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Renesas RD39ES-T1-AZ
- Part No.:
- RD39ES-T1-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD39ES-T1-AZ.pdf
- Description:
- DIODE ZENER
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Product details
Overview
RD39ES-T1-AZ from Renesas Electronics is a 39 V, 400 mW DO-34 glass-sealed Zener diode with DHD (Double Heatsink Diode) construction, ±5% zener voltage tolerance at 5 mA test current, and 85 Ω dynamic impedance, used for precision voltage regulation in low-power analog circuits and surge protection in signal line interfaces.
For engineers reviewing the RD39ES-T1-AZ datasheet, RD39ES-T1-AZ pinout, RD39ES-T1-AZ application, or RD39ES-T1-AZ equivalent, this page delivers verified electrical specs, thermal performance data, JEDEC DO-34 package details, and real-world use cases in constant-voltage reference and transient suppression designs.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 39 V at IZ = 5 mA, exhibiting a temperature coefficient of +0.075 %/°C (≈+29.3 mV/°C) per Fig. 9. Its DHD construction enables dual thermal paths to the PCB leads, improving power handling beyond standard DO-34 devices.
The device supports non-repetitive surge reverse power up to 100 W for 10 µs pulses (Fig. 10), and its junction-to-ambient thermal resistance drops from 375 °C/W at t = 1 ms to ~100 °C/W at steady state on a 7 mm² PCB (Fig. 7), confirming effective heatsinking via lead termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 35.36–37.19 V at IZ = 5 mA - defines stable regulation window under nominal bias |
| Power Dissipation P | 400 mW at TA = 25°C - sets maximum continuous DC power in free-air operation |
| Dynamic Impedance ZZ | 85 Ω at IZ = 5 mA - determines output voltage variation under load current changes |
| Reverse Current IR | 0.2 µA at VR = 30 V - ensures minimal leakage below breakdown in standby circuits |
| Surge Power PRSM | 100 W (t = 10 µs) - enables clamping of fast transients without failure |
| Junction Temperature Tj | 175°C - allows operation in high-ambient industrial environments with proper derating |
| Package | DO-34 (JEDEC) - 2.4 mm max body length, 5 mm lead pitch, glass-sealed, axial-leaded |
Pinout & Package
RD39ES-T1-AZ uses a two-terminal axial DO-34 glass package. Cathode is marked by a black band near one lead end. No internal circuitry or polarity-sensitive terminals beyond anode/cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference node | Connected to lower-potential side in zener regulator; forms cathode-referenced voltage clamp |
| Cathode | Reverse breakdown terminal / Zener voltage reference node | Marked with black band; connected to higher-potential side; output voltage referenced to this node |
Key Features
| Feature | Design Value |
|---|---|
| DHD construction | Dual heatsink path through both axial leads reduces thermal resistance by ~25% vs. standard DO-34 |
| Planar process | Enables tight VZ tolerance (±5%) and stable long-term voltage drift (<1% over 1000 hrs) |
| DO-34 glass seal | Hermetic encapsulation ensures moisture resistance and reliability in humid environments |
| E24-standard VZ | 39 V value aligns with IEC 60063 E24 series, simplifying BOM consolidation across voltage grades |
| Short-pitch compatibility | 5 mm lead spacing supports dense PCB layouts without requiring bent leads or adapters |
Applications
| Reference Voltage Source | Signal Line Surge Protection |
|---|---|
Use Scenario: Providing stable 39 V reference for ADC biasing and op-amp feedback networks in industrial sensor signal conditioning modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed voltage node independent of supply variation. Use Value: Delivers <±0.5% regulation error over 0–5 mA load range due to low ZZ and tight VZ tolerance. | Use Scenario: Clamping ESD transients on RS-485 bus lines in factory automation gateways. IC Role / Device Role / Timing Role: Passive voltage clamp absorbing >1 kV HBM surges before IC-level protection activates. Use Value: Withstands 100 W/10 µs surges without degradation, preserving downstream transceiver integrity. |
| Constant-Current Bias Generator | Waveform Clipper Circuit |
Use Scenario: Setting bias current for discrete transistor amplifiers in audio preamp stages. IC Role / Device Role / Timing Role: Zener + series resistor forming precision current source via Ohm's law (I ≈ (VIN − VZ)/R). Use Value: Maintains ±3% current stability over −40°C to +85°C due to predictable TC and low ZZ. | Use Scenario: Limiting peak amplitude of AC-coupled audio signals to prevent amplifier saturation. IC Role / Device Role / Timing Role: Bidirectional clipping element (with series diode) constraining signal swing to ±39 V. Use Value: Sharp knee at 5 mA enables clean clipping onset with <100 ns response to fast edges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | Same 39 V nominal VZ, but 1 W rating in DO-41 package; 10 Ω higher ZZ (95 Ω) | Higher power handling suits larger-signal clamping; larger DO-41 footprint requires layout change | Select when >400 mW continuous dissipation or higher surge margin is required |
| BZX55-C39 | 39 V VZ, 500 mW rating in DO-35; ±5% tolerance; 70 Ω ZZ; RoHS-compliant glass passivation | Lower ZZ improves regulation; DO-35 has shorter body (2.0 mm) but same 5 mm pitch | Prefer for tighter regulation or RoHS-constrained designs; verify thermal derating on target PCB |
Compared with RD39ES-T1-AZ, 1N4739A offers higher surge capacity but requires PCB rework for DO-41, while BZX55-C39 provides better regulation and modern compliance at the cost of slightly reduced thermal robustness in high-ambient settings.
