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Renesas RD5.1F-T8-AZ
- Part No.:
- RD5.1F-T8-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD5.1F-T8-AZ.pdf
- Description:
- DIODE ZENER
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Inventory:46,500
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Product details
Overview
RD5.1F-T8-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode with nominal zener voltage of 5.1 V (B3 grade: 5.10–5.38 V), dynamic impedance ≤8 Ω at 40 mA, and temperature coefficient of −0.5 mV/°C. It features DO-41 glass-sealed DHD (Double Heatsink Diode) packaging, rated for 175°C junction temperature, and is used in precision voltage reference and surge absorption circuits in industrial power supplies.
For engineers reviewing the RD5.1F-T8-AZ datasheet, RD5.1F-T8-AZ pinout, RD5.1F-T8-AZ application, or RD5.1F-T8-AZ equivalent, this page delivers verified electrical specs, thermal behavior, JEDEC DO-41 terminal mapping, real-world clipping/limiting use cases, and two validated alternative Zener diodes with documented voltage tolerance and impedance differences.
Technical Context
This device operates as a reverse-biased voltage-regulating element with tightly controlled zener breakdown at 5.1 V under 40 mA test current. Its planar construction ensures stable long-term voltage regulation and low dynamic impedance, critical for noise-sensitive analog references.
The DO-41 package provides dual heatsink capability via axial leads and glass passivation, enabling reliable 1 W continuous dissipation up to 175°C junction temperature. Its negative temperature coefficient (−0.5 mV/°C) supports compensation in mixed-technology bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.10–5.38 V at IZ = 40 mA - defines precise clamping threshold for overvoltage protection and reference stability |
| Dynamic Impedance (ZZ) | ≤8 Ω at IZ = 40 mA - ensures minimal voltage deviation under load transients in feedback loops |
| Power Dissipation (P) | 1.0 W at TA = 25°C - sets maximum steady-state thermal load without heatsinking |
| Junction Temperature (Tj) | −65 to +175°C - enables operation in harsh industrial environments including motor drives and power converters |
| Reverse Current (IR) | ≤20 μA at VR = 2.0 V - guarantees low leakage in high-impedance bias networks |
| Temperature Coefficient (γZ) | −0.5 mV/°C - allows predictable drift compensation when paired with positive-TC components |
| Surge Power (PRSM) | 400 W for t = 10 μs - absorbs short-duration ESD or inductive kick events without failure |
Pinout & Package
RD5.1F-T8-AZ uses the JEDEC-standard DO-41 axial glass package (3.0 mm Ø × 5.0 mm L), with cathode indicated by a black band. The dual heatsink structure improves thermal resistance to ambient (RthJA ≈ 150°C/W on 5 mm² copper pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to ground or lower-potential node in shunt regulator configurations |
| Cathode | Zener breakdown terminal / high-side connection | Connected to input rail or signal line requiring clamping; black band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range (2–82 V) | Enables single-family standardization across diverse supply rails and reference needs |
| E24 series nominal values | Ensures compatibility with standard resistor and capacitor value planning in analog designs |
| DO-41 glass-sealed DHD structure | Provides mechanical robustness and hermetic reliability for industrial-grade long-life operation |
| Negative γZ at 5.1 V | Permits temperature-compensated reference design when combined with forward-biased diodes |
| 1 W continuous rating with 400 W surge capability | Supports both steady-state regulation and transient suppression in compact power stages |
Applications
| Voltage Reference Circuit | Waveform Clipper Circuit |
|---|---|
Use Scenario: Stable 5.1 V reference for ADC biasing and op-amp level-shifting in programmable logic controllers. IC Role / Device Role / Timing Role: Shunt voltage reference providing low-drift, low-noise DC offset independent of supply variation. Use Value: Maintains ±1% output accuracy over −40°C to +125°C ambient due to tight VZ tolerance and low ZZ. |
Use Scenario: Clipping audio signal peaks in analog mixer front-ends to prevent amplifier saturation. IC Role / Device Role / Timing Role: Bidirectional limiter using two anti-parallel RD5.1F-T8-AZ diodes to constrain signal swing to ±5.1 V. Use Value: Achieves clean hard-clipping with <8 Ω dynamic impedance, minimizing harmonic distortion at clipping threshold. |
| Surge Absorption Circuit | Constant-Current Bias Network |
Use Scenario: Protecting RS-485 transceiver inputs from induced lightning surges in factory automation cabling. IC Role / Device Role / Timing Role: Primary shunt clamp absorbing fast transients before they reach sensitive IC pins. Use Value: Withstands 400 W/10 μs surge pulses while maintaining post-surge VZ stability per JEDEC DO-41 thermal limits. |
Use Scenario: Setting fixed emitter current in discrete BJT amplifiers for temperature-stable gain control. IC Role / Device Role / Timing Role: Zener-based current source where RD5.1F-T8-AZ establishes base-emitter voltage drop. Use Value: Delivers <20 μA leakage at 2 V reverse bias, ensuring minimal error in microamp-level bias currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | 5.1 V nominal (±5%), ZZ ≤ 17 Ω at 49 mA, DO-41, −0.5 mV/°C γZ | Higher ZZ increases regulation error under load; wider tolerance reduces precision in reference use | Acceptable for non-critical clamping where cost is prioritized over regulation accuracy |
| BZX55-C5V1 | 5.1 V nominal (±5%), ZZ ≤ 60 Ω at 5 mA, DO-35, −2 mV/°C γZ | Lower power rating (500 mW), higher impedance, and less stable TC limit use in 1 W thermal environments | Suitable only for low-power signal-level limiting; not recommended for power rail clamping or reference duties |
Compared with RD5.1F-T8-AZ, the 1N4733A offers broader availability but sacrifices dynamic regulation performance, while the BZX55-C5V1 lacks both power handling and impedance performance required for industrial-grade 1 W applications-making RD5.1F-T8-AZ the preferred choice for precision, thermally demanding roles.
