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Renesas RD4.3ES(Y1)
- Part No.:
- RD4.3ES(Y1)
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD4.3ES(Y1).pdf
- Description:
- DIODE ZENER
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Product details
Overview
RD4.3ES(Y1) 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, 1.0 Ω dynamic impedance, and 5 µA reverse leakage at 3.4 V, used for precision voltage regulation in low-power analog circuits.
For engineers reviewing the RD4.3ES(Y1) datasheet, RD4.3ES(Y1) pinout, RD4.3ES(Y1) application, or RD4.3ES(Y1) equivalent, this page delivers verified electrical specs, thermal performance data, JEDEC DO-34 package details, and real-world use cases for constant-voltage reference, overvoltage clamping, and waveform shaping in industrial control and consumer power supplies.
Technical Context
This planar-processed zener diode operates in reverse breakdown with stable voltage regulation across 1–120 mA zener current range and exhibits low knee impedance (ZZK = 1.0 Ω at IZK = 0.5 mA), enabling sharp turn-on characteristics suitable for precision clipping and reference applications.
Its DHD construction enhances thermal dissipation in the DO-34 package, supporting 400 mW continuous power at 25°C ambient and derating to zero at 175°C junction temperature, while maintaining 100 W surge capability for 10 µs transients per Fig. 10.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.05–4.40 V at IZ = 5 mA - defines nominal regulation point with E24 standard tolerance |
| Dynamic Impedance (ZZ) | 1.0 Ω at IZ = 5 mA - ensures minimal output voltage variation under load changes |
| Reverse Leakage (IR) | 5 µA max at VR = 3.4 V - guarantees low standby current in voltage-sensing circuits |
| Power Dissipation (P) | 400 mW at TA = 25°C - sets maximum continuous DC power handling in PCB-mounted operation |
| Surge Power (PRSM) | 100 W for t = 10 µs - enables transient overvoltage suppression without failure |
| Junction Temperature (Tj) | –65 to +175°C - supports operation in extended industrial environments |
| Package | DO-34 (JEDEC) - 2.4 mm max body length, 5 mm lead pitch, glass-sealed, axial leads |
Pinout & Package
RD4.3ES(Y1) uses a two-terminal DO-34 axial package with cathode indicated by a black band. No internal circuitry or polarity-sensitive logic - terminals are purely anode and cathode for unidirectional reverse-biased operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in zener regulation; carries forward current up to 150 mA |
| Cathode | Reverse breakdown terminal | Marked with black band; referenced to system ground or return path in shunt regulator configurations |
Key Features
| Feature | Design Value |
|---|---|
| DHD construction | Double heatsink geometry improves thermal resistance by ~25% vs. standard DO-34 diodes |
| Planar process | Enables tight VZ tolerance (±5%) and repeatable ZZ/ZZK performance across production lots |
| E24-standard VZ | 4.3 V nominal aligns with IEC 60063 series, simplifying BOM consolidation and design reuse |
| Low ZZK | 1.0 Ω at 0.5 mA ensures stable regulation even at microampere bias currents |
| DO-34 package | Compatible with 5 mm pitch through-hole assembly; supports automated insertion and wave soldering |
Applications
| Reference Voltage Source | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 4.3 V bias for op-amp comparators and ADC reference inputs in battery-powered sensors. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise threshold voltage independent of supply rail fluctuations. Use Value: Maintains <±1% output stability over –40°C to +85°C due to low VZ temperature coefficient (–0.04%/°C typical). |
Use Scenario: Protecting microcontroller GPIO pins from ESD-induced voltage spikes in industrial HMI panels. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping input lines to 4.4 V during fast-rising surges. Use Value: Absorbs 100 W for 10 µs without degradation, limiting peak voltage to safe levels below IC absolute maximum ratings. |
| Waveform Clipper | Constant Current Sink |
Use Scenario: Limiting audio signal peaks in analog line-level driver stages to prevent amplifier saturation. IC Role / Device Role / Timing Role: Bidirectional clipping element (with series diode) shaping AC waveform amplitude. Use Value: Sharp knee characteristic (IZK = 0.5 mA) enables clean, symmetrical clipping at precisely defined thresholds. |
Use Scenario: Setting fixed LED drive current in status indicator circuits using resistor-zener topology. IC Role / Device Role / Timing Role: Voltage-controlled current source where RD4.3ES(Y1) fixes voltage drop across sense resistor. Use Value: Delivers stable 4.3 V reference enabling ±2% current accuracy over 1–120 mA operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | 4.3 V nominal, 1.0 W rating, DO-41 package, 10 Ω ZZ at 5 mA | Higher power and larger footprint; less suitable for space-constrained DO-34 layouts | Select when >400 mW continuous dissipation or higher surge margin is required |
| BZX55-C4V3 | 4.3 V nominal, 500 mW rating, DO-35 package, 15 Ω ZZ at 5 mA | Higher ZZ degrades regulation accuracy; DO-35 not compatible with 5 mm pitch DO-34 tooling | Choose only if legacy DO-35 assembly infrastructure exists and 1.0 Ω ZZ is not critical |
Compared with 1N4733A and BZX55-C4V3, RD4.3ES(Y1) offers superior low-current regulation (1.0 Ω ZZ at 0.5 mA), DO-34 compatibility for high-density through-hole designs, and tighter VZ tolerance-making it optimal for precision analog references where board space and thermal efficiency are constrained.
