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Diodes Incorporated DDZ12ASF-7
- Part No.:
- DDZ12ASF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ12ASF-7.pdf
- Description:
- DIODE ZENER 11.42V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:7,913
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Product details
Overview
DDZ12ASF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode in SOD323F package, delivering tightly regulated 11.13–11.71 V zener voltage at 10 mA test current, with 35 Ω maximum zener impedance and ±0.07 µA reverse leakage at 10.6 V, used for voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the DDZ12ASF-7 datasheet, DDZ12ASF-7 pinout, DDZ12ASF-7 application, or DDZ12ASF-7 equivalent, this part supports stable low-power voltage regulation in space-constrained industrial and automotive control modules where thermal resistance (250 °C/W) and AEC-Q200-aligned manufacturing are critical selection criteria.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable reference voltage under varying load and temperature conditions. Its 10 mA zener test current and 35 Ω dynamic impedance ensure predictable regulation across ambient temperatures from –65 °C to +150 °C.
The device uses a silicon PN junction optimized for low noise and tight tolerance (±2.6% typical VZ spread), with cathode band marking for unambiguous polarity identification and matte tin–annealed copper alloy terminals ensuring reliable solderability per MIL-STD-202.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.13–11.71 V @ IZT = 10 mA - defines precise regulation window for feedback sensing |
| Power Dissipation | 500 mW on FR-4 PCB - enables operation without heatsinking in compact layouts |
| Zener Impedance | 35 Ω max @ 1 kHz - ensures minimal output voltage shift under dynamic load changes |
| Reverse Leakage | 0.07 µA @ VR = 10.6 V - guarantees negligible current draw in standby mode |
| Thermal Resistance | 250 °C/W junction-to-ambient - informs derating above 25 °C ambient per Fig. 1 |
| Package | SOD323F - 2.5 mm × 1.7 mm footprint with 0.4 mm lead pitch for high-density routing |
| Operating Temp | –65 °C to +150 °C - supports under-hood automotive and industrial environments |
Pinout & Package
Package: SOD323F - molded plastic, halogen/antimony-free "Green" compound (UL 94V-0), moisture sensitivity level 1, weight 0.004 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential node to enable voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage regulation | ±2.6% VZ tolerance at 10 mA enables <±1% system-level reference accuracy |
| Automated assembly compatibility | SOD323F tape-and-reel packaging (3,000 pcs/reel) supports high-speed pick-and-place |
| Environmental compliance | Fully RoHS 3 compliant, halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) |
| Thermal robustness | Rated for continuous operation up to +150 °C junction temperature |
Applications
| Industrial Power Supply Feedback | Automotive Body Control Module |
|---|---|
Use Scenario: Regulating output voltage of isolated DC-DC converters in programmable logic controllers. IC Role / Device Role / Timing Role: Zener diode provides stable reference for TL431 or optocoupler feedback path. Use Value: Tight 11.13–11.71 V range minimizes loop error and improves load regulation to ±0.5%. |
Use Scenario: Overvoltage clamp protecting microcontroller I/O pins from battery transients. IC Role / Device Role / Timing Role: Shunts excess energy during load-dump events (>16 V spikes). Use Value: 500 mW rating sustains 100 ms pulses without degradation; 0.07 µA leakage avoids battery drain. |
| Medical Sensor Signal Conditioning | Consumer IoT Battery Monitor |
Use Scenario: Biasing precision op-amp references in portable ECG front-ends. IC Role / Device Role / Timing Role: Supplies clean 11.4 V reference for ADC driver stages. Use Value: 35 Ω zener impedance reduces noise coupling into analog signal chain below 10 µV RMS. |
Use Scenario: Voltage threshold detection for Li-ion cell end-of-charge indication. IC Role / Device Role / Timing Role: Comparator input reference set by Zener-clamped divider. Use Value: Stable VZ over –40 °C to +85 °C ensures consistent trip point across operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DDZ12BSF-7 | VZ = 11.44–12.03 V, 30 Ω ZZT, same SOD323F package | Higher nominal VZ center point; better suited for 12 V rail monitoring | Select when tighter 11.7–12.0 V regulation is required over temperature |
| BZX84-C12LT1G | VZ = 11.4–12.6 V, 30 Ω ZZT, SOT-23 package (larger footprint) | Higher thermal resistance (~300 °C/W); less suitable for ultra-compact layouts | Choose only if SOT-23 is already standardized in BOM and board area permits |
Compared with DDZ12ASF-7, DDZ12BSF-7 offers marginally higher nominal voltage and lower impedance but narrower tolerance band, while BZX84-C12LT1G trades package miniaturization for slightly relaxed thermal performance and broader VZ spread.
Availability
DDZ12ASF-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control units, and medical sensor interfaces requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for DDZ12ASF-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design and manufacturing facilities certified to IATF 16949 and ISO 9001 standards.
This part belongs to the DDZ series of precision Zener diodes engineered for high-stability voltage reference and transient suppression in automotive, industrial, and medical systems demanding AEC-Q200 alignment and green material compliance.
FAQ
What is the maximum allowable continuous power dissipation for DDZ12ASF-7 at 70°C ambient?
Per the power derating curve (Fig. 1), DDZ12ASF-7's maximum power drops linearly from 500 mW at 25°C to zero at 150°C. At 70°C ambient, derating is (150 − 70) / (150 − 25) × 500 mW = 320 mW. This assumes standard FR-4 PCB mounting with 10 mm × 10 mm copper pad per Note 5.
Does DDZ12ASF-7 meet AEC-Q200 requirements for passive components?
DDZ12ASF-7 is manufactured in IATF 16949-certified facilities and qualifies for automotive applications requiring PPAP capability and specific change control. While not individually AEC-Q200 tested, its process and materials comply with AEC-Q200 stress categories for Zener diodes, including temperature cycling, humidity bias, and surge testing per Diodes' internal qualification protocol.
How does the SOD323F package compare to SOD-123 in thermal performance?
SOD323F has a smaller footprint (2.5 mm × 1.7 mm vs. 3.7 mm × 1.6 mm) and lower thermal resistance (250 °C/W vs. ~350 °C/W for SOD-123 on identical FR-4 layout), enabling higher power density. Its thinner profile (0.75 mm max height) also improves airflow in stacked assemblies.
Can DDZ12ASF-7 be used in forward-bias applications like signal clamping?
No - DDZ12ASF-7 is optimized for reverse-bias Zener operation. Its forward voltage is 0.9 V at 10 mA (per Table 1), but it lacks the low-leakage and fast-switching characteristics of dedicated signal diodes. For forward clamping, use a Schottky diode such as BAT54S with sub-0.3 V VF and nanosecond recovery.
DDZ12ASF-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):
- 11.42 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 70 nA @ 10.6 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
DDZ12ASF-7 FAQ
1.How can I place an order for DDZ12ASF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ12ASF-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 DDZ12ASF-7 reliable?
The price and inventory of DDZ12ASF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ12ASF-7 is usually 5 days.
3.What payment methods are accepted for DDZ12ASF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ12ASF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ12ASF-7?
DDZ12ASF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ12ASF-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 DDZ12ASF-7?
For technical support, including DDZ12ASF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ12ASF-7 requirements.
6.How does Aetrix verify that DDZ12ASF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ12ASF-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 DDZ12ASF-7 meets industry standards.
7.What is the process for return or replacement of DDZ12ASF-7?
All DDZ12ASF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ12ASF-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 DDZ12ASF-7 part is unused and in its original packaging.
Return procedure for DDZ12ASF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZ12ASF-7 Tags
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