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

onsemi 1N5333BG

Name: 1N5333BG
Brand: onsemi
SKU: 1N5333BG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5333BG

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: T-18, Axial

Datasheet:: 1N5333BG.pdf

Description:: DIODE ZENER 3.3V 5W AXIAL

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Product details

Overview

1N5333BG from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 3.3 V, ±5% tolerance, 380 Ω maximum zener impedance at 3 mA test current, and 1440 A peak surge current rating for 8.3 ms pulses. It serves as a precision voltage reference or shunt regulator in low-voltage power supply feedback loops, overvoltage protection circuits, and analog signal conditioning stages.

For engineers reviewing the 1N5333BG datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.3 V regulation point, 380 Ω dynamic impedance, 1 A maximum DC zener current, Pb-free Surmetic 40 plastic package, and Class 3 ESD robustness (>16 kV HBM).

Technical Context

This device operates as a silicon-oxide passivated junction Zener diode optimized for stable DC voltage regulation at low voltages. Its 3.3 V nominal breakdown is specified at IZT = 3 mA with tight ±5% tolerance and temperature coefficient near zero in the 3–10 V range.

The 1N5333BG delivers 5 W steady-state power dissipation at TL = 25°C with 25 °C/W junction-to-lead thermal resistance, and withstands up to 180 W non-repetitive surge energy (8.3 ms square wave) - critical for transient suppression in industrial control inputs and sensor interface rails.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.3 V nominal, 3.14–3.47 V min/max - defines precise regulation threshold for 3.3 V system rails
Zener Test Current (I_ZT)	3 mA - standard bias point for specifying V_Z and dynamic impedance
Zener Impedance (Z_ZT)	380 Ω max at I_ZT - determines output voltage deviation under load variation
Max DC Zener Current (I_ZM)	1440 mA - derived from 5 W / 3.3 V; sets upper limit for continuous regulation current
Surge Current (I_R)	1440 A @ 8.3 ms - enables robust transient clamping without failure
ESD Rating	Class 3 (>16 kV HBM) - ensures reliability in handling and board-level ESD events
Package	Surmetic 40, axial lead, Case 017AA - industry-standard through-hole package with cathode band marking

Pinout & Package

1N5333BG uses an axial-lead plastic package (Case 017AA) with cathode identified by a painted band. Leads are solderable per J-STD-020, rated for 260°C for 10 seconds at 1/16 inch from case.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential node; carries forward current during bias or surge conduction
Cathode	Zener breakdown terminal	Connected to regulated voltage rail; maintains stable 3.3 V reference when reverse-biased above V_Z

Key Features

Feature	Design Value
Low-voltage precision regulation	3.3 V ±5% with 380 Ω Z_ZT supports tight-tolerance 3.3 V supply monitoring and feedback
High surge robustness	1440 A peak surge current (8.3 ms) enables reliable transient suppression in industrial I/O protection
Pb-free Surmetic 40 package	Void-free transfer-molded plastic meets RoHS and provides environmental sealing for harsh ambient operation
ESD-hardened junction	Class 3 HBM (>16 kV) eliminates need for external ESD protection in sensor front-ends and control interfaces

Applications

3.3 V Power Supply Regulation	Industrial Sensor Signal Conditioning
Use Scenario: Stabilizing output of linear regulators or LDOs powering microcontrollers and digital logic. IC Role / Device Role / Timing Role: Shunt voltage reference providing feedback to error amplifier or clamping excess voltage. Use Value: Maintains 3.3 V ±0.165 V across load variations due to tight 5% tolerance and low 380 Ω impedance.	Use Scenario: Biasing and protecting analog sensor outputs (e.g., RTDs, bridge transducers) before ADC input. IC Role / Device Role / Timing Role: Low-voltage clamp limiting signal swing to prevent ADC saturation or op-amp rail damage. Use Value: 3.3 V clamping threshold aligns with common SAR ADC reference rails, minimizing signal distortion.
Overvoltage Protection for MCU GPIO	Reference Voltage Source for Analog Circuits
Use Scenario: Protecting microcontroller input pins from accidental 5 V or higher voltage injection. IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting fault current away from sensitive CMOS inputs. Use Value: 1440 A surge rating absorbs high-energy transients without degradation, preserving long-term GPIO integrity.	Use Scenario: Providing stable 3.3 V reference for precision op-amp biasing, comparator thresholds, or DAC references. IC Role / Device Role / Timing Role: Passive voltage reference establishing fixed potential independent of supply ripple. Use Value: Silicon-oxide passivation ensures low leakage (<1 μA at 0.85 V) and stable V_Z over temperature for repeatable analog performance.

3.3 V Power Supply Regulation

Industrial Sensor Signal Conditioning

Use Scenario: Stabilizing output of linear regulators or LDOs powering microcontrollers and digital logic.

IC Role / Device Role / Timing Role: Shunt voltage reference providing feedback to error amplifier or clamping excess voltage.

Use Value: Maintains 3.3 V ±0.165 V across load variations due to tight 5% tolerance and low 380 Ω impedance.

Use Scenario: Biasing and protecting analog sensor outputs (e.g., RTDs, bridge transducers) before ADC input.

IC Role / Device Role / Timing Role: Low-voltage clamp limiting signal swing to prevent ADC saturation or op-amp rail damage.

