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onsemi BZX55C4V3RL
- Part No.:
- BZX55C4V3RL
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C4V3RL.pdf
- Description:
- DIODE ZENER 4.3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
BZX55C4V3RL from onsemi is a 500 mW, DO−35 (CASE 299) hermetically sealed glass Zener diode with nominal zener voltage of 4.3 V (min 4.0 V, max 4.6 V), 75 Ω maximum zener impedance at 5 mA test current, and 1 μA maximum reverse leakage at 1 V. It serves as a precision voltage reference or overvoltage clamp in low-power linear regulators, sensor biasing circuits, and microcontroller reset supervision.
For engineers reviewing the BZX55C4V3RL datasheet, pinout, applications, or equivalent options, key selection criteria include its ±5% tolerance (C-grade), ESD rating >16 kV HBM, thermal derating above 75°C, axial-lead DO−35 package compatibility with wave/soldering processes, and stable regulation under 5 mA to 90 mA operating current.
Technical Context
The BZX55C4V3RL uses silicon-oxide passivated junction technology for stable breakdown characteristics and low leakage. Its double-slug, metallurgically bonded glass construction ensures hermetic sealing and robust thermal performance up to +200°C junction temperature.
It operates with a cathode-band polarity indicator and requires no heatsinking below 75°C lead temperature; power dissipation derates linearly at 4.0 mW/°C above that threshold. The device exhibits a typical zener voltage temperature coefficient near 0 mV/°C for 4.3 V parts, minimizing drift across −65°C to +200°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.0 V min / 4.6 V max @ IZT = 5 mA - defines usable regulation window for reference or clamping |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous DC power before thermal derating applies |
| Zener Impedance (ZZT) | 75 Ω max @ IZT = 5 mA - determines regulation stiffness and AC ripple rejection capability |
| Reverse Leakage (IR) | 1 μA max @ VR = 1 V - ensures minimal quiescent current in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV) per HBM - supports handling in uncontrolled assembly environments without added protection |
| Operating Temp Range | −65°C to +200°C - enables use in automotive engine compartments and industrial outdoor enclosures |
| Package | DO−35 (CASE 299), axial-lead glass - compatible with standard through-hole insertion and wave soldering |
Pinout & Package
DO−35 (CASE 299) hermetically sealed glass package with axial leads: cathode indicated by single black band; anode is unbanded lead. Package dimensions: A = 3.05–5.08 mm (length), B = 1.52–2.29 mm (diameter), D = 0.46–0.56 mm (lead diameter), K = 25.4–38.1 mm (lead length).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of circuit; forms reference ground for shunt regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with black band; supplies regulated 4.3 V when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass seal | Prevents moisture ingress and long-term parameter drift in humid or corrosive environments |
| Double-slug construction | Improves thermal coupling between junction and leads, enabling higher pulsed power handling |
| ±5% zener tolerance (C-grade) | Provides tighter voltage accuracy than general-purpose Zeners while maintaining cost efficiency |
| Low 1 μA leakage @ 1 V | Minimizes loading error in high-resistance voltage divider networks and battery-powered sensors |
| 16 kV HBM ESD rating | Eliminates need for external ESD protection in board-level handling and final assembly |
Applications
| Microcontroller Reset Circuit | Sensor Bias Reference |
|---|---|
Use Scenario: Generating a clean, temperature-stable reset signal for 3.3 V or 5 V MCUs during power-up and brownout conditions. IC Role / Device Role / Timing Role: Shunt regulator providing precise 4.3 V threshold to reset supervisor IC or RC network. Use Value: Ensures deterministic reset assertion below 4.3 V with <1 μA leakage preserving RC timing integrity. |
Use Scenario: Supplying stable excitation voltage to resistive bridge sensors (e.g., strain gauges, RTDs) in data acquisition modules. IC Role / Device Role / Timing Role: Low-drift voltage reference source replacing higher-cost IC references where 5% tolerance is acceptable. Use Value: Delivers <±0.2 V variation over −40°C to +85°C ambient, sufficient for 12-bit ADC systems. |
| Overvoltage Clamp | Linear Regulator Feedback |
Use Scenario: Protecting downstream analog inputs (e.g., ADCs, op-amps) from transient surges exceeding 5 V rail. IC Role / Device Role / Timing Role: Fast-acting shunt clamp activated above 4.6 V, diverting excess current to ground. Use Value: Limits clamped voltage to ≤4.8 V with 75 Ω dynamic impedance, reducing stress on protected ICs. |
Use Scenario: Setting output voltage in adjustable linear regulators (e.g., LM317) via feedback divider. IC Role / Device Role / Timing Role: Precision reference node in resistor divider network controlling regulator feedback pin. Use Value: Enables accurate 5.0 V output with <0.5% error contribution from reference, assuming proper divider ratio. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | 5% tolerance, 5.1 V nominal, 500 mW, DO−41 package (larger than DO−35) | Higher voltage; requires PCB layout change due to larger footprint and different lead spacing | Select when 5.1 V reference is needed and board space allows DO−41 mounting |
| BZX85C4V3 | 5% tolerance, 4.3 V nominal, 1.3 W power rating, DO−41 package | Higher power handling but incompatible pin geometry and thermal profile; not drop-in | Choose only if >500 mW dissipation is required and mechanical redesign is acceptable |
Compared with BZX55C4V3RL, the 1N4733A offers higher voltage and same tolerance but demands layout revision, while BZX85C4V3 provides greater power capacity at the cost of package incompatibility and increased thermal mass-neither is pin-compatible, and both require validation of electrical and mechanical fit.
