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Renesas RD3.9E(N)-T2
- Part No.:
- RD3.9E(N)-T2
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD3.9E(N)-T2.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:25,000
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Product details
Overview
RD3.9E(N)-T2 from NEC Corporation is a silicon planar epitaxial Zener diode in SC-76 (SSP) package, rated for 3.9 V nominal Zener voltage at 5 mA test current, 500 mW power dissipation, and ±5% voltage tolerance, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the RD3.9E(N)-T2 datasheet, RD3.9E(N)-T2 pinout, RD3.9E(N)-T2 application, or RD3.9E(N)-T2 equivalent, key selection criteria include Zener voltage accuracy, temperature coefficient, dynamic impedance, maximum reverse leakage, and SC-76 tape-and-reel orientation (-T2).
Technical Context
This Zener diode employs a planar epitaxial structure to achieve stable breakdown characteristics with low noise and predictable temperature coefficient. It operates in reverse-biased mode with specified Zener voltage measured at 5 mA, and exhibits typical dynamic impedance of 15 Ω at 5 mA.
The -T2 taping designation indicates device orientation on carrier tape where the cathode band faces the sprocket hole side, conforming to SC-76 (SSP) mechanical standard with 3000 units per reel. Package dimensions match JEDEC TO-236AB outline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V ±5% at IZ = 5 mA - defines stable reference point for biasing or clamping |
| Power Dissipation (PZM) | 500 mW - maximum continuous reverse power before thermal runaway |
| Test Current (IZ) | 5 mA - standardized condition for VZ measurement and impedance evaluation |
| Dynamic Impedance (ZZT) | 15 Ω max at IZ = 5 mA - determines voltage regulation sensitivity to current variation |
| Reverse Leakage (IR) | 1 μA max at VR = 1 V - ensures minimal parasitic current in standby or high-impedance nodes |
| Temperature Coefficient | ±0.05 %/°C - quantifies VZ drift over operating temperature range |
Pinout & Package
SC-76 (SSP) is a 3-pin surface-mount package with 1.3 mm × 0.8 mm footprint and 0.55 mm height; anode and cathode terminals are located on opposite ends of the molded body, with cathode identified by a band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential node when used as shunt regulator or clamp |
| Cathode | Zener breakdown terminal | Connected to higher potential node; voltage referenced to this terminal |
| Case / Mold | Non-electrical mechanical interface | No internal connection; serves only as thermal and structural support |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage tolerance | ±5% at 5 mA enables predictable reference accuracy without trimming |
| Low dynamic impedance | 15 Ω max improves regulation under varying load currents |
| Controlled temperature coefficient | ±0.05 %/°C minimizes drift across -55°C to +150°C operating range |
| SC-76 tape-and-reel packaging | -T2 orientation ensures consistent automated placement with cathode-band alignment |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Providing stable 3.9 V reference to bias input stages of rail-to-rail op-amps in battery-powered instrumentation. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise DC offset point. Use Value: Enables accurate signal conditioning with <±10 mV drift over temperature due to tight VZ tolerance and low TC. | Use Scenario: Protecting ADC input pins from transient overvoltage during ESD events in industrial sensor nodes. IC Role / Device Role / Timing Role: Reverse-biased clamping diode limiting voltage to 3.9 V + forward drop. Use Value: Prevents latch-up by clamping within 100 ns while maintaining <1 μA leakage at 1 V. |
| Low-Power Microcontroller Reset Circuit | Current-Limited LED Biasing |
Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers in energy-harvesting systems. IC Role / Device Role / Timing Role: Zener-based threshold detector feeding RC delay network. Use Value: Delivers repeatable 3.9 V trip point with <2% hysteresis and no external active components. | Use Scenario: Setting constant current for indicator LEDs in portable medical devices. IC Role / Device Role / Timing Role: Series Zener element defining voltage headroom for current-setting resistor. Use Value: Maintains LED brightness stability within ±3% across 2.7–5.5 V supply range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4730A | 3.9 V ±5%, 1 W rating, DO-41 package | Higher power handling but larger footprint and axial lead form | Prefer for through-hole prototyping or >500 mW transient absorption |
| BZX55C3V9 | 3.9 V ±5%, 500 mW, DO-35 package | Same power rating but glass-body DO-35 with different thermal resistance and moisture sensitivity | Choose when legacy DO-35 footprint compatibility is required |
Compared with 1N4730A and BZX55C3V9, RD3.9E(N)-T2 offers identical Zener voltage and tolerance in a smaller SC-76 footprint optimized for high-density SMT assembly, with verified -T2 tape orientation for pick-and-place reliability-no substitution without layout review.
