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Renesas RD27F-T6
- Part No.:
- RD27F-T6
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD27F-T6.pdf
- Description:
- DIODE ZENER
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Inventory:3,804
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Product details
Overview
RD27F-T6 from Renesas Electronics is a 1 W planar silicon Zener diode in DO-41 glass-sealed DHD package, with nominal zener voltage 27 V (B3 grade: 26.72–28.43 V), dynamic impedance ≤16 Ω at 10 mA, and temperature coefficient +21 mV/°C. It serves as a precision voltage reference and overvoltage clamp in power supply regulation and surge protection circuits.
For engineers reviewing the RD27F-T6 datasheet, RD27F-T6 pinout, RD27F-T6 application, or RD27F-T6 equivalent, this page delivers verified electrical specs, thermal behavior, JEDEC DO-41 terminal mapping, and direct alternative options for voltage reference and transient suppression design-in.
Technical Context
The RD27F-T6 operates as a two-terminal voltage-regulating device relying on reverse-biased avalanche breakdown. Its planar junction structure ensures stable zener voltage tolerance and low dynamic impedance across its rated current range (10 mA test condition).
Thermal performance is defined by a maximum junction temperature of 175°C and transient thermal impedance of ~150°C/W at 10 ms pulse width. The device supports non-repetitive surge reverse power up to 400 W for 10 μs, per Figure 7 in D13936EJ5V0DS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.72–28.43 V (B3 grade, tested at 10 mA; enables ±3.2% tolerance voltage reference) |
| Power Dissipation (P) | 1.0 W at TA = 25°C (derates linearly above 25°C per Fig. 1; defines max continuous DC power handling) |
| Dynamic Impedance (ZZ) | ≤16 Ω at IZ = 10 mA (low AC impedance ensures minimal output voltage variation under load transients) |
| Zener Voltage Tempco (γZ) | +21 mV/°C (positive tempco stabilizes reference drift in warm ambient environments) |
| Reverse Current (IR) | ≤10 μA at VR = 20 V (low leakage preserves efficiency in high-impedance bias networks) |
| Surge Reverse Power (PRSM) | 400 W at t = 10 μs (supports single-event ESD/surge clamping without failure) |
| Junction Temperature (Tj) | −65 to +175°C (wide operating range suits industrial and automotive under-hood applications) |
Pinout & Package
RD27F-T6 uses a DO-41 axial glass package (JEDEC standard) with cathode indicated by a black band. The device has two terminals: anode and cathode - no internal circuitry or control logic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side | Connected to ground or lower potential node in reverse-bias voltage reference configuration |
| Cathode | Zener breakdown terminal / high-voltage side | Marked with black band; connects to input rail to clamp voltage at VZ during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 1 W Planar Zener Structure | Enables stable voltage regulation with low noise and repeatable breakdown characteristics in compact DO-41 form factor |
| E24-Series Voltage Nominal Values | Supports standardized BOM selection across 2–82 V range; RD27F-T6 aligns with 27 V E24 step for interoperability |
| B3 Voltage Grade Tolerance | ±3.2% (26.72–28.43 V) provides tighter binning than B/B1/B2 for critical reference applications |
| DO-41 Glass Sealed DHD Package | Double heatsink construction improves thermal dissipation vs. standard DO-41; supports 1 W rating with minimal PCB copper |
| Positive Temperature Coefficient | +21 mV/°C compensates for negative tempcos of other components (e.g., transistors) in mixed-technology analog circuits |
Applications
| Voltage Reference Circuit | Surge Absorption Circuit |
|---|---|
Use Scenario: Stable 27 V reference for ADC biasing and op-amp feedback networks in industrial sensor signal conditioning. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing fixed DC potential independent of supply ripple. Use Value: Low 16 Ω dynamic impedance minimizes reference error under varying load currents up to 10 mA. |
Use Scenario: Protection of 24 V DC input rails against induced lightning surges and inductive kickback in PLC I/O modules. IC Role / Device Role / Timing Role: Fast-acting shunt clamp that conducts only when input exceeds 28.43 V (B3 max). Use Value: 400 W surge rating at 10 μs allows absorption of IEC 61000-4-5 Level 3 transients without degradation. |
| Waveform Clipper Circuit | Constant-Current Bias Network |
Use Scenario: Audio line-level limiting in professional mixer front-ends to prevent amplifier saturation. IC Role / Device Role / Timing Role: Bidirectional clipping element (with series diode) limiting peak swing to ±27 V. Use Value: Sharp knee and low ZZ ensure clean, repeatable clipping threshold with minimal distortion. |
Use Scenario: Setting precise bias current for laser diodes in fiber-optic transceivers requiring stable optical output. IC Role / Device Role / Timing Role: Zener-based current source where RD27F-T6 establishes reference voltage across emitter resistor. Use Value: +21 mV/°C tempco counterbalances transistor VBE drift, improving current stability over −40 to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4750A | 27 V nominal, ±5% tolerance (25.65–28.35 V), ZZ ≤ 35 Ω at 11.5 mA, DO-41 package | Wider voltage tolerance and higher ZZ reduce precision in reference use but suit general-purpose clamping | Select 1N4750A for cost-sensitive designs where ±5% VZ and higher dynamic impedance are acceptable |
| BZX85C27 | 27 V nominal, ±5% tolerance (25.65–28.35 V), P = 1.3 W, ZZ ≤ 35 Ω at 5 mA, DO-41 | Higher power rating enables longer surge duty cycles; lower test current shifts operating point in bias networks | Choose BZX85C27 when extended surge endurance or compatibility with legacy 5 mA test conditions is required |
Compared with RD27F-T6, 1N4750A offers broader availability but looser tolerance and higher impedance, while BZX85C27 trades tighter thermal derating for higher surge margin - RD27F-T6 uniquely balances B3-grade precision, +21 mV/°C tempco, and DHD thermal performance in DO-41.
