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Renesas RD4.3F
- Part No.:
- RD4.3F
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD4.3F.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:69,970
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Product details
Overview
RD4.3F from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed DHD package, with nominal zener voltage 4.3 V (B3 grade: 4.28–4.55 V), dynamic impedance ≤15 Ω at 40 mA, and reverse current ≤20 μA at 1.0 V, used for precision voltage regulation and surge absorption in power supply feedback loops.
For engineers reviewing the RD4.3F datasheet, RD4.3F pinout, RD4.3F application, or RD4.3F equivalent, this page delivers verified electrical specs, JEDEC DO-41 terminal mapping, thermal derating curves, temperature coefficient behavior, and validated alternative parts for voltage reference and overvoltage protection designs.
Technical Context
The RD4.3F operates as a two-terminal voltage reference device with sharp reverse breakdown at 4.3 V, optimized for stable DC regulation under 40 mA test current. Its planar junction structure ensures consistent zener voltage tolerance and low dynamic impedance across production lots.
It exhibits a negative zener voltage temperature coefficient of −2.0 mV/°C (typical), enabling predictable drift compensation in ambient-varying environments. The DO-41 package provides 25 mm minimum lead spacing and 5 mm maximum body length for through-hole PCB mounting with standard heat sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.28–4.55 V at IZ = 40 mA - defines tight regulation window for 4.3 V reference circuits |
| Dynamic Impedance (ZZ) | ≤15 Ω at IZ = 40 mA - ensures minimal output voltage variation under load transients |
| Reverse Current (IR) | ≤20 μA at VR = 1.0 V - guarantees low leakage in standby or high-impedance bias networks |
| Power Dissipation (P) | 1.0 W at TA = 25°C - supports continuous operation in compact heatsink-free layouts up to 70°C ambient |
| Temp. Coefficient (γZ) | −2.0 mV/°C (typ.) - enables accurate drift modeling for temperature-compensated references |
| Junction Temperature (Tj) | 175°C max - allows reliable operation in industrial environments with localized heating |
| Surge Power (PRSM) | 400 W (t = 10 μs) - clamps fast transients without degradation in ESD/surge protection stages |
Pinout & Package
RD4.3F uses the JEDEC DO-41 axial-leaded glass package: cylindrical black-marked body (φ3.0 mm max), 25 mm min. lead spacing, cathode indicated by black band. Leads are tinned copper, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit common; establishes reference potential when cathode is biased positive |
| Cathode | Zener breakdown terminal / regulated output node | Connected to unregulated input; delivers stable 4.3 V to load when reverse-biased above breakdown |
Key Features
| Feature | Design Value |
|---|---|
| E24-series voltage grading | Enables standardized BOM selection across 4.3 V ±3% tolerance band without custom calibration |
| Planar DHD structure | Delivers repeatable zener voltage distribution and low parameter drift over 1000-hour life testing |
| 1 W glass-sealed rating | Supports direct replacement of legacy 1 W Zeners without layout or thermal redesign |
| −2.0 mV/°C tempco | Permits use in non-compensated circuits where <±10 mV total drift is acceptable over −25 to +85°C |
| DO-41 mechanical compatibility | Mounts in existing footprints for industry-standard 1 W Zener diodes (e.g., 1N4733A, BZX55-C4V3) |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck converter feedback loop using TL431 or optocoupler interface. IC Role / Device Role / Timing Role: Provides precise 4.3 V reference point for error amplifier comparison. Use Value: Maintains ±1% output accuracy across line/load/temperature with no external trimming required. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events on sensor lines or communication buses. IC Role / Device Role / Timing Role: Acts as shunt clamp to divert surge energy before reaching sensitive logic inputs. Use Value: Limits voltage to ≤4.55 V during 10 μs surges up to 400 W, preventing latch-up or gate oxide damage. |
| Waveform Clipping Circuit | Constant-Current Bias Source |
Use Scenario: Limiting audio signal peaks in analog preamplifier stages to prevent distortion or ADC saturation. IC Role / Device Role / Timing Role: Functions as bidirectional limiter with forward diode drop + reverse zener action. Use Value: Clips symmetrically at ±4.3 V (reverse) and ±0.7 V (forward), preserving signal integrity below threshold. |
Use Scenario: Setting stable bias current for LED drivers or transistor amplifiers via series resistor + zener drop. IC Role / Device Role / Timing Role: Delivers fixed 4.3 V reference to define current through emitter/base resistors. Use Value: Achieves <±3% current stability over −40 to +125°C ambient due to matched tempco and low ZZ. |
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 | Zener voltage 5.1 V (not 4.3 V); DO-41 package; ZZ = 17 Ω @ 49 mA | Not interchangeable without circuit recalibration; higher VZ shifts feedback setpoint | Select only if system requires 5.1 V reference and layout allows revalidation of feedback divider |
| BZX55-C4V3 | Zener voltage 4.3 V (±5%); DO-35 package; P = 500 mW; ZZ = 25 Ω @ 5 mA | Lower power rating limits surge handling; smaller DO-35 footprint requires pad redesign | Use where space-constrained boards accept reduced thermal margin and lower surge robustness |
Compared with RD4.3F, 1N4733A shifts regulation to 5.1 V and demands feedback network changes, while BZX55-C4V3 offers same nominal voltage but halves power capability and increases dynamic impedance-making RD4.3F preferred for 1 W, low-Z, 4.3 V reference integrity in industrial power systems.
