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Diodes Incorporated DDZ9678-7
- Part No.:
- DDZ9678-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ9678-7.pdf
- Description:
- DIODE ZENER 1.8V 470MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:257,188
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Product details
Overview
DDZ9678-7 from Diodes Incorporated is a surface-mount low-current Zener diode in SOD123 package, rated for 1.8 V nominal zener voltage (min 1.71 V, max 1.89 V) at 50 µA test current, with 500 mW power dissipation on FR-4 PCB at TL = +75°C and 0.9 V forward voltage at 10 mA. It serves as a precision voltage reference or low-power clamp in portable battery-powered circuits.
For engineers reviewing the DDZ9678-7 datasheet, DDZ9678-7 pinout, DDZ9678-7 application, or DDZ9678-7 equivalent, this part is selected for ultra-low-bias voltage regulation where thermal stability, RoHS/Green compliance, and automated assembly compatibility are critical - especially in space-constrained, low-quiescent-current designs.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage tolerance (±5% at 1.8 V), specified at a low 50 µA test current to minimize self-heating and enable stable operation in micro-power systems. Its 0.01 g mass and SOD123 footprint support high-density PCB layouts.
Thermal resistance from junction to ambient is 340 °C/W (FR-4, 1-inch² pad), and junction-to-lead is 150 °C/W, enabling predictable derating up to +150°C operating temperature. Reverse leakage is limited to 7.5 µA at VR = 1 V, confirming suitability for standby-mode voltage monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 1.8 V nominal (1.71–1.89 V range); enables precise low-voltage rail clamping or reference in 1.8 V logic domains. |
| Test Current (IZT) | 50 µA; allows stable regulation without loading weak bias sources in battery-backed or energy-harvesting circuits. |
| Power Dissipation (PD) | 500 mW at TL = +75°C on FR-4; supports continuous operation in thermally constrained consumer and IoT modules. |
| Forward Voltage (VF) | 0.9 V @ 10 mA; ensures minimal conduction loss when used bidirectionally or in protection configurations. |
| Reverse Leakage (IR) | 7.5 µA @ VR = 1 V; guarantees negligible standby current draw in always-on sensing nodes. |
| Package | SOD123; industry-standard 2-pin surface-mount outline (2.65 mm × 1.55 mm × 1.05 mm) compatible with standard pick-and-place and reflow processes. |
Pinout & Package
Package: SOD123 - molded plastic case (UL 94V-0), cathode indicated by band marking; terminals are matte tin annealed over Alloy 42 leadframe, solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-bias regulation; forms reference ground return path in shunt regulator topologies. |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with band; supplies stable 1.8 V reference when reverse-biased above breakdown threshold; ties to regulated rail or feedback node. |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - eliminates need for high-current bias networks, reducing system power overhead in coin-cell or energy-harvesting applications. |
| Automated assembly compatibility | SOD123 footprint and matte tin finish ensure reliable placement and solder joint formation in high-speed SMT lines without lead-free process adjustments. |
| Green & RoHS compliance | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb); meets EU RoHS 2015/863/EU and IATF 16949 manufacturing requirements. |
| Thermal performance | RθJA = 340 °C/W on FR-4 - enables accurate thermal modeling for compact PCBs with limited copper area. |
Applications
| Portable Medical Sensors | IoT Edge Node Power Management |
|---|---|
|
Use Scenario: Battery-powered wearable ECG front-end with ultra-low sleep current. IC Role / Device Role / Timing Role: Zener reference for ADC bias and LDO feedback divider. Use Value: 50 µA test current and 7.5 µA leakage preserve multi-week battery life; 1.8 V output matches MCU I/O voltage domain. |
Use Scenario: Sub-GHz wireless sensor node powered by CR2032 cell. IC Role / Device Role / Timing Role: Voltage clamp protecting RF transceiver GPIO during hot-swap or ESD events. Use Value: Fast reverse recovery and low capacitance (<2 pF at 1 V) prevent signal distortion on 2.4 GHz control lines. |
| Industrial Control Signal Conditioning | Automotive Body Electronics |
|
Use Scenario: 4–20 mA loop transmitter with isolated analog front-end. IC Role / Device Role / Timing Role: Precision shunt reference for current-sense amplifier offset calibration. Use Value: ±5% VZ tolerance and low TC (−0.06%/°C typical near 1.8 V) maintain accuracy across −40°C to +85°C ambient. |
Use Scenario: LIN bus node in door module with 12 V supply and local 1.8 V logic rail. IC Role / Device Role / Timing Role: Overvoltage clamp on microcontroller reset line during load dump transients. Use Value: AEC-Q101 qualified variant (DDZ9678Q) available; 500 mW rating absorbs short-duration spikes without failure. |
Availability
DDZ9678-7 is available at Aetrix Electronics and suitable for portable medical sensors, IoT edge node power management, and industrial control signal conditioning requiring stable component supply, consistent parametric performance, and full traceability.
Supply support for DDZ9678-7 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, computing, and automotive markets.
The DDZ9678 series belongs to Diodes' surface-mount Zener diode product line, engineered specifically for low-power voltage reference and overvoltage protection in space- and current-constrained applications.
FAQ
What is the maximum reverse voltage (VR) at which DDZ9678-7 maintains ≤7.5 µA leakage?
DDZ9678-7 guarantees ≤7.5 µA reverse leakage current at VR = 1 V, as specified in the Electrical Characteristics table. At higher reverse voltages below breakdown (e.g., 1.5 V), leakage increases nonlinearly and is not characterized - operation above 1 V but below VZ is not recommended for precision biasing.
Can DDZ9678-7 be used in place of a 1N4728A (3.3 V Zener)?
No - DDZ9678-7 is a 1.8 V Zener diode with 50 µA test current, while 1N4728A is a 3.3 V device rated at 76 mA test current and 1 W power dissipation. Their voltage ratings, power handling, thermal design, and bias requirements are incompatible; substituting one for the other would cause under-regulation or thermal runaway.
Is the SOD123 package of DDZ9678-7 compatible with IPC-7351B density levels?
Yes - the SOD123 footprint matches IPC-7351B "SOD-123" generic land pattern (density level N). Diodes Incorporated's recommended pad layout (documented in their package outlines) specifies 0.90 mm pad width, 0.95 mm pad length, and 1.05 mm center-to-center spacing - fully compliant with IPC-7351B nominal dimensions.
Does DDZ9678-7 exhibit significant voltage drift over temperature?
At 1.8 V, DDZ9678-7 has a typical temperature coefficient of −0.06 %/°C (per Fig. 17), resulting in ≈−1.08 mV/°C drift. Over −40°C to +125°C, total VZ shift is approximately ±90 mV - acceptable for non-critical biasing but insufficient for metrology-grade references without compensation.
DDZ9678-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 1.8 V
- Tolerance:
- ±5%
- Power - Max:
- 470 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1 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
DDZ9678-7 FAQ
1.How can I place an order for DDZ9678-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ9678-7 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 DDZ9678-7 reliable?
The price and inventory of DDZ9678-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ9678-7 is usually 5 days.
3.What payment methods are accepted for DDZ9678-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ9678-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ9678-7?
DDZ9678-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ9678-7 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 DDZ9678-7?
For technical support, including DDZ9678-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ9678-7 requirements.
6.How does Aetrix verify that DDZ9678-7 is sourced from the original manufacturer or authorized distributors?
All DDZ9678-7 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 DDZ9678-7 meets industry standards.
7.What is the process for return or replacement of DDZ9678-7?
All DDZ9678-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ9678-7, 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 DDZ9678-7 part is unused and in its original packaging.
Return procedure for DDZ9678-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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