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onsemi BZX55C4V3_T50A
- Part No.:
- BZX55C4V3_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C4V3_T50A.pdf
- Description:
- DIODE ZENER 4.3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,126
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Product details
Overview
BZX55C4V3_T50A from ON Semiconductor (formerly Fairchild) is a 4.3 V ±5% tolerance, 500 mW glass-passivated Zener diode in DO-35 package, rated for 5 mA test current, 90 mA maximum Zener current, and 1 μA reverse leakage at 1 V, used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX55C4V3_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, power derating above 75°C, cathode-band polarity marking, thermal stability across –65°C to +200°C, and compatibility with through-hole PCB layouts requiring DO-35 footprint.
Technical Context
The BZX55C4V3_T50A operates as a precision shunt voltage regulator, maintaining stable 4.3 V output by conducting reverse current when input exceeds VZ. Its 75 Ω dynamic impedance at 5 mA ensures minimal voltage deviation under load variation.
Designed for DC biasing and overvoltage clamping, it features glass-passivated junction for enhanced reliability and moisture resistance, with thermal equilibrium measurement conditions defined at 30°C lead temperature and 3/8″ lead length per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.3 V nominal, min 4.0 V / max 4.6 V - defines regulated output voltage under 5 mA test current |
| Power Dissipation PD | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling before thermal derating |
| Dynamic Impedance ZZ | 75 Ω @ IZ = 5 mA - determines voltage regulation sensitivity to current changes |
| Reverse Leakage IR | 1 μA @ VR = 1 V - specifies off-state current limiting capability below breakdown |
| Max Zener Current IZM | 90 mA - derived from PD and VZ, limits safe peak surge current |
| Operating Temp Range | –65°C to +200°C - supports industrial and automotive under-hood environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal connections beyond anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal | Marked with color band; connected to higher potential side to enable voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-production trimming in cost-sensitive designs |
| Glass-passivated junction | Provides superior long-term stability and humidity resistance vs. epoxy-coated alternatives |
| DO-35 axial lead package | Supports manual soldering and wave-solder compatibility with standard 0.4 mm lead diameter |
| Thermal derating slope | 4.0 mW/°C above 75°C - allows accurate power budgeting in elevated ambient conditions |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 4.3 V reference for op-amp biasing or ADC voltage scaling in battery-powered sensors. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise DC operating point. Use Value: Maintains 4.3 V ±5% accuracy across temperature, enabling consistent analog signal conditioning without external feedback. | Use Scenario: Protecting microcontroller GPIO pins from transient surges exceeding 4.3 V in industrial control inputs. IC Role / Device Role / Timing Role: Passive clamping element diverting excess energy to ground. Use Value: Limits voltage to 4.6 V max during transients, preventing latch-up while drawing <1 μA at normal operation. |
| DC Bias Generator | Low-Cost Voltage Regulator |
Use Scenario: Setting gate bias voltage for JFET amplifiers in audio preamplifier stages. IC Role / Device Role / Timing Role: Fixed-voltage source defining transistor operating point. Use Value: Delivers stable 4.3 V with 75 Ω impedance, minimizing signal distortion from supply ripple coupling. | Use Scenario: Regulating 5 V rail down to 4.3 V for logic-level translation in legacy 4-bit MCU systems. IC Role / Device Role / Timing Role: Simple shunt regulator replacing linear ICs where efficiency is secondary to cost. Use Value: Achieves regulation with only one passive component and no quiescent current overhead beyond leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | Same 5.1 V rating not applicable; correct alternative is 1N4731A (4.3 V), but has 10% tolerance vs. BZX55C4V3_T50A's 5% | Higher voltage drift over temperature; less suitable for precision references | Select BZX55C4V3_T50A when ±5% tolerance and lower ZZ are required |
| MMSZ4V3 | SOD-123 surface-mount package, same 4.3 V ±5%, but 300 mW PD and 90 Ω ZZ | Not drop-in replaceable due to different footprint and lower power rating | Choose MMSZ4V3 only for space-constrained PCBs accepting reduced power margin |
Compared with 1N4731A and MMSZ4V3, the BZX55C4V3_T50A offers tighter voltage tolerance, higher power handling, and lower dynamic impedance-making it preferred for through-hole designs demanding stable regulation at moderate current levels.
