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onsemi BZX85C22_T50A
- Part No.:
- BZX85C22_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C22_T50A.pdf
- Description:
- DIODE ZENER 22V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:4,922
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Product details
Overview
BZX85C22_T50A 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 of −65 °C to +200 °C - used for precision voltage regulation in power supply feedback loops.
For engineers reviewing the BZX85C22_T50A 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
The BZX85C22_T50A operates as a silicon planar Zener diode optimized for stable voltage reference and overvoltage protection in DC power rails. Its 22 V nominal breakdown voltage is specified at IZ = 25 mA with 5% tolerance, and it exhibits low dynamic impedance (10 Ω) under that condition, enabling tight regulation in shunt regulator topologies.
Designed for operation up to +200 °C junction temperature, it supports high-reliability industrial and automotive under-hood applications. The DO-41 glass package provides hermetic sealing and meets JEDEC DO-204AL standards, with cathode indicated by a single color band and lead length standardized at 3/8 inch for thermal measurement consistency.
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 in shunt configuration |
| Power Dissipation (PD) | 1.0 W @ TA = 25 °C - sets maximum continuous dissipation without heatsinking |
| Zener Impedance (ZZ) | 10 Ω @ IZ = 25 mA - determines regulation stiffness against load current variation |
| Leakage Current (IR) | ≤0.5 μA @ VR = 17 V - ensures minimal standby power loss below breakdown |
| Operating Temp Range | −65 °C to +200 °C - enables use in extended-temperature industrial and automotive environments |
| Thermal Derating | 6.67 mW/°C above 50 °C ambient - required linear reduction in power handling for safe operation |
| Forward Voltage (VF) | ≤1.2 V @ IF = 200 mA - confirms standard silicon PN junction conduction behavior |
Pinout & Package
DO-41 glass axial package with cathode identified by a single color band; leads are tinned copper-clad steel, 3/8″ length standardized for thermal testing per datasheet Note 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential side in shunt regulation; reverse-biased relative to cathode during regulation |
| Cathode | Zener breakdown terminal / voltage reference node | Marked by color band; connected to regulated rail; carries full load current when clamping |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Ensures predictable regulation window across production lots without post-assembly trimming |
| Low Zener impedance (10 Ω) | Minimizes output voltage deviation under ±10 mA load transients in feedback networks |
| Hermetically sealed DO-41 glass package | Provides moisture resistance and long-term parameter stability in humid or high-temperature environments |
| High junction temperature rating (+200 °C) | Supports placement near heat-generating components (e.g., power MOSFETs, transformers) without derating |
| Cathode band marking | Enables unambiguous polarity identification during manual assembly and automated optical inspection (AOI) |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference providing precise 22 V threshold to TL431 or optocoupler LED anode. Use Value: Tight 5% VZ tolerance and low ZZ maintain ±1.5% output accuracy across line/load/temperature. |
Use Scenario: Clamping transient surges on 24 V industrial control bus lines exposed to inductive switching noise. IC Role / Device Role / Timing Role: Passive crowbar element diverting excess energy to ground before downstream ICs exceed absolute max ratings. Use Value: 1.0 W power rating and −65 °C to +200 °C operation ensure robustness in factory automation cabinets. |
| Reference Voltage Source | Temperature-Stable Bias Generator |
Use Scenario: Generating stable bias for op-amp input stages in precision analog sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference replacing higher-cost bandgap ICs where 22 V level is acceptable. Use Value: Leakage current ≤0.5 μA at 17 V minimizes error contribution in high-impedance bias networks. |
Use Scenario: Setting fixed current in emitter-degenerated transistor amplifiers operating in automotive engine compartments. IC Role / Device Role / Timing Role: Temperature-compensated bias node leveraging matched TC of Zener and bipolar junctions. Use Value: +200 °C max junction temperature allows direct mounting on heatsinked power stage PCB regions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4745A | 22 V nominal, ±5%, 1.0 W, DO-41, but ZZ = 17 Ω @ 25 mA (vs. 10 Ω for BZX85C22_T50A) | Slightly higher regulation error under dynamic load; same thermal envelope and footprint | Preferred where cost sensitivity outweighs need for lowest possible ZZ |
| MMSZ5247B | 22 V nominal, ±5%, 500 mW, SOD-123 surface-mount, ZZ = 33 Ω @ 20 mA | Not drop-in: requires PCB redesign; lower power rating limits surge handling | Selected only for space-constrained designs accepting reduced power margin and higher impedance |
Compared with 1N4745A and MMSZ5247B, the BZX85C22_T50A delivers superior regulation stiffness (10 Ω vs. 17 Ω/33 Ω) and full 1.0 W capability in a proven through-hole package, making it optimal for legacy industrial power supplies requiring field-serviceable replacement and thermal resilience.
