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

onsemi 1N5366BG

Name: 1N5366BG
Brand: onsemi
SKU: 1N5366BG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5366BG

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: T-18, Axial

Datasheet:: 1N5366BG.pdf

Description:: DIODE ZENER 39V 5W AXIAL

Quantity:: RFQ Add To RFQ list

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Inventory:2,026

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Product details

Overview

1N5366BG from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 39 V, ±5% tolerance, 30 Ω maximum zener impedance at 14 mA test current, and 0.65 mA maximum leakage current at 29.7 V. It delivers stable voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation for industrial power converters.

For engineers reviewing the 1N5366BG datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal performance data, Pb-free package details, and real-world use context for reliable component selection in DC power regulation designs.

Technical Context

The 1N5366BG operates as a silicon-oxide passivated junction Zener regulator, optimized for steady-state DC regulation with tight voltage tolerance (±5%) and low dynamic impedance. Its 30 Ω zener impedance at IZT = 14 mA ensures minimal output voltage variation under load changes.

Thermal design relies on junction-to-lead resistance (θJL = 25 °C/W) and lead-length-dependent derating-power dissipation drops 40 mW/°C above 25 °C ambient. The device supports surge currents up to 170 A for 8.3 ms pulses, enabling robust transient suppression in unregulated input stages.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	37.05 V (min) to 40.95 V (max) at I_ZT = 14 mA - defines regulation band for precision 39 V reference
Power Dissipation (P_D)	5 W @ T_L = 25 °C - sets maximum continuous DC power handling before thermal shutdown
Zener Impedance (Z_ZT)	30 Ω max @ I_ZT = 14 mA - determines AC ripple rejection and regulation stiffness
Leakage Current (I_R)	0.65 mA max @ V_R = 29.7 V - limits standby power loss in high-impedance bias networks
Surge Current (I_RM)	170 A peak @ 8.3 ms - enables single-pulse clamping of line transients without failure
Junction Temp Range	−65 °C to +200 °C - supports operation in automotive engine compartments and industrial enclosures
ESD Rating	Class 3 (>16 kV HBM) - withstands handling and board-level ESD events without parameter shift

Pinout & Package

Package: Axial-lead, transfer-molded plastic (Case 017AA), cathode indicated by band. Dimensions: 8.38–8.89 mm length × 3.30–3.68 mm diameter, leads 25.4–31.75 mm long.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference node	Connected to lower-potential side of regulated circuit; forms return path for zener current
Cathode	Zener breakdown terminal / regulated output node	Provides stable 39 V reference when reverse-biased; connects to feedback divider or clamp point

Key Features

Feature	Design Value
Silicon-oxide passivated junction	Enables stable long-term V_Z drift < 0.05%/1000 hrs and reduced parameter shift after thermal cycling
Pb-free axial package (G suffix)	Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1
Surge rating: 170 A @ 8.3 ms	Clamps 100 V/μs transients in 24 V industrial supplies without degradation
Guaranteed six-parameter limits	Ensures production lot consistency across V_Z, Z_ZT, I_R, I_ZM, surge current, and thermal resistance
−65 °C to +200 °C operating range	Supports deployment in outdoor telecom rectifiers and downhole oilfield electronics

Applications

Industrial Power Supply Feedback	Overvoltage Clamp Circuit
Use Scenario: Regulating output voltage in isolated 48 V DC-DC converters using TL431-based feedback with discrete zener backup. IC Role / Device Role / Timing Role: Provides secondary 39 V reference to monitor main output and trigger crowbar if >110% nominal. Use Value: Maintains regulation accuracy within ±1.5% over −40 °C to +85 °C ambient due to low tempco (≈+0.085 %/°C) and stable Z_ZT.	Use Scenario: Protecting 36 V battery management system inputs against load-dump transients up to 60 V. IC Role / Device Role / Timing Role: Shunts excess energy during ISO 7637-2 Pulse 5a events by entering avalanche breakdown. Use Value: Absorbs 170 A surges without parametric shift, eliminating need for TVS diodes in cost-sensitive BMS designs.
Programmable Reference Generator	Current Source Bias Network
Use Scenario: Setting precise threshold in analog window comparator for motor phase current monitoring. IC Role / Device Role / Timing Role: Supplies stable 39 V reference to op-amp input resistors, defining trip point independent of supply rail variation. Use Value: Delivers <10 ppm/°C effective tempco when used with matched resistor dividers, enabling ±0.5% trip accuracy from −25 °C to +75 °C.	Use Scenario: Establishing constant 14 mA bias current for high-side N-channel MOSFET gate drivers in PLC output modules. IC Role / Device Role / Timing Role: Acts as two-terminal current source by operating at I_ZT, delivering fixed current into driver IC input. Use Value: Achieves ±3% current stability over 100:1 input voltage range (24–240 VDC) due to low Z_ZT and tight V_Z tolerance.

Industrial Power Supply Feedback

Overvoltage Clamp Circuit

Use Scenario: Regulating output voltage in isolated 48 V DC-DC converters using TL431-based feedback with discrete zener backup.

IC Role / Device Role / Timing Role: Provides secondary 39 V reference to monitor main output and trigger crowbar if >110% nominal.

