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onsemi BZX85C3V6
- Part No.:
- BZX85C3V6
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C3V6.pdf
- Description:
- DIODE ZENER 3.6V 1.3W DO41G
- Quantity:
- Payment:
- Shipping:
Inventory:11,890
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Product details
Overview
BZX85C3V6 from Fairchild Semiconductor is a 3.6 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 BZX85C3V6 datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy at 5 mA test current, low dynamic impedance (60 Ω @ 5 mA), leakage current ≤1 μA at 1 V reverse bias, and thermal stability across -65°C to +200°C operating range.
Technical Context
The BZX85C3V6 operates as a silicon planar Zener diode with sharp reverse breakdown at nominal 3.6 V, specified under thermal equilibrium conditions at 30°C lead temperature and 3/8″ lead length. Its 5% tolerance and 60 Ω dynamic impedance support stable regulation in low-power analog references.
It features a DO-41 glass-encapsulated axial package with cathode band marking, rated for 1.0 W power dissipation at 25°C ambient and derated linearly above 50°C (6.67 mW/°C). Forward voltage is ≤1.2 V at 200 mA forward current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.4 V to 3.8 V at IZ = 5 mA - defines precise regulation window for low-voltage reference circuits |
| Tolerance | ±5% - ensures predictable voltage clamping without post-selection trimming |
| Zener Impedance (ZZ) | 60 Ω @ IZ = 5 mA - enables stable output under varying load currents in feedback paths |
| Power Dissipation (PD) | 1.0 W @ TA = 25°C - supports continuous operation in compact PCB layouts with natural convection cooling |
| Leakage Current (IR) | ≤1 μA @ VR = 1 V - minimizes error current in high-impedance reference nodes |
| Operating Temperature | -65°C to +200°C - suitable for automotive under-hood and industrial control environments |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single color band on the body. Leads are tinned copper-clad steel, compatible with wave and hand soldering per JEDEC DO-204AL standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in shunt regulator | Connected to ground or lower potential node; carries full load current during regulation |
| Cathode | Zener breakdown terminal / high-side connection in shunt regulator | Connected to input or regulated rail; maintains fixed voltage drop relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage at low test current | Specified at IZ = 5 mA - enables reliable operation with minimal bias current in battery-powered systems |
| Low dynamic impedance | 60 Ω - reduces output voltage variation under load transients in feedback networks |
| Hermetic glass encapsulation | DO-41 package - provides moisture resistance and long-term parameter stability vs. plastic alternatives |
| Wide temperature range | -65°C to +200°C - supports deployment in extreme ambient conditions without derating penalties |
Applications
| Switch-Mode Power Supply Feedback | Microcontroller Voltage Reference |
|---|---|
Use Scenario: Provides precise 3.6 V reference for optocoupler-based feedback in offline AC/DC converters. IC Role / Device Role / Timing Role: Shunt voltage reference in secondary-side regulation loop. Use Value: Enables ±5% output voltage accuracy without external trimming, leveraging tight VZ tolerance and low ZZ. |
Use Scenario: Supplies stable bias voltage to ADC reference input or reset supervisor threshold in low-power MCU designs. IC Role / Device Role / Timing Role: Precision DC voltage source for analog subsystems. Use Value: Delivers <1 μA leakage at 1 V reverse bias, minimizing loading error on high-impedance reference nodes. |
| Overvoltage Clamp for GPIO Protection | Industrial Sensor Signal Conditioning |
Use Scenario: Clamps 3.3 V digital I/O lines against ESD or surge events exceeding 3.6 V. IC Role / Device Role / Timing Role: Transient voltage suppressor in parallel with protected node. Use Value: Responds within nanoseconds to limit voltage excursion, supported by fast junction response and DO-41 thermal mass. |
Use Scenario: Sets bias point for 4–20 mA transmitter front-end op-amps operating from 24 V rails. IC Role / Device Role / Timing Role: Stable excitation reference for current-loop scaling resistors. Use Value: Maintains regulation across -40°C to +85°C industrial temperature range with <0.1%/°C drift implied by 200°C max TJ rating. |
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 3.6 V nominal, but ±5% tolerance and 1.0 W rating; higher ZZ = 9 Ω @ 20 mA (vs. BZX85C3V6's 60 Ω @ 5 mA) | Optimized for higher test current; less suitable for ultra-low-bias circuits | Select when higher test current is available and lower dynamic impedance at 20 mA is required |
| BZX55C3V6 | Same 3.6 V, ±5%, DO-35 package; lower PD = 500 mW and higher ZZ = 100 Ω @ 5 mA | Smaller footprint but reduced power handling and regulation stability | Select for space-constrained boards where 0.5 W dissipation suffices |
Compared with 1N4728A and BZX55C3V6, the BZX85C3V6 offers superior thermal robustness (200°C max TJ vs. 175°C) and tighter low-current regulation performance, making it preferred for high-reliability industrial and automotive voltage reference roles.
