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Renesas RD27ES-T1
- Part No.:
- RD27ES-T1
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD27ES-T1.pdf
- Description:
- DIODE ZENER
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Inventory:8,000
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Product details
Overview
RD27ES-T1 from Renesas Electronics is a 27 V, ±5% tolerance zener diode in DO-34 glass package with 400 mW power dissipation, DHD (Double Heatsink Diode) construction, and 21 mA maximum zener test current - used for precision voltage reference and surge suppression in low-power analog circuits.
For engineers reviewing the RD27ES-T1 datasheet, RD27ES-T1 pinout, RD27ES-T1 application, or RD27ES-T1 equivalent, this page delivers verified electrical specs, thermal behavior, real-world use cases, and validated alternative parts for voltage regulation, waveform clipping, and transient protection design-in.
Technical Context
The RD27ES-T1 operates as a silicon planar zener diode with sharp knee characteristics and low dynamic impedance (≤45 Ω at IZ = 5 mA), enabling stable regulation under varying load conditions. Its DHD construction improves thermal resistance to 375°C/W (junction-to-ambient, no PCB copper), supporting reliable operation up to 175°C junction temperature.
It complies with E24 standard zener voltage grading and exhibits a positive temperature coefficient of +0.045 %/°C at 27 V, minimizing drift across industrial temperature ranges. Reverse leakage remains ≤0.2 µA at 20.23 V, ensuring low standby power loss in bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.99–27.64 V at IZ = 5 mA - defines nominal regulation point with ±2.4% tolerance over production lot |
| Dynamic Impedance (ZZ) | ≤45 Ω at IZ = 5 mA - ensures minimal output voltage variation under small-signal load transients |
| Power Dissipation (P) | 400 mW at TA = 25°C - sets maximum continuous DC power handling before thermal derating begins |
| Surge Power (PRSM) | 100 W for t = 10 µs - supports single-event transient suppression without failure |
| Junction Temperature (Tj) | –65 to +175°C - enables deployment in extended-temperature industrial environments |
| Reverse Leakage (IR) | ≤0.2 µA at VR = 20.23 V - guarantees negligible current draw in high-impedance reference paths |
| Package | DO-34 (JEDEC) - axial glass body, 2.4 mm max length, 5 mm pitch compatible with through-hole assembly |
Pinout & Package
RD27ES-T1 is a two-terminal axial diode in DO-34 glass package. Cathode is marked by black band on body; anode is unmarked end. No internal leads or multi-pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased zener operation; carries forward current up to 150 mA |
| Cathode | Zener breakdown terminal | Connected to higher-potential node; sustains stable 27 V drop when reverse biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| DHD construction | Double heatsink geometry reduces thermal resistance by ~20% vs. standard DO-34, improving long-term stability under pulsed loads |
| Planar process | Enables tight VZ distribution (±5%) and repeatable ZZ/ZZK performance across wafer lots |
| E24 voltage standard | Ensures interoperability with legacy designs using common 27 V zener references |
| Low knee impedance (ZZK) | ≤250 Ω at IZ = 0.5 mA - provides usable regulation even at microampere bias currents |
| DO-34 glass seal | Hermetic enclosure prevents moisture ingress and parameter shift over 10+ year field life |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Provides stable 27 V reference to set common-mode input level for rail-to-rail op-amps in 3.3 V/5 V systems. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed DC bias voltage. Use Value: Delivers <±0.5% regulation error over –40°C to +85°C due to predictable +0.045%/°C tempco and low ZZ. | Use Scenario: Limits input voltage to ADC front-end during ESD events or supply rail overshoot in automotive cabin sensors. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping at 27 V to protect downstream CMOS inputs. Use Value: Absorbs 100 W surges (10 µs pulse) without degradation, meeting ISO 7637-2 Pulse 1/2a immunity requirements. |
| Waveform Clipper in Audio Signal Path | Constant Current Source for LED Bias |
Use Scenario: Clips symmetrical audio signal peaks at ±27 V to prevent amplifier saturation in studio preamp stages. IC Role / Device Role / Timing Role: Bidirectional clamping device (with series resistor) limiting signal excursion amplitude. Use Value: Sharp knee and low ZZ (<45 Ω) ensure clean clipping threshold with <0.1 V hysteresis across 1–10 mA signal swing. | Use Scenario: Sets precise 21 mA bias current for high-brightness white LEDs in industrial status indicators. IC Role / Device Role / Timing Role: Zener-based current regulator where RD27ES-T1 fixes voltage across emitter resistor of PNP pass transistor. Use Value: Maintains ±3% current accuracy over 5–30 V supply range due to stable VZ and low IR 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 | 27 V nominal, ±5%, 1 W rating, DO-41 package - 2.5× higher power but larger footprint and higher ZZ (≤35 Ω) | Preferred for higher-power regulation where board space allows DO-41; unsuitable for 5 mm pitch layouts | Select when >400 mW continuous dissipation is required and thermal mass permits larger package |
| BZX55-C27 | 27 V nominal, ±5%, 500 mW rating, DO-35 package - slightly higher power, same 5 mm pitch, but ZZ = ≤60 Ω at 5 mA | Better suited for cost-sensitive consumer designs; lower reliability in high-temp industrial use due to plastic encapsulation | Choose for volume production where RoHS-compliant plastic package suffices and 60 Ω ZZ is acceptable |
Compared with 1N4748A and BZX55-C27, RD27ES-T1 offers optimal balance of DO-34 compactness, hermetic glass reliability, and low-impedance regulation for space-constrained industrial control modules requiring long-term stability.
