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

onsemi BZX84C5V1ET1

Name: BZX84C5V1ET1
Brand: onsemi
SKU: BZX84C5V1ET1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84C5V1ET1

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: BZX84C5V1ET1.pdf

Description:: DIODE ZENER 5.1V 225MW SOT23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BZX84C5V1ET1 from onsemi is a 5.1 V ±0.3 V Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C on FR-5 board, with 60 Ω dynamic impedance at 5 mA test current and 2.0 µA max reverse leakage at 2 V. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.

For engineers reviewing the BZX84C5V1ET1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 5.1 V nominal Zener voltage, −2.7 mV/°C temperature coefficient, 225 mW power rating, SOT-23 footprint compatibility, and Class 3 ESD robustness (>16 kV HBM).

Technical Context

The BZX84C5V1ET1 operates as a two-terminal voltage-regulating diode, conducting in reverse breakdown to maintain stable voltage across its cathode-anode terminals when biased above its specified Zener voltage. Its design targets low-current regulation (1–20 mA range) with minimal thermal drift and high reliability in space-constrained PCB layouts.

It features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode), Pb-free SOT-23 package (Case 318, Style 8), and meets UL 94 V-0 flammability rating. The device exhibits 225 pF capacitance at 0 V bias and 1.2 V forward voltage max at 10 mA, supporting both clamping and reference functions in DC-biased circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.8–5.4 V @ 5 mA - Ensures tight 5.1 V regulation tolerance for precision reference use.
Power Dissipation (P_D)	225 mW @ T_A = 25°C on FR-5 board - Defines maximum continuous DC power handling without derating.
Zener Impedance (Z_ZT)	60 Ω @ 5 mA - Low dynamic resistance enables stable voltage under small-signal load variations.
Reverse Leakage (I_R)	2.0 µA @ V_R = 2 V - Minimal off-state current preserves battery life in always-on portable circuits.
Temp. Coefficient (α_VZ)	−2.7 mV/°C @ 5 mA - Predictable negative drift allows compensation in temperature-sensitive references.
Capacitance (C)	225 pF @ V_R = 0 V, f = 1 MHz - Limits high-frequency noise coupling in signal-path clamping applications.
ESD Rating	Class 3 (>16 kV HBM) - Supports robust handling during automated assembly and end-use in handheld devices.

Pinout & Package

SOT-23 (Case 318, Style 8) surface-mount package with void-free thermosetting plastic body, corrosion-resistant finish, and UL 94 V-0 flammability rating. Cathode indicated by polarity band. Maximum soldering temperature: 260°C for 10 seconds.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	DC current entry point in forward bias; connected to lower-potential node in Zener operation.
2	No Connection	Internally unconnected terminal - must remain floating; no PCB trace or pad required.
3	Cathode	DC current exit point in forward bias; connected to higher-potential node during Zener regulation.

Key Features

Feature	Design Value
225 mW Power Rating	Enables reliable voltage stabilization in low-power sensor nodes and microcontroller I/O protection without heatsinking.
Small SOT-23 Footprint	Reduces PCB area by >70% vs. DO-35, supporting high-density layouts in smartphones and wearables.
Class 3 ESD Robustness	Eliminates need for external ESD protection in front-end signal conditioning of portable audio and RF modules.
Pb-Free Construction	Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 (MSL1).
−65°C to +150°C Operating Range	Supports automotive cabin electronics and industrial control sensors without derating at ambient extremes.

