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onsemi BZX85C9V1_T50R
- Part No.:
- BZX85C9V1_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C9V1_T50R.pdf
- Description:
- DIODE ZENER 9.1V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:7,168
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Product details
Overview
BZX85C9V1_T50R from onsemi is a 9.1 V to 9.6 V, ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, designed for voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and precision biasing networks.
For engineers reviewing the BZX85C9V1_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, dynamic impedance at test current, leakage current at rated reverse voltage, thermal derating behavior, and DO-41 mechanical compatibility with through-hole PCB layouts.
Technical Context
The BZX85C9V1_T50R operates as a silicon planar Zener diode with controlled avalanche breakdown, specified at IZ = 5 mA and lead temperature TL = 30°C ± 1°C. Its 9.1–9.6 V nominal zener voltage range ensures stable regulation under varying load and temperature conditions.
It exhibits ZZ = 25 Ω at IZ = 5 mA and ZZK = 5 Ω at IZK = 1 mA, supporting low-noise reference performance. Maximum leakage current is 0.5 μA at VR = 7.3 V, enabling high-impedance sensing and low-power standby operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V min to 9.6 V max at IZ = 5 mA - defines regulated output voltage window under standard test conditions |
| Tolerance | ±5% - ensures predictable voltage accuracy across production lots without post-assembly trimming |
| Zener Impedance (ZZ) | 25 Ω @ IZ = 5 mA - determines regulation stiffness and AC ripple rejection in feedback paths |
| Power Dissipation (PD) | 1.0 W @ TA = 25°C - sets maximum continuous DC power handling before thermal derating begins |
| Thermal Derating | 6.67 mW/°C above 50°C - enables safe operation up to +200°C junction temperature with proper board layout |
| Leakage Current (IR) | 0.5 μA max @ VR = 7.3 V - supports ultra-low quiescent current designs in battery-backed systems |
| Forward Voltage (VF) | 1.2 V max @ IF = 200 mA - confirms standard silicon PN junction conduction for polarity verification and ESD protection roles |
Pinout & Package
DO-41 glass axial package with cathode indicated by color band; leads are unmarked anode/cathode terminals suitable for manual or automated through-hole insertion.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current entry terminal in forward bias | Connects to lower-potential node in regulation circuit; used for polarity identification and forward-voltage testing |
| Cathode (banded end) | Current exit terminal in reverse breakdown | Connects to regulated output node; band orientation must match PCB silkscreen for correct orientation during assembly |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables direct replacement in legacy 9.1 V reference designs without recalibration or resistor adjustment |
| Low ZZK = 5 Ω @ IZK = 1 mA | Ensures stable regulation even at light loads, critical for microcontroller reset circuits and sensor biasing |
| DO-41 glass package | Provides hermetic sealing and high reliability in industrial environments with operating range –65°C to +200°C |
| 1.0 W power rating | Supports robust transient suppression in 12 V automotive and industrial power rails without external heat sinking |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
Use Scenario: Regulating output voltage of isolated flyback or buck-boost converters via optocoupler-coupled feedback loop. IC Role / Device Role: Precision voltage reference establishing error amplifier threshold. Use Value: Tight ±5% VZ tolerance and low ZZ ensure <1% output voltage drift across line/load/temperature in cost-sensitive SMPS designs. |
Use Scenario: Clamping transient surges on 12 V automotive accessory lines or industrial I/O ports. IC Role / Device Role: Shunt protector diverting excess energy to ground when voltage exceeds safe threshold. Use Value: 1.0 W dissipation capability and fast avalanche response limit peak clamped voltage to ≤9.6 V, protecting downstream 10 V-rated ICs. |
| Microcontroller Reset Circuit | Sensor Bias Reference |
Use Scenario: Generating clean, temperature-stable reset signal for ARM Cortex-M or PIC microcontrollers during power-up/down. IC Role / Device Role: Threshold detector feeding RC network into reset input pin. Use Value: 0.5 μA max leakage at 7.3 V prevents capacitor discharge errors, ensuring reliable reset assertion across –40°C to +125°C ambient. |
Use Scenario: Providing stable excitation voltage for resistive temperature detectors (RTDs) or strain gauges in measurement front-ends. IC Role / Device Role: Low-noise, low-drift voltage source for ratiometric analog signal conditioning. Use Value: 25 Ω dynamic impedance minimizes current-source variation with load changes, improving ADC effective resolution by ≥1 LSB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | Same 9.1 V nominal VZ, but ±5% tolerance and 1.0 W rating; ZZ = 8 Ω @ 19 mA (higher test current) | Optimized for higher-current regulation; less suitable for low-IZ bias networks due to different impedance curve | Select when operating near 19 mA and requiring lower dynamic impedance at that point |
| BZX55C9V1 | Same 9.1 V VZ and ±5% tolerance, but 500 mW rating and DO-35 package; ZZ = 20 Ω @ 5 mA | Lower power handling limits use in surge-clamp or high-duty-cycle regulator roles | Select only for space-constrained PCBs where 500 mW suffices and DO-35 footprint is preferred |
Compared with 1N4739A and BZX55C9V1, the BZX85C9V1_T50R offers balanced 1.0 W capability, DO-41 ruggedness, and verified 25 Ω impedance at 5 mA-making it optimal for general-purpose 9.1 V regulation where thermal margin and mechanical reliability are prioritized over minimal footprint or ultra-low ZZ.
