My Inquiry
My Account
Renesas RD27JS-AZ
- Part No.:
- RD27JS-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD27JS-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:11,900
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
RD27JS-AZ from Renesas Electronics is a 400 mW, DO-34 glass-sealed Zener diode with nominal zener voltage 27 V (25.2–28.61 V range at 5 mA), low noise performance, sharp breakdown characteristic, and maximum junction temperature of 175 °C - used for precision voltage reference and waveform clipping in industrial power supply regulation circuits.
For engineers reviewing the RD27JS-AZ datasheet, RD27JS-AZ pinout, RD27JS-AZ application, or RD27JS-AZ equivalent, key selection criteria include its E24-standardized Vz tolerance (±5% at Iz = 5 mA), dynamic impedance Zz ≤ 150 Ω, knee impedance Zzk ≤ 150 Ω, and surge reverse power rating of 2.4 W (10 µs pulse) - all critical for stable clamping in transient-prone analog front-ends.
Technical Context
This device implements a silicon planar Zener structure in a double heatsink diode (DHD) configuration within a miniature DO-34 package, enabling efficient thermal dissipation despite its 2.4 mm body length. Its sharp breakdown and low noise stem from controlled doping and junction geometry optimized for stable regulation below 30 V.
The RD27JS-AZ operates with reverse bias only and exhibits a negative temperature coefficient (−γz ≈ −0.02 %/°C at 27 V), requiring thermal compensation in high-precision references. It is rated for storage between −65 °C and +175 °C and supports surge pulses up to 2.4 W for 10 µs without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 25.2–28.61 V at Iz = 5 mA - defines usable regulation window for 27 V nominal reference design |
| Power Dissipation (P) | 400 mW at TA = 25 °C - sets maximum continuous DC power handling before thermal derating |
| Dynamic Impedance (Zz) | ≤150 Ω at Iz = 5 mA - ensures minimal output voltage variation under load current changes |
| Knee Impedance (Zzk) | ≤150 Ω at Iz = 0.5 mA - maintains regulation integrity near knee region for low-current stability |
| Surge Reverse Power (PRSM) | 2.4 W for t = 10 µs - enables robust transient suppression in power rail protection circuits |
| Junction Temperature (Tj) | 175 °C max - determines safe operating margin above ambient in enclosed power modules |
| Reverse Current (IR) | ≤0.1 µA at VR = 21 V - guarantees negligible leakage in high-impedance bias networks |
Pinout & Package
RD27JS-AZ uses a DO-34 axial glass package with cathode indicated by a blue band. The device has two terminals: anode and cathode - no internal connections or multi-pin functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential rail when used in reverse-biased regulation |
| Cathode | Zener breakdown terminal / Output reference node | Provides stabilized 27 V output relative to anode; marked with blue band on DO-34 body |
Key Features
| Feature | Design Value |
|---|---|
| DO-34 glass sealed package | Hermetic sealing ensures long-term parameter stability and moisture resistance in industrial environments |
| Low noise operation | en ≤ 30 µV over 10–500 kHz - minimizes interference in sensitive analog signal chains and sensor interfaces |
| Sharp breakdown characteristic | Well-defined knee at ~25 V enables reliable turn-on in clipping and overvoltage detection circuits |
| E24-standardized Vz | Vz values conform to IEC 60063 E24 series - simplifies BOM standardization across 27 V reference designs |
| DHD (Double Heatsink Diode) construction | Enhanced thermal path reduces junction-to-ambient resistance - supports higher pulse power handling |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing feedback reference in isolated flyback or forward converter auxiliary supplies. IC Role / Device Role / Timing Role: Zener reference diode providing precise 27 V clamp for TL431 or optocoupler biasing. Use Value: Maintains ±5% output accuracy across temperature and load due to low Zz and sharp knee behavior. |
Use Scenario: Clamping transient spikes on 24 V DC control rails in PLC I/O modules. IC Role / Device Role / Timing Role: Passive shunt protector absorbing short-duration surges exceeding 24 V nominal. Use Value: Withstands 2.4 W surges for 10 µs without degradation, protecting downstream logic and ADC inputs. |
| Waveform Clipping in Signal Conditioning | Reference Voltage Source for Analog Sensors |
Use Scenario: Limiting AC audio or sensor signal amplitude to prevent amplifier saturation. IC Role / Device Role / Timing Role: Bidirectional clipping pair (with second diode) or single-ended limiter in op-amp feedback paths. Use Value: Sharp breakdown ensures consistent clipping threshold with minimal hysteresis or distortion. |
Use Scenario: Providing stable excitation voltage for resistive bridge sensors in industrial transmitters. IC Role / Device Role / Timing Role: Low-noise 27 V reference feeding Wheatstone bridge and instrumentation amplifier stages. Use Value: Noise level ≤30 µV prevents signal-to-noise degradation in µV-level bridge outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4750A (ON Semiconductor) | 27 V nominal, ±5% tolerance, 1 W power rating, DO-41 package (larger than DO-34) | Higher power handling but larger footprint; less suitable for space-constrained PCBs | Select when higher continuous power (>400 mW) is required and board area permits DO-41 |
| BZX55-C27 (Vishay) | 27 V nominal, ±5% tolerance, 500 mW rating, DO-35 package (slightly longer than DO-34) | Higher power and comparable noise, but different thermal resistance and marking convention | Prefer when sourcing flexibility across distributors is prioritized and DO-35 layout is acceptable |
Compared with RD27JS-AZ, the 1N4750A offers greater power headroom but requires PCB redesign for DO-41; the BZX55-C27 provides marginally higher power and broader distribution, yet lacks the DHD thermal optimization and exact DO-34 mechanical fit of RD27JS-AZ.
