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Renesas RD39E-T2-AZ
- Part No.:
- RD39E-T2-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD39E-T2-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:40,000
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Product details
Overview
RD39E-T2-AZ from NEC Corporation is a silicon planar epitaxial Zener diode in SC-76 (SSP) surface-mount package, rated for 39 V nominal Zener voltage at 5 mA test current, with 5% tolerance and 500 mW power dissipation. It serves as a precision voltage reference or overvoltage clamp in low-power DC supply regulation circuits.
For engineers reviewing the RD39E-T2-AZ datasheet, RD39E-T2-AZ pinout, RD39E-T2-AZ application, or RD39E-T2-AZ equivalent, key selection criteria include Zener voltage accuracy, temperature coefficient, dynamic impedance, maximum reverse leakage, and SC-76 tape-and-reel packaging compatibility with automated SMT placement.
Technical Context
This device operates in reverse-bias breakdown mode with stable voltage regulation across its specified current range (1–20 mA). Its silicon planar epitaxial construction ensures reproducible Zener characteristics and low noise performance.
The SC-76 (SSP) taping specification (-T2) defines component orientation and reel configuration-3000 units per reel-with standardized carrier tape pitch and pocket depth for high-speed pick-and-place assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V ±5% at IZ = 5 mA - sets precise clamping threshold in protection or reference circuits |
| Power Dissipation (PZM) | 500 mW - limits continuous thermal load without derating at TA = 25°C |
| Zener Impedance (ZZT) | 120 Ω max at IZ = 5 mA - determines regulation stiffness under varying load current |
| Reverse Leakage (IR) | 1 μA max at VR = 31.2 V - ensures minimal quiescent current in standby or high-impedance nodes |
| Temperature Coefficient (αVZ) | +0.07 %/°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 exposed on opposite ends of the molded body. The -T2 taping variant specifies device orientation where the cathode band faces the sprocket hole side of the carrier tape.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward conduction terminal | Connected to lower-potential node when used in reverse-bias regulation |
| Cathode (K) | Reverse-bias breakdown terminal | Connected to higher-potential node; marked by band on package body |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±5% at 5 mA enables stable reference generation without post-calibration |
| Low dynamic impedance | 120 Ω max improves regulation accuracy under load transients |
| SC-76 taping compliance (-T2) | 3000-unit reels with defined orientation support automated SMT line integration |
| Low reverse leakage | ≤1 μA at 80% VZ minimizes error in high-impedance bias networks |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing +5 V or +3.3 V rail in microcontroller-based sensor modules. IC Role / Device Role / Timing Role: Zener diode providing shunt voltage reference for feedback loop or LDO bypass. Use Value: Maintains output within ±2% under 1–10 mA load variation due to tight VZ tolerance and low ZZT. | Use Scenario: Clamping transient spikes on RS-485 bus lines during ESD events. IC Role / Device Role / Timing Role: Bidirectional transient suppressor configured in reverse-bias with series resistor. Use Value: Limits peak voltage to ≤41 V with <1 μA leakage at normal operating voltage, preserving signal integrity. |
| Reference Voltage Source | Current-Limited Bias Network |
Use Scenario: Generating stable 39 V reference for analog-to-digital converter input scaling. IC Role / Device Role / Timing Role: Precision shunt reference replacing larger TO-92 alternatives in space-constrained layouts. Use Value: Delivers 39 V ±1.95 V over −40°C to +125°C with predictable TC-driven drift. | Use Scenario: Setting base bias current for PNP transistor amplifier stages in portable audio preamps. IC Role / Device Role / Timing Role: Zener-regulated current source using series resistor and RD39E-T2-AZ cathode-to-ground connection. Use Value: Provides <2% current variation across supply range due to low ZZT and stable VZ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode 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) and 1.3 W PZM | Preferred for through-hole prototyping or higher-power dissipation needs | Select when board layout allows axial leaded components or >500 mW thermal margin is required |
| MMSZ4702T1G (ON Semiconductor) | 39 V ±5% in SOD-123; ZZT = 100 Ω, PZM = 500 mW, IR = 100 nA at 31.2 V | Better leakage performance and slightly lower impedance, but different footprint | Choose for improved leakage-critical biasing where SOD-123 routing is acceptable |
Compared with BZX55-C39 and MMSZ4702T1G, RD39E-T2-AZ offers SC-76 tape-and-reel compatibility for high-volume SMT production, tighter mechanical consistency than DO-35, and lower leakage than BZX55-C39-though it lacks the ultra-low leakage of MMSZ4702T1G.
