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Nexperia USA Inc. BZX84-C18,235
- Part No.:
- BZX84-C18,235
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C18,235.pdf
- Description:
- DIODE ZENER 18V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:300,488
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Product details
Overview
BZX84-C18,235 from Nexperia is a silicon planar Zener diode in SOT23 package, designed for low-power voltage regulation and reference applications with nominal 18 V breakdown voltage (±5 % tolerance), 250 mW total power dissipation, and 225 Ω maximum differential resistance at IZ = 5 mA. It operates in general-purpose analog circuits requiring stable DC biasing or overvoltage clamping.
For engineers reviewing the BZX84-C18,235 datasheet, BZX84-C18,235 pinout, BZX84-C18,235 application, or BZX84-C18,235 equivalent, key selection criteria include Zener voltage tolerance (±5 %), thermal resistance (330 K/W junction-to-solder point), non-repetitive peak reverse power (40 W), and SOT23 footprint compatibility with high-density PCB layouts.
Technical Context
This Zener diode employs a planar passivated junction structure optimized for stable reverse-bias operation at 18 V nominal Zener voltage with temperature coefficient of +12.6 mV/K at IZ = 5 mA. Its low 225 Ω dynamic impedance ensures minimal voltage variation under load current changes up to 200 mA forward current rating.
The device is characterized at Tj = 25 °C with reverse current <1 μA at VR = 14.4 V and capacitance of 70 pF at 1 MHz and 0 V bias. Thermal design relies on FR4 PCB mounting with single-sided 70 µm copper, achieving Rth(j-a) = 500 K/W in free air.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 16.8 V to 19.1 V at IZ = 5 mA - defines regulated output range under standard test conditions |
| Differential Resistance rdif | 225 Ω max at IZ = 5 mA - determines voltage stability against load current variation |
| Total Power Dissipation Ptot | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Non-repetitive Peak Reverse Power | 40 W for tp = 100 μs - enables transient overvoltage suppression without failure |
| Junction Temperature Tj | −55 °C to +150 °C - specifies operational and storage thermal limits for reliability |
| Forward Voltage VF | ≤0.9 V at IF = 10 mA - defines conduction loss when used in forward-biased protection paths |
| Reverse Current IR | ≤0.5 μA at VR = 14.4 V - ensures low leakage in high-impedance reference nodes |
Pinout & Package
Package: SOT23 (TO-236AB), surface-mount plastic package with 3 leads, 1.9 mm × 1.1 mm body size, 0.45 mm lead pitch, and standard reflow footprint per Figure 12.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-bias terminal; connects to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating or grounded per layout best practice to avoid parasitic coupling |
| 3 | Cathode (K) | Reverse-bias terminal; connects to higher-potential node and serves as regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective voltage referencing where tight regulation is not critical, e.g., power supply feedback dividers |
| 250 mW power rating | Supports continuous regulation in low-current analog subsystems (<20 mA typical) without heatsinking |
| SOT23 package | Allows automated placement and reflow soldering in space-constrained consumer and industrial PCBs |
| 150 °C maximum junction temperature | Permits reliable operation in ambient temperatures up to +125 °C with appropriate derating |
| 40 W non-repetitive surge capability | Provides robustness against ESD and line transients in unprotected input stages |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in linear regulators or switching converter feedback loops. IC Role / Device Role / Timing Role: Zener reference element setting precise voltage threshold for error amplifier comparison. Use Value: 18 V nominal breakdown provides stable reference for 15–20 V rail monitoring with ±5 % tolerance acceptable for non-critical supplies. |
Use Scenario: Protecting downstream IC inputs from transient overvoltage events. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess energy to ground during voltage spikes. Use Value: 40 W peak power handling absorbs 100 μs surges without degradation, preserving signal integrity in sensor interfaces. |
| DC Bias Generator | Reference Voltage Source |
Use Scenario: Establishing fixed bias points for op-amp input stages or transistor amplifiers. IC Role / Device Role / Timing Role: Passive voltage source providing stable DC offset independent of supply ripple. Use Value: Low 225 Ω dynamic impedance minimizes bias shift under varying load currents, improving amplifier stability. |
