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Diodes Incorporated DDZ20CQ-7
- Part No.:
- DDZ20CQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ20CQ-7.pdf
- Description:
- DIODE ZENER 19.73V 470MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,855
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Product details
Overview
DDZ20CQ-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 20 V (19.23–20.22 V), 10 mA test current, 28 Ω dynamic impedance at 1 kHz, and ±0.05 µA reverse leakage at 15 V. It operates in SOD123 package and serves as a stable voltage reference or overvoltage clamp in power supply feedback loops and analog sensor conditioning circuits.
For engineers reviewing the DDZ20CQ-7 datasheet, DDZ20CQ-7 pinout, DDZ20CQ-7 application, or DDZ20CQ-7 equivalent, key selection criteria include zener voltage tolerance, temperature coefficient (±0.04 %/°C typical), thermal resistance (425 °C/W on minimal pad), automotive qualification (AEC-Q101), and RoHS-compliant green molding compound.
Technical Context
This device functions as a two-terminal voltage reference operating in reverse breakdown mode. Its zener voltage is stabilized by controlled avalanche mechanism above ~6.8 V, with low dynamic impedance (28 Ω) ensuring minimal output variation under load transients.
Designed for automotive-grade reliability, it features AEC-Q101 qualification, IATF16949 manufacturing, and halogen/antimony-free "Green" packaging. Thermal performance is defined for two mounting conditions: 425 °C/W on minimal SOD123 pad layout and 266 °C/W on 1-in² copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.23–20.22 V at IZT = 10 mA - defines stable regulation point for feedback or clamping |
| Zener Impedance (ZZT) | 28 Ω at f = 1 kHz - ensures <1% output deviation for ±0.3 mA load change |
| Reverse Leakage (IR) | 0.05 µA at VR = 15 V - enables low-power bias networks without significant error |
| Power Dissipation (PD) | 294 mW at TA = +25°C on minimal pad - sets max continuous current to ~14.7 mA |
| Temp. Coefficient (TCVZ) | ±0.04 %/°C typical - contributes ≤±0.8 mV/°C drift in 20 V reference |
| Package | SOD123 - 2.65 mm × 1.55 mm footprint compatible with high-density PCB layouts |
| Qualification | AEC-Q101 qualified - validated for automotive underhood environments (-40 to +125°C ambient) |
Pinout & Package
Two-terminal device in SOD123 package: cathode marked by band; anode unmarked. Terminals are matte tin-annealed alloy 42 leads, solderable per MIL-STD-202 Method 208. Moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reference node / regulated output | Connected to circuit node requiring stable voltage; reverse-biased during operation |
| Anode (unmarked end) | Ground or return path | Typically tied to system ground or lower-potential rail; completes reverse-bias current path |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage regulation | ±2.5% VZ tolerance (19.23–20.22 V) enables accurate 20 V references without trimming |
| Automotive-grade reliability | AEC-Q101 qualified, PPAP-capable, manufactured in IATF16949 facilities for mission-critical systems |
| Low thermal resistance variant | 266 °C/W on 1-in² copper pad supports higher power derating in thermally constrained designs |
| Environmentally compliant packaging | Halogen- and antimony-free "Green" compound (<900 ppm Br/Cl, <1000 ppm Sb) meets global environmental mandates |
| High-reliability termination | Matte tin-annealed alloy 42 leads ensure robust solder joint integrity across thermal cycling |
Applications
| Automotive Cabin Control Module | Industrial PLC Analog Input Stage |
|---|---|
|
Use Scenario: Regulating reference voltage for 12-bit ADC measuring HVAC actuator position. IC Role / Device Role / Timing Role: Precision 20 V reference for ADC internal VREF buffer and external op-amp gain setting. Use Value: Tight VZ tolerance and low TCVZ reduce measurement error to <±0.5 LSB over -40°C to +85°C. |
Use Scenario: Clamping transient spikes on 24 V fieldbus lines connected to analog input protection circuitry. IC Role / Device Role / Timing Role: Overvoltage protector limiting line voltage to 20.22 V during ESD or inductive kick events. Use Value: 28 Ω ZZT ensures clamping voltage stays within ±0.3 V of rated VZ under 100 mA surge pulses. |
| Medical Infusion Pump Power Supply | Test Equipment Voltage Calibration Source |
|
Use Scenario: Providing stable bias for isolated DC-DC converter feedback optocoupler in Class II medical power supply. IC Role / Device Role / Timing Role: Primary-side zener reference establishing precise 20 V regulation before isolation barrier. Use Value: AEC-Q101 qualification and 150°C max junction temperature support long-term reliability in sealed enclosures. |