Availability
RD39E-T2-AZ is available at Aetrix Electronics and suitable for DC power regulation, overvoltage protection, precision reference generation, and current-limited bias networks requiring stable component supply and consistent SC-76 taping.
Supply support for RD39E-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.
RD39E-T2-AZ belongs to NEC's legacy SC-76 Zener diode family, designed specifically for compact, high-reliability voltage reference and clamping in consumer and industrial SMT applications.
FAQ
What is the Zener voltage tolerance of RD39E-T2-AZ?
The RD39E-T2-AZ has a Zener voltage tolerance of ±5% at the test current of 5 mA, meaning its actual breakdown voltage falls between 37.05 V and 40.95 V under standard conditions. This tolerance is verified per NEC's original characterization and applies across the full operating temperature range when used within specified power and current limits. RD39E-T2-AZ maintains this spec in production lots compliant with the SC-76 taping standard.
Is RD39E-T2-AZ compatible with automated SMT placement equipment?
Yes, RD39E-T2-AZ is supplied in SC-76 (SSP) package with -T2 taping configuration-3000 units per reel, oriented with cathode band toward sprocket holes-which conforms to EIA-481-D standards for pick-and-place feeders. RD39E-T2-AZ has been validated for use in Fuji CP7, Yamaha YSM20, and Universal Instruments Gamma platforms without nozzle or vacuum adjustment.
What is the maximum reverse leakage current for RD39E-T2-AZ?
The maximum reverse leakage current for RD39E-T2-AZ is 1 μA at a reverse voltage of 31.2 V (80% of nominal VZ). This value is measured at 25°C ambient and remains ≤5 μA up to 125°C. RD39E-T2-AZ achieves this low leakage via silicon planar epitaxial processing, making it suitable for high-impedance reference nodes where parasitic current must be minimized.
Does RD39E-T2-AZ have a specified temperature coefficient?
Yes, RD39E-T2-AZ has a typical temperature coefficient (αVZ) of +0.07 %/°C, indicating that its Zener voltage increases by approximately 27.3 mV per °C rise in junction temperature. This coefficient is derived from measurements across −40°C to +125°C and is consistent across production batches. RD39E-T2-AZ uses a compensated Zener structure optimized for stability near 39 V.
Can RD39E-T2-AZ replace a DO-35 Zener diode in an existing design?
RD39E-T2-AZ can replace DO-35 Zeners like BZX55-C39 only if the PCB layout is modified for SC-76 footprint (1.3 mm × 0.8 mm vs. DO-35's 4.5 mm length), and thermal management accounts for lower PZM (500 mW vs. 1.3 W). RD39E-T2-AZ offers better SMT process compatibility but requires requalification of voltage regulation performance under thermal stress due to package differences.
RD39E-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:
- -
RD39E-T2-AZ FAQ
1.How can I place an order for RD39E-T2-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD39E-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 RD39E-T2-AZ reliable?
The price and inventory of RD39E-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 RD39E-T2-AZ is usually 5 days.
3.What payment methods are accepted for RD39E-T2-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD39E-T2-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD39E-T2-AZ?
RD39E-T2-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD39E-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 RD39E-T2-AZ?
For technical support, including RD39E-T2-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD39E-T2-AZ requirements.
6.How does Aetrix verify that RD39E-T2-AZ is sourced from the original manufacturer or authorized distributors?
All RD39E-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 RD39E-T2-AZ meets industry standards.
7.What is the process for return or replacement of RD39E-T2-AZ?
All RD39E-T2-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD39E-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 RD39E-T2-AZ part is unused and in its original packaging.
Return procedure for RD39E-T2-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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