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

Nexperia USA Inc. BZX84-B15,235

Name: BZX84-B15,235
Brand: Nexperia USA Inc.
SKU: BZX84-B15,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-B15,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-B15,235.pdf

Description:: DIODE ZENER 15V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:8,864

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Product details

Overview

BZX84-B15,235 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 15 V nominal breakdown voltage at 5 mA, 250 mW total power dissipation, and 75 Ω maximum differential resistance - used for precision low-power voltage reference and overvoltage protection in sensor biasing, power supply feedback, and microcontroller I/O clamping circuits.

For engineers reviewing the BZX84-B15,235 datasheet, BZX84-B15,235 pinout, BZX84-B15,235 application, or BZX84-B15,235 equivalent, key selection factors include Zener voltage tolerance (±2 %), thermal resistance (330 K/W to solder point), non-repetitive surge capability (75 A peak reverse current), and SOT23 footprint compatibility with high-density PCB layouts.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable 15 V output across load variations by conducting reverse current above its specified Zener knee voltage. Its temperature coefficient of +9.2 mV/K at 5 mA enables predictable drift compensation in temperature-sensitive references.

The SOT23 package features an isolated cathode terminal (Pin 3), anode (Pin 1), and unconnected lead (Pin 2), enabling compact layout while supporting reflow and wave soldering per IPC-7095 guidelines. Thermal performance is defined with FR4 PCB mounting (single-sided 70 µm copper, tin-plated).

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	14.7 V to 15.3 V at I_Z = 5 mA - ensures ±2 % regulation accuracy for stable reference generation
Differential Resistance (r_dif)	≤75 Ω at I_Z = 5 mA - limits output voltage variation under dynamic load changes
Reverse Current (I_R)	≤0.05 µA at V_R = 11.4 V - guarantees minimal leakage in standby or high-impedance sensing nodes
Non-repetitive Peak Reverse Current (I_ZSM)	2.0 A at t_p = 100 µs - supports transient overvoltage suppression without failure
Total Power Dissipation (P_tot)	250 mW at T_amb ≤ 25 °C - defines continuous DC power handling on standard FR4 PCB
Thermal Resistance (R_th(j-sp))	330 K/W - quantifies junction-to-solder-point heat transfer efficiency for thermal design margining
Forward Voltage (V_F)	≤0.9 V at I_F = 10 mA - confirms low-loss forward conduction for bidirectional clamp configurations

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; 1.3 mm height, 2.9 mm length, 1.3 mm width; optimized for automated placement and reflow soldering on FR4 PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential node in reverse-biased Zener operation; carries forward current when used as ESD clamp
2	Not Connected (n.c.)	Internally unconnected; must remain floating - no PCB trace or pad connection permitted
3	Cathode (K)	Connected to regulated voltage rail; serves as primary heat path to PCB copper via solder point

Key Features

Feature	Design Value
±2 % Zener voltage tolerance	Enables tighter regulation than ±5 % variants (BZX84-C15), reducing need for post-regulation trimming in analog signal chains
250 mW power rating	Supports continuous operation in low-current bias networks (e.g., op-amp reference dividers) without external heatsinking
75 Ω differential resistance	Minimizes output impedance variation across 1–10 mA operating range, improving load regulation in feedback loops
330 K/W junction-to-solder-point R_th	Allows accurate thermal modeling for reliability prediction in sealed enclosures or high-ambient industrial environments
Non-repetitive 2.0 A surge capability	Provides single-event immunity against ESD (IEC 61000-4-2 Level 4) and inductive kickback in relay drivers

Applications

Industrial Sensor Signal Conditioning

Microcontroller I/O Protection

Use Scenario: Biasing a 4–20 mA current-loop transmitter's op-amp reference input in factory automation systems.

IC Role / Device Role / Timing Role: Zener shunt regulator providing stable 15 V reference for DAC output scaling and current-source compliance.

Use Value: ±2 % tolerance ensures <±0.3 V reference error, meeting IEC 61000-6-2 immunity requirements for analog sensor interfaces.

Use Scenario: Clamping GPIO pins of an ARM Cortex-M4 MCU exposed to 12 V automotive CAN bus transceivers.

IC Role / Device Role / Timing Role: Bidirectional ESD suppressor and overvoltage limiter using forward conduction (anode-to-rail) and reverse Zener action (cathode-to-rail).

