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Nexperia USA Inc. BZX84-C18/DG/B4R
- Part No.:
- BZX84-C18/DG/B4R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C18/DG/B4R.pdf
- Description:
- DIODE ZENER 17.95V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,319
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Product details
Overview
BZX84-C18/DG/B4R from Nexperia is a surface-mount 18 V Zener diode with 250 mW power dissipation, ±5% tolerance, and 100 nA maximum reverse leakage at 13.7 V. It operates in voltage regulation and overvoltage protection circuits for low-power consumer and industrial electronics.
For engineers reviewing the BZX84-C18/DG/B4R datasheet, BZX84-C18/DG/B4R pinout, BZX84-C18/DG/B4R application, or BZX84-C18/DG/B4R equivalent, key selection criteria include Zener voltage accuracy, thermal stability under 250 mW derating, SOT23 package footprint compatibility, and reverse leakage performance at bias conditions near rated voltage.
Technical Context
This Zener diode is designed for stable voltage reference and clamping functions in DC bias networks and signal-level protection. Its 18 V nominal breakdown voltage is specified at test current of 5 mA, with dynamic impedance of 40 Ω typical at that condition.
The device exhibits a temperature coefficient of +0.075 %/°C, enabling predictable drift behavior across –65 °C to +150 °C operating range. It complies with AEC-Q101 for automotive-grade reliability when used within its absolute maximum ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±5% at IZ = 5 mA - defines precise clamping threshold for protection circuits |
| Power Dissipation (Ptot) | 250 mW at Tamb = 25 °C - limits continuous thermal load in SOT23 footprint |
| Reverse Leakage (IR) | ≤100 nA at VR = 13.7 V - ensures minimal standby current in high-impedance bias networks |
| Zener Impedance (ZZT) | 40 Ω typical at IZ = 5 mA - determines regulation stiffness under varying load current |
| Temperature Coefficient | +0.075 %/°C - enables predictable VZ drift compensation in temperature-sensitive references |
| Operating Temperature | –65 °C to +150 °C - supports deployment in extended-environment industrial and automotive modules |
Pinout & Package
SOT23-3 surface-mount plastic package with standard anode-cathode configuration; cathode marked by band on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current entry terminal during forward conduction | Connected to lower-potential node in Zener bias network |
| Pin 2 (Cathode) | Current exit terminal during reverse breakdown | Connected to regulated or clamped node; marked by band |
| Pin 3 (Anode) | Internal tie to Pin 1 - redundant anode connection | Provides mechanical robustness and thermal path continuity in SOT23 layout |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables tight regulation without external trimming in cost-sensitive power rails |
| AEC-Q101 qualified | Validates suitability for automotive body electronics and infotainment supply monitoring |
| Low 100 nA leakage at 13.7 V | Minimizes error in high-impedance reference dividers and battery-monitoring circuits |
| SOT23 package footprint | Supports automated placement and reflow compatibility with standard 0.95 mm pitch PCB land patterns |
Applications
| USB Port Overvoltage Protection | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamps transient surges on USB VBUS line to prevent damage to downstream ICs. IC Role / Device Role / Timing Role: Zener clamp placed between VBUS and ground, triggered above 18 V. Use Value: Limits peak voltage to 18.9 V (max), protecting 5 V tolerant I/O pins without adding series resistance. | Use Scenario: Generates clean reset signal when main supply drops below brown-out threshold. IC Role / Device Role / Timing Role: Forms precision voltage reference in RC-based reset timing network. Use Value: Provides stable 18 V reference for comparator input, enabling accurate 3.3 V or 5 V supply monitoring. |
| Industrial Sensor Signal Conditioning | LED Driver Current Regulation |
Use Scenario: Stabilizes excitation voltage for bridge-based pressure sensors in 24 V systems. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant 18 V bias across sensor Wheatstone bridge. Use Value: Reduces output drift caused by supply variation, improving measurement repeatability by <0.1% FS. | Use Scenario: Sets reference voltage for adjustable constant-current LED driver IC. IC Role / Device Role / Timing Role: Provides fixed 18 V reference to driver's feedback pin for current-sense resistor scaling. Use Value: Enables accurate current setting across ambient temperatures due to low TC and stable Zener impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18,115 (Nexperia) | Same electrical specs; differs only in packaging tape/reel orientation code | No functional impact; identical board-level performance and solderability | Select when standard reel orientation is required for pick-and-place setup |
| MMSZ5245B-TP (Micro Commercial Components) | 18 V ±5%, 500 mW rating, higher power but same SOT23 footprint | Allows higher surge energy handling; requires thermal derating above 100 °C ambient | Choose for designs needing margin in transient-heavy environments like motor control interfaces |
Compared with BZX84-C18/DG/B4R, the /115 variant offers identical regulation performance with reel logistics differentiation, while MMSZ5245B-TP trades tighter thermal constraints for doubled power headroom-critical when clamping repetitive 100 ns transients in industrial I/O modules.
