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Renesas RD2.4F-AZ
- Part No.:
- RD2.4F-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD2.4F-AZ.pdf
- Description:
- DIODE ZENER
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Product details
Overview
RD2.4F-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed package, with nominal zener voltage 2.4 V (B2 grade: 2.41–2.65 V), dynamic impedance ≤15 Ω at 40 mA, and temperature coefficient −2.0 mV/°C. It delivers stable voltage reference and surge protection in low-voltage power rails and signal conditioning circuits.
For engineers reviewing the RD2.4F-AZ datasheet, RD2.4F-AZ pinout, RD2.4F-AZ application, or RD2.4F-AZ equivalent, this page provides verified electrical specs, thermal behavior, JEDEC DO-41 terminal mapping, and validated alternative parts for voltage reference and overvoltage clamp design.
Technical Context
This Zener diode operates in reverse breakdown to maintain precise voltage regulation under varying load and temperature conditions. Its planar DHD (Double Heatsink Diode) structure enables 1 W continuous power dissipation and supports surge reverse power up to 400 W for 10 μs pulses.
The device exhibits a negative temperature coefficient of −2.0 mV/°C at 40 mA test current, indicating decreasing zener voltage with rising junction temperature - critical for thermal stability analysis in compact PCB layouts where self-heating occurs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.41–2.65 V at IZ = 40 mA - defines tight regulation window for 2.4 V reference circuits |
| Dynamic Impedance (ZZ) | ≤15 Ω at IZ = 40 mA - ensures minimal output voltage deviation under load transients |
| Power Dissipation (P) | 1.0 W at TA = 25°C - sets maximum steady-state thermal load on PCB copper area |
| Surge Reverse Power (PRSM) | 400 W (t = 10 μs) - enables single-pulse transient suppression without failure |
| Zener Temp. Coefficient (γZ) | −2.0 mV/°C - quantifies voltage drift per degree rise; requires thermal derating above 25°C ambient |
| Reverse Current (IR) | ≤200 μA at VR = 0.5 V - confirms low leakage in standby mode for battery-powered systems |
| Junction Temperature (Tj) | 175°C - establishes absolute thermal limit for reliability modeling and heatsinking decisions |
Pinout & Package
RD2.4F-AZ uses JEDEC DO-41 glass-sealed axial package (3.0 mm Ø × 5.0 mm max length) with cathode indicated by 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 Zener operation; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher potential side to enable controlled reverse breakdown at VZ |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage series (2–82 V) | Enables standardized BOM across multiple voltage rails using same footprint and thermal profile |
| E24 nominal voltage grading | Supports precise selection within 5% tolerance steps for cost-sensitive industrial designs |
| DO-41 glass-sealed DHD structure | Provides mechanical robustness and consistent thermal resistance (Rth) across production lots |
| 175°C maximum junction temperature | Allows operation in high-ambient environments such as enclosed power supplies or automotive under-hood modules |
| −65 to +175°C storage range | Permits long-term warehouse storage and reflow-compatible assembly without parametric shift |
Applications
| Low-Voltage Reference Circuit | Waveform Clipping |
|---|---|
Use Scenario: Providing stable 2.4 V bias for op-amp input stages or ADC reference dividers in portable instrumentation. IC Role / Device Role / Timing Role: Zener voltage reference element establishing precision DC offset point. Use Value: Tight 2.41–2.65 V tolerance and −2.0 mV/°C TC enable <±10 mV drift over 0–70°C ambient without active compensation. | Use Scenario: Limiting analog sensor output swing to protect downstream microcontroller GPIOs from overvoltage. IC Role / Device Role / Timing Role: Passive clipping diode clamping signal peaks at ~2.4 V above ground. Use Value: Low dynamic impedance (≤15 Ω) ensures sharp knee and minimal distortion during fast-rising transients. |
| Surge Absorption | Constant-Current Bias |
Use Scenario: Protecting RS-232 line receivers from ESD events and inductive kickback in industrial control panels. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing short-duration energy spikes. Use Value: 400 W surge rating at 10 μs allows safe dissipation of IEC 61000-4-2 Level 4 contact discharge energy without degradation. | Use Scenario: Generating fixed bias current for LED drivers or phototransistor amplifiers in optical encoders. IC Role / Device Role / Timing Role: Current-regulating element via series resistor + Zener drop. Use Value: Stable 1 W power handling supports ≥40 mA bias current with predictable thermal behavior on standard FR-4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4730A | Zener voltage 3.9 V (min/max 3.71–4.09 V); higher VZ, +2.5 mV/°C TC | Not suitable for 2.4 V reference; used where higher clamp threshold required | Select only if system requires ≥3.9 V regulation and can accommodate positive TC drift |
| BZX55C2V4 | Zener voltage 2.4 V (2.2–2.6 V); same nominal value but ±8% tolerance vs. RD2.4F-AZ's ±5.2% (B2) | Acceptable for non-critical biasing; less precise for metrology-grade references | Prefer RD2.4F-AZ when tighter VZ distribution and lower ZZ are needed for low-noise analog stages |
Compared with 1N4730A and BZX55C2V4, RD2.4F-AZ offers the narrowest voltage tolerance (±5.2%), lowest dynamic impedance (≤15 Ω), and optimized thermal coefficient (−2.0 mV/°C) specifically for 2.4 V precision reference and low-drift clamp applications.
