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Diodes Incorporated DDZ30ASF-7
- Part No.:
- DDZ30ASF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ30ASF-7.pdf
- Description:
- DIODE ZENER 27.69V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:6,388
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Product details
Overview
DDZ30ASF-7 from Diodes Incorporated is a 0.5W surface-mount precision Zener diode in SOD323F package, delivering tightly regulated 26.99–28.39V zener voltage at 5mA test current, with 80Ω max zener impedance and ±0.07µA reverse leakage at 25.6V. It serves as a stable voltage reference or overvoltage clamp in power supply feedback loops, analog sensor conditioning circuits, and industrial I/O protection stages.
For engineers reviewing the DDZ30ASF-7 datasheet, DDZ30ASF-7 pinout, DDZ30ASF-7 application, or DDZ30ASF-7 equivalent, key selection criteria include its ±3.5% VZ tolerance at 5mA, 250°C/W thermal resistance on FR-4, -65°C to +150°C operating range, and RoHS-compliant matte tin-plated copper alloy leadframe optimized for automated reflow assembly.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal 27.7V typical zener voltage (midpoint of 26.99–28.39V range) and exhibits low dynamic impedance (≤80Ω at 1kHz), enabling precise regulation under varying load conditions. Its temperature coefficient is approximately +3.5mV/°C near 27V, per Figure 3 of DS31987 Rev. 23–2.
The device uses a planar epitaxial construction with cathode band marking, rated for 500mW dissipation on standard FR-4 PCBs with 10mm × 10mm copper pads. It meets J-STD-020 moisture sensitivity Level 1 and supports peak reflow profiles up to 260°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.99–28.39V at IZT = 5mA - defines stable reference point for feedback networks |
| Power Dissipation (PD) | 500mW on FR-4 - sets maximum continuous power handling without derating below 25°C |
| Zener Impedance (ZZT) | ≤80Ω at f = 1kHz - ensures minimal output voltage variation under dynamic load transients |
| Reverse Leakage (IR) | ≤0.07µA at VR = 25.6V - guarantees negligible error current in high-impedance reference paths |
| Thermal Resistance (RθJA) | 250°C/W - determines junction temperature rise above ambient under steady-state bias |
| Operating Temperature | -65°C to +150°C - supports deployment in automotive engine control units and industrial motor drives |
| Package | SOD323F - 2-pin surface-mount outline with 0.25–0.35mm lead width, optimized for 0402-class board space |
Pinout & Package
Package: SOD323F - ultra-compact plastic-molded case with cathode band marking, 0.004g mass, UL 94V-0 flammability rating, and matte tin annealed copper alloy terminals solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system GND or lower-potential rail in shunt regulator configuration |
| Cathode | Zener voltage output node | Provides stabilized voltage referenced to anode; marked by visible band on package body |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage regulation | ±3.5% VZ tolerance enables accurate feedback in 24V DC-DC converters without trimming |
| Automated assembly compatibility | SOD323F footprint and matte tin finish ensure reliable pick-and-place and reflow yield |
| Environmental compliance | Fully RoHS 3 compliant (≤1000ppm antimony, ≤900ppm Br/Cl), halogen-free "Green" compound |
| Thermal robustness | 150°C max junction temperature supports operation in sealed enclosures without forced cooling |
| Low leakage stability | 0.07µA max IR preserves accuracy in battery-powered sensor front-ends with µA-level bias currents |
Applications
| Industrial Power Supply Feedback | Automotive Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters for PLC I/O modules. IC Role / Device Role / Timing Role: Shunt voltage reference in optocoupler feedback path controlling primary-side PWM controller. Use Value: Tight 27.7V ±3.5% tolerance maintains ±1% output regulation across line/load/temperature variations. |
Use Scenario: Biasing and clamping analog outputs from pressure/temperature sensors in engine control units. IC Role / Device Role / Timing Role: Overvoltage protection and reference stabilization for 0–5V ratiometric sensor signals. Use Value: 0.07µA leakage prevents loading of high-impedance sensor outputs while clamping transients to 28.4V. |
| Medical Instrumentation Reference | Telecom Line Card Protection |
|
Use Scenario: Providing stable excitation voltage for precision bridge-based strain gauges in patient monitors. IC Role / Device Role / Timing Role: Low-drift voltage reference source in instrumentation amplifier gain-setting network. Use Value: 80Ω zener impedance minimizes noise coupling into µV-level differential measurements. |
Use Scenario: Protecting Ethernet PHY interface pins against ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-stage clamp limiting common-mode voltage to safe levels before TVS diodes. Use Value: 500mW power rating absorbs repetitive 100ns surge pulses without degradation in 48V PoE systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DDZ30BSF-7 | VZ = 27.70–29.13V (wider 5.2% tolerance vs. 5.2% for ASF grade) | Higher VZ spread reduces closed-loop accuracy in tight-regulation supplies | Select when cost priority outweighs ±0.5V reference precision |
| BZX84-C27LT1G | VZ = 25.7–28.3V (±5%), 350mW PD, SOT-23 package | Larger footprint and lower power rating limit use in high-current clamp designs | Choose for legacy SOT-23 board compatibility where SOD323F layout change is impractical |
Compared with DDZ30ASF-7, DDZ30BSF-7 trades tighter VZ control for broader tolerance, while BZX84-C27LT1G sacrifices 150mW dissipation headroom and requires larger PCB area-making DDZ30ASF-7 optimal for space-constrained, high-accuracy 27V reference designs.
