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Diodes Incorporated DDZ20C-7
- Part No.:
- DDZ20C-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ20C-7.pdf
- Description:
- DIODE ZENER 20V 470MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:13,882
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Product details
Overview
DDZ20C-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 19.23–20.22 V at 10 mA test current, 28 Ω maximum zener impedance at 1 kHz, and ±0.05 µA maximum reverse leakage at 15.0 V. It operates across –65 °C to +150 °C and delivers stable voltage reference in low-power analog monitoring circuits.
For engineers reviewing the DDZ20C-7 datasheet, DDZ20C-7 pinout, DDZ20C-7 application, or DDZ20C-7 equivalent, this device serves as a tight-tolerance, low-noise voltage reference for power supply feedback, sensor biasing, and overvoltage protection where thermal stability and SOD123 footprint compatibility are critical.
Technical Context
This Zener diode functions in reverse-biased breakdown mode, delivering regulated voltage with temperature coefficient of +0.06 %/°C (typical) across its operating range. Its 28 Ω dynamic impedance ensures minimal output variation under load transients up to 10 mA.
The device uses alloy-42 leadframe with matte tin annealed terminations, rated for 470 mW power dissipation at 25 °C ambient on standard FR-4 PCB, and exhibits 425 °C/W thermal resistance when mounted with minimum recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.23–20.22 V @ IZT = 10 mA - defines precise regulation window for feedback loops |
| Zener Impedance (ZZT) | 28 Ω max @ f = 1 kHz - limits AC ripple coupling into reference node |
| Reverse Leakage (IR) | 0.05 µA max @ VR = 15.0 V - enables ultra-low quiescent current bias networks |
| Power Dissipation (PD) | 470 mW @ TA = +25°C - supports continuous operation in compact PCB layouts |
| Thermal Resistance (RθJA) | 425 °C/W (min pad layout) - determines junction temperature rise under steady-state bias |
| Operating Temperature | –65 °C to +150 °C - suitable for industrial and automotive under-hood environments |
| Package | SOD123 - 2-pin surface-mount outline compatible with automated pick-and-place |
Pinout & Package
Package: SOD123 - molded plastic case with cathode band marking; dimensions: L = 0.25–0.40 mm, D = 1.40–1.70 mm, E = 2.55–2.85 mm, He = 3.55–3.85 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in shunt regulator configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 20 V reference point; marked by visible band on package body |
Key Features
| Feature | Design Value |
|---|---|
| Very tight VZ tolerance | ±2.5% total spread (19.23–20.22 V) enables single-bin calibration in production |
| Low zener impedance | 28 Ω max ensures <10 mV output shift under 1 mA load step in feedback paths |
| Ultra-low leakage | 0.05 µA max at 75% VZ preserves accuracy in high-impedance sensor bias networks |
| Automated assembly ready | SOD123 footprint and matte tin terminations support IPC-A-610 Class 2 reflow profiles |
| Green & RoHS compliant | Halogen-free (<900 ppm Br+Cl), antimony-free, lead-free per EU Directive 2015/863/EU |
Applications
| Industrial Power Monitoring | Automotive Sensor Biasing |
|---|---|
|
Use Scenario: Monitoring 24 V rail voltage in PLC I/O modules using resistive divider into ADC input. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 20 V reference for ratio-metric scaling. Use Value: Tight VZ tolerance eliminates need for post-calibration trimming in field-deployed units. |
Use Scenario: Biasing NTC thermistors in engine coolant temperature sensors. IC Role / Device Role / Timing Role: Precision voltage source establishing known current through thermistor string. Use Value: Low leakage and stable TC ensure <±0.5°C measurement error over –40°C to +125°C. |
| Medical Instrumentation Reference | Telecom Line Card Protection |
|
Use Scenario: Providing reference for isolated 12-bit DAC in portable ECG front-end. IC Role / Device Role / Timing Role: Low-noise DC reference for DAC output stage calibration. Use Value: 28 Ω ZZT suppresses switching noise coupling from adjacent DC-DC converters. |
Use Scenario: Clamping transient surges on 19 V telecom power bus before PMIC input. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp limiting peak excursion to 20.22 V. Use Value: 470 mW PD rating sustains 100 ms surge events without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20LT1G | 20 V nominal, ±5% tolerance, 50 Ω ZZT, SOT-23 package | Higher impedance and looser tolerance reduce accuracy in metrology-grade references | Select when board space allows SOT-23 and ±5% regulation is acceptable |
| MMSZ5248B-TP | 20 V nominal, ±5% tolerance, 30 Ω ZZT, SOD-123 package | Same footprint but higher leakage (1 µA @ 16 V) degrades high-Z bias networks | Prefer only if cost sensitivity outweighs leakage-critical performance |
Compared with BZX84-C20LT1G and MMSZ5248B-TP, DDZ20C-7 offers tighter voltage tolerance and lower leakage-critical for high-accuracy feedback and sensor biasing-while maintaining identical SOD123 mounting and thermal profile.
Availability
DDZ20C-7 is available at Aetrix Electronics and suitable for industrial power monitoring, automotive sensor biasing, medical instrumentation reference, and telecom line card protection requiring stable component supply and long-term lifecycle continuity.
Supply support for DDZ20C-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 distribution operations across Asia, Europe, and North America.
The DDZ series belongs to Diodes' precision Zener diode product line, engineered specifically for high-stability voltage reference and regulation in space-constrained, thermally demanding applications.
FAQ
What is the maximum power dissipation for DDZ20C-7 at 75°C ambient?
At 75°C ambient, DDZ20C-7 is rated for 500 mW power dissipation per the datasheet's Note 6. This derating reflects improved thermal transfer when lead temperature (TL) is controlled, such as with larger copper pours or heatsinking via the cathode/anode pads.
Is DDZ20C-7 qualified for automotive use?
No-DDZ20C-7 is the commercial-grade variant. The automotive-qualified version is DDZ20CQ-7, which carries AEC-Q101 qualification, PPAP capability, and is manufactured in IATF16949-certified facilities. The "Q" suffix denotes automotive compliance.
How does the temperature coefficient affect regulation accuracy over –40°C to +125°C?
DDZ20C-7 exhibits a typical temperature coefficient of +0.06 %/°C (Fig. 17). Over a 165°C span, this contributes ~9.9 mV drift (0.06% × 20 V × 165), well within its ±2.5% initial tolerance band-making it suitable for wide-temperature applications without active compensation.
Can DDZ20C-7 replace older 1N4746A Zeners in existing designs?
Yes-DDZ20C-7 matches the 20 V nominal rating of 1N4746A and fits the same SOD123 footprint. However, it improves upon 1N4746A with tighter tolerance (±2.5% vs ±10%), lower ZZT (28 Ω vs 25 Ω typical but unspecified max), and guaranteed green/RoHS compliance, enabling direct drop-in upgrades.
DDZ20C-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):
- 20 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
DDZ20C-7 FAQ
1.How can I place an order for DDZ20C-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ20C-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 DDZ20C-7 reliable?
The price and inventory of DDZ20C-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ20C-7 is usually 5 days.
3.What payment methods are accepted for DDZ20C-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ20C-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ20C-7?
DDZ20C-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ20C-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 DDZ20C-7?
For technical support, including DDZ20C-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ20C-7 requirements.
6.How does Aetrix verify that DDZ20C-7 is sourced from the original manufacturer or authorized distributors?
All DDZ20C-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 DDZ20C-7 meets industry standards.
7.What is the process for return or replacement of DDZ20C-7?
All DDZ20C-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ20C-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 DDZ20C-7 part is unused and in its original packaging.
Return procedure for DDZ20C-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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