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Nexperia USA Inc. NZX18A,133
- Part No.:
- NZX18A,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
NZX18A,133.pdf
- Description:
- DIODE ZENER 17.3V 500MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:9,926
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Product details
Overview
NZX18A,133 from Nexperia is a single Zener diode in a hermetically sealed SOD27 (SC-40) glass package, designed for precision voltage regulation and reference functions at 18 V nominal Zener voltage with ±5% tolerance. It delivers 55 Ω differential resistance at 5 mA test current, supports up to 500 mW total power dissipation, and exhibits low leakage current (<0.05 µA at VR = 12.6 V), making it suitable for stable biasing and overvoltage protection in low-power analog circuits.
For engineers reviewing the NZX18A,133 datasheet, NZX18A,133 pinout, NZX18A,133 application, or NZX18A,133 equivalent, this device is selected for its tight voltage tolerance, low thermal drift, axial-leaded through-hole compatibility, and proven reliability in industrial power supply feedback loops and sensor reference networks.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal working voltage of 17.5 V to 18.3 V at IZ = 5 mA, exhibiting a temperature coefficient near zero crossing in the 15–20 V range-critical for stable reference performance across temperature. Its low differential resistance (55 Ω max) ensures minimal output impedance under varying load conditions.
The device uses a glass-encapsulated axial lead structure with cathode marked by a band, enabling straightforward polarity identification on PCBs. Thermal resistance from junction to ambient is 380 K/W in free air, limiting continuous power handling without heatsinking but supporting pulsed operation per IEC 60134 absolute maximum ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.5 V min / 18.3 V max at IZ = 5 mA - defines precise regulation threshold for feedback or clamping |
| Differential Resistance (rdif) | 55 Ω max at IZ = 5 mA - ensures low output impedance and minimal voltage shift under load variation |
| Reverse Current (IR) | <0.05 µA at VR = 12.6 V - guarantees negligible leakage in high-impedance reference paths |
| Total Power Dissipation (Ptot) | 500 mW max at Ttp ≤ 25 °C - sets safe DC operating limit without forced cooling |
| Junction Temperature (Tj) | −65 °C to +175 °C - enables deployment in extended-temperature industrial environments |
| Forward Voltage (VF) | 1.5 V max at IF = 200 mA - supports use as forward-biased clamp or indicator in dual-role designs |
Pinout & Package
Package: SOD27 (SC-40), hermetically sealed axial-leaded glass package with 2 mm diameter body and 25.4 mm minimum lead length; cathode identified by a colored band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 | Anode | Connected to ground or lower-potential rail; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Prevents moisture ingress and long-term parameter drift in humid or harsh environments |
| Low differential resistance | 55 Ω max improves regulation accuracy under dynamic load changes in feedback networks |
| Tight voltage tolerance | ±5% (17.5–18.3 V) enables predictable clamping without post-production trimming |
| Low leakage current | <0.05 µA at 12.6 V minimizes error in high-impedance voltage references and sensor interfaces |
Applications
| Power Supply Feedback Loop | Sensor Reference Voltage |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated AC/DC adapters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference element setting precise feedback threshold for TL431 or similar shunt regulators. Use Value: Stable 18 V reference ensures ±1% output regulation across line/load/temperature variations. |
Use Scenario: Provides bias voltage for analog front-end amplifiers in industrial pressure transducers. IC Role / Device Role / Timing Role: Low-drift voltage reference source for ADC input scaling and offset calibration. Use Value: Sub-µA leakage and low rdif prevent loading errors and maintain 16-bit measurement integrity. |
| Overvoltage Clamp | Microcontroller I/O Protection |
Use Scenario: Placed across relay coil terminals to suppress inductive kickback spikes. IC Role / Device Role / Timing Role: Transient voltage suppression device clamping energy above 18 V during switch-off. Use Value: Fast response and 500 mW rating absorb repetitive 100 ms pulses without degradation. |
Use Scenario: Connected between microcontroller GPIO and external signal lines in factory automation modules. IC Role / Device Role / Timing Role: Input protection diode limiting voltage excursions to safe levels during ESD events. Use Value: Glass-sealed construction withstands repeated 8 kV HBM ESD strikes while maintaining Zener stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55-C18 | Same 18 V nominal, but ±10% tolerance (16.2–19.8 V); higher rdif (100 Ω max) | Acceptable where tighter regulation not required; lower cost in high-volume consumer designs | Select when budget constraints outweigh precision needs and thermal stability is secondary |
| 1N4746A | 18 V nominal, ±5% tolerance, but 1 W power rating and DO-41 package; rdif = 20 Ω | Requires larger PCB footprint; suited for higher-power linear regulator applications | Choose when >500 mW dissipation or lower impedance is mandatory, and axial space allows DO-41 |
Compared with BZX55-C18 and 1N4746A, NZX18A,133 offers superior voltage precision and hermetic reliability in compact SOD27 form-ideal for space-constrained industrial references where long-term drift must be minimized.
