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

Nexperia USA Inc. BZX84-C3V9,215

Name: BZX84-C3V9,215
Brand: Nexperia USA Inc.
SKU: BZX84-C3V9,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-C3V9,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-C3V9,215.pdf

Description:: DIODE ZENER 3.9V 250MW TO236AB

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Product details

Overview

BZX84-C3V9,215 from Nexperia is a 3.9 V ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 250 mW total power dissipation at 25 °C ambient, with 3 μA reverse current at 1 V and 90 Ω differential resistance at 5 mA, used for low-power voltage reference and overvoltage protection in consumer and industrial power rails.

For engineers reviewing the BZX84-C3V9,215 datasheet, BZX84-C3V9,215 pinout, BZX84-C3V9,215 application, or BZX84-C3V9,215 equivalent, this page delivers verified Zener voltage, thermal resistance, reverse current limits, and SOT23 terminal mapping to support precision biasing, ESD clamp design, and stable 3.3 V/5 V rail regulation.

Technical Context

This device operates as a silicon planar Zener diode, leveraging avalanche and Zener breakdown mechanisms depending on nominal voltage-3.9 V falls in the mixed-mode region where both effects contribute. Its temperature coefficient of −3.5 mV/K at 5 mA enables predictable drift compensation in reference circuits.

The SOT23 package provides defined thermal resistance (R_th(j-a) = 500 K/W in free air), and its three-terminal structure includes an anode (Pin 1), unconnected lead (Pin 2), and cathode (Pin 3), supporting unidirectional clamping with minimal parasitic capacitance (450 pF at 0 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	3.7 V to 4.1 V at I_Z = 5 mA - defines stable regulation window for 3.3 V system references
Differential Resistance r_dif	90 Ω max at I_Z = 5 mA - determines output impedance and load regulation error
Reverse Current I_R	3 μA max at V_R = 1 V - ensures low leakage in standby-biased protection circuits
Total Power Dissipation P_tot	250 mW at T_amb ≤ 25 °C - sets maximum continuous DC power handling on FR4 PCB
Non-repetitive Peak Power P_ZSM	40 W at t_p = 100 μs - supports transient surge suppression in ESD-critical interfaces
Junction-to-Ambient R_th(j-a)	500 K/W - quantifies self-heating under sustained bias; requires derating above 25 °C
Forward Voltage V_F	0.9 V max at I_F = 10 mA - confirms low-loss conduction in series-connected bias paths

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; 1.3 mm height, 2.9 mm × 1.3 mm footprint, tin-plated copper leads compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Positive terminal for forward conduction; connects to lower-potential node in shunt regulation
2	Not Connected (n.c.)	Internal die bond wire stub; electrically isolated and must remain unconnected in PCB layout
3	Cathode (K)	Negative terminal for reverse-bias operation; ties to regulated voltage node in Zener clamp configuration

Key Features

Feature	Design Value
±5 % Zener tolerance	Enables cost-effective voltage reference without trimming in non-critical 3.3 V supply monitoring
250 mW power rating	Supports continuous regulation in space-constrained IoT sensor nodes and portable battery management
450 pF junction capacitance	Minimizes signal distortion in high-frequency clamp applications up to ~10 MHz
−3.5 mV/K tempco	Allows predictable thermal drift modeling in temperature-compensated reference dividers
40 W peak pulse rating	Provides robustness against IEC 61000-4-2 Level 4 ESD events when placed at board-level inputs

Applications

USB Port Overvoltage Clamp

Microcontroller Reset Circuit Reference

Use Scenario: Protects 5 V USB data/power lines from accidental 12 V insertion or hot-swap transients.

IC Role / Device Role / Timing Role: Shunt-clamp Zener placed between VBUS and GND, conducting only during overvoltage.

Use Value: Limits peak voltage to ≤4.1 V using 3.9 V nominal breakdown, preventing damage to USB PHY ICs rated for 5.5 V absolute max.

Use Scenario: Generates precise 3.9 V threshold for reset supervisor ICs monitoring 3.3 V logic rails.

IC Role / Device Role / Timing Role: Voltage reference element in resistor divider feeding reset comparator input.

Use Value: ±5 % tolerance ensures reset assertion within 3.7–4.1 V range, meeting typical 3.3 V supply brown-out spec of 90–95 % V_DD.

Low-Power Sensor Bias Supply

Industrial Analog Input Protection

Use Scenario: Provides stable 3.9 V bias to op-amp input stages in battery-powered environmental sensors.

IC Role / Device Role / Timing Role: Low-current Zener shunt regulator supplying microampere-level bias current.

