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

onsemi 1N5355B

Name: 1N5355B
Brand: onsemi
SKU: 1N5355B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5355B

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: T-18, Axial

Datasheet:: 1N5355B.pdf

Description:: DIODE ZENER 18V 5W AXIAL

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Product details

Overview

1N5355B from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 18 V (±5%), maximum zener impedance of 65 Ω at 2.5 mA test current, 264 A peak surge current capability at 8.3 ms, and ESD rating >16 kV per HBM. It operates from −65°C to +200°C and is used for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation.

For engineers reviewing the 1N5355B datasheet, pinout, applications, or equivalent options, key selection criteria include its 18 V nominal zener voltage, 65 Ω dynamic impedance at IZT = 2.5 mA, 75 A maximum DC zener current, 5 W steady-state power dissipation at TL = 25°C, and axial leaded CASE 017AA package compatibility with through-hole PCB assembly.

Technical Context

The 1N5355B employs a silicon-oxide passivated junction for stable voltage regulation and low leakage. Its zener voltage is specified at two test currents (10% and 50% of IZM) with 40 ±10 ms pulse duration, ensuring repeatable regulation under transient conditions.

Thermal performance is defined by junction-to-lead thermal resistance (θJL = 25 °C/W), derating of 40 mW/°C above 25°C, and maximum lead temperature of 260°C for 10 seconds during soldering. Polarity is marked by a cathode band on the axial body.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	17.1–18.9 V (±5% tolerance at I_ZT = 2.5 mA); enables precise 18 V reference in feedback networks
Max Power Dissipation	5 W at T_L = 25°C; supports robust regulation in medium-power supplies without heatsinking
Zener Impedance (Z_ZT)	65 Ω max at I_ZT = 2.5 mA; ensures low AC output impedance for stable regulation under load transients
Peak Surge Current	264 A at 8.3 ms; withstands high-energy line surges without failure
Reverse Leakage (I_R)	0.4 mA max at V_R = 13.7 V; minimizes standby current in low-power reference circuits
ESD Rating	>16 kV per Human Body Model; provides handling robustness during manual assembly and board-level integration
Operating Temp Range	−65°C to +200°C; suitable for automotive under-hood, industrial control, and aerospace environments

Pinout & Package

Package: Axial-lead, transfer-molded plastic CASE 017AA (Surmetic 40), void-free thermosetting material with corrosion-resistant leads and cathode polarity band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference node	Connected to lower-potential side of regulated circuit; forms reference ground return path in shunt regulator topologies
Cathode	Zener breakdown terminal / Regulation output node	Connected to input rail or error amplifier input; delivers stable 18 V reference when reverse-biased above V_Z

Key Features

Feature	Design Value
Silicon-oxide passivated junction	Enables tight V_Z tolerance (±5%) and long-term stability in humid or chemically aggressive environments
5 W steady-state power rating	Supports direct shunt regulation in 12–24 V systems without external series resistors or active components
264 A surge rating @ 8.3 ms	Protects downstream circuitry against IEC 61000-4-5 Level 4 surges without crowbar or TVS supplementation
Pb-free axial package (RoHS compliant)	Meets global environmental compliance requirements while maintaining solderability at 260°C for 10 s
−65°C to +200°C operating range	Validated for use in engine control units, downhole sensors, and military-grade power modules

Applications

Switch-Mode Power Supply Feedback	Overvoltage Clamp Protection
Use Scenario: Used in the optocoupler feedback loop of an isolated 24 V DC-DC converter to regulate output voltage. IC Role / Device Role: Shunt voltage reference providing precise 18 V threshold to drive optocoupler LED. Use Value: Maintains ±1% output regulation across line/load/temperature due to low 65 Ω Z_ZT and <0.4 mA leakage at 13.7 V.	Use Scenario: Placed across a 15 V rail to clamp transients exceeding 18 V during hot-swap events. IC Role / Device Role: Passive overvoltage protector absorbing energy from inductive kickback or ESD. Use Value: Withstands 264 A surges at 8.3 ms without degradation, eliminating need for parallel TVS diodes.
Industrial Sensor Reference	Programmable Logic Controller Input Conditioning
Use Scenario: Supplies stable 18 V bias to a pressure transducer bridge in a factory automation system. IC Role / Device Role: Precision voltage reference enabling ratiometric ADC measurements. Use Value: Temperature coefficient optimized for 18 V devices (Figure 3) ensures <±0.01%/°C drift over −40°C to +85°C.	Use Scenario: Regulates 18 V for digital input buffer ICs in a PLC backplane with shared 24 V supply. IC Role / Device Role: Local shunt regulator isolating logic inputs from supply ripple and noise. Use Value: 5 W rating allows continuous operation at full load; axial package fits standard DIN-rail mounting footprints.

Switch-Mode Power Supply Feedback

Overvoltage Clamp Protection

Use Scenario: Used in the optocoupler feedback loop of an isolated 24 V DC-DC converter to regulate output voltage.

IC Role / Device Role: Shunt voltage reference providing precise 18 V threshold to drive optocoupler LED.

Use Value: Maintains ±1% output regulation across line/load/temperature due to low 65 Ω Z_ZT and <0.4 mA leakage at 13.7 V.

Use Scenario: Placed across a 15 V rail to clamp transients exceeding 18 V during hot-swap events.

IC Role / Device Role: Passive overvoltage protector absorbing energy from inductive kickback or ESD.

Use Value: Withstands 264 A surges at 8.3 ms without degradation, eliminating need for parallel TVS diodes.

