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Diodes Incorporated UDZ4V7B-7
- Part No.:
- UDZ4V7B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
UDZ4V7B-7.pdf
- Description:
- DIODE ZENER 4.7V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:985
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Product details
Overview
UDZ4V7B-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 4.7 V (min 4.55 V, max 4.75 V), 200 mW power dissipation, 100 Ω zener impedance at 5 mA, and ±1% voltage tolerance. It operates from −65 °C to +150 °C and is AEC-Q101 qualified for automotive-grade reliability in voltage reference and overvoltage protection circuits.
For engineers reviewing the UDZ4V7B-7 datasheet, UDZ4V7B-7 pinout, UDZ4V7B-7 application, or UDZ4V7B-7 equivalent, key selection criteria include zener voltage tightness (±1%), low dynamic impedance (100 Ω @ 5 mA), SOD323 package compatibility with high-density PCB layouts, and automotive qualification status per AEC-Q101.
Technical Context
This device functions as a two-terminal voltage reference diode operating in reverse breakdown mode. Its sharp knee characteristics and low zener impedance ensure stable regulation under varying load currents up to 5 mA, with minimal voltage drift across temperature.
The SOD323 package enables automated placement and reflow soldering, while its 625 °C/W junction-to-ambient thermal resistance requires careful PCB pad layout per Diodes' recommended footprint to maintain rated 200 mW power dissipation at +25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.55–4.75 V at IZT = 5 mA - defines precise regulation point for low-voltage reference design |
| Power Dissipation (PD) | 200 mW - maximum continuous power handling on FR-4 board with recommended pad layout |
| Zener Impedance (ZZT) | 100 Ω @ 5 mA - ensures minimal output voltage variation under small-signal current changes |
| Reverse Current (IR) | 2 µA @ VR = 1.0 V - guarantees low leakage in standby or sensing circuits |
| Operating Temperature | −65 °C to +150 °C - supports extended-range industrial and automotive under-hood applications |
| Qualification | AEC-Q101 qualified - validated for automotive electronic systems requiring high reliability |
Pinout & Package
Package: SOD323 - ultra-small surface-mount plastic case (1.30 mm × 1.70 mm × 0.90 mm), cathode identified by band marking, matte tin-plated terminals, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference node | Connected to lower potential side in zener regulator configuration; forms reference ground return path |
| Cathode | Reverse breakdown terminal / Zener voltage output node | Marked with band; connected to regulated voltage rail; supplies stable 4.7 V reference when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| Very tight zener voltage tolerance | ±1% (4.55–4.75 V) - eliminates need for post-production trimming in precision reference designs |
| Sharp breakdown knee | Low knee current (IZK = 0.5 mA) - enables stable regulation even at sub-mA bias currents |
| Automated assembly compatibility | SOD323 package with J-STD-020D Level 1 moisture rating - supports high-yield pick-and-place and lead-free reflow |
| Environmental compliance | Fully RoHS-compliant, halogen- and antimony-free "Green" construction - meets global environmental regulations without performance trade-offs |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 4.7 V reference for microcontroller ADC inputs monitoring battery voltage and door lock status. IC Role / Device Role / Timing Role: Precision voltage reference for analog front-end signal scaling and offset correction. Use Value: Enables accurate 12-bit ADC conversion across −40 °C to +125 °C ambient with <±5 mV drift due to tight 4.7 V tolerance and low TC. | Use Scenario: Regulating supply to MEMS pressure sensor ICs in factory automation transmitters. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference for sensor excitation and analog output stage. Use Value: Maintains sensor full-scale accuracy within ±0.25% over temperature using 100 Ω zener impedance and AEC-Q101 reliability. |
| USB-C Power Delivery Monitor | Medical Diagnostic Equipment Reference |
Use Scenario: Biasing voltage dividers that feed feedback signals to USB PD controller ICs for VBUS regulation. IC Role / Device Role / Timing Role: Stable reference node for resistive feedback network in isolated DC-DC control loop. Use Value: Ensures ±1% VBUS setpoint accuracy across input transients and thermal cycling, critical for USB-IF compliance. | Use Scenario: Generating calibrated reference for ECG amplifier gain stages in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-leakage (2 µA @ 1 V) voltage reference enabling high-impedance biopotential signal paths. Use Value: Prevents baseline drift and preserves >100 dB CMRR by minimizing reverse-bias current injection into sensitive analog nodes. |
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 |
|---|---|---|---|
| BZX384-B4V7 | Zener voltage 4.66–4.74 V (±1%), 300 mW PD, SOD323 package, no AEC-Q101 qualification | Higher power rating but unqualified for automotive use; suitable for commercial-grade instrumentation | Select when higher power margin is needed and automotive qualification is not required |
| MMSZ4704T1G | Zener voltage 4.5–4.9 V (±5%), 500 mW PD, SOD123 package, AEC-Q101 qualified | Looser voltage tolerance and larger footprint; better thermal performance but less precision | Select when cost and thermal robustness outweigh tight voltage tolerance requirements |
Compared with BZX384-B4V7 and MMSZ4704T1G, UDZ4V7B-7 uniquely delivers ±1% voltage accuracy, AEC-Q101 qualification, and SOD323 size in one device-making it optimal for space-constrained automotive and industrial reference designs where precision and reliability are co-prioritized.