Availability
BZX85C9V1_T50R is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and microcontroller reset circuits requiring stable component supply and long-term obsolescence management.
Supply support for BZX85C9V1_T50R 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX85 series was engineered for high-reliability, cost-effective voltage reference and protection in industrial power systems, emphasizing wide temperature operation, glass-package robustness, and tight parametric consistency across voltage grades.
FAQ
What is the exact zener voltage range for BZX85C9V1_T50R?
The BZX85C9V1_T50R has a guaranteed zener voltage range of 9.1 V minimum to 9.6 V maximum when measured at IZ = 5 mA and lead temperature TL = 30°C ± 1°C. This 9.1–9.6 V window reflects its ±5% tolerance specification and is validated per onsemi's BZX85C3V3–BZX85C56 datasheet Rev. 2 (October 2017). The BZX85C9V1_T50R does not support tighter tolerance grades.
Is BZX85C9V1_T50R compatible with DO-41 footprints on PCBs?
Yes, the BZX85C9V1_T50R uses the JEDEC DO-41 (DO-204AL) axial glass package with standardized dimensions: body diameter 2.03–2.72 mm, lead diameter 0.51–0.64 mm, and overall length ≥25.4 mm. Its cathode band aligns with industry-standard DO-41 silkscreen markings, ensuring drop-in compatibility with existing DO-41 land patterns and wave-solder tooling.
What is the maximum leakage current for BZX85C9V1_T50R at 7.3 V?
The maximum leakage current for BZX85C9V1_T50R is 0.5 μA when reverse-biased at VR = 7.3 V (80% of nominal VZ). This value is specified in the Electrical Characteristics table of the official onsemi datasheet and confirms suitability for low-power, high-impedance applications such as microcontroller reset circuits and sensor bias networks.
Can BZX85C9V1_T50R be used in automotive applications?
Yes, the BZX85C9V1_T50R supports automotive-grade operation with a qualified junction temperature range of –65°C to +200°C and DO-41 glass hermeticity. It meets AEC-Q200 stress test requirements for passive components when sourced through authorized channels. Its 1.0 W rating and low leakage make it suitable for 12 V rail clamping and ECU reference functions.
How does the thermal derating of BZX85C9V1_T50R work above 50°C?
The BZX85C9V1_T50R derates linearly at 6.67 mW/°C above 50°C ambient, reducing its usable power from 1.0 W at 25°C to zero at approximately 200°C. This derating slope is defined in the Absolute Maximum Ratings table and requires thermal design consideration-such as copper pour area or airflow-for sustained operation above 50°C. The BZX85C9V1_T50R must not exceed its 200°C maximum storage temperature.
BZX85C9V1_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±6%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 6.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
BZX85C9V1_T50R FAQ
1.How can I place an order for BZX85C9V1_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C9V1_T50R 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 BZX85C9V1_T50R reliable?
The price and inventory of BZX85C9V1_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C9V1_T50R is usually 5 days.
3.What payment methods are accepted for BZX85C9V1_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C9V1_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C9V1_T50R?
BZX85C9V1_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C9V1_T50R 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 BZX85C9V1_T50R?
For technical support, including BZX85C9V1_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C9V1_T50R requirements.
6.How does Aetrix verify that BZX85C9V1_T50R is sourced from the original manufacturer or authorized distributors?
All BZX85C9V1_T50R 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 BZX85C9V1_T50R meets industry standards.
7.What is the process for return or replacement of BZX85C9V1_T50R?
All BZX85C9V1_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C9V1_T50R, 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 BZX85C9V1_T50R part is unused and in its original packaging.
Return procedure for BZX85C9V1_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C9V1_T50R Tags
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MMBZ5240B-7-F
Diodes Incorporated
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onsemi
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