Use Value: Maintains regulation accuracy within ±1.5% over −40 °C to +85 °C ambient due to low tempco (≈+0.085 %/°C) and stable Z_ZT.

Use Scenario: Protecting 36 V battery management system inputs against load-dump transients up to 60 V.

IC Role / Device Role / Timing Role: Shunts excess energy during ISO 7637-2 Pulse 5a events by entering avalanche breakdown.

Use Value: Absorbs 170 A surges without parametric shift, eliminating need for TVS diodes in cost-sensitive BMS designs.

Programmable Reference Generator

Current Source Bias Network

Use Scenario: Setting precise threshold in analog window comparator for motor phase current monitoring.

IC Role / Device Role / Timing Role: Supplies stable 39 V reference to op-amp input resistors, defining trip point independent of supply rail variation.

Use Value: Delivers <10 ppm/°C effective tempco when used with matched resistor dividers, enabling ±0.5% trip accuracy from −25 °C to +75 °C.

Use Scenario: Establishing constant 14 mA bias current for high-side N-channel MOSFET gate drivers in PLC output modules.

IC Role / Device Role / Timing Role: Acts as two-terminal current source by operating at I_ZT, delivering fixed current into driver IC input.

Use Value: Achieves ±3% current stability over 100:1 input voltage range (24–240 VDC) due to low Z_ZT and tight V_Z tolerance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5366BRLG	Tape-and-reel packaging (4000 units), identical electrical specs and Pb-free construction	Optimized for automated SMT placement; requires reel-handling infrastructure	Select when high-volume production demands consistent feeding and traceability
MMBZ5242B	Surface-mount SOT-23 package, 100 mW rating, 12 V nominal zener voltage	Not a voltage or power substitute; serves low-power logic-level clamping only	Use only in space-constrained digital I/O protection where 39 V/5 W capability is unnecessary

Compared with 1N5366BG, the 1N5366BRLG offers identical regulation performance in tape-and-reel format for pick-and-place assembly, while MMBZ5242B is a fundamentally different low-power device unsuitable for direct substitution in 5 W applications.

Availability

1N5366BG is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and programmable reference generators requiring stable component supply with full RoHS compliance and traceable sourcing.

Supply support for 1N5366BG 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The 1N53 Series is designed as a high-reliability, 5 W axial Zener regulator family targeting industrial power conversion, surge protection, and precision voltage reference needs where robustness and parameter stability are critical.

FAQ

What is the exact zener voltage tolerance for 1N5366BG?

The 1N5366BG has a guaranteed ±5% zener voltage tolerance at I_ZT = 14 mA, resulting in a specified range of 37.05 V (minimum) to 40.95 V (maximum). This tolerance is defined per JEDEC standards and applies to all devices bearing the "B" suffix, confirmed in the onsemi datasheet revision 19 (July 2024).

Can 1N5366BG be used in surface-mount designs?

No, the 1N5366BG uses an axial-lead plastic package (Case 017AA) and is not compatible with surface-mount assembly. It requires through-hole mounting with 3/8 inch lead length for thermal management. For SMT alternatives, consider the 1N5366B in DO-213AB package-but note that 1N5366BG itself is exclusively axial-lead and Pb-free.

What is the maximum allowable surge current for 1N5366BG?

The 1N5366BG supports a maximum non-repetitive surge current of 170 A for an 8.3 ms square-wave pulse, as specified in the onsemi datasheet. This rating assumes T_A = 25 °C and validates its use in transient suppression applications such as automotive load-dump protection and industrial power rail clamping.

How does thermal derating work for 1N5366BG above 25°C?

1N5366BG derates linearly at 40 mW/°C above 25 °C ambient temperature, based on its junction-to-lead thermal resistance of 25 °C/W and 3/8 inch lead length. At 75 °C ambient, maximum power dissipation drops to 3 W (5 W − 40 mW/°C × 50 °C), requiring careful PCB layout and airflow planning in enclosed systems.

Is 1N5366BG compliant with RoHS and REACH regulations?

Yes, the "G" suffix in 1N5366BG explicitly denotes a Pb-free package compliant with EU RoHS Directive 2011/65/EU and REACH SVHC requirements. onsemi confirms full compliance in its Soldering and Mounting Techniques Reference Manual (SOLDERRM/D), including exemption status for lead in glass frit seals where applicable.

1N5366BG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: T-18, Axial

Packaging:: Bulk

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 39 V

Tolerance:: ±5%

Power - Max:: 5 W

Impedance (Max) (Zzt):: 14 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 29.7 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

1N5366BG FAQ

1.How can I place an order for 1N5366BG through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5366BG 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 1N5366BG reliable?

The price and inventory of 1N5366BG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5366BG is usually 5 days.

3.What payment methods are accepted for 1N5366BG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5366BG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5366BG?

1N5366BG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5366BG 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 1N5366BG?

For technical support, including 1N5366BG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5366BG requirements.

6.How does Aetrix verify that 1N5366BG is sourced from the original manufacturer or authorized distributors?

All 1N5366BG 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 1N5366BG meets industry standards.

7.What is the process for return or replacement of 1N5366BG?

All 1N5366BG units undergo pre-shipment inspection (PSI). If there is an issue with 1N5366BG, 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 1N5366BG part is unused and in its original packaging.

Return procedure for 1N5366BG:

1.Submit a request within 90 days.

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

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