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onsemi 3EZ4.3D5RL
- Part No.:
- 3EZ4.3D5RL
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
3EZ4.3D5RL.pdf
- Description:
- DIODE ZENER 4.3V 3W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:54,000
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Product details
Overview
3EZ4.3D5RL from onsemi is a 3 W, 4.3 V ±5% Zener voltage regulator diode in DO−41 (Case 59) axial-leaded plastic package, rated for −65°C to +200°C operation, with 98 W surge capability at 1 ms and 174 Ω max Zener impedance at 4.5 mA test current-used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 3EZ4.3D5RL datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, ESD Class 3 (>16 kV HBM) rating, and real-world design implications for stable DC regulation under transient stress.
Technical Context
The 3EZ4.3D5RL operates as a silicon-oxide passivated junction Zener diode optimized for steady-state voltage clamping and low-impedance reference generation. Its 4.3 V nominal Zener voltage is specified at IZT = 4.5 mA, with guaranteed min/max of 4.09 V and 4.52 V, and exhibits 1.0 μA reverse leakage at VR = 4.1 V.
Thermal management relies on lead-to-ambient conduction: at TL = 75°C and 3/8″ lead length, it sustains 3 W continuous dissipation, derating linearly at 24 mW/°C above that temperature. Surge capability is defined per JEDEC for non-repetitive 1/120 s sine-equivalent pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V nominal, 4.09–4.52 V range at IZT = 4.5 mA - defines tight regulation band for feedback sensing |
| Power Dissipation | 3 W @ TL = 75°C, 1 W @ TA = 50°C - requires heatsinking or short leads for full-power operation |
| Zener Impedance | 174 Ω max @ IZT - impacts regulation accuracy under load transients |
| Surge Rating | 98 W @ 1 ms - supports transient overvoltage suppression without failure |
| ESD Rating | Class 3 (>16 kV HBM) - enables handling in standard assembly environments without special precautions |
| Operating Temp | −65°C to +200°C - suitable for under-hood automotive, industrial, and high-reliability embedded systems |
| Leakage Current | 1.0 μA max @ VR = 4.1 V - ensures minimal quiescent error in high-impedance reference paths |
Pinout & Package
DO−41 (Case 59) axial-leaded plastic package with cathode indicated by polarity band; leads are solderable, corrosion-resistant, and rated for 230°C for 10 seconds at 1/16″ from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode bias reference | Connected to lower-potential node in reverse-biased configuration; determines forward drop (VF ≤ 1.5 V @ 200 mA) |
| Cathode | Zener breakdown terminal / regulated output node | Connected to higher-potential rail; carries reverse current during regulation; marked by band |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener tolerance | Tight voltage binning enables predictable feedback loop setpoints without trimming |
| Surmetic 30 junction passivation | Stable long-term Zener voltage drift and low noise under DC stress |
| Pb-free compatible packaging | Meets RoHS requirements without performance trade-offs in thermal or electrical specs |
| Void-free transfer-molded case | Robust environmental sealing against moisture, dust, and mechanical stress |
| 1/16″ lead soldering limit | Enables reliable reflow or hand-soldering without internal delamination |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters via optocoupler-coupled feedback network. IC Role / Device Role / Timing Role: Zener diode provides precise 4.3 V reference for TL431 or optocoupler LED biasing. Use Value: Tight 4.09–4.52 V tolerance ensures ±1% output regulation accuracy across temperature and line variations. | Use Scenario: Protecting microcontroller I/O pins or analog front-end inputs from ESD or inductive kickback. IC Role / Device Role / Timing Role: Shunts transient energy to ground when input exceeds 4.3 V, limiting voltage rise rate. Use Value: 98 W surge rating at 1 ms absorbs >99% of common 8/20 µs surges without degradation. |
| Industrial Sensor Reference | Automotive Body Control Module |
Use Scenario: Providing stable excitation voltage for resistive bridge sensors (e.g., pressure, temperature) in PLC analog input modules. IC Role / Device Role / Timing Role: Serves as low-noise, temperature-stable reference source for ADC bias networks. Use Value: −65°C to +200°C operating range maintains regulation integrity in unheated enclosures or near engine bays. | Use Scenario: Clamping LIN bus or CAN transceiver supply rails against load-dump spikes in vehicle body electronics. IC Role / Device Role / Timing Role: Acts as primary overvoltage limiter before LDO regulators feeding MCU peripherals. Use Value: Class 3 ESD rating (>16 kV HBM) survives repeated connector mating cycles in factory and service environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | Same 5.1 V nominal, but ±5% tolerance and 1 W rating - lower power, higher Zener impedance (17 Ω) | Not suitable for 3 W sustained dissipation; limited to low-current references | Select only for space-constrained, low-power designs where thermal margin is ample |
| BZX55C4V3 | 4.3 V ±5%, 500 mW rating, DO-35 package - smaller footprint, lower surge (40 W @ 1 ms) | Lacks robustness for industrial surge environments; unsuitable for >0.5 W continuous use | Prefer for consumer-grade PCBs where cost and size outweigh reliability demands |
Compared with 1N4733A and BZX55C4V3, the 3EZ4.3D5RL delivers triple the power handling, superior surge immunity, and proven high-temp stability-making it the only choice for automotive, industrial, and mission-critical 4.3 V reference applications requiring long-term reliability.
