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Renesas RD56F-T7-AZ
- Part No.:
- RD56F-T7-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD56F-T7-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
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Inventory:2,500
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Product details
Overview
RD56F-T7-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode with a nominal zener voltage of 56 V (B grade, 53–60 V range), dynamic impedance of 50 Ω at 10 mA, and temperature coefficient of +43 mV/°C. It features a DO-41 glass-sealed DHD (Double Heatsink Diode) package and is used for precision voltage regulation and surge absorption in industrial power supplies and analog reference circuits.
For engineers reviewing the RD56F-T7-AZ datasheet, RD56F-T7-AZ pinout, RD56F-T7-AZ application, or RD56F-T7-AZ equivalent, this page provides verified electrical specifications, thermal derating curves, zener voltage tolerance bands (B grade), junction temperature limits, and real-world use cases in overvoltage protection and constant-current biasing.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its planar construction ensures consistent breakdown characteristics and low leakage, while the DO-41 glass package supports reliable heat dissipation up to 175°C junction temperature.
The device exhibits a positive temperature coefficient (+43 mV/°C) above ~50 V, enabling predictable drift compensation in temperature-sensitive references. Its 400 W surge reverse power rating (t = 10 μs) allows transient suppression without degradation when used with appropriate series current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 53–60 V at IZ = 10 mA - defines clamping threshold for overvoltage protection and reference stability. |
| Power Dissipation (P) | 1.0 W at TA = 25°C - sets maximum continuous DC power handling before thermal derating applies. |
| Dynamic Impedance (ZZ) | 50 Ω max at IZ = 10 mA - determines output voltage variation under changing load current. |
| Junction Temperature (Tj) | −65 to +175°C - defines operational envelope for reliability in industrial ambient environments. |
| Surge Reverse Power (PRSM) | 400 W (t = 10 μs) - enables single-pulse transient suppression without failure. |
| Reverse Current (IR) | 5 μA max at VR = 43 V - ensures minimal leakage in high-impedance bias networks. |
| Temperature Coefficient (γZ) | +43 mV/°C typical - quantifies voltage drift per degree Celsius for thermal design margining. |
Pinout & Package
RD56F-T7-AZ uses a DO-41 axial-leaded glass package (JEDEC standard), with cathode indicated by a black band. The device has two terminals: anode and cathode - no internal circuitry or additional pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-bias operation; carries forward current up to 200 mA. |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher potential side during regulation; defines reference node polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range (2–82 V) | Enables standardized BOM coverage across multiple voltage rails in industrial power designs. |
| E24 series nominal values | Supports common resistor ladder compatibility and simplifies reference selection in analog signal chains. |
| DO-41 glass sealed DHD structure | Provides mechanical robustness and thermal stability for mounting on PCBs with moderate airflow. |
| Positive γZ above 50 V | Allows predictable temperature-induced voltage rise, useful for compensating negative-drift components. |
| 175°C maximum junction temperature | Permits operation in enclosed enclosures or near heat-generating components without forced cooling. |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback converters operating at 24–48 V input. IC Role / Device Role / Timing Role: Zener reference element providing precise 56 V clamp for optocoupler bias and secondary-side regulation. Use Value: Maintains ±3% output regulation over −40 to +85°C ambient due to known +43 mV/°C drift and low ZZ. | Use Scenario: Protecting microcontroller I/O pins from ESD and inductive kickback in motor drive boards. IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing transients exceeding 56 V before reaching sensitive logic inputs. Use Value: Withstands 400 W surges (10 μs) without degradation, extending system MTBF in factory automation environments. |
| Analog Reference Voltage Source | Constant-Current Bias Generator |
Use Scenario: Generating stable bias for op-amp comparators in battery management systems. IC Role / Device Role / Timing Role: Precision voltage reference node for setting trip thresholds in voltage monitoring circuits. Use Value: Delivers <5 μA leakage at 43 V reverse bias, minimizing error in high-impedance divider networks. | Use Scenario: Setting fixed emitter current in discrete transistor amplifiers for audio preamps. IC Role / Device Role / Timing Role: Series-connected Zener establishing stable VBE offset for current mirror configuration. Use Value: 50 Ω dynamic impedance ensures <0.5 V current-induced variation across 10 mA ±2 mA load swing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5255B (ON Semiconductor) | 56 V nominal, 5% tolerance (53.2–58.8 V), 17 Ω ZZ, DO-35 package | Lower dynamic impedance but smaller DO-35 package limits power dissipation to 500 mW | Prefer for space-constrained designs where 0.5 W rating suffices and tighter ZZ improves regulation. |
| BZX55-C56 (Vishay) | 56 V nominal, 5% tolerance (53.2–58.8 V), 40 Ω ZZ, DO-35 package | Same voltage spec but rated only for 500 mW continuous power and lacks 400 W surge rating | Select when cost sensitivity outweighs surge immunity requirements and board layout allows DO-35 footprint. |
Compared with RD56F-T7-AZ, the 1N5255B offers lower dynamic impedance in a smaller package but sacrifices 500 mW of continuous power and all surge capability; the BZX55-C56 matches voltage tolerance and ZZ closely but cannot support the same thermal or transient stress profiles required in industrial-grade power designs.