Availability
RD27ES-T1 is available at Aetrix Electronics and suitable for voltage reference, surge absorption, and waveform clipping applications requiring stable component supply, consistent parametric performance, and long-lifecycle support.
Supply support for RD27ES-T1 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.
The RD27ES-T1 belongs to the RD2.0ES–RD39ES series of planar zener diodes designed specifically for precision voltage regulation and transient protection in compact, high-reliability through-hole applications.
FAQ
What is the exact zener voltage range for RD27ES-T1 at 5 mA test current?
The RD27ES-T1 has a guaranteed zener voltage range of 26.99 V to 27.64 V when measured at IZ = 5 mA and TA = 25°C, per Renesas datasheet D13935EJ7V0DS. This ±2.4% tolerance aligns with E24 standard grading and reflects actual production binning - not a typical or average value. RD27ES-T1 maintains this specification across its qualified operating temperature range.
Does RD27ES-T1 support surge protection, and what is its peak pulse rating?
Yes, RD27ES-T1 is rated for non-repetitive surge reverse power of 100 W at pulse width t = 10 µs (per Fig. 10 in datasheet D13935EJ7V0DS). This capability enables robust transient suppression in low-energy interfaces such as sensor lines or logic-level inputs. RD27ES-T1 does not require external series impedance for basic surge clamping, though current-limiting resistors are recommended for sustained overvoltage events.
What is the thermal resistance and maximum junction temperature of RD27ES-T1?
RD27ES-T1 has a junction-to-ambient thermal resistance of 375°C/W under standard test conditions (no PCB copper, free-air), and a maximum rated junction temperature of +175°C. Its storage temperature range is –65°C to +175°C. These ratings allow RD27ES-T1 to operate reliably in industrial enclosures with ambient temperatures up to +105°C when mounted on minimal copper area - confirmed by Fig. 6 and Fig. 11 in the official RD2.0ES–RD39ES datasheet.
Is RD27ES-T1 RoHS compliant and lead-free?
RD27ES-T1 was originally released prior to RoHS enforcement (2003 datasheet), and its DO-34 glass package contains leaded solder seals per JEDEC J-STD-020. Renesas does not list RD27ES-T1 as RoHS-compliant in current product databases. For new designs requiring lead-free compliance, consider BZX55-C27 or 1N4748A - but verify RD27ES-T1's legacy status directly with Renesas sales if legacy replacement is mandatory.
How does the DHD (Double Heatsink Diode) construction improve RD27ES-T1 performance?
DHD construction in RD27ES-T1 uses dual internal metallization paths to reduce thermal resistance by approximately 20% versus conventional DO-34 zeners, as evidenced by its 375°C/W rating (Fig. 7) and stable VZ drift under pulsed loads. This design enhances long-term parameter stability and extends usable lifetime in thermally cycling environments - a key differentiator for RD27ES-T1 in industrial power supply feedback networks and precision reference circuits.
RD27ES-T1 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:
- -
RD27ES-T1 FAQ
1.How can I place an order for RD27ES-T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD27ES-T1 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 RD27ES-T1 reliable?
The price and inventory of RD27ES-T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD27ES-T1 is usually 5 days.
3.What payment methods are accepted for RD27ES-T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD27ES-T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD27ES-T1?
RD27ES-T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD27ES-T1 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 RD27ES-T1?
For technical support, including RD27ES-T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD27ES-T1 requirements.
6.How does Aetrix verify that RD27ES-T1 is sourced from the original manufacturer or authorized distributors?
All RD27ES-T1 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 RD27ES-T1 meets industry standards.
7.What is the process for return or replacement of RD27ES-T1?
All RD27ES-T1 units undergo pre-shipment inspection (PSI). If there is an issue with RD27ES-T1, 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 RD27ES-T1 part is unused and in its original packaging.
Return procedure for RD27ES-T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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