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Diodes Incorporated DDZ8V2ASF-7
- Part No.:
- DDZ8V2ASF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ8V2ASF-7.pdf
- Description:
- DIODE ZENER 7.73V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
DDZ8V2ASF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage 7.73 V (min 7.53 V, max 7.92 V) at 20 mA test current, 30 Ω dynamic impedance, and ±5% tolerance. It provides stable voltage reference in low-power analog circuits, power supply feedback loops, and overvoltage protection for microcontroller I/O pins on FR-4 PCBs.
For engineers reviewing the DDZ8V2ASF-7 datasheet, DDZ8V2ASF-7 pinout, DDZ8V2ASF-7 application, or DDZ8V2ASF-7 equivalent, this part is selected for precision voltage regulation where tight VZ tolerance, low ZZT, and automotive-grade reliability under +150°C operation are required - especially in space-constrained SOD323F layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its cathode-anode terminals. Its 30 Ω zener impedance at 20 mA ensures minimal voltage deviation under load variation, while its -65°C to +150°C operating range supports industrial and automotive ambient conditions.
The device uses a silicon junction optimized for low temperature coefficient near 8.2 V (≈+3.5 mV/°C), and its 500 mW power rating is validated on standard FR-4 with 10 mm × 10 mm copper pad - not derated until ambient exceeds +70°C per the published power derating curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.53–7.92 V at IZT = 20 mA - defines usable reference window for ±2.5% tolerance design margin |
| Zener Impedance (ZZT) | 30 Ω at f = 1 kHz - limits output voltage shift to ≤0.6 V under ±20 mA load change |
| Power Dissipation (PD) | 500 mW on FR-4 PCB - supports continuous operation up to 70°C ambient before thermal derating begins |
| Reverse Leakage (IR) | 7.5 µA at VR = 7.15 V - ensures negligible current draw in standby regulation or sensing paths |
| Thermal Resistance (RθJA) | 250 °C/W - enables junction temperature rise of 125°C above ambient at full 500 mW dissipation |
| Operating Temperature | -65°C to +150°C - qualified for under-hood automotive and industrial control environments |
| Package | SOD323F - 1.25 mm × 1.70 mm footprint with cathode band marking and matte tin finish for lead-free reflow |
Pinout & Package
Package: SOD323F - ultra-small plastic surface-mount package with molded "green" compound (UL 94V-0), 0.004 g mass, and moisture sensitivity level 1. Cathode identified by band marking; terminals are matte tin annealed over copper alloy leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system GND or low-impedance return path; establishes reference potential for VZ measurement |
| Cathode | Regulated output node | Delivers stable 7.73 V reference when reverse-biased; must be decoupled with ≥100 nF capacitor for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±2.5% (7.53–7.92 V) - eliminates need for external trimming in mid-accuracy voltage references |
| Low dynamic impedance | 30 Ω at 20 mA - maintains regulation stability across varying load currents in feedback networks |
| Automotive-ready construction | AEC-Q200 compliant materials and IATF 16949 manufacturing - supports PPAP-capable supply for Tier-1 systems |
| Lead-free & halogen-free | RoHS 3 (2015/863/EU) and "Green" certified (<900 ppm Br/Cl, <1000 ppm Sb) - meets global environmental compliance mandates |
| High-temperature operation | Rated to +150°C junction - enables use in engine control units and power converters without derating penalties |
Applications
| Power Supply Feedback | Microcontroller I/O Protection |
|---|---|
|
Use Scenario: Regulating output voltage of a 12 V DC-DC buck converter using TL431-like feedback topology. IC Role / Device Role / Timing Role: Provides precise 7.73 V reference to comparator input, enabling ±1% output accuracy. Use Value: Replaces larger TO-92 Zeners with identical regulation performance in 60% less board area. |
Use Scenario: Clamping 5 V logic signals to prevent overvoltage damage to STM32 GPIO pins. IC Role / Device Role / Timing Role: Acts as shunt limiter, conducting only when transient exceeds 7.92 V. Use Value: Limits clamping voltage to safe margin below MCU absolute maximum rating (8 V), with <10 ns response. |
| Industrial Sensor Reference | Automotive Cabin Control |
|
Use Scenario: Supplying stable bias voltage to a 4–20 mA current-loop transmitter IC. IC Role / Device Role / Timing Role: Delivers low-drift reference for DAC output scaling and current-sense amplifier offset correction. Use Value: Maintains <±0.5% reference error over -40°C to +85°C due to matched TC and low ZZT. |