Availability
NZX18A,133 is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and embedded protection circuits requiring stable component supply and consistent Zener voltage performance across production batches.
Supply support for NZX18A,133 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 semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET solutions with focus on efficiency, miniaturization, and robustness for industrial and automotive markets.
The NZX series targets general-purpose Zener regulation with emphasis on hermetic reliability, tight tolerances, and thermal stability in through-hole applications-designed specifically for analog reference and protection roles in mission-critical equipment.
FAQ
What is the maximum continuous reverse current the NZX18A,133 can sustain without degradation?
The NZX18A,133 is rated for a maximum total power dissipation of 500 mW at Ttp ≤ 25 °C. At its nominal 18 V Zener voltage, this corresponds to a continuous reverse current of approximately 27.8 mA (500 mW ÷ 18 V). Exceeding this value risks thermal runaway unless board-level heatsinking or derating per Rth(j-a) = 380 K/W is applied.
How does the cathode marking appear on the NZX18A,133 package?
The cathode is indicated by a single colored band (typically black or dark gray) located near one end of the cylindrical glass body. Pin 1 (cathode) is the lead adjacent to this band; Pin 2 (anode) is the opposite lead. This marking conforms to JEDEC SC-40 standard and is visible before and after PCB insertion.
Can NZX18A,133 be used in surface-mount designs?
No-NZX18A,133 is exclusively packaged in the axial-leaded SOD27 (SC-40) through-hole format and lacks surface-mount terminations. It requires hole mounting and wave or selective soldering. For SMT equivalents, consider Nexperia's BZX384-B18 (SOD-323) or PZM18A (SOT-23), which differ in package, thermal behavior, and test conditions.
What is the temperature coefficient behavior of NZX18A,133 near its operating point?
Per Nexperia's Fig 4, the NZX18A,133 (within the NZX16–NZX18 range) exhibits a near-zero temperature coefficient (~0 mV/K) at IZ ≈ 5 mA, with typical values ranging from −1.5 to +1.5 mV/K across −55 °C to +150 °C. This minimizes voltage drift in precision reference applications without active compensation.
NZX18A,133 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- NZX
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 17.3 V
- Tolerance:
- ±2%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -55°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ALF2
NZX18A,133 FAQ
1.How can I place an order for NZX18A,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for NZX18A,133 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 NZX18A,133 reliable?
The price and inventory of NZX18A,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NZX18A,133 is usually 5 days.
3.What payment methods are accepted for NZX18A,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NZX18A,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NZX18A,133?
NZX18A,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NZX18A,133 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 NZX18A,133?
For technical support, including NZX18A,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NZX18A,133 requirements.
6.How does Aetrix verify that NZX18A,133 is sourced from the original manufacturer or authorized distributors?
All NZX18A,133 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 NZX18A,133 meets industry standards.
7.What is the process for return or replacement of NZX18A,133?
All NZX18A,133 units undergo pre-shipment inspection (PSI). If there is an issue with NZX18A,133, 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 NZX18A,133 part is unused and in its original packaging.
Return procedure for NZX18A,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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