Availability
RD39ES-T1-AZ is available at Aetrix Electronics and suitable for industrial sensor interfaces, RS-485 protection circuits, and analog reference design requiring stable component supply with full traceability and lifecycle continuity.
Supply support for RD39ES-T1-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.
The RD2.0ES–RD39ES series was designed as a family of precision, low-power Zener diodes for voltage reference and transient suppression in space-constrained, cost-sensitive applications using legacy DO-34 footprints.
FAQ
What is the exact zener voltage range for RD39ES-T1-AZ at 5 mA?
The RD39ES-T1-AZ has a guaranteed zener voltage range of 35.36 V to 37.19 V when tested at IZ = 5 mA and TA = 25°C, per the "AB2" suffix specification in the Renesas D13935EJ7V0DS datasheet. This ±5% tolerance ensures predictable regulation in production designs without binning.
Does RD39ES-T1-AZ support surface-mount assembly?
No, RD39ES-T1-AZ is an axial-leaded DO-34 glass package and is not compatible with SMT reflow processes. It requires through-hole insertion and wave or selective soldering. For SMT equivalents, consider the BZX55-C39 (DO-35) or MMBZ5240B (SOD-123), though these differ in thermal and electrical performance.
What is the maximum allowable reverse current for RD39ES-T1-AZ below breakdown?
At VR = 30 V and TA = 25°C, the RD39ES-T1-AZ exhibits a maximum reverse current IR of 0.2 µA. This ultra-low leakage ensures minimal power loss and signal distortion in high-impedance reference or bias networks where current draw must be sub-microamp.
How does the DHD construction improve thermal performance of RD39ES-T1-AZ?
The DHD (Double Heatsink Diode) construction in RD39ES-T1-AZ provides two parallel thermal conduction paths-from the silicon die to both axial leads-reducing effective junction-to-ambient thermal resistance. This allows sustained 400 mW dissipation with less temperature rise than conventional DO-34 diodes, especially on small PCB pads.
Can RD39ES-T1-AZ be used in automotive applications?
RD39ES-T1-AZ is rated as a "Standard" quality grade device per Renesas documentation and is intended for computers, office equipment, and industrial robots-not automotive systems. For AEC-Q200 qualified Zener diodes, consider alternatives like the BZX84-C39 or SMAZ39, which undergo stress testing for vibration, temperature cycling, and humidity resistance.
RD39ES-T1-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-T1-AZ FAQ
1.How can I place an order for RD39ES-T1-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD39ES-T1-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-T1-AZ reliable?
The price and inventory of RD39ES-T1-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-T1-AZ is usually 5 days.
3.What payment methods are accepted for RD39ES-T1-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD39ES-T1-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD39ES-T1-AZ?
RD39ES-T1-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD39ES-T1-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-T1-AZ?
For technical support, including RD39ES-T1-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD39ES-T1-AZ requirements.
6.How does Aetrix verify that RD39ES-T1-AZ is sourced from the original manufacturer or authorized distributors?
All RD39ES-T1-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-T1-AZ meets industry standards.
7.What is the process for return or replacement of RD39ES-T1-AZ?
All RD39ES-T1-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD39ES-T1-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-T1-AZ part is unused and in its original packaging.
Return procedure for RD39ES-T1-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD39ES-T1-AZ Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZT52C15S-7-F
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MM5Z5V1ST1G
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