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

Nexperia USA Inc. BZX84-B4V7/DG/B3,2

Name: BZX84-B4V7/DG/B3,2
Brand: Nexperia USA Inc.
SKU: BZX84-B4V7/DG/B3,2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-B4V7/DG/B3,2

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-B4V7/DG/B3,2.pdf

Description:: DIODE ZENER 4.7V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:5,342

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Product details

Overview

BZX84-B4V7/DG/B3,2 from Nexperia is a 4.7 V ±2% tolerance Zener diode in SOT23 package, rated for 300 mW power dissipation and 5 mA test current, used for voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84-B4V7/DG/B3,2 datasheet, BZX84-B4V7/DG/B3,2 pinout, BZX84-B4V7/DG/B3,2 application, or BZX84-B4V7/DG/B3,2 equivalent, key considerations include Zener voltage tolerance, dynamic impedance at 5 mA, maximum reverse leakage at 1 V, power derating above 25°C, and SOT23 thermal resistance.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and supply conditions. It exhibits a nominal Zener voltage of 4.7 V with ±2% initial tolerance and a dynamic impedance of ≤90 Ω at I_Z = 5 mA.

Designed for surface-mount use in space-constrained PCBs, it supports continuous reverse operation up to 300 mW at T_amb = 25°C, with linear derating to zero power at 150°C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.7 V ±2% at I_Z = 5 mA - ensures precise clamping in 5 V rail monitoring
Power Dissipation (P_tot)	300 mW at T_amb = 25°C - limits thermal rise in compact SOT23 layout
Dynamic Impedance (Z_ZT)	≤90 Ω at I_Z = 5 mA - maintains voltage stability under small-signal load variation
Reverse Leakage (I_R)	≤5 µA at V_R = 1 V - minimizes standby current in battery-powered sensors
Package	SOT23 - enables automated placement and 0.95 mm pitch compatibility
Junction Temperature Range	−65°C to +150°C - supports industrial ambient operation without derating

Pinout & Package

SOT23-3 package with cathode-anode-anode terminal configuration; standardized footprint per JEDEC TO-236AB.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Cathode)	Zener anode connection point	Connected to regulated node; reverse-biased during operation
Pin 2 (Anode)	Zener cathode connection point	Typically grounded or tied to lower potential reference
Pin 3 (Anode)	Second anode terminal	Internally connected to Pin 2; provides mechanical stability and thermal path

Key Features

Feature	Design Value
Tight voltage tolerance	±2% at 5 mA - reduces calibration overhead in precision references
Low dynamic impedance	≤90 Ω - improves regulation against 10–100 µA load shifts
Controlled reverse leakage	≤5 µA @ 1 V - preserves battery life in always-on sensor nodes
SOT23 thermal performance	R_thJA = 400 K/W - allows 300 mW operation with <120°C junction rise at 25°C ambient

Applications

USB Port ESD Clamp

Microcontroller Reset Circuit

Use Scenario: Clamps transient voltages on USB D+ and D− lines during ESD events.

IC Role / Device Role / Timing Role: Zener-based shunt protector limiting line voltage to 4.7 V.

Use Value: Prevents damage to USB transceivers by diverting >8 kV HBM surges below IC absolute maximum ratings.

Use Scenario: Generates clean reset signal when 5 V supply drops below 4.5 V.

IC Role / Device Role / Timing Role: Reference element in RC-reset threshold detector.

Use Value: Enables deterministic microcontroller restart at 4.7 V ±2%, avoiding brown-out lockup.

Industrial Sensor Signal Conditioning

Low-Power IoT Node Voltage Reference

Use Scenario: Stabilizes excitation voltage for 4–20 mA loop sensors.

IC Role / Device Role / Timing Role: Precision shunt regulator for op-amp bias network.

Use Value: Maintains 4.7 V reference within ±2% across −40°C to +85°C, reducing gain drift.

Use Scenario: Supplies stable reference to ADC and LDO enable pin in coin-cell devices.

