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

Nexperia USA Inc. BZX84-B4V3,235

Name: BZX84-B4V3,235
Brand: Nexperia USA Inc.
SKU: BZX84-B4V3,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-B4V3,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-B4V3,235.pdf

Description:: DIODE ZENER 4.3V 250MW TO236AB

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Product details

Overview

BZX84-B4V3,235 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 4.3 V nominal breakdown voltage at 5 mA, 250 mW total power dissipation, and 40 W non-repetitive peak reverse power. It serves as a precision reference or overvoltage clamp in low-power analog supply rails and signal-level protection circuits.

For engineers reviewing the BZX84-B4V3,235 datasheet, BZX84-B4V3,235 pinout, BZX84-B4V3,235 application, or BZX84-B4V3,235 equivalent, key selection criteria include Zener voltage tolerance (±2 %), thermal resistance (330 K/W junction-to-solder point), differential resistance (≤90 Ω at 5 mA), reverse current (≤3 μA at 1 V), and SOT23 footprint compatibility with high-density PCB layouts.

Technical Context

This device operates in reverse-bias breakdown mode to maintain stable voltage across its cathode-anode terminals under varying load or input conditions. Its Zener mechanism delivers predictable regulation with temperature coefficient of −3.5 mV/K at 5 mA and diode capacitance of 450 pF at 0 V.

Designed for surface-mount assembly on FR4 PCBs with single-sided 70 µm copper, it supports pulse operation up to 40 W (100 µs, square wave) and continuous DC operation up to 250 mW at Tamb ≤ 25 °C, with maximum junction temperature of 150 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.21 V to 4.39 V at I_Z = 5 mA - defines regulation setpoint with ±2 % tolerance for stable reference generation
Differential Resistance (r_dif)	≤90 Ω at I_Z = 5 mA - determines output impedance and load regulation error under current variation
Reverse Current (I_R)	≤3 μA at V_R = 1 V - ensures minimal leakage in standby or high-impedance bias networks
Total Power Dissipation (P_tot)	250 mW at T_amb ≤ 25 °C on standard FR4 PCB - sets maximum continuous DC power handling in typical board layout
Non-repetitive Peak Reverse Power (P_ZSM)	40 W at t_p = 100 μs - enables transient surge suppression without device failure
Junction-to-Solder Point Thermal Resistance (R_th(j-sp))	330 K/W - quantifies heat transfer efficiency from die to cathode solder joint, critical for thermal design margin
Forward Voltage (V_F)	≤0.9 V at I_F = 10 mA - defines conduction loss when used in forward-biased protection or clamping roles

Pinout & Package

Package: SOT23 (TO-236AB), 3-lead surface-mount plastic package with standard footprint per Figure 12 (reflow) and Figure 13 (wave) in datasheet Rev. 7.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Positive terminal in forward bias; connected to lower-potential node during Zener regulation
2	Not Connected (n.c.)	Internal floating lead - must remain unconnected on PCB; no electrical function or thermal path
3	Cathode (K)	Negative terminal in forward bias; connected to higher-potential node during Zener regulation; primary thermal path to PCB

Key Features

Feature	Design Value
±2 % Zener voltage tolerance	Enables tighter regulation accuracy than ±5 % variants, suitable for mid-precision references in sensor interfaces and ADC biasing
250 mW continuous power rating	Supports stable DC regulation in low-current applications such as microcontroller reset circuits and op-amp reference dividers
40 W non-repetitive surge capability	Provides robust ESD and transient immunity without external TVS, reducing component count in I/O protection schemes
SOT23 footprint compatibility	Ensures drop-in replacement in space-constrained designs and leverages mature reflow/wave soldering processes
−3.5 mV/K temperature coefficient	Delivers predictable voltage drift over temperature, enabling compensation in analog front-ends requiring moderate stability

Applications

Power Supply Reference

Signal-Level Clamp

Use Scenario: Providing stable 4.3 V reference for analog-to-digital converter (ADC) biasing in battery-powered IoT sensor nodes.

IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference voltage at ADC input divider network.

Use Value: Maintains <±10 mV regulation error across 0–70 °C ambient range due to known temperature coefficient and low differential resistance.

Use Scenario: Limiting RS-232 receiver input voltage to prevent damage from ±12 V line transients.

IC Role / Device Role / Timing Role: Bidirectional clamping device-forward-biased anode-to-ground and reverse-biased cathode-to-V_CC rail.

Use Value: Clamps positive excursions to ~5.2 V (4.3 V + 0.9 V V_F) and negative excursions to −0.7 V, protecting CMOS inputs within safe absolute maximum ratings.

