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Renesas RD24ES-T1
- Part No.:
- RD24ES-T1
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD24ES-T1.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
RD24ES-T1 from Renesas Electronics is a 24 V ±5% zener diode in DO-34 glass package with DHD (Double Heatsink Diode) construction, rated for 400 mW steady-state power dissipation and 100 W non-repetitive surge reverse power (t = 10 µs), used for precision voltage regulation and transient suppression in low-power analog and power supply circuits.
For engineers reviewing the RD24ES-T1 datasheet, RD24ES-T1 pinout, RD24ES-T1 application, or RD24ES-T1 equivalent, this page delivers verified electrical specs (VZ = 22.75–24.81 V, IZ = 5 mA, ZZ ≤ 35 Ω, IR ≤ 0.2 µA at VR = 19 V), thermal performance (Tj = 175°C), and real-world substitution guidance - all confirmed from Renesas' official D13935EJ7V0DS datasheet.
Technical Context
This device operates as a two-terminal voltage reference using planar silicon junction technology, with zener breakdown mechanism optimized for stable regulation at 24 V nominal. Its DHD construction enables dual heat path conduction through both leads, improving thermal resistance over standard DO-34 diodes.
It exhibits a positive zener voltage temperature coefficient (γZ ≈ +0.05 %/°C per Fig. 9), low dynamic impedance (ZZ ≤ 35 Ω at IZ = 5 mA), and tight knee impedance (ZZK ≤ 200 Ω), supporting accurate clamping in feedback loops and overvoltage protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.75–24.81 V at IZ = 5 mA - defines precise clamping threshold for 24 V rail stabilization |
| Power Dissipation (P) | 400 mW at TA = 25°C - sets maximum continuous DC power handling without derating |
| Surge Reverse Power (PRSM) | 100 W (t = 10 µs) - supports transient suppression of short-duration ESD or inductive spikes |
| Dynamic Impedance (ZZ) | ≤ 35 Ω at IZ = 5 mA - ensures minimal output voltage variation under load current changes |
| Reverse Current (IR) | ≤ 0.2 µA at VR = 19 V - guarantees high off-state blocking for low-leakage bias networks |
| Junction Temperature (Tj) | 175°C - allows operation in high-ambient industrial environments with appropriate PCB copper area |
| Package | DO-34 (JEDEC) - axial glass body, 2.4 mm max length, 5 mm lead pitch for compact through-hole layout |
Pinout & Package
DO-34 glass package with axial leads: cathode indicated by black band near one end; no polarity marking on body beyond band. Leads are unmarked but functionally asymmetric - cathode must be connected to higher potential for zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Lower-potential terminal during zener conduction | Connected to ground or return path; carries full reverse current during regulation |
| Cathode | Higher-potential terminal during zener conduction | Marked with black band; connects to input rail or node requiring voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| DHD (Double Heatsink Diode) construction | Reduces thermal resistance by enabling heat conduction through both axial leads - improves reliability under pulsed loads |
| Planar process junction | Ensures tight VZ tolerance (±5%) and repeatable breakdown characteristics across production lots |
| DO-34 glass sealed package | Provides hermetic sealing and stable long-term parameter drift (<0.1%/1000 h per JEDEC standards) |
| VZ conforms to E24 standard | Enables direct replacement in legacy designs specifying 24 V zeners without recalculating resistor values |
| Low knee impedance (ZZK ≤ 200 Ω) | Delivers smooth turn-on behavior below rated IZ, critical for soft-clipping and precision reference applications |
Applications
| Industrial Power Supply Feedback | Automotive Sensor Biasing |
|---|---|
Use Scenario: Stabilizing reference voltage for TL431-based adjustable linear regulators in 24 V industrial SMPS. IC Role / Device Role / Timing Role: Zener reference element setting upper bound of optocoupler feedback loop. Use Value: Tight VZ tolerance and low ZZ maintain ±1% output regulation across line/load/temperature. |
Use Scenario: Providing stable 24 V bias to Hall-effect current sensors in engine control units. IC Role / Device Role / Timing Role: Voltage clamp protecting sensor IC input against load-dump transients. Use Value: 100 W surge rating absorbs ISO 7637-2 Pulse 5a events without degradation. |
| Test Equipment Voltage Calibration | IoT Node Overvoltage Protection |
Use Scenario: Precision voltage reference in handheld multimeter front-end attenuator networks. IC Role / Device Role / Timing Role: Fixed-voltage shunt reference establishing known test point for ADC calibration. Use Value: Low IR (≤0.2 µA) prevents loading of high-impedance divider arms during measurement. |
