My Inquiry
My Account
Renesas RD9.1F-AZ
- Part No.:
- RD9.1F-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD9.1F-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
RD9.1F-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed package, with nominal zener voltage of 9.1 V (B grade: 8.91–9.38 V), dynamic impedance ≤6 Ω at 40 mA, and temperature coefficient +5.5 mV/°C. It serves as a precision voltage reference and surge clamp in power supply regulation and signal conditioning circuits.
For engineers reviewing the RD9.1F-AZ datasheet, RD9.1F-AZ pinout, RD9.1F-AZ application, or RD9.1F-AZ equivalent, this component is evaluated for voltage stabilization, overvoltage protection, and waveform limiting in industrial and consumer-grade power management designs where ±5% zener tolerance and 175°C junction rating are critical selection criteria.
Technical Context
This device operates as a reverse-biased voltage-regulating diode with a planar junction structure and glass-passivated DO-41 package. Its thermal resistance (Rth) is rated at 150°C/W under free-air conditions, and it supports surge reverse power up to 400 W for 10 μs pulses.
The RD9.1F-AZ exhibits a positive zener voltage temperature coefficient (+5.5 mV/°C typical), indicating increasing breakdown voltage with rising temperature - a key behavior for thermal drift compensation in bias networks and reference circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.91–9.38 V at IZ = 40 mA; defines stable regulation range for mid-range voltage references. |
| Power Dissipation (P) | 1.0 W at TA = 25°C; sets maximum continuous DC power handling before thermal derating applies. |
| Dynamic Impedance (ZZ) | ≤6 Ω at IZ = 40 mA; ensures low output impedance for stable regulation under load transients. |
| Zener Temp. Coefficient (γZ) | +5.5 mV/°C typical; quantifies voltage drift per degree Celsius for thermal stability analysis. |
| Reverse Current (IR) | ≤20 μA at VR = 7.3 V; confirms low leakage below breakdown, critical for standby power integrity. |
| Junction Temperature (Tj) | −65 to +175°C; enables operation in high-ambient industrial environments without derating. |
| Surge Reverse Power (PRSM) | 400 W at t = 10 μs; supports transient suppression of short-duration ESD or inductive spikes. |
Pinout & Package
DO-41 glass-sealed axial package with cathode indicated by black band. Leads are tinned and solderable per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to ground or lower potential node in shunt regulator configuration. |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input voltage source and load; maintains stable voltage across load during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range (2–82 V) | Enables standardized BOM consolidation across multiple voltage rails in multi-rail power systems. |
| E24 series nominal values | Supports precise matching to common resistor and capacitor value standards for predictable circuit design. |
| Planar-type DHD structure | Delivers improved reliability and tighter parameter distribution vs. alloy-junction alternatives. |
| 175°C maximum junction temperature | Permits use in thermally constrained enclosures without forced cooling or oversized heatsinking. |
| DO-41 JEDEC compliance | Ensures mechanical compatibility with standard automated insertion and wave-soldering equipment. |
Applications
| Power Supply Voltage Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback node in linear regulator or op-amp reference circuit. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed bias point for error amplifier input. Use Value: Maintains ±1% output regulation accuracy over temperature when paired with low-Z feedback network. |
Use Scenario: Protecting microcontroller I/O pins from ESD or inductive kickback. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping line voltage to safe level. Use Value: Limits peak voltage to ≤9.4 V during 10 μs surges, preventing latch-up or gate oxide damage. |
| Waveform Limiting Circuit | Constant-Current Bias Generator |
Use Scenario: Clipping audio signal peaks in analog preamplifier stage. IC Role / Device Role / Timing Role: Symmetric limiter using back-to-back RD9.1F-AZ diodes. Use Value: Restricts signal swing to ±9.1 V with <10 ns response, preserving harmonic fidelity. |
Use Scenario: Setting bias current for LED driver or transistor amplifier stage. IC Role / Device Role / Timing Role: Current-setting element in constant-current sink topology. Use Value: Delivers stable 40 mA bias current with <0.5% drift over 0–70°C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | Zener voltage 9.1 V (±5%), P = 1 W, ZZ = 8 Ω @ 20 mA, DO-41, γZ = +5.0 mV/°C | Slightly higher dynamic impedance and lower test current; less precise tempco match | Acceptable for non-critical references where cost is prioritized over thermal stability. |
| BZX55-C9V1 | Zener voltage 9.1 V (±5%), P = 500 mW, ZZ = 10 Ω @ 20 mA, DO-35, γZ = +5.2 mV/°C | Half the power rating and smaller DO-35 package; unsuitable for sustained 1 W dissipation | Only suitable for low-power signal-level clamping, not power rail regulation. |
Compared with RD9.1F-AZ, the 1N4739A offers broader distributor availability but looser thermal performance, while the BZX55-C9V1 sacrifices power capability for footprint reduction - making RD9.1F-AZ the optimal choice for 1 W-class industrial voltage references requiring tight tempco control.
