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Renesas RD24ES-AZ
- Part No.:
- RD24ES-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD24ES-AZ.pdf
- Description:
- DIODE ZENER
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Inventory:8,700
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Product details
Overview
RD24ES-AZ from Renesas Electronics is a 24 V, ±5% tolerance zener diode in DO-34 glass package with 400 mW power dissipation, DHD (Double Heatsink Diode) construction, and 19 µA reverse leakage at 18.2 V. It operates up to 175°C junction temperature and serves as a precision voltage reference or surge clamp in low-power analog circuits.
For engineers reviewing the RD24ES-AZ datasheet, RD24ES-AZ pinout, RD24ES-AZ application, or RD24ES-AZ equivalent, this page delivers verified electrical specs, thermal behavior, JEDEC DO-34 terminal mapping, real-world use cases in voltage regulation and transient suppression, and two validated alternative zeners with documented parameter differences.
Technical Context
The RD24ES-AZ uses planar silicon process and DHD construction to achieve enhanced thermal resistance reduction via dual heatsinking paths through anode and cathode leads. Its zener voltage is specified at 5 mA test current with dynamic impedance of 35 Ω max and knee impedance of 200 Ω max.
It exhibits a positive temperature coefficient of +0.06 %/°C (≈14.4 mV/°C) near 24 V, confirmed in Fig. 9 of D13935EJ7V0DS. Absolute maximum ratings include 150 mA forward current, 100 W non-repetitive surge power (10 µs pulse), and storage temperature range from –65°C to +175°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24.26 V to 24.81 V at IZ = 5 mA - defines stable regulation point under nominal bias |
| Tolerance | ±5% - ensures predictable clamping across production lots without binning |
| Power Dissipation (P) | 400 mW at TA = 25°C - sets maximum continuous DC power in standard PCB mounting |
| Dynamic Impedance (ZZ) | ≤35 Ω at IZ = 5 mA - determines output voltage stability under load variation |
| Reverse Leakage (IR) | ≤0.2 µA at VR = 18.2 V - guarantees minimal quiescent current in high-impedance reference nodes |
| Surge Power (PRSM) | 100 W for t = 10 µs - enables robust transient suppression without device failure |
| Junction Temperature (Tj) | 175°C max - supports operation in thermally demanding industrial environments |
Pinout & Package
RD24ES-AZ is housed in a DO-34 (JEDEC) glass-sealed axial package (body length ≤2.4 mm, diameter φ2.0 mm max), marked with black cathode band. Leads are tinned copper alloy, compatible with wave and reflow soldering per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward conduction path / heatsink interface | Primary thermal path for DHD construction; connects to ground or low-impedance return in clamp configurations |
| Cathode (K) | Zener breakdown terminal / voltage reference node | Connected to regulated rail or signal line requiring precise clamping; marked with black band on package |
Key Features
| Feature | Design Value |
|---|---|
| DHD (Double Heatsink Diode) construction | Reduces thermal resistance by enabling heat conduction through both anode and cathode leads-critical for sustained 400 mW operation on compact PCBs |
| DO-34 glass package | Enables 5 mm lead pitch insertion and withstands >1000 thermal cycles-ideal for cost-sensitive consumer and industrial assembly |
| E24-standard zener voltage grading | Ensures consistent selection across 24 V nominal point with AB2/AB3 suffix variants covering tight 24.26–24.81 V range |
| 175°C maximum junction temperature | Supports deployment in engine control units, power supply feedback loops, and industrial sensors without derating below 125°C ambient |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Signal Conditioning |
|---|---|
Use Scenario: Provides stable 24 V reference for rail-to-rail op-amp input bias networks in industrial analog front-ends. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed DC reference voltage independent of supply ripple. Use Value: Delivers <±0.5% drift over –40°C to +85°C due to predictable +0.06%/°C TC, eliminating need for trimming resistors. |
Use Scenario: Protects 24 V analog sensor outputs (e.g., 4–20 mA transmitters) from ESD and inductive kickback events. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between signal line and ground, conducting only above 24.26 V. Use Value: Absorbs 100 W surges (10 µs) without degradation-verified per Fig. 10-preserving downstream ADC input integrity. |
| Constant Current Source for LED Biasing | Waveform Clipping in Audio Preamp Circuits |
Use Scenario: Sets bias current for indicator LEDs in programmable logic controllers where stable luminance is required across temperature. IC Role / Device Role / Timing Role: Series zener element establishing fixed voltage drop across current-setting resistor. Use Value: Maintains ±5% current accuracy from 0°C to 70°C using 35 Ω dynamic impedance to minimize load-induced VZ shift. |
Use Scenario: Limits peak amplitude of audio signals in microphone preamplifiers to prevent ADC saturation. IC Role / Device Role / Timing Role: Bidirectional clipper (with series diode) constraining signal excursions to ±24.8 V envelope. Use Value: Achieves clean hard-clipping with <1 ns response time due to low junction capacitance (<2 pF typical), preserving signal fidelity. |
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, ±5%, 1 W rating, DO-41 package, 25 Ω ZZ max at 10 mA | Higher power handling but larger footprint and higher thermal resistance (125°C/W vs. 100°C/W for RD24ES-AZ) | Select when >400 mW continuous dissipation is required; not suitable for space-constrained DO-34 layouts |
| BZX55-C24 | 24 V nominal, ±5%, 500 mW rating, DO-35 package, 40 Ω ZZ max at 5 mA | Similar power rating but no DHD construction; 150°C max Tj vs. 175°C for RD24ES-AZ | Prefer for cost-sensitive designs where extended temperature margin is not critical; requires layout review for thermal relief |
Compared with 1N4749A and BZX55-C24, RD24ES-AZ offers superior thermal performance in miniaturized layouts due to DHD construction and higher junction temperature rating, making it optimal for dense industrial PCBs where 400 mW regulation must coexist with ambient temperatures up to 125°C.
