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onsemi BZX85C8V2_T50A
- Part No.:
- BZX85C8V2_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C8V2_T50A.pdf
- Description:
- DIODE ZENER 8.2V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:8,345
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Product details
Overview
BZX85C8V2_T50A from ON Semiconductor is a 8.2 V ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, with 25 Ω zener impedance at 5 mA test current and 0.5 μA max leakage at 6.5 V reverse voltage, used for precision voltage regulation and overvoltage protection in power supply feedback paths.
For engineers reviewing the BZX85C8V2_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, power derating above 50°C, thermal resistance, cathode identification via band marking, and compatibility with through-hole PCB assembly for industrial linear regulators and analog reference circuits.
Technical Context
The BZX85C8V2_T50A operates as a silicon planar Zener diode with sharp reverse breakdown at nominal 8.2 V, specified under thermal equilibrium conditions at 30°C lead temperature and 3/8″ lead length. Its 25 Ω dynamic impedance at IZ = 5 mA ensures stable regulation under moderate load variations.
Designed for DC voltage reference and clamping, it supports continuous operation from –65°C to +200°C, with 6.67 mW/°C linear derating above 50°C ambient and 1.3 W power dissipation at TL = 25°C with 4 mm lead distance from package body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.7–8.7 V at IZ = 5 mA; defines regulated output voltage range in shunt regulator designs |
| Power Dissipation (PD) | 1.0 W @ TA = 25°C; sets maximum continuous power handling without heatsinking |
| Zener Impedance (ZZ) | 25 Ω @ IZ = 5 mA; determines output voltage variation under changing load current |
| Leakage Current (IR) | 0.5 μA max @ VR = 6.5 V; ensures minimal error current in high-impedance reference nodes |
| Operating Temp Range | –65°C to +200°C; enables use in automotive under-hood, industrial motor control, and aerospace environments |
| Forward Voltage (VF) | 1.2 V max @ IF = 200 mA; confirms low-loss conduction in reverse-polarity protection configurations |
Pinout & Package
DO-41 glass axial package with cathode identified by color band on one end; leads are tinned copper-clad steel, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to lower potential node in shunt regulation | Accepts up to 200 mA forward current; must be routed to ground or return path in clamp configuration |
| Cathode | Negative terminal in forward bias; higher-potential node in reverse-biased Zener operation | Marked with band; connects to regulated voltage rail or feedback node in switching power supplies |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-assembly trimming in cost-sensitive consumer and industrial power supplies |
| Low dynamic impedance (25 Ω) | Maintains <±10 mV output shift across 1–10 mA load changes, critical for analog sensor reference stability |
| Hermetically sealed glass package | Provides long-term reliability and moisture resistance in humid or chemically aggressive environments |
| High junction temperature rating (+200°C) | Supports placement near heat-generating components like MOSFETs or transformers without derating penalties |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of 12 V offline flyback converter to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference element setting TL431 cathode voltage threshold for error amplifier activation. Use Value: 8.2 V nominal breakdown provides precise 12 V regulation margin while accommodating ±5% tolerance and thermal drift. |
Use Scenario: Provides stable bias voltage for bridge-based pressure transducer signal conditioning circuitry. IC Role / Device Role / Timing Role: Shunt reference source for instrumentation amplifier input common-mode level setting. Use Value: 0.5 μA leakage at 6.5 V minimizes offset error in high-impedance Wheatstone bridge arms. |
| Overvoltage Clamp for MCU I/O | Automotive Body Control Module Regulator |
Use Scenario: Placed between 5 V microcontroller GPIO line and chassis ground to suppress ESD transients. IC Role / Device Role / Timing Role: Transient voltage suppression device clamping fast-rising spikes above 8.2 V. Use Value: 1.0 W power rating absorbs 2 kV HBM ESD pulses without degradation, validated per AEC-Q101 stress profiles. |
Use Scenario: Regulates 8.2 V rail for LIN transceiver and EEPROM in 12 V vehicle battery system. IC Role / Device Role / Timing Role: Primary shunt regulator supplying clean, low-noise bias to communication ICs. Use Value: –65°C to +200°C operating range meets under-dash thermal requirements without external heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | 8.2 V ±5%, 1.0 W, DO-41, but 7 Ω ZZ @ 25 mA - lower impedance at higher test current | Optimized for higher-current regulation; less stable at sub-5 mA bias points typical in low-power sensor references | Select when load current exceeds 10 mA and tighter dynamic regulation is required |
| BZX55C8V2 | 8.2 V ±5%, 500 mW, DO-35 glass package - 50% lower power rating and smaller thermal mass | Suitable only for signal-level clamping or low-duty-cycle protection; not rated for continuous 1 W dissipation | Choose for space-constrained PCBs where full 1 W capability is unnecessary |
Compared with BZX85C8V2_T50A, the 1N4733A offers better dynamic regulation at higher currents but requires revalidation of low-current stability, while the BZX55C8V2 reduces board area at the expense of thermal robustness and sustained power handling.
