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Diodes Incorporated DDZ27BSF-7
- Part No.:
- DDZ27BSF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ27BSF-7.pdf
- Description:
- DIODE ZENER 25.62V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:2,654
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Product details
Overview
DDZ27BSF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage of 25.6 V (min 24.97 V, max 26.26 V) at 5 mA test current, 70 Ω maximum zener impedance, and ±5% tolerance - designed for voltage regulation and reference in low-power analog circuits, power supply feedback loops, and overvoltage protection on FR-4 PCBs.
For engineers reviewing the DDZ27BSF-7 datasheet, DDZ27BSF-7 pinout, DDZ27BSF-7 application, or DDZ27BSF-7 equivalent, key selection criteria include its SOD323F package footprint, tight VZ tolerance, low temperature coefficient (~+5.5 mV/°C), and suitability for automotive-grade designs when qualified per AEC-Q101.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified test current of 5 mA, delivering stable reference voltage under controlled thermal conditions (RθJA = 250 °C/W on standard FR-4). Its low leakage (<0.07 µA at 23.7 V) and predictable temperature coefficient enable accurate voltage referencing across -65°C to +150°C ambient range.
The device uses a planar epitaxial construction with matte tin–annealed copper alloy leadframe, optimized for reflow soldering and automated assembly. Cathode identification is marked by a band on the SOD323F body, and moisture sensitivity is rated at Level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24.97–26.26 V at IZT = 5 mA - defines precise regulation window for feedback or clamping |
| Power Dissipation (PD) | 500 mW on FR-4 (10 mm × 10 mm pad) - sets maximum continuous power handling in typical layout |
| Zener Impedance (ZZT) | ≤70 Ω at f = 1 kHz - ensures minimal output voltage variation under dynamic load changes |
| Reverse Leakage (IR) | ≤0.07 µA at VR = 23.7 V - guarantees low quiescent current in high-impedance reference nodes |
| Thermal Resistance (RθJA) | 250 °C/W - determines junction temperature rise above ambient under steady-state power |
| Operating Temperature | -65°C to +150°C - supports industrial and automotive under-hood applications |
| Package | SOD323F - 2-pin surface-mount outline with 1.25 mm × 1.70 mm footprint and 0.40 mm pitch |
Pinout & Package
Package: SOD323F - ultra-small plastic molded case (UL 94V-0), 0.004 g weight, cathode identified by band marking. Compatible with standard reflow profiles and automated pick-and-place.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in shunt regulation configuration |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input voltage source; maintains stable VZ across load when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage regulation | ±5% VZ tolerance at 5 mA enables accurate feedback in switching regulators |
| Low thermal resistance packaging | SOD323F with RθJA = 250 °C/W allows reliable 500 mW operation without heatsinking |
| Automated assembly compatibility | Lead-free, halogen-free, and J-STD-020 Level 1 moisture rating support high-yield SMT lines |
| Stable high-temperature operation | Guaranteed performance from -65°C to +150°C meets extended industrial and automotive requirements |
| Low leakage current | ≤0.07 µA at 23.7 V minimizes error in high-impedance voltage divider or reference circuits |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Shunt reference providing precise VZ to drive optocoupler LED current proportional to output deviation. Use Value: Tight 5% VZ tolerance and low ZZT ensure <±1.5% output regulation accuracy across line/load/temperature. |
Use Scenario: Placed across sensitive IC inputs to clamp transient overvoltages exceeding absolute maximum ratings. IC Role / Device Role / Timing Role: Fast-acting voltage limiter that conducts only when input exceeds 26.26 V, diverting surge current to ground. Use Value: Low leakage (<0.07 µA) avoids signal loading; 70 Ω ZZT ensures clamping voltage stays within safe margin during ESD events. |
| Temperature-Stable Reference Source | Automotive Body Control Module (BCM) |
|
Use Scenario: Biasing precision op-amp circuits requiring stable reference voltage in sensor signal conditioning stages. IC Role / Device Role / Timing Role: Provides low-drift DC reference point; paired with low-TC resistors for compensated design. Use Value: Predictable +5.5 mV/°C TC and minimal hysteresis allow compensation algorithms to maintain <10 ppm/°C effective drift. |