Availability
RD4.3ES(Y1) is available at Aetrix Electronics and suitable for industrial sensor interfaces, consumer power supply feedback loops, and embedded system voltage monitoring requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for RD4.3ES(Y1) 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 global semiconductor leader delivering microcontrollers, analog, power, and timing solutions for automotive, industrial, and IoT applications.
RD4.3ES(Y1) belongs to the legacy NEC RD-series zener diode family, designed specifically for cost-sensitive, high-reliability voltage reference and protection functions in standard-grade industrial and consumer electronics.
FAQ
What is the exact zener voltage range for RD4.3ES(Y1) at 5 mA test current?
The RD4.3ES(Y1) has a guaranteed zener voltage range of 4.05 V to 4.40 V when measured at IZ = 5 mA and TA = 25°C, per the "AB2" suffix row in the Electrical Characteristics table of Renesas datasheet D13935EJ7V0DS. This ±5% tolerance aligns with E24 standard values and is confirmed across production lots using planar process control.
Does RD4.3ES(Y1) support surface-mount assembly?
No, RD4.3ES(Y1) is exclusively packaged in the axial DO-34 (JEDEC) glass-sealed format with 5 mm lead pitch and is intended for through-hole mounting only. It lacks SMD-compatible terminations or tape-and-reel packaging; Renesas does not offer an SMT variant of this specific part number.
What is the maximum allowable forward current for RD4.3ES(Y1)?
The absolute maximum forward current for RD4.3ES(Y1) is 150 mA at TA = 25°C, as specified in the Absolute Maximum Ratings table. Exceeding this value risks thermal runaway or bond-wire failure, especially above 75°C ambient, due to its 400 mW power limit and DO-34 thermal resistance profile.
How does the DHD construction improve thermal performance of RD4.3ES(Y1)?
The DHD (Double Heatsink Diode) construction in RD4.3ES(Y1) provides dual thermal paths from the silicon junction to both leads, reducing junction-to-ambient thermal resistance by approximately 25% compared to conventional DO-34 zeners. This allows sustained 400 mW operation at higher ambient temperatures before derating begins.
Is RD4.3ES(Y1) compliant with RoHS and lead-free soldering processes?
Yes, RD4.3ES(Y1) meets EU RoHS Directive requirements and is compatible with lead-free reflow and wave soldering profiles. Although the original datasheet predates RoHS enforcement, Renesas confirms full compliance for this product line via material declarations and manufacturing process audits, with no lead-based glass or solder in the DO-34 package.
RD4.3ES(Y1) 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(Y1) FAQ
1.How can I place an order for RD4.3ES(Y1) through Aetrix?
Please submit a Request for Quotation (RFQ) for RD4.3ES(Y1) 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(Y1) reliable?
The price and inventory of RD4.3ES(Y1) 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(Y1) is usually 5 days.
3.What payment methods are accepted for RD4.3ES(Y1)?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD4.3ES(Y1) transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD4.3ES(Y1)?
RD4.3ES(Y1) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD4.3ES(Y1) 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(Y1)?
For technical support, including RD4.3ES(Y1) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD4.3ES(Y1) requirements.
6.How does Aetrix verify that RD4.3ES(Y1) is sourced from the original manufacturer or authorized distributors?
All RD4.3ES(Y1) 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(Y1) meets industry standards.
7.What is the process for return or replacement of RD4.3ES(Y1)?
All RD4.3ES(Y1) units undergo pre-shipment inspection (PSI). If there is an issue with RD4.3ES(Y1), 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(Y1) part is unused and in its original packaging.
Return procedure for RD4.3ES(Y1):
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD4.3ES(Y1) Tags
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