Availability
RD5.1F-T8-AZ is available at Aetrix Electronics and suitable for industrial power supplies, factory automation interfaces, and embedded sensor signal conditioning requiring stable component supply and long-lifecycle support.
Supply support for RD5.1F-T8-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
Renesas Electronics Corporation is a global semiconductor leader formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices for industrial and automotive markets.
RD5.1F-T8-AZ belongs to Renesas' legacy planar Zener diode family designed for high-reliability voltage regulation and transient suppression in standard-grade industrial equipment-including PLCs, motor drives, and instrumentation.
FAQ
What is the exact zener voltage tolerance for RD5.1F-T8-AZ?
The RD5.1F-T8-AZ is specified as B3 grade per the Renesas datasheet D13936EJ5V0DS, with a zener voltage range of 5.10 V to 5.38 V at 40 mA test current. This ±2.7% tolerance reflects tighter binning than standard B-grade parts and is confirmed in Table 1 of the official document. RD5.1F-T8-AZ maintains this specification across its full operating temperature range.
Does RD5.1F-T8-AZ have a defined cathode marking, and how is it identified?
Yes, RD5.1F-T8-AZ uses a black band on the glass body to indicate the cathode terminal, consistent with JEDEC DO-41 standards. This marking is visible along the axial package and corresponds to the terminal that connects to the higher-potential side in zener operation. The datasheet's Package Drawing (page 2) explicitly confirms black as the cathode indication color for RD5.1F-T8-AZ.
What is the maximum allowable surge reverse power for RD5.1F-T8-AZ, and under what conditions?
RD5.1F-T8-AZ supports a surge reverse power (PRSM) of 400 W for pulse width t = 10 μs at TA = 25°C, as stated in the Absolute Maximum Ratings table (page 2). This rating assumes non-repetitive operation and is validated by Figure 7 in the datasheet. Exceeding this limit risks irreversible junction damage even if average power remains within 1 W.
How does the temperature coefficient of RD5.1F-T8-AZ affect its performance in precision references?
RD5.1F-T8-AZ has a zener voltage temperature coefficient (γZ) of −0.5 mV/°C, meaning its breakdown voltage decreases by 0.5 mV per degree Celsius rise. In precision references, this enables predictable drift compensation-for example, pairing with a forward-biased diode (positive TC) to achieve near-zero net drift. RD5.1F-T8-AZ's low-magnitude γZ makes it especially suitable for mid-range voltage references where stability outweighs absolute zero-TC requirements.
Is RD5.1F-T8-AZ compliant with RoHS and lead-free assembly requirements?
Yes, RD5.1F-T8-AZ meets EU RoHS Directive requirements for restricted substances, as confirmed by Renesas' environmental compliance documentation. The device uses lead-free glass encapsulation and tin-plated axial leads compatible with standard reflow and wave soldering profiles. No exemptions apply, and RD5.1F-T8-AZ is rated for lead-free assembly per J-STD-020 moisture sensitivity level (MSL) 1.
RD5.1F-T8-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:
- -
RD5.1F-T8-AZ FAQ
1.How can I place an order for RD5.1F-T8-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD5.1F-T8-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 RD5.1F-T8-AZ reliable?
The price and inventory of RD5.1F-T8-AZ 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-T8-AZ is usually 5 days.
3.What payment methods are accepted for RD5.1F-T8-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD5.1F-T8-AZ transactions.
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4.How is shipping managed for RD5.1F-T8-AZ?
RD5.1F-T8-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD5.1F-T8-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 RD5.1F-T8-AZ?
For technical support, including RD5.1F-T8-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD5.1F-T8-AZ requirements.
6.How does Aetrix verify that RD5.1F-T8-AZ is sourced from the original manufacturer or authorized distributors?
All RD5.1F-T8-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 RD5.1F-T8-AZ meets industry standards.
7.What is the process for return or replacement of RD5.1F-T8-AZ?
All RD5.1F-T8-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD5.1F-T8-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 RD5.1F-T8-AZ part is unused and in its original packaging.
Return procedure for RD5.1F-T8-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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