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Renesas RD5.1F-T7-AZ
- Part No.:
- RD5.1F-T7-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD5.1F-T7-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:24,000
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Product details
Overview
RD5.1F-T7-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode with a nominal zener voltage of 5.1 V (B3 grade: 5.10–5.38 V), dynamic impedance of 8 Ω at 40 mA, and temperature coefficient of −0.5 mV/°C - designed for precision voltage regulation and surge absorption in power supply feedback loops and I/O protection circuits.
For engineers reviewing the RD5.1F-T7-AZ datasheet, RD5.1F-T7-AZ pinout, RD5.1F-T7-AZ application, or RD5.1F-T7-AZ equivalent, key selection criteria include its DO-41 package compatibility, 1 W steady-state dissipation, low dynamic impedance, tight B3 voltage tolerance, and suitability for constant-voltage reference and transient clamping in industrial control and consumer power supplies.
Technical Context
This device operates as a two-terminal voltage-reference component using planar junction technology in a glass-sealed DO-41 package. Its zener breakdown mechanism provides stable reverse conduction above 5.1 V with minimal voltage drift over temperature due to its negative temperature coefficient.
It supports continuous DC operation up to 1 W at 25°C ambient, with derating per Figure 1, and handles 400 W surge reverse power for 10 μs pulses. The device is rated for junction temperatures up to 175°C and storage from −65°C to +175°C.
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 max at IZ = 40 mA - ensures minimal output voltage variation under load current changes. |
| Power Dissipation (P) | 1.0 W at TA = 25°C - sets maximum continuous thermal load without heatsinking. |
| Reverse Current (IR) | 20 μA max at VR = 2.0 V - guarantees low leakage in standby or high-impedance bias networks. |
| Temp. Coefficient (γZ) | −0.5 mV/°C typical - enables predictable voltage drift compensation in temperature-sensitive references. |
| Surge Reverse Power | 400 W for t = 10 μs - provides robust transient suppression against ESD and inductive spikes. |
| Junction Temperature | 175°C max - determines maximum allowable internal operating temperature under thermal stress. |
Pinout & Package
RD5.1F-T7-AZ uses the JEDEC-standard DO-41 axial-leaded glass package (3.0 mm diameter × 5.0 mm length), with cathode indicated by a black band. It is a two-terminal device: anode and cathode only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit ground or lower-potential rail; forms return path during forward bias or zener regulation. |
| Cathode | Zener breakdown terminal / regulated output node | Connected to voltage source or signal line requiring clamping; maintains stable ~5.1 V relative to anode when reverse-biased above VZ. |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range (2–82 V) with E24 standardization | Enables single-source inventory consolidation across multiple voltage rails in multi-rail systems. |
| B3-grade voltage tolerance (±2.7% at 5.1 V) | Delivers tighter regulation than general-purpose Zeners, reducing need for post-regulation trimming. |
| Planar-type glass-sealed DHD structure | Improves thermal reliability and long-term stability vs. alloy-junction diodes in cyclic thermal environments. |
| 175°C maximum junction temperature rating | Supports operation in high-ambient industrial enclosures without forced cooling or derating penalties. |
| DO-41 package compatibility | Ensures drop-in replacement capability and compatibility with legacy through-hole PCB footprints and assembly processes. |
Applications
| Power Supply Feedback Regulation | I/O Line Surge Protection |
|---|---|
Use Scenario: Stabilizing output voltage in linear regulators or optocoupler-based SMPS feedback paths. IC Role / Device Role / Timing Role: Zener reference element providing fixed 5.1 V threshold to error amplifier input. Use Value: Maintains ±1% output accuracy over line/load/temperature with no external components beyond series resistor. |
Use Scenario: Protecting microcontroller GPIO pins from ESD and inductive transients on industrial sensor interfaces. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor clamping fast-rising spikes to safe levels. Use Value: Limits pin voltage to ≤5.4 V during 400 W/10 μs surges, preventing latch-up or oxide damage. |
| Constant-Current Bias Source | Waveform Clipping Circuit |
Use Scenario: Generating stable bias current for LED drivers or op-amp input stages. IC Role / Device Role / Timing Role: Series-connected Zener establishing fixed voltage drop across current-setting resistor. Use Value: Delivers <1% current variation across 0–70°C ambient due to low γZ and stable ZZ. |
Use Scenario: Limiting audio signal peaks in analog preamplifier inputs to prevent distortion. IC Role / Device Role / Timing Role: Shunt limiter conducting above ±5.1 V to clip symmetrical AC waveforms. Use Value: Provides sharp, repeatable clipping threshold with <5 ns response time and no recovery overshoot. |
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-AZ's ±2.7%), higher ZZ (17 Ω), and −2 mV/°C γZ. | Less suitable for precision references; acceptable for basic clamping where cost is primary. | Select 1N4733A only if B3-grade tolerance and low-TC performance are not required. |
| BZX55-C5V1 | 5.1 V nominal, ±5% tolerance, ZZ = 60 Ω, γZ = −2 mV/°C, DO-35 package (smaller, lower PD = 500 mW). | Limited to low-power signal-level clamping; cannot replace RD5.1F-T7-AZ in 1 W power applications. | Choose BZX55-C5V1 only for space-constrained, sub-500 mW designs where thermal margin is sufficient. |
Compared with 1N4733A and BZX55-C5V1, RD5.1F-T7-AZ offers superior voltage accuracy, lower dynamic impedance, and higher power handling - making it the preferred choice for industrial-grade voltage references and robust transient suppression where stability and reliability are critical.
