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Nexperia USA Inc. BZX79-C22,143
- Part No.:
- BZX79-C22,143
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-C22,143.pdf
- Description:
- DIODE ZENER 22V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:4,976
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Product details
Overview
BZX79-C22,143 from Nexperia is a ±5% tolerance Zener voltage regulator diode in DO-35 (SOD27) glass package, rated for 22 V nominal Zener voltage at 5 mA test current, 500 mW total power dissipation at Tamb = 50 °C, and 60 Ω typical differential resistance. It serves as a low-power voltage reference or stabilization element in linear power supply feedback paths, sensor bias networks, and overvoltage clamp circuits.
For engineers reviewing the BZX79-C22,143 datasheet, BZX79-C22,143 pinout, BZX79-C22,143 application, or BZX79-C22,143 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (380 K/W), non-repetitive peak reverse power (40 W), and cathode-marked axial lead configuration - all critical for precision biasing and transient suppression in space-constrained analog designs.
Technical Context
This discrete Zener diode operates in reverse breakdown mode with a specified Zener voltage of 21.6–22.4 V at IZ = 5 mA, exhibiting a temperature coefficient of +14.1 to +20.0 mV/K and typical differential resistance of 60 Ω. Its junction-to-ambient thermal resistance is 380 K/W under standard PCB mounting conditions (lead length ≤ 8 mm, no metallization pad).
The device delivers stable regulation across −65 °C to +200 °C storage and operating junction temperatures, with reverse leakage limited to ≤100 nA at VR = 0.7 × VZnom and forward voltage ≤0.9 V at IF = 10 mA. Its hermetically sealed glass SOD27 package ensures long-term parameter stability in humid or thermally cycling environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 21.6–22.4 V at IZ = 5 mA - defines precise clamping threshold for voltage reference circuits |
| Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C - sets maximum continuous DC power handling on standard PCB |
| Differential Resistance (rdif) | 60 Ω typical at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Temperature Coefficient (SZ) | +14.1 to +20.0 mV/K - quantifies VZ drift per degree Celsius, critical for temperature-stable references |
| Reverse Leakage (IR) | ≤100 nA at VR = 15.4 V - ensures minimal quiescent current in high-impedance bias networks |
| Package | SOD27 (DO-35) - axial-leaded hermetic glass package with cathode band marking, 4.25 mm body length |
| Non-repetitive Peak Power (PZSM) | 40 W at tp = 100 μs - supports transient overvoltage clamping without failure |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a colored band. Leads are tinned copper-clad steel; body diameter 1.85 mm, overall length 25.4 mm, lead spacing unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in Zener clamp | Connected to lower potential node; carries forward current up to 250 mA or reverse leakage current |
| Cathode | Zener breakdown terminal / regulated output node | Marked with band; referenced to system ground or feedback point; holds stable voltage under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables cost-effective voltage referencing where tight regulation is not required, e.g., power supply feedback dividers |
| 500 mW power rating at 50 °C ambient | Supports continuous operation in compact enclosures without forced cooling or heatsinking |
| Hermetic glass SOD27 package | Provides moisture resistance and long-term parametric stability in industrial and automotive under-hood environments |
| Low 100 nA max reverse leakage at 70% VZ | Minimizes error in high-impedance voltage divider networks used in precision analog sensing |
| 40 W non-repetitive peak power capability | Allows robust transient suppression against ESD or inductive kickback without derating or external protection |
Applications
| Power Supply Feedback Reference | Sensor Bias Voltage Generator |
|---|---|
Use Scenario: Stabilizing output voltage in linear regulators via TL431-like shunt feedback loop. IC Role / Device Role / Timing Role: Zener diode provides fixed reference voltage to comparator input, enabling closed-loop regulation. Use Value: 22 V Zener voltage sets precise output level; ±5% tolerance accommodates cost-sensitive consumer power adapters. |
Use Scenario: Generating stable bias for analog pressure or temperature sensors in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Acts as passive voltage reference for sensor excitation, replacing higher-cost IC references. Use Value: 100 nA reverse leakage preserves battery life; hermetic package ensures reliability over 10-year field deployment. |
| Overvoltage Clamp Circuit | Microcontroller I/O Protection |
Use Scenario: Protecting downstream analog inputs from 24 V rail transients in industrial PLC modules. IC Role / Device Role / Timing Role: Clamps surge energy by entering reverse breakdown before connected circuitry exceeds absolute maximum ratings. Use Value: 40 W peak power rating absorbs 100 μs surges without degradation; DO-35 footprint fits dense PCB layouts. |
