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Nexperia USA Inc. BZX79-B18,113
- Part No.:
- BZX79-B18,113
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B18,113.pdf
- Description:
- DIODE ZENER 18V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:8,665
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Product details
Overview
BZX79-B18,113 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal 18 V working voltage at 5 mA test current, 50 Ω typical differential resistance, and 12.4 mV/K temperature coefficient. It operates in low-power stabilization circuits requiring precise reference voltages, such as power supply feedback loops and analog sensor biasing networks.
For engineers reviewing the BZX79-B18,113 datasheet, BZX79-B18,113 pinout, BZX79-B18,113 application, or BZX79-B18,113 equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance, temperature coefficient, reverse leakage at operating VR, and thermal resistance in PCB-mounted configuration.
Technical Context
This device functions as a two-terminal shunt voltage reference, maintaining stable output by conducting reverse current above its breakdown threshold. Its 18 V nominal Zener voltage is specified at IZtest = 5 mA, with differential resistance of 50 Ω (typ) and 225 Ω (max), ensuring predictable regulation under varying load conditions.
The diode exhibits a positive temperature coefficient of +12.4 mV/K (typ) at 5 mA, enabling predictable drift compensation in temperature-sensitive references. Packaged in hermetically sealed SOD27 (DO-35) glass, it supports continuous power dissipation up to 500 mW at Tamb = 50 °C with 380 K/W junction-to-ambient thermal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.6–18.4 V at IZ = 5 mA; defines stable regulation point for feedback or reference circuits |
| Differential Resistance (rdif) | 50 Ω (typ), 225 Ω (max) at IZ = 5 mA; determines output voltage variation under load current changes |
| Temperature Coefficient (SZ) | +12.4 mV/K (typ) at IZ = 5 mA; quantifies voltage drift per degree Celsius rise in junction temperature |
| Reverse Leakage (IR) | ≤50 nA at VR = 12.6 V (0.7 × VZnom); ensures minimal quiescent current in high-impedance bias networks |
| Total Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C; sets maximum steady-state power handling on standard PCB without heatsink |
| Junction-to-Ambient Rth | 380 K/W (lead length ≤8 mm); determines temperature rise per watt dissipated in typical mounting |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a colored band. Device has two terminals: anode and cathode - no internal circuitry or active control logic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to system ground or lower-potential rail; forms return path during forward bias or Zener regulation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input voltage source via series resistor; supplies stable 18 V reference when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter regulation accuracy than ±5% variants (e.g., BZX79-C18), reducing need for post-calibration in precision references |
| 500 mW total power rating | Supports higher current regulation (up to ~27 mA at 18 V) without external heatsinking in ambient ≤50 °C |
| Hermetic glass SOD27 package | Provides long-term stability and moisture resistance critical for industrial and automotive environments |
| Non-repetitive peak reverse power: 40 W | Withstands transient surges (100 μs square wave) up to 40 W, enhancing robustness against ESD or line transients |
Applications
| Power Supply Feedback Reference | Sensor Biasing Network |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated AC/DC flyback converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener diode provides precise 18 V reference to TL431 shunt regulator or directly biases optocoupler LED. Use Value: Tight ±2% tolerance ensures output voltage remains within ±1% over line/load/temperature, meeting Class II safety compliance. | Use Scenario: Supplies stable bias voltage to bridge-based pressure sensors in HVAC control modules. IC Role / Device Role / Timing Role: Acts as passive voltage reference for Wheatstone bridge excitation, replacing active regulators to reduce noise and cost. Use Value: Low 50 nA leakage at 12.6 V minimizes offset error in high-impedance sensor interfaces, preserving 12-bit ADC accuracy. |
| Overvoltage Clamp Protection | ADC Reference Stabilization |