Availability
RD9.1F-AZ is available at Aetrix Electronics and suitable for industrial power supplies, consumer appliance control boards, and automotive body electronics requiring stable component supply and long-term obsolescence management.
Supply support for RD9.1F-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 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and discrete power devices.
The RD9.1F-AZ belongs to Renesas' legacy planar Zener diode family designed for general-purpose voltage regulation and transient suppression in Standard-grade applications including office equipment, industrial controls, and consumer electronics.
FAQ
What is the zener voltage tolerance of RD9.1F-AZ?
The RD9.1F-AZ has a B-grade zener voltage specification of 8.91 V minimum to 9.38 V maximum at 40 mA test current, corresponding to ±2.5% tolerance about the nominal 9.1 V value. This tolerance is verified per the D13936EJ5V0DS datasheet and applies under standard 25°C ambient conditions with 40 ms pulse testing. RD9.1F-AZ is not rated for tighter tolerances such as ±1% or ±2% unless explicitly ordered as B1/B2/B3 subgrades.
Does RD9.1F-AZ support surge protection applications?
Yes, RD9.1F-AZ supports surge protection with a rated surge reverse power (PRSM) of 400 W for 10 μs pulses at 25°C, as specified in Figure 7 of the D13936EJ5V0DS datasheet. Its DO-41 glass-sealed construction and planar junction enable robust transient handling, making RD9.1F-AZ suitable for clamping inductive switch-off spikes and ESD events - though external series impedance must be selected to limit peak current within safe operating area limits.
What is the thermal resistance of RD9.1F-AZ?
The RD9.1F-AZ has a junction-to-ambient thermal resistance (RthJA) of 150°C/W under free-air conditions, derived from Figure 2 in the D13936EJ5V0DS datasheet. This value assumes no PCB copper heatsinking; actual thermal performance improves with ≥20 mm² of 1 oz copper pad connected to either lead. RD9.1F-AZ's 175°C maximum junction temperature allows operation up to 125°C ambient when derated per Figure 1's P vs. TA curve.
Is RD9.1F-AZ RoHS compliant?
Yes, RD9.1F-AZ complies with the EU RoHS Directive as confirmed by Renesas Electronics' environmental documentation. The device contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above threshold limits. RoHS status is maintained across all manufacturing lots, and material declarations are available upon request for RD9.1F-AZ through Renesas' official compliance portal.
Can RD9.1F-AZ be used in automotive applications?
RD9.1F-AZ is classified as a "Standard" quality grade device per Renesas' product grading system and is intended for applications including computers, office equipment, and industrial robots - not automotive transportation systems. While RD9.1F-AZ meets basic AEC-Q200 stress test categories in practice, it lacks formal AEC-Q200 qualification and is not recommended for under-hood or safety-critical automotive functions without additional validation and Renesas' written consent.
RD9.1F-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:
- -
RD9.1F-AZ FAQ
1.How can I place an order for RD9.1F-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD9.1F-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 RD9.1F-AZ reliable?
The price and inventory of RD9.1F-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD9.1F-AZ is usually 5 days.
3.What payment methods are accepted for RD9.1F-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD9.1F-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD9.1F-AZ?
RD9.1F-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD9.1F-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 RD9.1F-AZ?
For technical support, including RD9.1F-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD9.1F-AZ requirements.
6.How does Aetrix verify that RD9.1F-AZ is sourced from the original manufacturer or authorized distributors?
All RD9.1F-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 RD9.1F-AZ meets industry standards.
7.What is the process for return or replacement of RD9.1F-AZ?
All RD9.1F-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD9.1F-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 RD9.1F-AZ part is unused and in its original packaging.
Return procedure for RD9.1F-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD9.1F-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…
