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

Nexperia USA Inc. BZX84-B43,215

Name: BZX84-B43,215
Brand: Nexperia USA Inc.
SKU: BZX84-B43,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-B43,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-B43,215.pdf

Description:: DIODE ZENER 43V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:1,895

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Product details

Overview

BZX84-B43,215 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 43 V nominal breakdown voltage at 2 mA test current, with 250 mW total power dissipation and 40 W non-repetitive peak reverse power capability. It serves as a precision reference or overvoltage clamp in low-power analog and digital supply rails.

For engineers reviewing the BZX84-B43,215 datasheet, BZX84-B43,215 pinout, BZX84-B43,215 application, or BZX84-B43,215 equivalent, key selection considerations include its 43 V Zener voltage tolerance, thermal resistance (R_th(j-a) = 500 K/W), differential resistance (≤375 Ω), temperature coefficient (±0.05 mV/K), and SOT23 mounting compatibility with standard FR4 PCB layouts.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain stable voltage across load variations, with regulation defined at I_Z = 2 mA per JEDEC-compliant test conditions. Its low 250 mW steady-state dissipation requires careful thermal design on standard FR4 boards.

The device exhibits a typical temperature coefficient of ±0.05 mV/K at I_Z = 2 mA, enabling predictable drift compensation in reference circuits. Non-repetitive surge handling up to 40 W (100 μs pulse) supports transient overvoltage protection in low-energy signal paths.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	42.1 V to 43.9 V at I_Z = 2 mA - defines regulated output range under nominal bias
Differential Resistance (r_dif)	≤375 Ω at I_Z = 2 mA - determines regulation stiffness against load current changes
Reverse Current (I_R)	≤150 μA at V_R = 40 V - specifies leakage before breakdown onset
Total Power Dissipation (P_tot)	250 mW at T_amb ≤ 25 °C on FR4 PCB - sets maximum continuous DC power limit
Non-repetitive Peak Power (P_ZSM)	40 W for t_p = 100 μs - enables short-duration surge clamping without failure
Junction Temperature (T_j)	−55 °C to +150 °C - constrains operating envelope for reliability in industrial environments
Thermal Resistance (R_th(j-a))	500 K/W in free air - quantifies self-heating rise per watt dissipated on standard PCB

Pinout & Package

Package: SOT23 (TO-236AB), surface-mount plastic package with 3 leads, 1.9 mm × 1.1 mm footprint, 0.45 mm max height, and tin-plated terminations compatible with reflow and wave soldering per Figures 12–13.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential side of regulated node; forward-biased during normal operation
2	Not Connected (n.c.)	Internally unconnected lead; must remain floating-no PCB trace or pad required
3	Cathode (K)	Connected to higher-potential side; reverse-biased during regulation; primary heat path to PCB

Key Features

Feature	Design Value
±2 % Zener voltage tolerance	Enables tighter regulation than ±5 % variants (BZX84-C) without premium ±1 % cost
43 V nominal breakdown voltage	Matches common 42 V automotive subsystem rails and industrial 48 V intermediate bus references
250 mW steady-state power rating	Supports regulation in low-current sensor interfaces, microcontroller reset circuits, and bias networks
40 W non-repetitive surge capability	Clamps ESD transients and inductive kickback in signal-level protection without derating
SOT23 footprint compatibility	Integrates into space-constrained designs using industry-standard pick-and-place and reflow processes

Applications

Power Supply Reference

Overvoltage Clamp

Use Scenario: Stabilizing feedback voltage in linear regulators or switching converter error amplifiers.

IC Role / Device Role / Timing Role: Provides fixed reference voltage to comparator input; replaces external resistor divider for improved accuracy.

Use Value: Delivers 43 V reference with ±2 % tolerance and <0.1 %/°C drift, reducing output variation across −40 °C to +85 °C ambient.

Use Scenario: Protecting ADC inputs or logic pins from transient overvoltage events.

IC Role / Device Role / Timing Role: Shunts excess energy above 43 V to ground during fast-rising spikes.

Use Value: Limits voltage to ≤43.9 V within 100 ns using 40 W surge rating, preventing latch-up or gate oxide damage in downstream ICs.

Signal-Level Voltage Clamp

Microcontroller Reset Circuit

Use Scenario: Conditioning analog sensor outputs (e.g., 4–20 mA loop receivers) to prevent rail-to-rail swing.