Availability
BZX55C4V3RL is available at Aetrix Electronics and suitable for microcontroller reset circuits, sensor bias references, overvoltage clamps, and linear regulator feedback networks requiring stable component supply with full traceability and lifecycle management.
Supply support for BZX55C4V3RL 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX55C4V3RL belongs to the BZX55C series of 500 mW Zener regulators designed for cost-sensitive, high-reliability applications demanding hermetic sealing, wide temperature operation, and robust ESD immunity in compact axial packages.
FAQ
What is the zener voltage tolerance of BZX55C4V3RL?
The "C" in BZX55C4V3RL denotes a ±5% zener voltage tolerance. Per the datasheet, its rated zener voltage is 4.3 V with a minimum of 4.0 V and maximum of 4.6 V at 5 mA test current (IZT). This tolerance is confirmed in Table 1 of the onsemi BZX55C2V4RL Series datasheet and applies specifically to the BZX55C4V3RL variant.
Can BZX55C4V3RL be used in surface-mount designs?
No, BZX55C4V3RL is an axial-lead DO−35 (CASE 299) glass package and is not suitable for surface-mount assembly. It requires through-hole mounting and wave or hand soldering. For SMT equivalents, consider the MMBZ5225B (SOT−23, 4.3 V) or BZX384-B4V3 (SOD−323), which are functionally similar but differ in package, thermal behavior, and test conditions.
What is the maximum reverse leakage current for BZX55C4V3RL at 25°C?
The maximum reverse leakage current (IR) for BZX55C4V3RL is 1 μA at VR = 1 V and TA = 25°C, as specified in the Electrical Characteristics table on page 3 of the onsemi datasheet. This value remains ≤1 μA up to 125°C ambient, supporting low-power biasing in precision analog circuits.
Does BZX55C4V3RL have a specified temperature coefficient?
Yes - Figure 4a in the onsemi datasheet shows the temperature coefficient (θVZ) for 4.3 V devices falls within ±2 mV/°C across −55°C to +150°C. This low drift enables stable reference performance in environments where ambient temperature varies significantly, such as industrial control panels or automotive cabin modules.
What is the peak surge power rating of BZX55C4V3RL for a 1 ms pulse?
Per Figure 7a of the datasheet, BZX55C4V3RL (within the 1.8 V–91 V group) has a peak nonrepetitive surge power rating of approximately 120 W for a 1 ms pulse width at 5% duty cycle and TJ = 25°C. This enables transient suppression of short-duration overvoltage events without permanent degradation.
BZX55C4V3RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- 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
BZX55C4V3RL FAQ
1.How can I place an order for BZX55C4V3RL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C4V3RL 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 BZX55C4V3RL reliable?
The price and inventory of BZX55C4V3RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C4V3RL is usually 5 days.
3.What payment methods are accepted for BZX55C4V3RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C4V3RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C4V3RL?
BZX55C4V3RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C4V3RL 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 BZX55C4V3RL?
For technical support, including BZX55C4V3RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C4V3RL requirements.
6.How does Aetrix verify that BZX55C4V3RL is sourced from the original manufacturer or authorized distributors?
All BZX55C4V3RL 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 BZX55C4V3RL meets industry standards.
7.What is the process for return or replacement of BZX55C4V3RL?
All BZX55C4V3RL units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C4V3RL, 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 BZX55C4V3RL part is unused and in its original packaging.
Return procedure for BZX55C4V3RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX55C4V3RL Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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