Availability
DDZ30ASF-7 is available at Aetrix Electronics and suitable for industrial power supply feedback, automotive sensor signal conditioning, medical instrumentation reference, and telecom line card protection requiring stable component supply across extended temperature ranges and high-reliability manufacturing environments.
Supply support for DDZ30ASF-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-performance, high-reliability components for power management, signal integrity, and protection applications.
DDZ30ASF-7 belongs to the DDZxx(x)xSF precision Zener series designed specifically for stable voltage referencing and overvoltage clamping in compact, automated-assembly-ready surface-mount formats.
FAQ
What is the maximum continuous power dissipation for DDZ30ASF-7 on a standard FR-4 PCB?
The DDZ30ASF-7 is rated for 500mW maximum power dissipation when mounted on an FR-4 PCB with a 10mm × 10mm copper pad and board dimensions of 35mm × 25mm. Derating begins linearly above +25°C ambient, reaching zero dissipation at +150°C per the power derating curve in DS31987 Rev. 23–2 Figure 1.
Does DDZ30ASF-7 meet automotive qualification standards such as AEC-Q101?
DDZ30ASF-7 is not pre-qualified to AEC-Q101. Diodes Incorporated offers AEC-Q101-qualified variants (e.g., DDZ30ASF-Q) with PPAP capability and IATF 16949 manufacturing, but the standard DDZ30ASF-7 is intended for industrial and commercial applications unless explicitly specified otherwise in ordering documentation.
How is the cathode identified on the SOD323F package of DDZ30ASF-7?
The cathode terminal of DDZ30ASF-7 is marked by a visible dark band on the SOD323F package body, aligned with one end of the molded plastic case. This band corresponds to the cathode pin in the top-view mechanical drawing (DS31987 Rev. 23–2 page 5), and must be oriented toward the higher-potential node in shunt regulator configurations.
What is the typical temperature coefficient of DDZ30ASF-7 near its nominal zener voltage?
Per Figure 3 in DS31987 Rev. 23–2, the temperature coefficient of DDZ30ASF-7 is approximately +3.5mV/°C at its nominal 27.7V zener voltage. This positive TC means VZ increases by ~3.5mV per °C rise in junction temperature, a critical factor when designing temperature-stable references across -40°C to +125°C operating ranges.
DDZ30ASF-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):
- 27.69 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 70 nA @ 25.6 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
DDZ30ASF-7 FAQ
1.How can I place an order for DDZ30ASF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ30ASF-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 DDZ30ASF-7 reliable?
The price and inventory of DDZ30ASF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ30ASF-7 is usually 5 days.
3.What payment methods are accepted for DDZ30ASF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ30ASF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ30ASF-7?
DDZ30ASF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ30ASF-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 DDZ30ASF-7?
For technical support, including DDZ30ASF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ30ASF-7 requirements.
6.How does Aetrix verify that DDZ30ASF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ30ASF-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 DDZ30ASF-7 meets industry standards.
7.What is the process for return or replacement of DDZ30ASF-7?
All DDZ30ASF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ30ASF-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 DDZ30ASF-7 part is unused and in its original packaging.
Return procedure for DDZ30ASF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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