Availability
BZX84-C18/DG/B4R is available at Aetrix Electronics and suitable for USB protection circuits, microcontroller reset networks, industrial sensor biasing, and LED driver reference design requiring stable component supply and consistent Zener voltage performance.
Supply support for BZX84-C18/DG/B4R 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.
This part belongs to the BZX84-C series of Zener diodes engineered for precision voltage reference and clamping in space-constrained, cost-sensitive applications across consumer, industrial, and automotive markets.
FAQ
What is the maximum reverse voltage before breakdown for BZX84-C18/DG/B4R?
The nominal Zener voltage is 18 V with ±5% tolerance, meaning breakdown occurs between 17.1 V and 18.9 V at test current of 5 mA. The absolute maximum non-breakdown reverse voltage is not defined; operation below 13.7 V ensures ≤100 nA leakage per datasheet limits.
Can BZX84-C18/DG/B4R be used in place of a 15 V Zener diode?
No-it is not a drop-in replacement for 15 V Zeners due to fixed 18 V nominal breakdown. Substituting would raise clamping voltage by 3 V, potentially exceeding safe operating limits of protected circuitry and invalidating design margins.
Is this device suitable for bidirectional ESD protection?
No-BZX84-C18/DG/B4R is a unidirectional Zener diode optimized for DC voltage regulation and clamping. For bidirectional ESD protection, purpose-built TVS diodes such as PESD5V0S1BA must be used instead.
How does temperature affect the Zener voltage in actual operation?
Its temperature coefficient is +0.075 %/°C, so VZ increases by approximately 13.5 mV per °C rise above 25 °C. At 125 °C ambient, VZ shifts +1.35 V from nominal, reaching ~19.35 V under full-rated current.
BZX84-C18/DG/B4R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 17.95 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-C18/DG/B4R FAQ
1.How can I place an order for BZX84-C18/DG/B4R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C18/DG/B4R 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/DG/B4R reliable?
The price and inventory of BZX84-C18/DG/B4R 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/DG/B4R is usually 5 days.
3.What payment methods are accepted for BZX84-C18/DG/B4R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C18/DG/B4R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C18/DG/B4R?
BZX84-C18/DG/B4R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C18/DG/B4R 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/DG/B4R?
For technical support, including BZX84-C18/DG/B4R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C18/DG/B4R requirements.
6.How does Aetrix verify that BZX84-C18/DG/B4R is sourced from the original manufacturer or authorized distributors?
All BZX84-C18/DG/B4R 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/DG/B4R meets industry standards.
7.What is the process for return or replacement of BZX84-C18/DG/B4R?
All BZX84-C18/DG/B4R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C18/DG/B4R, 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/DG/B4R part is unused and in its original packaging.
Return procedure for BZX84-C18/DG/B4R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C18/DG/B4R Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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