Availability
RD27JS-AZ is available at Aetrix Electronics and suitable for industrial power supply regulation, overvoltage protection circuits, and waveform clipping applications requiring stable component supply, long-term parametric consistency, and RoHS-compliant passive components.
Supply support for RD27JS-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 Japanese semiconductor manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices for industrial and automotive markets.
The RD27JS-AZ belongs to Renesas' legacy DO-34 Zener diode family designed for cost-sensitive, high-reliability voltage reference and protection functions in standard-grade industrial equipment.
FAQ
What is the nominal zener voltage and tolerance of RD27JS-AZ?
The RD27JS-AZ has a nominal zener voltage of 27 V with a tolerance range of 25.2 V to 28.61 V when tested at Iz = 5 mA, per the AB1–AB3 suffix variants defined in the official Renesas datasheet D13937EJ5V0DS00. This corresponds to ±5% tolerance aligned with E24 standard values, ensuring predictable regulation in feedback and reference circuits.
Does RD27JS-AZ support surge protection, and what is its PRSM rating?
Yes, RD27JS-AZ supports non-repetitive surge suppression with a specified Surge Reverse Power (PRSM) rating of 2.4 W at pulse width t = 10 µs, as confirmed in Figure 9 of the Renesas datasheet. This allows the RD27JS-AZ to safely clamp fast transients in 24 V industrial control lines without permanent parameter shift.
What is the package type and marking of RD27JS-AZ?
RD27JS-AZ uses a DO-34 glass axial package with a maximum body length of 2.4 mm and cathode identification via a blue band. The "AZ" suffix denotes a specific manufacturing lot or test grade within the RD27JS series, consistent with Renesas' historical ordering nomenclature for this Zener family.
How does the noise performance of RD27JS-AZ compare to general-purpose Zeners?
RD27JS-AZ delivers low noise performance with en ≤ 30 µV (RMS) over 10–500 kHz, significantly better than typical general-purpose Zeners (often >100 µV). This is achieved via optimized junction design and DHD construction, making RD27JS-AZ suitable for precision analog references where signal integrity is critical.
Is RD27JS-AZ suitable for automotive applications?
No - RD27JS-AZ is classified as a Standard quality grade device per Renesas' documentation, intended for computers, office equipment, and industrial robots. It is not qualified for automotive use (which requires High Quality grade), nor for safety-critical or life-support systems (Specific grade), and lacks AEC-Q200 qualification.
RD27JS-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:
- -
RD27JS-AZ FAQ
1.How can I place an order for RD27JS-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD27JS-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 RD27JS-AZ reliable?
The price and inventory of RD27JS-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD27JS-AZ is usually 5 days.
3.What payment methods are accepted for RD27JS-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD27JS-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD27JS-AZ?
RD27JS-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD27JS-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 RD27JS-AZ?
For technical support, including RD27JS-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD27JS-AZ requirements.
6.How does Aetrix verify that RD27JS-AZ is sourced from the original manufacturer or authorized distributors?
All RD27JS-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 RD27JS-AZ meets industry standards.
7.What is the process for return or replacement of RD27JS-AZ?
All RD27JS-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD27JS-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 RD27JS-AZ part is unused and in its original packaging.
Return procedure for RD27JS-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD27JS-AZ Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
