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

Nexperia USA Inc. BZX84-B4V3,215

Name: BZX84-B4V3,215
Brand: Nexperia USA Inc.
SKU: BZX84-B4V3,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-B4V3,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-B4V3,215.pdf

Description:: DIODE ZENER 4.3V 250MW TO236AB

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Product details

Overview

BZX84-B4V3,215 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, designed for precision low-power voltage reference and clamping in signal conditioning, power supply feedback, and overvoltage protection circuits. It delivers 4.3 V nominal Zener voltage at 5 mA test current, with 90 Ω typical differential resistance, 3 µA max reverse leakage at 1 V, and operates across –55 °C to +150 °C ambient.

For engineers reviewing the BZX84-B4V3,215 datasheet, BZX84-B4V3,215 pinout, BZX84-B4V3,215 application, or BZX84-B4V3,215 equivalent, this page provides verified Zener voltage, thermal resistance, peak surge capability, cathode/anode terminal mapping, and direct-fit alternatives for voltage reference design validation and BOM optimization.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable DC reference voltage under varying load and temperature conditions. Its 4.3 V nominal Zener voltage is specified at I_Z = 5 mA, with a temperature coefficient of –3.5 mV/K and differential resistance ≤90 Ω, enabling predictable regulation in feedback loops and analog sensing paths.

The device uses silicon planar epitaxial construction for repeatable breakdown characteristics and integrates into compact PCB layouts via its 3-pin SOT23 footprint. With non-repetitive peak reverse power dissipation of 40 W (100 µs pulse), it supports transient overvoltage suppression without latch-up or permanent degradation.

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 tight regulation window for feedback accuracy in 5 V rail monitoring
Differential Resistance (r_dif)	≤90 Ω - ensures minimal output voltage shift under load current variation up to 10 mA
Reverse Leakage (I_R)	≤3 µA at V_R = 1 V - guarantees low quiescent current draw in battery-powered voltage monitor circuits
Total Power Dissipation (P_tot)	250 mW at T_amb ≤ 25 °C on FR4 PCB - sets maximum continuous DC power handling in standard layout
Non-repetitive Peak Power (P_ZSM)	40 W for t_p = 100 µs - enables single-event ESD/inductive spike clamping without failure
Junction-to-Ambient R_th(j-a)	500 K/W - determines steady-state temperature rise above ambient at full 250 mW load
Operating Temperature Range	–55 °C to +150 °C - supports industrial and automotive-adjacent environments without derating

Pinout & Package

Package: SOT23 (TO-236AB), 3-lead surface-mount plastic package with 1.3 mm pitch, 2.9 mm × 1.3 mm body, and 1.1 mm height. Designed for reflow and wave soldering per IPC-7095 guidelines.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential node in reverse-biased configuration; carries forward current during fault conditions
2	Not Connected (n.c.)	Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or thermal path disruption
3	Cathode (K)	Connected to regulated output node; serves as reference point for Zener voltage measurement and feedback injection

Key Features

Feature	Design Value
±2 % Zener voltage tolerance	Enables tighter regulation than ±5 % variants, reducing need for post-production trimming in 3.3 V/5 V supply monitors
Low 90 Ω differential resistance	Maintains <±20 mV output deviation across 1–10 mA load range, critical for ADC reference stability
40 W non-repetitive surge rating	Clamps 1 kV ESD transients (IEC 61000-4-2 Level 4) without parameter shift when used with series current limiting
150 °C maximum junction temperature	Supports operation in sealed enclosures or near heat-generating components without thermal shutdown risk
SOT23 footprint compatibility	Allows drop-in replacement with other BZX84-B variants and interoperability with standard pick-and-place equipment

Applications

Power Supply Feedback

Overvoltage Protection

Use Scenario: Regulating output voltage in adjustable linear regulators (e.g., LM317) or switching converter feedback networks.

IC Role / Device Role / Timing Role: Zener diode provides precise 4.3 V reference voltage to error amplifier input, setting output setpoint.

Use Value: Tight ±2 % tolerance and low r_dif ensure output accuracy remains within ±1.5 % across line/load/temperature variations.

Use Scenario: Clamping transient voltages on microcontroller I/O lines or sensor inputs exposed to inductive kickback.

IC Role / Device Role / Timing Role: Acts as shunt protector by conducting above 4.3 V, diverting surge current away from sensitive circuitry.

Use Value: 40 W peak power rating allows safe absorption of 100 µs surges up to 1.2 A without degradation.

Reference Voltage Source

Signal Level Shifting

Use Scenario: Generating stable bias points for op-amp comparators or analog front-end circuits in data acquisition systems.

