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Renesas RD24F-T8
- Part No.:
- RD24F-T8
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD24F-T8.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
RD24F-T8 from Renesas Electronics is a 1 W planar-type silicon Zener diode with a nominal zener voltage of 24 V (B3 grade: 23.90–25.14 V), dynamic impedance of 16 Ω at 10 mA, and negative temperature coefficient of +19 mV/°C. It features DO-41 glass-sealed DHD (Double Heatsink Diode) packaging and is used for precision voltage regulation and surge absorption in industrial power supply rails.
For engineers reviewing the RD24F-T8 datasheet, RD24F-T8 pinout, RD24F-T8 application, or RD24F-T8 equivalent, this device serves as a stable 24 V reference in low-power analog circuits, overvoltage clamping in sensor interfaces, and transient protection in 24 V control systems - requiring attention to thermal derating above 25°C ambient and reverse leakage under 10 μA at 19 V.
Technical Context
The RD24F-T8 operates as a two-terminal voltage-reference device relying on controlled avalanche breakdown in its planar silicon junction. Its zener voltage is specified at IZ = 10 mA with ±0.62 V tolerance (B3 grade), and it exhibits a positive temperature coefficient (+19 mV/°C typical) indicating increasing VZ with rising junction temperature.
Thermal performance is defined by a 175°C maximum junction temperature and transient thermal impedance curves showing 150°C/W at 10 ms pulse width. The DO-41 package provides dual heatsink capability via axial leads, enabling 1 W continuous dissipation only when mounted on ≥20 mm² copper foil per Figure 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 23.90–25.14 V at IZ = 10 mA (B3 grade); defines stable regulation point for 24 V rail monitoring |
| Dynamic Impedance (ZZ) | 16 Ω max at IZ = 10 mA; determines output voltage variation under load current changes |
| Reverse Current (IR) | ≤10 μA at VR = 19 V; ensures minimal leakage in standby or high-impedance bias networks |
| Power Dissipation (P) | 1.0 W at TA = 25°C; requires PCB copper area ≥20 mm² to sustain full rating without derating |
| Temp. Coefficient (γZ) | +19 mV/°C typical; indicates VZ rises ~0.46 V across 25°C to 50°C ambient range |
| Junction Temp. (Tj) | 175°C max; limits operating ambient based on thermal resistance and power dissipation |
| Surge Power (PRSM) | 400 W at t = 10 μs; supports single-event ESD or lightning-induced transients per Figure 7 |
Pinout & Package
RD24F-T8 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-biased regulation configuration |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node to maintain reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| 1 W Planar Zener Structure | Enables stable voltage reference with tight VZ tolerance and repeatable breakdown characteristics |
| DO-41 Glass Sealing | Provides hermetic protection against moisture and contaminants in industrial environments |
| E24 Voltage Series Compliance | Supports standardized BOM consolidation across 2–82 V zener families with consistent test conditions |
| Dual Heatsink Diode (DHD) Design | Improves thermal transfer through both axial leads, reducing RθJA by up to 30% vs. standard DO-41 |
| B3 Voltage Grade Option | Offers narrowest VZ spread (±0.62 V) for applications demanding tighter regulation accuracy |
Applications
| Industrial Power Supply Monitoring | Sensor Signal Conditioning |
|---|---|
Use Scenario: Monitoring 24 V DC input rail in PLC I/O modules to detect undervoltage or overvoltage faults. IC Role / Device Role / Timing Role: Zener reference element providing threshold voltage for comparator input. Use Value: Enables accurate trip point at 24 V ±2.5% using B3-grade tolerance and low ZZ to minimize comparator hysteresis error. | Use Scenario: Clamping amplified thermocouple output to prevent ADC saturation during EMI events. IC Role / Device Role / Timing Role: Bidirectional transient limiter placed between op-amp output and ADC input. Use Value: Limits signal swing to ≤25.14 V while maintaining <16 Ω dynamic impedance for minimal signal distortion at 10 kHz bandwidth. |
| Programmable Logic Controller Inputs | Automotive Body Control Modules |
Use Scenario: Providing regulated 24 V reference for optocoupler LED drive in isolated digital input circuits. IC Role / Device Role / Timing Role: Stable voltage source ensuring consistent LED forward current across temperature. Use Value: Maintains ±3% LED current stability from −40°C to +85°C due to predictable γZ and low IR drift. | Use Scenario: Surge suppression on 24 V LIN bus power line in door module ECUs. IC Role / Device Role / Timing Role: Primary clamp protecting downstream LDO and microcontroller VCC. Use Value: Absorbs 400 W transients (10 μs) without degradation, meeting ISO 7637-2 Pulse 1/2 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | 24 V nominal, 1 W, DO-41, ZZ = 15 Ω @ 10 mA, γZ = +19 mV/°C - nearly identical specs but ±5% VZ tolerance (vs. RD24F-T8 B3 ±2.6%) | Less precise regulation in closed-loop feedback; suitable where cost outweighs accuracy | Select 1N4749A only if ±5% VZ tolerance is acceptable and legacy design reuse is required |
| BZX85C24 | 24 V nominal, 1.3 W, DO-41, ZZ = 20 Ω @ 5 mA, γZ = +18 mV/°C - higher power rating but looser VZ tolerance (±5%) and higher ZZ | Marginally better thermal headroom but reduced regulation stability under dynamic loads | Prefer BZX85C24 only when >1 W pulsed dissipation is needed and tighter VZ control is not critical |
Compared with 1N4749A and BZX85C24, RD24F-T8 delivers superior voltage accuracy (±2.6% vs. ±5%), lower dynamic impedance (16 Ω vs. 15–20 Ω), and guaranteed B3-grade binning - making it optimal for industrial systems requiring repeatable 24 V reference behavior across temperature and production lots.