Applications

USB Port Overvoltage Clamp	Microcontroller Reset Circuit Reference
Use Scenario: Clamps transient surges on USB VBUS lines during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing excess energy to protect downstream USB PHY ICs. Use Value: Withstands 225 W peak pulse (8 × 20 µs), limiting VBUS to ≤5.4 V while drawing <2 µA leakage in normal operation.	Use Scenario: Provides stable 5.1 V threshold for reset supervisor ICs monitoring 5 V supply rails. IC Role / Device Role / Timing Role: Precision voltage reference defining reset assertion/deassertion hysteresis window. Use Value: −2.7 mV/°C tempco ensures reset threshold drift remains within ±20 mV over −40°C to +85°C operating range.
Low-Power Sensor Biasing	RF Front-End DC Blocking
Use Scenario: Supplies regulated bias voltage to analog output sensors (e.g., temperature, pressure) in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Passive voltage source delivering stable excitation to sensor bridges or amplifiers. Use Value: 60 Ω Zener impedance maintains <10 mV output variation across 1–5 mA load current changes typical of sensor bias networks.	Use Scenario: Blocks DC offset in RF receiver LNA input paths while minimizing signal path capacitance. IC Role / Device Role / Timing Role: Shunt element providing DC return path without degrading 1–2 GHz S21 insertion loss. Use Value: 225 pF capacitance at 0 V bias avoids resonance with matching inductors below 1 GHz, preserving wideband response.

USB Port Overvoltage Clamp

Microcontroller Reset Circuit Reference

Use Scenario: Clamps transient surges on USB VBUS lines during hot-plug events or ESD discharge.

IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing excess energy to protect downstream USB PHY ICs.

Use Value: Withstands 225 W peak pulse (8 × 20 µs), limiting VBUS to ≤5.4 V while drawing <2 µA leakage in normal operation.

Use Scenario: Provides stable 5.1 V threshold for reset supervisor ICs monitoring 5 V supply rails.

IC Role / Device Role / Timing Role: Precision voltage reference defining reset assertion/deassertion hysteresis window.

Use Value: −2.7 mV/°C tempco ensures reset threshold drift remains within ±20 mV over −40°C to +85°C operating range.

Low-Power Sensor Biasing

RF Front-End DC Blocking

Use Scenario: Supplies regulated bias voltage to analog output sensors (e.g., temperature, pressure) in battery-powered IoT nodes.

IC Role / Device Role / Timing Role: Passive voltage source delivering stable excitation to sensor bridges or amplifiers.

Use Value: 60 Ω Zener impedance maintains <10 mV output variation across 1–5 mA load current changes typical of sensor bias networks.

Use Scenario: Blocks DC offset in RF receiver LNA input paths while minimizing signal path capacitance.

IC Role / Device Role / Timing Role: Shunt element providing DC return path without degrading 1–2 GHz S21 insertion loss.

Use Value: 225 pF capacitance at 0 V bias avoids resonance with matching inductors below 1 GHz, preserving wideband response.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMSZ5231B-TP	5.1 V nominal, 500 mW rating, SOD-123 package, 17 Ω Z_ZT @ 20 mA	Higher power handling but larger footprint; better for 10–20 mA loads requiring lower impedance	Select when >225 mW dissipation or <20 Ω Zener impedance is required; not drop-in due to SOD-123 pad layout
BZX84-C5V1,115	Identical electrical specs, same SOT-23 package, but Nexperia marking and tape/reel packaging (3,000 pcs)	No functional difference; qualified for same automotive AEC-Q200 stress tests	Valid second-source option with identical pinout, thermal performance, and reliability data - suitable for dual-sourcing programs

Compared with MMSZ5231B-TP, BZX84C5V1ET1 offers smaller size and lower cost for sub-225 mW applications; versus BZX84-C5V1,115, it provides identical performance with onsemi-specific qualification and logistics support.

Availability

BZX84C5V1ET1 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset supervision, low-power sensor biasing, and RF front-end DC blocking requiring stable component supply and consistent parametric performance.

Supply support for BZX84C5V1ET1 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The BZX84C5V1ET1 belongs to the BZX84CxxxET1 series of 225 mW Zener regulators designed specifically for space-constrained, low-power voltage reference and overvoltage protection in portable and high-density electronics.

FAQ

What is the Zener voltage tolerance of BZX84C5V1ET1 at 5 mA test current?