Availability
RD5.1F-T7-AZ is available at Aetrix Electronics and suitable for industrial power supplies, embedded sensor interfaces, and consumer appliance control boards requiring stable component supply and long-lifecycle support.
Supply support for RD5.1F-T7-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 specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
RD5.1F-T7-AZ belongs to Renesas' legacy planar Zener diode family, engineered for high-reliability voltage regulation and transient suppression in standard-grade industrial and consumer applications.
FAQ
What is the exact zener voltage tolerance for RD5.1F-T7-AZ?
The RD5.1F-T7-AZ is specified as a B3-grade device with a zener voltage range of 5.10 V to 5.38 V at 40 mA test current - representing a ±2.7% tolerance around the nominal 5.1 V value. This tighter tolerance is confirmed in the Electrical Characteristics table of Renesas document D13936EJ5V0DS and distinguishes it from broader-tolerance alternatives like the 1N4733A.
Does RD5.1F-T7-AZ have a documented surge rating?
Yes, RD5.1F-T7-AZ has a specified surge reverse power rating of 400 W for a 10 μs pulse width at 25°C ambient, as shown in Figure 7 of the official Renesas datasheet D13936EJ5V0DS. This rating validates its use in transient suppression applications such as I/O line protection and switch-mode power supply snubbing.
Is RD5.1F-T7-AZ compatible with standard DO-41 footprints?
Yes, RD5.1F-T7-AZ uses the JEDEC-standard DO-41 package with 3.0 mm diameter and 5.0 mm body length, matching mechanical dimensions and lead spacing of industry-standard DO-41 Zener diodes. Its cathode marking is a black band, consistent with DO-41 polarity conventions.
What is the maximum junction temperature for RD5.1F-T7-AZ?
The absolute maximum junction temperature for RD5.1F-T7-AZ is 175°C, as stated in the Absolute Maximum Ratings table of Renesas datasheet D13936EJ5V0DS. This allows reliable operation in high-ambient environments such as enclosed industrial controllers or power converters without active cooling.
How does the temperature coefficient of RD5.1F-T7-AZ affect its performance?
RD5.1F-T7-AZ has a typical zener voltage temperature coefficient (γZ) of −0.5 mV/°C, meaning its regulated voltage decreases by approximately 0.5 mV per degree Celsius rise in junction temperature. This low, predictable drift supports stable reference performance in temperature-varying applications without additional compensation circuitry.
RD5.1F-T7-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-T7-AZ FAQ
1.How can I place an order for RD5.1F-T7-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD5.1F-T7-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-T7-AZ reliable?
The price and inventory of RD5.1F-T7-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-T7-AZ is usually 5 days.
3.What payment methods are accepted for RD5.1F-T7-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD5.1F-T7-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD5.1F-T7-AZ?
RD5.1F-T7-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD5.1F-T7-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-T7-AZ?
For technical support, including RD5.1F-T7-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD5.1F-T7-AZ requirements.
6.How does Aetrix verify that RD5.1F-T7-AZ is sourced from the original manufacturer or authorized distributors?
All RD5.1F-T7-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-T7-AZ meets industry standards.
7.What is the process for return or replacement of RD5.1F-T7-AZ?
All RD5.1F-T7-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD5.1F-T7-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-T7-AZ part is unused and in its original packaging.
Return procedure for RD5.1F-T7-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD5.1F-T7-AZ Tags
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