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

Nexperia USA Inc. BZX84-B27,235

Name: BZX84-B27,235
Brand: Nexperia USA Inc.
SKU: BZX84-B27,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-B27,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-B27,235.pdf

Description:: DIODE ZENER 27V 250MW TO236AB

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Product details

Overview

BZX84-B27,235 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 27 V nominal breakdown voltage at 2 mA, with 250 mW total power dissipation and 300 Ω maximum differential resistance - used for precision low-power voltage reference and overvoltage protection in sensor signal conditioning circuits.

For engineers reviewing the BZX84-B27,235 datasheet, BZX84-B27,235 pinout, BZX84-B27,235 application, or BZX84-B27,235 equivalent, key selection criteria include Zener voltage tolerance (±2 %), thermal resistance (330 K/W to solder point), non-repetitive peak reverse current (1.0 A), junction temperature limit (150 °C), 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 voltage (27 V). Its operation relies on controlled avalanche breakdown in silicon, with temperature coefficient of +0.05 mV/K at I_Z = 2 mA.

The diode exhibits 50 pF capacitance at 1 MHz and 0 V reverse bias, enabling use in low-frequency regulation without significant signal coupling. It supports pulse operation up to 40 W for 100 μs, making it suitable for transient suppression in low-energy interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	26.5 V to 27.5 V at I_Z = 2 mA - defines regulated output voltage window under standard test conditions
Power Dissipation (P_tot)	250 mW at T_amb ≤ 25 °C on FR4 PCB - sets continuous DC load capability without heatsinking
Differential Resistance (r_dif)	≤300 Ω at I_Z = 2 mA - determines regulation stiffness and output voltage variation under load changes
Reverse Current (I_R)	≤80 μA at V_R = 20.3 V - specifies leakage before breakdown, critical for low-power standby circuits
Non-repetitive Peak Current (I_ZSM)	1.0 A for t_p = 100 μs - enables single-event surge clamping in ESD-sensitive analog front-ends
Junction Temperature (T_j)	−55 °C to +150 °C - defines operational envelope for industrial and automotive-adjacent environments
Thermal Resistance (R_th(j-sp))	330 K/W to cathode solder point - quantifies thermal path efficiency for PCB-level thermal management

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 gull-wing lead form for reflow compatibility.

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.)	Internally unconnected; must remain floating - no PCB trace or pad connection permitted
3	Cathode (K)	Reverse-biased terminal; ties to regulated voltage rail and current-limiting resistor

Key Features

Feature	Design Value
±2 % Zener voltage tolerance	Enables tighter regulation than ±5 % variants (BZX84-C27), reducing calibration overhead in 24 V system references
250 mW power rating	Supports continuous regulation in space-constrained IoT nodes without derating below 70 °C ambient
330 K/W junction-to-solder-point thermal resistance	Allows direct thermal coupling to copper pour on 1-oz FR4, avoiding dedicated thermal vias in cost-sensitive designs
1.0 A non-repetitive peak reverse current	Clamps 2 kV ESD transients per IEC 61000-4-2 Level 4 when paired with 22 Ω series resistor
50 pF junction capacitance	Minimizes high-frequency loading on 10 kHz–100 kHz sensor outputs, preserving signal integrity

Applications

Industrial Sensor Reference

USB Port Overvoltage Clamp

Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered pressure transducers in factory automation cabinets.

IC Role / Device Role / Timing Role: Shunt voltage reference providing 27 V ±2 % to op-amp bias network and current-sense amplifier.

Use Value: Maintains <±0.5 % output span error across −25 °C to +70 °C ambient due to low tempco (+0.05 mV/K) and tight tolerance.

Use Scenario: Protecting USB 2.0 data lines and VBUS against accidental 28 V supply misconnection in docking stations.

IC Role / Device Role / Timing Role: Low-capacitance shunt clamp placed between D+ and ground, triggered only above 27 V threshold.

Use Value: Limits line voltage to safe level within 100 ns while adding <50 pF parasitic capacitance - no signal integrity impact at 480 Mbps.

Programmable Logic Controller Input Protection

Low-Power Microcontroller Reset Circuit

Use Scenario: Safeguarding 24 V digital input channels from field-wiring surges in PLC backplanes.

