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

Nexperia USA Inc. BZX84-C39,215

Name: BZX84-C39,215
Brand: Nexperia USA Inc.
SKU: BZX84-C39,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-C39,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-C39,215.pdf

Description:: DIODE ZENER 39V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:2,736

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Product details

Overview

BZX84-C39,215 from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 39 V nominal breakdown voltage at 2 mA test current, 350 Ω maximum differential resistance, and 130 μA reverse current at 37 V, used for precision low-power voltage reference and overvoltage protection in power supply feedback paths.

For engineers reviewing the BZX84-C39,215 datasheet, BZX84-C39,215 pinout, BZX84-C39,215 application, or BZX84-C39,215 equivalent, key selection criteria include Zener voltage tolerance (±5 %), thermal resistance (330 K/W junction-to-solder point), non-repetitive peak reverse current (0.7 A), forward voltage (≤0.9 V at 10 mA), and SOT23 footprint compatibility with automated PCB assembly.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage by conducting reverse current above its specified Zener breakdown threshold. Its regulation behavior is defined by differential resistance (350 Ω max at I_Z = 2 mA) and temperature coefficient (+0.05 mV/K), enabling predictable drift compensation in bias networks.

Designed for surface-mount use on FR4 PCBs with single-sided 70 µm copper, it relies on thermal conduction through the cathode terminal (R_th(j-sp) = 330 K/W) rather than ambient convection (R_th(j-a) = 500 K/W), making solder joint integrity critical to sustained 250 mW power dissipation capability.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	37.0 V to 41.0 V at I_Z = 2 mA - defines regulated output range under nominal bias
Differential Resistance r_dif	350 Ω max at I_Z = 2 mA - determines load regulation error under varying current
Reverse Current I_R	130 μA max at V_R = 37 V - sets minimum leakage in pre-breakdown state
Forward Voltage V_F	≤0.9 V at I_F = 10 mA - limits conduction loss when used in series polarity
Total Power Dissipation P_tot	250 mW at T_amb ≤ 25 °C - constrains continuous DC power handling on standard PCB
Non-repetitive Peak Reverse Current I_ZSM	0.7 A at t_p = 100 μs - supports transient overvoltage clamping without failure
Junction Temperature T_j	−55 °C to +150 °C - enables operation across industrial temperature ranges

Pinout & Package

Package: SOT23 (TO-236AB), 3-lead surface-mount plastic package with 1.9 mm × 1.1 mm body, 0.95 mm height, and gull-wing leads spaced 0.95 mm apart.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential node in shunt regulation; carries forward current during conduction
2	Not Connected (n.c.)	Internally unconnected; must remain floating-no PCB trace or pad required
3	Cathode (K)	Connected to regulated voltage node; primary thermal path to PCB via solder joint

Key Features

Feature	Design Value
±5 % Zener voltage tolerance	Enables cost-effective voltage referencing where tight regulation is not required, e.g., supply rail monitoring
250 mW total power dissipation	Supports continuous regulation in space-constrained consumer and industrial PCBs without heatsinking
330 K/W junction-to-solder-point thermal resistance	Allows reliable power handling when cathode pad is properly sized per IPC-7351B Class B footprint
0.7 A non-repetitive peak reverse current	Provides robust ESD and surge immunity up to 40 W for <100 μs transients in input protection circuits
SOT23 package compatibility	Ensures drop-in replacement in existing designs using JEDEC-standard pick-and-place equipment and reflow profiles

Applications

Power Supply Feedback Reference

Overvoltage Clamp Protection

Use Scenario: Stabilizing output voltage of isolated flyback or buck-boost converters via optocoupler feedback loop.

IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 39 V threshold to TL431 or similar error amplifier.

Use Value: Maintains ±5 % output regulation accuracy across line/load variations without external trimming components.

Use Scenario: Protecting microcontroller I/O pins or ADC inputs from transient surges exceeding 39 V.

IC Role / Device Role / Timing Role: Fast-acting clamp diverting excess energy to ground before damage occurs.

Use Value: Limits voltage excursion to ≤41 V during 100 μs surges, preventing latch-up in 3.3 V/5 V logic interfaces.

