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Renesas RD43F-T8-AZ
- Part No.:
- RD43F-T8-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD43F-T8-AZ.pdf
- Description:
- DIODE ZENER
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Inventory:5,000
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Product details
Overview
RD43F-T8-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode with a nominal zener voltage of 43 V (B grade, 40–45 V range), dynamic impedance of 50 Ω at 10 mA, and reverse current ≤5 μA at 33 V. It features a DO-41 glass-sealed DHD package, −2.0 mV/°C temperature coefficient, and is rated for surge reverse power of 400 W (10 μs pulse). It is used in precision voltage reference and overvoltage protection circuits in industrial power supplies.
For engineers reviewing the RD43F-T8-AZ datasheet, RD43F-T8-AZ pinout, RD43F-T8-AZ application, or RD43F-T8-AZ equivalent, this page delivers verified electrical specs, thermal behavior, JEDEC DO-41 terminal mapping, real-world use cases in clamping and regulation, and two validated alternative Zener diodes with voltage and impedance trade-offs.
Technical Context
This device operates as a two-terminal voltage-reference component relying on controlled avalanche breakdown in its planar p-n junction. Its 1 W continuous power rating is derated above 25°C per Figure 1's P vs. TA curve, and thermal resistance depends on PCB copper area (e.g., 200°C/W at 5 mm² foil). The B-grade tolerance (±5.8% at 43 V) reflects a composite of tighter B1–B3 subgrades.
Dynamic impedance of 50 Ω at 10 mA defines its small-signal AC regulation stiffness, while the −2.0 mV/°C temperature coefficient indicates moderate negative drift-critical for stable biasing across −65°C to +175°C storage and up to +175°C junction operation. Surge capability (400 W, 10 μs) supports transient suppression without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40–45 V (B grade); sets precise DC reference or clamp threshold in feedback or protection paths. |
| Power Dissipation (P) | 1.0 W at TA = 25°C; requires thermal design (e.g., ≥20 mm² copper) for >75°C ambient. |
| Dynamic Impedance (ZZ) | 50 Ω at IZ = 10 mA; determines output voltage variation under load current changes. |
| Reverse Current (IR) | ≤5 μA at VR = 33 V; ensures low leakage in high-impedance sensing or standby circuits. |
| Temp. Coefficient (γZ) | −2.0 mV/°C; enables predictable drift compensation in temperature-sensitive references. |
| Surge Power (PRSM) | 400 W (t = 10 μs); absorbs short ESD or inductive kick events without failure. |
| Junction Temp. (Tj) | 175°C max; constrains maximum allowable power under thermal constraints. |
Pinout & Package
RD43F-T8-AZ uses a DO-41 glass-sealed axial package (JEDEC standard), with cathode identified 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 side in reverse-biased operation; carries forward current up to 200 mA. |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher potential side during regulation; sustains 43 V reverse bias. |
Key Features
| Feature | Design Value |
|---|---|
| Planar DHD structure | Enables stable 1 W power handling and repeatable breakdown via double heatsink geometry. |
| E24 voltage series | Supports standardized BOMs with 43 V fitting common industrial supply rails (e.g., 48 V systems). |
| DO-41 package compatibility | Ensures drop-in replacement in legacy through-hole designs using industry-standard footprint. |
| −65°C to +175°C operating range | Validates use in extended-temperature environments like motor drives and outdoor power electronics. |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converters for PLC I/O modules. IC Role / Device Role / Timing Role: Zener reference element providing fixed 43 V threshold to error amplifier input. Use Value: Maintains ±1% output regulation despite line/load transients due to 50 Ω ZZ and low tempco. | Use Scenario: Clamping gate-source voltage of MOSFETs in 48 V automotive body control units. IC Role / Device Role / Timing Role: Two-terminal shunt protector limiting VGS to safe level during load dump. Use Value: Absorbs 400 W surge pulses (10 μs) without parametric shift, preserving FET reliability. |
| Temperature-Compensated Reference | Waveform Clipping in Signal Conditioning |
Use Scenario: Biasing op-amp inputs in analog sensor front-ends for factory automation sensors. IC Role / Device Role / Timing Role: Precision DC reference with known −2.0 mV/°C drift for offset calibration. Use Value: Enables software-based temperature compensation using measured drift slope and ambient reading. | Use Scenario: Limiting peak amplitude of 0–5 V analog signals from encoders before ADC sampling. IC Role / Device Role / Timing Role: Passive clipper defining hard 43 V upper rail in signal path. Use Value: Prevents ADC saturation with ≤5 μA leakage at 33 V, minimizing signal distortion in high-Z sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | 43 V nominal, 1 W, ZZ = 70 Ω @ 11 mA, DO-41, −2.2 mV/°C | Slightly higher ZZ and more negative tempco; same surge rating. | Acceptable where tighter regulation not required; verify thermal margin with 70 Ω ZZ under load. |
| BZX55-C43 | 43 V nominal, 500 mW, ZZ = 90 Ω @ 5 mA, DO-35, −2.0 mV/°C | Half power rating, higher ZZ, smaller DO-35 package; unsuitable for 1 W sustained dissipation. | Only for low-power signal-level clamping; requires layout change and derating for thermal safety. |
Compared with RD43F-T8-AZ, 1N4749A offers similar voltage but looser regulation and slightly worse thermal drift, while BZX55-C43 sacrifices power handling and impedance performance for size reduction-neither is pin-compatible nor a direct replacement without thermal and stability revalidation.
