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Renesas RD9.1F-T7-AZ
- Part No.:
- RD9.1F-T7-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD9.1F-T7-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
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Inventory:5,000
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Product details
Overview
RD9.1F-T7-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 (B grade, ±5.5% tolerance), dynamic impedance 6 Ω at 40 mA, and temperature coefficient +5.5 mV/°C. It serves as a precision voltage reference and surge absorber in power supply regulation and signal conditioning circuits.
For engineers reviewing the RD9.1F-T7-AZ datasheet, RD9.1F-T7-AZ pinout, RD9.1F-T7-AZ application, or RD9.1F-T7-AZ equivalent, this page delivers verified electrical specs, thermal derating curves, real-world clipping/limiting use cases, and cross-compatible alternatives for industrial power rail stabilization and overvoltage protection design.
Technical Context
This device operates as a two-terminal voltage-regulating element relying on controlled reverse-breakdown conduction. Its planar junction structure ensures stable zener characteristics with low dynamic impedance and predictable temperature drift across its 40 mA test current.
The DO-41 package provides axial lead mounting and thermal dissipation capability up to 1 W at 25°C ambient, with derating to zero at 175°C junction temperature. Surge reverse power rating is 400 W for 10 μs pulses, supporting transient suppression in DC power inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V nominal, B grade (8.91–9.38 V range); defines stable regulation point under 40 mA bias. |
| Power Dissipation (P) | 1.0 W at TA = 25°C; usable up to 175°C junction temperature with linear derating. |
| Dynamic Impedance (ZZ) | 6 Ω max at IZ = 40 mA; ensures minimal output voltage shift under load current variation. |
| Reverse Current (IR) | 20 μA max at VR = 7.3 V; guarantees low leakage before breakdown onset. |
| Temp. Coefficient (γZ) | +5.5 mV/°C typical; enables predictable voltage drift compensation in temperature-sensitive references. |
| Surge Power (PRSM) | 400 W for t = 10 μs; supports single-event transient suppression without failure. |
| Junction Temperature (Tj) | −65 to +175°C; allows operation in extended industrial environments including motor drives and HVAC controls. |
Pinout & Package
RD9.1F-T7-AZ uses the JEDEC DO-41 axial glass package (3.0 mm diameter × 5.0 mm length) with cathode indicated by black band. Leads are tinned copper-clad steel, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased regulation configuration. |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node to enable controlled reverse conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range (2–82 V) | Enables standardized BOM coverage across multiple power rail voltages in one family. |
| E24 series nominal values | Ensures compatibility with standard resistor ladder designs and common reference points. |
| Planar-type glass-sealed DHD structure | Delivers consistent breakdown characteristics and long-term stability under thermal cycling. |
| Low dynamic impedance (6 Ω) | Maintains tight regulation (<±0.25 V) across ±10 mA load current changes at 40 mA bias. |
| Positive temperature coefficient (+5.5 mV/°C) | Allows predictable drift modeling for compensated reference circuits in wide-temperature applications. |
Applications
| Power Supply Voltage Reference | Waveform Clipping Circuit |
|---|---|
Use Scenario: Stabilizing +12 V rail in industrial PLC I/O modules using discrete feedback divider. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference for op-amp comparator threshold setting. Use Value: Provides 9.1 V reference with ±5.5% tolerance and <6 Ω source impedance, enabling accurate trip-point detection across −40°C to +85°C. | Use Scenario: Limiting analog sensor output swing to ±10 V before ADC input in data acquisition systems. IC Role / Device Role / Timing Role: Bidirectional clamping pair (two RD9.1F-T7-AZ back-to-back) clips positive/negative excursions beyond safe ADC range. Use Value: Achieves symmetrical 9.1 V clamp level with fast response (<10 ns), preventing ADC saturation and protecting front-end amplifiers. |
| Surge Absorption Circuit | Constant-Current Bias Source |
Use Scenario: Protecting RS-485 transceiver VCC pin from EFT bursts in factory automation networks. IC Role / Device Role / Timing Role: Shunt-connected RD9.1F-T7-AZ diverts transient energy during 4 kV EFT events per IEC 61000-4-4. Use Value: Withstands 400 W surge for 10 μs without degradation, maintaining system uptime and eliminating need for TVS diodes in cost-sensitive designs. | Use Scenario: Generating stable 40 mA bias current for photodiode amplifier in optical smoke detector. IC Role / Device Role / Timing Role: RD9.1F-T7-AZ + series resistor forms simple, temperature-compensated constant-current sink. Use Value: Delivers 40 mA with <±2% variation over −25°C to +70°C due to matched γZ and resistor TCR, ensuring repeatable sensitivity calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | Same 9.1 V nominal, but 10% tolerance (±0.91 V), 10 Ω ZZ, DO-41 package. | Higher voltage uncertainty and impedance reduce regulation accuracy in precision references. | Acceptable for non-critical clamping where cost is primary; not recommended for reference-grade designs. |
| BZX55-C9V1 | 9.1 V nominal, 5% tolerance, 10 Ω ZZ, DO-35 package (smaller, lower PD = 500 mW). | Lower power rating limits surge handling and continuous dissipation in high-current biasing. | Suitable for space-constrained PCBs with <500 mW average dissipation; requires layout review for thermal management. |
Compared with RD9.1F-T7-AZ, 1N4739A trades tighter voltage control for broader availability, while BZX55-C9V1 sacrifices power handling for miniaturization-neither offers the combined 1 W rating, 6 Ω impedance, and +5.5 mV/°C coefficient of RD9.1F-T7-AZ for industrial-grade voltage stabilization.
