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Renesas RD47F-T7
- Part No.:
- RD47F-T7
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD47F-T7.pdf
- Description:
- DIODE ZENER
- Quantity:
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Inventory:5,000
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Product details
Overview
RD47F-T7 from Renesas Electronics is a 1 W planar-type silicon Zener diode with a nominal zener voltage of 47 V (B grade: 44–49 V), dynamic impedance of 50 Ω at 10 mA, and temperature coefficient of +36 mV/°C. It features a DO-41 glass-sealed DHD (Double Heatsink Diode) package and is rated for surge reverse power up to 400 W (t = 10 μs). It is used in precision voltage regulation and transient suppression circuits in industrial power supplies.
For engineers reviewing the RD47F-T7 datasheet, RD47F-T7 pinout, RD47F-T7 application, or RD47F-T7 equivalent, key selection criteria include its 47 V zener tolerance band, 50 Ω dynamic impedance at 10 mA test current, +36 mV/°C temperature coefficient, DO-41 mechanical compatibility, and 1 W steady-state power dissipation capability under defined thermal conditions.
Technical Context
The RD47F-T7 operates as a two-terminal voltage reference device relying on controlled avalanche breakdown in its planar silicon junction. Its zener voltage is specified at IZ = 10 mA with ±5% tolerance (44–49 V), and its positive temperature coefficient (+36 mV/°C) indicates increasing VZ with rising junction temperature - typical for higher-voltage Zeners above ~5.6 V.
It uses a glass-passivated DO-41 package with axial leads and black cathode marking, supporting mounting on PCBs or chassis with heatsinking via lead conduction. Thermal resistance is dependent on PCB copper area; Rth drops from ~240 °C/W (no copper) to ~80 °C/W (20 mm² foil) per Figure 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 44–49 V at IZ = 10 mA - defines stable regulation range for mid-range DC rail clamping. |
| Dynamic Impedance (ZZ) | 50 Ω max at IZ = 10 mA - determines output voltage variation under load current changes. |
| Power Dissipation (P) | 1.0 W at TA = 25°C - sets maximum continuous DC power before thermal derating applies. |
| Surge Reverse Power (PRSM) | 400 W for t = 10 μs - enables single-pulse transient suppression without failure. |
| Zener Temp. Coefficient (γZ) | +36 mV/°C typical - quantifies VZ drift over temperature; requires compensation in precision references. |
| Reverse Current (IR) | 5 μA max at VR = 36 V - ensures low leakage below knee voltage in standby circuits. |
| Junction Temperature (Tj) | 175°C max - constrains maximum allowable junction rise above ambient in thermal design. |
Pinout & Package
RD47F-T7 uses a DO-41 axial-leaded glass package (JEDEC standard), with cathode identified by a black band. Leads are tinned copper-clad steel, suitable for wave or hand soldering. Mechanical dimensions: Ø3.0 mm max body diameter, 25 mm min lead length, 5 mm max overall length beyond body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lower potential; carries forward current up to 200 mA. |
| Cathode | Zener breakdown terminal / regulated output node | Connected to voltage rail being clamped; sinks reverse current during regulation or surge events. |
Key Features
| Feature | Design Value |
|---|---|
| 1 W Planar Zener Structure | Enables stable, repeatable breakdown with low noise and predictable ZZ vs. IZ behavior. |
| E24 Series Voltage Selection | Supports standardized BOM consolidation across 2–82 V range using common E24 resistor-like spacing. |
| DO-41 Glass-Sealed DHD Package | Provides robust hermeticity, high surge capability, and proven reliability in industrial environments. |
| +36 mV/°C Temp. Coefficient | Allows predictable VZ tracking in warm ambient conditions; avoids negative drift seen in low-VZ devices. |
| B Grade Voltage Tolerance | 44–49 V band supports cost-effective selection without requiring tighter (and more expensive) B1/B2/B3 bins. |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing +48 V intermediate bus in telecom power modules where input ripple and load transients require tight voltage hold-up. IC Role / Device Role / Timing Role: Two-terminal shunt regulator maintaining constant voltage across load by sinking excess current when rail exceeds 47 V. Use Value: Delivers 1 W continuous dissipation with <50 Ω dynamic impedance, enabling <±0.5 V regulation error under 10 mA load step changes. |
Use Scenario: Clamping induced surges on 48 V CAN bus lines exposed to automotive load-dump transients. IC Role / Device Role / Timing Role: Passive voltage clamp absorbing short-duration energy spikes before they reach downstream transceivers. Use Value: Withstands 400 W surge (10 μs) without degradation, protecting 48 V interface ICs while maintaining <100 ns response time. |
| Test Equipment Reference Source | LED Driver Current Sense Clamp |
Use Scenario: Providing stable 47 V reference for calibration circuits in portable multimeters and benchtop DMMs. IC Role / Device Role / Timing Role: Precision voltage reference node in feedback divider networks for ADC reference scaling. Use Value: +36 mV/°C tempco allows predictable correction in firmware; 5 μA leakage at 36 V minimizes offset error in high-impedance dividers. |