Availability
3EZ4.3D5RL is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor reference designs requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for 3EZ4.3D5RL 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 focused on energy-efficient electronics, delivering high-performance analog, logic, discrete, and power management solutions.
The 3EZ4.3D5RL belongs to the Surmetic 30 Zener series-engineered for ruggedized voltage regulation in harsh environments, emphasizing thermal stability, surge resilience, and long-term parametric consistency.
FAQ
What is the Zener voltage tolerance of the 3EZ4.3D5RL?
The 3EZ4.3D5RL has a ±5% Zener voltage tolerance, with a guaranteed range of 4.09 V to 4.52 V at 4.5 mA test current (IZT). This tight binning ensures predictable regulation in feedback networks without external trimming, and is confirmed in the onsemi Electrical Characteristics table on page 3 of the datasheet.
Can the 3EZ4.3D5RL be used in surface-mount designs?
No-the 3EZ4.3D5RL is exclusively offered in the axial-leaded DO−41 (Case 59) package and is not available in SMD variants. Its mechanical outline and lead geometry require through-hole mounting; attempting SMT reflow will damage the device due to thermal mass mismatch and unsupported lead structure.
What is the maximum non-repetitive surge current the 3EZ4.3D5RL can withstand?
The 3EZ4.3D5RL supports a peak non-repetitive reverse surge current of 590 A at 25°C ambient, derived from its 98 W surge power rating at 1 ms pulse width. This value is explicitly listed in the Electrical Characteristics table on page 3 under "IR" for the 3EZ4.3D5 device entry.
How does the 3EZ4.3D5RL's thermal derating work above 75°C lead temperature?
Above TL = 75°C, the 3EZ4.3D5RL derates linearly at 24 mW/°C-reducing maximum allowable power dissipation by 24 mW for each degree Celsius increase. At TL = 100°C, for example, usable power drops to 2.4 W. This derating curve is plotted in Figure 1 of the onsemi datasheet and applies specifically to 3/8″ lead length.
Is the 3EZ4.3D5RL RoHS compliant and halogen-free?
Yes-the 3EZ4.3D5RL is available in Pb-free packaging meeting RoHS Directive 2011/65/EU requirements. The datasheet confirms "These devices are available in Pb−free package(s)" and specifies identical electrical and thermal specifications for both standard and Pb-free versions, with no halogen content restrictions noted in the materials declaration.
3EZ4.3D5RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 4.5 Ohms
- Current - Reverse Leakage @ Vr:
- 30 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
3EZ4.3D5RL FAQ
1.How can I place an order for 3EZ4.3D5RL through Aetrix?
Please submit a Request for Quotation (RFQ) for 3EZ4.3D5RL 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 3EZ4.3D5RL reliable?
The price and inventory of 3EZ4.3D5RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3EZ4.3D5RL is usually 5 days.
3.What payment methods are accepted for 3EZ4.3D5RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3EZ4.3D5RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3EZ4.3D5RL?
3EZ4.3D5RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3EZ4.3D5RL 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 3EZ4.3D5RL?
For technical support, including 3EZ4.3D5RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3EZ4.3D5RL requirements.
6.How does Aetrix verify that 3EZ4.3D5RL is sourced from the original manufacturer or authorized distributors?
All 3EZ4.3D5RL 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 3EZ4.3D5RL meets industry standards.
7.What is the process for return or replacement of 3EZ4.3D5RL?
All 3EZ4.3D5RL units undergo pre-shipment inspection (PSI). If there is an issue with 3EZ4.3D5RL, 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 3EZ4.3D5RL part is unused and in its original packaging.
Return procedure for 3EZ4.3D5RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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