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onsemi BZX85C22_T50R
- Part No.:
- BZX85C22_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C22_T50R.pdf
- Description:
- DIODE ZENER 22V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:8,780
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Product details
Overview
BZX85C22_T50R from onsemi is a 22 V ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, with zener impedance of 10 Ω at 25 mA test current, leakage current ≤0.5 μA at 17 V reverse voltage, and operating junction temperature range from −65 °C to +200 °C - used for precision voltage regulation in power supply feedback loops.
For engineers reviewing the BZX85C22_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, power derating above 50 °C (6.67 mW/°C), thermal resistance (junction-to-lead), cathode band marking, and DO-41 mechanical compatibility with legacy through-hole PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference, maintaining stable 22 V output across a 5–50 mA dynamic current range. Its zener breakdown mechanism provides predictable reverse conduction with low dynamic impedance (10 Ω @ IZ = 25 mA) and tight 5% voltage tolerance.
The DO-41 glass package enables high-temperature operation up to +200 °C and supports lead temperature-controlled testing per JEDEC standards. Thermal derating begins at 50 °C ambient, with 6.67 mW/°C linear reduction in power dissipation to maintain safe junction temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.8 V min / 23.3 V max at IZ = 25 mA - defines regulated output range under nominal bias |
| Power Dissipation (PD) | 1.0 W @ TA = 25 °C - maximum continuous power before thermal shutdown risk |
| Zener Impedance (ZZ) | 10 Ω @ IZ = 25 mA - low dynamic resistance ensures minimal output voltage variation with load current changes |
| Leakage Current (IR) | ≤0.5 μA @ VR = 17 V - guarantees negligible standby current in high-impedance reference paths |
| Operating Temperature | −65 °C to +200 °C - enables use in automotive engine compartments and industrial motor drives |
| Package | DO-41 glass case with cathode band - standard axial footprint compatible with manual soldering and wave-solder processes |
| Tolerance | ±5% - meets general-purpose regulation requirements without need for post-production trimming |
Pinout & Package
DO-41 glass axial package: cylindrical body with two leads; cathode identified by a single color band near one end. Leads are tinned copper-clad steel, suitable for hand or automated through-hole assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node when used in shunt regulation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to unregulated input; delivers stable 22 V to load when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Stable 22 V reference | Guaranteed 20.8–23.3 V range at 25 mA enables reliable feedback in 24 V SMPS designs |
| Low zener impedance | 10 Ω @ 25 mA minimizes output ripple and improves load regulation vs. higher-Z alternatives |
| High-temperature capability | −65 °C to +200 °C operation supports under-hood automotive and industrial control applications |
| Standard DO-41 footprint | Enables drop-in replacement in existing through-hole designs without layout revision |
| 5% voltage tolerance | Meets cost-sensitive industrial power supply accuracy requirements without laser trimming |
Applications
| Voltage Reference for SMPS Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise 22 V threshold to TL431-like comparator circuits. Use Value: Maintains ±1% output accuracy over line/load/temperature with minimal external components. |
Use Scenario: Clamping transient surges on 24 V DC bus lines in PLC I/O modules. IC Role / Device Role / Timing Role: Passive crowbar element absorbing energy during ESD or inductive kick events. Use Value: Limits peak voltage to 23.3 V, protecting downstream MOSFETs and microcontrollers rated for 25 V abs max. |
| Industrial Sensor Excitation Supply | Legacy Analog Signal Conditioning |
Use Scenario: Providing stable excitation voltage to 4–20 mA current-loop pressure transducers. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing bulkier IC references in space-constrained enclosures. Use Value: Delivers <0.5 μA leakage and <10 Ω impedance to minimize zero-point drift and span error. |
Use Scenario: Biasing op-amp input stages and setting thresholds in analog front-ends of HVAC controllers. IC Role / Device Role / Timing Role: Fixed reference node for comparator hysteresis and ADC reference scaling. Use Value: Enables repeatable 22 V threshold detection with no calibration required across production batches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 22 V ±5%, 1.0 W, DO-41, but higher ZZ = 17 Ω @ 25 mA | Slightly reduced load regulation in high-precision feedback loops | Preferred where legacy 1N-series sourcing is mandated; same footprint and thermal profile |
| BZX55C22 | 22 V ±5%, 500 mW, DO-35 glass, ZZ = 25 Ω @ 20 mA | Lower power rating limits use to <500 mW dissipation; smaller package reduces thermal mass | Selected when board space is constrained and power demand is ≤0.5 W |
Compared with BZX85C22_T50R, 1N4742A offers identical packaging and voltage but trades 7 Ω higher impedance for broader distributor availability, while BZX55C22 sacrifices 500 mW power headroom and thermal robustness for miniaturization - making BZX85C22_T50R optimal for 1 W, high-temp, industrial-grade regulation.