IC Role / Device Role / Timing Role: Provides low-drift 4.3 V reference for threshold detection, replacing higher-cost precision references where ±2 % is acceptable.

Use Value: –3.5 mV/K temperature coefficient yields only –17.5 mV drift over 50 °C ambient change, minimizing calibration frequency.

Use Scenario: Translating logic-level signals between 3.3 V and 5 V domains using simple resistor-Zener interface networks.

IC Role / Device Role / Timing Role: Sets clamping ceiling at 4.3 V to prevent 5 V logic from overdriving 3.3 V input pins.

Use Value: Low 3 µA leakage at 1 V ensures negligible loading on source drivers, preserving signal integrity and timing margins.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBZ5227BS-7-F	4.3 V ±5 %, 200 mW P_tot, 100 Ω r_dif, SOT23 package	Looser tolerance and higher r_dif reduce regulation accuracy but improve cost-effectiveness in non-critical rails	Select when ±5 % voltage accuracy suffices and legacy ON Semi sourcing is preferred
Vishay BZX84-C4V3-TP	4.0 V to 4.6 V (±5 %), 350 mW P_tot, 90 Ω r_dif, same SOT23 footprint	Wider voltage spread increases design margin but requires verification of worst-case regulation at system level	Choose for higher power headroom in high-temperature environments where 350 mW derating is needed

Compared with BZX84-B4V3,215, MMBZ5227BS-7-F trades voltage precision for broader supplier availability, while BZX84-C4V3-TP offers greater thermal margin at the expense of guaranteed 4.3 V regulation-making the BZX84-B4V3,215 optimal for designs requiring deterministic 4.3 V reference with minimal drift.

Availability

BZX84-B4V3,215 is available at Aetrix Electronics and suitable for voltage reference generation, overvoltage clamping, and power supply feedback circuits requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for BZX84-B4V3,215 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, reliable discrete, logic, and MOSFET devices optimized for efficiency, miniaturization, and robustness in mass-market electronics.

The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered specifically for low-power voltage regulation and protection in space-constrained consumer, industrial, and computing applications.

FAQ

What is the maximum continuous Zener current for BZX84-B4V3,215?

The absolute maximum forward current is 200 mA, but continuous Zener operation is limited by power dissipation. At 25 °C ambient on a standard FR4 PCB, the 250 mW total power rating restricts I_Z to approximately 58 mA (250 mW ÷ 4.3 V). Derating is required above 25 °C per the 500 K/W thermal resistance.

Can BZX84-B4V3,215 replace BZX84-A4V3 in existing designs?

Yes, but with trade-offs: BZX84-B4V3,215 has ±2 % tolerance versus ±1 % for the 'A' grade, resulting in a wider 4.21–4.39 V range versus 4.25–4.35 V. Differential resistance is identical (≤90 Ω), so regulation stability is preserved, but precision feedback loops may require recalibration.

Is Pin 2 truly unused, or does it serve a mechanical function?

Pin 2 is electrically not connected (n.c.) per Nexperia's official pinning diagram and internal construction. It serves no electrical role and must remain unconnected on the PCB. Its presence aids mechanical stability during automated placement and reflow, but no trace or pad should be routed to it.

How does thermal resistance impact real-world regulation accuracy?

With R_th(j-a) = 500 K/W, dissipating 150 mW raises junction temperature by 75 °C above ambient. Since the Zener voltage has a –3.5 mV/K coefficient, this causes a –262.5 mV shift - nearly 6 % of 4.3 V. Therefore, maintaining low power dissipation or improving heatsinking is essential for stable reference performance.

BZX84-B4V3,215 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-B4V3,215 FAQ

1.How can I place an order for BZX84-B4V3,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-B4V3,215 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-B4V3,215 reliable?

The price and inventory of BZX84-B4V3,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-B4V3,215 is usually 5 days.

3.What payment methods are accepted for BZX84-B4V3,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B4V3,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-B4V3,215?

BZX84-B4V3,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-B4V3,215 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-B4V3,215?

For technical support, including BZX84-B4V3,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-B4V3,215 requirements.

6.How does Aetrix verify that BZX84-B4V3,215 is sourced from the original manufacturer or authorized distributors?

All BZX84-B4V3,215 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-B4V3,215 meets industry standards.

7.What is the process for return or replacement of BZX84-B4V3,215?

All BZX84-B4V3,215 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B4V3,215, 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-B4V3,215 part is unused and in its original packaging.

Return procedure for BZX84-B4V3,215:

1.Submit a request within 90 days.

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

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