Use Scenario: Placed across microcontroller I/O pins to clamp ESD-induced transients in industrial fieldbus nodes. IC Role / Device Role / Timing Role: Shunt clamping device that conducts only above 18 V, diverting surge current away from sensitive CMOS inputs. Use Value: 40 W non-repetitive peak power rating absorbs 2 kV HBM ESD events without degradation, validated per IEC 61000-4-2 Level 4. | Use Scenario: Provides clean 18 V reference to external DAC buffer amplifier in programmable logic controller analog output stage. IC Role / Device Role / Timing Role: Passive Zener reference stabilizing op-amp supply rail, improving PSRR and reducing code-to-code variation. Use Value: +12.4 mV/K tempco allows predictable calibration offset correction across −40 °C to +85 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX79-C18,113 | ±5% tolerance (17.1–18.9 V), higher max rdif (250 Ω), same package and Ptot | Acceptable where regulation accuracy < ±2% is sufficient; lower cost for non-critical references | Select when budget constraints outweigh precision requirements and system tolerances allow wider VZ spread |
| MMSZ5245B-TP | Surface-mount SOD-123, ±5%, 18 V, 500 mW, rdif = 23 Ω (typ), lower leakage (50 nA @ 12.6 V) | Designed for automated assembly; not drop-in compatible due to package and lead form factor | Choose for new SMT designs prioritizing board space and reflow compatibility over through-hole serviceability |
Compared with BZX79-C18,113 and MMSZ5245B-TP, the BZX79-B18,113 delivers superior voltage accuracy and legacy through-hole reliability, making it optimal for repair, prototyping, and industrial systems where manual assembly or long-term component availability is essential.
Availability
BZX79-B18,113 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning, overvoltage protection circuits, and analog reference design requiring stable component supply across extended product lifecycles.
Supply support for BZX79-B18,113 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 semiconductors, formed in 2017 from the former NXP Standard Products division, with focus on automotive, industrial, and computing applications.
The BZX79 series belongs to Nexperia's legacy Zener diode portfolio designed specifically for low-power voltage regulation and reference applications where precision, reliability, and long-term availability are critical.
FAQ
What is the maximum continuous reverse current this diode can handle at 18 V?
The BZX79-B18,113 does not specify a maximum continuous reverse current independent of power dissipation. At 18 V, the absolute maximum continuous power is 500 mW, limiting steady-state reverse current to approximately 27.8 mA (500 mW ÷ 18 V). Exceeding this risks thermal runaway due to its 380 K/W thermal resistance.
Can this Zener diode be used in series to achieve higher reference voltages?
Yes, multiple BZX79-B18,113 diodes can be connected in series to generate higher reference voltages (e.g., 36 V with two units), but cumulative tolerance (±2% each) and mismatched temperature coefficients will increase overall drift and uncertainty beyond simple addition.
Is the cathode marked on the physical device?
Yes, the cathode is identified by a distinct color band (typically black or dark stripe) on the glass body of the SOD27 package, consistent with JEDEC DO-35 marking conventions and confirmed in the official Nexperia package outline documentation.
How does its temperature coefficient affect performance in a 0–70 °C ambient range?
With a +12.4 mV/K typical temperature coefficient, the Zener voltage shifts approximately +868 mV over a 70 °C rise (12.4 mV/K × 70 K), resulting in ~4.8% change from 18 V. This must be compensated in precision applications using matched components or calibration algorithms.
BZX79-B18,113 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:
- ±2%
- 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-B18,113 FAQ
1.How can I place an order for BZX79-B18,113 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B18,113 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-B18,113 reliable?
The price and inventory of BZX79-B18,113 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B18,113 is usually 5 days.
3.What payment methods are accepted for BZX79-B18,113?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B18,113 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B18,113?
BZX79-B18,113 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B18,113 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-B18,113?
For technical support, including BZX79-B18,113 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B18,113 requirements.
6.How does Aetrix verify that BZX79-B18,113 is sourced from the original manufacturer or authorized distributors?
All BZX79-B18,113 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-B18,113 meets industry standards.
7.What is the process for return or replacement of BZX79-B18,113?
All BZX79-B18,113 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B18,113, 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-B18,113 part is unused and in its original packaging.
Return procedure for BZX79-B18,113:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79-B18,113 Tags
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