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onsemi BZX85C22
- Part No.:
- BZX85C22
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C22.pdf
- Description:
- DIODE ZENER 22V 1.3W DO41G
- Quantity:
- Payment:
- Shipping:
Inventory:42,520
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Product details
Overview
BZX85C22 from Fairchild Semiconductor is a 22 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 BZX85C22 datasheet, pinout, applications, or equivalent options, this device offers verified Zener voltage (20.8–23.3 V), Zener impedance (10 Ω @ 5 mA), leakage current (0.5 μA max @ 17 V), forward voltage (1.2 V max @ 200 mA), and thermal derating (6.67 mW/°C above 50°C) - all critical for robust analog design and reliability validation.
Technical Context
The BZX85C22 operates as a two-terminal silicon Zener diode with sharp reverse breakdown at nominal 22 V, specified under thermal equilibrium at lead temperature TL = 30°C ±1°C with 3/8″ lead length. Its 1.0 W power dissipation rating at TA = 25°C and 1.3 W at TL = 25°C enables use in medium-power regulation without forced cooling.
It features a DO-41 glass package with cathode band marking, JEDEC DO-204AL compliance, and a maximum operating junction temperature of +200°C. The 5% voltage tolerance and 10 Ω dynamic impedance at IZ = 5 mA support stable reference performance across industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.8–23.3 V at IZ = 5 mA - defines precise regulation threshold for feedback and clamping circuits |
| Power Dissipation (PD) | 1.0 W @ TA = 25°C - sets maximum continuous power handling in ambient-mounted PCB layouts |
| Zener Impedance (ZZ) | 10 Ω @ IZ = 5 mA - ensures minimal output voltage variation under load transients |
| Leakage Current (IR) | 0.5 μA max @ VR = 17 V - guarantees low standby current in high-impedance reference nodes |
| Forward Voltage (VF) | 1.2 V max @ IF = 200 mA - supports bidirectional protection or dual-use in clamp-and-bias configurations |
| Thermal Derating | 6.67 mW/°C above 50°C - determines safe power reduction for operation in elevated ambient environments |
| Operating Temperature | −65°C to +200°C - enables deployment in automotive under-hood, industrial motor control, and aerospace subsystems |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single color band on the body. Leads are tinned copper-clad steel, suitable for wave or hand soldering. Package complies with JEDEC DO-204AL standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to lower-potential node in Zener mode | Accepts up to 200 mA forward current; used for polarity verification or dual-mode circuit design |
| Cathode | Negative terminal in forward bias; connected to higher-potential node in Zener mode | Carries regulated Zener current; marked by visible band; must be biased above anode by ≥22 V for regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-production trimming in cost-sensitive consumer and industrial supplies |
| Low Zener impedance (10 Ω) | Maintains <±25 mV output deviation under ±5 mA load step changes - critical for stable feedback references |
| 1.0 W power rating | Supports direct replacement of legacy 0.5 W Zeners in upgraded designs without heatsink redesign |
| DO-41 glass package | Provides hermetic sealing and superior long-term parameter stability vs. plastic-packaged alternatives |
| −65°C to +200°C operation | Eliminates derating concerns in high-temp environments such as LED drivers, motor controllers, and power converters |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in flyback or buck converter feedback loop via optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Precision voltage reference establishing stable 22 V threshold for error signal generation. Use Value: Tight 5% tolerance and 10 Ω ZZ minimize output drift across line/load/temperature - meeting ±1% output spec without trimming. |
Use Scenario: Clamping transient surges on 24 V DC bus in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Two-terminal shunt protector diverting excess energy when bus exceeds 22 V. Use Value: 1.0 W rating sustains 100 ms surge events per IEC 61000-4-5 Level 3; glass package ensures no parameter shift after repeated clamping. |
| Temperature-Stable Bias Network | Reference Voltage Generator |
Use Scenario: Providing bias current to op-amp input stage in wide-temperature-range sensor signal conditioning. IC Role / Device Role / Timing Role: Low-drift Zener reference setting fixed current through high-value resistor network. Use Value: −65°C to +200°C range and 0.5 μA leakage at 17 V prevent bias current collapse in cold-start or hot ambient conditions. |
Use Scenario: Generating 22 V reference for ADC full-scale calibration in test equipment front-end. IC Role / Device Role / Timing Role: Primary voltage reference source feeding precision resistor divider. Use Value: 5% tolerance and low ZZ ensure reference accuracy remains within 0.1% of nominal across operating current range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5248B | 22 V ±5%, 0.5 W rating, DO-35 package, ZZ = 27 Ω @ 20 mA | Lower power handling and higher impedance limit use in >100 mA regulation or fast transient scenarios | Select when footprint constraints require smaller DO-35 or when 0.5 W suffices and cost is primary driver |
| MMBZ5248B | 22 V ±5%, 0.35 W SOT-23 package, ZZ = 30 Ω @ 20 mA, surface-mount only | Not suitable for through-hole boards or high-power dissipation; lacks DO-41 thermal mass for surge handling | Choose for space-constrained PCBs where reflow compatibility and automated assembly outweigh power needs |
Compared with BZX85C22, the 1N5248B offers identical voltage tolerance but reduced power and higher impedance, while MMBZ5248B trades thermal robustness and mounting flexibility for miniaturization - making BZX85C22 optimal for through-hole, medium-power, thermally demanding applications.