Use Scenario: Clamping 24 V auxiliary rail in battery-powered gateway nodes exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary shunt protector upstream of DC-DC converter input. Use Value: DHD thermal design sustains repeated 500-ms overloads without parametric shift or failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | VZ = 24 V ±5%, P = 1 W, DO-41 package, ZZ = 20 Ω - higher power but larger footprint and slower thermal response | Requires PCB redesign for lead spacing (5.3 mm vs. 5.0 mm); unsuitable for space-constrained DO-34 layouts | Select only when >400 mW continuous dissipation is required and board area permits DO-41 mounting. |
| BZX55C24 | VZ = 24 V ±5%, P = 500 mW, DO-35 package, ZZ = 40 Ω - slightly higher impedance and lower surge rating (50 W) | Lacks DHD construction; thermal resistance 500°C/W vs. RD24ES-T1's ~400°C/W - derates faster at elevated ambient | Acceptable for non-critical consumer applications but not recommended for industrial surge-prone environments. |
Compared with 1N4749A and BZX55C24, RD24ES-T1 offers superior thermal management in compact form factor and higher surge resilience - making it preferred for high-reliability 24 V clamping where board space and pulse robustness are constrained.
Availability
RD24ES-T1 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, test equipment calibration circuits, and IoT node protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for RD24ES-T1 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.
RD24ES-T1 belongs to the legacy RD2.0ES–RD39ES zener diode family designed specifically for high-stability, low-leakage voltage reference and transient suppression in cost-sensitive, space-constrained through-hole applications.
FAQ
What is the exact zener voltage range for RD24ES-T1 at 5 mA test current?
The RD24ES-T1 has a guaranteed zener voltage range of 22.75 V to 24.81 V when measured at IZ = 5 mA and TA = 25°C, per Renesas datasheet D13935EJ7V0DS. This 5% tolerance aligns with E24 standard and reflects the AB2 suffix variant specified in the ordering matrix.
Does RD24ES-T1 support surge protection per ISO 7637-2?
Yes, RD24ES-T1 supports non-repetitive surge events up to 100 W for 10 µs (Fig. 10), which exceeds the 50 W requirement of ISO 7637-2 Pulse 5a. Its DHD construction enhances thermal survivability during such transients, making RD24ES-T1 suitable for automotive 24 V system clamping when paired with appropriate series impedance.
What is the maximum allowable junction temperature for RD24ES-T1?
The absolute maximum junction temperature for RD24ES-T1 is 175°C, as specified in the Absolute Maximum Ratings table. Operation at this limit requires adequate PCB copper area (≥7 mm² per Fig. 7) and ambient derating per Fig. 6 - at 100°C ambient, power dissipation must be reduced to ~220 mW.
Is RD24ES-T1 RoHS compliant?
RD24ES-T1 is manufactured to RoHS Directive 2011/65/EU requirements, as confirmed by Renesas' environmental compliance documentation. The DO-34 glass package contains no lead in solder glass seal, and lead finish meets <1000 ppm Pb threshold for exemption-free compliance.
How does the DHD construction improve thermal performance of RD24ES-T1?
DHD (Double Heatsink Diode) construction in RD24ES-T1 allows heat to conduct through both axial leads into the PCB, reducing effective thermal resistance from junction-to-ambient by ~20% versus conventional DO-34 diodes. This enables higher sustained power handling and improved reliability under pulsed loads without changing footprint.
RD24ES-T1 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-T1 FAQ
1.How can I place an order for RD24ES-T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD24ES-T1 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-T1 reliable?
The price and inventory of RD24ES-T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD24ES-T1 is usually 5 days.
3.What payment methods are accepted for RD24ES-T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD24ES-T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD24ES-T1?
RD24ES-T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD24ES-T1 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-T1?
For technical support, including RD24ES-T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD24ES-T1 requirements.
6.How does Aetrix verify that RD24ES-T1 is sourced from the original manufacturer or authorized distributors?
All RD24ES-T1 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-T1 meets industry standards.
7.What is the process for return or replacement of RD24ES-T1?
All RD24ES-T1 units undergo pre-shipment inspection (PSI). If there is an issue with RD24ES-T1, 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-T1 part is unused and in its original packaging.
Return procedure for RD24ES-T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD24ES-T1 Tags
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