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Renesas RD24F-T8-AZ
- Part No.:
- RD24F-T8-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD24F-T8-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
RD24F-T8-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed package, rated for 23.9 V to 25.14 V zener voltage (B3 grade), 10 Ω dynamic impedance at 10 mA, and −21 mV/°C temperature coefficient. It operates with 10 μA reverse current at 19 V and supports surge reverse power up to 400 W (10 μs pulse), commonly used in precision voltage reference and overvoltage protection circuits.
For engineers reviewing the RD24F-T8-AZ datasheet, RD24F-T8-AZ pinout, RD24F-T8-AZ application, or RD24F-T8-AZ equivalent, this device serves as a stable, low-drift voltage clamp in industrial power supplies, sensor signal conditioning, and analog front-end protection where ±5% zener tolerance and thermal stability are critical.
Technical Context
This Zener diode employs a planar junction structure with double heatsink (DHD) glass sealing for enhanced thermal dissipation and long-term stability. Its B3 voltage grade ensures tight 23.9–25.14 V tolerance at 10 mA test current, and its negative temperature coefficient (−21 mV/°C) enables predictable drift compensation in bias networks.
The device meets JEDEC DO-41 mechanical standards, supports 175°C maximum junction temperature, and delivers 10 Ω dynamic impedance - optimized for low-noise regulation in feedback loops and reference shunt paths without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 23.9 V min / 25.14 V max at IZ = 10 mA - defines precise clamping threshold for overvoltage protection |
| Dynamic Impedance (ZZ) | 10 Ω max at IZ = 10 mA - ensures minimal voltage shift under load transients |
| Reverse Current (IR) | 10 μA max at VR = 19 V - guarantees low leakage in high-impedance bias networks |
| Temperature Coefficient (γZ) | −21 mV/°C typical - enables predictable thermal drift compensation in precision references |
| Power Dissipation (P) | 1.0 W at TA = 25°C - sets continuous DC power limit; derates linearly above 25°C ambient |
| Surge Reverse Power (PRSM) | 400 W at t = 10 μs - supports transient suppression of ESD or inductive kick events |
| Junction Temperature (Tj) | 175°C max - determines maximum allowable thermal rise before reliability degradation |
Pinout & Package
RD24F-T8-AZ uses a standard DO-41 axial-leaded glass package per JEDEC. Cathode is marked by a black band on the body. Leads are tinned copper-clad steel, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased operation; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal | Connected to higher-potential node; establishes regulated voltage reference point when reverse biased |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range (2–82 V) | Enables single-family standardization across diverse supply rail voltages |
| E24 series nominal values | Ensures compatibility with standard resistor and capacitor value planning |
| B3-grade voltage tolerance | Provides tighter 23.9–25.14 V spread than B/B1/B2 grades for improved system accuracy |
| Planar-type DHD structure | Delivers superior thermal resistance and long-term parameter stability vs. alloy-junction diodes |
| DO-41 glass package | Offers proven reliability, moisture resistance, and compatibility with automated assembly |
Applications
| Industrial Power Supply Regulation | Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role: Shunt voltage reference providing precise 24 V clamp for optocoupler biasing. Use Value: Maintains ±1% output regulation over temperature due to low ZZ and predictable γZ. |
Use Scenario: Protecting ADC input pins from overvoltage during field wiring faults. IC Role / Device Role: Low-leakage clamping element limiting input to 24.5 V absolute maximum. Use Value: Prevents damage while adding <10 nA leakage at 20 V, preserving signal integrity. |
| Automotive Body Control Module | Test & Measurement Equipment |
Use Scenario: Providing stable reference for LIN bus transceiver bias in 12 V vehicle systems. IC Role / Device Role: Zener-based voltage supervisor ensuring clean reset thresholds. Use Value: Survives load-dump pulses (ISO 7637-2) via 400 W surge rating without degradation. |
Use Scenario: Calibrating voltage ranges in bench multimeters and programmable power supplies. IC Role / Device Role: Primary shunt reference in precision voltage divider networks. Use Value: Delivers <50 ppm/°C effective drift after compensation, meeting Class II accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5249BS | 24 V nominal, SOD-123 surface-mount package, 15 Ω ZZ, +12 mV/°C γZ | Requires PCB rework for SMT layout; positive TC limits use in temp-compensated references | Select when board space is constrained and thermal performance is secondary to footprint |
| Vishay 1N5249B | 24 V nominal, DO-35 axial package, 15 Ω ZZ, −20 mV/°C γZ, 0.5 W rating | Lower power rating restricts use in sustained clamp applications; identical DO-style mounting | Select for legacy DO-35 designs where 1 W dissipation is not required |
Compared with RD24F-T8-AZ, MMBZ5249BS trades axial reliability and thermal margin for miniaturization, while 1N5249B retains mechanical compatibility but sacrifices 50% power handling - making RD24F-T8-AZ optimal for thermally demanding, high-reliability 24 V clamp roles.