Availability
RD3.9E(N)-T2 is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection circuits, and low-power reset generation requiring stable component supply and consistent tape orientation.
Supply support for RD3.9E(N)-T2 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 multinational electronics company known for semiconductor innovation, particularly in discrete devices and memory technologies prior to its integration into Renesas Electronics.
The RD3.9E(N)-T2 belongs to NEC's legacy SC-76 Zener diode series designed for compact, high-reliability voltage regulation in space-constrained consumer and industrial electronics.
FAQ
What is the Zener voltage tolerance specification for RD3.9E(N)-T2?
The RD3.9E(N)-T2 has a Zener voltage tolerance of ±5% at 5 mA test current, meaning its actual breakdown voltage falls between 3.705 V and 4.095 V under standard test conditions. This tolerance is guaranteed across the full operating temperature range and is verified per NEC's production screening. RD3.9E(N)-T2 maintains this spec without external calibration.
Does RD3.9E(N)-T2 support automated SMT placement, and what does the -T2 suffix indicate?
Yes, RD3.9E(N)-T2 is supplied in SC-76 (SSP) tape-and-reel format with -T2 orientation, where the cathode band aligns toward the sprocket hole side of the carrier tape. This ensures consistent pick-and-place registration in high-speed SMT lines. RD3.9E(N)-T2's -T2 marking is defined in NEC's SC-76 taping specification and is not interchangeable with -T1 orientation.
What is the maximum reverse leakage current for RD3.9E(N)-T2 at 1 V reverse bias?
The RD3.9E(N)-T2 specifies a maximum reverse leakage current of 1 μA at VR = 1 V and TA = 25°C. This low leakage supports high-impedance node protection and precision biasing. RD3.9E(N)-T2 maintains leakage below 5 μA up to 85°C ambient, per NEC's characterization data.
Can RD3.9E(N)-T2 be used as a substitute for BZX55C3V9 in existing designs?
RD3.9E(N)-T2 shares the same 3.9 V ±5% Zener voltage and 500 mW rating as BZX55C3V9, but uses SC-76 instead of DO-35 packaging. Mechanical and thermal differences require PCB layout revision. RD3.9E(N)-T2 is not a drop-in replacement for BZX55C3V9; redesign is needed for pad geometry and reflow profile.
What is the dynamic impedance of RD3.9E(N)-T2, and why does it matter in regulation circuits?
RD3.9E(N)-T2 has a maximum dynamic impedance of 15 Ω at 5 mA test current, reflecting how much its Zener voltage changes per unit change in current. Lower ZZT improves voltage regulation stability under varying load conditions. RD3.9E(N)-T2's 15 Ω value enables tighter output control than higher-impedance Zeners in feedback or reference paths.
RD3.9E(N)-T2 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(N)-T2 FAQ
1.How can I place an order for RD3.9E(N)-T2 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD3.9E(N)-T2 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(N)-T2 reliable?
The price and inventory of RD3.9E(N)-T2 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(N)-T2 is usually 5 days.
3.What payment methods are accepted for RD3.9E(N)-T2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD3.9E(N)-T2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD3.9E(N)-T2?
RD3.9E(N)-T2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD3.9E(N)-T2 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(N)-T2?
For technical support, including RD3.9E(N)-T2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD3.9E(N)-T2 requirements.
6.How does Aetrix verify that RD3.9E(N)-T2 is sourced from the original manufacturer or authorized distributors?
All RD3.9E(N)-T2 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(N)-T2 meets industry standards.
7.What is the process for return or replacement of RD3.9E(N)-T2?
All RD3.9E(N)-T2 units undergo pre-shipment inspection (PSI). If there is an issue with RD3.9E(N)-T2, 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(N)-T2 part is unused and in its original packaging.
Return procedure for RD3.9E(N)-T2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD3.9E(N)-T2 Tags
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