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onsemi BZX85C11
- Part No.:
- BZX85C11
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C11.pdf
- Description:
- DIODE ZENER 11V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:23,453
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Product details
Overview
BZX85C11 from onsemi is a 11 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 breakdown voltage and low dynamic impedance are required.
For engineers reviewing the BZX85C11 datasheet, pinout, applications, or equivalent options, key selection criteria include its 10.4–11.6 V zener voltage range at 8 mA test current, 20 Ω zener impedance, 0.5 μA leakage at 8.4 V reverse bias, 1.2 V forward voltage at 200 mA, and DO-41 thermal derating profile (6.67 mW/°C above 50°C).
Technical Context
The BZX85C11 operates as a silicon planar Zener diode with controlled avalanche breakdown at nominal 11 V. Its junction temperature range spans −65 °C to +200 °C, and it maintains specified electrical characteristics only when measured at lead temperature TL = 30 °C ± 1 °C with 3/8″ lead length per ON Semiconductor's test methodology.
It exhibits a typical zener impedance of 20 Ω at IZ = 8 mA and 500 Ω at IZK = 0.5 mA, confirming dual-region regulation capability - stable clamping under moderate current and usable reference behavior down to low knee current. The 1.0 W power rating applies at TA = 25 °C, with linear derating to zero at TJ = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10.4 V min to 11.6 V max at IZ = 8 mA - defines regulation window for feedback or clamp design |
| Zener Impedance (ZZ) | 20 Ω @ IZ = 8 mA - ensures minimal output voltage variation under load changes |
| Knee Impedance (ZZK) | 300 Ω @ IZK = 0.5 mA - supports low-current reference use without excessive drift |
| Leakage Current (IR) | 0.5 μA max @ VR = 8.4 V - enables high-impedance sensing and low-power standby operation |
| Power Dissipation (PD) | 1.0 W @ TA = 25 °C - sets maximum continuous dissipation before thermal derating begins |
| Forward Voltage (VF) | 1.2 V max @ IF = 200 mA - confirms standard silicon diode conduction for polarity verification or dual-use paths |
| Operating Temperature | −65 °C to +200 °C - supports industrial, automotive under-hood, and high-reliability environments |
Pinout & Package
DO-41 glass axial package with cathode indicated by color band; leads are non-polarized except for cathode marking. Standard JEDEC DO-204AL outline with 2.03–2.72 mm body diameter and 5.20 mm minimum lead length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal during forward bias; connected to lower potential in reverse-bias regulation | Provides current path into device during clamping; must be routed to circuit node requiring voltage stabilization |
| Cathode | Negative terminal during forward bias; marked with color band; connected to higher potential in reverse-bias regulation | Serves as regulated output node; ties to feedback divider or protected rail; polarity critical for correct operation |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-assembly trimming in cost-sensitive designs |
| Low zener impedance (20 Ω) | Maintains tight output voltage stability across varying load currents in feedback networks |
| High-temperature operation (up to +200 °C) | Supports deployment in engine control units, industrial motor drives, and enclosed power converters |
| DO-41 glass package | Provides hermetic sealing and long-term parameter stability versus plastic-packaged alternatives |
| Controlled knee characteristics | Allows reliable low-current reference use down to 0.5 mA without abrupt voltage collapse |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converter feedback loop via optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Voltage reference element setting precise trip point for error amplifier input. Use Value: 11 V nominal breakdown enables 12 V output regulation with margin; ±5% tolerance aligns with common 5% output spec. |
Use Scenario: Protecting microcontroller I/O pins or analog sensor inputs from transient surges exceeding 12 V. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess energy to ground when input exceeds safe threshold. Use Value: 20 Ω ZZ ensures rapid response and minimal overshoot; 1.0 W rating handles short-duration transients up to 100 ms. |
| Reference Voltage Source | Current Source Bias Network |
Use Scenario: Generating stable 11 V reference for ADC reference buffer or op-amp biasing in data acquisition front-end. IC Role / Device Role / Timing Role: Precision DC voltage source with low temperature coefficient and noise. Use Value: 0.5 μA leakage at 8.4 V minimizes loading error in high-impedance divider networks; DO-41 stability supports long-term calibration. |
Use Scenario: Setting constant current for LED driver bias or transistor base current in linear regulator pass element. IC Role / Device Role / Timing Role: Voltage-controlled current source node defining emitter/base voltage drop. Use Value: 300 Ω knee impedance allows predictable current setting down to 0.5 mA; forward voltage aids polarity verification during assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A | 10 V nominal, ±5%, 1.0 W, DO-41, ZZ = 20 Ω @ 25 mA - higher test current shifts operating point | Optimized for higher-current regulation; less suitable for low-IZ reference use due to higher knee current | Select when system operates near 25 mA and requires tighter VZ distribution at that current |
| MMBZ5240B | 10 V nominal, ±5%, 350 mW, SOT-23 - surface-mount, lower power, ZZ = 17 Ω @ 20 mA | Designed for space-constrained PCB layouts; not interchangeable without layout revision or thermal redesign | Choose for automated assembly and compact designs where 350 mW dissipation suffices |
Compared with 1N4740A and MMBZ5240B, the BZX85C11 offers superior low-current regulation stability (0.5 mA knee) and higher temperature capability (+200 °C), making it preferred for industrial feedback and high-reliability clamp roles where thermal margin and low-IZ performance are critical.
