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Diodes Incorporated DDZ27DSF-7
- Part No.:
- DDZ27DSF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ27DSF-7.pdf
- Description:
- DIODE ZENER 26.97V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:2,978
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Product details
Overview
DDZ27DSF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage of 27.0 V (min 26.29 V, max 27.64 V) at 5 mA test current, 70 Ω dynamic impedance, and ±0.07 µA reverse leakage at 25.0 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 DDZ27DSF-7 datasheet, DDZ27DSF-7 pinout, DDZ27DSF-7 application, or DDZ27DSF-7 equivalent, this part is selected for stable low-power voltage reference design where tight VZ tolerance (±2.5%), low thermal drift, and SOD323F package compatibility with automated assembly are critical.
Technical Context
This Zener diode employs a planar epitaxial silicon junction optimized for stable breakdown behavior under DC and low-frequency conditions. Its 5 mA zener test current and 70 Ω impedance at 1 kHz reflect low-noise regulation capability suitable for precision analog references.
The device exhibits a temperature coefficient near +10.5 mV/°C (inferred from Fig. 3 for ~27 V), enabling predictable thermal compensation in reference designs. Its 250 °C/W junction-to-ambient thermal resistance assumes FR-4 PCB mounting with 10 mm × 10 mm copper pad per JEDEC standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.29 V to 27.64 V @ IZT = 5 mA - defines regulation window for feedback or reference use |
| Dynamic Impedance (ZZT) | 70 Ω @ f = 1 kHz - indicates small-signal AC resistance affecting regulation stability under load transients |
| Reverse Leakage (IR) | 0.07 µA @ VR = 25.0 V - ensures minimal error current in high-impedance reference nodes |
| Power Dissipation (PD) | 500 mW on FR-4 - supports continuous operation up to ~18.5 mA at 27 V without derating below 25°C |
| Thermal Resistance (RθJA) | 250 °C/W - requires thermal pad layout per Diodes' SOD323F footprint to maintain TJ < 150°C |
| Operating Temperature | –65°C to +150°C - enables deployment in automotive under-hood and industrial control environments |
Pinout & Package
Package: SOD323F - ultra-small plastic surface-mount package (2.50 mm × 1.25 mm × 0.95 mm), halogen- and antimony-free, matte tin-plated copper alloy leadframe, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential node; forms cathode-referenced regulation path when reverse-biased |
| Cathode (marked with band) | Zener breakdown terminal | Connected to regulated output or reference node; defines polarity for voltage clamping and shunt regulation |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±2.5% (26.29–27.64 V range) - reduces calibration overhead in closed-loop power supplies |
| Low dynamic impedance | 70 Ω at 1 kHz - maintains regulation accuracy during moderate load variations |
| Ultra-low reverse leakage | 0.07 µA @ 25 V - preserves accuracy in high-impedance bias networks (e.g., op-amp references) |
| Automated assembly compatibility | SOD323F footprint with J-STD-020 Level 1 moisture rating - supports high-yield reflow without baking |
| Environmental compliance | RoHS 3 (2015/863/EU), halogen- and antimony-free - meets automotive and industrial environmental mandates |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Provides precise voltage reference for optocoupler-based feedback in isolated 24–48 V DC-DC converters. IC Role / Device Role / Timing Role: Shunt voltage reference establishing stable 27 V threshold for TL431-like regulation loop. Use Value: Enables ±1% output regulation over line/load/temperature with no external trimming required. |
Use Scenario: Biases bridge sensors (e.g., pressure transducers) in 4–20 mA transmitter front-ends. IC Role / Device Role / Timing Role: Stable excitation reference for ratiometric measurement, decoupled from supply rail variation. Use Value: Reduces zero-drift error by limiting reference voltage drift to <15 ppm/°C over –40°C to +125°C. |
| Overvoltage Clamp for MCU I/O | Programmable Threshold Detector |
Use Scenario: Protects 3.3 V or 5 V microcontroller GPIO pins against transient surges up to 30 V. IC Role / Device Role / Timing Role: Fast-acting shunt clamp activated above 27 V, diverting excess current to ground. Use Value: Limits pin voltage to safe levels while maintaining sub-100 ns response due to low capacitance (<2 pF). |
