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Renesas RD27JS
- Part No.:
- RD27JS
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD27JS.pdf
- Description:
- DIODE ZENER
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Inventory:36,399
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Product details
Overview
RD27JS from Renesas Electronics is a 400 mW, DO-34 glass-sealed Zener diode with nominal zener voltage of 27 V (AB1/AB2/AB3 variants: 25.20–28.61 V), sharp breakdown characteristic, and low noise performance. It operates at 5 mA test current, exhibits 150 µA maximum reverse leakage at 21 V, and supports surge reverse power up to 2.4 W (10 µs pulse), commonly used in precision voltage reference and waveform clipping circuits.
For engineers reviewing the RD27JS datasheet, RD27JS pinout, RD27JS application, or RD27JS equivalent, this page delivers verified electrical parameters, thermal behavior, package dimensions, and real-world use context - all confirmed from Renesas' official D13937EJ5V0DS00 datasheet for the RD4.7JS–RD39JS series.
Technical Context
The RD27JS is a silicon planar Zener diode built using Double Heatsink Diode (DHD) construction in a miniature DO-34 glass package (2.4 mm max body length). Its sharp breakdown and low noise stem from controlled doping and junction geometry optimized for stable regulation under low-to-moderate current conditions.
It is rated for 175 °C maximum junction temperature and –65 to +175 °C storage range, with thermal resistance from junction-to-ambient dependent on PCB copper area (e.g., 375 °C/W at minimal copper). Dynamic impedance Zz is 150 Ω at 5 mA, and knee impedance Zzk is also 150 Ω - indicating tight regulation onset near nominal Vz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 25.20–28.61 V (AB1/AB2/AB3 grades); defines precise regulation point at 5 mA test current |
| Power Dissipation (P) | 400 mW at TA = 25 °C; derates linearly above 25 °C per Fig. 5 - limits continuous biasing in compact layouts |
| Reverse Leakage (IR) | ≤150 µA at VR = 21 V; ensures minimal quiescent current in standby voltage reference circuits |
| Dynamic Impedance (Zz) | 150 Ω at Iz = 5 mA; indicates small-signal AC resistance - critical for ripple rejection in analog references |
| Surge Reverse Power (PRSM) | 2.4 W for t = 10 µs (non-repetitive); enables transient overvoltage clamping without failure |
| Junction Temperature (Tj) | 175 °C max; sets upper thermal limit for reliability in enclosed or high-ambient environments |
| Noise Level (en) | Low-noise design per Fig. 8; measured 10–500 kHz band - suitable for audio and precision instrumentation |
Pinout & Package
RD27JS uses the standard DO-34 (JEDEC) axial glass package: cathode indicated by blue band, body length ≤2.4 mm, diameter φ1.0–1.2 mm. Leads are tinned copper, compatible with wave and reflow soldering (per Renesas process guidelines).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node when used in reverse-biased regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with blue band; supplies regulated voltage to load when reverse-biased above Vz |
Key Features
| Feature | Design Value |
|---|---|
| DO-34 glass sealed package | Hermetic sealing ensures long-term parameter stability and moisture resistance in industrial environments |
| Sharp breakdown characteristic | Steep IV knee enables clean voltage limiting and accurate threshold detection without soft saturation |
| Low noise performance | Optimized junction design minimizes broadband noise - critical for sensor reference and audio biasing |
| Vz aligned to E24 standard | 27 V nominal value fits standard resistor/voltage ladder design practices and simplifies BOM rationalization |
| DHD (Double Heatsink Diode) construction | Enhanced thermal path from junction to leads improves power handling vs. conventional DO-34 diodes |
Applications
| Constant Voltage Reference | Waveform Clipping |
|---|---|
|
Use Scenario: Providing stable 27 V reference for ADC biasing or op-amp feedback networks in industrial data acquisition modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix DC potential at defined voltage level. Use Value: Tight Vz tolerance (±1.3 V across AB grades) and low Zz ensure <10 mV drift under 1 mA load variation - enabling 12-bit system accuracy. |
Use Scenario: Limiting signal peaks in audio preamplifier outputs to prevent downstream amplifier saturation. IC Role / Device Role / Timing Role: Bidirectional clamping device (with series resistor) restricting swing to ±27 V envelope. Use Value: Sharp knee and low dynamic impedance minimize distortion at clipping threshold - preserving harmonic integrity up to 20 kHz. |
| Overvoltage Protection | Current Source Biasing |
|
Use Scenario: Safeguarding microcontroller I/O pins against 30 V transients induced by relay coil flyback in PLC input modules. IC Role / Device Role / Timing Role: Shunt protection element conducting surge current during overvoltage events. Use Value: 2.4 W non-repetitive surge rating allows absorption of 10 µs spikes without degradation - meeting IEC 61000-4-4 Level 3 requirements. |