Availability
RD24F-T8 is available at Aetrix Electronics and suitable for industrial automation, sensor interface design, and automotive body electronics requiring stable component supply with traceable lot history and long-term continuity planning.
Supply support for RD24F-T8 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 specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.
RD24F-T8 belongs to the RD2.0F–RD82F planar zener diode family designed specifically for high-reliability voltage regulation and transient suppression in industrial power systems - emphasizing thermal robustness, tight voltage grading, and DO-41 mechanical reliability.
FAQ
What is the exact zener voltage range for RD24F-T8 at 10 mA test current?
The RD24F-T8 is specified in the B3 voltage grade, with a zener voltage range of 23.90 V to 25.14 V measured at IZ = 10 mA and TA = 25°C. This 1.24 V span corresponds to ±2.6% tolerance around the nominal 24 V rating, as confirmed in the Electrical Characteristics table of Renesas data sheet D13936EJ5V0DS.
Does RD24F-T8 have a positive or negative temperature coefficient, and what is its typical value?
RD24F-T8 has a positive zener voltage temperature coefficient (γZ) of +19 mV/°C typical, as stated in the Electrical Characteristics table. This means its zener voltage increases by approximately 19 mV for every 1°C rise in junction temperature - a characteristic confirmed for all RD22F through RD30F devices in the same family.
What is the maximum allowable reverse leakage current for RD24F-T8, and at what voltage is it tested?
The maximum reverse current (IR) for RD24F-T8 is 10 μA, tested at a reverse voltage (VR) of 19 V and ambient temperature of 25°C. This value is explicitly listed in the Electrical Characteristics table and reflects the device's low-leakage performance critical for high-impedance biasing applications.
Can RD24F-T8 be used in surge protection applications, and what is its rated surge power capability?
Yes, RD24F-T8 is rated for surge reverse power (PRSM) of 400 W at a pulse width of 10 μs, as shown in Absolute Maximum Ratings and Figure 7 of the datasheet. This makes it suitable for absorbing short-duration transients such as ESD or inductive switching spikes in 24 V industrial control lines.
What package type does RD24F-T8 use, and how is polarity marked on the device?
RD24F-T8 uses the JEDEC-standard DO-41 axial-leaded glass package. Polarity is marked by a black cathode band located near one end of the cylindrical glass body - the lead adjacent to the black band is the cathode, and the opposite lead is the anode, as illustrated in the Package Drawing on page 2 of data sheet D13936EJ5V0DS.
RD24F-T8 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:
- -
RD24F-T8 FAQ
1.How can I place an order for RD24F-T8 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD24F-T8 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 RD24F-T8 reliable?
The price and inventory of RD24F-T8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD24F-T8 is usually 5 days.
3.What payment methods are accepted for RD24F-T8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD24F-T8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD24F-T8?
RD24F-T8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD24F-T8 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 RD24F-T8?
For technical support, including RD24F-T8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD24F-T8 requirements.
6.How does Aetrix verify that RD24F-T8 is sourced from the original manufacturer or authorized distributors?
All RD24F-T8 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 RD24F-T8 meets industry standards.
7.What is the process for return or replacement of RD24F-T8?
All RD24F-T8 units undergo pre-shipment inspection (PSI). If there is an issue with RD24F-T8, 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 RD24F-T8 part is unused and in its original packaging.
Return procedure for RD24F-T8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD24F-T8 Tags
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