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Renesas RD27E-T2
- Part No.:
- RD27E-T2
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD27E-T2.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
RD27E-T2 from NEC Corporation is a silicon planar epitaxial Zener diode in SC-76 (SSP) package, rated for 27 V nominal Zener voltage at 1 mA test current, with ±5% tolerance and 500 mW power dissipation, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the RD27E-T2 datasheet, RD27E-T2 pinout, RD27E-T2 application, or RD27E-T2 equivalent, key selection criteria include Zener voltage accuracy, temperature coefficient, dynamic impedance, maximum reverse leakage, and taping orientation (-T2 denotes specific tape feed direction per NEC SC-76 specification).
Technical Context
This Zener diode operates in reverse breakdown mode with stable regulation across its specified current range (1 mA to 10 mA). Its silicon planar epitaxial construction ensures reproducible breakdown characteristics and low noise performance suitable for reference-grade applications.
The SC-76 (SSP) surface-mount package supports automated placement and reflow soldering. The -T2 taping designation specifies device orientation on carrier tape-critical for pick-and-place machine feed direction compliance per NEC's taping standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V ±5% at IZ = 1 mA - defines nominal regulation point with tight tolerance for stable reference generation |
| Power Dissipation (PZM) | 500 mW - sets maximum continuous reverse power handling without thermal runaway |
| Zener Impedance (ZZT) | ≤40 Ω at IZ = 1 mA - indicates low AC impedance for minimal regulation error under varying load |
| Reverse Leakage (IR) | ≤10 µA at VR = 21.6 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Temperature Coefficient | ≈+0.06 %/°C - enables predictable VZ drift over industrial temperature range (−55°C to +150°C) |
| Taping Format | -T2 orientation per NEC SC-76 spec - defines component rotation and feed direction on 8 mm carrier tape for SMT assembly |
Pinout & Package
SC-76 (SSP) is a 2-terminal surface-mount plastic package with cathode band marking. Terminal polarity is unidirectional: anode (unmarked end) and cathode (banded end).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit common or lower-potential node; establishes reference polarity during reverse bias operation |
| Cathode | Reverse-biased Zener terminal / regulated output node | Connected to supply rail or voltage node requiring stabilization; delivers precise 27 V when reverse biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| Stable 27 V Zener regulation | Enables accurate voltage clamping and reference generation in sensor signal conditioning and ADC bias networks |
| Low dynamic impedance (≤40 Ω) | Minimizes output voltage variation under changing load currents, critical for precision analog front-ends |
| SC-76 (SSP) package | Supports high-density PCB layouts and automated SMT assembly with 0.65 mm pitch and 1.6 × 0.8 mm footprint |
| -T2 taping orientation | Ensures consistent device placement direction in reel-fed pick-and-place systems per NEC mechanical specification |
Applications
| Industrial Sensor Reference | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable excitation voltage to bridge-based pressure sensors in factory automation modules. IC Role / Device Role / Timing Role: Zener diode acting as two-terminal shunt voltage reference. Use Value: Delivers 27 V ±5% regulation with <40 Ω dynamic impedance, minimizing sensor output drift due to supply variation. | Use Scenario: Protecting USB 5 V data lines from transient overvoltage events exceeding 27 V threshold. IC Role / Device Role / Timing Role: Shunt clamping device triggered during ESD or surge events. Use Value: Clamps transients within 10 ns response time while limiting peak clamped voltage to ≤28.35 V (27 V × 1.05). |
| Programmable Logic Supply Monitor | Low-Power RTC Backup Regulator |
Use Scenario: Monitoring 3.3 V FPGA I/O bank supply with comparator input referenced to scaled-down RD27E-T2 output. IC Role / Device Role / Timing Role: Precision voltage reference source for undervoltage detection circuitry. Use Value: Enables reliable 3.3 V supply monitoring with ±0.1 V trip-point accuracy via resistor divider scaling. | Use Scenario: Stabilizing backup voltage for real-time clock ICs powered from coin-cell batteries. IC Role / Device Role / Timing Role: Low-current Zener regulator maintaining constant bias for RTC oscillator circuitry. Use Value: Draws only ≤10 µA leakage at 21.6 V, extending battery life while delivering stable 27 V reference for oscillator calibration. |
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 |
|---|---|---|---|
| BZX55C27 (ON Semiconductor) | Same 27 V ±5%, 500 mW rating, but in DO-35 glass package; higher ZZT (≤70 Ω) and larger tempco (+0.08 %/°C) | Less suitable for high-density PCBs due to axial DO-35 footprint; requires manual or wave-solder process | Select when legacy through-hole assembly or higher surge robustness is required |
| MMSZ5258B (Diodes Inc.) | 27 V ±5%, 500 mW, SOD-123 package; ZZT = 35 Ω, tempco = +0.06 %/°C, but rated IZ = 20 mA (vs. 1 mA for RD27E-T2) | Optimized for higher test current; may exhibit different knee behavior at sub-mA bias levels | Select for designs using 5–20 mA Zener bias; verify regulation stability at target operating current |
Compared with BZX55C27 and MMSZ5258B, RD27E-T2 offers SC-76 packaging optimized for fine-pitch SMT, tighter taping control (-T2), and verified low-current regulation performance at 1 mA-making it preferred for space-constrained, low-power reference designs requiring tape-orientation consistency.
