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Nexperia USA Inc. BZX79-C18,113
- Part No.:
- BZX79-C18,113
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-C18,113.pdf
- Description:
- DIODE ZENER 18V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:7,843
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Product details
Overview
BZX79-C18,113 from Nexperia is a ±5% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 18 V nominal working voltage at 5 mA test current, 500 mW total power dissipation at 50 °C ambient, and 70 Ω typical differential resistance. It serves as a low-power voltage reference in linear power supplies and signal conditioning circuits.
For engineers reviewing the BZX79-C18,113 datasheet, BZX79-C18,113 pinout, BZX79-C18,113 application, or BZX79-C18,113 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 for PCB-level voltage stabilization.
Technical Context
This device operates as a two-terminal silicon Zener diode with controlled reverse breakdown behavior. Its voltage regulation relies on avalanche and Zener mechanisms depending on nominal voltage - for 18 V, avalanche dominates, yielding a positive temperature coefficient of +12.4 to +16.0 mV/K at IZ = 5 mA.
The SOD27 package provides hermetic glass sealing and axial leads with cathode band marking. Thermal performance is defined under standardized mounting conditions: 380 K/W junction-to-ambient resistance with max. 8 mm lead length and no PCB metallization pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 18 V at IZ = 5 mA - defines stable reference point for biasing or clamping circuits |
| Voltage Tolerance | ±5% (C-series) - allows 17.1–19.1 V range at 25 °C, suitable for non-critical references |
| Total Power Dissipation | 500 mW at Tamb = 50 °C - sets maximum continuous DC power handling on standard PCB |
| Differential Resistance | 50–225 Ω (typ. 70 Ω at 5 mA) - determines output impedance and load regulation sensitivity |
| Reverse Leakage Current | 50 nA max. at VR = 12.6 V - ensures minimal quiescent current in high-impedance reference nodes |
| Non-repetitive Peak Power | 40 W for 100 μs pulse - supports transient overvoltage suppression in low-energy surge events |
| Thermal Resistance | 380 K/W junction-to-ambient - defines temperature rise per watt under standard mounting |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode identified by a dark band on the body. Leads are tinned copper-clad steel, compatible with wave and reflow soldering per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side in reverse-biased operation | Connected to lower potential node when used as shunt regulator; carries forward current up to 250 mA |
| Cathode | Zener breakdown terminal / high-voltage side in reverse-biased operation | Marked with band; connected to higher potential node; sustains regulated reverse voltage up to 18 V |
Key Features
| Feature | Design Value |
|---|---|
| Stable ±5% voltage tolerance | Enables cost-effective voltage referencing where tight regulation is not required |
| Hermetic glass SOD27 package | Ensures long-term parameter stability and moisture resistance in industrial environments |
| Low leakage current (≤50 nA) | Minimizes error in high-impedance reference dividers and battery-powered circuits |
| 40 W non-repetitive surge capability | Provides transient overvoltage protection without external TVS in low-energy applications |
Applications
| Power Supply Reference | Signal Level Shifting |
|---|---|
Use Scenario: Providing stable 18 V reference for op-amp biasing or feedback networks in linear AC/DC adapters. IC Role / Device Role / Timing Role: Shunt voltage reference regulating output node against line/load variation. Use Value: Maintains ±5% reference accuracy across temperature and aging, reducing need for trimming components. | Use Scenario: Translating logic-level signals between 3.3 V and 18 V domains in industrial sensor interfaces. IC Role / Device Role / Timing Role: Clamping diode establishing upper rail for level-shifter transistor base drive. Use Value: Limits voltage excursion to 18 V with <50 nA leakage, preserving signal integrity in high-Z input stages. |
| Overvoltage Protection | Current Source Biasing |
Use Scenario: Protecting microcontroller I/O pins from accidental 24 V miswiring in factory automation panels. IC Role / Device Role / Timing Role: Passive crowbar element absorbing short-duration overvoltage transients. Use Value: Withstands 40 W surges for 100 μs without degradation, eliminating need for larger TVS devices. | Use Scenario: Setting precise bias current for LED drivers or analog front-end amplifiers. IC Role / Device Role / Timing Role: Stable voltage source defining emitter/base voltage drop in constant-current transistor configurations. Use Value: 70 Ω dynamic resistance ensures <1% current variation over 1–10 mA load changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4746A | Same 18 V nominal, but ±5% tolerance and DO-41 package (larger, higher thermal mass) | Higher Ptot (1 W) and Rth j-a (125 K/W); suited for higher-power dissipation | Select when board space permits larger package and >500 mW continuous power is needed |
| BZX84-C18 | SMD SOT-23 package, same ±5% tolerance, 300 mW Ptot, 150 Ω rdif | No axial leads; requires surface-mount assembly; lower surge rating (25 W) | Select for automated PCB assembly where through-hole mounting is unavailable |
Compared with 1N4746A and BZX84-C18, BZX79-C18,113 offers the lowest profile axial-leaded solution with balanced surge capability and thermal performance for legacy through-hole designs requiring 18 V reference stability.
