My Inquiry
My Account
onsemi BZX85C8V2
- Part No.:
- BZX85C8V2
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C8V2.pdf
- Description:
- DIODE ZENER 8.2V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:35,888
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX85C8V2 from Fairchild 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, 0.5 μA max leakage at 6.5 V reverse voltage, and operating temperature range of –65°C to +200°C - used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the BZX85C8V2 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode identification, DO-41 mechanical dimensions, and direct alternative options for industrial voltage reference design.
Technical Context
The BZX85C8V2 operates as a silicon planar Zener diode with sharp reverse breakdown at nominal 8.2 V, characterized under thermal equilibrium at 30°C lead temperature using 3/8″ lead length per JEDEC test method. Its 25 Ω dynamic impedance at IZ = 5 mA ensures stable regulation under moderate load variation.
Designed for DC voltage reference and clamping, it supports continuous operation up to 1.0 W at 25°C ambient, with linear 6.67 mW/°C derating above 50°C and full functionality across –65°C to +200°C junction/storage range - enabling use in automotive engine control modules and industrial power converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.7–8.7 V at IZ = 5 mA; defines regulated output voltage window under standard test conditions |
| Zener Impedance (ZZ) | 25 Ω @ IZ = 5 mA; determines output voltage deviation under load current changes |
| Power Dissipation (PD) | 1.0 W @ TA = 25°C; sets maximum steady-state power handling before thermal shutdown risk |
| Leakage Current (IR) | 0.5 μA max @ VR = 6.5 V; ensures minimal standby current in high-impedance bias networks |
| Operating Temperature | –65°C to +200°C; enables deployment in under-hood automotive and downhole industrial environments |
| Forward Voltage (VF) | 1.2 V max @ IF = 200 mA; confirms low-loss conduction in series protection configurations |
| Tolerance | ±5%; specifies initial calibration accuracy without external trimming |
Pinout & Package
DO-41 glass axial package with cathode indicated by color band on body; two-terminal device with no internal connections beyond anode and cathode leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential node when used as voltage clamp or regulator |
| Cathode | Current exit terminal in forward bias; Zener breakdown terminal in reverse bias | Marked by color band; connected to regulated output node in shunt regulator topology |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage | 8.2 V nominal with ±5% tolerance maintained across full temperature range |
| Low dynamic impedance | 25 Ω at 5 mA enables <10 mV output shift for ±10 mA load transients |
| High-temperature operation | Rated to +200°C junction temperature supports under-hood and motor-drive applications |
| Hermetic glass package | DO-41 glass case provides moisture resistance and long-term parameter stability |
| Controlled leakage | 0.5 μA max at 6.5 V ensures negligible error in high-impedance reference dividers |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converter via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 8.2 V threshold to TL431 or optocoupler LED drive circuit. Use Value: Maintains ±1% output regulation despite line/load variation due to low ZZ and tight VZ tolerance. |
Use Scenario: Protects 3.3 V or 5 V GPIO pins from ESD or transient overvoltage events. IC Role / Device Role / Timing Role: Clamping diode placed between I/O line and ground, conducting above 8.2 V. Use Value: Limits pin voltage to safe level while drawing <1 μA leakage at normal operating voltage. |
| Industrial Sensor Signal Conditioning | Programmable Voltage Reference for ADC Biasing |
Use Scenario: Stabilizes excitation voltage for resistive bridge sensors in process control transmitters. IC Role / Device Role / Timing Role: Precision shunt reference supplying fixed 8.2 V to Wheatstone bridge. Use Value: Enables 12-bit measurement resolution by minimizing reference drift over –40°C to +85°C. |
Use Scenario: Sets mid-scale reference point for single-supply 10-bit SAR ADC in data acquisition module. IC Role / Device Role / Timing Role: Buffered Zener source feeding op-amp input stage to generate stable 4.1 V bias. Use Value: Reduces ADC offset error to <±2 LSB through low-impedance, low-drift 8.2 V source. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4738A | 8.2 V ±5%, 1.0 W, DO-41, ZZ = 5 Ω @ 20 mA - lower impedance but higher test current | Requires higher bias current (20 mA vs. 5 mA) to achieve rated ZZ, increasing quiescent power | Select when tighter regulation under heavy load is prioritized over low-current operation |
| MMBZ5238B | 8.2 V ±5%, 350 mW, SOT-23, ZZ = 30 Ω @ 20 mA - surface-mount, lower power rating | Not suitable for >350 mW dissipation; requires PCB layout change and thermal pad design | Choose for space-constrained PCBs where board area outweighs power capability trade-off |
Compared with BZX85C8V2, the 1N4738A offers lower dynamic impedance but demands higher operating current, while the MMBZ5238B enables miniaturization at the cost of thermal headroom and through-hole compatibility.