Use Value: 0.9 V forward drop and 15 V reverse clamp prevent latch-up while surviving 8 kV contact discharge per IEC 61000-4-2.

Low-Power SMPS Feedback Network

Portable Device Battery Monitoring

Use Scenario: Setting the upper threshold in a flyback converter's optocoupler feedback divider for 5 V output regulation.

IC Role / Device Role / Timing Role: Precision voltage reference element defining error amplifier trip point in isolated secondary-side control loop.

Use Value: 75 Ω r_dif maintains <±1.5 % output voltage deviation across 10–100 mA load steps, critical for USB PD compliance.

Use Scenario: Scaling lithium-ion battery voltage (3.0–4.2 V) to 0–3.3 V ADC input range in Bluetooth earbuds.

IC Role / Device Role / Timing Role: Passive voltage divider stabilizer ensuring consistent ratio despite supply ripple and temperature drift.

Use Value: +9.2 mV/K temperature coefficient matches typical resistor TC, minimizing net drift in battery state-of-charge estimation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBZ5245BS-7-F	15 V ±5 % tolerance; 225 mW P_tot; 30 Ω r_dif; SOT23 package	Higher differential conductance improves load regulation but looser tolerance increases reference uncertainty	Select when tighter dynamic regulation outweighs absolute voltage accuracy needs
Vishay BZX84-C15-TP	15 V ±5 % tolerance; 300 mW P_tot; 30 Ω r_dif; same SOT23 footprint	Higher power rating allows higher bias currents but wider tolerance reduces precision in feedback paths	Choose for cost-sensitive designs where ±5 % is acceptable and 300 mW headroom eases thermal design

Compared with MMBZ5245BS-7-F and BZX84-C15-TP, BZX84-B15,235 delivers superior voltage accuracy (±2 % vs. ±5 %) at the expense of slightly higher dynamic impedance - making it optimal for closed-loop feedback and precision biasing where reference stability dominates over raw power handling.

Availability

BZX84-B15,235 is available at Aetrix Electronics and suitable for industrial sensor conditioning, microcontroller I/O protection, and low-power SMPS feedback networks requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZX84-B15,235 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 focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified and industrial-grade components.

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

FAQ

What is the maximum continuous reverse current for reliable operation?

The BZX84-B15,235 supports up to 5 mA DC reverse current for stable Zener operation, corresponding to its 15 V rating and 250 mW power limit. Exceeding this value risks thermal runaway unless board-level copper area and ambient conditions are explicitly derated per the 500 K/W junction-to-ambient thermal resistance specification.

Can Pin 2 be grounded or left floating in PCB layout?

Pin 2 is internally not connected and must remain electrically floating - no trace, pad, or ground connection is permitted. Grounding Pin 2 violates the device's internal construction and may cause unpredictable leakage or premature failure during thermal cycling or humidity exposure.

How does the +9.2 mV/K temperature coefficient affect long-term reference stability?

The +9.2 mV/K coefficient means the Zener voltage increases by 9.2 mV per Kelvin rise in junction temperature at 5 mA. Over a 100 °C ambient range (−40 °C to +60 °C), this contributes up to ±0.92 V drift - mitigated in practice by pairing with negative-TC resistors or using in low-self-heating configurations (<1 mA bias).

Is this device qualified for automotive applications?

No. The BZX84-B15,235 is not automotive-qualified per AEC-Q101. Nexperia explicitly states in Revision 7 that this series is non-automotive; automotive alternatives (e.g., BZX84-Q series) require separate qualification and are listed on nexperia.com - use only industrial-grade variants in non-safety-critical commercial or industrial systems.

BZX84-B15,235 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):: 15 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 30 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 10.5 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-B15,235 FAQ

1.How can I place an order for BZX84-B15,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-B15,235 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-B15,235 reliable?

The price and inventory of BZX84-B15,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-B15,235 is usually 5 days.

3.What payment methods are accepted for BZX84-B15,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B15,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-B15,235?

BZX84-B15,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-B15,235 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-B15,235?

For technical support, including BZX84-B15,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-B15,235 requirements.

6.How does Aetrix verify that BZX84-B15,235 is sourced from the original manufacturer or authorized distributors?

All BZX84-B15,235 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-B15,235 meets industry standards.

7.What is the process for return or replacement of BZX84-B15,235?

All BZX84-B15,235 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B15,235, 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-B15,235 part is unused and in its original packaging.

Return procedure for BZX84-B15,235:

1.Submit a request within 90 days.

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

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