Availability
RD43F-T8-AZ is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and temperature-compensated reference designs requiring stable component supply and long-lifecycle support.
Supply support for RD43F-T8-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 Japanese semiconductor manufacturer formed in 2010 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and discrete power devices.
RD43F-T8-AZ belongs to the RD2.0F–RD82F planar Zener diode family, designed for standardized, high-reliability voltage regulation and transient suppression in industrial and computing equipment.
FAQ
What is the exact zener voltage tolerance for RD43F-T8-AZ?
The RD43F-T8-AZ is specified as B grade, with a minimum zener voltage of 40 V and maximum of 45 V at 10 mA test current-representing a ±5.8% tolerance band centered on 43 V. This grade is composed of tighter B1–B3 subgrades, but the full B-range applies unless customer requests specific subgrade binning.
Does RD43F-T8-AZ have a defined cathode marking?
Yes, RD43F-T8-AZ uses a black band on the glass body to identify the cathode terminal, consistent with JEDEC DO-41 standard marking. This band must be oriented toward the higher-potential node in reverse-biased Zener operation to ensure proper voltage regulation or clamping function.
What is the maximum allowable junction temperature for RD43F-T8-AZ?
The absolute maximum junction temperature for RD43F-T8-AZ is 175°C, as stated in the Absolute Maximum Ratings table. Operation above this limit risks permanent parametric shift or catastrophic failure; thermal design must ensure Tj remains within spec under worst-case power dissipation and ambient conditions.
Can RD43F-T8-AZ be used in surface-mount designs?
No, RD43F-T8-AZ is a through-hole DO-41 axial package and is not compatible with SMT assembly. Renesas does not offer an SMD variant of this specific part number; alternatives like the SMA封装 BZX84-C43 would require redesign and validation due to differing thermal, electrical, and mechanical behavior.
How does the −2.0 mV/°C temperature coefficient affect RD43F-T8-AZ in precision circuits?
The −2.0 mV/°C temperature coefficient means RD43F-T8-AZ's zener voltage decreases by approximately 2 mV per degree Celsius rise in junction temperature. In precision references, this drift must be compensated-either via circuit topology (e.g., complementary tempcos) or software calibration-especially over >50°C ambient ranges.
RD43F-T8-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-T8-AZ FAQ
1.How can I place an order for RD43F-T8-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD43F-T8-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-T8-AZ reliable?
The price and inventory of RD43F-T8-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-T8-AZ is usually 5 days.
3.What payment methods are accepted for RD43F-T8-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD43F-T8-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD43F-T8-AZ?
RD43F-T8-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD43F-T8-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-T8-AZ?
For technical support, including RD43F-T8-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD43F-T8-AZ requirements.
6.How does Aetrix verify that RD43F-T8-AZ is sourced from the original manufacturer or authorized distributors?
All RD43F-T8-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-T8-AZ meets industry standards.
7.What is the process for return or replacement of RD43F-T8-AZ?
All RD43F-T8-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD43F-T8-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-T8-AZ part is unused and in its original packaging.
Return procedure for RD43F-T8-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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