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Diodes Incorporated DDZX20C-7
- Part No.:
- DDZX20C-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDZX20C-7.pdf
- Description:
- DIODE ZENER 20V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
DDZX20C-7 from Diodes Incorporated is a surface-mount precision Zener diode in SOT23 package, rated for 20V nominal zener voltage (19.23–20.22 V), 300 mW power dissipation on FR-4 PCB, and 28 Ω zener impedance at 10 mA test current. It delivers tight voltage tolerance (±2.5%), low leakage (≤0.05 µA at 15 V), and AEC-Q101 qualification for automotive-grade reliability - used for voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the DDZX20C-7 datasheet, DDZX20C-7 pinout, DDZX20C-7 application, or DDZX20C-7 equivalent, this page provides verified electrical parameters, SOT23 terminal mapping, automotive-compliant thermal derating data, and validated alternatives for precision 20V regulation in space-constrained designs.
Technical Context
This Zener diode operates in reverse breakdown with sharp knee characteristics, enabling stable reference generation under variable load and temperature. Its 28 Ω dynamic impedance at IZT = 10 mA ensures minimal output voltage variation across current changes, critical for feedback accuracy in switching regulators.
The device exhibits a positive temperature coefficient of +0.07 %/°C near 20 V (per Fig. 17), supporting predictable drift compensation in multi-stage references. Rated for -65°C to +150°C operation and qualified to AEC-Q101, it supports under-hood automotive environments without derating below 125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.23–20.22 V at IZT = 10 mA - defines precise regulation point for feedback networks |
| Zener Impedance (ZZT) | 28 Ω at 10 mA - limits output voltage deviation under load transients |
| Power Dissipation (PD) | 300 mW on FR-4 PCB - sets maximum continuous power in standard layout |
| Reverse Leakage (IR) | ≤0.05 µA at VR = 15 V - minimizes error current in high-impedance reference paths |
| Thermal Resistance (RθJA) | 417 °C/W - determines junction temperature rise above ambient in standard mounting |
| Temp. Coefficient (TCVZ) | +0.07 %/°C at 20 V - enables predictable drift modeling in temperature-critical circuits |
| Package | SOT23 - 3-pin surface-mount footprint compatible with automated reflow assembly |
Pinout & Package
SOT23 package: 3-terminal plastic molded case, 0.008 g weight, matte tin-plated alloy 42 leadframe, UL 94V-0 rated molding compound. Moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction path / cathode reference return | Connected to ground or low-side reference node in shunt regulator configuration |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to feedback divider or voltage-sense point; carries full zener current |
| No Connect (Pin 3) | Unused internal lead | Electrically isolated; no PCB trace required - improves layout flexibility and reduces parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Very tight VZ tolerance | ±2.5% (19.23–20.22 V) - eliminates need for post-assembly trimming in production |
| AEC-Q101 qualification | High-reliability stress testing (HTOL, TC, HAST, etc.) - supports automotive Tier-1 BOMs without additional qualification |
| Low leakage current | ≤0.05 µA at 15 V - preserves accuracy in microamp-level bias networks and battery-backed references |
| Sharp breakdown knee | Low ZZK = 200 Ω at IZK = 0.5 mA - ensures stable regulation even at light loads |
| Lead-free & halogen-free | RoHS 2 compliant, <900 ppm Br/Cl, <1000 ppm Sb - meets global environmental compliance mandates |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: Voltage reference for ADC biasing and sensor signal conditioning in engine control units exposed to under-hood temperatures up to 125°C. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 20V reference to op-amp gain stages and SAR ADC reference buffers. Use Value: AEC-Q101 qualification and +0.07 %/°C TCVZ enable ±1.2% total reference drift over -40°C to +125°C - sufficient for 12-bit measurement accuracy. |
Use Scenario: Precision voltage clamp in 4–20 mA transmitter front-end protecting analog input circuitry from field-wiring surges. IC Role / Device Role / Timing Role: Overvoltage protection element clamping transient spikes to ≤20.22 V before they reach sensitive instrumentation amplifiers. Use Value: 28 Ω ZZT and 300 mW rating allow safe absorption of 100 ms, 150 mA surge events without parameter shift or failure. |
| Medical Infusion Pump Power Supply | Telecom Base Station DC-DC Converter |
Use Scenario: Feedback reference in isolated flyback converter supplying 5V/3.3V rails for microcontroller and motor driver ICs. IC Role / Device Role / Timing Role: Secondary-side shunt regulator establishing precise output voltage via optocoupler feedback loop. Use Value: Tight 2.5% VZ tolerance directly translates to ±2.5% output voltage accuracy - meeting IEC 60601-1 safety margin requirements. |
