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Diodes Incorporated DDZ27DS-7
- Part No.:
- DDZ27DS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
DDZ27DS-7.pdf
- Description:
- DIODE ZENER 27V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
DDZ27DS-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 26.29–27.64 V, 5 mA test current, 45 Ω dynamic impedance at 5 mA, 0.05 µA reverse leakage at 21 V, and 200 mW power dissipation in SOD323 package - used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the DDZ27DS-7 datasheet, DDZ27DS-7 pinout, DDZ27DS-7 application, or DDZ27DS-7 equivalent, this page delivers verified electrical specs, thermal derating behavior, temperature coefficient data, SOD323 mechanical dimensions, and real-world design context for stable voltage reference implementation.
Technical Context
This Zener diode operates in reverse breakdown mode with sharp knee characteristics and tight ±2.5% VZ tolerance (26.29–27.64 V at IZT = 5 mA). Its 45 Ω zener impedance at 5 mA ensures minimal output voltage variation under load changes.
It exhibits a positive temperature coefficient of ~0.08 %/°C near 27 V, enabling predictable drift compensation in reference designs. Rated for –65 °C to +150 °C operation and 200 mW dissipation on FR-4 board, it supports high-reliability industrial sensing and power-supply feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.29–27.64 V at IZT = 5 mA - defines stable regulation point for mid-range voltage references |
| Zener Impedance (ZZT) | 45 Ω at IZT = 5 mA - limits output voltage shift under 1 mA load change to <45 mV |
| Reverse Leakage (IR) | 0.05 µA at VR = 21 V - ensures negligible error current in high-impedance bias networks |
| Power Dissipation (PD) | 200 mW at TA = 25 °C - supports continuous operation up to ~8 mA average current with derating |
| Thermal Resistance (RθJA) | 625 °C/W - requires careful PCB copper area management above 50 mW ambient dissipation |
| Operating Temperature | –65 °C to +150 °C - qualified for extended industrial and automotive under-hood environments |
| Package | SOD323 - 1.3 mm × 1.7 mm footprint compatible with fine-pitch automated placement and reflow |
Pinout & Package
SOD323 package: 2-terminal surface-mount device with cathode band marking; molded plastic case (UL 94V-0), matte tin-plated alloy 42 leadframe, polarity indicated by visible cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; forms return path for zener current during regulation |
| Cathode | Regulated output node | Provides stable voltage referenced to anode; must be decoupled locally for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp breakdown knee | Enables precise threshold detection without soft turn-on ambiguity in comparator reference circuits |
| Tight VZ tolerance (±2.5%) | Reduces calibration overhead in factory-trimmed analog front-ends and sensor signal chains |
| Low leakage (0.05 µA @ 21 V) | Preserves accuracy in high-impedance divider networks and battery-powered standby circuits |
| Lead-free & halogen-free | Meets IPC-J-STD-020 Level 1 moisture sensitivity and RoHS 2 / REACH compliance for global production |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Voltage Reference |
|---|---|
Use Scenario: Precision analog front-end for RTD or strain gauge measurement where excitation voltage stability directly impacts measurement resolution. IC Role / Device Role / Timing Role: Zener diode provides stable 27 V reference for op-amp gain-setting resistors and ADC reference buffer. Use Value: 45 Ω impedance and ±2.5% VZ tolerance limit reference drift to <0.1% over temperature and supply variation. |
Use Scenario: Standby-mode voltage reference for ultra-low-power MCU wake-up comparators in battery-operated IoT nodes. IC Role / Device Role / Timing Role: Supplies regulated bias to comparator input while drawing only 0.05 µA leakage in sleep state. Use Value: Sub-microamp reverse current extends shelf life and enables >10-year battery operation without recalibration. |
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
Use Scenario: Secondary-side feedback network in isolated flyback converters requiring accurate output voltage regulation. IC Role / Device Role / Timing Role: Sets error amplifier reference point for TL431-like control loop; replaces discrete resistor divider. Use Value: Tight VZ tolerance eliminates need for post-production trimming, reducing BOM count and test time. |
