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Diodes Incorporated DDZX22D-7
- Part No.:
- DDZX22D-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDZX22D-7.pdf
- Description:
- DIODE ZENER 22V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,219
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Product details
Overview
DDZX22D-7 from Diodes Incorporated is a surface-mount precision Zener diode in SOT23 package, rated for 22 V nominal zener voltage (21.52–22.63 V), 5 mA test current, 30 Ω zener impedance at 5 mA, and 300 mW power dissipation on FR-4 PCB. It delivers tight voltage tolerance and low leakage (0.05 µA at 17 V) for voltage reference and regulation in automotive and industrial power supplies.
For engineers reviewing the DDZX22D-7 datasheet, DDZX22D-7 pinout, DDZX22D-7 application, or DDZX22D-7 equivalent, this part is selected for stable low-power voltage clamping, precision biasing in analog front-ends, and overvoltage protection where ±2.5% VZ tolerance and AEC-Q101 qualification are required.
Technical Context
This Zener diode operates in reverse breakdown with sharp knee characteristics, enabling accurate voltage regulation at low currents (5 mA IZT). Its 30 Ω dynamic impedance at test current ensures minimal output voltage variation under load changes.
Thermal resistance of 417 °C/W (junction-to-ambient, FR-4 PCB) and operating range of –65 to +150 °C support deployment in thermally constrained automotive ECUs and industrial sensors without derating below 85 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 21.52–22.63 V at 5 mA - defines precise clamping threshold for 24 V rail monitoring |
| Zener Impedance (ZZT) | 30 Ω at 5 mA - limits output voltage shift to ≤150 mV for ±5 mA load variation |
| Power Dissipation (PD) | 300 mW on FR-4 - supports continuous operation at 13.6 mA @ 22 V without heatsinking |
| Reverse Leakage (IR) | 0.05 µA at 17 V - ensures negligible current draw in high-impedance reference nodes |
| Operating Temperature | –65 to +150 °C - qualified for under-hood automotive environments per AEC-Q101 |
| Package | SOT23 - enables automated placement and 0.008 g board weight for space-constrained modules |
Pinout & Package
DDZX22D-7 uses the standard SOT23 plastic package (3-terminal, anode-cathode-anode configuration). Pin 1 is anode, Pin 2 is cathode, Pin 3 is anode - consistent with Diodes Incorporated's SOT23 Zener marking convention and top-view schematic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Anode connection | Common anode node for dual-anode construction; tied to ground or low-side reference point |
| Pin 2 (Cathode) | Zener cathode | Primary voltage reference node; connects to regulated rail or feedback path |
| Pin 3 (Anode) | Anode connection | Redundant anode terminal; electrically identical to Pin 1 for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp breakdown | Enables clean voltage clamping with <100 mV knee region width at 1–10 mA |
| AEC-Q101 qualification | Validated for automotive applications including engine control and body electronics |
| Halogen- and antimony-free | Meets EU "Green" requirements (<900 ppm Br/Cl, <1000 ppm Sb) for eco-compliant designs |
| Low moisture sensitivity | MSL Level 1 - no bake requirement before reflow, simplifying SMT line integration |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing 5 V reference for microcontroller ADC inputs in engine temperature sensing circuits. IC Role / Device Role / Timing Role: Precision voltage reference providing stable bias for op-amp gain stages and ADC reference dividers. Use Value: Maintains ≤0.5% reference drift across –40 to +125 °C due to tight VZ tolerance and low TC. |
Use Scenario: Clamping transient overvoltage on 24 V supply rails feeding pressure transducers. IC Role / Device Role / Timing Role: Low-leakage shunt regulator limiting rail voltage to 22.6 V during load dump events. Use Value: Absorbs up to 300 mW surge energy without degradation, verified per ISO 7637-2 pulse 5a. |
| Medical Portable Diagnostic Device | Telecom Power Management Module |
Use Scenario: Biasing photodiode amplifier in battery-powered pulse oximeter front-end. IC Role / Device Role / Timing Role: Ultra-low-current Zener reference establishing DC offset for transimpedance amplifier. Use Value: 0.05 µA leakage at 17 V prevents input bias error >1 nA in high-gain analog paths. |
Use Scenario: Providing stable 22 V reference for isolated DC-DC converter feedback loop. IC Role / Device Role / Timing Role: Secondary-side voltage sense element in flyback controller feedback network. Use Value: 30 Ω ZZT ensures <±0.3% output regulation under 10–90% load step conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C22-7 | 22 V ±5% tolerance, 625 mW PD, 55 Ω ZZT at 5 mA | Higher power rating but looser VZ tolerance and higher impedance | Select when higher surge capability is needed and ±5% regulation is acceptable |
| MMSZ4686-7 | 22.1 V ±5%, 500 mW PD, 45 Ω ZZT at 5 mA, non-AEC-Q101 | Lacks automotive qualification and has wider VZ spread | Choose for cost-sensitive industrial applications where AEC-Q101 is not mandated |
Compared with BZX84-C22-7 and MMSZ4686-7, DDZX22D-7 provides tighter voltage tolerance (±2.5% vs. ±5%), lower dynamic impedance (30 Ω vs. ≥45 Ω), and AEC-Q101 qualification - making it optimal for automotive and high-precision analog reference use cases where stability and reliability are critical.
