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Diodes Incorporated UDZ3V9B-7
- Part No.:
- UDZ3V9B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
UDZ3V9B-7.pdf
- Description:
- DIODE ZENER 4.03V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:1,915
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Product details
Overview
UDZ3V9B-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 3.89–4.16 V, 200 mW power dissipation, 100 Ω zener impedance at 5 mA, and ±1% voltage tolerance. It features sharp breakdown characteristics, AEC-Q101 qualification, and SOD323 package for voltage regulation in low-power analog reference and power supply feedback circuits.
For engineers reviewing the UDZ3V9B-7 datasheet, UDZ3V9B-7 pinout, UDZ3V9B-7 application, or UDZ3V9B-7 equivalent, key selection criteria include zener voltage tightness (±1%), low dynamic impedance (100 Ω @ 5 mA), thermal resistance (625 °C/W), and automotive-grade reliability per AEC-Q101.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its design emphasizes low leakage (5 µA @ 1.0 V), sharp knee characteristics, and minimal temperature coefficient drift-especially critical in 3.3 V system biasing and ADC reference stabilization.
The device uses alloy 42 leadframe with matte tin annealed terminals, rated for -65°C to +150°C operation, and exhibits 0.02–0.06 %/°C typical TC over its operating range-enabling predictable performance in industrial sensor front-ends and automotive body control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 3.89–4.16 V @ 5 mA - defines precise regulation point for 3.3 V rail monitoring and LDO feedback |
| Power Dissipation | 200 mW - supports continuous operation in compact PCB layouts without forced cooling |
| Zener Impedance | 100 Ω @ 5 mA - ensures minimal output voltage variation under dynamic load transients |
| Reverse Leakage | 5 µA @ 1.0 V - maintains high impedance in standby, reducing quiescent current in battery-powered systems |
| Thermal Resistance | 625 °C/W - enables thermal derating to 100 mW at 75°C ambient on standard FR-4 board |
| Temperature Range | -65°C to +150°C - qualified for under-hood automotive and industrial control environments |
| AEC-Q101 | Qualified - certified for automotive electronics per stress test requirements including HTOL and TCT |
Pinout & Package
Package: SOD323 - ultra-compact 1.3 mm × 1.7 mm surface-mount case with cathode band marking, UL 94V-0 flammability rating, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms reference ground return path |
| Cathode | Zener breakdown terminal / voltage regulation output | Marked with band; connects to regulated node (e.g., feedback divider tap or reference input) |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Zener Voltage Tolerance | Enables direct replacement in 3.3 V reference designs without recalibration or resistor trimming |
| AEC-Q101 Qualification | Validated for automotive applications including infotainment power supplies and ADAS sensor biasing |
| SOD323 Package | Supports high-density PCB assembly and automated optical inspection (AOI) via standardized footprint |
| Lead-Free & Halogen-Free | Complies with RoHS 2 and JEDEC J-STD-020D Level 1, eliminating reflow compatibility concerns |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADCs measuring thermistor or strain gauge outputs in PLC I/O modules. IC Role / Device Role / Timing Role: Precision voltage reference source for analog front-end biasing and ratiometric measurement calibration. Use Value: Tight 3.89–4.16 V tolerance and <100 Ω dynamic impedance minimize ADC code spread across temperature. | Use Scenario: Providing regulated 3.3 V reference to microcontroller reset supervisor and CAN transceiver bias rails. IC Role / Device Role / Timing Role: Zener-based shunt regulator in low-current auxiliary power domain. Use Value: AEC-Q101 qualification and -65°C to +150°C operation ensure reliability in engine bay proximity mounting. |
| USB-C Power Delivery Feedback | IoT Edge Node Voltage Monitoring |
Use Scenario: Setting feedback threshold in buck converter controlling 5 V to 3.3 V conversion for USB-C PD sink applications. IC Role / Device Role / Timing Role: Zener element in resistive divider network defining output voltage setpoint. Use Value: Low 5 µA leakage at 1 V prevents loading error in high-impedance divider configurations. | Use Scenario: Monitoring battery voltage in BLE-enabled asset trackers using comparator hysteresis thresholds. IC Role / Device Role / Timing Role: Reference voltage source for window comparator detecting end-of-life battery drop below 3.4 V. Use Value: Sharp breakdown knee ensures clean transition between alert states with minimal hysteresis uncertainty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B3V9,115 | Same 3.9 V nominal, but ±5% tolerance and 300 mW rating; SOD323 package | Higher power margin but looser voltage spec; not AEC-Q101 qualified | Select when cost sensitivity outweighs precision or automotive compliance needs |
| MMSZ4685T1G | 3.9 V nominal, ±5% tolerance, 500 mW rating; SOD123 package (larger footprint) | Higher power handling but larger size and no automotive qualification | Prefer for non-automotive industrial designs requiring >200 mW headroom |
Compared with BZX384-B3V9,115 and MMSZ4685T1G, UDZ3V9B-7 delivers tighter voltage control and automotive qualification in the same compact SOD323 footprint-making it optimal for space-constrained, safety-aware 3.3 V reference designs.
