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Renesas RD4.3F-T7-AZ
- Part No.:
- RD4.3F-T7-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD4.3F-T7-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:67,500
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Product details
Overview
RD4.3F-T7-AZ 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 2 V. It serves as a precision voltage reference and overvoltage clamp in power supply regulation circuits.
For engineers reviewing the RD4.3F-T7-AZ datasheet, RD4.3F-T7-AZ pinout, RD4.3F-T7-AZ application, or RD4.3F-T7-AZ equivalent, key selection criteria include its ±0.13 V tolerance band, −2.0 mV/°C temperature coefficient, 175°C maximum junction temperature, and suitability for surge absorption and waveform limiting in industrial control and consumer power rails.
Technical Context
This device operates in reverse-bias breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its planar DHD structure provides low thermal resistance and high reliability in continuous and transient power dissipation scenarios.
The RD4.3F-T7-AZ exhibits a typical zener voltage temperature coefficient of −2.0 mV/°C, indicating predictable negative drift with rising ambient temperature, and supports surge reverse power up to 400 W for 10 μs pulses - critical for ESD and transient suppression in unprotected input stages.
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 designs |
| Dynamic Impedance (ZZ) | ≤15 Ω - ensures minimal output voltage variation under load transients |
| Reverse Current (IR) | ≤20 μA at VR = 2 V - guarantees low leakage in standby or low-power monitoring circuits |
| Power Dissipation (P) | 1.0 W at TA = 25°C - sets thermal design baseline for PCB copper area and heatsinking |
| Junction Temperature (Tj) | −65 to +175°C - enables operation in extended industrial environments without derating below 125°C |
| Surge Reverse Power (PRSM) | 400 W (t = 10 μs) - provides robust protection against short-duration voltage spikes |
| Temperature Coefficient (γZ) | −2.0 mV/°C - allows accurate compensation in temperature-sensitive analog references |
Pinout & Package
RD4.3F-T7-AZ uses JEDEC DO-41 glass-sealed axial package with cathode indicated by black band. The device has two terminals: anode and cathode - no internal circuitry or active control pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-bias regulation; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node; maintains regulated voltage relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range (2–82 V) | Enables standardization across multiple power rail voltages using same family footprint and thermal profile |
| E24 series nominal values | Supports common industry-standard voltage points with predictable binning and inventory planning |
| Planar DHD structure | Delivers superior thermal performance vs. conventional axial diodes, reducing Rth(j-a) by up to 30% at S = 20 mm² |
| DO-41 mechanical compatibility | Ensures drop-in replacement capability with legacy 1 W zener diodes in existing through-hole layouts |
| B3-grade voltage tolerance | Provides tighter 0.27 V spread (±6.3%) than B-grade, improving accuracy in feedback loops without trimming |
Applications
| Power Supply Voltage Reference | ESD Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback node in linear regulator or switching converter error amplifier. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed bias point for op-amp comparator input. Use Value: Maintains ±1% output regulation over line/load variations due to 15 Ω dynamic impedance and low temperature drift. | Use Scenario: Protecting microcontroller GPIO pins from electrostatic discharge events. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor clamping fast-rising surges to safe levels. Use Value: Limits peak voltage to ≤5.5 V during 8 kV HBM events, preventing latch-up or gate oxide damage. |
| Waveform Limiting Circuit | Overvoltage Detection Threshold |
Use Scenario: Clipping audio signal peaks in analog front-end before ADC sampling. IC Role / Device Role / Timing Role: Passive limiter defining upper amplitude bound via reverse breakdown conduction. Use Value: Delivers sharp 4.3 V clipping threshold with <10 ns response time, preserving signal integrity below threshold. | Use Scenario: Triggering shutdown logic when 5 V rail exceeds safe operating margin. IC Role / Device Role / Timing Role: Precision threshold detector feeding comparator input with known reference voltage. Use Value: Enables reliable trip point at 4.35 V ±0.05 V, minimizing false triggers from supply ripple or noise. |
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 not applicable; correct match is 1N4731A (4.3 V), but with wider tolerance (4.08–4.52 V) and higher ZZ (20 Ω) | Less precise regulation in feedback loops requiring tight voltage stability | Acceptable where cost sensitivity outweighs 0.05 V tighter tolerance and 5 Ω lower ZZ of RD4.3F-T7-AZ |
| BZX55-C4V3 | 4.3 V nominal, ±5% tolerance (4.09–4.51 V), ZZ ≤ 90 Ω at 5 mA - significantly higher impedance and looser grading | Limited to non-critical biasing; unsuitable for low-noise reference or fast transient clamping | Only suitable for general-purpose voltage limiting where RD4.3F-T7-AZ's 15 Ω ZZ and B3-grade consistency are not required |
Compared with 1N4731A and BZX55-C4V3, RD4.3F-T7-AZ offers superior voltage accuracy (±0.13 V vs. ±0.22 V), lower dynamic impedance (15 Ω vs. ≥20 Ω), and guaranteed B3-grade binning - making it preferred for industrial power monitoring, precision analog sensing, and automotive body electronics where long-term stability matters.
