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Renesas RD39JS-T1-AZ
- Part No.:
- RD39JS-T1-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD39JS-T1-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:18,000
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Product details
Overview
RD39JS-T1-AZ from Renesas Electronics is a 39 V, 400 mW glass-encapsulated Zener diode in DO-34 package, featuring sharp breakdown characteristics, low noise (≤50 µV at 10–500 kHz), and ±5% zener voltage tolerance at 5 mA test current. It operates with 0.1 µA maximum reverse leakage at 30 V and supports constant-voltage regulation in low-power analog reference circuits.
For engineers reviewing the RD39JS-T1-AZ datasheet, RD39JS-T1-AZ pinout, RD39JS-T1-AZ application, or RD39JS-T1-AZ equivalent, this device serves as a precision voltage reference in power supply feedback loops, overvoltage protection clamps, and waveform shaping circuits where stable 39 V regulation and low dynamic impedance (Zz = 120 Ω typical) are required.
Technical Context
This Zener diode employs Double Heatsink Diode (DHD) construction for improved thermal dissipation in the miniature DO-34 glass package (2.4 mm max body length). Its sharp knee characteristic ensures stable regulation onset at precisely defined breakdown voltage, with dynamic impedance measured at 5 mA DC bias plus small-signal AC perturbation.
The device exhibits a positive temperature coefficient of +0.08 %/°C at 39 V, enabling predictable drift behavior in ambient-temperature-varying applications. Its surge capability supports 2.4 W non-repetitive reverse power pulses (t = 10 µs), making it suitable for transient suppression in low-energy signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 37.04–40.99 V at Iz = 5 mA - defines precise regulation point with ±5% tolerance per E24 standard. |
| Power Dissipation (P) | 400 mW at TA = 25 °C - sets maximum continuous DC power handling before thermal derating applies. |
| Dynamic Impedance (Zz) | 120 Ω typical at Iz = 5 mA - determines output voltage stability under load current variation. |
| Reverse Leakage (IR) | 0.1 µA max at VR = 30 V - ensures minimal quiescent current in high-impedance bias networks. |
| Noise Level (en) | ≤50 µV RMS (10–500 kHz) - critical for low-noise reference and sensor excitation applications. |
| Surge Power (PRSM) | 2.4 W (t = 10 µs) - enables brief overvoltage clamping without failure during transient events. |
| Junction Temperature (Tj) | 175 °C max - defines upper thermal limit for reliable long-term operation. |
Pinout & Package
RD39JS-T1-AZ uses a DO-34 glass-sealed axial package with cathode indicated by a blue band. The device has two terminals: anode and cathode. No internal circuitry or multi-pin configuration exists - it is a two-terminal passive voltage-reference device.
| 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 blue band; connected to higher-potential node to enable reverse-bias regulation at 39 V. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise operation | ≤50 µV RMS noise (10–500 kHz) enables use in precision analog references without added filtering. |
| Sharp breakdown knee | Defined transition from blocking to conduction at Vz minimizes regulation uncertainty in feedback loops. |
| DHD construction | Double Heatsink Diode design improves thermal resistance to ambient, supporting stable 400 mW operation. |
| E24-standard voltage | Vz aligned to E24 series (39 V nominal) ensures compatibility with industry-standard BOM planning and sourcing. |
| DO-34 glass package | Hermetically sealed, JEDEC-compliant axial package offers moisture resistance and long-term parameter stability. |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Circuit |
|---|---|
|
Use Scenario: Stabilizing output voltage in linear regulators or switching converter feedback networks. IC Role / Device Role / Timing Role: Provides precise 39 V reference to error amplifier input for closed-loop regulation. Use Value: Enables ±1% output accuracy with minimal temperature-induced drift due to known +0.08 %/°C coefficient. |
Use Scenario: Limiting voltage spikes on microcontroller I/O lines or sensor inputs. IC Role / Device Role / Timing Role: Acts as shunt clamp, conducting excess energy when line voltage exceeds 39 V. Use Value: Prevents damage from transients up to 2.4 W (10 µs) without requiring active control circuitry. |
| Waveform Clipping | Analog Signal Level Shifting |
|
Use Scenario: Hard-limiting audio or instrumentation signals to prevent amplifier saturation. IC Role / Device Role / Timing Role: Biased in reverse to clip positive peaks at 39 V and forward to clip negative peaks at ~0.7 V. Use Value: Delivers symmetrical clipping thresholds with low dynamic impedance for consistent distortion profile. |
Use Scenario: Biasing op-amp inputs or level-shifting sensor outputs in industrial monitoring systems. IC Role / Device Role / Timing Role: Supplies stable 39 V DC offset to shift AC-coupled signals into ADC input range. Use Value: Maintains accuracy across temperature via low noise and predictable TC, reducing calibration burden. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4763A-T | 39 V, 1 W, DO-41 package, Zz = 90 Ω, IR = 1 µA at 31.2 V | Higher power rating but larger footprint; less suitable for space-constrained PCBs | Select when >400 mW continuous dissipation or higher surge margin is required. |
| BZX55-C39 | 39 V, 500 mW, DO-35 package, Zz = 100 Ω, IR = 0.1 µA at 30 V | Plastic DO-35 vs. glass DO-34; slightly better leakage but lower thermal reliability | Prefer for cost-sensitive consumer designs where hermetic sealing is not mandatory. |
Compared with RD39JS-T1-AZ, the 1N4763A-T offers higher power and lower impedance but requires layout changes due to DO-41 size, while the BZX55-C39 matches voltage and leakage closely but trades glass-seal reliability for plastic-package cost savings.
