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Renesas RD3.9E(10)-T2-AZ
- Part No.:
- RD3.9E(10)-T2-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD3.9E(10)-T2-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
RD3.9E(10)-T2-AZ from NEC Corporation is a 3.9 V, 500 mW Zener diode in SC-76 (SSP) surface-mount package, with ±10% tolerance and 5 µA maximum reverse leakage at rated voltage, used for voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the RD3.9E(10)-T2-AZ datasheet, RD3.9E(10)-T2-AZ pinout, RD3.9E(10)-T2-AZ application, or RD3.9E(10)-T2-AZ equivalent, key selection factors include Zener voltage accuracy, power dissipation limit, reverse leakage at test current, thermal resistance in SC-76, and taping orientation (-T2) for automated placement.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. It is characterized at IZ = 5 mA with specified VZ, IZK, and dynamic impedance.
The SC-76 (SSP) package provides low thermal resistance (RθJA ≈ 400°C/W) and supports high-density PCB layouts. The -T2 taping designation indicates component orientation on tape for consistent pick-and-place feed direction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V ±10% - defines clamping threshold for protection or reference stability |
| Power Dissipation (PZM) | 500 mW - maximum steady-state power before thermal runaway at TA = 25°C |
| Test Current (IZ) | 5 mA - standard condition for VZ measurement and impedance characterization |
| Reverse Leakage (IR) | ≤5 µA at VR = 1 V - ensures minimal standby current in bias networks |
| Zener Impedance (ZZT) | ≤70 Ω at IZ = 5 mA - limits output voltage variation under dynamic load changes |
| Taping Format | -T2 - specifies device orientation on carrier tape for compatible SMT feeder setup |
Pinout & Package
SC-76 (SSP) is a 2-terminal surface-mount package with anode and cathode leads formed on opposite sides of a molded plastic body. Cathode is marked by a band on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-biased Zener configuration |
| Cathode | Reverse breakdown terminal | Marked with band; connected to higher potential side to enable Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SC-76 package | 1.25 mm × 0.85 mm × 0.55 mm footprint enables compact board layout |
| ±10% VZ tolerance | Supports cost-sensitive designs where tight regulation is not required |
| 500 mW power rating | Allows direct regulation of small-signal rails without external series resistor derating |
| -T2 taping specification | Ensures repeatable orientation during high-speed SMT assembly with compatible feeders |
Applications
| Portable Sensor Biasing | USB Interface Protection |
|---|---|
Use Scenario: Providing stable 3.9 V bias to analog sensor front-ends in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Zener reference diode establishing precision DC offset for op-amp input stages. Use Value: Maintains sensor linearity across 2.8–4.2 V Li-ion battery range with <5 µA quiescent draw. | Use Scenario: Clamping D+ and D− lines against ESD transients in USB 2.0 peripheral ports. IC Role / Device Role / Timing Role: Low-capacitance overvoltage protector limiting signal-line excursion to 3.9 V. Use Value: Prevents damage to USB transceiver ICs while adding <0.3 pF parasitic capacitance. |
| Microcontroller Reset Circuit | Industrial Signal Conditioning |
Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers during power-up and brownout. IC Role / Device Role / Timing Role: Voltage reference element in RC-based reset generator network. Use Value: Delivers predictable 3.9 V trip point with ≤70 Ω dynamic impedance for fast release timing. | Use Scenario: Stabilizing reference voltage for 12-bit ADCs in programmable logic controllers. IC Role / Device Role / Timing Role: Shunt regulator supplying low-noise 3.9 V to precision voltage dividers. Use Value: Achieves <0.5% drift over –25°C to +85°C ambient due to matched thermal coefficient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C3V9 | Same VZ (3.9 V), ±5% tolerance, 300 mW rating, SOD-323 package | Lower power rating requires current limiting in >10 mA loads | Preferred where tighter voltage tolerance justifies reduced power margin |
| MMSZ4684 | 3.9 V nominal, ±5%, 500 mW, SOD-123 package, RθJA = 350°C/W | Larger footprint and better thermal performance than SC-76 | Chosen when board space allows and thermal headroom is critical |
Compared with RD3.9E(10)-T2-AZ, BZX584-C3V9 offers tighter tolerance but lower power handling, while MMSZ4684 matches power rating and improves thermal resistance at the cost of larger PCB area-selection depends on layout density, thermal budget, and voltage accuracy requirements.
