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

onsemi SZBZX84C5V1LT3

Name: SZBZX84C5V1LT3
Brand: onsemi
SKU: SZBZX84C5V1LT3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZBZX84C5V1LT3

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: SZBZX84C5V1LT3.pdf

Description:: DIODE ZENER 5.1V 225MW SOT23

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Product details

Overview

SZBZX84C5V1LT3 from onsemi is a 5.1 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 60 Ω dynamic impedance at 5 mA test current and −2.7 mV/°C temperature coefficient - used for precision voltage reference and overvoltage protection in portable power rails.

For engineers reviewing the SZBZX84C5V1LT3 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener tolerance (±5%), thermal coefficient, leakage current at 2 V reverse bias (≤2 µA), and compatibility with automated SMT assembly on high-density PCBs.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable 5.1 V output across load variations by conducting reverse current above breakdown threshold. Its SOT-23 package features cathode-marked terminal 3 and unconnected terminal 2, enabling compact placement in space-constrained DC-DC feedback paths.

Designed for operation at 5 mA nominal Zener test current, it delivers 225 mW power rating on FR-5 board with 556 °C/W junction-to-ambient thermal resistance. The −2.7 mV/°C temperature coefficient ensures predictable drift over −65°C to +150°C operating range.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.8 V min / 5.1 V nom / 5.4 V max @ I_ZT = 5 mA - defines regulated voltage window under standard test conditions
Zener Impedance (Z_ZT)	60 Ω max @ I_ZT = 5 mA - determines output voltage stability under varying load current
Reverse Leakage Current	≤2 µA @ V_R = 2 V - limits standby power loss in low-current bias networks
Power Dissipation	225 mW on FR-5 board @ T_A = 25°C - sets maximum continuous power handling in standard PCB layout
Temperature Coefficient	−2.7 mV/°C @ I_ZT = 5 mA - quantifies voltage drift per degree Celsius for thermal design margining
Junction Temperature Range	−65°C to +150°C - supports automotive under-hood and industrial ambient environments
ESD Rating	Class 3 (>16 kV) HBM - enables robust handling during board assembly without additional protection

Pinout & Package

SOT-23 (Case 318-08) surface-mount plastic package with void-free thermosetting molding, corrosion-resistant finish, and UL 94 V-0 flammability rating. Cathode indicated by polarity band on terminal 3.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Connected to lower-potential node in shunt regulation; forward-biased during normal operation
2	No Connection	Internally unconnected; must remain floating - no PCB trace or pad required
3	Cathode	Connected to regulated voltage node; reverse-biased during Zener conduction

Key Features

Feature	Design Value
225 mW Power Rating on FR-5 Board	Enables use in compact 3.3 V/5 V rail clamping without heatsinking on standard PCB material
ESD Rating >16 kV (HBM)	Eliminates need for external ESD protection in handheld and portable designs
Tight Thermal Coefficient (−2.7 mV/°C)	Reduces voltage error to <±25 mV over 0–70°C ambient range for stable reference applications
AEC-Q101 Qualified	Validated for automotive electronics including infotainment power supplies and body control modules
Pb-Free Packaging (G suffix variant)	Complies with RoHS and ELV directives without sacrificing solderability or thermal performance

Applications

USB Power Rail Protection	Microcontroller Reset Circuit
Use Scenario: Clamping 5 V USB VBUS line against transient overvoltage events in portable accessories. IC Role / Device Role / Timing Role: Shunt regulator providing low-impedance path to ground when VBUS exceeds 5.4 V. Use Value: Limits peak voltage to ≤5.4 V with <2 µA leakage at 2 V, preserving USB compliance and preventing downstream IC damage.	Use Scenario: Generating precise 5.1 V reference for RC reset timing network in MCU-based edge sensors. IC Role / Device Role / Timing Role: Stable voltage source setting threshold for reset supervisor IC or comparator input. Use Value: Maintains ±5% regulation over temperature and current, ensuring consistent reset assertion timing across −40°C to +85°C.
Automotive Body Control Module	Industrial Sensor Signal Conditioning
Use Scenario: Regulating 5 V supply for LIN transceiver bias in door module electronics. IC Role / Device Role / Timing Role: Local voltage reference stabilizing transceiver V_CC despite battery voltage fluctuations. Use Value: AEC-Q101 qualification and −65°C to +150°C operation ensure reliability in under-dash environments with wide thermal cycling.	Use Scenario: Providing stable 5.1 V bias for op-amp instrumentation amplifiers in 4–20 mA loop transmitters. IC Role / Device Role / Timing Role: Precision shunt reference establishing common-mode voltage for analog front-end circuitry. Use Value: 60 Ω Zener impedance minimizes output variation under load changes, improving ADC measurement accuracy by <0.1% FS.

USB Power Rail Protection

Microcontroller Reset Circuit

Use Scenario: Clamping 5 V USB VBUS line against transient overvoltage events in portable accessories.

IC Role / Device Role / Timing Role: Shunt regulator providing low-impedance path to ground when VBUS exceeds 5.4 V.

Use Value: Limits peak voltage to ≤5.4 V with <2 µA leakage at 2 V, preserving USB compliance and preventing downstream IC damage.

Use Scenario: Generating precise 5.1 V reference for RC reset timing network in MCU-based edge sensors.

IC Role / Device Role / Timing Role: Stable voltage source setting threshold for reset supervisor IC or comparator input.

Use Value: Maintains ±5% regulation over temperature and current, ensuring consistent reset assertion timing across −40°C to +85°C.

Automotive Body Control Module

Industrial Sensor Signal Conditioning

Use Scenario: Regulating 5 V supply for LIN transceiver bias in door module electronics.

IC Role / Device Role / Timing Role: Local voltage reference stabilizing transceiver V_CC despite battery voltage fluctuations.

