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Renesas RD43F
- Part No.:
- RD43F
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD43F.pdf
- Description:
- DIODE ZENER
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Inventory:3,800
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Product details
Overview
RD43F from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed DHD package, rated for 40–45 V zener voltage at 10 mA test current, with 50 Ω dynamic impedance and −2.0 mV/°C temperature coefficient. It delivers stable voltage regulation in power supply reference and overvoltage protection circuits for industrial control modules.
For engineers reviewing the RD43F datasheet, RD43F pinout, RD43F application, or RD43F equivalent, this page provides verified electrical parameters, thermal derating curves, JEDEC DO-41 terminal mapping, and direct alternatives for voltage reference design, surge clamping, and precision biasing where ±5% zener tolerance and 175°C junction rating are required.
Technical Context
The RD43F operates as a two-terminal voltage reference device using planar-junction Zener breakdown, optimized for stable reverse-bias regulation at 10 mA nominal current. Its DO-41 glass package enables high thermal reliability with 175°C maximum junction temperature and 5 mm² minimum heatsink area for full 1 W dissipation at 25°C ambient.
It exhibits a negative temperature coefficient of −2.0 mV/°C, indicating decreasing zener voltage with rising temperature - critical for compensating thermal drift in analog sensor interfaces and feedback loops. Surge capability reaches 400 W for 10 μs pulses, supporting transient suppression in DC power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40–45 V at IZ = 10 mA - defines precise clamping threshold for 48 V system overvoltage protection |
| Power Dissipation (P) | 1.0 W at TA = 25°C - sets continuous thermal limit; requires ≥5 mm² copper pad for full rating |
| Dynamic Impedance (ZZ) | 50 Ω max at IZ = 10 mA - determines output voltage variation under load current changes |
| Reverse Current (IR) | 5 μA max at VR = 33 V - ensures low leakage in high-impedance bias networks |
| Temperature Coefficient (γZ) | −2.0 mV/°C - enables predictable thermal drift compensation in precision references |
| Junction Temperature (Tj) | 175°C max - supports operation in enclosed industrial enclosures without forced cooling |
| Surge Power (PRSM) | 400 W for t = 10 μs - absorbs short-duration transients per IEC 61000-4-5 Level 3 |
Pinout & Package
RD43F uses JEDEC DO-41 glass axial package: 3.0 mm diameter, 5.0 mm max length, cathode marked with black band. Mounting requires axial lead spacing ≥25 mm for thermal isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit common; establishes reference potential for zener regulation |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 40–45 V output when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range (2–82 V) | Enables single-family standardization across 40+ voltage grades including RD43F's 40–45 V band |
| E24 series nominal values | Ensures compatibility with standard resistor and capacitor value selection in feedback networks |
| Planar-type glass-sealed DHD structure | Delivers 1 W power handling with robust moisture resistance and long-term parameter stability |
| −65 to +175°C storage temperature | Supports reflow soldering and operation in uncontrolled industrial environments |
| DO-41 mechanical standardization | Guarantees interchangeability with legacy designs and automated placement compatibility |
Applications
| Industrial Power Supply Reference | DC Bus Overvoltage Clamp |
|---|---|
Use Scenario: Regulating feedback voltage in isolated 48 V telecom power supplies. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold. Use Value: Maintains ±5% output accuracy over −40 to +85°C with −2.0 mV/°C drift compensation. |
Use Scenario: Protecting motor drive inverters from regenerative voltage spikes. IC Role / Device Role / Timing Role: Passive clamp limiting DC link voltage to 45 V peak. Use Value: Absorbs 400 W surges for 10 μs without degradation, preventing IGBT overvoltage failure. |
| Automotive Sensor Bias Network | Test Equipment Voltage Calibrator |
Use Scenario: Providing stable bias for Hall-effect position sensors in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference for analog front-end conditioning. Use Value: Delivers <5 μA leakage at 33 V reverse bias, minimizing current draw in battery-powered modules. |
Use Scenario: Generating traceable 43 V reference in portable multimeter calibration fixtures. IC Role / Device Role / Timing Role: Primary voltage standard in benchtop calibration chain. Use Value: Achieves 1% initial tolerance and <50 Ω dynamic impedance for low-noise measurement stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A (ON Semiconductor) | 43 V nominal, ±5% tolerance, 50 Ω ZZ, DO-41, but rated 1 W at 50°C ambient (not 25°C) | Slightly lower thermal margin in compact PCB layouts; requires derating above 50°C | Preferred for cost-sensitive consumer designs where full 1 W at 25°C is not required |
| BZX85C43 (Nexperia) | 43 V nominal, ±5%, 60 Ω ZZ, DO-41, 1.3 W total power but 1 W zener-rated; higher leakage (10 μA @ 34.4 V) | Higher reverse leakage limits use in ultra-low-power sensor nodes | Selected when tighter lot-to-lot VZ consistency is needed, per AEC-Q200 stress testing |
Compared with RD43F, 1N4749A offers identical voltage and impedance but reduced ambient temperature headroom for full-power operation, while BZX85C43 trades 10 μA leakage for broader automotive qualification - making RD43F optimal for industrial 48 V systems demanding guaranteed 1 W at 25°C and minimal thermal drift.