Availability
RD9.1F-T7-AZ is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface circuits, and surge-protected communication interfaces requiring stable component supply and long-lifecycle support.
Supply support for RD9.1F-T7-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 delivering microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
RD9.1F-T7-AZ belongs to the RD2.0F–RD82F planar zener diode family, engineered for high-reliability voltage regulation and transient suppression in industrial power systems where stable reference accuracy and thermal robustness are critical.
FAQ
What is the exact zener voltage tolerance for RD9.1F-T7-AZ?
The RD9.1F-T7-AZ is specified in the B grade, with a minimum zener voltage of 8.91 V and maximum of 9.38 V at 40 mA test current-equivalent to ±2.9% around the 9.1 V nominal value. This tighter tolerance than standard 5% zeners supports improved accuracy in voltage reference and biasing applications where regulation stability is essential.
Does RD9.1F-T7-AZ support bidirectional clamping?
RD9.1F-T7-AZ is a unidirectional Zener diode optimized for reverse-bias operation. For bidirectional waveform clipping, two RD9.1F-T7-AZ devices must be connected anode-to-anode (back-to-back) to provide symmetrical ±9.1 V limiting. This configuration leverages the device's low dynamic impedance and fast response to protect sensitive analog inputs without adding complexity.
What is the maximum allowable surge pulse duration for RD9.1F-T7-AZ at 400 W?
Per the datasheet Figure 7, RD9.1F-T7-AZ supports a surge reverse power of 400 W only for pulse widths up to 10 μs under non-repetitive conditions. Longer pulses require proportional derating-for example, 100 W at 100 μs-to avoid junction overheating and permanent degradation of the zener characteristic.
How does the +5.5 mV/°C temperature coefficient affect RD9.1F-T7-AZ in a 0–70°C operating range?
With a +5.5 mV/°C coefficient, RD9.1F-T7-AZ exhibits a total zener voltage shift of +385 mV across a 70°C span (70 × 5.5 mV). At 70°C, its voltage rises to approximately 9.485 V-within its specified 9.38 V maximum. This predictable drift enables passive compensation in reference circuits and confirms suitability for applications where moderate thermal drift is acceptable.
Is RD9.1F-T7-AZ RoHS compliant and lead-free?
Yes, RD9.1F-T7-AZ meets EU RoHS Directive requirements and is manufactured as a lead-free device. The "-T7-AZ" suffix denotes RoHS-compliant packaging and termination, with tin-plated leads and halogen-free molding compound-verified per Renesas' environmental compliance documentation and applicable distributor certifications.
RD9.1F-T7-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-T7-AZ FAQ
1.How can I place an order for RD9.1F-T7-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD9.1F-T7-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-T7-AZ reliable?
The price and inventory of RD9.1F-T7-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-T7-AZ is usually 5 days.
3.What payment methods are accepted for RD9.1F-T7-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD9.1F-T7-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD9.1F-T7-AZ?
RD9.1F-T7-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD9.1F-T7-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-T7-AZ?
For technical support, including RD9.1F-T7-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD9.1F-T7-AZ requirements.
6.How does Aetrix verify that RD9.1F-T7-AZ is sourced from the original manufacturer or authorized distributors?
All RD9.1F-T7-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-T7-AZ meets industry standards.
7.What is the process for return or replacement of RD9.1F-T7-AZ?
All RD9.1F-T7-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD9.1F-T7-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-T7-AZ part is unused and in its original packaging.
Return procedure for RD9.1F-T7-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD9.1F-T7-AZ Tags
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