Availability
RD39JS-T1-AZ is available at Aetrix Electronics and suitable for power supply feedback references, overvoltage clamp circuits, and waveform clipping applications requiring stable component supply and long-term parametric consistency.
Supply support for RD39JS-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 global semiconductor leader delivering microcontrollers, analog, power, and timing solutions for industrial, automotive, and consumer systems.
The RD39JS-T1-AZ belongs to the RDxJS series of low-noise Zener diodes designed specifically for precision voltage reference and signal conditioning in standard-grade industrial and commercial equipment.
FAQ
What is the exact zener voltage range for RD39JS-T1-AZ at 5 mA test current?
The RD39JS-T1-AZ has a guaranteed zener voltage range of 37.04 V to 40.99 V when tested at Iz = 5 mA, corresponding to ±5% tolerance around the nominal 39 V rating per E24 standard. This range is verified per Renesas datasheet D13937EJ5V0DS00 and applies to all units shipped under this part number.
Does RD39JS-T1-AZ have a specified junction-to-ambient thermal resistance?
Yes - RD39JS-T1-AZ exhibits a thermal resistance of 375 °C/W (typical) from junction to ambient on a standard 3 mm × 3 mm copper pad (0.035 mm thick), as shown in Figure 7 of the official datasheet. This value decreases with larger PCB copper area, enabling safe 400 mW operation within derated ambient temperature limits.
Can RD39JS-T1-AZ be used in place of a 39 V Zener in a feedback divider for a DC-DC controller?
Yes - RD39JS-T1-AZ is routinely applied in feedback networks for isolated flyback and forward converters. Its sharp knee and low dynamic impedance (120 Ω) ensure accurate regulation; however, designers must verify that the controller's feedback pin bias current remains below 0.1 µA to avoid voltage error from leakage.
Is RD39JS-T1-AZ RoHS compliant and lead-free?
Yes - RD39JS-T1-AZ meets EU RoHS Directive requirements and is manufactured as a lead-free device. Renesas confirms compliance in environmental documentation, and the DO-34 glass package contains no restricted substances above threshold limits per Annex II of Directive 2011/65/EU.
What is the maximum allowable reverse voltage before breakdown for RD39JS-T1-AZ?
The RD39JS-T1-AZ begins controlled breakdown at its specified zener voltage (37.04–40.99 V); below this, reverse leakage remains ≤0.1 µA up to VR = 30 V. Applying voltage between 30 V and Vz risks uncontrolled conduction - therefore, 30 V is the practical maximum non-breakdown reverse voltage for safe biasing.
RD39JS-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:
- -
RD39JS-T1-AZ FAQ
1.How can I place an order for RD39JS-T1-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD39JS-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 RD39JS-T1-AZ reliable?
The price and inventory of RD39JS-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 RD39JS-T1-AZ is usually 5 days.
3.What payment methods are accepted for RD39JS-T1-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD39JS-T1-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD39JS-T1-AZ?
RD39JS-T1-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD39JS-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 RD39JS-T1-AZ?
For technical support, including RD39JS-T1-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD39JS-T1-AZ requirements.
6.How does Aetrix verify that RD39JS-T1-AZ is sourced from the original manufacturer or authorized distributors?
All RD39JS-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 RD39JS-T1-AZ meets industry standards.
7.What is the process for return or replacement of RD39JS-T1-AZ?
All RD39JS-T1-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD39JS-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 RD39JS-T1-AZ part is unused and in its original packaging.
Return procedure for RD39JS-T1-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD39JS-T1-AZ Tags
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