Availability
BZX85C8V2_T50A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and precision analog reference circuits requiring stable component supply and long-lifecycle support.
Supply support for BZX85C8V2_T50A 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX85 series was developed for general-purpose voltage regulation and transient suppression in cost-sensitive, high-reliability applications using rugged DO-41 packaging and tight-tolerance Zener characteristics.
FAQ
What is the exact Zener voltage range for BZX85C8V2_T50A?
The BZX85C8V2_T50A has a guaranteed Zener voltage range of 7.7 V to 8.7 V at IZ = 5 mA and TL = 30°C, per ON Semiconductor's datasheet Rev. 2 (October 2017). This ±5% tolerance is measured under thermal equilibrium conditions with 3/8″ lead length and applies across the full operating temperature range.
Does BZX85C8V2_T50A have a cathode band marking?
Yes, BZX85C8V2_T50A uses a visible cathode band on the glass body to identify the cathode terminal, consistent with JEDEC DO-41 standard marking practice. The band is located adjacent to the cathode lead and must be oriented toward the higher-potential node in Zener operation.
What is the maximum allowable power dissipation for BZX85C8V2_T50A at 75°C ambient?
At 75°C ambient, BZX85C8V2_T50A must be derated from its 1.0 W rating at 25°C by 6.67 mW/°C × (75 − 50)°C = 166.75 mW reduction, resulting in a maximum allowable power dissipation of 833 mW. Derating begins at 50°C, not 25°C, per absolute maximum ratings table.
Can BZX85C8V2_T50A be used as a replacement for BZX55C8V2?
No - BZX85C8V2_T50A is not a direct replacement for BZX55C8V2 due to differing power ratings (1.0 W vs. 0.5 W) and thermal design margins. While both share 8.2 V nominal Zener voltage and DO-41/DO-35 mechanical similarity, substituting BZX85C8V2_T50A into a BZX55C8V2 layout may cause overheating if the original design relied on the lower power limit for thermal safety.
What is the forward voltage specification for BZX85C8V2_T50A?
The forward voltage of BZX85C8V2_T50A is specified as 1.2 V maximum at IF = 200 mA, per the "VF Forward Voltage" note on page 2 of the ON Semiconductor datasheet. This parameter validates its suitability for polarity protection and low-loss rectification roles in addition to Zener operation.
BZX85C8V2_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 8.2 V
- Tolerance:
- ±6%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 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
BZX85C8V2_T50A FAQ
1.How can I place an order for BZX85C8V2_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C8V2_T50A 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 BZX85C8V2_T50A reliable?
The price and inventory of BZX85C8V2_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C8V2_T50A is usually 5 days.
3.What payment methods are accepted for BZX85C8V2_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C8V2_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C8V2_T50A?
BZX85C8V2_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C8V2_T50A 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 BZX85C8V2_T50A?
For technical support, including BZX85C8V2_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C8V2_T50A requirements.
6.How does Aetrix verify that BZX85C8V2_T50A is sourced from the original manufacturer or authorized distributors?
All BZX85C8V2_T50A 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 BZX85C8V2_T50A meets industry standards.
7.What is the process for return or replacement of BZX85C8V2_T50A?
All BZX85C8V2_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C8V2_T50A, 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 BZX85C8V2_T50A part is unused and in its original packaging.
Return procedure for BZX85C8V2_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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