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Diodes Incorporated DDZ27DQ-7
- Part No.:
- DDZ27DQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ27DQ-7.pdf
- Description:
- DIODE ZENER 26.97V 470MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,703
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Product details
Overview
DDZ27DQ-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 27.0 V (min 26.29 V, max 27.64 V), 5 mA test current, 45 Ω zener impedance at 5 mA, and 21.0 V maximum reverse voltage rating. It operates within -65°C to +150°C, features tight ±2.5% VZ tolerance, and is used for voltage regulation and reference in power supply feedback loops and analog sensing circuits.
For engineers reviewing the DDZ27DQ-7 datasheet, DDZ27DQ-7 pinout, DDZ27DQ-7 application, or DDZ27DQ-7 equivalent, this part serves as a stable, low-capacitance (≈1.8 pF) automotive-grade voltage reference requiring minimal board space in SOD123 package with cathode band polarity marking.
Technical Context
This Zener diode employs silicon planar epitaxial construction optimized for stable breakdown characteristics under low-current conditions (IZT = 5 mA). Its temperature coefficient is +0.075%/°C (typical), enabling predictable drift compensation in mid-voltage reference designs.
The device is rated for 294 mW power dissipation on minimal pad layout (Note 8) and 470 mW on 1-in² copper area (Note 7), with thermal resistance of 425°C/W and 266°C/W respectively - confirming its suitability for thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.29–27.64 V @ IZT = 5 mA - defines precise regulation window for 27 V rail stabilization |
| Zener Impedance (ZZT) | 45 Ω @ 5 mA - ensures low dynamic resistance for stable reference under load transients |
| Maximum Reverse Voltage (VR) | 21.0 V - sets safe non-conduction threshold below zener knee for input protection |
| Power Dissipation (PD) | 294 mW (minimal pad) - limits thermal rise in compact layouts without heatsinking |
| Operating Temperature | -65°C to +150°C - supports under-hood and industrial ambient operation |
| Capacitance (CT) | ≈1.8 pF @ VR = 1 V - enables high-frequency noise filtering without signal loading |
| Reverse Current (IR) | 0.05 µA @ VR = 21.0 V - guarantees ultra-low leakage in battery-backed reference nodes |
Pinout & Package
Package: SOD123 - surface-mount plastic case (1.55 mm × 2.65 mm × 1.05 mm), cathode marked by band, matte tin-plated Alloy 42 leadframe, RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during forward bias; grounded node in shunt regulator configuration | Connected to system ground or low-impedance return path to maintain stable reference potential |
| Cathode | Output node in shunt regulation; voltage-sensing point | Connected to regulated rail or error amplifier input - carries full zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 qualified, PPAP capable, manufactured in IATF16949-certified facilities - meets Tier-1 automotive reliability requirements |
| Tight VZ tolerance | ±2.5% (26.29–27.64 V range) - reduces calibration overhead in precision feedback networks |
| Low zener impedance | 45 Ω @ 5 mA - minimizes output voltage variation across load current changes |
| Ultra-low leakage | 0.05 µA @ 21 V - preserves battery life in always-on monitoring circuits |
| Thermal robustness | 150°C max junction temperature - supports operation near power converters and motor drivers |
Applications
| Industrial Power Supply Feedback | Automotive Battery Monitoring |
|---|---|
|
Use Scenario: Regulating 27 V auxiliary rail in programmable logic controller (PLC) power module. IC Role / Device Role / Timing Role: Shunt voltage reference for TL431-based feedback loop controlling primary-side PWM duty cycle. Use Value: Tight 2.5% VZ tolerance eliminates need for post-production trimming; 45 Ω ZZT maintains <±15 mV output deviation under 10–100 mA load steps. |
Use Scenario: Reference node for 12/24/27 V battery state-of-charge (SoC) measurement in vehicle telematics unit. IC Role / Device Role / Timing Role: Stable voltage reference for ADC input scaling in microcontroller-based analog front-end. Use Value: 0.05 µA reverse leakage prevents measurable voltage drop across 1 MΩ divider network; -65°C to +150°C rating covers engine bay deployment. |
| Medical Sensor Biasing | Test Equipment Calibration |
|
Use Scenario: Providing excitation voltage for strain gauge bridge in portable diagnostic device. IC Role / Device Role / Timing Role: Low-noise, low-drift DC reference source for Wheatstone bridge excitation. Use Value: 1.8 pF capacitance avoids high-frequency coupling into sensitive analog paths; +0.075%/°C TC enables predictable offset correction in firmware. |
