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Diodes Incorporated UDZ4V3B-7
- Part No.:
- UDZ4V3B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
UDZ4V3B-7.pdf
- Description:
- DIODE ZENER 4.3V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,787
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Product details
Overview
UDZ4V3B-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 4.3 V (min 4.17 V, max 4.43 V), 200 mW power dissipation, 100 Ω zener impedance at 5 mA test current, and ±1% voltage tolerance. It operates from –65°C to +150°C and is AEC-Q101 qualified for automotive applications including voltage reference and overvoltage protection in power management circuits.
For engineers reviewing the UDZ4V3B-7 datasheet, UDZ4V3B-7 pinout, UDZ4V3B-7 application, or UDZ4V3B-7 equivalent, key selection criteria include zener voltage accuracy, low dynamic impedance, thermal stability, SOD323 package compatibility with high-density PCB layouts, and automotive-grade reliability certification.
Technical Context
This device functions as a two-terminal voltage reference by operating in reverse breakdown mode with sharp knee characteristics and tightly controlled voltage regulation. Its 100 Ω zener impedance at 5 mA ensures stable output under varying load conditions, while the 625 °C/W junction-to-ambient thermal resistance defines derating behavior on standard FR-4 PCBs.
The diode exhibits a typical temperature coefficient near zero for 4.3 V devices (per Fig. 7 interpolation), enabling stable reference performance across industrial temperature ranges. Cathode identification via band marking and matte tin–annealed terminals ensure reliable solderability and automated assembly compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 4.17–4.43 V at 5 mA - defines precise regulation window for low-voltage reference design |
| Power Dissipation | 200 mW - maximum continuous power handling on standard FR-4 layout |
| Zener Impedance | 100 Ω at 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Current | 5 µA at 1.0 V - guarantees low leakage in standby or sensing circuits |
| Operating Temp | –65°C to +150°C - supports under-hood automotive and industrial environments |
| Package | SOD323 - 1.3 mm × 1.7 mm surface-mount footprint for space-constrained designs |
| AEC-Q101 | Qualified - validated for automotive electronics per stress testing requirements |
Pinout & Package
Package: SOD323 - ultra-compact plastic surface-mount case with cathode band marking; dimensions: 1.30 mm (D) × 1.70 mm (E) × 0.30 mm (L); weight ≈ 0.004 g; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse bias reference ground node | Connected to lower-potential side in zener regulation; forms reference return path |
| Cathode | Reverse breakdown terminal / Regulated output node | Marked with band; supplies stable 4.3 V reference when biased above breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage regulation | ±1% tolerance (4.17–4.43 V) enables accurate analog reference without trimming |
| Sharp breakdown knee | Low knee resistance ensures rapid transition into regulation zone for fast transient response |
| Automated assembly compatibility | SOD323 package and matte tin terminals support reflow and wave soldering per MIL-STD-202 |
| Environmental compliance | Fully RoHS-compliant, halogen- and antimony-free "Green" construction per EU directives |
| Thermal robustness | Rated for –65°C to +150°C operation with defined derating curve up to 125°C ambient |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 4.3 V reference for microcontroller ADC inputs monitoring battery voltage and cabin sensors. IC Role / Device Role / Timing Role: Precision voltage reference for analog front-end calibration and sensor biasing. Use Value: Maintains measurement accuracy across temperature extremes due to low TC and tight voltage tolerance. | Use Scenario: Regulating supply to op-amp comparators in 4–20 mA loop transmitters. IC Role / Device Role / Timing Role: Low-power shunt regulator establishing clean reference rail for analog signal chain. Use Value: 100 Ω dynamic impedance minimizes output drift during loop current variations. |
| USB-C Power Delivery Monitor | Medical Portable Diagnostic Device |