Low-Power Bias Network

Reference Voltage Generator

Use Scenario: Generating stable bias points for op-amp input stages or transistor base drive in sensor signal conditioning.

IC Role / Device Role / Timing Role: Passive voltage source establishing fixed DC offset independent of supply ripple.

Use Value: Delivers <130 μA leakage at 37 V, minimizing quiescent current impact in battery-powered instrumentation.

Use Scenario: Providing accurate 39 V reference for analog-to-digital conversion scaling or comparator hysteresis thresholds.

IC Role / Device Role / Timing Role: Precision voltage node referenced against system ground for measurement calibration.

Use Value: Enables 0.05 mV/K temperature coefficient compensation in multi-decade temperature environments.

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 MMBZ5267BLT1G	39 V nominal, ±5 % tolerance, 350 Ω r_dif, but rated for 225 mW P_tot and 0.5 A I_ZSM	Limited surge handling in high-energy transient environments	Select when lower-cost sourcing is prioritized and peak power demands stay below 225 mW
Vishay BZX84-C39-TP	Identical 39 V / ±5 % / 350 Ω spec, but qualified to AEC-Q200 Grade 3 for extended temperature reliability	Required for automotive-grade designs needing −40 °C to +125 °C operation	Select when automotive qualification and enhanced long-term stability under thermal cycling are mandatory

Compared with MMBZ5267BLT1G, BZX84-C39,215 delivers 11 % higher continuous power (250 mW vs. 225 mW) and 40 % greater surge current (0.7 A vs. 0.5 A); versus BZX84-C39-TP, it lacks automotive qualification but offers identical electrical performance at lower cost for industrial and consumer use.

Availability

BZX84-C39,215 is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp protection, and low-power bias network applications requiring stable component supply and SOT23 footprint consistency.

Supply support for BZX84-C39,215 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 focused on high-volume, high-reliability discrete and logic devices, headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.

The BZX84 series belongs to Nexperia's voltage regulator diode product line, engineered specifically for cost-sensitive, space-constrained applications demanding stable Zener reference performance in SMT production environments.

FAQ

What is the maximum continuous reverse power this diode can handle?

The BZX84-C39,215 has a total power dissipation limit of 250 mW at ambient temperatures ≤25 °C when mounted on an FR4 PCB with single-sided 70 µm copper. Derating is required above 25 °C at 2.0 mW/°C, reaching zero dissipation at 150 °C junction temperature.

How does the "215" suffix in the part number relate to marking or packaging?

The "215" suffix identifies the specific tape-and-reel packaging variant per Nexperia's ordering system: it denotes 3,000 units per reel in 8 mm carrier tape, compatible with standard SMT feeders, and corresponds to the marking code "%T8" laser-etched on the device body per Table 4 of the datasheet.

Can this Zener diode be used in series with another for higher voltage reference?

Yes, BZX84-C39,215 may be cascaded in series to achieve higher reference voltages, but differential resistance (350 Ω) and temperature coefficients (+0.05 mV/K) accumulate linearly; mismatched units will increase overall tolerance beyond ±5 %, requiring individual characterization for precision applications.

Is Pin 2 truly unused, and what happens if it is accidentally soldered?

Pin 2 is internally not connected (n.c.) and must remain electrically floating; accidental soldering to ground or signal traces introduces no functional benefit and risks mechanical stress-induced package cracking during thermal cycling or board flexure due to constrained lead movement.

BZX84-C39,215 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):: 39 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 130 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 27.3 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-C39,215 FAQ

1.How can I place an order for BZX84-C39,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-C39,215 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-C39,215 reliable?

The price and inventory of BZX84-C39,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C39,215 is usually 5 days.

3.What payment methods are accepted for BZX84-C39,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C39,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-C39,215?

BZX84-C39,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-C39,215 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-C39,215?

For technical support, including BZX84-C39,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C39,215 requirements.

6.How does Aetrix verify that BZX84-C39,215 is sourced from the original manufacturer or authorized distributors?

All BZX84-C39,215 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-C39,215 meets industry standards.

7.What is the process for return or replacement of BZX84-C39,215?

All BZX84-C39,215 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C39,215, 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-C39,215 part is unused and in its original packaging.

Return procedure for BZX84-C39,215:

1.Submit a request within 90 days.

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

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