Industrial Sensor Reference

Programmable Logic Controller Input Conditioning

Use Scenario: Supplies stable 18 V bias to a pressure transducer bridge in a factory automation system.

IC Role / Device Role: Precision voltage reference enabling ratiometric ADC measurements.

Use Value: Temperature coefficient optimized for 18 V devices (Figure 3) ensures <±0.01%/°C drift over −40°C to +85°C.

Use Scenario: Regulates 18 V for digital input buffer ICs in a PLC backplane with shared 24 V supply.

IC Role / Device Role: Local shunt regulator isolating logic inputs from supply ripple and noise.

Use Value: 5 W rating allows continuous operation at full load; axial package fits standard DIN-rail mounting footprints.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5355	Same electrical specs but non-Pb-free; RoHS non-compliant	Not suitable for EU/China export or new medical designs requiring Pb-free compliance	Select 1N5355B when RoHS, REACH, or J-STD-609 moisture sensitivity compliance is required.
BZX85C18	1.3 W rating, 20 Ω Z_ZT, 18 V ±5%, TO-204AA package	Limited to low-power references; cannot replace 1N5355B in 5 W applications without redesign	Choose BZX85C18 only for space-constrained PCBs where 1.3 W dissipation suffices and axial leads are not permitted.

Compared with 1N5355 and BZX85C18, the 1N5355B delivers higher power handling (5 W vs. 1.3 W), superior surge immunity (264 A vs. ~100 A), and guaranteed Pb-free compliance-making it the preferred choice for industrial power regulation where reliability, thermal margin, and regulatory alignment are critical.

Availability

1N5355B is available at Aetrix Electronics and suitable for switch-mode power supply feedback, overvoltage clamp protection, and industrial sensor reference applications requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for 1N5355B 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, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 1N53 Series is part of onsemi's legacy Zener portfolio designed for high-reliability voltage regulation in harsh-environment applications-emphasizing tight tolerance, surge resilience, and extended temperature operation.

FAQ

What is the nominal zener voltage and tolerance of the 1N5355B?

The 1N5355B has a nominal zener voltage of 18 V with a tolerance of ±5%, meaning its actual zener voltage falls between 17.1 V and 18.9 V when tested at I_ZT = 2.5 mA. This tight tolerance is guaranteed per JEDEC standards and reflects the device's silicon-oxide passivated junction construction, making the 1N5355B suitable for precision reference applications where regulation accuracy is critical.

What is the maximum DC zener current (I_ZM) for the 1N5355B?

The maximum DC zener current for the 1N5355B is 75 A, calculated based on its 5 W power rating and maximum zener voltage of 18.9 V (5 W ÷ 18.9 V ≈ 0.265 A). However, the datasheet specifies 75 A as the peak non-repetitive surge current - the actual I_ZM is 278 mA (5 W ÷ 18 V). The 1N5355B's rated I_ZM is 75 mA per Table 3, consistent with its 2.5 mA I_ZT and 65 Ω Z_ZT; this value ensures stable regulation without thermal runaway under continuous DC bias.

Does the 1N5355B have a Pb-free package?

Yes, the 1N5355B is supplied in a Pb-free axial-lead package (CASE 017AA) compliant with RoHS Directive 2011/65/EU and J-STD-609. The "G" suffix in ordering codes (e.g., 1N5355BRLG) explicitly denotes Pb-free construction. Lead finish is corrosion-resistant and readily solderable at 260°C for 10 seconds, and all external surfaces meet IPC-J-STD-020 moisture sensitivity level 1 requirements.

What is the zener impedance (Z_ZT) of the 1N5355B and why does it matter?

The 1N5355B has a maximum zener impedance of 65 Ω at I_ZT = 2.5 mA. This parameter quantifies how much the output voltage changes with varying current - a lower Z_ZT means better regulation under dynamic load conditions. At 65 Ω, the 1N5355B maintains tighter voltage stability than general-purpose Zeners (often >200 Ω), making it ideal for feedback loops in power converters where ripple rejection and transient response are essential.

Can the 1N5355B be used in high-temperature environments like automotive under-hood applications?

Yes, the 1N5355B is rated for operation from −65°C to +200°C, with DC operation up to +150°C and pulsed conditions up to +200°C. Its silicon-oxide passivated junction and thermosetting plastic package ensure stable zener voltage and low leakage across this range. This makes the 1N5355B suitable for under-hood ECUs, battery management systems, and other automotive subsystems where ambient temperatures exceed 125°C - provided lead temperature is maintained ≤25°C via proper PCB copper pour or heatsinking.

1N5355B Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: T-18, Axial

Packaging:: Bulk

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 18 V

Tolerance:: ±5%

Power - Max:: 5 W

Impedance (Max) (Zzt):: 2.5 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 13.7 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

1N5355B FAQ

1.How can I place an order for 1N5355B through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5355B 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 1N5355B reliable?

The price and inventory of 1N5355B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5355B is usually 5 days.

3.What payment methods are accepted for 1N5355B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5355B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5355B?

1N5355B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5355B 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 1N5355B?

For technical support, including 1N5355B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5355B requirements.

6.How does Aetrix verify that 1N5355B is sourced from the original manufacturer or authorized distributors?

All 1N5355B 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 1N5355B meets industry standards.

7.What is the process for return or replacement of 1N5355B?

All 1N5355B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5355B, 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 1N5355B part is unused and in its original packaging.

Return procedure for 1N5355B:

1.Submit a request within 90 days.

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

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