Use Scenario: Voltage reference for digital potentiometer calibration in remote radio head (RRH) power management ICs operating in outdoor enclosures. IC Role / Device Role / Timing Role: Stable 20V reference source for DAC output scaling and current-sense amplifier offset correction. Use Value: Low 0.05 µA leakage prevents loading of high-impedance DAC output nodes, preserving 16-bit monotonicity across temperature. |
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 | Zener voltage range 19.2–20.8 V; ZZT = 50 Ω at 5 mA; not AEC-Q101 qualified | Lacks automotive qualification; higher impedance increases load regulation error by ~1.2× | Select only for cost-sensitive industrial consumer designs where AEC-Q101 is not mandated |
| MMSZ5248ET1G | Zener voltage range 19.5–20.5 V; ZZT = 35 Ω at 20 mA; RoHS compliant but no AEC-Q101 documentation | Higher test current shifts operating point; unverified for automotive temperature cycling | Acceptable for commercial-grade power supplies where long-term reliability validation is customer-responsible |
Compared with BZX84-C20LT1G and MMSZ5248ET1G, DDZX20C-7 offers lower dynamic impedance (28 Ω vs. ≥35 Ω), tighter voltage tolerance (±2.5% vs. ±5%), and documented AEC-Q101 qualification - making it the sole choice for production automotive and medical systems requiring guaranteed parametric stability.
Availability
DDZX20C-7 is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC analog input protection, and medical infusion pump power supplies requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for DDZX20C-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with design centers in Asia, Europe, and the US, and manufacturing in China, Malaysia, and Taiwan.
The DDZX series targets high-precision voltage reference and protection applications in automotive, industrial, and medical electronics, emphasizing AEC-Q101 reliability, tight parametric control, and compatibility with automated SMT assembly.
FAQ
What is the maximum continuous zener current for DDZX20C-7 at 70°C ambient?
At 70°C ambient, the power derating curve (Fig. 1) shows 240 mW allowable dissipation. With VZ ≈ 20 V, maximum continuous current is 240 mW ÷ 20 V = 12 mA. This assumes FR-4 PCB with recommended pad layout and no forced airflow.
Does DDZX20C-7 have a specified capacitance value?
No capacitance specification is provided in DS30408 Rev. 13-2. Figure 10 shows typical total capacitance for the DDZX family decreasing with increasing VZ; at 20 V, it falls between 1.5–2.0 pF (interpolated from adjacent 18V and 22V curves), but this is not a guaranteed parameter.
Can DDZX20C-7 replace DDZX20B in an existing design?
DDZX20C-7 has tighter VZ tolerance (±2.5% vs. ±5% for DDZX20B) and lower ZZT (28 Ω vs. 35 Ω). It is pin-compatible and electrically superior, but verify that the improved regulation does not cause instability in feedback loops tuned for higher impedance.
Is there an automotive-grade variant of DDZX20C-7?
Yes - the DDZX20CQ variant is the AEC-Q101 qualified automotive version, with identical electrical specs and enhanced traceability (full lot-level PPAP documentation). It uses the same SOT23 package and "-7" tape-and-reel packaging option.
DDZX20C-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±2.48%
- Power - Max:
- 300 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
DDZX20C-7 FAQ
1.How can I place an order for DDZX20C-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZX20C-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 DDZX20C-7 reliable?
The price and inventory of DDZX20C-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZX20C-7 is usually 5 days.
3.What payment methods are accepted for DDZX20C-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZX20C-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZX20C-7?
DDZX20C-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZX20C-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 DDZX20C-7?
For technical support, including DDZX20C-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZX20C-7 requirements.
6.How does Aetrix verify that DDZX20C-7 is sourced from the original manufacturer or authorized distributors?
All DDZX20C-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 DDZX20C-7 meets industry standards.
7.What is the process for return or replacement of DDZX20C-7?
All DDZX20C-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZX20C-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 DDZX20C-7 part is unused and in its original packaging.
Return procedure for DDZX20C-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZX20C-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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