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onsemi BZX85C4V7
- Part No.:
- BZX85C4V7
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C4V7.pdf
- Description:
- DIODE ZENER 4.7V 1.3W DO41G
- Quantity:
- Payment:
- Shipping:
Inventory:48,117
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Product details
Overview
BZX85C4V7 from Fairchild Semiconductor is a 4.7 V, ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, designed for voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and precision biasing networks.
For engineers reviewing the BZX85C4V7 datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy at 45 mA test current, 13 Ω dynamic impedance, 1 μA leakage at 3.0 V reverse bias, and thermal derating above 50°C.
Technical Context
The BZX85C4V7 operates as a silicon planar Zener diode with sharp reverse breakdown characteristics, optimized for stable DC voltage reference under controlled power dissipation. Its junction temperature range of –65°C to +200°C supports operation in industrial and automotive environments.
Zener voltage is specified at 45 mA test current (IZ) with 4.4 V minimum and 5.0 V maximum, and dynamic impedance (ZZ) is measured at 45 mA while knee impedance (ZZK) is measured at 1 mA. Leakage current remains ≤1 μA at VR = 3.0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.4–5.0 V at IZ = 45 mA - defines regulated output voltage window under nominal bias |
| Tolerance | ±5% - ensures predictable voltage reference accuracy across production lots |
| Power Dissipation | 1.0 W @ TA = 25°C - sets maximum continuous power handling in free-air conditions |
| Zener Impedance | 13 Ω @ IZ = 45 mA - determines regulation stiffness and load transient response |
| Leakage Current | ≤1 μA @ VR = 3.0 V - guarantees minimal error current in high-impedance reference paths |
| Package | DO-41 glass axial - provides hermetic sealing, thermal stability, and JEDEC-standard mounting |
| Thermal Derating | 6.67 mW/°C above 50°C - enables safe power reduction in elevated ambient environments |
Pinout & Package
DO-41 glass axial package with cathode indicated by color band. Two-terminal device: anode and cathode leads extend axially from opposite ends of cylindrical glass body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in shunt regulation configuration |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input voltage source through series resistor; delivers stable 4.7 V reference |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage at 45 mA | Enables precise regulation without external trimming in fixed-voltage references |
| Low dynamic impedance (13 Ω) | Minimizes output voltage variation under changing load currents in feedback networks |
| Hermetically sealed DO-41 glass package | Ensures long-term parameter stability and moisture resistance in harsh environments |
| Wide operating temperature range | Supports reliable operation from –65°C to +200°C in industrial and under-hood applications |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in TL431-based or discrete op-amp feedback loops to regulate 5 V or 3.3 V outputs. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 4.7 V threshold for error amplifier comparison. Use Value: Tight ±5% tolerance and low ZZ ensure <±1% output regulation accuracy under line/load transients. | Use Scenario: Placed across sensitive IC inputs or bus lines to clamp transient spikes above 4.7 V. IC Role / Device Role / Timing Role: Passive crowbar element diverting surge current when reverse voltage exceeds VZ. Use Value: 1.0 W power rating allows absorption of short-duration ESD or inductive kick energy without failure. |
| Microcontroller Reset Circuit | ADC Reference Stabilization |
Use Scenario: Supplies clean reset threshold voltage to microcontroller reset pins during brown-out conditions. IC Role / Device Role / Timing Role: Precision voltage monitor generating logic-level reset signal when supply drops below 4.7 V. Use Value: Low 1 μA leakage prevents loading of RC timing network, preserving accurate reset delay timing. | Use Scenario: Provides stable 4.7 V reference for 10-bit or 12-bit analog-to-digital converters in sensor interfaces. IC Role / Device Role / Timing Role: Low-noise DC reference source replacing higher-cost precision voltage references. Use Value: DO-41 thermal stability minimizes drift over temperature, maintaining <±0.5 LSB error across –40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4732A | Same 4.7 V nominal VZ, but ±5% tolerance and 1.0 W rating in DO-41; ZZ = 15 Ω @ 45 mA | Identical functional role; slightly higher impedance may reduce regulation tightness in high-precision feedback | Preferred where legacy design documentation specifies 1N4732A footprint and sourcing is constrained |
| BZX55C4V7 | Same 4.7 V VZ and ±5% tolerance, but 500 mW power rating and DO-35 package | Limited to lower-power applications due to reduced dissipation; smaller DO-35 footprint requires PCB redesign | Select when board space is critical and thermal load remains below 0.5 W |
Compared with 1N4732A and BZX55C4V7, the BZX85C4V7 offers superior thermal robustness via its 1.0 W DO-41 rating and lower 13 Ω impedance, making it optimal for industrial power supplies requiring sustained regulation under variable load and ambient conditions.
