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

Nexperia USA Inc. BZX84-C3V9/DG/B3,2

Name: BZX84-C3V9/DG/B3,2
Brand: Nexperia USA Inc.
SKU: BZX84-C3V9/DG/B3,2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-C3V9/DG/B3,2

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-C3V9/DG/B3,2.pdf

Description:: DIODE ZENER 3.9V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:9,225

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Product details

Overview

BZX84-C3V9/DG/B3,2 from Nexperia is a 3.9 V, 250 mW silicon planar Zener diode in SOT23 package, with ±5% tolerance, 90 Ω dynamic impedance at 5 mA, and 100 nA reverse leakage at 1 V, used for voltage regulation and reference in low-power analog circuits.

For engineers reviewing the BZX84-C3V9/DG/B3,2 datasheet, BZX84-C3V9/DG/B3,2 pinout, BZX84-C3V9/DG/B3,2 application, or BZX84-C3V9/DG/B3,2 equivalent, key selection criteria include Zener voltage accuracy, power dissipation limit, dynamic impedance at operating current, temperature coefficient, and SOT23 footprint compatibility in space-constrained PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. It is characterized at test current I_Z = 5 mA and supports continuous DC operation up to 250 mW at T_amb = 25 °C.

The device exhibits a nominal temperature coefficient of +2.5 mV/K near 3.9 V, indicating moderate positive drift with rising junction temperature, and achieves <100 nA reverse leakage at 1 V, confirming low standby current draw in bias networks.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.9 V ±5% at I_Z = 5 mA - defines regulated output level with tight tolerance for precision reference use
Power Dissipation (P_tot)	250 mW at T_amb = 25 °C - sets maximum continuous thermal load in ambient-mounted SOT23 layout
Dynamic Impedance (Z_Z)	90 Ω at I_Z = 5 mA - determines output voltage stability against load current variation
Reverse Leakage (I_R)	100 nA at V_R = 1 V - ensures minimal quiescent current in high-impedance bias chains
Temperature Coefficient	+2.5 mV/K near 3.9 V - quantifies voltage drift per degree Celsius rise in junction temperature
Package	SOT23 - surface-mount 3-pin package enabling automated assembly and compact board placement

Pinout & Package

SOT23 package: plastic surface-mount package with three leads, standardized pin assignment per JEDEC TO-236AB. Cathode marked by band on top surface.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Forward conduction terminal	Connected to lower potential side in Zener regulation configuration
Cathode (Pin 2)	Reverse breakdown terminal	Connected to regulated output node; marked by band on package
NC / Dummy (Pin 3)	No internal connection	Unused lead; electrically isolated, may be left floating or grounded per layout rules

Key Features

Feature	Design Value
Low dynamic impedance	90 Ω enables tighter regulation under load transients in feedback references
Tight voltage tolerance	±5% at 5 mA supports accurate biasing in ADC reference dividers and op-amp setpoints
Low leakage current	100 nA at 1 V minimizes error in high-resistance voltage divider networks
SOT23 footprint	Standardized 3-pin package allows drop-in replacement and compatibility with existing pick-and-place tooling

Applications

Power Supply Reference

Overvoltage Clamp

Use Scenario: Providing stable 3.9 V reference for low-current LDO feedback or microcontroller reset threshold detection.

IC Role / Device Role / Timing Role: Voltage reference element establishing precise trip point in analog monitoring circuitry.

Use Value: ±5% V_Z tolerance and 90 Ω Z_Z ensure repeatable activation voltage across temperature and unit variance.

Use Scenario: Clamping transient spikes on 5 V logic rails to protect downstream CMOS inputs.

IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy when rail exceeds 3.9 V + V_f.

Use Value: 250 mW rating and fast reverse recovery support short-duration surge absorption without thermal runaway.

ADC Input Protection

Current Source Bias

Use Scenario: Limiting input voltage to 3.9 V before an analog-to-digital converter's front-end buffer.

IC Role / Device Role / Timing Role: Input clamp preventing overvoltage damage to sensitive SAR or sigma-delta ADC inputs.

Use Value: 100 nA leakage at 1 V avoids loading high-impedance sensor signal paths prior to clamping.