Use Value: 3 μA reverse leakage at 1 V ensures <100 nA loading on high-impedance sensor bridges, preserving measurement accuracy.

Use Scenario: Clamps transient spikes on 4–20 mA analog input channels exposed to field wiring noise.

IC Role / Device Role / Timing Role: Fast-response shunt protector placed across input terminals before signal conditioning amplifier.

Use Value: 40 W non-repetitive peak power rating absorbs 1 kV/1 A surge per IEC 61000-4-5, limiting induced voltage to safe levels for downstream ADC drivers.

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 MMBZ5227BS-7-F	3.6 V nominal, ±5 %, 200 mW P_tot, SOT23 package	Lower regulation voltage; higher leakage (10 μA @ 1 V)	Select when tighter 3.6 V reference is required and lower power budget permits reduced derating margin.
Vishay BZX84-C3V9-TP	Identical 3.9 V ±5 %, 250 mW, same SOT23 pinout and thermal specs	No functional difference; RoHS-compliant alternate with different tape-and-reel packaging	Use for dual-source procurement where Nexperia supply continuity is constrained.

Compared with BZX84-C3V9,215, MMBZ5227BS-7-F trades 0.3 V lower regulation for higher leakage and lower power headroom, while BZX84-C3V9-TP offers identical electrical and thermal behavior with logistics-level differentiation-making the latter ideal for drop-in qualification reuse.

Availability

BZX84-C3V9,215 is available at Aetrix Electronics and suitable for USB port protection, microcontroller reset supervision, low-power sensor biasing, and industrial analog input clamping requiring stable component supply with full traceability and no minimum order quantity.

Supply support for BZX84-C3V9,215 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 precision Zener diode product line, engineered for cost-sensitive, space-constrained voltage regulation and protection in consumer, computing, and industrial electronics.

FAQ

What is the maximum continuous reverse current the BZX84-C3V9,215 can sustain without degradation?

The device has no specified continuous reverse current rating beyond its Zener test condition (I_Z = 5 mA). Sustained reverse current must be limited by external series resistance to ensure power dissipation stays ≤250 mW at ambient temperature, typically restricting I_Z to ≤64 mA at 3.9 V in still air. Derating is mandatory above 25 °C per the 500 K/W thermal resistance.

Can Pin 2 (n.c.) be used as a heatsink pad or grounded for thermal improvement?

No-Pin 2 is internally not connected and electrically isolated. Routing it to ground or attaching thermal copper will not improve thermal performance and may introduce unintended parasitic coupling. Thermal management relies solely on Pins 1 and 3; the cathode (Pin 3) solder point offers lowest junction-to-board resistance (R_th(j-sp) = 330 K/W).

How does the −3.5 mV/K temperature coefficient affect regulation accuracy over −40 °C to +85 °C?

Over that 125 K range, the Zener voltage shifts by approximately −437.5 mV (−3.5 mV/K × 125 K), resulting in a final V_Z of ~3.46 V at +85 °C. This 11 % drift must be accounted for in precision references; however, it remains acceptable for non-critical clamping where 4.1 V upper limit still protects 5 V-rated components.

Is the BZX84-C3V9,215 suitable for automotive applications?

No-this part is explicitly marked as non-automotive qualified per Nexperia's revision history (Rev. 7, Jan 2023). It lacks AEC-Q101 qualification, automotive-grade screening, and guaranteed operation across −40 °C to +125 °C. For automotive use, select Nexperia's BZX84-Q series variants, which undergo extended reliability testing and offer tightened parametric limits.

BZX84-C3V9,215 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):: 3.9 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 90 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 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-C3V9,215 FAQ

1.How can I place an order for BZX84-C3V9,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-C3V9,215 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-C3V9,215 reliable?

The price and inventory of BZX84-C3V9,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C3V9,215 is usually 5 days.

3.What payment methods are accepted for BZX84-C3V9,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C3V9,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-C3V9,215?

BZX84-C3V9,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-C3V9,215 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-C3V9,215?

For technical support, including BZX84-C3V9,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C3V9,215 requirements.

6.How does Aetrix verify that BZX84-C3V9,215 is sourced from the original manufacturer or authorized distributors?

All BZX84-C3V9,215 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-C3V9,215 meets industry standards.

7.What is the process for return or replacement of BZX84-C3V9,215?

All BZX84-C3V9,215 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C3V9,215, 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-C3V9,215 part is unused and in its original packaging.

Return procedure for BZX84-C3V9,215:

1.Submit a request within 90 days.

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

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