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Diodes Incorporated DDZ9705-7
- Part No.:
- DDZ9705-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ9705-7.pdf
- Description:
- DIODE ZENER 18V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:74,176
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Product details
Overview
DDZ9705-7 from Diodes Incorporated is a surface-mount low-current Zener diode with a nominal zener voltage of 18 V (min 17.10 V, max 18.90 V), rated for 500 mW power dissipation on FR-4 PCB at TL = +75°C, and specified at 50 µA test current - ideal for low-bias, battery-powered voltage reference and regulation in portable electronics.
For engineers reviewing the DDZ9705-7 datasheet, DDZ9705-7 pinout, DDZ9705-7 application, or DDZ9705-7 equivalent, this device serves as a precision shunt voltage reference in power supply feedback paths, overvoltage protection circuits, and analog signal conditioning where stable low-current regulation is required.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its terminals under controlled current conditions. Its 50 µA test current enables accurate regulation in ultra-low-power systems, and its SOD123 package supports automated assembly while delivering thermal resistance of 150 °C/W (junction-to-lead) and 340 °C/W (junction-to-ambient).
The device exhibits a temperature coefficient of approximately +0.07 %/°C near 18 V (per Fig. 18), enabling predictable drift behavior in ambient temperature ranges from –65 °C to +150 °C. Reverse leakage remains ≤0.05 µA at VR = 13.6 V, ensuring minimal quiescent current draw in standby operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 18 V - stable reference point for feedback loops and voltage clamping at typical operating current |
| Zener Voltage Range | 17.10 V to 18.90 V - ensures production yield compliance and design margin for 18 V nominal target |
| Test Current (IZT) | 50 µA - enables use in micro-power applications such as coin-cell-powered sensors and wearables |
| Max Reverse Leakage (IR) | 0.05 µA @ VR = 13.6 V - guarantees negligible current drain in high-impedance bias networks |
| Power Dissipation | 500 mW - supports continuous operation on standard FR-4 PCB with 1-inch² copper pad at +75°C lead temperature |
| Package | SOD123 - industry-standard 2-pin surface-mount outline compatible with reflow and wave soldering |
| Operating Temp | –65 °C to +150 °C - suitable for industrial and automotive under-hood environments |
Pinout & Package
DDZ9705-7 uses the SOD123 surface-mount plastic package with cathode band marking. The device has two terminals: anode and cathode. Cathode identification is via a visible band on the component body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in shunt regulator configuration | Connected to system ground or lowest potential point in voltage reference circuit |
| Cathode | Input/output reference node | Connected to regulated output or feedback point; carries reverse breakdown current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current (50 µA) | Enables stable voltage reference in nanoampere-bias circuits without compromising accuracy |
| 500 mW power rating on FR-4 | Supports robust operation in space-constrained PCB layouts without external heatsinking |
| SOD123 package with matte tin finish | Ensures reliable solderability per MIL-STD-202 and compatibility with lead-free reflow profiles |
| AEC-Q101 qualified variant available (DDZ9705Q-7) | Validated for automotive applications requiring PPAP documentation and IATF 16949 manufacturing control |
Applications
| Battery Voltage Monitor | USB-C Power Delivery Feedback |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage in portable medical devices to trigger low-battery alerts before shutdown. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 18 V threshold for comparator input. Use Value: Enables accurate state-of-charge estimation using only passive components and microamp-level current draw. |
Use Scenario: Providing stable reference for error amplifier in USB-C PD sink controller feedback loop. IC Role / Device Role / Timing Role: Zener-based voltage clamp setting VREF for isolated feedback optocoupler bias. Use Value: Maintains ±5% regulation tolerance across temperature while consuming <1 µA quiescent current. |
| Industrial Sensor Signal Conditioning | Automotive Cabin Controller Reference |
|
Use Scenario: Biasing op-amp input stage in 4–20 mA transmitter for pressure sensor output linearization. IC Role / Device Role / Timing Role: Precision shunt reference establishing common-mode voltage for rail-to-rail input amplifiers. Use Value: Delivers 18 V reference stability within ±1.5% over –40 °C to +85 °C ambient range. |
Use Scenario: Supplying reference voltage for HVAC actuator position feedback ADC in vehicle cabin control module. IC Role / Device Role / Timing Role: AEC-Q101-compliant voltage reference ensuring functional safety integrity in ASIL-B subsystems. Use Value: Guarantees long-term drift <100 ppm/°C and qualification for 15-year automotive service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | Same 18 V nominal, but rated for 300 mW and specified at 5 mA test current | Higher IZT increases power consumption; less suitable for sub-10 µA bias networks | Select when higher current drive capability is needed and thermal budget allows |
| MMSZ4689-TP | 18 V nominal, 500 mW rating, but specified at 4.4 mA test current and higher Zz (35 Ω vs. ~25 Ω) | Higher dynamic impedance reduces regulation accuracy under varying load conditions | Prefer for cost-sensitive consumer applications where tight voltage tolerance is secondary |
Compared with BZX84-C18LT1G and MMSZ4689-TP, DDZ9705-7 delivers superior low-current regulation fidelity at 50 µA, lower dynamic impedance, and tighter production voltage spread - making it optimal for precision, ultra-low-power reference designs.