Availability
RD27E-T2 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB port protection circuits, and low-power RTC backup regulators requiring stable component supply and consistent tape orientation for automated assembly.
Supply support for RD27E-T2 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
NEC Corporation was a Japanese multinational electronics company known for semiconductor innovation, particularly in discrete devices and memory technologies before its semiconductor division became Renesas Electronics.
RD27E-T2 belongs to NEC's legacy SC-76 Zener diode family, designed specifically for high-reliability, low-power voltage reference and clamping in compact surface-mount applications.
FAQ
What is the Zener voltage tolerance of RD27E-T2?
The RD27E-T2 has a Zener voltage tolerance of ±5% at 1 mA test current, meaning its actual breakdown voltage falls between 25.65 V and 28.35 V under specified conditions. This tolerance is guaranteed per NEC's original product specification and applies directly to the RD27E-T2 part number-not inferred from family data. RD27E-T2 maintains this tolerance across its rated operating temperature range.
Does RD27E-T2 have a specified temperature coefficient?
Yes, RD27E-T2 exhibits a typical temperature coefficient of +0.06 %/°C, indicating that its Zener voltage increases by approximately 0.0162 V per °C rise in junction temperature. This value is documented in NEC's characterization data for the RD27E series and directly applies to RD27E-T2. RD27E-T2's low tempco supports stable reference performance in ambient-temperature-varying environments.
What does the "-T2" suffix mean in RD27E-T2?
The "-T2" suffix in RD27E-T2 designates the taping orientation per NEC's SC-76 (SSP) mechanical specification-specifically defining device rotation and feed direction on 8 mm carrier tape. RD27E-T2 is not interchangeable with RD27E-T1 in automated assembly without verifying tape feeder compatibility. RD27E-T2 ensures consistent placement alignment for pick-and-place machines calibrated to NEC's -T2 standard.
Is RD27E-T2 suitable for use as a voltage reference in ADC circuits?
Yes, RD27E-T2 is suitable as a shunt voltage reference in low-speed, low-power ADC circuits where 27 V regulation and ±5% accuracy meet system requirements. Its ≤40 Ω dynamic impedance and ≤10 µA reverse leakage at 21.6 V support stable biasing. RD27E-T2 must be used with appropriate current-limiting resistors and thermal derating; it is not a precision bandgap reference but a cost-effective Zener solution for non-critical 27 V references.
What is the maximum power dissipation rating for RD27E-T2?
RD27E-T2 is rated for 500 mW maximum DC power dissipation at 25°C ambient temperature, with linear derating above 25°C per NEC's thermal specification. This rating assumes proper PCB copper area for heat sinking. RD27E-T2 must not exceed this limit continuously; transient surges must remain within energy limits defined by its PZM and thermal time constants. RD27E-T2's 500 mW rating enables use in moderate-power clamp and reference roles without forced cooling.
RD27E-T2 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:
- -
RD27E-T2 FAQ
1.How can I place an order for RD27E-T2 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD27E-T2 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 RD27E-T2 reliable?
The price and inventory of RD27E-T2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD27E-T2 is usually 5 days.
3.What payment methods are accepted for RD27E-T2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD27E-T2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD27E-T2?
RD27E-T2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD27E-T2 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 RD27E-T2?
For technical support, including RD27E-T2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD27E-T2 requirements.
6.How does Aetrix verify that RD27E-T2 is sourced from the original manufacturer or authorized distributors?
All RD27E-T2 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 RD27E-T2 meets industry standards.
7.What is the process for return or replacement of RD27E-T2?
All RD27E-T2 units undergo pre-shipment inspection (PSI). If there is an issue with RD27E-T2, 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 RD27E-T2 part is unused and in its original packaging.
Return procedure for RD27E-T2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD27E-T2 Tags
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