Availability
BZX55C4V3_T50A is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, DC bias generation, and low-cost regulation requiring stable component supply across industrial, instrumentation, and embedded control applications.
Supply support for BZX55C4V3_T50A 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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete solutions for automotive, industrial, and consumer markets.
The BZX55 series was developed by Fairchild (now ON Semiconductor) to deliver cost-effective, reliable Zener diodes for general-purpose voltage regulation and protection in through-hole designs.
FAQ
What is the Zener voltage tolerance of BZX55C4V3_T50A?
The BZX55C4V3_T50A has a ±5% Zener voltage tolerance, meaning its nominal 4.3 V rating falls between 4.0 V and 4.6 V at 5 mA test current and 25°C. This tolerance is guaranteed per the original Fairchild datasheet Rev. D1 and applies across the full operating temperature range. The BZX55C4V3_T50A achieves tighter regulation than wider-tolerance alternatives like the 1N4731A, making it suitable for applications requiring predictable clamping thresholds.
What is the maximum power dissipation for BZX55C4V3_T50A?
The BZX55C4V3_T50A is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 4.0 mW/°C. This specification defines the upper limit of continuous power the BZX55C4V3_T50A can safely dissipate without exceeding junction temperature limits. Exceeding this rating risks thermal runaway or permanent degradation of the glass-passivated junction.
What package type does BZX55C4V3_T50A use?
The BZX55C4V3_T50A uses the DO-35 glass axial package, featuring a hermetically sealed glass body with axial leads and cathode identification via a color band. This package is standardized for through-hole mounting and supports wave soldering processes. The DO-35 footprint is distinct from surface-mount variants like SOD-123 (used by MMSZ4V3), so the BZX55C4V3_T50A requires dedicated through-hole pad layout.
How does BZX55C4V3_T50A compare to 1N4731A?
The BZX55C4V3_T50A and 1N4731A both provide 4.3 V Zener regulation, but the BZX55C4V3_T50A offers ±5% tolerance versus 1N4731A's ±10%, and lower dynamic impedance (75 Ω vs. ~95 Ω). The BZX55C4V3_T50A also specifies tighter reverse leakage (1 μA @ 1 V) and higher IZM (90 mA vs. ~76 mA). These differences make the BZX55C4V3_T50A preferable for precision reference applications where stability and regulation accuracy are critical.
What is the reverse leakage current specification for BZX55C4V3_T50A?
The BZX55C4V3_T50A exhibits a maximum reverse leakage current (IR) of 1 μA at VR = 1 V and TA = 25°C. This low leakage ensures minimal standby power draw when used as a voltage clamp or reference in battery-operated systems. The value remains stable up to 125°C per datasheet notes, supporting reliable operation in extended-temperature environments without significant increase in off-state current.
BZX55C4V3_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±7%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 75 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX55C4V3_T50A FAQ
1.How can I place an order for BZX55C4V3_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C4V3_T50A 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 BZX55C4V3_T50A reliable?
The price and inventory of BZX55C4V3_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C4V3_T50A is usually 5 days.
3.What payment methods are accepted for BZX55C4V3_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C4V3_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C4V3_T50A?
BZX55C4V3_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C4V3_T50A 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 BZX55C4V3_T50A?
For technical support, including BZX55C4V3_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C4V3_T50A requirements.
6.How does Aetrix verify that BZX55C4V3_T50A is sourced from the original manufacturer or authorized distributors?
All BZX55C4V3_T50A 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 BZX55C4V3_T50A meets industry standards.
7.What is the process for return or replacement of BZX55C4V3_T50A?
All BZX55C4V3_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C4V3_T50A, 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 BZX55C4V3_T50A part is unused and in its original packaging.
Return procedure for BZX55C4V3_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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