Use Scenario: Limiting peak voltage across current-sense resistors in constant-current LED drivers operating from 48 V input. IC Role / Device Role / Timing Role: Shunt limiter preventing sense-resistor overvoltage during MOSFET switching transitions. Use Value: 50 Ω ZZ ensures minimal voltage overshoot (<0.5 V) during 1 A current steps, preserving sense accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4752A (ON Semiconductor) | 47 V nominal, ±5%, ZZ = 17 Ω @ 13 mA, DO-41, 1 W - lower ZZ but different test current. | Suitable for lower-impedance regulation; not drop-in due to differing IZ condition and tighter tolerance. | Select when lower dynamic impedance is critical and test current can be adjusted to 13 mA. |
| BZX85C47 (Nexperia) | 47 V nominal, ±5%, ZZ = 70 Ω @ 5 mA, DO-41, 1.3 W - higher power rating but higher ZZ at lower IZ. | Better for higher-power surge handling; less precise regulation at 10 mA due to higher ZZ. | Choose when thermal margin is constrained and 1.3 W rating improves long-term reliability at elevated ambient. |
Compared with RD47F-T7, the 1N4752A offers lower dynamic impedance but requires re-biasing to 13 mA for spec compliance, while the BZX85C47 provides higher power headroom at the cost of reduced regulation precision at 10 mA - making RD47F-T7 optimal for 47 V stabilization where 50 Ω ZZ and +36 mV/°C tempco are design-critical.
Availability
RD47F-T7 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and test equipment reference designs requiring stable component supply and long-lifecycle support.
Supply support for RD47F-T7 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 manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and discrete power components.
The RD47F-T7 belongs to Renesas' legacy planar Zener diode family designed for general-purpose voltage regulation and transient suppression in Standard-grade industrial applications.
FAQ
What is the exact zener voltage range for RD47F-T7?
The RD47F-T7 has a guaranteed zener voltage range of 44 V to 49 V at a test current of 10 mA, corresponding to its B-grade classification per the Renesas D13936EJ5V0DS datasheet. This 5 V window reflects the industry-standard ±5% tolerance for 47 V Zeners and is verified under 40 ms pulse testing after power-on.
Does RD47F-T7 have a specified surge rating?
Yes, RD47F-T7 is rated for a surge reverse power of 400 W at a pulse width of 10 μs, as confirmed in the Absolute Maximum Ratings table of the official datasheet. This rating applies under non-repetitive conditions at TA = 25°C and is validated per Figure 7 in the same document.
What is the thermal resistance of RD47F-T7 in a typical PCB layout?
The thermal resistance of RD47F-T7 depends on PCB copper area: it ranges from approximately 240 °C/W with no copper pour to ~80 °C/W with a 20 mm² copper foil (thickness 0.035 mm), per Figure 2 in the datasheet. No fixed Rth is given for a "standard" layout - design must reference this curve for actual board-level thermal modeling.
Is RD47F-T7 RoHS compliant?
RD47F-T7 complies with the EU RoHS Directive, as confirmed by Renesas' environmental compliance documentation and product markings. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and is suitable for use in consumer and industrial electronics requiring RoHS conformance.
Can RD47F-T7 be used in automotive applications?
RD47F-T7 is classified as a "Standard" quality grade device per Renesas' quality grading system and is intended for computers, office equipment, industrial robots, and communications gear - not for automotive safety-critical systems. It lacks AEC-Q200 qualification and is not recommended for under-hood or safety-related automotive use without explicit Renesas written consent.
RD47F-T7 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:
- -
RD47F-T7 FAQ
1.How can I place an order for RD47F-T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD47F-T7 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 RD47F-T7 reliable?
The price and inventory of RD47F-T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD47F-T7 is usually 5 days.
3.What payment methods are accepted for RD47F-T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD47F-T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD47F-T7?
RD47F-T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD47F-T7 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 RD47F-T7?
For technical support, including RD47F-T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD47F-T7 requirements.
6.How does Aetrix verify that RD47F-T7 is sourced from the original manufacturer or authorized distributors?
All RD47F-T7 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 RD47F-T7 meets industry standards.
7.What is the process for return or replacement of RD47F-T7?
All RD47F-T7 units undergo pre-shipment inspection (PSI). If there is an issue with RD47F-T7, 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 RD47F-T7 part is unused and in its original packaging.
Return procedure for RD47F-T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD47F-T7 Tags
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