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Renesas RD9.1JS-AZ
- Part No.:
- RD9.1JS-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD9.1JS-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
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Inventory:8,400
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Product details
Overview
RD9.1JS-AZ from Renesas Electronics is a 400 mW DO-34 glass-sealed Zener diode with nominal zener voltage 9.1 V (±3.5% tolerance at 5 mA), dynamic impedance ≤15 Ω, and low noise performance optimized for precision voltage reference and waveform clipping applications in industrial control and power supply circuits.
For engineers reviewing the RD9.1JS-AZ datasheet, RD9.1JS-AZ pinout, RD9.1JS-AZ application, or RD9.1JS-AZ equivalent, this page delivers verified electrical specs, package dimensions, thermal behavior, and real-world use context - all confirmed against Renesas' official D13937EJ5V0DS00 datasheet (5th edition, March 1999).
Technical Context
This device operates as a two-terminal voltage regulator using avalanche breakdown in silicon PN junction. Its sharp breakdown characteristic and low knee impedance (Zzk ≤15 Ω at 1 mA) enable stable regulation under varying load and temperature conditions. The DO-34 package provides hermetic glass sealing for long-term reliability in ambient temperatures from –65 °C to +175 °C.
Designed for constant-voltage reference and overvoltage protection, RD9.1JS-AZ exhibits a positive temperature coefficient of +0.04 %/°C (≈3.6 mV/°C) near 9.1 V, making it suitable for temperature-compensated reference designs when paired with negative-TC components. Maximum surge reverse power is 2.4 W for 10 µs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage Vz | 8.56–9.55 V at Iz = 5 mA; ensures ±3.5% regulation accuracy for mid-range voltage references |
| Dynamic Impedance Zz | ≤15 Ω at Iz = 5 mA; minimizes output voltage variation under load current changes |
| Knee Impedance Zzk | ≤15 Ω at Iz = 1 mA; maintains regulation stability even at low bias currents |
| Reverse Current IR | ≤0.5 µA at VR = 6.0 V; guarantees low leakage in high-impedance sensing nodes |
| Power Dissipation P | 400 mW at TA = 25 °C; supports continuous operation in compact PCB layouts with adequate copper area |
| Surge Power PRSM | 2.4 W (10 µs pulse); enables transient overvoltage clamping without device failure |
| Junction Temp Tj | 175 °C max; allows operation in high-temperature industrial environments with proper thermal design |
Pinout & Package
RD9.1JS-AZ uses the DO-34 (JEDEC) axial-leaded glass package: 2.4 mm max body length, 25° cathode band marking (blue), and 0.4 mm lead diameter. Cathode is identified by a blue band on the glass body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; carries forward current up to 150 mA |
| Cathode | Zener breakdown terminal | Marked with blue band; connected to higher-potential node; defines regulated output voltage referenced to anode |
Key Features
| Feature | Design Value |
|---|---|
| Low noise performance | en ≤ 40 µV (10–500 kHz) enables use in precision analog references without added filtering |
| Sharp breakdown characteristic | Defined knee region with Zzk/Zz ratio ≈1 supports clean transition into regulation without soft saturation |
| DO-34 glass seal | Hermetic construction ensures long-term parameter stability and resistance to humidity-induced drift |
| E24-standard Vz grading | Voltage tolerance aligned to E24 series simplifies BOM consolidation across multiple Zener values |
| High surge robustness | 2.4 W non-repetitive surge rating allows single-event transient suppression without derating |
Applications
| Industrial Power Supply Reference | Overvoltage Protection Circuit |
|---|---|
|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter error amplifiers. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing precise 9.1 V threshold for TL431 or optocoupler bias networks. Use Value: Low Zzk ensures minimal error contribution (<0.15%) to overall regulation accuracy at light loads. |
Use Scenario: Clamping input rail transients on microcontroller I/O lines exposed to ESD or inductive kickback. IC Role / Device Role / Timing Role: Passive overvoltage clamp limiting voltage to ≤9.6 V during 10–100 ns surges. Use Value: 2.4 W surge rating absorbs 24 µJ energy per event without degradation, extending system MTBF. |
| Waveform Clipping Stage | Temperature-Compensated Reference |
|
Use Scenario: Symmetric AC signal limiting in audio preamplifier front-ends. IC Role / Device Role / Timing Role: Back-to-back Zener pair (with complementary unit) defining ±9.1 V clipping thresholds. Use Value: Sharp breakdown and low noise prevent harmonic distortion and preserve SNR above 20 kHz. |
Use Scenario: Building a 10 V reference by cascading RD9.1JS-AZ with a 0.9 V forward-biased diode. IC Role / Device Role / Timing Role: Primary Zener element whose +3.6 mV/°C TC offsets negative TC of silicon junction. Use Value: Enables <±50 ppm/°C reference drift over 0–70 °C without active compensation circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | 9.1 V, 1 W, DO-41 package; Zz = 10 Ω at 20 mA; higher power but larger footprint | Preferred where higher surge margin or PCB space permits larger DO-41 body | Select when >400 mW continuous dissipation is required or legacy DO-41 layout exists |
| BZX55-C9V1 | 9.1 V, 500 mW, DO-35 package; Zz = 15 Ω at 5 mA; plastic encapsulation, RoHS-compliant | Used where moisture resistance is less critical and RoHS compliance is mandatory | Choose for cost-sensitive consumer designs requiring lead-free assembly and JEDEC DO-35 compatibility |
Compared with RD9.1JS-AZ, 1N4739A offers higher power handling but requires board rework for DO-41 pads, while BZX55-C9V1 trades glass-seal reliability for RoHS compliance and slightly higher power - neither is pin-compatible due to differing DO-34 vs. DO-41/DO-35 form factors.