Use Scenario: Serving as traceable 20 V calibration node in benchtop multimeter front-end reference chain. IC Role / Device Role / Timing Role: Low-drift voltage standard referenced against metrology-grade sources during factory calibration. Use Value: 0.05 µA IR at 15 V minimizes loading error on high-impedance calibration dividers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20LT1G | Same SOD-123 package, but wider VZ tolerance (19–21.2 V), higher ZZT (50 Ω), no AEC-Q101 rating | Not suitable for automotive or high-precision industrial use; acceptable for cost-sensitive consumer power rails | Select when AEC-Q101 and tight regulation are not required; verify thermal margin with 425 °C/W RθJA |
| MMSZ5249B-TP | SOD-123, VZ = 20 V (19–21 V), ZZT = 25 Ω, AEC-Q101 qualified, but only 200 mW PD on minimal pad | Limited power handling restricts use in >10 mA reference sinks; requires larger copper area for same dissipation | Prefer where lower ZZT is critical but automotive compliance is mandatory; confirm board layout supports 200 mW derating |
Compared with BZX84-C20LT1G and MMSZ5249B-TP, DDZ20CQ-7 uniquely balances AEC-Q101 qualification, 294 mW dissipation on minimal pad, and 28 Ω impedance-making it optimal for space-constrained automotive and industrial voltage references demanding both reliability and regulation accuracy.
Availability
DDZ20CQ-7 is available at Aetrix Electronics and suitable for automotive cabin control modules, industrial PLC analog inputs, medical infusion pump power supplies, and test equipment calibration sources requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for DDZ20CQ-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 and overvoltage protection in automotive, industrial, and medical systems-emphasizing tight VZ tolerance, low temperature coefficient, and AEC-Q101 compliance for harsh-environment reliability.
FAQ
What is the maximum continuous reverse current DDZ20CQ-7 can handle at +85°C ambient?
At +85°C ambient on a minimal SOD123 pad layout (RθJA = 425 °C/W), the derated power dissipation is 176 mW. With VZ ≈ 20 V, this supports up to 8.8 mA continuous reverse current without exceeding TJ = +150°C. Exceeding this requires thermal relief or forced airflow.
Does DDZ20CQ-7 require external series resistance in typical voltage reference applications?
Yes-DDZ20CQ-7 must be biased with a current-limiting resistor to maintain IZ between 1 mA and 10 mA. For a 24 V supply regulating to 20 V, a 390 Ω resistor delivers ~10.3 mA, staying within PD limits while ensuring stable regulation and low ZZT.
How does the SOD123 package affect PCB layout for thermal performance?
The SOD123's small pad area (0.95 mm × 0.9 mm) limits heat spreading. To achieve the 266 °C/W RθJA, the anode and cathode pads must connect to ≥1 in² of 2 oz copper via multiple thermal vias. Without this, thermal resistance rises to 425 °C/W, reducing safe operating current by 40%.
Is DDZ20CQ-7 suitable for bidirectional ESD protection?
No-DDZ20CQ-7 is a unidirectional Zener diode optimized for reverse-bias regulation. It lacks symmetric clamping characteristics and has no specified forward surge rating. For bidirectional ESD protection, use purpose-built TVS arrays like D24Z20LPQ-7 or SMAJ20A.
DDZ20CQ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 19.73 V
- Tolerance:
- ±3%
- Power - Max:
- 470 mW
- Impedance (Max) (Zzt):
- 28 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 15 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
DDZ20CQ-7 FAQ
1.How can I place an order for DDZ20CQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ20CQ-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 DDZ20CQ-7 reliable?
The price and inventory of DDZ20CQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ20CQ-7 is usually 5 days.
3.What payment methods are accepted for DDZ20CQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ20CQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ20CQ-7?
DDZ20CQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ20CQ-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 DDZ20CQ-7?
For technical support, including DDZ20CQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ20CQ-7 requirements.
6.How does Aetrix verify that DDZ20CQ-7 is sourced from the original manufacturer or authorized distributors?
All DDZ20CQ-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 DDZ20CQ-7 meets industry standards.
7.What is the process for return or replacement of DDZ20CQ-7?
All DDZ20CQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ20CQ-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 DDZ20CQ-7 part is unused and in its original packaging.
Return procedure for DDZ20CQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZ20CQ-7 Tags
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