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Renesas RD9.1F-T6-AZ
- Part No.:
- RD9.1F-T6-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD9.1F-T6-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
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Inventory:3,000
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Product details
Overview
RD9.1F-T6-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed DHD package, with nominal zener voltage 9.1 V (B3 grade: 8.91–9.38 V), dynamic impedance ≤6 Ω at 40 mA, and temperature coefficient +5.5 mV/°C. It delivers stable voltage regulation in power supply reference and surge protection circuits for industrial control modules.
For engineers reviewing the RD9.1F-T6-AZ datasheet, RD9.1F-T6-AZ pinout, RD9.1F-T6-AZ application, or RD9.1F-T6-AZ equivalent, this page provides verified electrical specs, thermal derating curves, JEDEC DO-41 terminal mapping, real-world clipping/limiter use cases, and two validated alternative Zeners with documented voltage tolerance and impedance differences.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in a planar-diffused silicon junction. Its 1 W power rating is thermally limited by ambient temperature per Figure 1, with full-rated dissipation only at TA ≤ 50°C and derated linearly to zero at 175°C junction temperature.
The B3 voltage grade ensures tight 8.91–9.38 V tolerance at 40 mA test current, and its +5.5 mV/°C temperature coefficient enables predictable drift compensation in mid-voltage reference designs where positive TC balances negative TC components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.91–9.38 V at IZ = 40 mA - defines regulated output range for precision biasing |
| Dynamic Impedance (ZZ) | ≤6 Ω at IZ = 40 mA - ensures <1% output deviation under ±10 mA load transients |
| Power Dissipation (P) | 1.0 W at TA ≤ 50°C - requires heatsinking or airflow above 50°C ambient |
| Junction Temperature (Tj) | −65 to +175°C - supports operation in industrial enclosures without active cooling |
| Surge Reverse Power (PRSM) | 400 W (t = 10 μs) - clamps ESD and inductive spikes without failure |
| Reverse Current (IR) | ≤20 μA at VR = 7.3 V - guarantees low leakage in high-impedance sensing nodes |
| Temp. Coefficient (γZ) | +5.5 mV/°C - enables TC-matched reference design with complementary components |
Pinout & Package
RD9.1F-T6-AZ uses JEDEC DO-41 glass-sealed axial package (3.0 mm Ø × 5.0 mm max length) with cathode indicated by black band. The device has two terminals: anode and cathode - no internal connections or multi-pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased regulation; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node; sinks regulated current during reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range (2–82 V) | Enables single-family standardization across 41 voltage grades including RD9.1F-T6-AZ |
| E24 series nominal values | Ensures compatibility with standard resistor/capacitor value planning in analog BOMs |
| DHD (Double Heatsink Diode) structure | Improves thermal resistance vs. standard DO-41 - Rth ≈ 120°C/W at S = 10 mm² foil area |
| B3 grade voltage tolerance | ±2.5% (8.91–9.38 V) - tighter than generic 5% Zeners for stable feedback loop references |
| Positive temperature coefficient | +5.5 mV/°C - allows TC cancellation when paired with NTC thermistors or negative-TC ICs |
Applications
| Industrial Power Supply Reference | ESD Protection Clamp |
|---|---|
|
Use Scenario: Regulating +9 V rail in programmable logic controller (PLC) I/O module power stage. IC Role / Device Role / Timing Role: Zener diode providing stable 9.1 V reference for op-amp comparator threshold and ADC bias network. Use Value: Low 6 Ω dynamic impedance maintains <0.06 V error under 10 mA load step, ensuring consistent trip point accuracy. |
Use Scenario: Protecting RS-485 transceiver inputs against ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed between differential bus lines and ground. Use Value: 400 W surge rating at 10 μs pulse absorbs full ESD event energy without degradation or latch-up. |
| Waveform Clipping Circuit | Constant-Current Bias Generator |
|
Use Scenario: Limiting audio signal peaks in analog mixer front-end before ADC sampling. IC Role / Device Role / Timing Role: Dual-diode clipper (with series resistor) shaping input waveform to ±9.1 V envelope. Use Value: Sharp 9.1 V knee and low ZZ ensure clean clipping with minimal harmonic distortion below 20 kHz. |
Use Scenario: Setting precise 10 mA bias current for phototransistor amplifier in optical encoder feedback loop. IC Role / Device Role / Timing Role: Zener-based current source with emitter-follower pass transistor. Use Value: +5.5 mV/°C TC compensates for transistor VBE drift, holding current variation to <±2% over −25 to +70°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5240B | Surface-mount SOD-123, 10 V nominal (9.5–10.5 V), ZZ = 17 Ω @ 20 mA | Requires PCB rework for SMT layout; higher impedance limits dynamic regulation accuracy | Choose for space-constrained designs where DO-41 axial leads are impractical |
| Vishay 1N4739A | DO-41 package, 9.1 V nominal (8.65–9.55 V), ZZ = 8 Ω @ 20 mA, γZ = +4.5 mV/°C | Wider voltage tolerance (±5%) and lower TC reduce reference stability in precision circuits | Acceptable for non-critical biasing where cost and availability outweigh tight TC requirements |
Compared with RD9.1F-T6-AZ, MMBZ5240B trades axial lead compatibility for board space savings but sacrifices regulation fidelity, while 1N4739A matches package form factor but delivers looser voltage tolerance and reduced TC predictability-making RD9.1F-T6-AZ optimal for industrial-grade reference stability.
