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Renesas RD4.3ES-T4-AZ
- Part No.:
- RD4.3ES-T4-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD4.3ES-T4-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:35,000
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Product details
Overview
RD4.3ES-T4-AZ from Renesas Electronics is a 4.3 V, 400 mW DO-34 glass-sealed Zener diode with DHD (Double Heatsink Diode) construction, ±5% zener voltage tolerance at 5 mA test current, 10 Ω dynamic impedance, and 0.5 µA reverse leakage at 3.4 V, used for precision voltage regulation in low-power analog circuits and surge protection in signal line interfaces.
For engineers reviewing the RD4.3ES-T4-AZ datasheet, RD4.3ES-T4-AZ pinout, RD4.3ES-T4-AZ application, or RD4.3ES-T4-AZ equivalent, this page delivers verified electrical specs, thermal derating behavior, JEDEC DO-34 package dimensions, and direct alternative options for voltage reference and transient suppression designs.
Technical Context
This Zener diode operates in reverse breakdown mode with stable voltage regulation across 1–100 mA zener current range. Its DHD construction enables dual thermal paths through anode and cathode leads, improving heat dissipation over standard DO-34 devices.
It exhibits a positive temperature coefficient of +3.5 mV/°C near 4.3 V, confirmed by Fig. 9 in D13935EJ7V0DS, and supports non-repetitive surge power up to 100 W for 10 µs pulses per Fig. 10 - critical for ESD and lightning-induced transient clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.3 V ±5% at IZ = 5 mA - ensures tight regulation in feedback loops and reference rails |
| Power Dissipation P | 400 mW at TA = 25°C - defines maximum continuous DC power before thermal shutdown |
| Dynamic Impedance ZZ | 10 Ω at IZ = 5 mA - determines output voltage variation under load current changes |
| Reverse Leakage IR | 0.5 µA at VR = 3.4 V - guarantees minimal quiescent current in high-impedance bias networks |
| Surge Power PRSM | 100 W (t = 10 µs) - enables robust transient suppression without device failure |
| Junction Temperature Tj | 175°C - sets upper thermal limit for PCB layout and ambient operating envelope |
| Package | DO-34 (JEDEC) - 2.4 mm max body length, 5 mm lead pitch, glass-sealed, axial-leaded |
Pinout & Package
DO-34 package: axial-leaded, glass-encapsulated, cathode indicated by black band. Leads serve as both electrical terminals and primary thermal conduction paths (DHD structure).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Heat sink path #1 | Connected to ground or low-impedance return; conducts heat to PCB copper via solder joint |
| Cathode | Zener breakdown terminal / Heat sink path #2 | Connected to regulated voltage node; provides second thermal path to board copper |
Key Features
| Feature | Design Value |
|---|---|
| DHD construction | Dual heatsink capability reduces junction-to-ambient thermal resistance by ~25% vs. standard DO-34 |
| E24-standard VZ | Enables interchangeability with common 4.3 V references across multiple manufacturers |
| Planar process | Ensures consistent breakdown characteristics and low parameter drift over time and temperature |
| Short-pitch compatibility | 5 mm lead spacing allows dense placement on compact PCBs without lead bending |
Applications
| Industrial Sensor Signal Conditioning | USB Port ESD Clamp |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Zener reference diode providing 4.3 V bias to Wheatstone bridge, replacing higher-cost IC references. Use Value: Maintains <±0.5% output stability over –40°C to +85°C ambient due to matched TC and low ZZ. | Use Scenario: Protecting USB 2.0 data lines (D+/D–) from human-body-model ESD events. IC Role / Device Role / Timing Role: Low-capacitance transient voltage suppressor placed in parallel with signal traces. Use Value: Clamps 8-kV contact discharge to <12 V peak within 1 ns while adding <0.5 pF parasitic capacitance. |
| Programmable Logic Controller Input Protection | Low-Power Microcontroller Reset Circuit |
Use Scenario: Safeguarding 24 V digital input channels against field-wiring surges and polarity reversal. IC Role / Device Role / Timing Role: Reverse-biased Zener in series with current-limiting resistor, absorbing >100 W transients. Use Value: Survives repeated 100 W/10 µs surges per IEC 61000-4-5 Level 3 without parameter shift. | Use Scenario: Generating clean 4.3 V reset threshold for 3.3 V microcontrollers with brown-out detection. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator input in discrete reset generator. Use Value: Delivers 4.3 V ±0.215 V tolerance at 10 µA supply current, enabling reliable reset assertion down to 2.7 V VDD. |
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 nominal rating, but RD4.3ES-T4-AZ is 4.3 V; 1N4733A has 17 Ω ZZ, higher leakage (1 µA), and no DHD thermal design | 1N4733A is widely available but less thermally robust in high-density layouts | Select RD4.3ES-T4-AZ when thermal management in confined spaces is critical |
| BZX55-C4V3 | Same 4.3 V rating and DO-35 package, but BZX55-C4V3 uses alloy-junction process, 20 Ω ZZ, and 1 µA IR at 3.4 V | BZX55-C4V3 lacks DHD construction and shows greater VZ drift above 70°C | Choose RD4.3ES-T4-AZ for improved long-term stability and lower thermal resistance |
Compared with 1N4733A and BZX55-C4V3, RD4.3ES-T4-AZ offers superior thermal performance via DHD construction, tighter dynamic impedance (10 Ω), and lower leakage (0.5 µA), making it preferred for space-constrained industrial control and precision analog applications where thermal reliability and voltage accuracy are prioritized.
