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Renesas RD24E-AZ
- Part No.:
- RD24E-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD24E-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
RD24E-AZ from NEC Corporation is a silicon planar epitaxial Zener diode in SC-76 (SSP) package, rated for 24 V nominal Zener voltage at 5 mA test current, with ±5% tolerance and 500 mW power dissipation, used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the RD24E-AZ datasheet, RD24E-AZ pinout, RD24E-AZ application, or RD24E-AZ equivalent, key selection criteria include Zener voltage accuracy, temperature coefficient, dynamic impedance, maximum reverse leakage, and SC-76 mechanical compatibility in space-constrained PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and input conditions. It exhibits a typical dynamic impedance of 70 Ω at 5 mA and a temperature coefficient of +0.08 %/°C near 24 V, enabling predictable drift compensation in precision references.
The SC-76 (SSP) surface-mount package supports automated placement and reflow soldering, with a cathode band marking polarity and thermal resistance of 300 °C/W junction-to-ambient, limiting continuous power handling without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V ±5% at IZ = 5 mA - defines regulated output voltage with tight tolerance for reference stability |
| Power Dissipation (PZM) | 500 mW - maximum steady-state power before thermal runaway in SC-76 package |
| Dynamic Impedance (ZZT) | 70 Ω at IZ = 5 mA - determines output voltage variation under load current changes |
| Reverse Leakage (IR) | 10 µA max at VR = 19.2 V - ensures minimal shunt loss in high-impedance bias networks |
| Temperature Coefficient | +0.08 %/°C - quantifies VZ drift per degree Celsius near nominal operating point |
Pinout & Package
SC-76 (SSP) is a 2-terminal surface-mount plastic package with cathode marked by a band; total dimensions are 1.6 mm × 0.8 mm × 0.7 mm (L × W × H), lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reverse-biased reference node | Connected to lower-potential side in Zener regulator configuration |
| Cathode | Reverse breakdown terminal / regulated output node | Marked with band; connected to higher-potential side and load reference point |
Key Features
| Feature | Design Value |
|---|---|
| Stable 24 V reference | ±5% tolerance at 5 mA enables accurate mid-range voltage clamping and sensing |
| Low dynamic impedance | 70 Ω minimizes output voltage sag under transient load steps |
| Compact SC-76 footprint | 1.6 × 0.8 mm area saves board space in portable and dense analog modules |
| Polarity identification | Cathode band ensures correct orientation during automated assembly and manual repair |
Applications
| Power Supply Monitoring | ADC Reference Clamp |
|---|---|
Use Scenario: Monitoring 24 V rail integrity in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Zener diode provides overvoltage threshold detection and clamping. Use Value: 24 V ±5% regulation ensures reliable trip point against supply transients without external op-amps. | Use Scenario: Biasing and clamping input range of 12-bit SAR ADCs in sensor signal chains. IC Role / Device Role / Timing Role: Reference clamp limits analog input to safe 24 V ceiling before ADC front-end. Use Value: 70 Ω dynamic impedance prevents distortion during fast input slewing events. |
| LED Current Regulation | Microcontroller Reset Circuit |
Use Scenario: Setting constant current for 24 V LED strings in signage applications. IC Role / Device Role / Timing Role: Zener establishes reference voltage for current-sense amplifier feedback. Use Value: +0.08 %/°C TC allows predictable current drift over –25°C to +85°C ambient. | Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers powered from 24 V supply via LDO. IC Role / Device Role / Timing Role: Voltage reference for external reset supervisor IC or resistor-divider network. Use Value: 10 µA max reverse leakage avoids loading sensitive reset divider resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C24 | Same 24 V ±5% rating but SOT-23 package (2.9 × 1.3 mm); 350 mW PZM | Larger footprint and lower power limit reduce suitability in ultra-dense layouts | Choose BZX84-C24 only if SOT-23 pick-and-place infrastructure is already standardized |
| MMSZ4692 | 24 V ±5%, SC-70 package (2.2 × 1.35 mm); 350 mW PZM; ZZT = 80 Ω | Higher dynamic impedance and larger size compromise regulation fidelity in low-noise designs | Select MMSZ4692 only when SC-70 is mandated by legacy board design |
Compared with BZX84-C24 and MMSZ4692, RD24E-AZ offers superior power handling (500 mW vs. 350 mW) and tighter thermal resistance (300 °C/W) in the smallest footprint (1.6 × 0.8 mm), making it optimal for miniaturized 24 V reference nodes where dissipation and layout density are critical.
Availability
RD24E-AZ is available at Aetrix Electronics and suitable for industrial control systems, sensor interface modules, and embedded power management circuits requiring stable component supply and long-term manufacturability.
Supply support for RD24E-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
NEC Corporation was a Japanese multinational electronics company known for semiconductor innovation, particularly in discrete devices and memory technologies prior to its integration into Renesas Electronics.
RD24E-AZ belongs to NEC's legacy Zener diode product line designed for precision voltage reference and regulation in industrial and instrumentation applications where reliability and parameter consistency were prioritized.
FAQ
What is the Zener voltage tolerance of RD24E-AZ?
The RD24E-AZ has a Zener voltage tolerance of ±5% at 5 mA test current, meaning its actual breakdown voltage falls between 22.8 V and 25.2 V under standard test conditions. This tolerance is specified in NEC's original device documentation and verified across production lots. The RD24E-AZ maintains this specification across its rated operating temperature range.
Does RD24E-AZ support lead-free reflow soldering?
Yes, RD24E-AZ uses a lead-free terminations and complies with RoHS Directive 2011/65/EU. Its SC-76 (SSP) package is qualified for standard Pb-free reflow profiles up to 260 °C peak temperature. The RD24E-AZ thermal characteristics remain stable through JEDEC J-STD-020-compliant solder cycles.
What is the maximum reverse leakage current for RD24E-AZ?
The RD24E-AZ specifies a maximum reverse leakage current of 10 µA at 19.2 V (80% of nominal Zener voltage). This value is measured per NEC's test conditions and reflects worst-case off-state conduction. Designers using RD24E-AZ in high-impedance bias networks must account for this leakage to avoid voltage errors.
Can RD24E-AZ be used in place of a 24 V Zener in an existing SC-76 layout?
Yes, RD24E-AZ is dimensionally compatible with other SC-76 (SSP) Zener diodes and shares identical land pattern requirements. Its cathode band orientation matches industry-standard SC-76 polarity marking. When replacing another 24 V Zener in an SC-76 layout, RD24E-AZ requires no PCB modification.
What is the thermal resistance of RD24E-AZ?
The RD24E-AZ has a junction-to-ambient thermal resistance of 300 °C/W under standard PCB mounting conditions (single-layer copper pad, no thermal vias). This value defines the temperature rise per watt dissipated and is critical for derating calculations. At full 500 mW dissipation, RD24E-AZ junction temperature rises approximately 150 °C above ambient.
RD24E-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:
- -
RD24E-AZ FAQ
1.How can I place an order for RD24E-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD24E-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 RD24E-AZ reliable?
The price and inventory of RD24E-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD24E-AZ is usually 5 days.
3.What payment methods are accepted for RD24E-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD24E-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD24E-AZ?
RD24E-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD24E-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 RD24E-AZ?
For technical support, including RD24E-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD24E-AZ requirements.
6.How does Aetrix verify that RD24E-AZ is sourced from the original manufacturer or authorized distributors?
All RD24E-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 RD24E-AZ meets industry standards.
7.What is the process for return or replacement of RD24E-AZ?
All RD24E-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD24E-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 RD24E-AZ part is unused and in its original packaging.
Return procedure for RD24E-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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