Availability
BZX79-C18,113 is available at Aetrix Electronics and suitable for linear power supplies, industrial sensor interfaces, overvoltage protection circuits, and analog bias networks requiring stable component supply and long-lifecycle support.
Supply support for BZX79-C18,113 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 division, serving automotive, industrial, computing, and consumer markets.
The BZX79 series belongs to Nexperia's voltage regulator diode product line, designed specifically for cost-sensitive, low-power voltage reference and stabilization in through-hole mounted equipment.
FAQ
What is the maximum continuous Zener current for BZX79-C18,113 at 25 °C ambient?
At 25 °C ambient, the maximum continuous Zener current is limited by power dissipation: IZmax = Ptot/VZ ≈ 500 mW / 18 V = 27.8 mA. However, derating applies above 50 °C ambient, and the device is typically operated at 5 mA for optimal stability and low temperature coefficient.
Does BZX79-C18,113 have a specified Zener impedance curve?
Yes - differential resistance (rdif) is specified as 50–225 Ω, with typical 70 Ω at IZ = 5 mA. The datasheet provides rdif values across test currents (1 mA, 5 mA) and shows variation with current in Fig.5 and Fig.6, confirming its use-dependent dynamic impedance behavior.
Can BZX79-C18,113 be used in place of a BZX79-B18 for tighter voltage tolerance?
No - BZX79-C18,113 has ±5% tolerance (17.1–19.1 V), while BZX79-B18 has ±2% (17.6–18.4 V). Substituting introduces up to ±3% additional voltage uncertainty and may degrade precision in feedback loops or reference circuits requiring tighter regulation.
Is the cathode marking consistent across all BZX79-Cxxx variants?
Yes - all BZX79-Cxxx devices use the same SOD27 package with a single dark band indicating the cathode terminal. This marking is laser-etched or ink-printed on the glass body and is identical across the full E24 voltage range from 2.4 V to 75 V.
BZX79-C18,113 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.6 V
- 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-C18,113 FAQ
1.How can I place an order for BZX79-C18,113 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-C18,113 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-C18,113 reliable?
The price and inventory of BZX79-C18,113 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C18,113 is usually 5 days.
3.What payment methods are accepted for BZX79-C18,113?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C18,113 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-C18,113?
BZX79-C18,113 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-C18,113 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-C18,113?
For technical support, including BZX79-C18,113 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C18,113 requirements.
6.How does Aetrix verify that BZX79-C18,113 is sourced from the original manufacturer or authorized distributors?
All BZX79-C18,113 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-C18,113 meets industry standards.
7.What is the process for return or replacement of BZX79-C18,113?
All BZX79-C18,113 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C18,113, 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-C18,113 part is unused and in its original packaging.
Return procedure for BZX79-C18,113:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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