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

Nexperia USA Inc. BZX84-C68,235

Name: BZX84-C68,235
Brand: Nexperia USA Inc.
SKU: BZX84-C68,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-C68,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-C68,235.pdf

Description:: DIODE ZENER 68V 250MW TO236AB

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Product details

Overview

BZX84-C68,235 from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 68 V nominal breakdown voltage at I_Z = 2 mA, with 250 mW total power dissipation and 475 Ω maximum differential resistance. It serves as a precision reference or overvoltage clamp in low-power analog supply rails and sensor bias networks.

For engineers reviewing the BZX84-C68,235 datasheet, BZX84-C68,235 pinout, BZX84-C68,235 application, or BZX84-C68,235 equivalent, key selection criteria include its 68 V Zener voltage tolerance band (64.0–72.0 V), non-repetitive peak reverse power capability of 40 W, thermal resistance of 500 K/W (junction-to-ambient), and cathode-anode polarity confirmation for PCB layout verification.

Technical Context

This device operates in reverse-bias breakdown mode to maintain stable voltage across load variations, with temperature coefficient of +0.05 mV/K at I_Z = 2 mA - indicating minimal drift over ambient range (−55 °C to +150 °C). Its 475 Ω differential resistance defines regulation stiffness under dynamic current changes.

The SOT23 package enables high-density placement on FR4 PCBs with single-sided 70 µm copper; thermal performance is governed by R_th(j-a) = 500 K/W and R_th(j-sp) = 330 K/W, requiring attention to solder point thermal path for surge handling.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	64.0 V to 72.0 V at I_Z = 2 mA - defines usable regulation window under production tolerance
Differential Resistance r_dif	475 Ω max - determines output impedance and load regulation error
Total Power Dissipation P_tot	250 mW at T_amb ≤ 25 °C - sets continuous DC power limit on standard FR4 PCB
Non-repetitive Peak Reverse Power	40 W for t_p = 100 μs - supports transient overvoltage clamping without failure
Reverse Current I_R	240 μA max at V_R = 52 V - quantifies leakage-induced error in high-impedance bias networks
Forward Voltage V_F	0.9 V max at I_F = 10 mA - relevant for polarity-check circuits and series protection configurations
Junction Temperature Range	−55 °C to +150 °C - confirms operation in industrial and extended-temperature environments

Pinout & Package

Package: SOT23 (TO-236AB), surface-mount plastic package with 3 leads; 1.9 mm × 1.1 mm footprint, 1.2 mm height, gull-wing lead form.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential node; forward bias direction for verification and ESD-safe handling
2	Not Connected (n.c.)	Internal die pad with no electrical connection - must remain unconnected on PCB
3	Cathode (K)	Connected to regulated output node; polarity marker for correct orientation during assembly

Key Features

Feature	Design Value
±5 % Zener voltage tolerance	Enables cost-effective voltage reference where tight regulation is not required, e.g., supply rail supervision thresholds
250 mW power rating	Supports continuous regulation in low-current applications (< 3.7 mA at 68 V) without heatsinking
40 W non-repetitive surge capability	Clamps ESD or inductive kick events up to 100 μs duration without degradation
SOT23 package compatibility	Facilitates automated pick-and-place assembly and reflow soldering per IPC-7095 guidelines
150 °C maximum junction temperature	Permits operation in sealed enclosures or near heat-generating components without derating

Applications

Power Supply Reference

Sensor Bias Network

Use Scenario: Stabilizing 68 V reference for ADC input scaling in industrial power monitoring modules.

IC Role / Device Role / Timing Role: Zener diode providing fixed voltage reference against which sensed line voltage is compared.

Use Value: Maintains <±1.5 % reference accuracy over −40 °C to +85 °C ambient, enabling consistent measurement calibration.

Use Scenario: Biasing photodiode anode in optical smoke detector front-end circuitry.

IC Role / Device Role / Timing Role: Voltage clamp limiting reverse bias across photodiode to prevent dark current saturation.

Use Value: Limits photodiode bias to 68 V ±5 %, ensuring linear response while suppressing avalanche noise above 72 V.

Overvoltage Protection

Logic-Level Translation

Use Scenario: Protecting microcontroller GPIO pins from 75 V transients induced by relay coil flyback.