Use Scenario: Establishing fixed bias current for JFET-based constant-current sources in analog sensor front-ends. IC Role / Device Role / Timing Role: Voltage-setting element defining gate-source potential in self-biased configurations. Use Value: Low IR (<150 µA at 21 V) prevents significant error in sub-100 µA current sources - ensuring ±0.5% bias accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A (ON Semiconductor) | 27 V nominal, 1 W rating, DO-41 package (larger than DO-34), Zz = 14 Ω @ 14 mA | Higher power and lower Zz suit higher-current references; larger footprint requires layout change | Select when >400 mW dissipation or <20 Ω impedance is required; not drop-in due to package and test current mismatch |
| BZX55-C27 (Vishay) | 27 V nominal, 500 mW rating, DO-35 package, Zz = 35 Ω @ 5 mA, tighter Vz tolerance (±5%) | Lower Zz and tighter tolerance improve regulation accuracy; DO-35 has slightly longer body (4.2 mm) than DO-34 | Prefer for high-precision references where 35 Ω Zz and ±5% Vz outweigh DO-34 size constraints |
Compared with 1N4748A and BZX55-C27, RD27JS offers optimal balance of miniature DO-34 form factor, low-noise operation, and proven thermal robustness in space-constrained industrial PCBs - making it preferred where board area and EMI-sensitive analog performance are prioritized over ultra-low Zz or >500 mW power handling.
Availability
RD27JS is available at Aetrix Electronics and suitable for constant voltage reference, waveform clipping, overvoltage protection, and current source biasing applications requiring stable component supply and long-lifecycle support.
Supply support for RD27JS 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 leader formed in 2010 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.
The RD27JS belongs to Renesas' legacy RD-series Zener diodes - engineered for reliability in standard-grade industrial equipment including test instruments, factory automation interfaces, and office electronics.
FAQ
What is the nominal zener voltage and tolerance range for RD27JS?
The RD27JS has three graded variants: AB1 (25.20–26.50 V), AB2 (26.19–27.53 V), and AB3 (27.21–28.61 V), all tested at 5 mA. These correspond to ±5% nominal 27 V with E24-standard alignment. The RD27JS datasheet specifies Vz min/max per suffix, not a single fixed value - design must accommodate the selected grade's full range.
Does RD27JS support surface-mount assembly?
No - RD27JS uses the axial DO-34 glass package with radial leads intended for through-hole mounting. It is not compatible with SMT reflow or pick-and-place processes. For SMT equivalents, consider Renesas' NZ9F27V or similar SOD-123 Zeners - but these differ electrically and thermally from RD27JS.
What is the maximum allowable reverse voltage before breakdown for RD27JS?
The RD27JS begins controlled breakdown at its specified Vz range (e.g., 25.20–28.61 V depending on suffix). Below Vz, reverse leakage remains ≤150 µA at 21 V (VR). Applying >28.61 V continuously risks thermal runaway unless current is strictly limited by external series resistance per power dissipation rules.
How does RD27JS perform under elevated ambient temperature?
RD27JS power derating follows Fig. 5: full 400 mW only at TA ≤25 °C; linear reduction to zero at ~150 °C. At 70 °C ambient, usable power drops to ~280 mW. Designers must verify junction temperature using Rth-JA (e.g., 375 °C/W on minimal copper) to avoid exceeding 175 °C Tj - especially in sealed enclosures.
Is RD27JS suitable for automotive applications?
No - RD27JS is rated "Standard" quality grade per Renesas documentation, approved only for computers, office equipment, industrial robots, and similar non-safety-critical systems. It is not qualified to AEC-Q101 and lacks the extended temperature range, qualification testing, or traceability required for automotive use.
RD27JS 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:
- -
RD27JS FAQ
1.How can I place an order for RD27JS through Aetrix?
Please submit a Request for Quotation (RFQ) for RD27JS 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 RD27JS reliable?
The price and inventory of RD27JS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD27JS is usually 5 days.
3.What payment methods are accepted for RD27JS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD27JS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD27JS?
RD27JS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD27JS 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 RD27JS?
For technical support, including RD27JS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD27JS requirements.
6.How does Aetrix verify that RD27JS is sourced from the original manufacturer or authorized distributors?
All RD27JS 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 RD27JS meets industry standards.
7.What is the process for return or replacement of RD27JS?
All RD27JS units undergo pre-shipment inspection (PSI). If there is an issue with RD27JS, 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 RD27JS part is unused and in its original packaging.
Return procedure for RD27JS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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