Availability
RD24F-T8-AZ is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and automotive control units requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for RD24F-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 global semiconductor leader delivering microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
RD24F-T8-AZ belongs to the RD2.0F–RD82F planar Zener diode family, designed specifically for high-stability voltage regulation and transient suppression in cost-sensitive, high-volume applications where DO-41 reliability and E24-standardized values are essential.
FAQ
What is the exact zener voltage range for RD24F-T8-AZ?
The RD24F-T8-AZ has a guaranteed zener voltage range of 23.9 V minimum to 25.14 V maximum when tested at 10 mA zener current (IZ), corresponding to its B3 voltage classification per Renesas datasheet D13936EJ5V0DS. This tolerance band ensures consistent clamping behavior across production lots without binning.
Does RD24F-T8-AZ support surge protection applications?
Yes, RD24F-T8-AZ supports surge protection with a rated surge reverse power (PRSM) of 400 W for 10 μs pulses at 25°C ambient, as specified in Figure 7 of the official datasheet. Its DO-41 glass package and planar DHD structure enable robust energy absorption without parametric shift under repetitive transients.
What is the thermal resistance characteristic of RD24F-T8-AZ?
RD24F-T8-AZ exhibits a transient thermal impedance (Zth) of approximately 150°C/W at 10 ms (Figure 8), and its steady-state power derating follows the curve in Figure 1: 1.0 W at 25°C ambient, decreasing linearly to zero at 175°C. This allows accurate thermal design in enclosed power supplies.
Is RD24F-T8-AZ RoHS compliant?
Yes, RD24F-T8-AZ complies with the EU RoHS Directive, as confirmed by Renesas Electronics' environmental compliance documentation. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and is suitable for environmentally regulated industrial and consumer applications.
Can RD24F-T8-AZ be used in place of older NEC RD24F variants?
Yes, RD24F-T8-AZ is a direct continuation of the original NEC RD24F product line under Renesas Electronics post-merger branding. It maintains identical electrical specifications, DO-41 mechanical dimensions, and marking conventions - ensuring full form-fit-function compatibility with legacy designs using NEC-specified RD24F parts.
RD24F-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:
- -
RD24F-T8-AZ FAQ
1.How can I place an order for RD24F-T8-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD24F-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 RD24F-T8-AZ reliable?
The price and inventory of RD24F-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 RD24F-T8-AZ is usually 5 days.
3.What payment methods are accepted for RD24F-T8-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD24F-T8-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD24F-T8-AZ?
RD24F-T8-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD24F-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 RD24F-T8-AZ?
For technical support, including RD24F-T8-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD24F-T8-AZ requirements.
6.How does Aetrix verify that RD24F-T8-AZ is sourced from the original manufacturer or authorized distributors?
All RD24F-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 RD24F-T8-AZ meets industry standards.
7.What is the process for return or replacement of RD24F-T8-AZ?
All RD24F-T8-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD24F-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 RD24F-T8-AZ part is unused and in its original packaging.
Return procedure for RD24F-T8-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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