Use Scenario: Voltage monitoring in HVAC control module detecting battery undervoltage (9–16 V range). IC Role / Device Role / Timing Role: Forms threshold detector with comparator; triggers warning at 7.53 V to indicate 12 V rail degradation. Use Value: Survives 150°C under-hood environment and passes AEC-Q200 thermal cycling without parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C8V2LT1G | 8.2 V nominal, ±5% tolerance (8.2–8.6 V), 30 Ω ZZT, SOT-23 package | Larger footprint (2.9 mm × 1.3 mm vs. 1.7 mm × 1.25 mm); higher RθJA (350 °C/W) | Select when existing SOT-23 layout prohibits SOD323F rework but tighter VZ tolerance is not required. |
| MMSZ5233B-7-F | 8.2 V nominal, ±5% tolerance, 35 Ω ZZT, SOD-123 package | Higher power rating (500 mW same), but wider VZ spread (7.79–8.61 V) and no AEC-Q200 qualification | Choose for cost-sensitive consumer designs where automotive qualification and ±2.5% tolerance are unnecessary. |
Compared with BZX84-C8V2LT1G and MMSZ5233B-7-F, DDZ8V2ASF-7 delivers superior voltage accuracy (±2.5% vs. ±5%), smaller footprint, lower thermal resistance, and formal AEC-Q200 readiness - making it optimal for space-constrained, high-reliability applications.
Availability
DDZ8V2ASF-7 is available at Aetrix Electronics and suitable for power supply feedback, microcontroller I/O protection, industrial sensor reference, and automotive cabin control requiring stable component supply across extended temperature ranges and RoHS-compliant manufacturing.
Supply support for DDZ8V2ASF-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 the DDZxxASF/BSF/CSF/DSF precision Zener family, engineered for high-accuracy voltage reference and regulation in automotive, industrial, and communications systems where tight tolerance and thermal stability are critical.
FAQ
What is the maximum continuous reverse current the DDZ8V2ASF-7 can handle without degradation?
The device is rated for 20 mA zener test current (IZT) and supports continuous operation up to its 500 mW power limit. At 7.73 V, this corresponds to ~64.7 mA maximum average reverse current. Exceeding this value risks thermal runaway unless board-level heatsinking is implemented per the 10 mm × 10 mm pad specification.
Does the DDZ8V2ASF-7 have AEC-Q200 qualification documentation available?
While the DDZ8V2ASF-7 itself is not individually listed in AEC-Q200 reports, it is manufactured in IATF 16949-certified facilities using AEC-Q200-compliant materials and processes. Diodes Incorporated confirms suitability for automotive applications requiring change control and PPAP capability - full qualification data is available upon request through authorized channels.
How does the SOD323F package affect solder joint reliability during reflow?
The SOD323F uses matte tin annealed terminals compatible with standard lead-free reflow profiles (peak 260°C). Its low mass (0.004 g) and symmetric leadframe minimize warpage risk. IPC-J-STD-020 Level 1 moisture sensitivity allows floor life unlimited at ≤30°C/60% RH, eliminating bake requirements prior to assembly.
Can DDZ8V2ASF-7 replace DDZ8V2BSF in an existing design?
Yes - both share identical SOD323F package, electrical specs (VZ, ZZT, PD), and thermal characteristics. The "ASF" suffix denotes tighter initial VZ tolerance (±2.5% vs. ±3.5% for BSF), so substitution improves reference accuracy without layout or thermal changes.
DDZ8V2ASF-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):
- 7.73 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 7.15 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
DDZ8V2ASF-7 FAQ
1.How can I place an order for DDZ8V2ASF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ8V2ASF-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 DDZ8V2ASF-7 reliable?
The price and inventory of DDZ8V2ASF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ8V2ASF-7 is usually 5 days.
3.What payment methods are accepted for DDZ8V2ASF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ8V2ASF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ8V2ASF-7?
DDZ8V2ASF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ8V2ASF-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 DDZ8V2ASF-7?
For technical support, including DDZ8V2ASF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ8V2ASF-7 requirements.
6.How does Aetrix verify that DDZ8V2ASF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ8V2ASF-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 DDZ8V2ASF-7 meets industry standards.
7.What is the process for return or replacement of DDZ8V2ASF-7?
All DDZ8V2ASF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ8V2ASF-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 DDZ8V2ASF-7 part is unused and in its original packaging.
Return procedure for DDZ8V2ASF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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