Use Value: AEC-Q101 qualification and −65°C to +150°C operation ensure reliability in under-dash environments with wide thermal cycling.

Use Scenario: Providing stable 5.1 V bias for op-amp instrumentation amplifiers in 4–20 mA loop transmitters.

IC Role / Device Role / Timing Role: Precision shunt reference establishing common-mode voltage for analog front-end circuitry.

Use Value: 60 Ω Zener impedance minimizes output variation under load changes, improving ADC measurement accuracy by <0.1% FS.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84C5V1LT3	Standard-grade version without "SZ" prefix; not AEC-Q101 qualified	Limited to commercial-grade applications; unsuitable for automotive use	Select when cost sensitivity outweighs automotive qualification requirements
SZBZX84B5V1LT1G	Tighter 2% Zener tolerance (5.00–5.20 V), Pb-free, but 3000/reel packaging only	Better voltage accuracy for precision references; lower volume packaging increases unit cost	Choose when ±2% regulation is mandatory and tape-and-reel quantity aligns with production needs

Compared with SZBZX84C5V1LT3, BZX84C5V1LT3 lacks automotive qualification and tighter process controls, while SZBZX84B5V1LT1G trades ±5% tolerance for ±2% accuracy and Pb-free compliance at reduced packaging flexibility - making SZBZX84C5V1LT3 optimal for cost-sensitive, AEC-Q101–required 5.1 V regulation.

Availability

SZBZX84C5V1LT3 is available at Aetrix Electronics and suitable for USB power protection, microcontroller reset circuits, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for SZBZX84C5V1LT3 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 silicon solutions for automotive, industrial, cloud computing, and IoT applications.

SZBZX84CxxxLT3 belongs to the AEC-Q101–qualified Zener regulator family designed specifically for automotive and high-reliability portable electronics requiring stable voltage references in ultra-small SOT-23 packages.

FAQ

What is the Zener voltage tolerance of SZBZX84C5V1LT3?

The SZBZX84C5V1LT3 has a nominal Zener voltage of 5.1 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 4.8 V and 5.4 V when tested at 5 mA Zener current and 25°C ambient temperature. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet for the SZBZX84CxxxLT1G series. The SZBZX84C5V1LT3 maintains this specification across its qualified operating temperature range.

Is SZBZX84C5V1LT3 suitable for automotive applications?

Yes, SZBZX84C5V1LT3 is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi datasheet. Its construction, testing, and process controls meet automotive reliability standards, and it operates across the full −65°C to +150°C junction temperature range required for under-hood and cabin electronics. The "SZ" prefix denotes compliance with automotive-specific site and change control requirements - a key differentiator from non-SZ variants like BZX84C5V1LT3.

What is the pin configuration and function of each terminal on SZBZX84C5V1LT3?

SZBZX84C5V1LT3 uses the standard SOT-23 pinout: Terminal 1 is the anode, Terminal 2 is internally unconnected (no bond wire), and Terminal 3 is the cathode, marked by a polarity band. This configuration is documented in the "Electrical Characteristics" section (page 3) and "Package Dimensions" (page 7) of the onsemi datasheet. During Zener operation, reverse bias is applied between terminals 3 (cathode) and 1 (anode), with terminal 2 left floating on the PCB layout.

Does SZBZX84C5V1LT3 have Pb-free packaging?

Yes, SZBZX84C5V1LT3 is offered in Pb-free packaging, as indicated by the "G" suffix in the full part number SZBZX84C5V1LT3G referenced in the Ordering Information table (page 2). The datasheet confirms that all "G"-suffixed variants comply with RoHS Directive 2011/65/EU and are compatible with standard lead-free reflow profiles. The base part number SZBZX84C5V1LT3 may be supplied in either Pb-free or legacy SnPb form depending on date code and manufacturing lot - verification via onsemi's official marking guide is recommended for final BOM release.

What is the maximum power dissipation of SZBZX84C5V1LT3 on a standard FR-5 PCB?

SZBZX84C5V1LT3 is rated for 225 mW total power dissipation on an FR-5 board at 25°C ambient temperature, with derating of 1.8 mW/°C above that temperature. This value is specified in the "Maximum Ratings" table (page 2) and applies to typical 1.0 × 0.75 × 0.62 inch FR-5 test board conditions. Exceeding this limit risks thermal runaway or accelerated parametric shift; designers must verify board copper area, airflow, and adjacent heat sources to maintain safe junction temperature in actual layouts.

SZBZX84C5V1LT3 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

Product Status:: Active

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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

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

SZBZX84C5V1LT3 FAQ

1.How can I place an order for SZBZX84C5V1LT3 through Aetrix?

Please submit a Request for Quotation (RFQ) for SZBZX84C5V1LT3 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 SZBZX84C5V1LT3 reliable?

The price and inventory of SZBZX84C5V1LT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C5V1LT3 is usually 5 days.

3.What payment methods are accepted for SZBZX84C5V1LT3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C5V1LT3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZBZX84C5V1LT3?

SZBZX84C5V1LT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZBZX84C5V1LT3 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 SZBZX84C5V1LT3?

For technical support, including SZBZX84C5V1LT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C5V1LT3 requirements.

6.How does Aetrix verify that SZBZX84C5V1LT3 is sourced from the original manufacturer or authorized distributors?

All SZBZX84C5V1LT3 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 SZBZX84C5V1LT3 meets industry standards.

7.What is the process for return or replacement of SZBZX84C5V1LT3?

All SZBZX84C5V1LT3 units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C5V1LT3, 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 SZBZX84C5V1LT3 part is unused and in its original packaging.

Return procedure for SZBZX84C5V1LT3:

1.Submit a request within 90 days.

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

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