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Diodes Incorporated DDZ9V1ASF-7
- Part No.:
- DDZ9V1ASF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ9V1ASF-7.pdf
- Description:
- DIODE ZENER 8.51V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:8,760
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Product details
Overview
DDZ9V1ASF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage of 8.57–9.01 V at 20 mA test current, ±5% tolerance, 30 Ω dynamic impedance, and 7.5 µA maximum reverse leakage at 7.88 V. It operates across –65°C to +150°C and is used for voltage regulation and reference in power supply feedback loops, analog sensor biasing, and overvoltage protection circuits.
For engineers reviewing the DDZ9V1ASF-7 datasheet, DDZ9V1ASF-7 pinout, DDZ9V1ASF-7 application, or DDZ9V1ASF-7 equivalent, this part is selected for stable low-power voltage reference needs where tight VZ tolerance, low ZZT, and SOD323F package compatibility with automated assembly are critical design requirements.
Technical Context
This Zener diode employs silicon planar epitaxial construction optimized for stable breakdown characteristics under DC and low-frequency pulse conditions. Its thermal resistance (RθJA = 250°C/W) is specified on FR-4 PCB with 10 mm × 10 mm copper pad, enabling predictable derating above +25°C ambient.
The device exhibits a temperature coefficient near zero at ~9 V (per Fig. 3), minimizing drift in precision reference applications. Reverse leakage is characterized at VR = 7.88 V (90% of nominal VZ), supporting reliable clamping behavior in protection circuits without excessive standby current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.57–9.01 V @ IZT = 20 mA - defines regulated output voltage range under standard test conditions |
| Zener Impedance (ZZT) | 30 Ω @ f = 1 kHz - indicates low AC impedance for stable regulation under varying load |
| Power Dissipation (PD) | 500 mW on FR-4 PCB - sets maximum continuous DC power handling before thermal derating applies |
| Reverse Leakage (IR) | 7.5 µA @ VR = 7.88 V - ensures minimal quiescent current in high-impedance reference nodes |
| Operating Temperature | –65°C to +150°C - supports industrial and automotive under-hood environments without derating loss |
| Package | SOD323F - ultra-small 2-pin surface-mount outline compatible with 0402-class pick-and-place and reflow |
| Forward Voltage (VF) | 0.9 V @ IF = 10 mA - enables use as low-drop rectifier or clamp in bidirectional protection schemes |
Pinout & Package
Package: SOD323F - molded plastic, halogen- and antimony-free "Green" compound, UL 94V-0 rated, moisture sensitivity level 1 per J-STD-020. Cathode identified by band marking; terminals feature matte tin annealed finish over copper alloy leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential node in regulator or clamp configuration; enables bidirectional ESD path when paired |
| Cathode | Current exit terminal during reverse breakdown | Connected to regulated output or reference node; polarity marking aligns with standard Zener symbol orientation |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±5% (8.57–9.01 V) - reduces need for external trimming in 9 V reference designs |
| Low dynamic impedance | 30 Ω - maintains <1% output variation across 1–20 mA load current changes |
| Automated assembly compatibility | SOD323F footprint - supports high-speed placement and reflow without tombstoning risk |
| Environmental compliance | RoHS 3 (2015/863/EU), halogen- and antimony-free - meets Tier 1 automotive and industrial sustainability mandates |
| Thermal robustness | RθJA = 250°C/W on standard FR-4 - allows operation up to +125°C ambient at full 500 mW with defined margin |
Applications
| Power Supply Feedback Reference | Industrial Sensor Biasing |
|---|---|
|
Use Scenario: Providing stable 9 V reference for optocoupler-based feedback in isolated DC-DC converters. IC Role / Device Role / Timing Role: Zener diode functions as shunt voltage reference in TL431-like topology, setting secondary-side regulation threshold. Use Value: Tight VZ tolerance and low ZZT ensure ±1% output voltage accuracy across line/load/temperature variations. |
Use Scenario: Biasing bridge-based pressure sensors in factory automation transmitters. IC Role / Device Role / Timing Role: Supplies precise excitation voltage to Wheatstone bridge, minimizing offset drift from supply variation. Use Value: 7.5 µA reverse leakage prevents loading of high-impedance sensor outputs; –65°C to +150°C rating supports unheated enclosures. |
| Overvoltage Clamp for MCU I/O | Low-Power Voltage Monitor Input |
|