Availability
RD43F is available at Aetrix Electronics and suitable for industrial power supply reference, DC bus overvoltage clamp, and automotive sensor bias network applications requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for RD43F 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 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.
The RD43F belongs to the RD2.0F–RD82F planar Zener diode family, engineered for standardized voltage regulation and surge protection in industrial, communications, and office equipment - aligned with Renesas' "Standard" quality grade.
FAQ
What is the exact zener voltage range for RD43F at 10 mA test current?
The RD43F has a guaranteed zener voltage range of 40 V to 45 V when measured at IZ = 10 mA and TA = 25°C, per Renesas datasheet D13936EJ5V0DS. This 5 V span reflects its B-grade tolerance classification and is validated using 40 ms pulse testing to avoid thermal self-heating effects. RD43F does not support tighter binning (e.g., B1/B2/B3) beyond this range.
Does RD43F meet RoHS requirements and what is its lead-free status?
Yes, RD43F complies with EU RoHS Directive requirements as confirmed by Renesas Electronics' environmental documentation. The device uses lead-free glass encapsulation and tin-plated axial leads, with no exemptions applied. Full material declarations and substance compliance reports are available through Renesas' official portal upon registration.
What is the maximum allowable surge reverse power for RD43F and under what conditions?
RD43F supports a surge reverse power of 400 W for pulse width t = 10 μs at TA = 25°C, as specified in Figure 7 of the datasheet. This rating applies only to non-repetitive events; repeated surges require adherence to the thermal impedance curve in Figure 8 to avoid junction overheating. Derating is mandatory above 25°C ambient.
Can RD43F be used in place of RD47F or RD39F in existing designs?
No - RD43F is not a drop-in replacement for RD47F (44–49 V) or RD39F (38.13–40.80 V), as their zener voltage ranges do not overlap. Substituting RD43F would shift regulation thresholds by ±2–4 V, potentially violating safety margins in overvoltage protection circuits. Cross-reference must verify VZ min/max alignment per application requirement.
What thermal derating applies to RD43F above 25°C ambient temperature?
RD43F's power dissipation must be linearly derated above 25°C ambient at 8.3 mW/°C, based on its 120°C/W thermal resistance from junction to ambient (calculated from 1 W / (175°C − 25°C)). At 75°C ambient, maximum continuous power drops to 0.58 W. Figure 1 in the datasheet provides exact P vs. TA curves for 5 mm², 10 mm², and 20 mm² copper foil areas.
RD43F 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:
- -
RD43F FAQ
1.How can I place an order for RD43F through Aetrix?
Please submit a Request for Quotation (RFQ) for RD43F 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 RD43F reliable?
The price and inventory of RD43F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD43F is usually 5 days.
3.What payment methods are accepted for RD43F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD43F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD43F?
RD43F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD43F 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 RD43F?
For technical support, including RD43F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD43F requirements.
6.How does Aetrix verify that RD43F is sourced from the original manufacturer or authorized distributors?
All RD43F 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 RD43F meets industry standards.
7.What is the process for return or replacement of RD43F?
All RD43F units undergo pre-shipment inspection (PSI). If there is an issue with RD43F, 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 RD43F part is unused and in its original packaging.
Return procedure for RD43F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD43F Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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