Use Scenario: Generating precision reference voltages for ADC/DAC circuits or comparator thresholds. IC Role / Device Role / Timing Role: Primary voltage reference with defined temperature coefficient (+12.6 mV/K). Use Value: Predictable positive TC allows compensation in temperature-sensitive measurement systems using matched components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5245B | 18 V nominal, ±5 %, 350 mW Ptot, 200 Ω rdif, SOT23 package | Higher power rating supports higher continuous current but requires thermal verification on same PCB | Select when >200 mW steady-state dissipation is needed; verify layout thermal performance |
| Vishay BZX84-C18-TP | 18 V nominal, ±5 %, 250 mW Ptot, 225 Ω rdif, identical SOT23 mechanical outline | No functional difference; qualified to AEC-Q200 Grade 3 for extended temperature operation | Choose for automotive-adjacent industrial designs requiring enhanced reliability validation |
Compared with BZX84-C18,235, MMBZ5245B offers higher power headroom at the cost of tighter thermal management, while BZX84-C18-TP delivers identical electrical behavior with added automotive-grade qualification-making it suitable for harsh-environment deployments without circuit redesign.
Availability
BZX84-C18,235 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage clamp, and DC bias generator applications requiring stable component supply, consistent parametric performance, and SOT23 footprint compatibility.
Supply support for BZX84-C18,235 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 focused on high-volume, high-reliability discrete and logic devices, headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.
The BZX84 series belongs to Nexperia's voltage regulator diode product line, engineered for cost-sensitive, space-constrained applications demanding predictable Zener behavior across industrial temperature ranges.
FAQ
What is the maximum continuous reverse current this diode can handle?
The BZX84-C18,235 is rated for a maximum continuous forward current of 200 mA, but its Zener operation is specified at test current IZ = 5 mA. Sustained reverse current above 5 mA must be thermally managed to stay within the 250 mW power limit; exceeding this causes junction temperature rise beyond 150 °C and permanent degradation.
Can this Zener diode be used in series or parallel configurations?
Series connection is viable for higher reference voltages, but mismatched temperature coefficients cause drift; parallel use is strongly discouraged due to current hogging from parameter spread-even within ±5 % tolerance, minor VZ differences cause uneven current sharing and thermal runaway.
How does the 2nd pin (n.c.) affect PCB layout?
Pin 2 is internally unconnected and must remain electrically isolated-no trace should connect to it. Routing near this pin is permitted, but grounding or routing signal traces directly beneath it may introduce parasitic capacitance affecting high-frequency noise immunity in sensitive analog nodes.
Is this part suitable for automotive applications?
No-BZX84-C18,235 is not automotive-qualified. Per Nexperia's revision history (Rev. 7), the BZX84_SER series was explicitly changed to non-automotive qualification in 2023. For automotive use, select Nexperia's -Q qualified variants (e.g., BZX84-C18,215) or Vishay's AEC-Q200-certified equivalents.
BZX84-C18,235 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 250 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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-C18,235 FAQ
1.How can I place an order for BZX84-C18,235 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C18,235 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 BZX84-C18,235 reliable?
The price and inventory of BZX84-C18,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C18,235 is usually 5 days.
3.What payment methods are accepted for BZX84-C18,235?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C18,235 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C18,235?
BZX84-C18,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C18,235 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 BZX84-C18,235?
For technical support, including BZX84-C18,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C18,235 requirements.
6.How does Aetrix verify that BZX84-C18,235 is sourced from the original manufacturer or authorized distributors?
All BZX84-C18,235 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 BZX84-C18,235 meets industry standards.
7.What is the process for return or replacement of BZX84-C18,235?
All BZX84-C18,235 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C18,235, 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 BZX84-C18,235 part is unused and in its original packaging.
Return procedure for BZX84-C18,235:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C18,235 Tags
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MMBZ5240B-7-F
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