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Renesas RD30ES-T4-AZ
- Part No.:
- RD30ES-T4-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD30ES-T4-AZ.pdf
- Description:
- DIODE ZENER
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Inventory:15,000
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Product details
Overview
RD30ES-T4-AZ from Renesas Electronics is a 30 V ±5% zener diode in DO-34 glass package with 400 mW power dissipation, DHD (Double Heatsink Diode) construction, and 55 Ω dynamic impedance at 5 mA zener current - used for precision voltage regulation and surge suppression in low-power analog circuits.
For engineers reviewing the RD30ES-T4-AZ datasheet, RD30ES-T4-AZ pinout, RD30ES-T4-AZ application, or RD30ES-T4-AZ equivalent, this page delivers verified electrical specs, thermal behavior, JEDEC-compliant DO-34 terminal mapping, and real-world use cases in constant-voltage references and transient protection circuits.
Technical Context
The RD30ES-T4-AZ operates as a silicon planar zener diode with sharp reverse-breakdown knee and stable voltage regulation under DC and pulsed conditions. Its DHD construction enables dual thermal paths to improve heat dissipation in compact PCB layouts.
It exhibits a zener voltage temperature coefficient of +0.055 %/°C (typical), measured at 30 V, and maintains ≤0.2 µA reverse leakage at 23 V - confirming suitability for low-drift reference designs where ambient temperature varies between –65°C and +175°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 29.68–30.51 V at IZ = 5 mA - defines precise clamping threshold for overvoltage protection and reference generation. |
| Dynamic Impedance (ZZ) | 55 Ω max at IZ = 5 mA - ensures minimal voltage deviation under load current changes in feedback loops. |
| Power Dissipation (P) | 400 mW at TA = 25°C - sets maximum continuous DC power handling before thermal derating applies. |
| Surge Reverse Power (PRSM) | 100 W for t = 10 µs - supports transient suppression of short-duration ESD or inductive spikes without failure. |
| Junction Temperature (Tj) | 175°C max - allows operation in high-temperature industrial environments with appropriate board thermal design. |
| Reverse Current (IR) | ≤0.2 µA at VR = 23 V - guarantees low standby leakage in battery-powered or high-impedance sensing circuits. |
Pinout & Package
RD30ES-T4-AZ uses the standard DO-34 (JEDEC) axial glass package: 2.4 mm max body length, 5 mm lead pitch, black cathode band marking, and 25 mm min lead length. The device has two terminals: anode and cathode - no internal connections or multi-pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased zener operation; carries forward current up to 150 mA. |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node during regulation; defines VZ reference point. |
Key Features
| Feature | Design Value |
|---|---|
| DHD construction | Dual heatsink path reduces thermal resistance by ~25% vs. standard DO-34 diodes, improving long-term stability under sustained bias. |
| Planar process | Enables tight VZ tolerance (±5%) and repeatable knee characteristics across production lots for consistent circuit performance. |
| E24-standard VZ | 30 V nominal aligns with IEC 60063 E24 series - simplifies BOM consolidation and cross-referencing with other zener families. |
| DO-34 glass seal | Hermetic glass-to-metal enclosure provides moisture resistance and long-term reliability in non-hermetic industrial enclosures. |
Applications
| Reference Voltage Source | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 30 V reference for ADC biasing and op-amp feedback networks in sensor signal conditioning modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to deliver fixed voltage independent of supply variation. Use Value: Maintains <±1% output drift over –40°C to +85°C ambient when paired with 1 kΩ series resistor, enabling 12-bit measurement accuracy. |
Use Scenario: Protecting microcontroller I/O pins from 33 V rail transients in PLC input modules. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage to 30.5 V peak during fast-rising surges. Use Value: Absorbs 100 W for 10 µs without degradation, preventing latch-up or gate oxide damage in downstream logic. |
| Waveform Clipper | Current Regulator |
Use Scenario: Limiting audio signal peaks to ±30 V in analog line-driver stages to prevent amplifier saturation. IC Role / Device Role / Timing Role: Bidirectional clipping element in series-shunt configuration with series resistor. Use Value: Delivers symmetrical clipping thresholds with <10 ns response time, preserving signal fidelity up to 100 kHz. |
Use Scenario: Setting constant 5 mA bias current for photodiode preamplifiers in optical smoke detectors. IC Role / Device Role / Timing Role: Zener-based current source using VZ/R relationship with series resistor. Use Value: Achieves ±2% current stability over 10:1 supply range due to low ZZ and tight VZ tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5257BRLG | 30 V nominal, ±5%, 500 mW rating, DO-35 package, 35 Ω ZZ at 5 mA | Higher power rating but larger DO-35 footprint; not drop-in compatible with DO-34 pad layout | Select when higher surge margin or lower dynamic impedance is required and board space permits larger package. |
| BZX55-C30 | 30 V nominal, ±5%, 500 mW, DO-35, 30 Ω ZZ at 5 mA, tighter IR spec (≤0.1 µA) | Lower leakage and impedance, but requires rework of solder pads and thermal relief design | Prefer for ultra-low-power IoT sensor nodes where sub-µA standby current is critical and layout revision is feasible. |
Compared with RD30ES-T4-AZ, 1N5257BRLG offers higher power headroom but demands PCB redesign, while BZX55-C30 improves leakage and impedance at the cost of mechanical compatibility - making RD30ES-T4-AZ optimal for legacy DO-34-restricted space-constrained industrial controls.