Use Scenario: Regulating auxiliary 5 V rail for microcontroller peripherals in BCM modules operating under wide ambient swings. IC Role / Device Role / Timing Role: Secondary shunt regulator stabilizing local supply when main LDO output exhibits ripple or dropout. Use Value: AEC-Q101 qualification path available and -65°C to +150°C rating support under-hood deployment without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | VZ = 25.6–28.0 V (±5%), PD = 300 mW, SOT-23 package, RθJA ≈ 300 °C/W | Lower power rating and higher thermal resistance limit continuous use in 500 mW designs | Select when board space permits SOT-23 and thermal budget allows ≤300 mW dissipation |
| MMSZ5256B-TP | VZ = 25.1–26.9 V (±5%), PD = 500 mW, SOD-123 package, RθJA = 290 °C/W | Larger SOD-123 footprint (2.7 × 1.4 mm vs. 1.7 × 1.25 mm) and 40 °C/W higher RθJA | Choose if existing layout uses SOD-123 or requires higher surge robustness (higher IFSM) |
Compared with BZX84-C27LT1G and MMSZ5256B-TP, DDZ27BSF-7 offers superior thermal efficiency in ultra-compact layouts and tighter process control for production-critical voltage references - making it optimal where board area, power density, and regulation stability are jointly constrained.
Availability
DDZ27BSF-7 is available at Aetrix Electronics and suitable for switching power supplies, overvoltage protection circuits, precision reference sources, and automotive body control modules requiring stable component supply and long-term manufacturability.
Supply support for DDZ27BSF-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.
The DDZ series targets precision voltage reference and regulation in space-constrained, thermally demanding applications - engineered for consistency in automated SMT assembly and extended temperature operation.
FAQ
What is the maximum continuous power dissipation for DDZ27BSF-7 on a standard PCB?
DDZ27BSF-7 is rated for 500 mW continuous power dissipation when mounted on an FR-4 PCB with a 10 mm × 10 mm copper pad and board dimensions of 35 mm × 25 mm. Derating is required above +25°C ambient per the published power derating curve (0.6 W at 25°C, linearly decreasing to zero at 150°C).
Does DDZ27BSF-7 meet automotive qualification standards?
DDZ27BSF-7 is manufactured in IATF 16949 certified facilities and supports PPAP documentation. While the base part is not pre-qualified to AEC-Q101, Diodes Incorporated offers AEC-Q101 qualified versions (e.g., DDZ27BSFQ-7) upon request - confirmed via official Diodes product definitions page and automotive change control process.
How is cathode polarity identified on the SOD323F package?
The cathode is marked by a visible band on the body of the SOD323F package. In top view, the band aligns with one end of the rectangular outline; the opposite end is the anode. This matches standard SOD323F mechanical drawings and Diodes' marking convention shown in DS31987 Rev. 23-2, page 5.
What is the typical temperature coefficient for DDZ27BSF-7?
Based on Figure 3 in DS31987 Rev. 23-2, the temperature coefficient for a 27 V-class Zener (e.g., DDZ27xSF variants) is approximately +5.5 mV/°C. This positive TC indicates VZ increases linearly with junction temperature - critical for compensating drift in precision reference designs.
DDZ27BSF-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):
- 25.62 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 70 nA @ 23.7 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
DDZ27BSF-7 FAQ
1.How can I place an order for DDZ27BSF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ27BSF-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 DDZ27BSF-7 reliable?
The price and inventory of DDZ27BSF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ27BSF-7 is usually 5 days.
3.What payment methods are accepted for DDZ27BSF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ27BSF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ27BSF-7?
DDZ27BSF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ27BSF-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 DDZ27BSF-7?
For technical support, including DDZ27BSF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ27BSF-7 requirements.
6.How does Aetrix verify that DDZ27BSF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ27BSF-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 DDZ27BSF-7 meets industry standards.
7.What is the process for return or replacement of DDZ27BSF-7?
All DDZ27BSF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ27BSF-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 DDZ27BSF-7 part is unused and in its original packaging.
Return procedure for DDZ27BSF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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