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Renesas RD39ES-AZ
- Part No.:
- RD39ES-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD39ES-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
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Inventory:20,380
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Product details
Overview
RD39ES-AZ from Excel Semiconductor is a DO-34 glass-sealed Zener diode with nominal zener voltage 39 V (min 36.63 V, max 38.52 V at 5 mA), dynamic impedance 85 Ω, and surge reverse power rating of 100 W. It operates within -65 °C to +175 °C storage range and supports constant-voltage regulation in low-power analog circuits.
For engineers reviewing the RD39ES-AZ datasheet, RD39ES-AZ pinout, RD39ES-AZ application, or RD39ES-AZ equivalent, key selection criteria include its 39 V zener tolerance (±2.5%), DO-34 axial package compatibility with 5 mm PCB pitch, 400 mW steady-state power dissipation, and 0.2 μA reverse leakage at 30 V.
Technical Context
This Zener diode uses planar process technology and conforms to E24 standard voltage grading. Its 39 V nominal breakdown is specified at 5 mA test current, with knee impedance ≤250 Ω at 5 mA and reverse current ≤0.2 μA at VR = 30 V.
The device features a glass-passivated junction in a hermetically sealed DO-34 package, enabling stable voltage reference performance under transient surge conditions up to 100 W for short pulses. Junction temperature is rated to 175 °C, supporting operation in thermally demanding industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 36.63–38.52 V at Iz = 5 mA - defines precise clamping threshold for overvoltage protection |
| Dynamic Impedance (Zzt) | 85 Ω max at Iz = 5 mA - determines output voltage stability under load variation |
| Power Dissipation (Pv) | 400 mW at Tj = 25 °C - sets maximum continuous DC power handling on standard PCB |
| Surge Reverse Power (PRSM) | 100 W - enables transient suppression of high-energy spikes without failure |
| Reverse Current (IR) | ≤0.2 μA at VR = 30 V - ensures minimal leakage in standby or precision bias networks |
| Junction Temperature (Tj) | 175 °C max - supports reliable operation in enclosed or high-ambient industrial enclosures |
| Package | DO-34 glass axial - allows manual or wave soldering with 5 mm pitch, cathode band marked |
Pinout & Package
RD39ES-AZ is housed in a DO-34 glass axial package with two terminals: anode and cathode. Cathode is identified by a painted band. The package measures 29 ±1 mm length, Φ1.8 ±0.2 mm diameter, with lead diameter 0.4 ±0.1 mm and spacing 2.7 ±0.3 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential node to enable voltage regulation |
Key Features
| Feature | Design Value |
|---|---|
| DO-34 glass seal | Hermetic encapsulation ensures long-term parameter stability and moisture resistance |
| E24-standard Vz grading | Enables predictable interchangeability across 39 V Zener variants in production |
| Planar junction process | Delivers tight Zzt control and repeatable knee characteristics for precision clamping |
| 100 W surge rating | Withstands IEC 61000-4-5 Level 3 surges without degradation in power supply rails |
| 5 mm PCB insertion pitch | Supports high-density through-hole layouts while maintaining mechanical robustness |
Applications
| Industrial Power Supply Regulation | Automotive Sensor Reference |
|---|---|
Use Scenario: Stabilizing 39 V rail in isolated auxiliary power supplies for PLC I/O modules. IC Role / Device Role / Timing Role: Zener diode providing fixed reference voltage for linear regulator feedback or overvoltage clamp. Use Value: Maintains ±2.5% regulation accuracy across -40 °C to +85 °C ambient with <0.2 μA leakage at 30 V. |
Use Scenario: Biasing and voltage limiting in 39 V-tolerant sensor signal conditioning circuits for engine control units. IC Role / Device Role / Timing Role: Overvoltage protector and reference element for analog front-end op-amp stages. Use Value: Survives 100 W transient surges per ISO 7637-2 Pulse 1/2b, preserving sensor integrity. |
| Test Equipment Calibration | Telecom Line Interface Protection |
Use Scenario: Precision voltage reference in handheld multimeter internal shunt calibration circuits. IC Role / Device Role / Timing Role: Stable 39 V reference source for ADC full-scale adjustment and offset trimming. Use Value: Low Zzt (85 Ω) minimizes loading error during calibration current injection. |
Use Scenario: Secondary surge clamp in 48 V telecom line interface cards protecting PHY ICs. IC Role / Device Role / Timing Role: Fast-response voltage limiter placed after primary gas discharge tube. Use Value: DO-34 package allows direct placement near connector with 5 mm pitch alignment to layout constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4763A | Zener voltage 39 V (37.05–40.95 V), Zzt = 90 Ω, DO-41 package (longer leads, larger footprint) | Higher thermal resistance due to larger DO-41 case; less suitable for compact 5 mm pitch layouts | Preferred where higher surge margin is needed but board space permits larger package |
| BZX55-C39 | Zener voltage 39 V (37.05–40.95 V), Zzt = 90 Ω, DO-35 glass package (Φ1.6 mm, shorter body) | Lower PRSM (50 W), narrower operating temperature range (-65 °C to +150 °C) | Selected when cost sensitivity outweighs surge robustness and extended Tj requirement |
Compared with RD39ES-AZ, 1N4763A offers higher surge margin but requires more PCB area, while BZX55-C39 reduces size and cost at the expense of thermal capability and transient energy handling-making RD39ES-AZ optimal for space-constrained industrial designs needing 175 °C junction rating and 100 W pulse resilience.