Availability
BZX85C11 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and precision reference voltage generation requiring stable component supply and long-lifecycle support.
Supply support for BZX85C11 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 manufacturer specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX85C11 belongs to the BZX85C series of general-purpose Zener diodes engineered for robust voltage regulation in cost-sensitive, high-volume power and protection applications across industrial and automotive systems.
FAQ
What is the exact zener voltage range for BZX85C11 at 8 mA test current?
The BZX85C11 has a guaranteed zener voltage range of 10.4 V to 11.6 V when measured at IZ = 8 mA, TL = 30 °C ± 1 °C, and 3/8″ lead length per ON Semiconductor's test specification. This ±5% tolerance is confirmed in the Electrical Characteristics table of the official datasheet (Rev. 2, October 2017). The BZX85C11 must be operated within this range to meet its rated regulation performance.
Can BZX85C11 be used in surface-mount designs?
No - the BZX85C11 is exclusively packaged in the axial DO-41 glass case and is not available in surface-mount variants. For SMT implementation, engineers should consider alternatives like MMBZ5240B (10 V) or BZX84-C11 (SOT-23), which share similar voltage ratings but require PCB layout changes. The BZX85C11 requires through-hole mounting and lead forming per JEDEC DO-204AL mechanical drawings.
What is the maximum allowable junction temperature for BZX85C11?
The BZX85C11 has a specified junction and storage temperature range of −65 °C to +200 °C. Its absolute maximum junction temperature is +200 °C, and thermal derating begins at 50 °C ambient, reducing power dissipation by 6.67 mW/°C. Operation beyond this limit risks permanent parametric shift or catastrophic failure. The BZX85C11 must be thermally managed accordingly in high-ambient environments.
How does BZX85C11 behave at low test currents like 0.5 mA?
At IZK = 0.5 mA, the BZX85C11 exhibits a knee impedance (ZZK) of 300 Ω and maintains regulation down to 8.4 V (75% of nominal VZ). This behavior is documented in the Electrical Characteristics table and enables use in ultra-low-power reference or bias networks. Unlike higher-current Zeners, the BZX85C11 delivers usable regulation even below 1 mA, a key trait of the BZX85C11 family.
Is forward voltage specified for BZX85C11, and what is its value?
Yes - the BZX85C11 specifies a maximum forward voltage (VF) of 1.2 V at forward current IF = 200 mA. This parameter is listed in the "VF Forward Voltage" note on page 2 of the datasheet and is useful for polarity verification during functional testing or for dual-role use in circuits requiring both forward conduction and reverse breakdown. The BZX85C11 behaves as a standard silicon diode in forward bias.
BZX85C11 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 11 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 7.7 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
BZX85C11 FAQ
1.How can I place an order for BZX85C11 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C11 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 BZX85C11 reliable?
The price and inventory of BZX85C11 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C11 is usually 5 days.
3.What payment methods are accepted for BZX85C11?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C11 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C11?
BZX85C11 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C11 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 BZX85C11?
For technical support, including BZX85C11 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C11 requirements.
6.How does Aetrix verify that BZX85C11 is sourced from the original manufacturer or authorized distributors?
All BZX85C11 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 BZX85C11 meets industry standards.
7.What is the process for return or replacement of BZX85C11?
All BZX85C11 units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C11, 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 BZX85C11 part is unused and in its original packaging.
Return procedure for BZX85C11:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C11 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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onsemi
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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