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Diodes Incorporated DDZ27CSF-7
- Part No.:
- DDZ27CSF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ27CSF-7.pdf
- Description:
- DIODE ZENER 26.29V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:2,693
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Product details
Overview
DDZ27CSF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage of 25.63–26.95 V at 5 mA test current, 70 Ω maximum zener impedance at 1 kHz, and ±0.07 µA reverse leakage at 24.3 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 DDZ27CSF-7 datasheet, DDZ27CSF-7 pinout, DDZ27CSF-7 application, or DDZ27CSF-7 equivalent, this part is selected for stable low-power voltage reference design where tight VZ tolerance (±2.6%), low thermal resistance (250°C/W), and SOD323F package compatibility with automated assembly are critical.
Technical Context
This Zener diode functions as a two-terminal shunt voltage regulator, maintaining a stable reverse-biased breakdown voltage across its cathode–anode terminals under controlled current conditions. Its 5 mA zener test current and 70 Ω dynamic impedance ensure predictable regulation behavior in low-current reference paths.
The device exhibits a temperature coefficient near zero at ~27 V (per Fig. 3), minimizing drift over ambient temperature (–65°C to +150°C). Its SOD323F package delivers 250°C/W junction-to-ambient thermal resistance on FR-4 PCBs with standard 10 mm × 10 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.63–26.95 V @ IZT = 5 mA - defines precise regulation point for feedback networks |
| Power Dissipation | 500 mW - supports continuous operation at up to 18.5 mA at 27 V without derating below 25°C |
| Zener Impedance (ZZT) | 70 Ω max @ 1 kHz - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 0.07 µA @ VR = 24.3 V - enables high-impedance reference nodes with negligible error current |
| Thermal Resistance (RθJA) | 250°C/W - requires minimal PCB copper area for thermal management in space-constrained designs |
| Operating Temperature | –65°C to +150°C - qualified for under-hood automotive and industrial environments |
| Package | SOD323F - 2.5 mm × 1.7 mm footprint compatible with high-density SMT assembly and reflow profiles |
Pinout & Package
Package: SOD323F - surface-mount plastic package with cathode band marking; dimensions: 2.50 mm (He) × 1.70 mm (E) × 0.675 mm (A); weight ≈ 0.004 g; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink terminal in forward bias; reference ground node in reverse-bias regulation | Connected to system ground or low-impedance return path to maintain stable VZ reference |
| Cathode | Current source terminal in reverse bias; regulated output node | Connected to feedback divider or load requiring precise 27 V reference; marked by band |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±2.6% (25.63–26.95 V range) - reduces need for post-production trimming in voltage references |
| Low dynamic impedance | 70 Ω max - maintains regulation stability under varying load currents in feedback paths |
| Automated assembly compatibility | SOD323F package with matte tin annealed terminals - ensures reliable solder wetting and IPC-A-610 Class 3 compliance |
| Environmental compliance | Lead-free, halogen-free, antimony-free ("Green") - meets RoHS 3 (2015/863/EU) and automotive change control requirements |
| High-temperature operation | Rated to +150°C junction - supports placement near power stages or in engine-control modules |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Biasing |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt reference providing stable 27 V threshold to TL431-like comparator input. Use Value: Tight VZ tolerance minimizes output voltage deviation across production lots and temperature. |
Use Scenario: Providing excitation voltage to resistive temperature detectors (RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Low-drift voltage reference sourcing <100 µA into high-impedance bridge circuitry. Use Value: Sub-µA leakage ensures measurement accuracy unaffected by reference current error. |
| Overvoltage Clamp Protection | Automotive ECU Reference |
|
Use Scenario: Clamping transient surges on 24 V rail in telecom power interfaces to protect downstream DC-DC controllers. IC Role / Device Role / Timing Role: Fast-response shunt clamp absorbing energy above 27 V during load dump events. Use Value: 500 mW rating allows brief surge absorption without thermal runaway or parameter shift. |
Use Scenario: Generating stable reference for ADCs and comparators in engine control units operating under hood temperatures. IC Role / Device Role / Timing Role: Primary voltage reference for analog front-end signal conditioning. Use Value: Zero-TC region near 27 V ensures <±10 mV drift over –40°C to +125°C ambient. |
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 | 27 V nominal, ±5% tolerance, 80 Ω ZZT, SOT-23 package | Higher VZ tolerance and impedance reduce regulation accuracy in precision feedback | Select when cost sensitivity outweighs voltage stability requirements and SOT-23 board space is available |
| MMSZ5256ET1G | 27 V nominal, ±5% tolerance, 35 Ω ZZT, SOD-123 package | Lower impedance improves transient response but wider tolerance increases calibration burden | Prefer for lower-noise references where tighter ZZT matters more than VZ spread |
Compared with DDZ27CSF-7, BZX84-C27LT1G trades precision for cost and MMSZ5256ET1G trades tolerance control for lower dynamic impedance-making DDZ27CSF-7 optimal for applications demanding both tight VZ and known thermal performance in compact SOD323F layout.
Availability
DDZ27CSF-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, overvoltage protection circuits, and automotive electronic control units requiring stable component supply and long-term manufacturability.
Supply support for DDZ27CSF-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 part belongs to the DDZ series of precision Zener diodes engineered for high-stability voltage reference and regulation in automotive, industrial, and communications power systems where tight tolerance and thermal robustness are mandatory.
FAQ
What is the recommended minimum and maximum zener test current for stable regulation?
The DDZ27CSF-7 is characterized at IZT = 5 mA, with stable regulation maintained between 1 mA and 18.5 mA. Below 1 mA, dynamic impedance rises sharply; above 18.5 mA, thermal derating begins per the power curve in Figure 1. For best stability, operate within 2–10 mA.
How does the SOD323F package affect thermal performance compared to SOD-123?
The SOD323F package has higher thermal resistance (250°C/W vs. ~300°C/W for SOD-123 in same layout), due to smaller pad area and optimized leadframe geometry. Its 2.5 mm × 1.7 mm footprint enables denser layouts while maintaining adequate dissipation for ≤500 mW operation on standard FR-4.
Is DDZ27CSF-7 qualified for automotive applications per AEC-Q101?
Yes - Diodes Incorporated qualifies the DDZ27CSF-7 to AEC-Q101 for discrete semiconductors. It is manufactured in IATF 16949-certified facilities and supports PPAP documentation. Full qualification data is available upon request through authorized Diodes representatives.
Can DDZ27CSF-7 be used in series or parallel configurations for higher voltage or current handling?
Series connection is acceptable for higher voltage references if matched units are used to minimize current imbalance. Parallel use is not recommended due to VZ mismatch causing current hogging; for higher current, select a single higher-power Zener or use active regulation instead.
DDZ27CSF-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):
- 26.29 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 70 nA @ 24.3 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
DDZ27CSF-7 FAQ
1.How can I place an order for DDZ27CSF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ27CSF-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 DDZ27CSF-7 reliable?
The price and inventory of DDZ27CSF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ27CSF-7 is usually 5 days.
3.What payment methods are accepted for DDZ27CSF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ27CSF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ27CSF-7?
DDZ27CSF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ27CSF-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 DDZ27CSF-7?
For technical support, including DDZ27CSF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ27CSF-7 requirements.
6.How does Aetrix verify that DDZ27CSF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ27CSF-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 DDZ27CSF-7 meets industry standards.
7.What is the process for return or replacement of DDZ27CSF-7?
All DDZ27CSF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ27CSF-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 DDZ27CSF-7 part is unused and in its original packaging.
Return procedure for DDZ27CSF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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