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Renesas RD27F-T7-AZ
- Part No.:
- RD27F-T7-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD27F-T7-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
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- Shipping:
Inventory:24,990
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Product details
Overview
RD27F-T7-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode with a nominal zener voltage of 27 V (B3 grade: 26.72–28.43 V), dynamic impedance of 16 Ω at 10 mA, and zener voltage temperature coefficient of +24 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 supply rails.
For engineers reviewing the RD27F-T7-AZ datasheet, RD27F-T7-AZ pinout, RD27F-T7-AZ application, or RD27F-T7-AZ equivalent, this page delivers verified electrical specs, thermal behavior, JEDEC DO-41 terminal mapping, and direct alternative options for voltage reference and transient protection design.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage under varying current loads. Its planar junction structure ensures consistent breakdown characteristics and low leakage, while the glass-sealed DO-41 package provides mechanical robustness and thermal stability up to 175°C junction temperature.
It supports constant-voltage regulation at 10 mA test current (IZ), exhibits 10 μA maximum reverse current at VR = 20 V, and handles 400 W surge reverse power for 10 μs pulses-enabling reliable clamping in transient overvoltage events without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.72–28.43 V (B3 grade, tested at 10 mA; enables precise 27 V reference with ±3% tolerance) |
| Power Dissipation (P) | 1.0 W at TA = 25°C (derates linearly above 25°C per Figure 1; supports continuous regulation in compact PCB layouts) |
| Dynamic Impedance (ZZ) | 16 Ω max at IZ = 10 mA (low AC impedance ensures minimal output voltage variation under load transients) |
| Reverse Current (IR) | 10 μA max at VR = 20 V (low leakage preserves efficiency in high-impedance bias networks) |
| Zener Temp. Coefficient (γZ) | +24 mV/°C typical (positive TC allows predictable drift compensation in temperature-stable references) |
| Junction Temperature (Tj) | −65 to +175°C (wide operating range supports use in industrial environments without derating) |
| Surge Reverse Power (PRSM) | 400 W for t = 10 μs (enables single-pulse ESD/surge suppression without external TVS staging) |
Pinout & Package
RD27F-T7-AZ uses a standard JEDEC DO-41 axial glass package (3.0 mm diameter × 5.0 mm length) with cathode indicated by a black band. The device has two terminals: anode and cathode - no internal connections or multi-pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower potential; defines polarity for reverse-bias operation |
| Cathode | Zener breakdown terminal / Voltage reference node | Marked with black band; connected to regulated rail or input side of clamp circuit |
Key Features
| Feature | Design Value |
|---|---|
| 1 W Planar Zener Structure | Enables stable voltage regulation with low ZZ and repeatable breakdown across production lots |
| E24-Series Voltage Grading | Supports standardized B1/B2/B3 binning for tight VZ matching in multi-rail systems |
| DO-41 Glass Sealing | Provides hermetic reliability and thermal resistance suitable for reflow and wave soldering |
| +24 mV/°C γZ (Typical) | Allows predictable temperature-induced VZ shift for compensated reference designs |
| 400 W Surge Rating (10 μs) | Permits direct placement at board-level inputs without additional transient suppressors |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Clamping |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Zener reference providing fixed 27 V threshold to optocoupler input or TL431 shunt regulator. Use Value: Maintains ±1% output regulation across line/load/temperature with <16 Ω dynamic impedance limiting error amplifier gain variation. |
Use Scenario: Protecting microcontroller I/O pins from induced surges on 24 V sensor lines. IC Role / Device Role / Timing Role: Fast-acting clamp limiting voltage to 28.43 V during 1 kV EFT bursts. Use Value: Absorbs 400 W peak energy in 10 μs without failure, preventing latch-up or gate oxide damage. |
| Waveform Limiting in Signal Conditioning | Temperature-Compensated Reference Generation |
Use Scenario: Hard-limiting analog sensor outputs to prevent ADC saturation in 0–30 V measurement ranges. IC Role / Device Role / Timing Role: Bidirectional clipping element (with series resistor) shaping signal peaks at ±27 V. Use Value: Symmetric clamping achieved using dual RD27F-T7-AZ devices; low ZZ ensures sharp knee and minimal distortion. |
Use Scenario: Building a 27 V reference with reduced thermal drift using matched positive-TC Zeners. IC Role / Device Role / Timing Role: Primary voltage reference element in oven-controlled or compensated voltage source. Use Value: +24 mV/°C TC enables pairing with negative-TC components (e.g., forward-biased diodes) to achieve near-zero net drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A | Zener voltage 27 V (25.65–28.35 V), 1 W, DO-41, ZZ = 19 Ω @ 10 mA, γZ = +22 mV/°C | Narrower VZ tolerance (±5% vs. RD27F-T7-AZ's ±3.2% B3 grade); identical surge rating | Acceptable where tighter VZ binning is not required; widely stocked but lacks Renesas' extended thermal validation. |
| BZX85C27 | Zener voltage 27 V (25.7–28.3 V), 1.3 W, DO-41, ZZ = 35 Ω @ 5 mA, γZ = +25 mV/°C | Higher power rating but higher dynamic impedance reduces regulation accuracy under dynamic loads | Preferred for higher-power dissipation needs (>1 W average), but less suitable for precision reference due to elevated ZZ. |
Compared with RD27F-T7-AZ, the 1N4748A offers broader availability but looser VZ tolerance, while the BZX85C27 trades regulation precision for higher steady-state power handling-making RD27F-T7-AZ optimal for applications demanding both tight voltage control and reliable transient suppression in industrial settings.