Availability
RD4.3F-T7-AZ is available at Aetrix Electronics and suitable for industrial power supplies, consumer appliance control boards, and automotive body electronics requiring stable component supply with full traceability and lifecycle continuity.
Supply support for RD4.3F-T7-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 global semiconductor manufacturer formed in 2010 through merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power, and timing solutions.
The RD2.0F to RD82F series was designed for high-reliability voltage regulation and transient suppression in industrial, computing, and consumer equipment - emphasizing thermal robustness, tight voltage grading, and DO-41 interoperability.
FAQ
What is the exact zener voltage tolerance for RD4.3F-T7-AZ?
The RD4.3F-T7-AZ is specified as B3 grade, with a zener voltage range of 4.28 V to 4.55 V at test current IZ = 40 mA. This ±0.135 V tolerance (±3.1%) is tighter than standard B-grade devices and ensures consistent performance in precision reference applications. The RD4.3F-T7-AZ datasheet confirms this range under Note 3 on page 4 of Document No. D13936EJ5V0DS.
Does RD4.3F-T7-AZ support surge protection per IEC 61000-4-2?
Yes, RD4.3F-T7-AZ supports transient suppression with a surge reverse power rating of 400 W for 10 μs pulses (Figure 7), enabling effective clamping of ESD events up to ±8 kV contact discharge per IEC 61000-4-2 when used with appropriate series impedance. Its 175°C max junction temperature and low ZZ ensure reliable operation during repeated surges - a key capability confirmed in the Absolute Maximum Ratings table of the RD4.3F-T7-AZ datasheet.
What is the thermal resistance (Rth(j-a)) of RD4.3F-T7-AZ at different PCB copper areas?
RD4.3F-T7-AZ thermal resistance varies with printed foil area: 200°C/W at S = 5 mm², 120°C/W at S = 10 mm², and 80°C/W at S = 20 mm² (Figure 2). These values assume standard FR-4 board thickness and no additional heatsinking. For continuous 1 W operation, ≥10 mm² copper area is recommended to keep junction temperature within 175°C limit - data directly extracted from the RD4.3F-T7-AZ Typical Characteristics section.
Is RD4.3F-T7-AZ RoHS compliant and lead-free?
Yes, RD4.3F-T7-AZ complies with EU RoHS Directive requirements, as confirmed in Renesas' environmental compliance documentation referenced in Notice 10 of the datasheet. The device uses lead-free glass encapsulation and tin-plated leads, with full material declarations available upon request from Renesas Electronics sales offices - consistent with all Renesas standard-grade products released after 2006.
Can RD4.3F-T7-AZ be used in automotive applications?
RD4.3F-T7-AZ is rated as "Standard" quality grade per Renesas classification, intended for computers, office equipment, and industrial robots - not for automotive safety-critical systems. While it meets AEC-Q200 stress test recommendations for passive components in some cases, Renesas does not certify it for automotive use without explicit written consent. For automotive applications, consult Renesas' "High Quality" grade alternatives or confirm qualification status directly with their sales office before design-in.
RD4.3F-T7-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:
- -
RD4.3F-T7-AZ FAQ
1.How can I place an order for RD4.3F-T7-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD4.3F-T7-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 RD4.3F-T7-AZ reliable?
The price and inventory of RD4.3F-T7-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD4.3F-T7-AZ is usually 5 days.
3.What payment methods are accepted for RD4.3F-T7-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD4.3F-T7-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD4.3F-T7-AZ?
RD4.3F-T7-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD4.3F-T7-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 RD4.3F-T7-AZ?
For technical support, including RD4.3F-T7-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD4.3F-T7-AZ requirements.
6.How does Aetrix verify that RD4.3F-T7-AZ is sourced from the original manufacturer or authorized distributors?
All RD4.3F-T7-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 RD4.3F-T7-AZ meets industry standards.
7.What is the process for return or replacement of RD4.3F-T7-AZ?
All RD4.3F-T7-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD4.3F-T7-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 RD4.3F-T7-AZ part is unused and in its original packaging.
Return procedure for RD4.3F-T7-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD4.3F-T7-AZ Tags
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