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Renesas RD39E-TB
- Part No.:
- RD39E-TB
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD39E-TB.pdf
- Description:
- DIODE ZENER 39V
- Quantity:
- Payment:
- Shipping:
Inventory:30,000
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Product details
Overview
RD39E-TB from NEC Corporation is a silicon planar epitaxial Zener diode in SC-76 (SSP) package, rated for 39 V nominal Zener voltage at 5 mA test current, with 5% tolerance and 0.5 W power dissipation, commonly used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the RD39E-TB datasheet, RD39E-TB pinout, RD39E-TB application, or RD39E-TB equivalent, key selection criteria include Zener voltage accuracy, temperature coefficient, dynamic impedance, maximum reverse leakage, and taping configuration (-TB denotes tape-and-reel packaging per SC-76 standard).
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and supply conditions. It features a silicon planar epitaxial construction ensuring consistent breakdown characteristics and low noise performance.
The SC-76 (SSP) surface-mount package supports automated placement and reflow soldering, with standardized taping orientation (-TB) enabling compatibility with pick-and-place feeders. Device polarity is marked by a cathode band on the package body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V ±5% at IZ = 5 mA - defines precise DC reference level for feedback or bias networks |
| Power Dissipation (PZ) | 0.5 W - limits continuous reverse power handling without thermal runaway |
| Zener Impedance (ZZT) | 120 Ω max at IZ = 1 mA - determines voltage regulation stiffness under small-signal variations |
| Reverse Leakage (IR) | 1 μA max at VR = 29.4 V - ensures minimal error current in high-impedance reference paths |
| Temperature Coefficient | +0.08 %/°C typical - quantifies drift of VZ over operating temperature range |
| Package | SC-76 (SSP) - 2-pin surface-mount outline with 1.3 mm × 0.8 mm footprint and 0.55 mm height |
Pinout & Package
SC-76 (SSP) is a 2-terminal surface-mount package with anode and cathode leads formed as gull-wing extensions. Cathode is identified by a visible band on the package top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower potential side in shunt regulator configuration |
| Cathode | Zener breakdown terminal / Output reference node | Provides stabilized voltage output when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage with tight 5% tolerance | Enables accurate voltage referencing without post-calibration in cost-sensitive designs |
| Low dynamic impedance (≤120 Ω) | Maintains regulation stability under moderate load transients in sensor biasing applications |
| SC-76 (SSP) package compatibility | Supports high-density PCB layouts and automated SMT assembly with JEDEC-standard footprint |
| 1 μA max reverse leakage at 75% VZ | Minimizes quiescent current draw in battery-powered voltage monitor circuits |
Applications
| Power Supply Reference | Sensor Biasing Circuit |
|---|---|
Use Scenario: Providing stable 39 V reference for op-amp feedback in linear regulator ICs. IC Role / Device Role / Timing Role: Shunt voltage reference element maintaining setpoint accuracy against line/load variation. Use Value: Delivers ±5% initial accuracy and <±0.1%/°C drift, reducing need for trimming resistors. | Use Scenario: Biasing bridge-based pressure sensors requiring precise excitation voltage. IC Role / Device Role / Timing Role: Fixed-voltage source establishing known sensor operating point independent of supply ripple. Use Value: Low 1 μA leakage avoids loading high-impedance sensor outputs at 39 V level. |
| Overvoltage Clamp | ADC Input Protection |
Use Scenario: Clamping transient surges on 36 V industrial control bus lines. IC Role / Device Role / Timing Role: Fast-acting crowbar device limiting voltage to safe margin above nominal rail. Use Value: 0.5 W rating sustains short-duration 40 V spikes without degradation. | Use Scenario: Protecting 3.3 V microcontroller ADC inputs from accidental 39 V miswiring. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as input clamp to limit voltage excursion. Use Value: 120 Ω Zener impedance ensures rapid clamping response before damage threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55-C39 (ON Semiconductor) | Same 39 V ±5%, but in DO-35 glass package; higher ZZT (150 Ω), higher IR (5 μA at 29.4 V) | Through-hole mounting only; unsuitable for high-density SMT layouts | Select when legacy through-hole assembly or higher surge energy handling is required |
| MMSZ4702T1G (ON Semiconductor) | 39 V ±5%, SC-70 package; lower PZ (350 mW), ZZT = 100 Ω, IR = 0.1 μA at 29.4 V | Lower power rating limits use in sustained clamp applications | Select when ultra-low leakage and space-constrained layout outweigh power needs |
Compared with BZX55-C39 and MMSZ4702T1G, RD39E-TB offers balanced trade-offs: SC-76 footprint for SMT compatibility, 0.5 W dissipation for robust clamping, and 1 μA leakage suitable for precision biasing-making it optimal for mixed-signal industrial modules where size, power, and accuracy intersect.