Availability
RD30ES-T4-AZ is available at Aetrix Electronics and suitable for industrial control systems, sensor interface modules, and power supply supervision circuits requiring stable component supply and long-lifecycle support.
Supply support for RD30ES-T4-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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.
The RD30ES-T4-AZ belongs to the RD2.0ES–RD39ES zener diode family designed for general-purpose voltage regulation and transient suppression in standard-grade industrial and consumer electronics.
FAQ
What is the exact zener voltage range for RD30ES-T4-AZ at 5 mA test current?
The RD30ES-T4-AZ has a guaranteed zener voltage range of 29.68 V to 30.51 V when tested at IZ = 5 mA per the Renesas datasheet D13935EJ7V0DS. This ±5% tolerance aligns with E24 standard values and is validated under pulse conditions (40 ms duration) to avoid self-heating effects. RD30ES-T4-AZ maintains this specification across its qualified operating temperature range.
Does RD30ES-T4-AZ support surge protection, and what is its rated surge capability?
Yes, RD30ES-T4-AZ is rated for non-repetitive surge reverse power of 100 W at pulse width t = 10 µs, as defined in Figure 10 of the official datasheet. This makes it suitable for absorbing ESD events and inductive kickback in relay drivers or motor control inputs. RD30ES-T4-AZ achieves this without parameter shift when operated within its junction temperature limit of 175°C.
What is the thermal resistance and derating behavior of RD30ES-T4-AZ?
RD30ES-T4-AZ exhibits a junction-to-ambient thermal resistance of approximately 375°C/W on a standard 7 mm² PCB (0.035 mm thickness), with linear derating beginning above 25°C ambient. Power dissipation drops to zero at 150°C ambient, per Figure 6. RD30ES-T4-AZ's DHD construction improves heat spreading versus conventional DO-34 diodes, supporting higher average power in constrained layouts.
Is RD30ES-T4-AZ RoHS compliant and what is its quality grade?
RD30ES-T4-AZ meets EU RoHS Directive requirements for restricted substances, as confirmed by Renesas' environmental compliance documentation. It is classified as "Standard" grade per Renesas quality policy - approved for use in computers, office equipment, communications gear, and industrial robots, but not for automotive safety or life-support applications without additional qualification.
How does the dynamic impedance of RD30ES-T4-AZ affect its regulation performance?
RD30ES-T4-AZ has a maximum dynamic impedance of 55 Ω at 5 mA zener current, meaning a 1 mA change in load current causes ≤55 mV output variation. This value is confirmed in the Electrical Characteristics table and directly impacts regulation accuracy in feedback networks. RD30ES-T4-AZ's impedance remains stable below 10 mA, making it well-suited for low-current reference applications.
RD30ES-T4-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:
- -
RD30ES-T4-AZ FAQ
1.How can I place an order for RD30ES-T4-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD30ES-T4-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 RD30ES-T4-AZ reliable?
The price and inventory of RD30ES-T4-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD30ES-T4-AZ is usually 5 days.
3.What payment methods are accepted for RD30ES-T4-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD30ES-T4-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD30ES-T4-AZ?
RD30ES-T4-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD30ES-T4-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 RD30ES-T4-AZ?
For technical support, including RD30ES-T4-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD30ES-T4-AZ requirements.
6.How does Aetrix verify that RD30ES-T4-AZ is sourced from the original manufacturer or authorized distributors?
All RD30ES-T4-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 RD30ES-T4-AZ meets industry standards.
7.What is the process for return or replacement of RD30ES-T4-AZ?
All RD30ES-T4-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD30ES-T4-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 RD30ES-T4-AZ part is unused and in its original packaging.
Return procedure for RD30ES-T4-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD30ES-T4-AZ Tags
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