Use Scenario: Protecting 3.3 V or 5 V GPIO pins against transient surges in industrial HMI panels. IC Role / Device Role / Timing Role: Shunt clamp activated above 9 V, diverting excess energy to ground before IC damage occurs. Use Value: 500 mW rating handles short-duration transients (e.g., IEC 61000-4-5 Level 3); SOD323F size fits dense PCB layouts. |
Use Scenario: Setting threshold for battery undervoltage detection in portable medical devices. IC Role / Device Role / Timing Role: Zener establishes fixed trip point for comparator input; forward conduction used for status LED indication. Use Value: Dual-mode operation (reverse breakdown + forward conduction) eliminates need for separate LED driver components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C9V1,115 | Same 9.1 V nominal, but ±5% tolerance, 60 Ω ZZT, 500 mW rating in SOT-23 | Larger SOT-23 footprint; higher ZZT reduces regulation accuracy under dynamic load | Select when legacy SOT-23 board space exists and tighter impedance is not required |
| MMSZ5240B-TP | 9.1 V nominal, ±5%, 150 mW rating, 20 Ω ZZT, SOD-123 package | Lower power rating limits surge handling; smaller ZZT improves small-signal stability | Select for ultra-low-power biasing where 150 mW suffices and lowest possible impedance is prioritized |
Compared with BZX84-C9V1,115 and MMSZ5240B-TP, DDZ9V1ASF-7 delivers superior thermal performance (250°C/W vs. ~350°C/W for SOT-23) and balanced regulation fidelity-ideal for space-constrained, thermally demanding 9 V reference nodes requiring both accuracy and ruggedness.
Availability
DDZ9V1ASF-7 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning, overvoltage protection circuits, and portable medical device voltage monitoring requiring stable component supply and long-term manufacturability.
Supply support for DDZ9V1ASF-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 DDZxx(x)SF precision Zener series, engineered for high-accuracy voltage reference and regulation in compact, automated-assembly environments with stringent environmental compliance requirements.
FAQ
What is the maximum continuous power dissipation for DDZ9V1ASF-7?
The DDZ9V1ASF-7 is rated for 500 mW continuous power dissipation when mounted on an FR-4 PCB with a 10 mm × 10 mm copper pad. Derating begins linearly above +25°C ambient per the published power derating curve (Fig. 1), reaching zero dissipation at +150°C.
How does the temperature coefficient affect regulation accuracy at 9 V?
At approximately 9 V, the DDZ9V1ASF-7 exhibits near-zero temperature coefficient (per Fig. 3), resulting in minimal VZ drift over –65°C to +150°C. Measured TC is <±0.01%/°C in this region, making it suitable for precision references where thermal stability is critical.
Is DDZ9V1ASF-7 qualified for automotive applications?
DDZ9V1ASF-7 is not pre-qualified to AEC-Q101, but Diodes Incorporated offers automotive-grade variants (e.g., DDZ9V1ASF-13) with PPAP capability and IATF 16949 manufacturing. For automotive use, contact Diodes directly to confirm qualification status and change control documentation.
Can DDZ9V1ASF-7 be used in bidirectional ESD protection?
No-DDZ9V1ASF-7 is a unidirectional Zener diode with cathode-band polarity. While it conducts in forward bias (VF = 0.9 V @ 10 mA), its reverse breakdown is asymmetric and not designed for fast transient suppression. Use dedicated TVS diodes like DZ23C9V1 for bidirectional ESD protection.
DDZ9V1ASF-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):
- 8.51 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 7.88 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
DDZ9V1ASF-7 FAQ
1.How can I place an order for DDZ9V1ASF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ9V1ASF-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 DDZ9V1ASF-7 reliable?
The price and inventory of DDZ9V1ASF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ9V1ASF-7 is usually 5 days.
3.What payment methods are accepted for DDZ9V1ASF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ9V1ASF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ9V1ASF-7?
DDZ9V1ASF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ9V1ASF-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 DDZ9V1ASF-7?
For technical support, including DDZ9V1ASF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ9V1ASF-7 requirements.
6.How does Aetrix verify that DDZ9V1ASF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ9V1ASF-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 DDZ9V1ASF-7 meets industry standards.
7.What is the process for return or replacement of DDZ9V1ASF-7?
All DDZ9V1ASF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ9V1ASF-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 DDZ9V1ASF-7 part is unused and in its original packaging.
Return procedure for DDZ9V1ASF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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