Availability
BZX85C3V6 is available at Aetrix Electronics and suitable for switch-mode power supply feedback, microcontroller voltage reference, and overvoltage clamp applications requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for BZX85C3V6 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 BZX85 series was developed for general-purpose Zener regulation in cost-sensitive, high-volume industrial and consumer applications, emphasizing reliability, wide temperature operation, and DO-41 compatibility.
FAQ
What is the exact zener voltage range for BZX85C3V6?
The BZX85C3V6 has a guaranteed zener voltage range of 3.4 V to 3.8 V when measured at 5 mA test current and thermal equilibrium at 30°C lead temperature, per Fairchild's Rev. 1.1.0 datasheet. This 5% tolerance window ensures predictable clamping behavior in production circuits without binning.
Is BZX85C3V6 suitable for surface-mount assembly?
No, the BZX85C3V6 uses a DO-41 axial glass package with 0.4" lead spacing and is intended for through-hole mounting only. It is not compatible with reflow or wave soldering processes used for SMT components. For SMT equivalents, consider SOD-123 or SOD-323 packaged Zeners with matching electrical specs.
What is the maximum reverse leakage current for BZX85C3V6?
The BZX85C3V6 exhibits ≤1 μA reverse leakage current at 1 V applied reverse voltage (VR), as specified in the Electrical Characteristics table. This low leakage supports accurate biasing in high-impedance analog circuits where error current must be minimized.
How does BZX85C3V6 handle thermal derating above 50°C?
The BZX85C3V6 must be derated at 6.67 mW/°C above 50°C ambient temperature. At 75°C, its usable power dissipation drops to 1.0 W − (25 × 6.67 mW) = 833 mW. This linear derating ensures safe junction temperatures up to the 200°C maximum rating.
Can BZX85C3V6 be used as a substitute for BZX55C3V6?
The BZX85C3V6 can serve as a functional alternative to BZX55C3V6 in many applications, but with key differences: it offers higher power rating (1.0 W vs. 0.5 W), lower dynamic impedance (60 Ω vs. 100 Ω), and extended temperature range (−65°C to +200°C vs. −65°C to +175°C). PCB layout changes are required due to DO-41 vs. DO-35 footprint mismatch.
BZX85C3V6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 1.3 W
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 20 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41G
BZX85C3V6 FAQ
1.How can I place an order for BZX85C3V6 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C3V6 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 BZX85C3V6 reliable?
The price and inventory of BZX85C3V6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C3V6 is usually 5 days.
3.What payment methods are accepted for BZX85C3V6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C3V6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C3V6?
BZX85C3V6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C3V6 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 BZX85C3V6?
For technical support, including BZX85C3V6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C3V6 requirements.
6.How does Aetrix verify that BZX85C3V6 is sourced from the original manufacturer or authorized distributors?
All BZX85C3V6 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 BZX85C3V6 meets industry standards.
7.What is the process for return or replacement of BZX85C3V6?
All BZX85C3V6 units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C3V6, 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 BZX85C3V6 part is unused and in its original packaging.
Return procedure for BZX85C3V6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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