Availability
BZX85C22 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, precision bias networks, and reference voltage generators requiring stable component supply and long-lifecycle availability.
Supply support for BZX85C22 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. Its legacy products remain widely deployed in industrial and automotive systems.
The BZX85C22 belongs to Fairchild's BZX85C series of general-purpose Zener diodes, engineered for reliable voltage regulation and reference in cost-sensitive, high-volume power conversion and protection applications.
FAQ
What is the Zener voltage tolerance for BZX85C22?
The BZX85C22 has a guaranteed Zener voltage range of 20.8 V to 23.3 V at IZ = 5 mA, corresponding to a ±5% tolerance. This specification is measured under thermal equilibrium at lead temperature TL = 30°C ±1°C with 3/8″ lead length, ensuring consistent regulation performance across production lots and operating conditions. The BZX85C22 maintains this tolerance without external trimming.
Can BZX85C22 be used in surface-mount designs?
No, the BZX85C22 is packaged exclusively in the axial DO-41 glass case and requires through-hole mounting. It is not compatible with surface-mount assembly processes. For SMT equivalents, consider the MMBZ5248B (SOT-23) or BZX84C22 (SOT-23), though both differ in power rating, impedance, and thermal behavior compared to the BZX85C22.
What is the maximum leakage current for BZX85C22 at 17 V?
The BZX85C22 specifies a maximum leakage current (IR) of 0.5 μA at reverse voltage (VR) = 17 V and TA = 25°C. This ultra-low leakage ensures minimal error in high-impedance reference circuits and preserves battery life in always-on monitoring systems. The value is confirmed in the Electrical Characteristics table of the Fairchild BZX85C3V3–BZX85C56 datasheet Rev. 1.1.0.
How does thermal derating apply to BZX85C22?
The BZX85C22 must be derated at 6.67 mW/°C above 50°C ambient temperature. Starting from its rated 1.0 W at 25°C, power dissipation linearly decreases to zero at approximately 200°C junction temperature. This derating curve ensures safe operation under sustained thermal stress and is defined in the Absolute Maximum Ratings section of the official datasheet.
Is BZX85C22 suitable for automotive under-hood applications?
Yes, the BZX85C22 supports operation from −65°C to +200°C and is qualified for use in automotive under-hood environments. Its DO-41 glass package provides hermetic sealing and long-term stability under thermal cycling and humidity exposure. However, system-level qualification per AEC-Q101 is not claimed for this legacy Fairchild part, so end-equipment validation remains the responsibility of the designer.
BZX85C22 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 1.3 W
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 16 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41G
BZX85C22 FAQ
1.How can I place an order for BZX85C22 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C22 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 BZX85C22 reliable?
The price and inventory of BZX85C22 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C22 is usually 5 days.
3.What payment methods are accepted for BZX85C22?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C22 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C22?
BZX85C22 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C22 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 BZX85C22?
For technical support, including BZX85C22 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C22 requirements.
6.How does Aetrix verify that BZX85C22 is sourced from the original manufacturer or authorized distributors?
All BZX85C22 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 BZX85C22 meets industry standards.
7.What is the process for return or replacement of BZX85C22?
All BZX85C22 units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C22, 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 BZX85C22 part is unused and in its original packaging.
Return procedure for BZX85C22:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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