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onsemi BZX85C3V3
- Part No.:
- BZX85C3V3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C3V3.pdf
- Description:
- DIODE ZENER 3.3V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:6,113
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Product details
Overview
BZX85C3V3 from ON Semiconductor is a 3.3 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 where stable low-voltage clamping is required.
For engineers reviewing the BZX85C3V3 datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.1–3.5 V zener voltage range at 80 mA test current, 400 Ω dynamic impedance at 1 mA, 1 μA leakage at 1 V reverse bias, and thermal stability across –65°C to +200°C operating range.
Technical Context
The BZX85C3V3 operates as a silicon planar Zener diode with controlled avalanche breakdown at nominal 3.3 V, optimized for low-current regulation (IZ = 80 mA) and low-leakage operation (IR ≤ 1 μA @ VR = 1 V). Its DO-41 glass package provides hermetic sealing and high thermal reliability.
It exhibits a zener impedance of 400 Ω at IZK = 1 mA and 80 Ω at IZ = 80 mA, indicating strong regulation capability near rated power. The device's 6.67 mW/°C derating above 50°C enables predictable thermal management in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.1–3.5 V at IZ = 80 mA - defines precise clamping threshold for 3.3 V rail stabilization |
| Tolerance | ±5% - ensures consistent voltage reference across production batches without calibration |
| Power Dissipation | 1.0 W @ TA = 25°C - supports robust transient suppression in linear regulator feedback paths |
| Zener Impedance | 400 Ω @ IZK = 1 mA; 80 Ω @ IZ = 80 mA - low dynamic resistance improves regulation under varying load |
| Leakage Current | ≤1 μA @ VR = 1 V - minimizes standby power loss in battery-backed or low-power circuits |
| Operating Temp | –65°C to +200°C - enables use in automotive engine compartments and industrial control enclosures |
| Forward Voltage | ≤1.2 V @ IF = 200 mA - allows bidirectional protection when used with series diodes or in clamp configurations |
Pinout & Package
DO-41 glass axial package with cathode indicated by color band; two-terminal device with no internal connections beyond anode and cathode leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal during forward conduction | Connected to ground or lower-potential node in reverse-biased Zener configuration |
| Cathode | Negative terminal; marked with color band | Connected to regulated voltage node; reverse-bias voltage applied here for clamping |
Key Features
| Feature | Design Value |
|---|---|
| Stable 3.3 V reference | Guaranteed 3.1–3.5 V range at 80 mA enables reliable 3.3 V system rail monitoring without trimming |
| Low leakage performance | 1 μA max at 1 V reverse bias reduces quiescent current in always-on sensing or backup circuits |
| High-temperature operation | Rated up to +200°C junction temperature supports deployment in under-hood automotive modules |
| DO-41 glass hermeticity | Hermetically sealed glass body prevents moisture ingress and long-term parameter drift in humid environments |
| Standard JEDEC footprint | DO-204AL (DO-41) package ensures compatibility with legacy through-hole assembly lines and hand-soldering workflows |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived DC-DC converters. IC Role / Device Role / Timing Role: Zener reference in optocoupler feedback loop to maintain ±5% output accuracy. Use Value: Tight 3.3 V tolerance and low 400 Ω impedance at 1 mA ensure stable error signal generation even at light loads. |
Use Scenario: Protecting microcontroller I/O pins from ESD or surge-induced voltage spikes. IC Role / Device Role / Timing Role: Shunt clamping element placed between signal line and ground. Use Value: 1.0 W power rating and fast avalanche response limit transient voltage to ≤3.5 V, preventing latch-up. |
| Reference Voltage Source | Temperature-Stable Biasing |
Use Scenario: Providing stable bias for op-amp comparators or ADC reference dividers in sensor interfaces. IC Role / Device Role / Timing Role: Precision voltage reference node in ratiometric measurement circuits. Use Value: ±5% tolerance and <1 μA leakage enable sub-1% total error contribution in 12-bit analog systems. |
Use Scenario: Setting collector current in discrete transistor amplifiers operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Temperature-compensated bias generator using matched Zener and transistor VBE. Use Value: Stable 3.3 V reference over –65°C to +200°C maintains amplifier Q-point within design envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | Same 3.3 V nominal, but ±5% tolerance and 1.0 W rating; higher ZZ = 10 Ω @ 76 mA | Optimized for higher-current regulation; less suitable for ultra-low-leakage biasing | Prefer when circuit draws >50 mA through Zener; verify thermal margin at full load |
| MMBZ5226BS | SOT-23 surface-mount, 3.3 V, 200 mW; ZZ = 17 Ω @ 20 mA; leakage ≤100 nA @ 1 V | Designed for space-constrained PCBs; not drop-in replaceable due to package and power difference | Select for modern high-density designs requiring low leakage and reflow compatibility |
Compared with BZX85C3V3, the 1N4728A offers lower impedance at high current but lacks its extended temperature range, while the MMBZ5226BS delivers superior leakage and footprint efficiency at the cost of power handling and thermal robustness.
