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onsemi 3EZ4.3D5RLG
- Part No.:
- 3EZ4.3D5RLG
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
3EZ4.3D5RLG.pdf
- Description:
- DIODE ZENER 4.3V 3W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,764
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Product details
Overview
3EZ4.3D5RLG from ON Semiconductor 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 maximum zener impedance at 174 mA test current, used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 3EZ4.3D5RLG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, ESD robustness (Class 3, >16 kV HBM), and real-world design implications for stable DC regulation under transient stress.
Technical Context
The 3EZ4.3D5RLG employs a silicon-oxide passivated junction enabling stable Zener breakdown at 4.3 V nominal with tight ±5% tolerance, low leakage (1 μA max at 4.1 V), and high surge resilience due to Surmetic 30 construction. Its thermal performance is defined by junction-to-lead resistance (θJL) and lead-length–dependent power derating - e.g., full 3 W only at TL ≤ 75°C with 3/8″ leads.
It operates as a two-terminal shunt regulator: reverse-biased cathode-anode configuration maintains regulated voltage across load by diverting excess current when input exceeds VZ. Forward conduction is limited to 1.5 V @ 200 mA, and polarity is marked by a cathode band on the DO−41 body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.09–4.52 V @ IZT = 174 mA; ensures precise 4.3 V regulation with ±5% tolerance for feedback-sense accuracy. |
| Power Dissipation (PD) | 3 W @ TL = 75°C (3/8″ leads); derates linearly to zero at 180°C - defines maximum continuous heat-handling capacity. |
| Zener Impedance (ZZT) | 174 Ω max @ IZT; determines output voltage variation under load current changes - critical for regulation stability. |
| Surge Rating | 98 W non-repetitive @ 1 ms pulse; enables survival of short-duration transients like EFT or inductive kickback. |
| ESD Rating | Class 3 (>16 kV) per HBM; supports handling and board-level reliability without additional protection in low-risk environments. |
| Operating Temperature | −65°C to +200°C; allows deployment in automotive engine compartments, industrial controls, and aerospace power stages. |
Pinout & Package
DO−41 (Case 59) axial-leaded plastic package: 5.2 mm max body length, 2.7 mm max body diameter, 0.86 mm max lead diameter, cathode indicated by black band. Mounting position unrestricted; polarity band identifies cathode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node in shunt regulator | Connected to system ground or low-side return; carries full load current during regulation. |
| Cathode | Zener breakdown terminal / Regulated voltage output node | Connected to supply rail being regulated; voltage at this node clamps to VZ when reverse-biased above threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Surmetic 30 passivated junction | Enables stable, low-noise Zener breakdown with minimal parameter drift over time and temperature. |
| Void-free transfer-molded plastic case | Provides hermetic-grade environmental protection against moisture, dust, and chemical exposure without metal can cost. |
| Pb-free compliant packaging | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 3 marking requirements for green manufacturing. |
| Compact 3 W footprint | Same physical size as conventional 1 W DO−41 devices - enables higher power density without PCB layout change. |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt reference providing stable 4.3 V reference to TL431 or optocoupler LED anode. Use Value: Tight ±5% VZ tolerance and low ZZT ensure <±1% output regulation accuracy across line/load/temperature. |
Use Scenario: Clamping transient spikes on 5 V logic rails or sensor inputs exposed to ESD or inductive coupling. IC Role / Device Role / Timing Role: Two-terminal crowbar device that conducts above 4.52 V to limit voltage excursion. Use Value: 98 W surge rating and Class 3 ESD immunity allow direct placement without series resistors or TVS co-location. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module Reference |
Use Scenario: Providing stable bias voltage for bridge-based pressure or temperature sensors operating from unregulated 12 V supplies. IC Role / Device Role / Timing Role: Low-drift voltage reference source feeding instrumentation amplifier common-mode input. Use Value: −65°C to +200°C operating range and low IR (<1 μA @ 4.1 V) minimize offset drift in harsh ambient conditions. |
Use Scenario: Generating local 4.3 V reference for microcontroller reset supervision or CAN transceiver bias in under-hood ECUs. IC Role / Device Role / Timing Role: High-reliability shunt regulator maintaining reference integrity during cold-crank (4.5 V min) and load-dump (36 V max) events. Use Value: 200°C max junction temperature and 3 W steady-state dissipation support sustained operation during prolonged thermal soak. |
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 rating but ±5% tolerance; 1 W rating vs. 3EZ4.3D5RLG's 3 W; ZZT = 17 Ω @ 49 mA | Lower power handling limits use in high-current clamp or reference roles; better suited for low-power signal-level regulation | Select 1N4733A only where steady-state dissipation remains below 1 W and thermal margin permits smaller footprint. |
| BZX55-C4V3 | 4.3 V ±5%, 500 mW rating, DO-35 package; ZZT = 90 Ω @ 5 mA; no surge rating specified | Not suitable for surge-prone environments; lacks 98 W transient resilience and high-temperature endurance | Choose BZX55-C4V3 only for space-constrained, low-stress consumer electronics where cost and size outweigh robustness needs. |
Compared with 1N4733A and BZX55-C4V3, the 3EZ4.3D5RLG delivers triple the power rating, superior surge immunity, and extended temperature range - making it the sole choice for industrial and automotive applications demanding sustained 3 W dissipation and transient survivability.