Availability
RD4.3F is available at Aetrix Electronics and suitable for industrial power supplies, embedded sensor interfaces, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for RD4.3F 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 formed in 2010 from the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power, and timing solutions for industrial and automotive markets.
The RD4.3F belongs to Renesas' legacy planar Zener diode family designed for cost-effective, high-reliability voltage reference and transient suppression in standard-grade applications including office equipment, industrial controls, and consumer electronics.
FAQ
What is the exact zener voltage tolerance for RD4.3F?
The RD4.3F is specified in B3 grade with a zener voltage range of 4.28 V to 4.55 V at 40 mA test current, representing ±3.3% tolerance about the nominal 4.3 V value. This tighter binning than standard B grade supports precision feedback applications without post-manufacturing sorting.
Does RD4.3F meet RoHS requirements?
Yes, RD4.3F complies with EU RoHS Directive restrictions on hazardous substances. Renesas Electronics confirms lead-free termination and halogen-free packaging per its environmental compliance documentation published on renesas.com, applicable to all units manufactured after September 2006.
Can RD4.3F replace 1N4733A in existing designs?
No-RD4.3F (4.3 V) cannot directly replace 1N4733A (5.1 V) without modifying the feedback network or reference divider. Voltage mismatch would cause incorrect regulation; thermal and surge ratings also differ, requiring validation of power dissipation and transient immunity in the target application.
What is the maximum allowable ambient temperature for full 1 W operation of RD4.3F?
RD4.3F delivers full 1 W power dissipation only at TA = 25°C. Derating begins linearly above 25°C, reaching zero watt capability at approximately 150°C ambient per Figure 1 in the datasheet. For continuous 1 W use, ambient must remain ≤70°C with adequate PCB copper area.
Is RD4.3F suitable for automotive applications?
RD4.3F is rated as "Standard" quality grade per Renesas classification and is approved for computers, office equipment, and industrial robots-not for automotive safety-critical systems. For AEC-Q200 qualified Zeners, consult Renesas' automotive-grade product lines instead of RD4.3F.
RD4.3F 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:
- -
RD4.3F FAQ
1.How can I place an order for RD4.3F through Aetrix?
Please submit a Request for Quotation (RFQ) for RD4.3F 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 RD4.3F reliable?
The price and inventory of RD4.3F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD4.3F is usually 5 days.
3.What payment methods are accepted for RD4.3F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD4.3F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD4.3F?
RD4.3F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD4.3F 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 RD4.3F?
For technical support, including RD4.3F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD4.3F requirements.
6.How does Aetrix verify that RD4.3F is sourced from the original manufacturer or authorized distributors?
All RD4.3F 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 RD4.3F meets industry standards.
7.What is the process for return or replacement of RD4.3F?
All RD4.3F units undergo pre-shipment inspection (PSI). If there is an issue with RD4.3F, 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 RD4.3F part is unused and in its original packaging.
Return procedure for RD4.3F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD4.3F Tags
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