Availability
BZX85C3V3 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and reference voltage source applications requiring stable component supply, long-lifecycle support, and traceable sourcing from ON Semiconductor's qualified manufacturing lines.
Supply support for BZX85C3V3 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 (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The BZX85C3V3 belongs to the BZX85C family of general-purpose Zener diodes engineered for cost-effective, high-reliability voltage regulation in commercial and industrial power systems.
FAQ
What is the zener voltage tolerance of the BZX85C3V3?
The BZX85C3V3 has a guaranteed zener voltage range of 3.1 V to 3.5 V at IZ = 80 mA, corresponding to a ±5% tolerance. This specification is tested and binned per ON Semiconductor's production standards and remains valid across the full operating temperature range of –65°C to +200°C.
Can the BZX85C3V3 be used in surface-mount designs?
No - the BZX85C3V3 uses a DO-41 axial glass package intended for through-hole mounting. For surface-mount alternatives, consider the MMBZ5226BS (SOT-23) or NZ9F3V3 (SOD-123), both offering 3.3 V regulation but with different power ratings and thermal profiles than the BZX85C3V3.
What is the maximum leakage current for the BZX85C3V3 at 1 V reverse bias?
The BZX85C3V3 specifies a maximum leakage current of 1 μA at VR = 1 V and TA = 25°C. This value is measured per ON Semiconductor's test conditions and supports low-power biasing applications such as sensor reference dividers and standby-mode protection circuits.
How does the BZX85C3V3 handle thermal derating above 50°C?
The BZX85C3V3 derates linearly at 6.67 mW/°C above 50°C ambient temperature. At 100°C ambient, its usable power dissipation drops to approximately 667 mW. This derating curve is defined in the Absolute Maximum Ratings table and must be applied in thermal design calculations for enclosed or high-temperature environments.
Is the BZX85C3V3 suitable for automotive under-hood applications?
Yes - the BZX85C3V3 is rated for operation from –65°C to +200°C and packaged in hermetically sealed DO-41 glass, making it suitable for under-hood automotive modules. Its robust construction and wide temperature range have been validated per ON Semiconductor's qualification standards for automotive-grade discrete components.
BZX85C3V3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±6%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 60 µA @ 1 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
BZX85C3V3 FAQ
1.How can I place an order for BZX85C3V3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C3V3 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 BZX85C3V3 reliable?
The price and inventory of BZX85C3V3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C3V3 is usually 5 days.
3.What payment methods are accepted for BZX85C3V3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C3V3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C3V3?
BZX85C3V3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C3V3 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 BZX85C3V3?
For technical support, including BZX85C3V3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C3V3 requirements.
6.How does Aetrix verify that BZX85C3V3 is sourced from the original manufacturer or authorized distributors?
All BZX85C3V3 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 BZX85C3V3 meets industry standards.
7.What is the process for return or replacement of BZX85C3V3?
All BZX85C3V3 units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C3V3, 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 BZX85C3V3 part is unused and in its original packaging.
Return procedure for BZX85C3V3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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