Availability
UDZ3V9B-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control modules, and USB-C power delivery feedback requiring stable component supply and long-term lifecycle support.
Supply support for UDZ3V9B-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 sales operations across Asia, Europe, and the Americas.
The UDZ series belongs to Diodes' precision Zener diode product line, engineered specifically for high-stability voltage reference and regulation in automotive, industrial, and portable electronics where accuracy, reliability, and small form factor are essential.
FAQ
What is the maximum reverse current specification for UDZ3V9B-7?
The maximum reverse current (IR) is 5 µA at VR = 1.0 V, measured at TA = +25°C. This low leakage ensures minimal loading on high-impedance reference networks and preserves accuracy in battery-powered applications where quiescent current must be minimized.
Is UDZ3V9B-7 suitable for use in automotive applications?
Yes-UDZ3V9B-7 is AEC-Q101 qualified, meaning it has passed accelerated stress testing for temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. It is approved for use in automotive subsystems including body electronics, infotainment, and ADAS sensor interfaces.
How does the SOD323 package affect thermal performance?
The SOD323 package has a thermal resistance of 625 °C/W junction-to-ambient on standard FR-4 PCB with recommended pad layout. At 75°C ambient, power dissipation must be derated to ~100 mW to maintain junction temperature below 150°C-critical for sustained operation in enclosed enclosures or near heat sources.
Can UDZ3V9B-7 replace UDZ3V6B in a 3.3 V reference circuit?
No-UDZ3V6B has a 3.60–3.845 V zener range, while UDZ3V9B-7 is 3.89–4.16 V. Substituting introduces ~30 mV higher reference voltage, potentially shifting ADC full-scale or causing overvoltage on downstream 3.3 V logic. Verify circuit tolerance before interchange.
UDZ3V9B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 4.03 V
- Tolerance:
- ±3.35%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
UDZ3V9B-7 FAQ
1.How can I place an order for UDZ3V9B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for UDZ3V9B-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 UDZ3V9B-7 reliable?
The price and inventory of UDZ3V9B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDZ3V9B-7 is usually 5 days.
3.What payment methods are accepted for UDZ3V9B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDZ3V9B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDZ3V9B-7?
UDZ3V9B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDZ3V9B-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 UDZ3V9B-7?
For technical support, including UDZ3V9B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDZ3V9B-7 requirements.
6.How does Aetrix verify that UDZ3V9B-7 is sourced from the original manufacturer or authorized distributors?
All UDZ3V9B-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 UDZ3V9B-7 meets industry standards.
7.What is the process for return or replacement of UDZ3V9B-7?
All UDZ3V9B-7 units undergo pre-shipment inspection (PSI). If there is an issue with UDZ3V9B-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 UDZ3V9B-7 part is unused and in its original packaging.
Return procedure for UDZ3V9B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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