Availability
BZX85C22_T50A is available at Aetrix Electronics and suitable for switch-mode power supply feedback, overvoltage protection clamp, and reference voltage source applications requiring stable component supply across multi-year production cycles.
Supply support for BZX85C22_T50A 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX85C22_T50A belongs to the BZX85C series of general-purpose Zener diodes designed for reliable voltage regulation and transient suppression in cost-sensitive, high-volume industrial and power electronics applications.
FAQ
What is the exact Zener voltage range for BZX85C22_T50A at 25 °C?
The BZX85C22_T50A has a guaranteed Zener voltage range of 20.8 V to 23.3 V at IZ = 25 mA and TA = 25 °C, reflecting its ±5% tolerance specification. This range is measured with the device junction at thermal equilibrium at lead temperature (TL) of 30 °C ± 1 °C using 3/8″ lead length, per onsemi's test methodology documented in the BZX85C3V3–BZX85C56 datasheet Rev. 2.
Does BZX85C22_T50A have a specified thermal resistance (RθJL)?
While the BZX85C22_T50A datasheet does not list RθJL explicitly, its power derating slope of 6.67 mW/°C above 50 °C implies a junction-to-lead thermal resistance of approximately 150 °C/W. This value is derived from ΔP/ΔT = 1.0 W / (150 °C) = 6.67 mW/°C, consistent with typical DO-41 glass package performance and confirmed by onsemi's absolute maximum ratings table.
Can BZX85C22_T50A be used in place of BZX85C24 in a circuit?
No - the BZX85C22_T50A is not interchangeable with BZX85C24 without circuit validation. BZX85C24 specifies 22.8 V to 25.6 V Zener voltage, while BZX85C22_T50A is 20.8 V to 23.3 V. Their 0.5 V overlap at the upper/lower edges does not guarantee functional equivalence; regulation point shift may cause instability in feedback loops or incorrect clamping thresholds.
What is the forward voltage specification for BZX85C22_T50A?
The BZX85C22_T50A has a maximum forward voltage (VF) of 1.2 V at forward current (IF) = 200 mA, as stated in the "VF Forward Voltage" note on page 2 of the onsemi BZX85C3V3–BZX85C56 datasheet. This aligns with standard silicon PN junction characteristics and confirms usability as a rectifier in low-current forward-bias scenarios.
Is BZX85C22_T50A RoHS compliant and halogen-free?
Yes - BZX85C22_T50A is RoHS compliant and halogen-free, as confirmed by onsemi's official product change notices and material declarations. The DO-41 glass package contains no lead in solderable terminations, and all internal materials meet IEC 61249-2-21 and JEDEC J-STD-609A Class 1 requirements, supporting compliance in industrial and medical end equipment.
BZX85C22_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Box (TB)
- 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_T50A FAQ
1.How can I place an order for BZX85C22_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C22_T50A 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_T50A reliable?
The price and inventory of BZX85C22_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C22_T50A is usually 5 days.
3.What payment methods are accepted for BZX85C22_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C22_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C22_T50A?
BZX85C22_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C22_T50A 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_T50A?
For technical support, including BZX85C22_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C22_T50A requirements.
6.How does Aetrix verify that BZX85C22_T50A is sourced from the original manufacturer or authorized distributors?
All BZX85C22_T50A 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_T50A meets industry standards.
7.What is the process for return or replacement of BZX85C22_T50A?
All BZX85C22_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C22_T50A, 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_T50A part is unused and in its original packaging.
Return procedure for BZX85C22_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C22_T50A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
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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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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