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Diodes Incorporated DDZ9687-7
- Part No.:
- DDZ9687-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ9687-7.pdf
- Description:
- DIODE ZENER 4.31V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,888
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Product details
Overview
DDZ9687-7 from Diodes Incorporated is a surface-mount low-current Zener diode in SOD123 package, rated for 4.3 V nominal zener voltage (min 4.09 V, max 4.52 V) at 50 µA test current, with 500 mW power dissipation on FR-4 PCB and 4 µA maximum reverse leakage at 2 V reverse bias. It serves as precision voltage reference or overvoltage clamp in portable battery-powered circuits.
For engineers reviewing the DDZ9687-7 datasheet, DDZ9687-7 pinout, DDZ9687-7 application, or DDZ9687-7 equivalent, key selection criteria include its low 50 µA test current suitability for ultra-low-power biasing, tight ±5% zener voltage tolerance, SOD123 footprint compatibility with automated assembly, and thermal resistance of 150 °C/W junction-to-lead.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation under low-current conditions. Its 4.3 V nominal zener voltage exhibits a temperature coefficient near zero crossing - typical for mid-range Zeners - enabling stable reference performance across -65°C to +150°C operating range.
The device uses alloy 42 leadframe with matte tin annealed finish, ensuring solderability per MIL-STD-202 Method 208 and compliance with J-STD-020 moisture sensitivity Level 1. Its SOD123 case meets UL 94V-0 flammability rating and supports reflow soldering profiles without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.3 V (min 4.09 V, max 4.52 V at IZT = 50 µA); enables precise low-voltage rail clamping in 3.3 V–5 V systems |
| Power Dissipation | 500 mW on FR-4 PCB at TL = +75°C; supports continuous operation in compact PCB layouts with minimal copper area |
| Reverse Leakage Current | ≤4 µA at VR = 2 V; ensures negligible quiescent current draw in battery-critical applications |
| Thermal Resistance (Junction-to-Lead) | 150 °C/W; allows direct thermal path to PCB copper for improved reliability in thermally constrained designs |
| Operating Temperature Range | -65°C to +150°C; qualified for industrial and extended-temperature automotive environments |
| Package | SOD123; 2.65 mm × 1.55 mm × 1.35 mm footprint compatible with standard pick-and-place equipment and IPC-7351B land patterns |
Pinout & Package
SOD123 surface-mount package with cathode band marking; single anode/cathode configuration. Molded plastic case (UL 94V-0), 0.01 g weight, matte tin annealed terminals on alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse breakdown reference node | Connected to lower-potential side of regulated circuit; defines polarity for voltage clamping |
| Cathode | Forward current exit / Zener breakdown output node | Marked with band; connected to higher-potential side; delivers stable 4.3 V reference when reverse biased |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - reduces standby power in always-on sensor nodes and RTC backup circuits |
| Automated assembly compatibility | SOD123 footprint and matte tin finish ensure high-yield placement and reflow without tombstoning or dewetting |
| Green material composition | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb); compliant with RoHS 3 and automotive "Green" definitions |
| Thermal performance | 150 °C/W RθJL enables reliable operation up to 150°C ambient without derating in thermally isolated layouts |
Applications
| Portable Battery Voltage Monitor | USB-C Power Delivery Clamp |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during charging via microcontroller ADC with internal 3.3 V reference. IC Role / Device Role / Timing Role: Zener diode provides 4.3 V clamping to protect ADC input from overvoltage during transient surges. Use Value: 4 µA leakage at 2 V prevents measurable battery drain over multi-year deployment in IoT sensors. | Use Scenario: Protecting USB-C CC line logic from 5 V bus transients during plug insertion/removal. IC Role / Device Role / Timing Role: Acts as fast-acting shunt clamp to limit CC pin voltage to ≤4.52 V, preserving PHY integrity. Use Value: 500 mW power rating sustains 100 ms surge events without thermal runaway in space-constrained Type-C connectors. |
| Industrial PLC Input Protection | Medical Wearable Reference |