Availability
RD56F-T7-AZ is available at Aetrix Electronics and suitable for industrial power supply regulation, overvoltage protection circuits, and analog reference voltage sources requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for RD56F-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 manufacturer specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
The RD-series Zener diodes were developed for high-reliability voltage reference and transient suppression in industrial equipment, emphasizing thermal stability, wide voltage grading, and rugged DO-41 packaging.
FAQ
What is the zener voltage tolerance for RD56F-T7-AZ?
The RD56F-T7-AZ is specified in the B grade, with a minimum zener voltage of 53 V and maximum of 60 V at 10 mA test current. This 7 V span reflects the full production tolerance band defined in Renesas Document No. D13936EJ5V0DS, and applies across the entire operating temperature range.
Does RD56F-T7-AZ have a positive or negative temperature coefficient?
The RD56F-T7-AZ has a positive zener voltage temperature coefficient of +43 mV/°C (typical), as confirmed in the Electrical Characteristics table on page 4 of the official datasheet. This behavior is characteristic of Zener diodes above ~50 V and enables predictable voltage drift compensation in reference designs.
What is the maximum surge reverse power rating for RD56F-T7-AZ?
The RD56F-T7-AZ supports a surge reverse power rating of 400 W for a pulse width of 10 μs, as specified in the Absolute Maximum Ratings table and illustrated in Figure 7 of the datasheet. This rating assumes non-repetitive pulses and requires external current limiting to prevent thermal runaway.
Is RD56F-T7-AZ compatible with automated through-hole assembly?
Yes, RD56F-T7-AZ uses a standard DO-41 axial-leaded package with 0.8 mm lead diameter and 25 mm minimum lead length, fully compatible with industry-standard through-hole insertion and wave soldering processes. Lead spacing and glass body dimensions conform to JEDEC DO-41 mechanical specifications.
What is the storage temperature range for RD56F-T7-AZ?
The RD56F-T7-AZ has a storage temperature range of −65°C to +175°C, matching its junction temperature limit. This wide range supports long-term warehouse storage and operation in uncontrolled environments such as outdoor industrial enclosures or transportation equipment.
RD56F-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:
- -
RD56F-T7-AZ FAQ
1.How can I place an order for RD56F-T7-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD56F-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 RD56F-T7-AZ reliable?
The price and inventory of RD56F-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 RD56F-T7-AZ is usually 5 days.
3.What payment methods are accepted for RD56F-T7-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD56F-T7-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD56F-T7-AZ?
RD56F-T7-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD56F-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 RD56F-T7-AZ?
For technical support, including RD56F-T7-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD56F-T7-AZ requirements.
6.How does Aetrix verify that RD56F-T7-AZ is sourced from the original manufacturer or authorized distributors?
All RD56F-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 RD56F-T7-AZ meets industry standards.
7.What is the process for return or replacement of RD56F-T7-AZ?
All RD56F-T7-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD56F-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 RD56F-T7-AZ part is unused and in its original packaging.
Return procedure for RD56F-T7-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD56F-T7-AZ Tags
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