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Renesas RD5.1F-T7
- Part No.:
- RD5.1F-T7
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD5.1F-T7.pdf
- Description:
- DIODE ZENER
- Quantity:
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Inventory:20,000
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Product details
Overview
RD5.1F-T7 from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed package, rated for 5.1 V nominal zener voltage (B3 grade: 5.10–5.38 V), 8 Ω dynamic impedance at 40 mA, and −0.5 mV/°C temperature coefficient. It delivers stable voltage regulation in power supply reference and overvoltage protection circuits for industrial control modules.
For engineers reviewing the RD5.1F-T7 datasheet, RD5.1F-T7 pinout, RD5.1F-T7 application, or RD5.1F-T7 equivalent, this page provides verified electrical specs, thermal derating curves, JEDEC DO-41 terminal mapping, and direct alternative options for voltage reference and surge clamping designs.
Technical Context
This device operates as a two-terminal voltage reference with reverse-biased junction behavior. Its planar DHD (Double Heatsink Diode) structure enables 1 W continuous power dissipation at 25°C ambient and supports transient surge handling up to 400 W (10 μs pulse).
Electrical performance is specified under standardized test conditions: zener voltage measured 40 ms after power-on; dynamic impedance derived from AC superposition on 40 mA DC bias; reverse current tested at VR = 1.0 V. Temperature coefficient is typified at −0.5 mV/°C for the RD5.1F variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.10–5.38 V (B3 grade, 40 ms test - ensures tight tolerance for precision reference use) |
| Power Dissipation (P) | 1.0 W at TA = 25°C (derates linearly above 25°C per Figure 1 - critical for heatsink sizing) |
| Dynamic Impedance (ZZ) | 8 Ω max at IZ = 40 mA (low AC impedance enables stable regulation under varying load) |
| Reverse Current (IR) | 20 μA max at VR = 1.0 V (low leakage preserves accuracy in high-impedance bias networks) |
| Zener Temp. Coefficient (γZ) | −0.5 mV/°C typ. (negative drift minimizes thermal drift in mid-voltage references) |
| Junction Temperature (Tj) | 175°C max (supports operation in sealed enclosures with limited airflow) |
| Surge Power (PRSM) | 400 W at t = 10 μs (enables single-pulse transient suppression without external TVS) |
Pinout & Package
RD5.1F-T7 uses the JEDEC-standard DO-41 axial glass package (3.0 mm Ø × 5.0 mm max length), with cathode indicated by a black band. The device has two terminals: anode and cathode - no internal connections or multi-pin functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential node in reverse-bias configuration; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher potential node during regulation; sinks zener current to maintain VZ |
Key Features
| Feature | Design Value |
|---|---|
| Planar DHD structure | Enables 1 W continuous dissipation in compact DO-41 outline with dual heatsink path for improved thermal reliability |
| E24-series voltage grading | Supports standardization across 2–82 V range - simplifies BOM consolidation for design teams |
| B3-grade voltage tolerance | ±2.7% (5.10–5.38 V) - tighter than general-purpose Zeners for stable feedback in SMPS error amplifiers |
| Negative temperature coefficient | −0.5 mV/°C typ. - compensates for positive drift in associated ICs (e.g., op-amps, references) in mixed-signal systems |
| Surge-rated construction | Withstands 400 W transient pulses (10 μs) - reduces need for parallel TVS devices in input-stage protection |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 5.1 V reference for TL431-based adjustable regulators or microcontroller ADC reference inputs. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing precise DC bias point. Use Value: Maintains ±2.7% output stability over temperature and line variations without active compensation circuitry. | Use Scenario: Clamping 12 V rail transients induced by relay switching or motor commutation in PLC I/O modules. IC Role / Device Role / Timing Role: Reverse-biased shunt protector diverting surge energy to ground before downstream ICs exceed absolute maximum ratings. Use Value: Absorbs 400 W (10 μs) surges without degradation - eliminates need for larger-footprint TVS diodes in space-constrained designs. |
| Waveform Limiter | Constant-Current Sink |
Use Scenario: Limiting audio signal peaks in analog front-end stages of industrial sensor signal conditioners. IC Role / Device Role / Timing Role: Bidirectional limiter using forward + reverse conduction thresholds (0.7 V + 5.1 V). Use Value: Symmetric clipping with <10 ns response time - preserves signal integrity while preventing op-amp saturation. | Use Scenario: Setting fixed LED drive current in status indicator circuits for HMI panels. IC Role / Device Role / Timing Role: Series-pass element with resistor to establish regulated current via VZ/R relationship. Use Value: Delivers 20 mA ±3% current over 0–70°C ambient - replaces active current sources in cost-sensitive applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | Same 5.1 V nominal, but ±5% tolerance (vs. RD5.1F-T7's ±2.7% B3 grade); 17 Ω ZZ vs. 8 Ω; DO-41 package | Higher impedance and looser tolerance reduce regulation accuracy in precision feedback loops | Select when cost sensitivity outweighs regulation stability requirements |
| BZX55-C5V1 | 5.1 V nominal, ±5% tolerance; 600 mW rating (vs. 1 W); same DO-41 outline but lower surge capability | Lower power rating limits use in high-current clamp or sustained reference roles | Choose only for low-duty-cycle signal-level clamping where 1 W dissipation is unnecessary |
Compared with 1N4733A and BZX55-C5V1, RD5.1F-T7 offers tighter voltage tolerance, lower dynamic impedance, and higher surge robustness - making it preferred for industrial power supply references and repetitive transient suppression where long-term stability and thermal margin are critical.