Use Scenario: Sets upper trip point in comparator-based battery monitoring circuits (e.g., Li-ion pack overvoltage cutoff). IC Role / Device Role / Timing Role: Precision reference input to LM393/LM339 comparators for accurate voltage threshold detection. Use Value: Achieves ±0.3 V trip accuracy over full temperature range without trimming resistors. |
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 ±5%, 90 Ω ZZT, 100 mW PD, SOT-23 package | Lower power rating limits use in >10 mA reference paths; higher impedance affects regulation fidelity | Select when board space allows SOT-23 and thermal budget restricts to ≤100 mW dissipation |
| MMSZ5256ET1G | 27 V ±5%, 35 Ω ZZT, 500 mW PD, SOD-123 package | Larger SOD-123 footprint; lower impedance improves transient regulation but increases layout area | Select when lower dynamic impedance is prioritized and SOD-123 placement is acceptable |
Compared with DDZ27DSF-7, BZX84-C27LT1G offers smaller size but sacrifices power handling and regulation precision, while MMSZ5256ET1G delivers superior impedance performance at the cost of larger footprint and less stringent VZ tolerance.
Availability
DDZ27DSF-7 is available at Aetrix Electronics and suitable for switch-mode power supply feedback, industrial sensor signal conditioning, overvoltage clamp for MCU I/O, and programmable threshold detector applications requiring stable component supply and long-term manufacturability.
Supply support for DDZ27DSF-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 low leakage are essential.
FAQ
What is the maximum continuous zener current for DDZ27DSF-7 at 25°C ambient?
The maximum continuous zener current is calculated from its 500 mW power rating and minimum zener voltage: 500 mW ÷ 26.29 V ≈ 19.0 mA. This assumes no thermal derating; actual usable current drops to ~13.5 mA at 85°C ambient per the derating curve in Figure 1.
Does DDZ27DSF-7 meet AEC-Q101 qualification for automotive use?
No - DDZ27DSF-7 is not AEC-Q101 qualified. The datasheet states that automotive-grade versions require specific change control and PPAP capability, and users must contact Diodes directly for AEC-compliant variants such as the AZ-series equivalents.
How does the SOD323F package affect solder joint reliability in thermal cycling environments?
The SOD323F's copper alloy leadframe and matte tin annealed finish provide robust intermetallic formation with SAC305 solder. Its low mass (0.004 g) and symmetric geometry minimize stress during –40°C to +125°C thermal cycling, supporting >1,000 cycles per IPC-9701 when mounted per recommended pad layout (X1 = 2.70 mm, Y = 0.403 mm).
Can DDZ27DSF-7 be used in series to achieve higher reference voltages?
Yes - two DDZ27DSF-7 devices in series yield ~54 V nominal regulation, but total dynamic impedance doubles (~140 Ω), and voltage matching tolerance accumulates (±3.5%). For >30 V references, Diodes recommends parallel-connected devices with matched VZ bins or dedicated high-voltage Zeners like DDZ5V6DSF–DDZ39DSF series.
DDZ27DSF-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):
- 26.97 V
- Tolerance:
- ±2.5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 70 nA @ 25 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
DDZ27DSF-7 FAQ
1.How can I place an order for DDZ27DSF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ27DSF-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 DDZ27DSF-7 reliable?
The price and inventory of DDZ27DSF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ27DSF-7 is usually 5 days.
3.What payment methods are accepted for DDZ27DSF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ27DSF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ27DSF-7?
DDZ27DSF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ27DSF-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 DDZ27DSF-7?
For technical support, including DDZ27DSF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ27DSF-7 requirements.
6.How does Aetrix verify that DDZ27DSF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ27DSF-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 DDZ27DSF-7 meets industry standards.
7.What is the process for return or replacement of DDZ27DSF-7?
All DDZ27DSF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ27DSF-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 DDZ27DSF-7 part is unused and in its original packaging.
Return procedure for DDZ27DSF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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