IC Role / Device Role / Timing Role: Shunt clamp absorbing energy during inductive turn-off spikes.

Use Value: Clamps transient to ≤72 V within 100 μs, preventing latch-up in 3.3 V I/O structures rated for 6 V absolute max.

Use Scenario: Level-shifting 3.3 V logic signals to interface with 68 V analog subsystems in HVAC control panels.

IC Role / Device Role / Timing Role: Passive voltage translator using Zener drop between supply rails.

Use Value: Provides stable 64.7 V offset (68 V − 3.3 V) with <100 mV ripple under 100 µA load, eliminating need for active level shifter IC.

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 MMBZ5263BLT1G	68 V nominal, ±5 %, 225 mW P_tot, 500 Ω r_dif, SOT23 package	Lower power rating reduces surge margin; higher r_dif increases regulation error under load variation	Select when legacy ON Semi BOM alignment is required and peak power demands stay below 200 mW
Vishay BZX84-C68-E3-08	68 V nominal, ±5 %, 250 mW P_tot, 475 Ω r_dif, identical SOT23 footprint and marking	No functional difference; Vishay version uses different wafer fab and test flow but meets same JEDEC specs	Drop-in replacement with full mechanical and electrical interchangeability; preferred for dual-sourcing resilience

Compared with BZX84-C68,235, MMBZ5263BLT1G trades 25 mW power headroom and 25 Ω lower differential resistance for broader distributor availability, while BZX84-C68-E3-08 delivers identical performance with alternate supply chain traceability - making it ideal for long-lifecycle industrial programs requiring second-source assurance.

Availability

BZX84-C68,235 is available at Aetrix Electronics and suitable for industrial power monitoring, optical sensor biasing, overvoltage protection, and logic-level translation requiring stable component supply and guaranteed long-term sourcing.

Supply support for BZX84-C68,235 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 diode product line, engineered for cost-sensitive, space-constrained applications demanding stable voltage references and robust transient suppression in consumer, industrial, and computing systems.

FAQ

What is the maximum reverse voltage this diode can withstand before breakdown?

The BZX84-C68,235 has a nominal Zener voltage of 68 V with a ±5 % tolerance, meaning breakdown occurs between 64.0 V and 72.0 V at I_Z = 2 mA. Below 64.0 V, reverse leakage remains ≤240 μA at 52 V; sustained operation above 72.0 V risks irreversible thermal runaway.

Can this Zener diode be used in series to achieve higher regulation voltage?

Yes, multiple BZX84-C68,235 diodes may be connected in series to increase total Zener voltage, but mismatched tolerances (±5 % each) cause cumulative uncertainty - two units yield 136 V ±7.1 V. Thermal coupling must be ensured to avoid current hogging due to differing temperature coefficients.

Is the n.c. pin electrically isolated or internally tied to substrate?

Pin 2 is explicitly designated "not connected" in Nexperia's official pinning diagram and internal construction; it is electrically isolated from all die elements and must not be soldered or routed on PCB. No internal tie to substrate, cathode, or anode exists.

How does ambient temperature affect its Zener voltage stability?

At I_Z = 2 mA, the temperature coefficient is +0.05 mV/K - meaning V_Z increases by ~3.4 mV per 68 K rise. Over −55 °C to +150 °C, total drift is approximately ±10.2 mV, or ±0.015 % of 68 V, confirming suitability for non-critical reference applications.

BZX84-C68,235 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):: 68 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 240 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 47.6 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-C68,235 FAQ

1.How can I place an order for BZX84-C68,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-C68,235 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-C68,235 reliable?

The price and inventory of BZX84-C68,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C68,235 is usually 5 days.

3.What payment methods are accepted for BZX84-C68,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C68,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-C68,235?

BZX84-C68,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-C68,235 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-C68,235?

For technical support, including BZX84-C68,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C68,235 requirements.

6.How does Aetrix verify that BZX84-C68,235 is sourced from the original manufacturer or authorized distributors?

All BZX84-C68,235 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-C68,235 meets industry standards.

7.What is the process for return or replacement of BZX84-C68,235?

All BZX84-C68,235 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C68,235, 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-C68,235 part is unused and in its original packaging.

Return procedure for BZX84-C68,235:

1.Submit a request within 90 days.

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

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