Availability
RD2.4F-AZ is available at Aetrix Electronics and suitable for low-voltage reference circuits, waveform clipping, surge absorption, and constant-current bias applications requiring stable component supply across industrial, instrumentation, and embedded control programs.
Supply support for RD2.4F-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 headquartered in Japan, specializing in microcontrollers, analog and power devices, and advanced SoCs for industrial, automotive, and infrastructure markets.
RD2.4F-AZ belongs to the RD2.0F–RD82F planar Zener diode family designed for high-reliability voltage regulation and transient suppression in standard-grade electronic equipment including office automation, test instruments, and consumer appliances.
FAQ
What is the exact zener voltage range for RD2.4F-AZ?
The RD2.4F-AZ has a guaranteed zener voltage range of 2.41 V to 2.65 V at 40 mA test current (B2 grade), per Renesas datasheet D13936EJ5V0DS. This 5.2% tolerance window reflects tighter binning than generic 5% Zeners and is confirmed by factory testing under 40 ms pulse conditions.
Does RD2.4F-AZ support surge protection applications?
Yes, RD2.4F-AZ supports surge protection with a rated surge reverse power of 400 W for 10 μs pulses (per Figure 7). Its DO-41 DHD structure and 175°C junction rating allow reliable single-event transient absorption in industrial interfaces like RS-232 or sensor inputs without permanent parameter shift.
What is the thermal resistance characteristic of RD2.4F-AZ?
RD2.4F-AZ exhibits transient thermal impedance (Zth) of ~150°C/W at 100 ms (Figure 8), and its steady-state thermal resistance depends on PCB copper area - e.g., 200°C/W with 5 mm² foil, 120°C/W with 20 mm² (Figure 2). Derating curves in Figure 1 confirm 1 W operation only at TA ≤ 50°C with adequate heatsinking.
Is RD2.4F-AZ RoHS compliant?
Yes, RD2.4F-AZ complies with EU RoHS Directive requirements. Renesas confirms environmental compatibility in official documentation, and the device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits - verified through material declarations and manufacturing process controls.
What is the maximum forward current rating for RD2.4F-AZ?
The maximum forward current for RD2.4F-AZ is 200 mA at TA = 25°C (Absolute Maximum Ratings table). This rating applies during forward conduction - e.g., in half-wave rectifier or polarity-protection configurations - and must be derated linearly above 25°C ambient per the device's thermal characteristics.
RD2.4F-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:
- -
RD2.4F-AZ FAQ
1.How can I place an order for RD2.4F-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD2.4F-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 RD2.4F-AZ reliable?
The price and inventory of RD2.4F-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD2.4F-AZ is usually 5 days.
3.What payment methods are accepted for RD2.4F-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD2.4F-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD2.4F-AZ?
RD2.4F-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD2.4F-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 RD2.4F-AZ?
For technical support, including RD2.4F-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD2.4F-AZ requirements.
6.How does Aetrix verify that RD2.4F-AZ is sourced from the original manufacturer or authorized distributors?
All RD2.4F-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 RD2.4F-AZ meets industry standards.
7.What is the process for return or replacement of RD2.4F-AZ?
All RD2.4F-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD2.4F-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 RD2.4F-AZ part is unused and in its original packaging.
Return procedure for RD2.4F-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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