IC Role / Device Role / Timing Role: Clips negative excursions below cathode potential and positive excursions above 43 V.

Use Value: Maintains signal integrity with <150 μA leakage at 40 V, avoiding loading errors in high-impedance sensor nodes.

Use Scenario: Generating clean power-on reset pulses for ARM Cortex-M or PIC microcontrollers.

IC Role / Device Role / Timing Role: Holds reset line low until supply reaches stable 43 V threshold via RC delay network.

Use Value: Ensures deterministic reset assertion with 2 mA regulation current, eliminating false triggers from brown-out conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBZ5257BS-7-F	43 V ±5 % tolerance; 350 mW P_tot; SOT23 package; 500 Ω r_dif	Higher power but looser tolerance; less stable reference in precision circuits	Select when cost sensitivity outweighs voltage accuracy requirements
Vishay BZX84-C43-TP	43 V ±5 % tolerance; 300 mW P_tot; same SOT23 footprint; 400 Ω r_dif	Higher leakage (≤500 μA at 34.4 V); wider V_Z spread reduces predictability in cascaded references	Choose only for non-critical clamping where 43 V nominal suffices and 250 mW margin is unnecessary

Compared with BZX84-B43,215, the ON Semiconductor part offers higher power headroom but sacrifices regulation precision, while the Vishay variant trades tighter thermal control for broader voltage tolerance-making the Nexperia device optimal for applications demanding both stability and compactness.

Availability

BZX84-B43,215 is available at Aetrix Electronics and suitable for industrial sensor interfaces, embedded microcontroller reset circuits, and analog signal conditioning requiring stable component supply with consistent ±2 % voltage tolerance and SOT23 manufacturability.

Supply support for BZX84-B43,215 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 and miniaturization in consumer, industrial, and communications markets.

The BZX84 series belongs to Nexperia's precision Zener regulator portfolio, engineered for low-power voltage reference and clamping in space-constrained, cost-sensitive applications where ±1 % to ±5 % tolerance grades meet system-level accuracy needs.

FAQ

What is the maximum continuous reverse current this diode can sustain at 43 V?

The BZX84-B43,215 is not rated for continuous conduction at 43 V. Its maximum steady-state reverse current is limited by power dissipation: at 43 V, I_Z must stay ≤5.8 mA to remain within 250 mW (P = V × I). Operation above this draws excessive power, risking thermal runaway unless heatsinking is added.

Can this Zener diode replace a 42 V TVS for ESD protection?

No. While it handles 40 W non-repetitive surges, the BZX84-B43,215 lacks the low clamping voltage, fast response (<1 ns), and standardized ESD waveform ratings (IEC 61000-4-2) of dedicated TVS diodes. It may fail catastrophically under repeated 8 kV contact discharge due to insufficient surge lifetime rating.

Does the n.c. pin require PCB routing or grounding?

No. Pin 2 is internally unconnected per Table 2 and Figure 11. It must remain electrically isolated-no copper pour, trace, or solder mask opening should contact it. Including it in layout footprints risks mechanical stress or solder bridging without functional benefit.

How does temperature affect regulation accuracy across −40 °C to +125 °C?

At I_Z = 2 mA, the temperature coefficient is ±0.05 mV/K. Over 165 °C range, worst-case drift is ±8.25 mV (0.019 % of 43 V), yielding final V_Z between 42.09 V and 43.91 V. This remains within the ±2 % initial tolerance band, preserving system-level accuracy.

BZX84-B43,215 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):: 43 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 150 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 30.1 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-B43,215 FAQ

1.How can I place an order for BZX84-B43,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-B43,215 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-B43,215 reliable?

The price and inventory of BZX84-B43,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-B43,215 is usually 5 days.

3.What payment methods are accepted for BZX84-B43,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B43,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-B43,215?

BZX84-B43,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-B43,215 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-B43,215?

For technical support, including BZX84-B43,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-B43,215 requirements.

6.How does Aetrix verify that BZX84-B43,215 is sourced from the original manufacturer or authorized distributors?

All BZX84-B43,215 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-B43,215 meets industry standards.

7.What is the process for return or replacement of BZX84-B43,215?

All BZX84-B43,215 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B43,215, 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-B43,215 part is unused and in its original packaging.

Return procedure for BZX84-B43,215:

1.Submit a request within 90 days.

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

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