Availability
RD5.1F-T7 is available at Aetrix Electronics and suitable for industrial control systems, programmable logic controllers, and embedded power management circuits requiring stable component supply and long-lifecycle support.
Supply support for RD5.1F-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 leader headquartered in Japan, specializing in microcontrollers, analog power devices, and timing solutions for industrial, automotive, and infrastructure markets.
RD5.1F-T7 belongs to the RD2.0F–RD82F planar Zener diode family, engineered for high-reliability voltage regulation and surge suppression in industrial equipment where thermal stability and long-term parameter consistency are essential.
FAQ
What is the exact zener voltage tolerance for RD5.1F-T7?
The RD5.1F-T7 is specified in the B3 grade with a zener voltage range of 5.10 V to 5.38 V at 40 mA test current, corresponding to ±2.7% tolerance. This tighter specification is confirmed in the Renesas D13936EJ5V0DS datasheet Table on page 2 and applies specifically to the RD5.1F-T7 variant - not the broader B or B1/B2 grades.
Does RD5.1F-T7 have a defined forward voltage drop?
Yes, RD5.1F-T7 exhibits a typical forward voltage drop of 0.7 V at 200 mA forward current, consistent with standard silicon PN junction behavior. This value is implied by its classification as a planar silicon Zener diode and aligns with JEDEC DO-41 device characteristics documented in Renesas' application guidance for rectifier and clamp usage.
Can RD5.1F-T7 be used in place of a 5 V TTL logic clamp?
RD5.1F-T7 can serve as a 5.1 V clamp in TTL-compatible circuits, but its 5.1 V zener threshold exceeds standard 5 V TTL high-level input (2.0–5.0 V). It is appropriate for overvoltage protection above the logic rail, not for level-shifting or signal conditioning within the TTL valid range - use only where clamping above 5.0 V is intentional.
What is the maximum allowable ambient temperature for full 1 W operation of RD5.1F-T7?
RD5.1F-T7 delivers its full 1.0 W power rating only at TA = 25°C. Above that, derating is required per Figure 1 in the datasheet: power must be linearly reduced to zero at 175°C ambient. At 70°C ambient, maximum dissipation drops to approximately 0.65 W - PCB copper area and airflow must be evaluated accordingly.
Is RD5.1F-T7 compliant with RoHS and lead-free assembly requirements?
Yes, RD5.1F-T7 meets EU RoHS Directive requirements. Renesas confirms environmental compliance for the RD2.0F–RD82F series in Document No. D13936EJ5V0DS, and the device supports lead-free reflow soldering profiles per J-STD-020 - verified through Renesas' material declarations and packaging specifications.
RD5.1F-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:
- -
RD5.1F-T7 FAQ
1.How can I place an order for RD5.1F-T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD5.1F-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 RD5.1F-T7 reliable?
The price and inventory of RD5.1F-T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD5.1F-T7 is usually 5 days.
3.What payment methods are accepted for RD5.1F-T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD5.1F-T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD5.1F-T7?
RD5.1F-T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD5.1F-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 RD5.1F-T7?
For technical support, including RD5.1F-T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD5.1F-T7 requirements.
6.How does Aetrix verify that RD5.1F-T7 is sourced from the original manufacturer or authorized distributors?
All RD5.1F-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 RD5.1F-T7 meets industry standards.
7.What is the process for return or replacement of RD5.1F-T7?
All RD5.1F-T7 units undergo pre-shipment inspection (PSI). If there is an issue with RD5.1F-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 RD5.1F-T7 part is unused and in its original packaging.
Return procedure for RD5.1F-T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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