Use Scenario: Conditioning 24 V DC field signal inputs down to 0–5 V range for analog input modules. IC Role / Device Role / Timing Role: Zener forms part of resistive divider network with active clamping to prevent overvoltage damage to op-amp front-end. Use Value: ±5% zener tolerance ensures consistent 4.3 V threshold across production batches, reducing calibration overhead. | Use Scenario: Providing stable bias for ultra-low-power ECG amplifier in disposable patch monitors. IC Role / Device Role / Timing Role: Supplies regulated 4.3 V reference to instrumentation amplifier supply rail, minimizing offset drift. Use Value: Low 50 µA test current enables operation directly from coin-cell battery without load-switching complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3-7-F | Same 4.3 V nominal zener voltage, but rated for 300 mW only and specified at 5 mA test current | Higher test current increases standby power; less suitable for sub-µA battery systems | Select DDZ9687-7 when <50 µA bias current and 500 mW thermal margin are required |
| MMSZ4V3T1G | 4.3 V zener, 500 mW rating, but reverse leakage is 10 µA at 2 V - more than double DDZ9687-7's 4 µA | Higher leakage degrades long-term battery life in energy-harvesting devices | Prefer DDZ9687-7 where leakage-limited runtime is critical, e.g., >5-year shelf life requirements |
Compared with BZX84-C4V3-7-F and MMSZ4V3T1G, DDZ9687-7 uniquely combines 50 µA test current, 4 µA leakage at 2 V, and 500 mW dissipation - making it optimal for ultra-low-power, thermally constrained, and long-life portable electronics.
Availability
DDZ9687-7 is available at Aetrix Electronics and suitable for portable medical wearables, industrial sensor nodes, USB-C interface protection, and battery management systems requiring stable component supply across multi-year production cycles.
Supply support for DDZ9687-7 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 DDZ9678–DDZ9717 series belongs to Diodes' low-current Zener diode product line, engineered specifically for precision voltage referencing and overvoltage protection in space- and power-constrained portable and automotive electronics.
FAQ
What is the maximum reverse voltage before breakdown for DDZ9687-7?
The DDZ9687-7 begins controlled reverse breakdown at a nominal 4.3 V, with guaranteed minimum and maximum values of 4.09 V and 4.52 V respectively, measured at 50 µA test current and 25°C ambient. Below 4.09 V, reverse leakage remains ≤4 µA at 2 V, confirming non-conductive behavior in pre-breakdown region.
Can DDZ9687-7 be used in automotive applications?
Yes - the automotive-grade variant DDZ9687Q-7 is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. The standard DDZ9687-7 is not automotive-qualified but shares identical electrical and thermal specifications; use DDZ9687Q-7 for safety-critical vehicle subsystems.
What is the thermal resistance from junction to ambient for DDZ9687-7?
DDZ9687-7 has a thermal resistance of 340 °C/W from junction to ambient air when mounted on FR-4 PCB with minimum recommended pad layout at TL = +75°C. This value assumes standard JEDEC test conditions and decreases significantly with increased copper area or thermal vias.
Does DDZ9687-7 have polarity marking, and how is it identified?
Yes - DDZ9687-7 uses a cathode band marking on the SOD123 package body. The banded end corresponds to the cathode terminal; the unmarked end is the anode. This matches industry-standard SOD123 polarity convention and is visible under 10× magnification during visual inspection or AOI.
DDZ9687-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.31 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 4 µA @ 2 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
DDZ9687-7 FAQ
1.How can I place an order for DDZ9687-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ9687-7 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 DDZ9687-7 reliable?
The price and inventory of DDZ9687-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ9687-7 is usually 5 days.
3.What payment methods are accepted for DDZ9687-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ9687-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ9687-7?
DDZ9687-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ9687-7 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 DDZ9687-7?
For technical support, including DDZ9687-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ9687-7 requirements.
6.How does Aetrix verify that DDZ9687-7 is sourced from the original manufacturer or authorized distributors?
All DDZ9687-7 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 DDZ9687-7 meets industry standards.
7.What is the process for return or replacement of DDZ9687-7?
All DDZ9687-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ9687-7, 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 DDZ9687-7 part is unused and in its original packaging.
Return procedure for DDZ9687-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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