Availability
RD9.1F-T6-AZ is available at Aetrix Electronics and suitable for industrial control systems, PLC I/O modules, and RS-485 communication interfaces requiring stable component supply with long-term lifecycle support.
Supply support for RD9.1F-T6-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 global semiconductor leader headquartered in Japan, specializing in microcontrollers, analog power devices, and timing solutions for industrial and automotive markets.
RD9.1F-T6-AZ belongs to Renesas' legacy planar Zener diode family designed for high-reliability voltage reference and transient suppression in industrial equipment operating across extended temperature ranges.
FAQ
What is the maximum continuous power dissipation for RD9.1F-T6-AZ at 70°C ambient?
At 70°C ambient, RD9.1F-T6-AZ must be derated per Figure 1 of the datasheet: its maximum continuous power drops to approximately 0.75 W. This is calculated from the linear derating curve starting at 1.0 W at 50°C and reaching 0 W at 175°C junction temperature, resulting in a 6.25 mW/°C slope. Exceeding this limit risks thermal runaway and permanent parameter shift.
Does RD9.1F-T6-AZ have a specified surge current rating beyond the 400 W/10 μs value?
No-RD9.1F-T6-AZ specifies only a single surge reverse power rating: 400 W for a 10 μs pulse at TA = 25°C (Figure 7). Longer pulses or repeated surges require calculation using the transient thermal impedance curve (Figure 8); for example, a 100 μs pulse permits ~120 W based on Zth ≈ 125°C/W at that time constant.
Can RD9.1F-T6-AZ be used in place of RD9.1F without the -T6-AZ suffix?
Yes-RD9.1F-T6-AZ is a Renesas-qualified variant of RD9.1F with identical electrical specifications, DO-41 packaging, and B3 voltage grading. The -T6-AZ suffix denotes tape-and-reel packaging and RoHS-compliant finish per Renesas' internal part numbering convention; all key parameters match the base RD9.1F.
What is the typical reverse leakage current of RD9.1F-T6-AZ at 7.3 V and 25°C?
The typical reverse leakage current (IR) of RD9.1F-T6-AZ is ≤20 μA at VR = 7.3 V and TA = 25°C, as confirmed in the Electrical Characteristics table on page 3 of datasheet D13936EJ5V0DS. This low leakage ensures minimal error in high-impedance voltage divider networks used for sensor biasing.
How does the +5.5 mV/°C temperature coefficient of RD9.1F-T6-AZ affect long-term reference stability?
The +5.5 mV/°C temperature coefficient means RD9.1F-T6-AZ's zener voltage increases by 5.5 mV per degree Celsius rise in junction temperature. Over a 50°C operating range (e.g., −25°C to +25°C), this causes a total drift of ±275 mV - requiring TC compensation in precision references. Its predictability, however, enables accurate modeling and matching with complementary negative-TC elements.
RD9.1F-T6-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-T6-AZ FAQ
1.How can I place an order for RD9.1F-T6-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD9.1F-T6-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-T6-AZ reliable?
The price and inventory of RD9.1F-T6-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-T6-AZ is usually 5 days.
3.What payment methods are accepted for RD9.1F-T6-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD9.1F-T6-AZ transactions.
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4.How is shipping managed for RD9.1F-T6-AZ?
RD9.1F-T6-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD9.1F-T6-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-T6-AZ?
For technical support, including RD9.1F-T6-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD9.1F-T6-AZ requirements.
6.How does Aetrix verify that RD9.1F-T6-AZ is sourced from the original manufacturer or authorized distributors?
All RD9.1F-T6-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-T6-AZ meets industry standards.
7.What is the process for return or replacement of RD9.1F-T6-AZ?
All RD9.1F-T6-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD9.1F-T6-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-T6-AZ part is unused and in its original packaging.
Return procedure for RD9.1F-T6-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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