Use Scenario: On-board reference in handheld multimeter for auto-ranging DC voltage measurement up to 30 V. IC Role / Device Role / Timing Role: Primary voltage standard against which DMM ADC gain and offset are calibrated. Use Value: AEC-Q101 qualification ensures long-term stability over 10,000+ measurement cycles; SOD123 footprint allows traceable replacement during recalibration. |
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 (25.65–28.35 V), 80 Ω ZZT, SOT-23 package | Higher VZ spread and impedance reduce accuracy in closed-loop regulation | Select when cost sensitivity outweighs precision; requires larger layout area and lacks AEC-Q101 certification |
| MMSZ5258ET1G | 27 V nominal, ±5% tolerance, 35 Ω ZZT, SOD-123 package, commercial grade only | No automotive qualification; 0.1 µA IR at 21 V - 2× higher leakage than DDZ27DQ-7 | Acceptable for non-automotive industrial use where leakage <0.1 µA is acceptable and PPAP not required |
Compared with BZX84-C27LT1G and MMSZ5258ET1G, DDZ27DQ-7 delivers tighter tolerance, lower leakage, and automotive qualification - making it the sole choice for safety-critical or production automotive voltage references where long-term stability and traceability are mandatory.
Availability
DDZ27DQ-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery monitors, medical sensor modules, and portable test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for DDZ27DQ-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.
The DDZ series targets precision voltage reference applications in automotive, industrial, and medical systems - engineered for tight tolerance, low leakage, and AEC-Q101 compliance in compact SOD123 packaging.
FAQ
What is the maximum continuous power dissipation for DDZ27DQ-7 on a standard FR-4 PCB?
DDZ27DQ-7 dissipates up to 294 mW when mounted on an FR-4 board with minimum recommended pad layout (per Note 8), and 470 mW with 1-in² copper area (per Note 7). Derating begins above +25°C ambient per Figure 1 - at +75°C, maximum power drops to 500 mW only if lead temperature (TL) is controlled to that level via thermal vias or heatsinking.
Is DDZ27DQ-7 compatible with lead-free reflow soldering processes?
Yes - DDZ27DQ-7 uses matte tin annealed terminals over Alloy 42 leadframe and is fully RoHS 3 compliant (≤1000 ppm antimony, ≤900 ppm Br/Cl). It withstands JEDEC J-STD-020 moisture sensitivity Level 1 and supports peak reflow temperatures up to 260°C for 10 seconds, matching standard lead-free SAC305 profiles.
How does the temperature coefficient affect regulation accuracy over -40°C to +125°C?
DDZ27DQ-7 exhibits +0.075%/°C typical TC (Figure 18), resulting in ≈±1.25% VZ shift across -40°C to +125°C. At 27 V nominal, this equals ±338 mV total drift - acceptable for non-critical references but requires firmware compensation in high-accuracy ADC applications.
Can DDZ27DQ-7 replace DDZ27D-7 in existing designs?
Yes - DDZ27DQ-7 is the automotive-qualified variant of DDZ27D-7, sharing identical electrical specs, SOD123 package, and marking code "2M". The "Q" suffix denotes AEC-Q101 qualification, PPAP capability, and IATF16949 manufacturing - no layout or schematic changes are needed for drop-in replacement in automotive designs.
DDZ27DQ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 26.97 V
- Tolerance:
- ±3%
- Power - Max:
- 470 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
DDZ27DQ-7 FAQ
1.How can I place an order for DDZ27DQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ27DQ-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 DDZ27DQ-7 reliable?
The price and inventory of DDZ27DQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ27DQ-7 is usually 5 days.
3.What payment methods are accepted for DDZ27DQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ27DQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ27DQ-7?
DDZ27DQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ27DQ-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 DDZ27DQ-7?
For technical support, including DDZ27DQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ27DQ-7 requirements.
6.How does Aetrix verify that DDZ27DQ-7 is sourced from the original manufacturer or authorized distributors?
All DDZ27DQ-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 DDZ27DQ-7 meets industry standards.
7.What is the process for return or replacement of DDZ27DQ-7?
All DDZ27DQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ27DQ-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 DDZ27DQ-7 part is unused and in its original packaging.
Return procedure for DDZ27DQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZ27DQ-7 Tags
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