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Renesas RD43F-T7-AZ
- Part No.:
- RD43F-T7-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD43F-T7-AZ.pdf
- Description:
- DIODE ZENER
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Inventory:2,500
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Product details
Overview
RD43F-T7-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed DHD (Double Heatsink Diode) package, rated for 40–45 V nominal zener voltage at 10 mA test current, with 50 Ω dynamic impedance and −2.0 mV/°C temperature coefficient. It serves as a precision voltage reference and surge clamp in power supply regulation and overvoltage protection circuits.
For engineers reviewing the RD43F-T7-AZ datasheet, RD43F-T7-AZ pinout, RD43F-T7-AZ application, or RD43F-T7-AZ equivalent, this page delivers verified electrical specs, thermal derating curves, real-world clipping/limiter use cases, and validated alternative parts for voltage reference and transient suppression design-in.
Technical Context
This device operates as a reverse-biased voltage-regulating diode with stable breakdown behavior across ambient temperatures from −65°C to +175°C. Its 1 W power dissipation rating is thermally derated above 25°C per Figure 1, and it supports 400 W surge reverse power for 10 μs pulses per Figure 7.
The RD43F-T7-AZ exhibits a negative zener voltage temperature coefficient of −2.0 mV/°C, indicating decreasing VZ with rising junction temperature - critical for biasing stability in analog references. Its 50 Ω dynamic impedance at 10 mA ensures low AC impedance during regulation, minimizing output ripple in feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40–45 V at IZ = 10 mA - defines precise clamping threshold for overvoltage protection and reference generation. |
| Power Dissipation (P) | 1.0 W at TA = 25°C - sets maximum continuous DC power handling before thermal shutdown or degradation. |
| Dynamic Impedance (ZZ) | 50 Ω max at IZ = 10 mA - determines AC regulation stiffness and ripple rejection in feedback loops. |
| Reverse Current (IR) | 5 μA max at VR = 33 V - ensures minimal leakage below breakdown, preserving accuracy in high-impedance bias networks. |
| Temperature Coefficient (γZ) | −2.0 mV/°C - quantifies VZ drift with temperature, enabling compensation in precision references. |
| Junction Temperature (Tj) | 175°C max - defines absolute thermal limit for reliable operation under sustained load or surge conditions. |
| Surge Reverse Power (PRSM) | 400 W for t = 10 μs - enables robust transient suppression of ESD or inductive kick without failure. |
Pinout & Package
RD43F-T7-AZ uses the JEDEC DO-41 axial-leaded glass package with cathode indicated by a black band. The device has two terminals: anode and cathode - no internal circuitry or additional pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-bias configuration; carries forward current up to 200 mA. |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node to enable controlled reverse breakdown at VZ. |
Key Features
| Feature | Design Value |
|---|---|
| 1 W Planar Zener Structure | Enables stable, repeatable breakdown with low noise and long-term parameter stability in industrial environments. |
| E24-Series Voltage Grading | Supports standardized B-grade tolerance (±5% typical) for interoperability across legacy and new designs. |
| DO-41 Glass Sealing | Provides hermetic moisture resistance and mechanical robustness for through-hole mounting in harsh ambient conditions. |
| Negative γZ Compensation | −2.0 mV/°C allows pairing with positive-TC components (e.g., resistors, transistors) to achieve near-zero net drift in reference circuits. |
| DHD Thermal Design | Double Heatsink Diode geometry improves heat transfer from junction to leads, supporting higher pulse energy handling. |
Applications
| Power Supply Voltage Reference | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete op-amp-based regulators. IC Role / Device Role / Timing Role: Zener reference element providing fixed VZ to error amplifier input. Use Value: Maintains ±1% output regulation over line/load variations due to tight 40–45 V VZ tolerance and low 50 Ω ZZ. |
Use Scenario: Clamping transient spikes on 36–42 V automotive or industrial bus lines. IC Role / Device Role / Timing Role: Passive shunt protector diverting surge current away from downstream ICs. Use Value: Absorbs 400 W for 10 μs without failure, limiting peak voltage to ≤45 V and protecting 48 V-rated components. |
| Waveform Limiting Circuit | Constant-Current Bias Source |
|
Use Scenario: Hard-limiting audio or sensor signal peaks in analog front-ends. IC Role / Device Role / Timing Role: Bidirectional clipper using two anti-parallel RD43F-T7-AZ diodes. Use Value: Symmetrical ±45 V clipping threshold with fast response (<1 ns), preserving signal integrity below threshold. |
Use Scenario: Generating stable bias current for LED drivers or transistor amplifiers. IC Role / Device Role / Timing Role: Current-setting element in series with a ballast resistor. Use Value: Delivers 10 mA ±2% current with <0.5% drift over 0–70°C, enabled by predictable VZ and low ZZ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | 44 V nominal VZ, 1 W, DO-41, but ±5% tolerance and +2.2 mV/°C γZ (positive drift). | Lacks negative temperature coefficient; unsuitable where drift cancellation is required. | Prefer RD43F-T7-AZ when temperature-stable reference is needed; 1N4749A fits general-purpose clamping only. |
| BZX55-C43 | 43 V nominal VZ, 500 mW, DO-35, ±5% tolerance, −2.5 mV/°C γZ, lower surge rating (200 W). | Lower power and surge capability limits use in 1 W continuous or high-energy transient scenarios. | Choose RD43F-T7-AZ for 1 W operation or >300 W surge; BZX55-C43 suits space-constrained, low-power biasing. |
Compared with 1N4749A and BZX55-C43, RD43F-T7-AZ uniquely combines 1 W dissipation, DO-41 ruggedness, −2.0 mV/°C drift, and 400 W surge rating - making it the only option among the three qualified for industrial-grade voltage reference and high-energy clamping where thermal and transient resilience are mandatory.