Availability
UDZ4V7B-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor transmitters, USB-C power delivery monitors, and medical diagnostic equipment requiring stable component supply and long-term lifecycle continuity.
Supply support for UDZ4V7B-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 North America.
The UDZ series belongs to Diodes' precision Zener diode product line, engineered specifically for high-accuracy voltage reference and overvoltage protection in automotive, industrial, and computing applications where tight tolerance and reliability are mandatory.
FAQ
What is the maximum reverse current specification for UDZ4V7B-7 at 1.0 V?
The maximum reverse current (IR) for UDZ4V7B-7 is 2 µA when tested at VR = 1.0 V and TA = +25 °C. This low leakage ensures minimal error contribution in high-impedance reference and sensing circuits, especially critical in battery-powered or precision analog applications.
Is UDZ4V7B-7 suitable for lead-free reflow soldering processes?
Yes. UDZ4V7B-7 features matte tin-annealed terminals over Alloy 42 leadframe and is fully compatible with standard lead-free reflow profiles per JEDEC J-STD-020D. Its SOD323 package has moisture sensitivity level 1, eliminating bake requirements prior to assembly.
Does UDZ4V7B-7 have a specified temperature coefficient?
While the datasheet does not list a single numeric TC value for UDZ4V7B-7, Figure 7 shows typical TC behavior for 4.7 V-class devices in the UDZ6V2B–UDZ10B group, ranging from −0.02%/°C to +0.06%/°C. Actual unit-to-unit variation falls within this curve, supporting stable operation across −65 °C to +150 °C.
Can UDZ4V7B-7 be used in place of a 5.1 V Zener diode?
No. UDZ4V7B-7 is specified for 4.55–4.75 V zener voltage and is not interchangeable with 5.1 V devices like UDZ5V1B. Substituting would cause ~7% regulation error, potentially violating system voltage margin requirements. Use UDZ5V1B-7 for 5.1 V applications.
UDZ4V7B-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):
- 4.7 V
- Tolerance:
- ±2%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
UDZ4V7B-7 FAQ
1.How can I place an order for UDZ4V7B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for UDZ4V7B-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 UDZ4V7B-7 reliable?
The price and inventory of UDZ4V7B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDZ4V7B-7 is usually 5 days.
3.What payment methods are accepted for UDZ4V7B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDZ4V7B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDZ4V7B-7?
UDZ4V7B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDZ4V7B-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 UDZ4V7B-7?
For technical support, including UDZ4V7B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDZ4V7B-7 requirements.
6.How does Aetrix verify that UDZ4V7B-7 is sourced from the original manufacturer or authorized distributors?
All UDZ4V7B-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 UDZ4V7B-7 meets industry standards.
7.What is the process for return or replacement of UDZ4V7B-7?
All UDZ4V7B-7 units undergo pre-shipment inspection (PSI). If there is an issue with UDZ4V7B-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 UDZ4V7B-7 part is unused and in its original packaging.
Return procedure for UDZ4V7B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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