Availability
RD39E-TB is available at Aetrix Electronics and suitable for industrial power monitoring, sensor interface design, and embedded voltage reference applications requiring stable component supply and consistent tape-and-reel delivery.
Supply support for RD39E-TB 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
NEC Corporation was a Japanese electronics manufacturer active in discrete semiconductors, integrated circuits, and communications systems until its semiconductor division merged into Renesas Electronics in 2010.
The RD39E-TB belongs to NEC's legacy Zener diode family designed for general-purpose voltage regulation and protection in consumer, industrial, and automotive electronics prior to the Renesas consolidation.
FAQ
What is the Zener voltage tolerance of RD39E-TB?
The RD39E-TB has a nominal Zener voltage of 39 V with a tolerance of ±5%, measured at 5 mA test current. This tolerance is specified in NEC's original datasheet and verified across production lots. The RD39E-TB maintains this accuracy under standard operating conditions from −55°C to +150°C ambient temperature.
Does RD39E-TB support automated SMT assembly?
Yes, RD39E-TB uses the SC-76 (SSP) surface-mount package with standardized dimensions (1.3 mm × 0.8 mm) and gull-wing leads compatible with industry-standard pick-and-place equipment and reflow profiles. The -TB suffix confirms tape-and-reel packaging per JEDEC J-STD-020, enabling direct feeder integration for RD39E-TB placement.
What is the maximum reverse leakage current for RD39E-TB?
RD39E-TB specifies a maximum reverse leakage current of 1 μA at 29.4 V (75% of nominal Zener voltage). This value is critical for low-power reference and protection circuits where leakage-induced error must be minimized. The RD39E-TB achieves this performance due to its planar epitaxial silicon structure and controlled doping profile.
Is RD39E-TB suitable for overvoltage protection in 36 V systems?
Yes, RD39E-TB is commonly used as a shunt clamp in 36 V industrial bus systems. Its 39 V Zener voltage provides a 3 V safety margin above nominal rail, and its 0.5 W power rating allows it to absorb transient energy without failure. RD39E-TB's 120 Ω dynamic impedance ensures fast response during voltage spikes.
How does RD39E-TB differ from RD39E-T1 or RD39E-T2?
RD39E-TB, RD39E-T1, and RD39E-T2 share identical electrical specifications and SC-76 package, differing only in taping orientation: -TB denotes standard tape direction per NEC's SC-76 specification, while -T1 and -T2 indicate alternate carrier tape feeding directions. RD39E-TB is optimized for compatibility with most SMT feeders without orientation adjustment.
RD39E-TB 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:
- -
RD39E-TB FAQ
1.How can I place an order for RD39E-TB through Aetrix?
Please submit a Request for Quotation (RFQ) for RD39E-TB 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 RD39E-TB reliable?
The price and inventory of RD39E-TB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD39E-TB is usually 5 days.
3.What payment methods are accepted for RD39E-TB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD39E-TB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD39E-TB?
RD39E-TB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD39E-TB 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 RD39E-TB?
For technical support, including RD39E-TB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD39E-TB requirements.
6.How does Aetrix verify that RD39E-TB is sourced from the original manufacturer or authorized distributors?
All RD39E-TB 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 RD39E-TB meets industry standards.
7.What is the process for return or replacement of RD39E-TB?
All RD39E-TB units undergo pre-shipment inspection (PSI). If there is an issue with RD39E-TB, 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 RD39E-TB part is unused and in its original packaging.
Return procedure for RD39E-TB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD39E-TB Tags
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