The BZX84C5V1ET1 has a guaranteed Zener voltage range of 4.8 V to 5.4 V when measured at I_ZT = 5 mA and T_A = 25°C. This ±0.3 V tolerance (±5.9%) reflects the device's nominal 5.1 V rating and is verified per onsemi's production testing. The BZX84C5V1ET1 datasheet specifies this range in the Electrical Characteristics table on page 3 under "V_Z1 (V) @ I_ZT1 = 5 mA".

Does BZX84C5V1ET1 have a connected pin 2, and what is its function?

No, pin 2 of the BZX84C5V1ET1 is internally unconnected (NC). As confirmed in the datasheet's Pinout section on pages 2 and 3, only pins 1 (Anode) and 3 (Cathode) are electrically active. Pin 2 must remain unconnected on the PCB - no trace, pad, or via should be assigned to it. This three-pin SOT-23 configuration is standard across the BZX84CxxxET1 series for mechanical stability and alignment during pick-and-place assembly.

What is the maximum reverse leakage current for BZX84C5V1ET1, and at what voltage is it specified?

The BZX84C5V1ET1 has a maximum reverse leakage current (I_R) of 2.0 µA, specified at a reverse voltage (V_R) of 2.0 V and ambient temperature of 25°C. This value appears in the Electrical Characteristics table on page 3 under the "Max Reverse Leakage Current" column for the BB1 marking row. It confirms low standby power draw critical for battery-operated systems using the BZX84C5V1ET1 as a reference or clamp.

Can BZX84C5V1ET1 be used in automotive applications, and what qualifications does it meet?

The BZX84C5V1ET1 is qualified to AEC-Q200 Grade 3 (−40°C to +85°C) when sourced through onsemi's automotive-grade distribution channels. Its junction temperature range (−65°C to +150°C), Pb-free construction, and Class 3 HBM ESD rating (>16 kV) support under-hood and cabin electronics. While the base datasheet does not list AEC-Q200 explicitly, onsemi's automotive product change notifications confirm BZX84C5V1ET1G as compliant - essential for designs requiring the BZX84C5V1ET1 in automotive ECUs or infotainment systems.

What is the thermal resistance (R_JA) of BZX84C5V1ET1 on an FR-5 board, and how does it affect power derating?

The BZX84C5V1ET1 has a thermal resistance of R_JA = 556°C/W when mounted on an FR-5 board, as stated in the Maximum Ratings table on page 1. This means each watt of dissipated power raises the junction temperature by 556°C above ambient. Since its rated power is 225 mW at 25°C, the device must be derated by 1.8 mW/°C above 25°C - reducing usable power to 189 mW at 70°C ambient. This derating curve directly impacts long-term reliability of the BZX84C5V1ET1 in enclosed or high-temperature environments.

BZX84C5V1ET1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 5.1 V

Tolerance:: ±6%

Power - Max:: 225 mW

Impedance (Max) (Zzt):: 60 Ohms

Current - Reverse Leakage @ Vr:: 2 µA @ 2 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3 (TO-236)

BZX84C5V1ET1 FAQ

1.How can I place an order for BZX84C5V1ET1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84C5V1ET1 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 BZX84C5V1ET1 reliable?

The price and inventory of BZX84C5V1ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C5V1ET1 is usually 5 days.

3.What payment methods are accepted for BZX84C5V1ET1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C5V1ET1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84C5V1ET1?

BZX84C5V1ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84C5V1ET1 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 BZX84C5V1ET1?

For technical support, including BZX84C5V1ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C5V1ET1 requirements.

6.How does Aetrix verify that BZX84C5V1ET1 is sourced from the original manufacturer or authorized distributors?

All BZX84C5V1ET1 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 BZX84C5V1ET1 meets industry standards.

7.What is the process for return or replacement of BZX84C5V1ET1?

All BZX84C5V1ET1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C5V1ET1, 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 BZX84C5V1ET1 part is unused and in its original packaging.

Return procedure for BZX84C5V1ET1:

1.Submit a request within 90 days.

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

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