Overvoltage Protection

Low-Power Voltage Monitor

Use Scenario: Safeguarding 3.3 V microcontroller GPIO pins against accidental 5 V misconnection during field servicing.

IC Role / Device Role / Timing Role: Shunt regulator placed between GPIO and ground, conducting only above 4.3 V threshold.

Use Value: Limits pin voltage to ≤4.39 V while sinking up to 200 mA peak current, preventing latch-up or oxide damage without active circuitry.

Use Scenario: Detecting brown-out condition in 5 V system by monitoring regulated 4.3 V node with comparator.

IC Role / Device Role / Timing Role: Precision voltage source feeding comparator hysteresis network to trigger reset at defined undervoltage threshold.

Use Value: Delivers repeatable trip point with <±86 mV total error (±2 % V_Z + temp drift), eliminating need for trimming resistors.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBZ5225B	4.3 V nominal, ±5 % tolerance, 350 mW P_tot, SOT23 package	Higher power rating but looser tolerance; less stable reference, better for coarse clamping	Select when surge energy absorption >250 mW is required and ±2 % accuracy is not critical
Vishay BZX84-C4V3	4.0 V to 4.6 V range (±5 %), same SOT23 package, 250 mW P_tot	Wider voltage spread increases uncertainty in reference or threshold setting	Choose only for cost-sensitive, non-critical biasing where ±5 % variation is acceptable

Compared with MMBZ5225B and BZX84-C4V3, BZX84-B4V3,235 offers superior voltage accuracy (±2 % vs ±5 %) and tighter differential resistance (≤90 Ω vs ≥150 Ω), making it preferred for analog references and precision threshold detection-while maintaining identical SOT23 footprint and thermal performance.

Availability

BZX84-B4V3,235 is available at Aetrix Electronics and suitable for low-power voltage reference, signal-level clamping, and overvoltage protection applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.

Supply support for BZX84-B4V3,235 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 delivering high-performance logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for consumer, industrial, and communications markets.

BZX84-B4V3,235 belongs to the BZX84 series of low-power Zener diodes designed specifically for compact, cost-effective voltage regulation and protection in space-constrained SMT applications across portable electronics and industrial control systems.

FAQ

What is the maximum continuous reverse current this diode can handle at 4.3 V?

The BZX84-B4V3,235 is not rated for continuous reverse current at its Zener voltage. At V_R = 4.3 V, it operates in breakdown and conducts whatever current the external circuit imposes-limited only by its 250 mW power rating. For sustained operation, I_Z must stay ≤58 mA (250 mW ÷ 4.3 V) to avoid thermal runaway.

Can this part replace a BZX84-A4V3 in a precision reference circuit?

No-BZX84-A4V3 has ±1 % tolerance (4.25–4.35 V), while BZX84-B4V3,235 has ±2 % (4.21–4.39 V). The wider tolerance introduces up to 140 mV additional uncertainty in the reference voltage, which may exceed error budgets in high-resolution ADC or precision op-amp applications.

Is Pin 2 electrically isolated or internally bonded?

Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia datasheet. It is an internal floating lead with no electrical connection to the die or package substrate-no bonding wire, no metallization, and zero functional or thermal contribution. PCB land should be omitted or left unconnected.

Does this Zener diode meet automotive qualification standards?

No-per Nexperia's Revision History (Section 13), the BZX84 series was changed to non-automotive qualification in Rev. 7 (2023). It lacks AEC-Q101 stress testing and is not approved for use in automotive safety-critical or engine-control applications. Automotive-grade alternatives require explicit "-Q" suffix parts.

BZX84-B4V3,235 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):: 4.3 V

Tolerance:: ±2%

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BZX84-B4V3,235 FAQ

1.How can I place an order for BZX84-B4V3,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-B4V3,235 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-B4V3,235 reliable?

The price and inventory of BZX84-B4V3,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-B4V3,235 is usually 5 days.

3.What payment methods are accepted for BZX84-B4V3,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B4V3,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-B4V3,235?

BZX84-B4V3,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-B4V3,235 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-B4V3,235?

For technical support, including BZX84-B4V3,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-B4V3,235 requirements.

6.How does Aetrix verify that BZX84-B4V3,235 is sourced from the original manufacturer or authorized distributors?

All BZX84-B4V3,235 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-B4V3,235 meets industry standards.

7.What is the process for return or replacement of BZX84-B4V3,235?

All BZX84-B4V3,235 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B4V3,235, 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-B4V3,235 part is unused and in its original packaging.

Return procedure for BZX84-B4V3,235:

1.Submit a request within 90 days.

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

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