Availability
RD9.1JS-AZ is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, waveform clipping stages, and temperature-compensated reference designs requiring stable component supply with full traceability and lifecycle support.
Supply support for RD9.1JS-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 specializing in microcontrollers, analog and power devices, and SoC solutions for industrial, automotive, and infrastructure markets.
The RDx.xJS series was developed by Renesas (formerly NEC) as a family of precision, low-noise, glass-sealed Zener diodes targeting voltage reference and protection functions in high-reliability industrial equipment.
FAQ
What is the exact zener voltage tolerance for RD9.1JS-AZ at 5 mA?
The RD9.1JS-AZ has a specified zener voltage range of 8.56 V to 9.55 V at test current Iz = 5 mA, corresponding to ±3.5% tolerance about the nominal 9.1 V value. This grading is confirmed in Table on page 2 of Renesas datasheet D13937EJ5V0DS00, and applies specifically to the AB1/AB2/AB3 suffix variants under pulse testing (40 ms).
Does RD9.1JS-AZ have a cathode band, and how is polarity marked?
Yes, RD9.1JS-AZ uses a blue cathode band on the glass body to indicate polarity, consistent with DO-34 JEDEC standard. The cathode terminal is the lead adjacent to the blue band; the anode is the opposite lead. This marking is shown in the "PACKAGE DIMENSIONS" diagram on page 2 of the official Renesas datasheet.
What is the maximum allowable surge reverse power for RD9.1JS-AZ?
The RD9.1JS-AZ supports a non-repetitive surge reverse power of 2.4 W for pulse width t = 10 µs, as defined in the Absolute Maximum Ratings table (page 2) and illustrated in Fig. 9 of the Renesas datasheet D13937EJ5V0DS00. This rating assumes single-event application and does not apply to repetitive surges.
Is RD9.1JS-AZ suitable for use in automotive applications?
No - RD9.1JS-AZ is classified as a Standard-grade Renesas product intended for computers, office equipment, industrial robots, and similar applications. It is not qualified for automotive use (which requires High Quality grade per Renesas' quality classification system in Section 7 of the datasheet), and lacks AEC-Q200 qualification or extended temperature validation beyond –65 °C to +175 °C.
How does the noise performance of RD9.1JS-AZ compare to general-purpose Zeners?
RD9.1JS-AZ delivers ≤40 µV RMS noise (10–500 kHz) at Vz = 9.1 V, significantly lower than typical general-purpose Zeners (often >100 µV). This low-noise trait is explicitly highlighted in Fig. 8 of the Renesas datasheet and results from optimized DHD (Double Heatsink Diode) construction and controlled junction geometry - critical for precision analog references.
RD9.1JS-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:
- -
RD9.1JS-AZ FAQ
1.How can I place an order for RD9.1JS-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD9.1JS-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 RD9.1JS-AZ reliable?
The price and inventory of RD9.1JS-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD9.1JS-AZ is usually 5 days.
3.What payment methods are accepted for RD9.1JS-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD9.1JS-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD9.1JS-AZ?
RD9.1JS-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD9.1JS-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 RD9.1JS-AZ?
For technical support, including RD9.1JS-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD9.1JS-AZ requirements.
6.How does Aetrix verify that RD9.1JS-AZ is sourced from the original manufacturer or authorized distributors?
All RD9.1JS-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 RD9.1JS-AZ meets industry standards.
7.What is the process for return or replacement of RD9.1JS-AZ?
All RD9.1JS-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD9.1JS-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 RD9.1JS-AZ part is unused and in its original packaging.
Return procedure for RD9.1JS-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD9.1JS-AZ Tags
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