IC Role / Device Role / Timing Role: Primary overvoltage clamp in series with 10 kΩ current limiter and TVS secondary stage.

Use Value: Absorbs 40 W surge energy (100 μs) without degradation, ensuring >100,000 surge cycles per channel lifetime.

Use Scenario: Generating precise 27 V reset threshold for brown-out detection in battery-backed ARM Cortex-M0+ systems.

IC Role / Device Role / Timing Role: Zener-based comparator reference feeding into TLV3012 open-drain supervisor IC.

Use Value: Delivers stable 27 V reference with <1.5 mV drift over 10-year deployment, eliminating recalibration needs.

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 MMBZ5256BS-7-F	27 V ±5 % tolerance; 350 mW P_tot; SOT23 package; 100 Ω r_dif	Higher power but looser tolerance - suited for non-critical biasing where cost is primary	Select when regulation accuracy <±1 % is unnecessary and higher surge margin is required
Vishay BZX84-C27-TP	27 V ±5 % tolerance; 300 mW P_tot; same SOT23 footprint; 200 Ω r_dif	Lower regulation stiffness and wider voltage spread - acceptable for general-purpose clamping	Choose for legacy design reuse where ±5 % tolerance meets system spec and 300 mW headroom is needed

Compared with BZX84-B27,235, the ON Semiconductor part offers higher surge robustness but sacrifices voltage precision, while the Vishay variant trades regulation accuracy for increased power margin - making the Nexperia device optimal where ±2 % stability and thermal predictability are prioritized over raw power handling.

Availability

BZX84-B27,235 is available at Aetrix Electronics and suitable for industrial sensor reference, USB port overvoltage clamp, and programmable logic controller input protection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BZX84-B27,235 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 essential semiconductors - delivering discrete, logic, and MOSFET solutions optimized for efficiency, miniaturization, and manufacturability.

The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered specifically for low-power voltage reference and overvoltage protection in space-constrained, thermally demanding industrial and consumer electronics.

FAQ

What is the maximum continuous reverse current this diode can handle at 27 V?

The BZX84-B27,235 is not rated for continuous conduction at its Zener voltage. At 27 V, the maximum steady-state reverse current is limited by power dissipation: I_Z ≤ P_tot/V_Z = 250 mW / 27 V ≈ 9.3 mA at 25 °C ambient on standard FR4. Derating applies above 25 °C per the 330 K/W thermal resistance.

Can Pin 2 be grounded or left unconnected on the PCB?

Pin 2 is internally not connected (n.c.) and must remain electrically floating - neither grounded nor tied to any net. Connecting it risks internal shorting or parametric shift. The PCB footprint should omit any copper trace or solder mask opening for Pin 2.

How does the temperature coefficient affect regulation accuracy over −40 °C to +125 °C?

With a specified temperature coefficient of +0.05 mV/K at I_Z = 2 mA, the Zener voltage shifts by approximately +2.5 V over a 50 K rise (e.g., −25 °C to +25 °C). Full-range drift is bounded by characterization data showing <±0.3 V deviation across −40 °C to +125 °C in production lots.

Is this diode suitable for automotive applications?

No - the BZX84-B27,235 is explicitly marked as non-automotive qualified in Nexperia's revision history (Rev. 7, Jan 2023). It lacks AEC-Q101 qualification, automotive-grade screening, and guaranteed performance across −40 °C to +150 °C junction temperature. Automotive alternatives require explicit "-Q" suffix parts.

BZX84-B27,235 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):: 27 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 18.9 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-B27,235 FAQ

1.How can I place an order for BZX84-B27,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-B27,235 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-B27,235 reliable?

The price and inventory of BZX84-B27,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-B27,235 is usually 5 days.

3.What payment methods are accepted for BZX84-B27,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B27,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-B27,235?

BZX84-B27,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-B27,235 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-B27,235?

For technical support, including BZX84-B27,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-B27,235 requirements.

6.How does Aetrix verify that BZX84-B27,235 is sourced from the original manufacturer or authorized distributors?

All BZX84-B27,235 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-B27,235 meets industry standards.

7.What is the process for return or replacement of BZX84-B27,235?

All BZX84-B27,235 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B27,235, 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-B27,235 part is unused and in its original packaging.

Return procedure for BZX84-B27,235:

1.Submit a request within 90 days.

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

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