Use Scenario: Safeguarding 3.3 V GPIO pins against accidental 5 V or 12 V misconnection in development boards. IC Role / Device Role / Timing Role: Low-capacitance (≈20 pF) Zener shunts excess voltage to ground while minimizing signal distortion. Use Value: 60 Ω dynamic impedance ensures fast response to overvoltage events; axial leads simplify hand-soldering rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 22 V ±5%, 1 W power rating, DO-41 package (5.2 mm body) | Higher power handling but larger footprint; less suitable for ultra-dense layouts | Select when >500 mW continuous dissipation is required and board space permits larger package |
| BZX55C22 | 22 V ±5%, 500 mW, DO-35 package, but higher typical rdif (100 Ω) and wider VZ spread (20.9–23.1 V) | Reduced regulation accuracy and stability under varying load currents | Acceptable only for non-critical biasing where cost is primary constraint and tighter VZ control is unnecessary |
Compared with 1N4744A and BZX55C22, BZX79-C22,143 offers optimal balance of DO-35 footprint compatibility, 60 Ω low dynamic impedance, and tight 21.6–22.4 V VZ range - making it preferred for space-constrained analog references requiring predictable regulation behavior.
Availability
BZX79-C22,143 is available at Aetrix Electronics and suitable for industrial power supply feedback, sensor biasing, overvoltage clamping, and microcontroller I/O protection requiring stable component supply and long-lifecycle support.
Supply support for BZX79-C22,143 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
Nexperia is a global leader in discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products business, with focus on automotive, industrial, computing, and consumer markets.
BZX79 series belongs to Nexperia's legacy Zener diode portfolio designed specifically for low-power voltage regulation and reference applications where reliability, hermetic sealing, and standardized E24 voltage values are essential.
FAQ
What is the maximum continuous reverse current this diode can handle at 22 V?
The BZX79-C22,143 is not rated for continuous reverse current at full Zener voltage. Its continuous power limit is 500 mW at 50 °C ambient, implying a maximum steady-state reverse current of approximately 22.7 mA (500 mW ÷ 22 V). Exceeding this risks thermal runaway due to its 380 K/W junction-to-ambient thermal resistance.
Does this Zener diode have a specified capacitance value?
Yes - the BZX79-C22,143 has a typical diode capacitance of 20 pF measured at f = 1 MHz and VR = 0 V. This low capacitance makes it suitable for high-frequency clamp applications and minimizes loading effects in high-impedance reference networks.
Can this part replace a BZX79-B22 in a precision reference circuit?
No - the BZX79-B22 offers ±2% tolerance (21.6–22.4 V same as C22, but tighter distribution), lower typical differential resistance (40 Ω vs. 60 Ω), and superior temperature coefficient stability. Using BZX79-C22,143 in place of BZX79-B22 degrades reference accuracy and load regulation performance.
Is the cathode lead identified by a marking band on the glass body?
Yes - per Nexperia's SOD27 package specification, a distinct color band (typically black or dark gray) marks the cathode end of the BZX79-C22,143. This band aligns with industry-standard DO-35 polarity identification and must be oriented toward the higher-potential node in Zener regulator configurations.
BZX79-C22,143 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 700 mV
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ALF2
BZX79-C22,143 FAQ
1.How can I place an order for BZX79-C22,143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-C22,143 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 BZX79-C22,143 reliable?
The price and inventory of BZX79-C22,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C22,143 is usually 5 days.
3.What payment methods are accepted for BZX79-C22,143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C22,143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-C22,143?
BZX79-C22,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-C22,143 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 BZX79-C22,143?
For technical support, including BZX79-C22,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C22,143 requirements.
6.How does Aetrix verify that BZX79-C22,143 is sourced from the original manufacturer or authorized distributors?
All BZX79-C22,143 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 BZX79-C22,143 meets industry standards.
7.What is the process for return or replacement of BZX79-C22,143?
All BZX79-C22,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C22,143, 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 BZX79-C22,143 part is unused and in its original packaging.
Return procedure for BZX79-C22,143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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