Availability
RD27F-T7-AZ is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface protection circuits, and analog signal conditioning systems requiring stable component supply and long-term obsolescence management.
Supply support for RD27F-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 headquartered in Japan, specializing in microcontrollers, analog and power devices, and system-on-chip solutions for industrial, automotive, and infrastructure markets.
RD27F-T7-AZ belongs to Renesas' legacy RD-series planar Zener diodes, designed specifically for high-reliability voltage reference and surge suppression in industrial-grade power conversion and signal conditioning applications.
FAQ
What is the exact zener voltage range for RD27F-T7-AZ?
The RD27F-T7-AZ is specified in the B3 voltage classification with a minimum zener voltage of 26.72 V and a maximum of 28.43 V at 10 mA test current (IZ), per Renesas datasheet D13936EJ5V0DS. This 3.2% tolerance window reflects tighter binning than standard B-grade parts and supports precision regulation requirements in industrial equipment.
Does RD27F-T7-AZ have a specified surge rating, and how is it applied?
Yes, RD27F-T7-AZ has a surge reverse power rating of 400 W for pulse width t = 10 μs at TA = 25°C, as defined in Figure 7 of the official datasheet. This rating applies to single non-repetitive transients and enables direct use in IEC 61000-4-4 EFT protection without cascaded TVS stages, provided layout minimizes parasitic inductance.
What is the thermal resistance and maximum junction temperature of RD27F-T7-AZ?
RD27F-T7-AZ has a maximum junction temperature (Tj) of 175°C and a storage temperature range of −65°C to +175°C. Its thermal resistance depends on PCB copper area (Figure 2), with Rth ≈ 200°C/W for S = 5 mm² and dropping to ~80°C/W for S = 20 mm². Derating follows the curve in Figure 1, reducing to 0.5 W at 125°C ambient.
Is RD27F-T7-AZ RoHS compliant and lead-free?
Yes, RD27F-T7-AZ complies with the EU RoHS Directive, as confirmed by Renesas Electronics' environmental compliance documentation. The device uses lead-free terminations and halogen-free molding compounds, meeting JEDEC J-STD-609A Class 1 marking requirements for lead-free identification.
What does the "T7-AZ" suffix indicate in RD27F-T7-AZ?
The "T7-AZ" suffix denotes tape-and-reel packaging (T7) and an industry-standard date code/traceability format (AZ), per Renesas' ordering conventions. It does not affect electrical specifications-RD27F-T7-AZ shares identical zener voltage, impedance, and thermal characteristics with bulk RD27F parts, differing only in packaging and reel quantity (typically 5,000 pcs/reel).
RD27F-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:
- -
RD27F-T7-AZ FAQ
1.How can I place an order for RD27F-T7-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD27F-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 RD27F-T7-AZ reliable?
The price and inventory of RD27F-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 RD27F-T7-AZ is usually 5 days.
3.What payment methods are accepted for RD27F-T7-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD27F-T7-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD27F-T7-AZ?
RD27F-T7-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD27F-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 RD27F-T7-AZ?
For technical support, including RD27F-T7-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD27F-T7-AZ requirements.
6.How does Aetrix verify that RD27F-T7-AZ is sourced from the original manufacturer or authorized distributors?
All RD27F-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 RD27F-T7-AZ meets industry standards.
7.What is the process for return or replacement of RD27F-T7-AZ?
All RD27F-T7-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD27F-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 RD27F-T7-AZ part is unused and in its original packaging.
Return procedure for RD27F-T7-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD27F-T7-AZ Tags
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