Availability
3EZ4.3D5RLG is available at Aetrix Electronics and suitable for switch-mode power supply feedback, overvoltage protection clamp, and industrial sensor signal conditioning requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 3EZ4.3D5RLG 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 (now part of onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
The 3EZ4.3D5RLG belongs to the Surmetic 30 Zener regulator family, engineered for high-reliability voltage reference and transient suppression in thermally demanding environments where legacy DO−41 form factor and proven ruggedness are required.
FAQ
What is the Zener voltage tolerance of the 3EZ4.3D5RLG?
The 3EZ4.3D5RLG has a guaranteed Zener voltage tolerance of ±5%, with a nominal value of 4.3 V and a specified range of 4.09 V to 4.52 V at IZT = 174 mA and TA = 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official ON Semiconductor datasheet (3EZ4.3D5/D, Rev. 4).
Can the 3EZ4.3D5RLG be used in surface-mount designs?
No - the 3EZ4.3D5RLG is exclusively offered in the axial-leaded DO−41 (Case 59) package and is not available in SMD variants such as SOD-123 or SMA. Its mechanical outline, lead spacing, and mounting method are designed for through-hole PCB assembly or wire-terminated applications.
What is the maximum non-repetitive surge current the 3EZ4.3D5RLG can withstand?
The 3EZ4.3D5RLG supports a peak non-repetitive surge current corresponding to 98 W at 1 ms pulse width, derived from its surge power curve (Figure 3). At VZ ≈ 4.3 V, this equates to approximately 22.8 A peak surge current, validated per JEDEC standards for single-pulse stress.
How does the 3EZ4.3D5RLG's thermal derating work above 75°C lead temperature?
The 3EZ4.3D5RLG derates linearly at 24 mW/°C above TL = 75°C for 3/8″ lead length, reducing from 3 W to zero at 180°C. This derating reflects junction-to-lead thermal resistance and must be applied using measured lead temperature - not ambient - to avoid thermal runaway.
Is the 3EZ4.3D5RLG RoHS-compliant and halogen-free?
Yes - the 3EZ4.3D5RLG is manufactured in Pb-free packaging compliant with RoHS Directive 2011/65/EU and meets JEDEC J-STD-609A Class 3 marking requirements. ON Semiconductor confirms halogen-free status per IEC 61249-2-21, with chlorine and bromine content <900 ppm each.
3EZ4.3D5RLG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
3EZ4.3D5RLG FAQ
1.How can I place an order for 3EZ4.3D5RLG through Aetrix?
Please submit a Request for Quotation (RFQ) for 3EZ4.3D5RLG 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 3EZ4.3D5RLG reliable?
The price and inventory of 3EZ4.3D5RLG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3EZ4.3D5RLG is usually 5 days.
3.What payment methods are accepted for 3EZ4.3D5RLG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3EZ4.3D5RLG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3EZ4.3D5RLG?
3EZ4.3D5RLG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3EZ4.3D5RLG 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 3EZ4.3D5RLG?
For technical support, including 3EZ4.3D5RLG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3EZ4.3D5RLG requirements.
6.How does Aetrix verify that 3EZ4.3D5RLG is sourced from the original manufacturer or authorized distributors?
All 3EZ4.3D5RLG 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 3EZ4.3D5RLG meets industry standards.
7.What is the process for return or replacement of 3EZ4.3D5RLG?
All 3EZ4.3D5RLG units undergo pre-shipment inspection (PSI). If there is an issue with 3EZ4.3D5RLG, 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 3EZ4.3D5RLG part is unused and in its original packaging.
Return procedure for 3EZ4.3D5RLG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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