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onsemi BZX79C22_T50R
- Part No.:
- BZX79C22_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C22_T50R.pdf
- Description:
- DIODE ZENER 22V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:3,460
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Product details
Overview
BZX79C22_T50R from ON Semiconductor is a 22 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 55 Ω dynamic impedance at 5 mA test current and 0.05 μA maximum leakage at 16.8 V reverse voltage. It provides precise voltage regulation in low-power reference and protection circuits.
For engineers reviewing the BZX79C22_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating (4.0 mW/°C above 75°C), cathode identification via color band, junction temperature range (–65°C to +200°C), and DO-35 mechanical compatibility.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load or supply conditions. Its 22 V nominal zener voltage is specified at 5 mA test current with ±5% tolerance, and it exhibits a positive temperature coefficient of +16.4 mV/°C - enabling predictable drift compensation in temperature-sensitive references.
The device uses a planar epitaxial construction in a hermetically sealed DO-35 glass package with axial leads. Cathode is marked by a single black band; forward voltage is ≤1.5 V at 100 mA, confirming standard silicon PN junction behavior distinct from Schottky or TVS devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.8 V min / 23.3 V max at IZ = 5 mA - defines usable regulation window for precision biasing |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power before thermal derating begins |
| Dynamic Impedance (ZZ) | 55 Ω max at IZ = 5 mA - determines output voltage stability under small-signal load variation |
| Leakage Current (IR) | 0.05 μA max at VR = 16.8 V - ensures minimal standby current in high-impedance sensing nodes |
| Temperature Coefficient (TC) | +16.4 mV/°C - quantifies voltage drift per degree Celsius for thermal design margining |
| Junction Temp Range | –65°C to +200°C - supports operation in automotive under-hood and industrial motor control environments |
| Package | DO-35 glass axial - enables manual soldering, wave soldering, and legacy PCB footprint compatibility |
Pinout & Package
DO-35 glass package with axial leads: cathode identified by single black band; anode is unmarked lead. Leads are tinned copper-clad steel, 0.46 mm diameter, 25.4 mm minimum length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference node | Connected to lower-potential side in shunt regulator configuration; carries full load current during regulation |
| Cathode | Zener breakdown terminal / Voltage reference output | Marked with black band; connected to regulated voltage rail; referenced to system ground in most applications |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables use in cost-sensitive voltage references without trimming circuitry |
| Hermetic DO-35 glass package | Provides long-term reliability in humid or chemically aggressive environments |
| Low leakage (0.05 μA) | Minimizes error in high-impedance feedback networks and battery-powered sensors |
| Controlled temperature coefficient (+16.4 mV/°C) | Allows predictable compensation when paired with negative-TC components |
| 500 mW power rating with linear derating | Supports robust transient energy absorption in overvoltage clamp configurations |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stable 22 V reference for analog-to-digital converter (ADC) biasing in industrial data acquisition modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed potential to ADC reference input and op-amp bias networks. Use Value: Maintains <±0.5% reference accuracy over –40°C to +85°C ambient due to known TC and low ZZ. | Use Scenario: Protection of microcontroller I/O pins against ESD-induced transients on 24 V sensor lines. IC Role / Device Role / Timing Role: Passive clamping element diverting surge current away from sensitive CMOS inputs. Use Value: Limits voltage excursion to ≤23.3 V during 1 kV HBM events while dissipating <500 mW peak energy. |
| Voltage Monitor Threshold | Current Source Bias |
Use Scenario: Undervoltage lockout (UVLO) detection in 24 V DC power supplies for factory automation controllers. IC Role / Device Role / Timing Role: Zener-based comparator input threshold set to 22 V ±5%, triggering shutdown below safe operating level. Use Value: Provides deterministic trip point with <1% hysteresis when combined with LM393 comparator and pull-up resistor. | Use Scenario: Constant-current source for LED indicator arrays in medical diagnostic equipment front panels. IC Role / Device Role / Timing Role: Voltage reference in emitter-degenerated BJT current mirror topology. Use Value: Delivers <±2% current stability across 0–70°C using matched transistors and 22 V reference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A | Same 22 V nominal, ±5% tolerance, but rated 1 W in DO-41 package; higher ZZ (60 Ω) | Higher power handling suits larger transient clamps; DO-41 footprint incompatible with DO-35 layouts | Select when >500 mW surge energy must be absorbed without layout change to PCB |
| MMSZ4696 | 22 V SOD-123 surface-mount package; same 500 mW rating but lower ZZ (45 Ω); tighter 2% tolerance option available | Requires rework for automated assembly; better high-frequency performance due to lower CJ (34 pF) | Select for space-constrained designs where reflow compatibility and reduced parasitic capacitance are critical |
Compared with BZX79C22_T50R, 1N4748A offers higher power but requires board redesign, while MMSZ4696 enables miniaturization and improved AC response at the cost of through-hole assembly compatibility.
