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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. BZX84-C18/DG/B3,23

Name: BZX84-C18/DG/B3,23
Brand: Nexperia USA Inc.
SKU: BZX84-C18/DG/B3,23
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-C18/DG/B3,23

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BZX84-C18/DG/B3,23.pdf

Description:: DIODE ZENER 17.95V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:8,616

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Product details

Overview

BZX84-C18/DG/B3,23 from Nexperia is a 18 V, 250 mW surface-mount Zener diode in SOT-23 package with ±5% tolerance, 50 Ω dynamic impedance, and 100 nA reverse leakage at 12 V, used for voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84-C18/DG/B3,23 datasheet, BZX84-C18/DG/B3,23 pinout, BZX84-C18/DG/B3,23 application, or BZX84-C18/DG/B3,23 equivalent, key selection criteria include Zener voltage accuracy, power dissipation limit, thermal resistance, and SOT-23 footprint compatibility with automated assembly.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. It features a nominal Zener voltage of 18 V at test current of 5 mA, with maximum power dissipation of 250 mW at T_A = 25 °C and derating above 65 °C.

The device exhibits typical dynamic impedance of 50 Ω at I_Z = 5 mA and reverse leakage current ≤100 nA at V_R = 12 V, supporting precision biasing and clamping functions in signal conditioning and power supply feedback paths.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	18 V ±5% at I_Z = 5 mA - defines regulated output voltage with tight tolerance for reference stability
Power Dissipation (P_tot)	250 mW at T_A = 25 °C - limits continuous operating current to avoid thermal runaway in SOT-23
Dynamic Impedance (Z_ZT)	50 Ω max at I_Z = 5 mA - determines voltage regulation sensitivity to load current changes
Reverse Leakage (I_R)	≤100 nA at V_R = 12 V - ensures minimal error current in high-impedance reference nodes
Thermal Resistance (R_thJA)	500 K/W - governs junction temperature rise under ambient conditions without heatsinking

Pinout & Package

Package: SOT-23 (3-pin plastic small outline transistor), standard cathode-anode-anode pin assignment per JEDEC TO-236AB.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Current entry terminal in forward bias	Connected to ground or lower potential node during Zener operation
Pin 2 (Cathode)	Current exit terminal in reverse breakdown	Connected to regulated voltage rail; polarity marking on package body
Pin 3 (Anode)	Redundant anode connection	Internally tied to Pin 1; improves thermal and mechanical robustness

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables accurate voltage referencing without external trimming in space-constrained designs
250 mW power rating	Supports regulation in battery-powered sensors and low-current feedback loops
SOT-23 package	Compatible with standard pick-and-place equipment and reflow soldering profiles
Low 100 nA leakage at 12 V	Maintains high input impedance in op-amp reference inputs and comparator thresholds

Applications

Industrial Sensor Signal Conditioning

USB Port Overvoltage Protection

Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature transmitters.

IC Role / Device Role / Timing Role: Zener diode providing precise 18 V rail for op-amp biasing and ADC reference divider.

Use Value: ±5% V_Z tolerance ensures <0.5 LSB error contribution across operating temperature range.

Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events.

IC Role / Device Role / Timing Role: Reverse-biased Zener limiting voltage excursion to protect downstream USB controller IC.

Use Value: 250 mW rating handles short-duration 10/1000 µs surge pulses without degradation.

Low-Power IoT Node Power Management

Automotive Cabin Control Panel Reference

Use Scenario: Generating stable 18 V bias for RF transceiver LDO enable circuitry.

IC Role / Device Role / Timing Role: Zener regulating enable threshold voltage for ultra-low-quiescent LDO.

Use Value: 100 nA leakage prevents measurable current draw from coin-cell battery during sleep mode.

Use Scenario: Providing calibrated reference for HVAC control panel display backlight dimming.

IC Role / Device Role / Timing Role: Zener establishing fixed voltage point for PWM duty-cycle scaling.

Use Value: 50 Ω dynamic impedance ensures consistent dimming response across 12–16 V vehicle supply variation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C18,215	Same Zener voltage and tolerance, but 370 mW power rating in SOT-23	Higher power handling supports longer surge duration in industrial ESD protection	Select when >250 mW pulse energy must be absorbed without derating
MMSZ5245B-7-F	18 V ±5%, but SOD-123 package and 500 mW rating	Larger footprint and higher thermal mass suit board-level voltage references	Choose for improved thermal stability in high-ambient-temperature environments

Compared with BZX84-C18/DG/B3,23, the BZX84-C18,215 offers higher pulse power margin in identical SOT-23 layout, while MMSZ5245B-7-F trades compactness for superior thermal performance and DC power handling in non-space-constrained designs.

Availability

BZX84-C18/DG/B3,23 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB peripheral protection, and low-power IoT node power management requiring stable component supply and full traceability.

Supply support for BZX84-C18/DG/B3,23 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 series of general-purpose Zener diodes designed for voltage regulation, waveform clipping, and reference generation in cost-sensitive consumer and industrial electronics.

FAQ

What is the maximum reverse test current for BZX84-C18/DG/B3,23?

The device is characterized at I_Z = 5 mA for Zener voltage specification, with absolute maximum DC reverse current limited to 100 mA per Nexperia's datasheet. Continuous operation above 5 mA requires thermal derating based on R_thJA = 500 K/W and ambient temperature.

Does BZX84-C18/DG/B3,23 have AEC-Q200 qualification?

No, BZX84-C18/DG/B3,23 is not AEC-Q200 qualified. It is rated for industrial temperature range (−65 °C to +150 °C) but lacks automotive-specific stress testing and traceability documentation required for automotive ECUs or infotainment systems.

Can this Zener diode replace a 1N4746A in existing designs?

No - the 1N4746A is a 18 V, 1 W through-hole Zener in DO-41 package. While voltage matches, BZX84-C18/DG/B3,23 has only 250 mW rating and SOT-23 footprint, making it unsuitable for same-power applications or direct PCB replacement without layout and thermal redesign.

What is the cathode marking on the SOT-23 package?

The cathode is marked by a band on the package body adjacent to Pin 2. Pin 1 is the leftmost pin when the marking band is oriented at the top-left corner of the SOT-23 outline, per JEDEC standard orientation for TO-236AB devices.

BZX84-C18/DG/B3,23 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:: Obsolete

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/B3,23 FAQ

1.How can I place an order for BZX84-C18/DG/B3,23 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-C18/DG/B3,23 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/B3,23 reliable?

The price and inventory of BZX84-C18/DG/B3,23 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/B3,23 is usually 5 days.

3.What payment methods are accepted for BZX84-C18/DG/B3,23?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C18/DG/B3,23 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-C18/DG/B3,23?

BZX84-C18/DG/B3,23 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-C18/DG/B3,23 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/B3,23?

For technical support, including BZX84-C18/DG/B3,23 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C18/DG/B3,23 requirements.

6.How does Aetrix verify that BZX84-C18/DG/B3,23 is sourced from the original manufacturer or authorized distributors?

All BZX84-C18/DG/B3,23 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/B3,23 meets industry standards.

7.What is the process for return or replacement of BZX84-C18/DG/B3,23?

All BZX84-C18/DG/B3,23 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C18/DG/B3,23, 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/B3,23 part is unused and in its original packaging.

Return procedure for BZX84-C18/DG/B3,23:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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