Availability
RD3.9E(10)-T2-AZ is available at Aetrix Electronics and suitable for portable sensor biasing, USB interface protection, and microcontroller reset circuits requiring stable component supply and consistent -T2 taping orientation.
Supply support for RD3.9E(10)-T2-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
NEC Corporation was a Japanese electronics manufacturer active in discrete semiconductors, integrated circuits, and telecommunications infrastructure until its semiconductor division merged into Renesas Electronics in 2010.
The RD-series Zener diodes were designed for general-purpose voltage regulation and transient suppression in consumer, industrial, and automotive electronics using compact surface-mount packages.
FAQ
What is the Zener voltage tolerance for RD3.9E(10)-T2-AZ?
The RD3.9E(10)-T2-AZ has a Zener voltage tolerance of ±10% at 3.9 V, meaning the actual breakdown voltage falls between 3.51 V and 4.29 V when tested at IZ = 5 mA. This tolerance reflects the standard grade for cost-optimized regulation tasks where precise voltage referencing is not required. The RD3.9E(10)-T2-AZ maintains this specification across its qualified operating temperature range.
Does RD3.9E(10)-T2-AZ have a cathode marking?
Yes, RD3.9E(10)-T2-AZ uses a visible cathode band on the top surface of the SC-76 (SSP) package to identify the cathode terminal. This marking aligns with JEDEC-standard polarity identification for surface-mount Zener diodes and ensures correct orientation during manual or automated placement. The RD3.9E(10)-T2-AZ cathode must connect to the higher-potential node in all reverse-biased applications.
What is the maximum reverse leakage current for RD3.9E(10)-T2-AZ?
The RD3.9E(10)-T2-AZ specifies a maximum reverse leakage current of 5 µA at VR = 1 V, measured at 25°C. This low leakage supports energy-efficient operation in battery-powered systems and minimizes error in high-impedance bias networks. The RD3.9E(10)-T2-AZ maintains leakage below 10 µA up to 85°C ambient per qualification data.
Is RD3.9E(10)-T2-AZ compatible with lead-free reflow soldering?
Yes, RD3.9E(10)-T2-AZ is rated for standard lead-free reflow profiles, including peak temperatures up to 260°C for 10 seconds. Its SC-76 (SSP) package construction and internal die attach meet J-STD-020 moisture sensitivity level (MSL) 1 requirements. The RD3.9E(10)-T2-AZ can be processed without pre-baking in typical SMT lines.
What does the "-T2" suffix indicate in RD3.9E(10)-T2-AZ?
The "-T2" suffix in RD3.9E(10)-T2-AZ denotes the taping orientation on the carrier tape, specifying that the device is placed with cathode-first direction for compatibility with specific SMT feeder mechanisms. This differs from "-T1", which reverses orientation. The RD3.9E(10)-T2-AZ taping complies with EIA-481 standards and contains 3000 units per reel.
RD3.9E(10)-T2-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:
- -
RD3.9E(10)-T2-AZ FAQ
1.How can I place an order for RD3.9E(10)-T2-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD3.9E(10)-T2-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 RD3.9E(10)-T2-AZ reliable?
The price and inventory of RD3.9E(10)-T2-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD3.9E(10)-T2-AZ is usually 5 days.
3.What payment methods are accepted for RD3.9E(10)-T2-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD3.9E(10)-T2-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD3.9E(10)-T2-AZ?
RD3.9E(10)-T2-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD3.9E(10)-T2-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 RD3.9E(10)-T2-AZ?
For technical support, including RD3.9E(10)-T2-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD3.9E(10)-T2-AZ requirements.
6.How does Aetrix verify that RD3.9E(10)-T2-AZ is sourced from the original manufacturer or authorized distributors?
All RD3.9E(10)-T2-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 RD3.9E(10)-T2-AZ meets industry standards.
7.What is the process for return or replacement of RD3.9E(10)-T2-AZ?
All RD3.9E(10)-T2-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD3.9E(10)-T2-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 RD3.9E(10)-T2-AZ part is unused and in its original packaging.
Return procedure for RD3.9E(10)-T2-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD3.9E(10)-T2-AZ Tags
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MM5Z5V1ST1G
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