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

Nexperia USA Inc. BZX84-C43,215

Name: BZX84-C43,215
Brand: Nexperia USA Inc.
SKU: BZX84-C43,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-C43,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-C43,215.pdf

Description:: DIODE ZENER 43V 250MW TO236AB

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Inventory:9,047

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Product details

Overview

BZX84-C43,215 from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 43 V nominal breakdown voltage at 2 mA test current, 375 Ω maximum differential resistance, and 150 μA reverse current at 34.4 V, used for precision low-power voltage reference and overvoltage clamping in power supply feedback paths.

For engineers reviewing the BZX84-C43,215 datasheet, BZX84-C43,215 pinout, BZX84-C43,215 application, or BZX84-C43,215 equivalent, key selection criteria include Zener voltage tolerance (±5 %), thermal resistance (330 K/W junction-to-solder-point), non-repetitive peak reverse current (0.6 A), differential resistance (375 Ω), and SOT23 footprint compatibility with automated PCB assembly.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its specified Zener breakdown threshold. Its behavior is defined by temperature-dependent voltage coefficient (+0.05 mV/K), low capacitance (40 pF at 0 V), and controlled dynamic impedance under regulated bias conditions.

The diode exhibits non-repetitive surge capability up to 40 W for 100 μs pulses, with absolute maximum ratings including 200 mA forward current, 150 °C junction temperature, and -55 °C to +150 °C ambient operating range - all validated per IEC 60134 limiting values.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	40.0 V to 46.0 V at I_Z = 2 mA - defines regulation window for feedback loop stability
Differential Resistance (r_dif)	≤375 Ω - determines load regulation error under varying current draw
Reverse Current (I_R)	≤150 μA at V_R = 34.4 V - sets minimum bias current for reliable turn-on
Forward Voltage (V_F)	≤0.9 V at I_F = 10 mA - limits conduction loss during forward-biased transient events
Total Power Dissipation (P_tot)	250 mW at T_amb ≤ 25 °C on FR4 PCB - constrains continuous thermal design margin
Non-repetitive Peak Reverse Current (I_ZSM)	0.6 A for t_p = 100 μs - enables transient overvoltage suppression without failure
Junction-to-Solder-Point Thermal Resistance (R_th(j-sp))	330 K/W - quantifies heat transfer efficiency from die to PCB copper pour

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; compact 2.9 mm × 1.3 mm footprint, 1.1 mm height, and standard reflow-compatible solder land pattern.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Forward-biased terminal; connects to lower-potential node in shunt regulation configuration
2	Not Connected (n.c.)	Internal die pad with no electrical bond; must remain unconnected on PCB layout
3	Cathode (K)	Zener breakdown terminal; connects to regulated voltage node and current-limiting resistor

Key Features

Feature	Design Value
±5 % Zener voltage tolerance	Enables cost-effective voltage referencing where tight regulation is not critical, e.g., non-precision power rail monitoring
250 mW total power dissipation	Supports continuous operation in space-constrained consumer and industrial PCBs without forced cooling
330 K/W junction-to-solder-point thermal resistance	Allows direct thermal coupling to PCB copper for passive heat sinking in low-duty-cycle applications
0.6 A non-repetitive peak reverse current	Provides robust ESD and surge immunity in I/O protection circuits without external TVS stacking
40 pF diode capacitance at 0 V	Minimizes signal distortion in high-frequency clamp applications such as analog sensor interface protection

Applications

Power Supply Feedback Regulation

Overvoltage Clamp Protection

Use Scenario: Stabilizing output voltage of isolated DC-DC converters via optocoupler feedback loop.

IC Role / Device Role / Timing Role: Shunt reference providing precise 43 V threshold to control primary-side PWM duty cycle.

Use Value: Maintains ±2 % output accuracy across line/load variations using only passive components and no dedicated reference IC.

Use Scenario: Protecting microcontroller GPIO pins from accidental 48 V bus exposure in industrial fieldbus nodes.

IC Role / Device Role / Timing Role: Fast-acting voltage clamp diverting transient energy before IC damage occurs.

Use Value: Limits pin voltage to ≤46 V during 100 μs surges, eliminating need for larger-footprint TVS diodes.

Low-Power Reference Source

Signal Level Translation

Use Scenario: Generating stable bias voltage for op-amp comparators in battery-powered sensor conditioners.