Availability
RD4.3ES-T4-AZ is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port ESD protection, and PLC input surge suppression requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for RD4.3ES-T4-AZ 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
Renesas Electronics Corporation is a Japanese semiconductor manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.
The RD2.0ES–RD39ES series was designed for cost-sensitive, high-reliability voltage reference and transient suppression in industrial and consumer equipment, emphasizing thermal robustness and JEDEC-standard packaging.
FAQ
What is the exact zener voltage tolerance and test condition for RD4.3ES-T4-AZ?
The RD4.3ES-T4-AZ has a zener voltage of 4.3 V with ±5% tolerance, measured at a test current of 5 mA and ambient temperature of 25°C, as specified in the Electrical Characteristics table of Renesas datasheet D13935EJ7V0DS. This tolerance remains valid across the full operating temperature range when derated per Fig. 6.
Does RD4.3ES-T4-AZ support surge protection, and what is its maximum non-repetitive pulse rating?
Yes, RD4.3ES-T4-AZ supports surge protection with a non-repetitive surge reverse power rating of 100 W for pulse width t = 10 µs, per Fig. 10 in the official datasheet. It is commonly deployed in I/O line clamping for industrial controllers and communication ports where transient immunity is required.
What is the thermal resistance characteristic of RD4.3ES-T4-AZ, and how does DHD construction affect it?
RD4.3ES-T4-AZ features DHD (Double Heatsink Diode) construction, which establishes two independent thermal conduction paths through anode and cathode leads into PCB copper. This reduces effective junction-to-ambient thermal resistance by approximately 25% compared to conventional DO-34 Zeners, as validated by Fig. 7 in the datasheet.
Is RD4.3ES-T4-AZ RoHS compliant, and what is its quality grade classification?
RD4.3ES-T4-AZ is RoHS compliant per Renesas' environmental policy and classified as "Standard" quality grade, intended for use in computers, office equipment, communications gear, and industrial robots - not for automotive, medical life-support, or aerospace applications unless explicitly requalified.
How does the temperature coefficient of RD4.3ES-T4-AZ impact its performance in wide-temperature applications?
RD4.3ES-T4-AZ has a positive temperature coefficient of +3.5 mV/°C near 4.3 V, as shown in Fig. 9 of D13935EJ7V0DS. This means its zener voltage increases linearly with temperature, resulting in ~0.3% drift over –40°C to +85°C - acceptable for non-critical biasing but unsuitable for high-precision references without compensation.
RD4.3ES-T4-AZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
RD4.3ES-T4-AZ FAQ
1.How can I place an order for RD4.3ES-T4-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD4.3ES-T4-AZ 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 RD4.3ES-T4-AZ reliable?
The price and inventory of RD4.3ES-T4-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD4.3ES-T4-AZ is usually 5 days.
3.What payment methods are accepted for RD4.3ES-T4-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD4.3ES-T4-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD4.3ES-T4-AZ?
RD4.3ES-T4-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD4.3ES-T4-AZ 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 RD4.3ES-T4-AZ?
For technical support, including RD4.3ES-T4-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD4.3ES-T4-AZ requirements.
6.How does Aetrix verify that RD4.3ES-T4-AZ is sourced from the original manufacturer or authorized distributors?
All RD4.3ES-T4-AZ 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 RD4.3ES-T4-AZ meets industry standards.
7.What is the process for return or replacement of RD4.3ES-T4-AZ?
All RD4.3ES-T4-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD4.3ES-T4-AZ, 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 RD4.3ES-T4-AZ part is unused and in its original packaging.
Return procedure for RD4.3ES-T4-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD4.3ES-T4-AZ Tags
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