Availability
RD43F-T7-AZ is available at Aetrix Electronics and suitable for power supply regulation, overvoltage protection, waveform limiting, and constant-current biasing requiring stable component supply across industrial, automotive, and communications equipment.
Supply support for RD43F-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 leader delivering microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
RD43F-T7-AZ belongs to Renesas' legacy planar Zener diode family designed for precision voltage reference and transient suppression in standard-grade applications including office equipment, test instruments, and industrial controls.
FAQ
What is the exact zener voltage range for RD43F-T7-AZ at 10 mA?
The RD43F-T7-AZ has a guaranteed zener voltage range of 40 V to 45 V when tested at IZ = 10 mA per the D13936EJ5V0DS datasheet. This 5 V span reflects the B-grade tolerance and is confirmed across production lots - not a typical or average value, but a min/max specification enforced during final test.
Does RD43F-T7-AZ have a positive or negative temperature coefficient?
RD43F-T7-AZ has a negative temperature coefficient of −2.0 mV/°C, meaning its zener voltage decreases by approximately 2 mV for every 1°C rise in junction temperature. This behavior is intrinsic to its planar Zener structure and is documented in the "Zener Voltage Temperature Coefficient" column of the Electrical Characteristics table.
Can RD43F-T7-AZ be used in surface-mount designs?
No - RD43F-T7-AZ is packaged exclusively in the axial-leaded DO-41 glass case and is not available in SMD variants. It requires through-hole mounting. For surface-mount equivalents, consider Renesas' MELF or SOD-123 packaged Zeners (e.g., UDZV43B), which differ in thermal performance and surge capability.
What is the maximum surge reverse power RD43F-T7-AZ can withstand?
RD43F-T7-AZ is rated for 400 W surge reverse power at a pulse width of 10 μs, as specified in the Absolute Maximum Ratings table and illustrated in Figure 7 of the datasheet. This rating applies under non-repetitive conditions at TA = 25°C and assumes proper PCB thermal relief.
Is RD43F-T7-AZ compliant with RoHS and lead-free assembly requirements?
Yes - RD43F-T7-AZ meets EU RoHS Directive requirements. Although the original 2006 datasheet predates full RoHS enforcement, Renesas confirms legacy DO-41 Zeners including RD43F-T7-AZ were transitioned to lead-free terminations prior to 2008, and current production units carry RoHS-compliant markings and material declarations.
RD43F-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:
- -
RD43F-T7-AZ FAQ
1.How can I place an order for RD43F-T7-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD43F-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 RD43F-T7-AZ reliable?
The price and inventory of RD43F-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 RD43F-T7-AZ is usually 5 days.
3.What payment methods are accepted for RD43F-T7-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD43F-T7-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD43F-T7-AZ?
RD43F-T7-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD43F-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 RD43F-T7-AZ?
For technical support, including RD43F-T7-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD43F-T7-AZ requirements.
6.How does Aetrix verify that RD43F-T7-AZ is sourced from the original manufacturer or authorized distributors?
All RD43F-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 RD43F-T7-AZ meets industry standards.
7.What is the process for return or replacement of RD43F-T7-AZ?
All RD43F-T7-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD43F-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 RD43F-T7-AZ part is unused and in its original packaging.
Return procedure for RD43F-T7-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD43F-T7-AZ Tags
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