Availability
BZX79C22_T50R is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and medical device power supervision requiring stable component supply and long-lifecycle support.
Supply support for BZX79C22_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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient electronics for automotive, industrial, cloud power, and sensing applications.
The BZX79C series was designed for general-purpose voltage regulation and transient suppression in cost-sensitive, high-reliability discrete circuits - emphasizing manufacturability, thermal stability, and legacy footprint compatibility.
FAQ
What is the exact zener voltage range for BZX79C22_T50R at 5 mA test current?
The BZX79C22_T50R has a guaranteed zener voltage range of 20.8 V to 23.3 V when measured at IZ = 5 mA and TL = 30°C ± 1°C with 3/8″ lead length. This 5% tolerance window is defined per ON Semiconductor's BZX79C2V4–BZX79C56 datasheet Rev. 3, and applies directly to the BZX79C22_T50R variant.
Does BZX79C22_T50R have a cathode marking, and how is it identified?
Yes, BZX79C22_T50R uses a single black band on the DO-35 glass body to denote the cathode terminal. This marking follows JEDEC standard polarity identification and is visible on the physical device - the unmarked lead is the anode. The band position is consistent across all BZX79C-series diodes.
What is the maximum allowable junction temperature for BZX79C22_T50R?
The BZX79C22_T50R has a specified junction and storage temperature range of –65°C to +200°C. This rating is absolute - operation beyond +200°C risks permanent degradation. Derating begins at 75°C lead temperature, with power reduced by 4.0 mW per °C above that point.
Can BZX79C22_T50R be used in surface-mount designs?
No, BZX79C22_T50R is exclusively a through-hole DO-35 axial-leaded device and is not suitable for surface-mount assembly. For SMT equivalents, consider MMSZ4696 (SOD-123) or MM3Z22V (SOD-323), which share the same 22 V rating but differ in package, ZZ, and thermal characteristics.
What is the typical junction capacitance of BZX79C22_T50R at zero bias?
The BZX79C22_T50R exhibits a typical junction capacitance of 34 pF when measured at VR = 0 V and f = 1 MHz. This value is confirmed in the "Electrical Characteristics" table of the official ON Semiconductor datasheet and impacts high-frequency noise filtering and transient response in clamp applications.
BZX79C22_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 15.4 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX79C22_T50R FAQ
1.How can I place an order for BZX79C22_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C22_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 BZX79C22_T50R reliable?
The price and inventory of BZX79C22_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C22_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C22_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C22_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C22_T50R?
BZX79C22_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C22_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 BZX79C22_T50R?
For technical support, including BZX79C22_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C22_T50R requirements.
6.How does Aetrix verify that BZX79C22_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C22_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 BZX79C22_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C22_T50R?
All BZX79C22_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C22_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 BZX79C22_T50R part is unused and in its original packaging.
Return procedure for BZX79C22_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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