Use Value: 3.3 V clamping threshold aligns with common SAR ADC reference rails, minimizing signal distortion.

Overvoltage Protection for MCU GPIO

Reference Voltage Source for Analog Circuits

Use Scenario: Protecting microcontroller input pins from accidental 5 V or higher voltage injection.

IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting fault current away from sensitive CMOS inputs.

Use Value: 1440 A surge rating absorbs high-energy transients without degradation, preserving long-term GPIO integrity.

Use Scenario: Providing stable 3.3 V reference for precision op-amp biasing, comparator thresholds, or DAC references.

IC Role / Device Role / Timing Role: Passive voltage reference establishing fixed potential independent of supply ripple.

Use Value: Silicon-oxide passivation ensures low leakage (<1 μA at 0.85 V) and stable V_Z over temperature for repeatable analog performance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4728A	3.3 V ±5%, 1 W rating, 10 Ω Z_ZT @ 76 mA - lower power, lower impedance, higher test current	Best suited for low-power bias networks; insufficient for 5 W continuous dissipation or high-surge environments	Select 1N5333BG when >1 W power handling, surge immunity, or industrial-grade reliability is required.
BZX84-C3V3	3.3 V ±5%, SOT-23 package, 300 mW rating, 95 Ω Z_ZT @ 5 mA - surface-mount, lower power, higher impedance	Designed for space-constrained PCBs; lacks axial-lead mechanical robustness and surge capability	Choose 1N5333BG for through-hole mounting, high-reliability industrial use, or where 1440 A surge rating is mandatory.

Compared with 1N4728A and BZX84-C3V3, the 1N5333BG offers 5× higher power rating, 10× higher surge current, and axial-lead mechanical stability - making it the only option among the three qualified for ruggedized 3.3 V regulation in factory automation and power supply feedback paths.

Availability

1N5333BG is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and embedded controller protection circuits requiring stable component supply and long-lifecycle availability.

Supply support for 1N5333BG 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, and cloud infrastructure markets.

The 1N53 series is designed for high-reliability voltage regulation in demanding environments - emphasizing tight tolerance, surge resilience, and Pb-free manufacturability for industrial power management and protection.

FAQ

What is the nominal zener voltage and tolerance of the 1N5333BG?

The 1N5333BG has a nominal zener voltage of 3.3 V with a guaranteed tolerance of ±5%, meaning its actual breakdown voltage falls between 3.14 V and 3.47 V at I_ZT = 3 mA and T_A = 25°C. This tight tolerance is maintained via silicon-oxide passivated junction technology and is validated per JEDEC standards for B-suffix devices.

What is the maximum continuous power dissipation for the 1N5333BG?

The 1N5333BG is rated for 5 W steady-state power dissipation at lead temperature (T_L) = 25°C with 3/8-inch lead length. Derating is required above 25°C at 40 mW/°C, resulting in zero dissipation capability at T_L = 150°C. Thermal design must account for junction-to-lead resistance of 25 °C/W.

Does the 1N5333BG have a Pb-free package?

Yes, the "G" suffix in 1N5333BG explicitly denotes a Pb-free Surmetic 40 axial-lead plastic package compliant with RoHS Directive 2011/65/EU. The package uses void-free, transfer-molded thermosetting plastic with corrosion-resistant, readily solderable leads rated for 260°C for 10 seconds.

What is the zener impedance of the 1N5333BG and why does it matter?

The 1N5333BG has a maximum zener impedance (Z_ZT) of 380 Ω measured at I_ZT = 3 mA. This value directly impacts regulation accuracy: lower impedance yields smaller output voltage variation under changing load current. At 3.3 V, 380 Ω corresponds to ~115 mV change per 300 μA load shift - critical for precision analog references.

Can the 1N5333BG be used for surge protection in industrial I/O lines?

Yes, the 1N5333BG is rated for 1440 A peak non-repetitive surge current at 8.3 ms pulse width - validated per Figure 5 of the onsemi datasheet. This makes it suitable for clamping fast transients on 3.3 V industrial I/O lines, provided external series impedance limits average power and thermal stress remains within 5 W limits.

1N5333BG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: T-18, Axial

Packaging:: Bulk

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 3.3 V

Tolerance:: ±5%

Power - Max:: 5 W

Impedance (Max) (Zzt):: 3 Ohms

Current - Reverse Leakage @ Vr:: 300 µA @ 1 V

Voltage - Forward (Vf) (Max) @ If:: 1.2 V @ 1 A

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: Axial

1N5333BG FAQ

1.How can I place an order for 1N5333BG through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5333BG 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 1N5333BG reliable?

The price and inventory of 1N5333BG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5333BG is usually 5 days.

3.What payment methods are accepted for 1N5333BG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5333BG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5333BG?

1N5333BG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5333BG 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 1N5333BG?

For technical support, including 1N5333BG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5333BG requirements.

6.How does Aetrix verify that 1N5333BG is sourced from the original manufacturer or authorized distributors?

All 1N5333BG 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 1N5333BG meets industry standards.

7.What is the process for return or replacement of 1N5333BG?

All 1N5333BG units undergo pre-shipment inspection (PSI). If there is an issue with 1N5333BG, 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 1N5333BG part is unused and in its original packaging.

Return procedure for 1N5333BG:

1.Submit a request within 90 days.

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

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