Use Scenario: Generating stable bias current for LED driver or op-amp offset compensation network.

IC Role / Device Role / Timing Role: Constant-voltage node enabling predictable current through series resistor.

Use Value: +2.5 mV/K tempco allows predictable current drift in temperature-critical analog blocks.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5226BS-7-F	3.9 V ±5%, 225 mW, Z_Z = 90 Ω at 20 mA, SOT23	Higher test current shifts regulation point; slightly lower power rating	Prefer where higher test current improves stability in current-source configurations
BZX384-C3V9	3.9 V ±5%, 300 mW, Z_Z = 90 Ω at 5 mA, SOD323	Larger SOD323 package; 50 mW higher power rating	Choose when additional thermal margin or legacy SOD323 layout reuse is required

Compared with BZX84-C3V9/DG/B3,2, MMBZ5226BS-7-F offers identical voltage spec but requires higher test current for characterization, while BZX384-C3V9 provides greater power headroom in a physically larger package-selection depends on board area constraints and thermal design margin.

Availability

BZX84-C3V9/DG/B3,2 is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, ADC input clamping, and bias network stabilization requiring stable component supply and consistent parametric performance.

Supply support for BZX84-C3V9/DG/B3,2 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 standard logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered for stable voltage reference and clamping in cost-sensitive, space-constrained analog subsystems.

FAQ

What is the maximum continuous power dissipation for BZX84-C3V9/DG/B3,2?

The BZX84-C3V9/DG/B3,2 has a maximum total power dissipation of 250 mW at ambient temperature of 25 °C. Derating is required above this temperature per the device's thermal resistance curve, with typical derating starting at ~2.0 mW/°C above 25 °C in free-air conditions.

Is BZX84-C3V9/DG/B3,2 suitable for use as a voltage reference in precision analog circuits?

Yes-it delivers 3.9 V ±5% at 5 mA with 90 Ω dynamic impedance and +2.5 mV/K temperature coefficient, making it appropriate for non-critical reference roles such as reset thresholds, LED biasing, or coarse ADC scaling where ±5% tolerance is acceptable.

How does the SOT23 package affect thermal performance compared to larger packages?

The SOT23 package limits thermal dissipation due to small pad area and low thermal mass. At 250 mW, junction temperature rise can exceed 100 K above ambient without copper pour; PCB layout with thermal vias and extended copper is recommended for sustained operation.

Can BZX84-C3V9/DG/B3,2 replace BZX384-C3V9 in the same PCB footprint?

No-BZX84-C3V9/DG/B3,2 uses SOT23 (JEDEC TO-236AB), while BZX384-C3V9 uses SOD323. The footprints are mechanically incompatible: SOT23 has 0.95 mm lead pitch and 2.2 mm × 1.35 mm body; SOD323 measures 1.7 mm × 1.25 mm with 0.65 mm pitch.

BZX84-C3V9/DG/B3,2 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):: 3.9 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 90 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 1 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-C3V9/DG/B3,2 FAQ

1.How can I place an order for BZX84-C3V9/DG/B3,2 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-C3V9/DG/B3,2 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-C3V9/DG/B3,2 reliable?

The price and inventory of BZX84-C3V9/DG/B3,2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C3V9/DG/B3,2 is usually 5 days.

3.What payment methods are accepted for BZX84-C3V9/DG/B3,2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C3V9/DG/B3,2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-C3V9/DG/B3,2?

BZX84-C3V9/DG/B3,2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-C3V9/DG/B3,2 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-C3V9/DG/B3,2?

For technical support, including BZX84-C3V9/DG/B3,2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C3V9/DG/B3,2 requirements.

6.How does Aetrix verify that BZX84-C3V9/DG/B3,2 is sourced from the original manufacturer or authorized distributors?

All BZX84-C3V9/DG/B3,2 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-C3V9/DG/B3,2 meets industry standards.

7.What is the process for return or replacement of BZX84-C3V9/DG/B3,2?

All BZX84-C3V9/DG/B3,2 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C3V9/DG/B3,2, 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-C3V9/DG/B3,2 part is unused and in its original packaging.

Return procedure for BZX84-C3V9/DG/B3,2:

1.Submit a request within 90 days.

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

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