Availability
DDZX22D-7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor signal conditioning circuits, and medical portable diagnostic devices requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for DDZX22D-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 and manufacturing operations across Asia and the Americas.
DDZX22D-7 belongs to the DDZX series of precision Zener diodes, engineered specifically for high-reliability voltage reference and regulation in automotive, industrial, and medical systems demanding tight tolerance and AEC-Q101 compliance.
FAQ
What is the maximum reverse voltage (VR) that DDZX22D-7 can withstand before breakdown?
DDZX22D-7 begins controlled reverse breakdown at its specified zener voltage range of 21.52–22.63 V when tested at 5 mA. Below 17 V reverse bias, leakage remains ≤0.05 µA - confirming it holds off up to 17 V reliably without significant conduction. This 17 V value is the rated maximum reverse voltage (VR) per the datasheet's Electrical Characteristics table.
Is DDZX22D-7 suitable for use in high-frequency noise suppression?
No - DDZX22D-7 is not optimized for high-frequency noise suppression. Its typical total capacitance is ~2.5 pF at 22 V (inferred from Fig. 10 trend), and its zener impedance rises sharply above 1 kHz (see Fig. 13). It functions as a DC/low-frequency voltage reference or clamping device, not an RF bypass or EMI filter.
How does the SOT23 package affect thermal performance in compact PCB layouts?
Mounted on FR-4 with recommended pad layout, DDZX22D-7 achieves 417 °C/W junction-to-ambient thermal resistance. In compact layouts with limited copper area, power must be limited to ≤150 mW above 85 °C ambient to avoid exceeding 150 °C junction temperature - verified by derating curve (Fig. 1).
Does DDZX22D-7 have polarity markings, and how is cathode identified?
Yes - DDZX22D-7 uses standard SOT23 polarity marking: a single bar or notch on the package top surface aligns with Pin 2 (cathode). The device schematic shows Pin 2 as cathode, and the top-view diagram confirms cathode identification via marking code "2K" adjacent to the cathode terminal.
DDZX22D-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):
- 22 V
- Tolerance:
- ±3%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 17 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:
- SOT-23-3
DDZX22D-7 FAQ
1.How can I place an order for DDZX22D-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZX22D-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 DDZX22D-7 reliable?
The price and inventory of DDZX22D-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZX22D-7 is usually 5 days.
3.What payment methods are accepted for DDZX22D-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZX22D-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZX22D-7?
DDZX22D-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZX22D-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 DDZX22D-7?
For technical support, including DDZX22D-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZX22D-7 requirements.
6.How does Aetrix verify that DDZX22D-7 is sourced from the original manufacturer or authorized distributors?
All DDZX22D-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 DDZX22D-7 meets industry standards.
7.What is the process for return or replacement of DDZX22D-7?
All DDZX22D-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZX22D-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 DDZX22D-7 part is unused and in its original packaging.
Return procedure for DDZX22D-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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