Availability
RD27F-T6 is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controller (PLC) input protection, sensor reference circuits, and telecom surge suppression requiring stable component supply and long-lifecycle support.
Supply support for RD27F-T6 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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.
The RD27F-T6 belongs to Renesas' legacy RD-series planar Zener diode family, designed for high-reliability voltage regulation and transient suppression in industrial and communications equipment.
FAQ
What is the exact zener voltage range for RD27F-T6?
The RD27F-T6 is specified as a B3-grade device with a zener voltage range of 26.72 V to 28.43 V at 10 mA test current, per Renesas datasheet D13936EJ5V0DS. This ±3.2% tolerance is tighter than B1/B2 grades and supports precision reference applications where stable 27 V regulation is required. The RD27F-T6 must be operated within its absolute maximum ratings to maintain this specification.
Does RD27F-T6 have a cathode marking, and how is polarity identified?
Yes, RD27F-T6 features a black cathode band on the glass body, consistent with JEDEC DO-41 standard marking. The terminal adjacent to the black band is the cathode; the opposite lead is the anode. This polarity is critical for correct reverse-bias operation - applying forward bias exceeds the 200 mA absolute maximum forward current and risks permanent damage to the RD27F-T6.
What is the thermal resistance and maximum junction temperature of RD27F-T6?
The RD27F-T6 has a maximum junction temperature (Tj) of 175°C and exhibits transient thermal impedance of approximately 150°C/W at 10 ms pulse width, as shown in Figure 8 of D13936EJ5V0DS. Its DO-41 DHD (Double Heatsink Diode) construction improves heat transfer versus standard DO-41, enabling full 1 W dissipation at 25°C ambient. Derating is required above 25°C per Figure 1.
Can RD27F-T6 be used in surge protection applications, and what is its surge rating?
Yes, RD27F-T6 is explicitly rated for surge absorption with a non-repetitive surge reverse power (PRSM) of 400 W at 10 μs pulse width, per Figure 7 in the official datasheet. This makes it suitable for clamping IEC 61000-4-5-compliant transients in 24 V industrial systems. For repetitive surges, average power must remain within the 1 W DC limit to avoid thermal runaway in the RD27F-T6.
How does the temperature coefficient of RD27F-T6 affect circuit performance?
The RD27F-T6 has a typical zener voltage temperature coefficient (γZ) of +21 mV/°C, meaning its regulated voltage increases linearly with temperature. This positive tempco can offset the negative tempco of bipolar junction transistors or resistive dividers in analog circuits, improving overall thermal stability. Designers should verify system-level drift across −40°C to +125°C using the RD27F-T6's published γZ curve in Figure 4.
RD27F-T6 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-T6 FAQ
1.How can I place an order for RD27F-T6 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD27F-T6 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-T6 reliable?
The price and inventory of RD27F-T6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD27F-T6 is usually 5 days.
3.What payment methods are accepted for RD27F-T6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD27F-T6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD27F-T6?
RD27F-T6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD27F-T6 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-T6?
For technical support, including RD27F-T6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD27F-T6 requirements.
6.How does Aetrix verify that RD27F-T6 is sourced from the original manufacturer or authorized distributors?
All RD27F-T6 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-T6 meets industry standards.
7.What is the process for return or replacement of RD27F-T6?
All RD27F-T6 units undergo pre-shipment inspection (PSI). If there is an issue with RD27F-T6, 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-T6 part is unused and in its original packaging.
Return procedure for RD27F-T6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD27F-T6 Tags
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