Use Scenario: Clamping and referencing VBUS sense circuitry detecting 5 V negotiation states. IC Role / Device Role / Timing Role: Overvoltage protection and threshold reference for PD controller feedback. Use Value: Sharp breakdown and low leakage (<5 µA @ 1 V) prevent false triggers during idle states. | Use Scenario: Supplying reference voltage to low-noise instrumentation amplifiers in ECG front-ends. IC Role / Device Role / Timing Role: Stable DC reference source for biopotential signal conditioning. Use Value: AEC-Q101 qualification ensures reliability in portable medical equipment subject to vibration and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3 | Same 4.3 V nominal rating but ±5% tolerance; 350 mW power rating; SOT-23 package | Higher power handling but looser voltage accuracy; larger footprint than SOD323 | Select when higher dissipation is needed and tighter regulation is not required |
| MMSZ4685 | 4.3 V nominal, ±5% tolerance; 500 mW rating; SOD-123 package; no AEC-Q101 qualification | Higher power and larger package; lacks automotive qualification and low-impedance performance | Choose for cost-sensitive industrial use where qualification and precision are secondary |
Compared with BZX84-C4V3 and MMSZ4685, UDZ4V3B-7 delivers superior voltage accuracy (±1% vs. ±5%), lower dynamic impedance (100 Ω vs. ≥250 Ω), and automotive qualification-making it optimal for safety-critical or high-precision reference roles where SOD323 size constraints apply.
Availability
UDZ4V3B-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioners, USB-C power delivery monitors, and portable medical diagnostic devices requiring stable component supply and long-term lifecycle continuity.
Supply support for UDZ4V3B-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, serving automotive, industrial, computing, and consumer markets with high-reliability components.
The UDZ series belongs to Diodes' precision Zener diode product line, engineered specifically for voltage reference, regulation, and overvoltage protection in space-constrained, thermally demanding applications where accuracy and qualification matter.
FAQ
What is the maximum reverse current specification for UDZ4V3B-7 at 1.0 V?
The maximum reverse current is 5 µA at VR = 1.0 V, measured at TA = +25°C. This low leakage ensures minimal power loss in standby modes and prevents loading of high-impedance reference nodes in precision analog circuits.
Is UDZ4V3B-7 suitable for use in automotive applications?
Yes - UDZ4V3B-7 is AEC-Q101 qualified, meaning it has passed stress tests for temperature cycling, humidity, mechanical shock, and high-temperature operating life required for automotive electronics, including under-hood and infotainment systems.
How does the SOD323 package affect thermal performance?
The SOD323 package has a junction-to-ambient thermal resistance of 625 °C/W on standard FR-4 PCBs. At 200 mW dissipation, this results in a 125°C junction rise above ambient - requiring derating above 25°C ambient per the published power derating curve.
What is the significance of the "B9" marking code on UDZ4V3B-7?
The "B9" marking identifies the UDZ4V3B variant on the device top surface and corresponds to the 4.3 V zener voltage bin within the UDZ3V6B–UDZ15B family. It is used for traceability and automated optical inspection during assembly.
UDZ4V3B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±3.02%
- 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
UDZ4V3B-7 FAQ
1.How can I place an order for UDZ4V3B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for UDZ4V3B-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 UDZ4V3B-7 reliable?
The price and inventory of UDZ4V3B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDZ4V3B-7 is usually 5 days.
3.What payment methods are accepted for UDZ4V3B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDZ4V3B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDZ4V3B-7?
UDZ4V3B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDZ4V3B-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 UDZ4V3B-7?
For technical support, including UDZ4V3B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDZ4V3B-7 requirements.
6.How does Aetrix verify that UDZ4V3B-7 is sourced from the original manufacturer or authorized distributors?
All UDZ4V3B-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 UDZ4V3B-7 meets industry standards.
7.What is the process for return or replacement of UDZ4V3B-7?
All UDZ4V3B-7 units undergo pre-shipment inspection (PSI). If there is an issue with UDZ4V3B-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 UDZ4V3B-7 part is unused and in its original packaging.
Return procedure for UDZ4V3B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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