Availability
BZX85C4V7 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, microcontroller reset networks, and ADC reference stabilization requiring stable component supply and long-lifecycle support.
Supply support for BZX85C4V7 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The BZX85C4V7 belongs to Fairchild's general-purpose Zener diode family, engineered for cost-effective, thermally stable voltage regulation in industrial and consumer power systems.
FAQ
What is the zener voltage tolerance of the BZX85C4V7?
The BZX85C4V7 has a guaranteed zener voltage tolerance of ±5%, meaning its actual breakdown voltage falls between 4.4 V and 5.0 V when tested at 45 mA. This tolerance is confirmed in the Electrical Characteristics table of the Fairchild datasheet Rev. 1.1.0 and applies across the full operating temperature range. The BZX85C4V7 maintains this specification without requiring external calibration or trimming.
What is the maximum power dissipation for the BZX85C4V7 at room temperature?
The BZX85C4V7 is rated for 1.0 W power dissipation at ambient temperature (TA) of 25°C, as stated in the Absolute Maximum Ratings table. This value assumes free-air convection cooling with no heatsinking. At lead temperature (TL) of 25°C and 4 mm distance from the glass package, the rating increases to 1.3 W. The BZX85C4V7 must be derated by 6.67 mW/°C above 50°C ambient.
Does the BZX85C4V7 have a specified forward voltage?
Yes - the BZX85C4V7 has a maximum forward voltage (VF) of 1.2 V at forward current (IF) of 200 mA, per the datasheet footnote on page 2. This parameter is relevant when the device is used in forward-biased configurations, such as polarity protection or clamping in AC-coupled circuits. The BZX85C4V7 exhibits standard silicon diode forward conduction behavior outside its zener region.
What package type does the BZX85C4V7 use, and how is polarity marked?
The BZX85C4V7 uses the DO-41 glass axial package per JEDEC DO-204AL standard. Polarity is marked by a single color band (typically black or dark gray) located near one end of the glass body - this band identifies the cathode terminal. The unmarked end is the anode. This marking convention is consistent across the entire BZX85C series and is verified in the Physical Dimensions section of the Fairchild datasheet.
How does the BZX85C4V7 compare to the BZX55C4V7 in terms of power handling?
The BZX85C4V7 supports 1.0 W power dissipation at 25°C, whereas the BZX55C4V7 is rated for only 500 mW in the smaller DO-35 package. This 2× higher power capability allows the BZX85C4V7 to sustain longer overvoltage events or operate at higher ambient temperatures without thermal runaway. For designs where thermal margin and reliability under intermittent surge conditions are critical, the BZX85C4V7 is the more robust choice.
BZX85C4V7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.7 V
- Tolerance:
- ±5%
- Power - Max:
- 1.3 W
- Impedance (Max) (Zzt):
- 13 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41G
BZX85C4V7 FAQ
1.How can I place an order for BZX85C4V7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C4V7 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 BZX85C4V7 reliable?
The price and inventory of BZX85C4V7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C4V7 is usually 5 days.
3.What payment methods are accepted for BZX85C4V7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C4V7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C4V7?
BZX85C4V7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C4V7 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 BZX85C4V7?
For technical support, including BZX85C4V7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C4V7 requirements.
6.How does Aetrix verify that BZX85C4V7 is sourced from the original manufacturer or authorized distributors?
All BZX85C4V7 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 BZX85C4V7 meets industry standards.
7.What is the process for return or replacement of BZX85C4V7?
All BZX85C4V7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C4V7, 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 BZX85C4V7 part is unused and in its original packaging.
Return procedure for BZX85C4V7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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