules. IC Role / Device Role / Timing Role: Precision voltage source for ADC internal reference or external buffer amplifier bias. Use Value: 250 °C/W RθJA allows operation at 85°C ambient with full 500 mW rating; RoHS/Green compliance meets industrial environmental standards. |
Use Scenario: Setting threshold for discrete reset supervisor circuit in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Zener-based comparator reference enabling brown-out detection at ~3.0 V. Use Value: 20 mA test current aligns with typical reset IC input current requirements; SOD323F enables compact two-resistor + Zener reset topology. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3.0 V Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V0 (ON Semiconductor) | VZ = 2.8–3.2 V (±6.7%), ZZT = 90 Ω, PD = 350 mW, SOT-23 package | Higher tolerance and lower power rating limit use in high-stability or high-current reference roles | Select when SOT-23 footprint is required and ±6.7% VZ is acceptable |
| MMSZ4677 (Diodes Inc.) | VZ = 2.85–3.15 V (±5.0%), ZZT = 150 Ω, PD = 500 mW, SOD-123 package | Larger SOD-123 footprint and higher ZZT reduce board density and increase reference noise | Choose only if SOD-123 is already standardized in legacy designs and tighter impedance is not critical |
Compared with BZX84-C3V0 and MMSZ4677, DDZ3V0ASF-7 offers the narrowest VZ tolerance (±3.6%) and smallest footprint (SOD323F) among 3.0 V Zeners with 500 mW rating, making it optimal for space-constrained, high-accuracy analog references.
Availability
DDZ3V0ASF-7 is available at Aetrix Electronics and suitable for temperature sensor biasing, USB port overvoltage clamping, and industrial PLC analog input reference requiring stable component supply, long-lifecycle support, and automotive-qualified packaging.
Supply support for DDZ3V0ASF-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.
This part belongs to the DDZxVxASF/BSF precision Zener family, engineered for tight-tolerance voltage reference in automated SMT production and harsh-environment applications.
FAQ
What is the maximum continuous Zener current for DDZ3V0ASF-7 at 25°C?
The maximum continuous Zener current is calculated from its 500 mW power rating and nominal 3.0 V Zener voltage: IZ(max) = 500 mW ÷ 3.0 V ≈ 167 mA. However, thermal derating applies above 75°C ambient (per Fig. 1), reducing allowable current to 125 mA at 100°C and 83 mA at 125°C.
Does DDZ3V0ASF-7 meet AEC-Q101 qualification for automotive use?
DDZ3V0ASF-7 is manufactured in IATF 16949 certified facilities and supports PPAP documentation, but it is not explicitly listed as AEC-Q101 qualified in DS31987 Rev. 23–2. For automotive applications requiring formal AEC-Q101 certification, contact Diodes Incorporated directly to confirm qualification status and change control process.
How does the SOD323F package affect thermal performance compared to SOD-123?
SOD323F has higher thermal resistance (RθJA = 250 °C/W) than SOD-123 (typically ~200 °C/W) due to smaller pad area and reduced copper exposure. This results in ~12.5°C higher junction temperature at identical power dissipation, requiring stricter ambient temperature limits or reduced operating current in thermally constrained layouts.
Can DDZ3V0ASF-7 be used in series with another Zener to achieve higher reference voltage?
Yes - stacking multiple DDZ3V0ASF-7 devices in series yields additive Zener voltages (e.g., two in series ≈ 6.0 V), but total tolerance accumulates (±5.1% for two units), and dynamic impedance sums linearly (240 Ω). Ensure current-limiting resistor accounts for combined VZ and verify thermal margin for total power dissipation.
DDZ3V0ASF-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):
- 2.96 V
- Tolerance:
- ±3.72%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 120 Ohms
- Current - Reverse Leakage @ Vr:
- 50 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
DDZ3V0ASF-7 FAQ
1.How can I place an order for DDZ3V0ASF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ3V0ASF-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 DDZ3V0ASF-7 reliable?
The price and inventory of DDZ3V0ASF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ3V0ASF-7 is usually 5 days.
3.What payment methods are accepted for DDZ3V0ASF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ3V0ASF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ3V0ASF-7?
DDZ3V0ASF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ3V0ASF-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 DDZ3V0ASF-7?
For technical support, including DDZ3V0ASF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ3V0ASF-7 requirements.
6.How does Aetrix verify that DDZ3V0ASF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ3V0ASF-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 DDZ3V0ASF-7 meets industry standards.
7.What is the process for return or replacement of DDZ3V0ASF-7?
All DDZ3V0ASF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ3V0ASF-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 DDZ3V0ASF-7 part is unused and in its original packaging.
Return procedure for DDZ3V0ASF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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