Availability
BZX85C22_T50R is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and sensor interface circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX85C22_T50R 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 supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX85 series was designed for cost-effective, high-reliability voltage regulation in legacy and new industrial power systems - emphasizing thermal stability, wide temperature operation, and DO-41 compatibility with mature manufacturing infrastructure.
FAQ
What is the zener voltage tolerance of BZX85C22_T50R?
The BZX85C22_T50R has a guaranteed zener voltage range of 20.8 V to 23.3 V at 25 mA test current, corresponding to a ±5% tolerance. This specification is verified per the onsemi datasheet Rev. 2 (October 2017) and applies under thermal equilibrium conditions at lead temperature of 30 °C ±1 °C. The BZX85C22_T50R maintains this tolerance across its full operating temperature range.
Can BZX85C22_T50R be used in surface-mount designs?
No - the BZX85C22_T50R uses a DO-41 axial glass package with 0.4–0.6 mm diameter leads intended for through-hole mounting. It lacks SMD-compatible terminations or land patterns. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged Zeners like MMBZ5242B, but note that those differ in power rating, impedance, and thermal behavior versus the BZX85C22_T50R.
What is the maximum allowable reverse voltage before breakdown for BZX85C22_T50R?
The BZX85C22_T50R begins controlled zener breakdown at its specified VZ of 20.8–23.3 V. Below 17 V (the rated VR), leakage current remains ≤0.5 μA. Applying reverse voltage beyond 23.3 V is permissible only within the device's 1.0 W power limit and thermal derating curve - exceeding either risks irreversible damage. The BZX85C22_T50R is not rated for avalanche or transient surge handling beyond its steady-state specs.
How does thermal derating affect BZX85C22_T50R performance above 50 °C?
Above 50 °C ambient, the BZX85C22_T50R must be derated at 6.67 mW/°C - reducing its usable power from 1.0 W at 25 °C to ~867 mW at 70 °C. This linear derating preserves junction temperature safety margins. The BZX85C22_T50R's high +200 °C max junction temperature allows continued operation in hot environments, but designers must recalculate maximum sustainable current (IZ) based on actual board-level thermal resistance.
Is BZX85C22_T50R RoHS compliant and halogen-free?
Yes - the BZX85C22_T50R conforms to RoHS Directive 2011/65/EU and is halogen-free per onsemi's material declarations. The DO-41 glass package contains no lead in solderable terminations, and all internal materials meet JEDEC J-STD-609 moisture sensitivity and environmental compliance standards. Full compliance documentation for BZX85C22_T50R is available via onsemi's product change notifications and material content reports.
BZX85C22_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±6%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 15.5 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
BZX85C22_T50R FAQ
1.How can I place an order for BZX85C22_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C22_T50R 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_T50R reliable?
The price and inventory of BZX85C22_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C22_T50R is usually 5 days.
3.What payment methods are accepted for BZX85C22_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C22_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C22_T50R?
BZX85C22_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C22_T50R 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_T50R?
For technical support, including BZX85C22_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C22_T50R requirements.
6.How does Aetrix verify that BZX85C22_T50R is sourced from the original manufacturer or authorized distributors?
All BZX85C22_T50R 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_T50R meets industry standards.
7.What is the process for return or replacement of BZX85C22_T50R?
All BZX85C22_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C22_T50R, 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_T50R part is unused and in its original packaging.
Return procedure for BZX85C22_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C22_T50R Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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Diodes Incorporated
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Diodes Incorporated
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