Availability
BZX85C8V2 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, and embedded system voltage supervision requiring stable component supply and long-lifecycle availability.
Supply support for BZX85C8V2 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The BZX85C8V2 belongs to Fairchild's legacy BZX85C series of general-purpose Zener diodes engineered for robust voltage regulation in cost-sensitive industrial and automotive systems.
FAQ
What is the exact Zener voltage tolerance for BZX85C8V2?
The BZX85C8V2 has a guaranteed Zener voltage range of 7.7 V to 8.7 V at 5 mA test current, corresponding to ±5% tolerance about the nominal 8.2 V rating. This tolerance is specified at TA = 25°C and remains valid across the full –65°C to +200°C operating temperature range per the official Fairchild datasheet Rev. 1.1.0.
Can BZX85C8V2 be used in surface-mount designs?
No - the BZX85C8V2 is packaged exclusively in the axial DO-41 glass case and requires through-hole mounting. For surface-mount equivalents, consider the MMBZ5238B (SOT-23) or BZX84-C8V2 (SOT-23), both offering similar 8.2 V regulation but differing in power rating and thermal performance. The BZX85C8V2 itself cannot be soldered to SMT pads without mechanical adaptation.
What is the maximum reverse leakage current for BZX85C8V2 at 6.5 V?
The maximum reverse leakage current for BZX85C8V2 is 0.5 μA at VR = 6.5 V and TA = 25°C, as confirmed in the Electrical Characteristics table of the Fairchild BZX85C3V3–BZX85C56 datasheet. This low leakage ensures minimal error contribution in high-impedance voltage divider or reference circuits.
How does thermal derating apply to BZX85C8V2 above 50°C?
BZX85C8V2 must be derated linearly at 6.67 mW/°C above 50°C ambient temperature. Starting from its full 1.0 W rating at 25°C, usable power drops to approximately 933 mW at 60°C and 800 mW at 80°C. This derating ensures junction temperature stays within the –65°C to +200°C limit under continuous operation.
Is BZX85C8V2 suitable for automotive under-hood applications?
Yes - the BZX85C8V2 is rated for junction temperatures up to +200°C and storage down to –65°C, meeting extended temperature requirements for engine control units and transmission modules. Its DO-41 glass package provides hermetic sealing against humidity and contaminants, supporting AEC-Q200 stress testing when qualified by the manufacturer.
BZX85C8V2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.2 V
- Tolerance:
- ±5%
- 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
BZX85C8V2 FAQ
1.How can I place an order for BZX85C8V2 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C8V2 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 reliable?
The price and inventory of BZX85C8V2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C8V2 is usually 5 days.
3.What payment methods are accepted for BZX85C8V2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C8V2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C8V2?
BZX85C8V2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C8V2 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?
For technical support, including BZX85C8V2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C8V2 requirements.
6.How does Aetrix verify that BZX85C8V2 is sourced from the original manufacturer or authorized distributors?
All BZX85C8V2 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 meets industry standards.
7.What is the process for return or replacement of BZX85C8V2?
All BZX85C8V2 units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C8V2, 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 part is unused and in its original packaging.
Return procedure for BZX85C8V2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C8V2 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
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
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…