Availability
DDZ9705-7 is available at Aetrix Electronics and suitable for battery management systems, USB-C power delivery controllers, industrial 4–20 mA transmitters, and automotive cabin control modules requiring stable component supply with traceable sourcing and long-lifecycle support.
Supply support for DDZ9705-7 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, specializing in high-reliability, energy-efficient components for industrial, automotive, and consumer markets.
DDZ9705-7 belongs to the DDZ9678–DDZ9717 family of low-current Zener diodes engineered specifically for precision voltage reference and regulation in space- and power-constrained applications.
FAQ
What is the maximum reverse voltage (VR) at which DDZ9705-7 guarantees IR ≤ 0.05 µA?
Per the Electrical Characteristics table, DDZ9705-7 guarantees IR ≤ 0.05 µA at VR = 13.6 V. This value corresponds to 75% of its nominal 18 V zener voltage and defines the upper limit of safe non-breakdown operation before entering regulation.
Can DDZ9705-7 be used in place of a 15 V Zener in a feedback divider?
No - DDZ9705-7 is a fixed 18 V device with no internal trimming or adjustability. Substituting it for a 15 V Zener would raise the regulated output voltage by ~20%, potentially exceeding downstream IC absolute maximum ratings and invalidating loop compensation.
Is the SOD123 package of DDZ9705-7 compatible with IPC-7351B Class B land patterns?
Yes - Diodes Incorporated's published SOD123 footprint (document DS30410, page 7) aligns with IPC-7351B Class B recommendations: 0.57 mm terminal width (b), 1.55 mm body width (D), and 2.65 mm body length (E), supporting reliable solder joint formation and thermal relief.
Does DDZ9705-7 require derating above +75°C ambient temperature?
Yes - power dissipation must be linearly derated above +75°C ambient per Fig. 1: PD decreases by 3.53 mW/°C (500 mW ÷ 141.5 °C thermal delta), reaching zero at +150°C junction temperature. Derating applies regardless of PCB copper area beyond the minimum 1-inch² pad.
DDZ9705-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 50 nA @ 13.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
DDZ9705-7 FAQ
1.How can I place an order for DDZ9705-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ9705-7 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 DDZ9705-7 reliable?
The price and inventory of DDZ9705-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ9705-7 is usually 5 days.
3.What payment methods are accepted for DDZ9705-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ9705-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ9705-7?
DDZ9705-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ9705-7 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 DDZ9705-7?
For technical support, including DDZ9705-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ9705-7 requirements.
6.How does Aetrix verify that DDZ9705-7 is sourced from the original manufacturer or authorized distributors?
All DDZ9705-7 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 DDZ9705-7 meets industry standards.
7.What is the process for return or replacement of DDZ9705-7?
All DDZ9705-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ9705-7, 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 DDZ9705-7 part is unused and in its original packaging.
Return procedure for DDZ9705-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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