IC Role / Device Role / Timing Role: Low-leakage voltage clamp for supply rail supervision.

Use Value: Draws only 5 µA at 1 V reverse bias, extending 10-year battery life in wireless sensors.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C4V7,215	±5% tolerance, higher Z_ZT (≤100 Ω), same SOT23 package	Acceptable where 4.7 V ±5% meets system margin	Select for cost-sensitive designs with relaxed voltage accuracy
MMSZ4702T1G	±5% tolerance, 500 mW rating, SOD-123 package	Higher power handling but larger footprint and different thermal profile	Choose when >300 mW surge energy must be absorbed

Compared with BZX84-B4V7/DG/B3,2, the BZX84-C4V7,215 trades tighter voltage control for lower unit cost, while MMSZ4702T1G offers greater surge capability at the expense of board area and thermal resistance-making the original optimal for space-constrained, precision-clamp applications.

Availability

BZX84-B4V7/DG/B3,2 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset generation, and industrial sensor signal conditioning requiring stable component supply and consistent parametric performance.

Supply support for BZX84-B4V7/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 discrete and logic devices, headquartered in Nijmegen, Netherlands.

This device belongs to the BZX84 series of precision Zener diodes designed specifically for voltage reference and overvoltage protection in consumer, industrial, and automotive electronics with strict size and parametric constraints.

FAQ

What is the maximum reverse voltage this Zener can withstand before breakdown?

The BZX84-B4V7/DG/B3,2 has a nominal Zener voltage of 4.7 V at 5 mA test current, with guaranteed breakdown occurring between 4.61 V and 4.79 V. It is not rated for forward conduction or avalanche beyond its specified reverse operating range; exceeding 4.79 V continuously risks thermal runaway under unregulated current conditions.

Can this part replace a 5.1 V Zener in a 5 V rail clamp circuit?

No. With a nominal 4.7 V breakdown, this Zener clamps below the 5 V rail's typical operating window and may falsely trigger during normal ripple or startup transients. A 5.1 V Zener like BZX84-B5V1/DG/B3,2 is required to avoid premature conduction while maintaining adequate margin above 5 V.

Is the SOT23 package lead-free and RoHS compliant?

Yes. The BZX84-B4V7/DG/B3,2 is manufactured with lead-free terminations and complies with EU RoHS Directive 2011/65/EU and REACH SVHC regulations. Its solderability is qualified for standard SnPb and lead-free reflow profiles per J-STD-020, with moisture sensitivity level (MSL) 1.

How does temperature affect its Zener voltage stability?

This part has a positive temperature coefficient of approximately +2.5 mV/°C near 4.7 V, meaning its breakdown voltage increases linearly with junction temperature. Over −40°C to +125°C, total drift remains within ±0.15 V, supporting stable operation in unheated industrial enclosures without external compensation.

BZX84-B4V7/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):: 4.7 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 2 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-B4V7/DG/B3,2 FAQ

1.How can I place an order for BZX84-B4V7/DG/B3,2 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-B4V7/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-B4V7/DG/B3,2 reliable?

The price and inventory of BZX84-B4V7/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-B4V7/DG/B3,2 is usually 5 days.

3.What payment methods are accepted for BZX84-B4V7/DG/B3,2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B4V7/DG/B3,2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-B4V7/DG/B3,2?

BZX84-B4V7/DG/B3,2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-B4V7/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-B4V7/DG/B3,2?

For technical support, including BZX84-B4V7/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-B4V7/DG/B3,2 requirements.

6.How does Aetrix verify that BZX84-B4V7/DG/B3,2 is sourced from the original manufacturer or authorized distributors?

All BZX84-B4V7/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-B4V7/DG/B3,2 meets industry standards.

7.What is the process for return or replacement of BZX84-B4V7/DG/B3,2?

All BZX84-B4V7/DG/B3,2 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B4V7/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-B4V7/DG/B3,2 part is unused and in its original packaging.

Return procedure for BZX84-B4V7/DG/B3,2:

1.Submit a request within 90 days.

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

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