IC Role / Device Role / Timing Role: Passive voltage reference establishing trip point for analog threshold detection.

Use Value: Delivers 43 V reference with <100 ppm/°C drift over -40 °C to +85 °C, reducing calibration frequency.

Use Scenario: Converting 48 V CAN transceiver logic levels to 3.3 V MCU input thresholds in automotive body control modules.

IC Role / Device Role / Timing Role: Bidirectional level-shifter using Zener clamping and series resistor.

Use Value: Enables safe interfacing without active translators, leveraging 43 V breakdown to limit high-side swing.

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 MMBZ43VCLT1G	Same 43 V nominal Zener voltage, ±5 % tolerance, but rated for 225 mW P_tot and 300 Ω r_dif	Lower power rating reduces thermal headroom in sustained 5 mA bias conditions	Select when tighter differential resistance is required and power budget allows derating
Vishay BZX84-C43-TP	Identical 40–46 V V_Z range and 375 Ω r_dif, but specified for 200 mW P_tot and higher 200 μA I_R at V_R = 34.4 V	Higher leakage increases quiescent current in always-on reference circuits	Prefer for cost-sensitive designs where minor leakage increase is acceptable

Compared with BZX84-C43,215, MMBZ43VCLT1G offers lower impedance but reduced power handling, while BZX84-C43-TP matches regulation specs but trades off leakage performance for broader supply chain availability - making the Nexperia part optimal for thermally constrained, low-leakage 43 V reference use cases.

Availability

BZX84-C43,215 is available at Aetrix Electronics and suitable for power supply feedback regulation, overvoltage clamp protection, and low-power reference source applications requiring stable component supply, consistent parametric performance, and SOT23 footprint compatibility.

Supply support for BZX84-C43,215 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 leading semiconductor manufacturer specializing in high-volume, high-reliability discrete and logic devices, headquartered in Nijmegen, Netherlands.

The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered for cost-efficient voltage regulation and clamping in consumer, industrial, and communication equipment where ±5 % tolerance and SOT23 scalability are prioritized.

FAQ

What is the maximum continuous Zener current for BZX84-C43,215 at 70 °C ambient?

At 70 °C ambient, derated power dissipation is approximately 175 mW (based on 250 mW at 25 °C and 500 K/W junction-to-ambient thermal resistance). With a 43 V Zener voltage, this supports a maximum continuous Zener current of ~4.1 mA - sufficient for most feedback and reference applications without active cooling.

Can BZX84-C43,215 be used in place of a 42 V or 44 V Zener diode?

No - BZX84-C43,215 is specifically characterized for 40.0 V to 46.0 V breakdown at 2 mA, with guaranteed distribution centered on 43 V. Substituting for 42 V or 44 V types risks violating regulation accuracy requirements, as adjacent E24 values (e.g., BZX84-C42 or BZX84-C44) have distinct test conditions and parameter spreads.

Is Pin 2 internally connected or truly floating?

Pin 2 is explicitly marked "n.c." (not connected) in Nexperia's official pinning diagram and package documentation. It is an un-bonded lead frame tab with no internal die connection - PCB layout must leave it unconnected to avoid unintended parasitic coupling or solder bridging.

How does temperature affect the 43 V regulation point in practical circuits?

The BZX84-C43,215 has a positive temperature coefficient of +0.05 mV/K, meaning its Zener voltage increases by ~2.15 mV per 10 °C rise. Over a -40 °C to +125 °C junction range, this results in a total shift of ~8.3 V - a critical factor when designing for wide-temperature operation, requiring compensation or margining in feedback networks.

BZX84-C43,215 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:: ±5%

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-C43,215 FAQ

1.How can I place an order for BZX84-C43,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-C43,215 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-C43,215 reliable?

The price and inventory of BZX84-C43,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C43,215 is usually 5 days.

3.What payment methods are accepted for BZX84-C43,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C43,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-C43,215?

BZX84-C43,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-C43,215 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-C43,215?

For technical support, including BZX84-C43,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C43,215 requirements.

6.How does Aetrix verify that BZX84-C43,215 is sourced from the original manufacturer or authorized distributors?

All BZX84-C43,215 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-C43,215 meets industry standards.

7.What is the process for return or replacement of BZX84-C43,215?

All BZX84-C43,215 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C43,215, 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-C43,215 part is unused and in its original packaging.

Return procedure for BZX84-C43,215:

1.Submit a request within 90 days.

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

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