Use Scenario: Input-stage clamp protecting downstream LDOs or USB interface ICs from transient surges in 24 V industrial buses. IC Role / Device Role / Timing Role: Shunts excess energy above 27 V to ground before damage threshold of protected IC is exceeded. Use Value: Sharp breakdown onset ensures clamping begins within 100 ns of overvoltage event, limiting peak stress to <30 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | 27 V nominal, ±5% tolerance, 80 Ω ZZT at 5 mA, SOT-23 package | Higher impedance and looser tolerance reduce regulation accuracy in precision references | Select when cost sensitivity outweighs voltage stability requirements and SOT-23 board space is available |
| MMSZ5256ET1G | 27 V nominal, ±5% tolerance, 35 Ω ZZT at 20 mA, SOD-123 package | Requires higher test current (20 mA) for spec compliance; less suitable for micro-power designs | Prefer for higher-current shunt regulators where 200 mW dissipation margin is sufficient and SOD-123 layout fits |
Compared with BZX84-C27LT1G and MMSZ5256ET1G, DDZ27DS-7 offers tighter tolerance and lower impedance at lower test current - making it optimal for precision, low-quiescent-current reference designs where SOD323 footprint is acceptable.
Availability
DDZ27DS-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, low-power microcontroller reference, switching power supply feedback, and overvoltage protection requiring stable component supply across long-lifecycle embedded programs.
Supply support for DDZ27DS-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, industry-qualified components for automotive, industrial, and computing markets.
DDZ27DS-7 belongs to the DDZxxS series of precision Zener diodes engineered for stable voltage reference and regulation in space-constrained, thermally demanding applications - emphasizing low leakage, sharp breakdown, and tight parametric control.
FAQ
What is the maximum continuous zener current for DDZ27DS-7 at 70°C ambient?
At 70°C ambient, the power derating curve (Fig. 1) reduces allowable dissipation to ~150 mW. With VZ ≈ 27 V, maximum continuous current is ~5.6 mA - calculated as PD/VZ. Exceeding this risks thermal runaway due to positive TC and insufficient heat sinking.
Does DDZ27DS-7 require external series resistance in typical regulator configurations?
Yes - a series current-limiting resistor is mandatory to set IZ within 5 mA ±10% for specified VZ and ZZT. For a 30 V supply, a 560 Ω resistor delivers ~5.4 mA, keeping dissipation below 200 mW while maintaining regulation accuracy per datasheet conditions.
How does the temperature coefficient affect long-term reference stability?
DDZ27DS-7 has a measured TC of ~+0.08 %/°C near 27 V (Fig. 14). Over a 100°C range (–25°C to +75°C), this produces ~8 mV/°C × 100°C = ±0.8 V drift - requiring compensation in metrology-grade designs but acceptable for general-purpose regulation.
Can DDZ27DS-7 be used in parallel for higher power handling?
No - Zener diodes exhibit negative resistance slope above knee voltage; paralleling causes current hogging and thermal instability. For higher power, use a single higher-rated Zener or active shunt regulator topology with external transistor and feedback.
DDZ27DS-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±2.5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 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-323
DDZ27DS-7 FAQ
1.How can I place an order for DDZ27DS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ27DS-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 DDZ27DS-7 reliable?
The price and inventory of DDZ27DS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ27DS-7 is usually 5 days.
3.What payment methods are accepted for DDZ27DS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ27DS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ27DS-7?
DDZ27DS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ27DS-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 DDZ27DS-7?
For technical support, including DDZ27DS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ27DS-7 requirements.
6.How does Aetrix verify that DDZ27DS-7 is sourced from the original manufacturer or authorized distributors?
All DDZ27DS-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 DDZ27DS-7 meets industry standards.
7.What is the process for return or replacement of DDZ27DS-7?
All DDZ27DS-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ27DS-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 DDZ27DS-7 part is unused and in its original packaging.
Return procedure for DDZ27DS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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