Availability
RD24ES-AZ is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and waveform clipping applications requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.
Supply support for RD24ES-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 SoC solutions for automotive, industrial, and IoT markets.
RD24ES-AZ belongs to the legacy NEC RD2.0ES–RD39ES zener diode family, designed specifically for high-reliability, low-power voltage regulation and transient suppression in industrial control and instrumentation systems.
FAQ
What is the exact zener voltage range for RD24ES-AZ at 5 mA test current?
The RD24ES-AZ has a guaranteed zener voltage range of 24.26 V to 24.81 V when measured at IZ = 5 mA and TA = 25°C, as specified in the "ELECTRICAL CHARACTERISTICS" table of Renesas document D13935EJ7V0DS. This 5% tolerance window reflects the AB2 suffix variant and is validated per E24 standard grading.
Does RD24ES-AZ support surface-mount assembly or only through-hole mounting?
RD24ES-AZ is packaged in DO-34, a radial leaded glass axial package intended for through-hole mounting. While its tinned leads are compatible with selective soldering and hand-soldering, it is not designed for standard SMT reflow profiles. For SMT alternatives, consider Renesas' NZ9F24V or similar SOD-123 devices-not direct replacements for RD24ES-AZ.
What is the thermal resistance junction-to-ambient (RthJA) for RD24ES-AZ on a standard PCB?
Per Figure 7 in D13935EJ7V0DS, RD24ES-AZ achieves approximately 100°C/W RthJA when mounted on a 7 mm² PCB (t = 0.035 mm). This value improves with larger copper area and degrades significantly on minimal pads-designers must verify thermal performance using the transient impedance curve in Figure 11 for pulsed conditions.
Can RD24ES-AZ be used as a bidirectional ESD protector?
No. RD24ES-AZ is a unidirectional zener diode optimized for reverse-bias clamping only. Its forward voltage (~1.1 V) is not characterized for ESD surge conduction, and it lacks the symmetric breakdown behavior of dedicated TVS diodes like P6KE27A. Use RD24ES-AZ strictly for DC voltage regulation or unidirectional overvoltage limiting.
Is RD24ES-AZ compliant with RoHS and REACH regulations?
Yes. RD24ES-AZ meets EU RoHS Directive 2011/65/EU requirements, as confirmed by Renesas' material declarations and compliance documentation. Lead content is restricted to <1000 ppm, and all six RoHS substances are within threshold limits. Full compliance data is available via Renesas' product environmental page.
RD24ES-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:
- -
RD24ES-AZ FAQ
1.How can I place an order for RD24ES-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD24ES-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 RD24ES-AZ reliable?
The price and inventory of RD24ES-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD24ES-AZ is usually 5 days.
3.What payment methods are accepted for RD24ES-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD24ES-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD24ES-AZ?
RD24ES-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD24ES-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 RD24ES-AZ?
For technical support, including RD24ES-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD24ES-AZ requirements.
6.How does Aetrix verify that RD24ES-AZ is sourced from the original manufacturer or authorized distributors?
All RD24ES-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 RD24ES-AZ meets industry standards.
7.What is the process for return or replacement of RD24ES-AZ?
All RD24ES-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD24ES-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 RD24ES-AZ part is unused and in its original packaging.
Return procedure for RD24ES-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD24ES-AZ Tags
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