Availability
RD39ES-AZ is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive sensor reference, and telecom line interface protection requiring stable component supply, long-lifecycle support, and traceable DO-34 sourcing.
Supply support for RD39ES-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
Excel Semiconductor is a China-based analog semiconductor manufacturer specializing in discrete power devices, including Zener, TVS, and rectifier diodes for industrial and automotive markets.
The RD2.0ES–RD39ES series was designed to deliver E24-graded, glass-sealed Zener diodes with high surge resilience and wide temperature operation for cost-sensitive yet reliability-critical applications.
FAQ
What is the exact zener voltage tolerance of RD39ES-AZ?
The RD39ES-AZ has a zener voltage range of 36.63 V to 38.52 V at 5 mA test current, corresponding to ±2.5% tolerance about the nominal 39 V rating. This is confirmed in the Electrical Characteristics table on page 4 of Rev. 3e datasheet, with suffix "D" denoting the highest-grade bin for the RD39ES family.
Can RD39ES-AZ replace BZX55-C39 in existing designs?
RD39ES-AZ is not a drop-in replacement for BZX55-C39 due to differences in package dimensions (DO-34 vs. DO-35), thermal rating (175 °C vs. 150 °C), and surge capability (100 W vs. 50 W). While both regulate at ~39 V, RD39ES-AZ requires updated footprint and offers superior ruggedness-suitable for upgrade paths, not blind substitution.
What is the maximum reverse voltage RD39ES-AZ can withstand before breakdown?
The RD39ES-AZ begins controlled zener breakdown at its specified Vz range (36.63–38.52 V) under 5 mA current. Below this, reverse leakage remains ≤0.2 μA at 30 V. Sustained reverse voltage above 38.52 V will cause increasing current flow-designers must limit applied voltage or use series resistance to maintain safe operating limits per the Absolute Maximum Ratings table.
Is RD39ES-AZ suitable for surface-mount assembly?
No, RD39ES-AZ uses a through-hole DO-34 glass axial package with radial leads and is not compatible with reflow or wave soldering processes intended for SMD components. It requires manual or selective wave soldering with 5 mm pitch hole spacing, as specified in the Dimensions drawing on page 7 of the datasheet.
How does RD39ES-AZ perform under thermal stress?
RD39ES-AZ maintains specification compliance up to 175 °C junction temperature, with derated power dissipation following the curve in Figure 6. At 85 °C ambient, usable power drops to ~280 mW. Its DO-34 glass package provides better thermal stability than plastic equivalents, making RD39ES-AZ appropriate for enclosed industrial enclosures without forced cooling.
RD39ES-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:
- -
RD39ES-AZ FAQ
1.How can I place an order for RD39ES-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD39ES-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 RD39ES-AZ reliable?
The price and inventory of RD39ES-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD39ES-AZ is usually 5 days.
3.What payment methods are accepted for RD39ES-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD39ES-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD39ES-AZ?
RD39ES-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD39ES-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 RD39ES-AZ?
For technical support, including RD39ES-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD39ES-AZ requirements.
6.How does Aetrix verify that RD39ES-AZ is sourced from the original manufacturer or authorized distributors?
All RD39ES-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 RD39ES-AZ meets industry standards.
7.What is the process for return or replacement of RD39ES-AZ?
All RD39ES-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD39ES-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 RD39ES-AZ part is unused and in its original packaging.
Return procedure for RD39ES-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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