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

onsemi 1N5357B

Name: 1N5357B
Brand: onsemi
SKU: 1N5357B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5357B

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: T-18, Axial

Datasheet:: 1N5357B.pdf

Description:: DIODE ZENER 20V 5W AXIAL

Quantity:: RFQ Add To RFQ list

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Product details

Overview

1N5357B from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 20 V (±5%), maximum zener impedance of 65 Ω at 3 mA test current, and surge rating of 237 A at 8.3 ms. It operates across −65 °C to +200 °C, features ESD rating >16 kV (HBM), and is used for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation.

For engineers reviewing the 1N5357B datasheet, pinout, applications, or equivalent options, key selection criteria include its 20 V nominal zener voltage, 65 Ω dynamic impedance at IZT = 3 mA, 5 W steady-state power dissipation, ±5% tolerance, and axial lead (Case 017AA) package compatibility with through-hole PCB layouts.

Technical Context

The 1N5357B employs a silicon-oxide passivated junction for stable voltage regulation under DC and pulsed conditions. Its thermal design supports junction-to-lead resistance of 25 °C/W at TL = 25 °C with 3/8″ lead length, enabling reliable operation up to 150 °C continuous and 200 °C for low-duty-cycle pulses.

It delivers tight regulation with leakage current ≤0.4 mA at VR = 15.2 V and maintains zener voltage stability across temperature via a positive temperature coefficient typical of 20 V-class devices. The device is rated for non-repetitive surge currents up to 237 A (8.3 ms square wave), validated per JEDEC standards.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	19 V min / 20 V nom / 21 V max - defines regulated output voltage with ±5% tolerance for feedback and clamping accuracy
Power Dissipation (P_D)	5 W at T_L = 25 °C - sets maximum continuous DC power handling before thermal derating begins
Zener Impedance (Z_ZT)	65 Ω max at I_ZT = 3 mA - determines regulation stiffness and AC ripple rejection in shunt regulator designs
Leakage Current (I_R)	≤0.4 mA at V_R = 15.2 V - ensures minimal standby current in high-impedance bias networks
Surge Current (I_RM)	237 A peak at 8.3 ms - enables transient overvoltage suppression without failure in line-powered systems
Junction Temp Range	−65 °C to +200 °C - supports operation in automotive engine compartments and industrial environments
ESD Rating	Class 3 (>16 kV HBM) - provides robustness against handling-induced electrostatic discharge during assembly

Pinout & Package

1N5357B uses an axial-lead, transfer-molded plastic package (Case 017AA) with cathode indicated by a band. Leads are corrosion-resistant and solderable; maximum soldering temperature is 260 °C at 1/16″ from case for 10 seconds.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference node	Connected to lower potential side in shunt regulation; forms return path for zener current
Cathode	Zener breakdown terminal / regulated output node	Provides stable 20 V reference when reverse-biased; connected to regulated rail or error amplifier input

Key Features

Feature	Design Value
Silicon-oxide passivated junction	Enables stable long-term voltage regulation and reduced parameter drift over time and temperature
Surge rating up to 237 A (8.3 ms)	Withstands lightning-induced transients and inductive switching spikes without degradation
ESD rating >16 kV (HBM)	Eliminates need for external ESD protection in board-level handling and low-energy interface circuits
Pb-free compliant (G suffix)	Meets RoHS Directive 2011/65/EU and facilitates environmentally compliant manufacturing
Maximum six parameters guaranteed	Ensures full specification compliance across V_Z, Z_ZT, I_R, I_ZM, surge, and thermal resistance

Applications

Switch-Mode Power Supply Feedback	Overvoltage Protection Clamp
Use Scenario: Used in the optocoupler feedback network of isolated flyback converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference element providing precise 20 V threshold for TL431-like comparator action. Use Value: Maintains ±1.5% output regulation across line/load/temperature due to low 65 Ω impedance and tight ±5% V_Z tolerance.	Use Scenario: Placed across DC bus rails to clamp transient overvoltages exceeding safe operating limits. IC Role / Device Role / Timing Role: Passive shunt clamp absorbing energy from inductive kickback or ESD events. Use Value: Survives 237 A surges (8.3 ms) without parametric shift, protecting downstream MOSFETs and controllers.
Industrial Sensor Reference	Programmable Logic Controller Input Protection
Use Scenario: Supplies stable 20 V reference to analog front-end circuitry in 4–20 mA transmitter modules. IC Role / Device Role / Timing Role: Precision voltage reference source for DACs and op-amp biasing. Use Value: Delivers <0.4 mA leakage at 15.2 V, minimizing error in high-impedance sensor signal paths.	Use Scenario: Integrated into digital input conditioning circuits to limit input voltage to safe logic levels. IC Role / Device Role / Timing Role: Input-stage overvoltage suppressor for 24 V PLC discrete inputs. Use Value: Withstands >16 kV HBM ESD events and clamps fast transients to ≤21 V, preventing controller latch-up.

Switch-Mode Power Supply Feedback

Overvoltage Protection Clamp

Use Scenario: Used in the optocoupler feedback network of isolated flyback converters to regulate output voltage.

IC Role / Device Role / Timing Role: Zener reference element providing precise 20 V threshold for TL431-like comparator action.

Use Value: Maintains ±1.5% output regulation across line/load/temperature due to low 65 Ω impedance and tight ±5% V_Z tolerance.

Use Scenario: Placed across DC bus rails to clamp transient overvoltages exceeding safe operating limits.

IC Role / Device Role / Timing Role: Passive shunt clamp absorbing energy from inductive kickback or ESD events.

Use Value: Survives 237 A surges (8.3 ms) without parametric shift, protecting downstream MOSFETs and controllers.

Industrial Sensor Reference

Programmable Logic Controller Input Protection

Use Scenario: Supplies stable 20 V reference to analog front-end circuitry in 4–20 mA transmitter modules.

IC Role / Device Role / Timing Role: Precision voltage reference source for DACs and op-amp biasing.

Use Value: Delivers <0.4 mA leakage at 15.2 V, minimizing error in high-impedance sensor signal paths.

Use Scenario: Integrated into digital input conditioning circuits to limit input voltage to safe logic levels.

IC Role / Device Role / Timing Role: Input-stage overvoltage suppressor for 24 V PLC discrete inputs.

Use Value: Withstands >16 kV HBM ESD events and clamps fast transients to ≤21 V, preventing controller latch-up.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5357BRLG	Identical electrical specs; supplied in 4000-unit tape-and-reel format instead of 1000-unit box	No functional difference; optimized for automated SMT placement despite axial lead form factor	Select 1N5357BRLG for high-volume production requiring pick-and-place compatibility
BZX85C20	Same 20 V nominal zener voltage but rated at 1.3 W only; higher Z_ZT (100 Ω) and lower surge rating (100 A)	Not suitable for 5 W continuous or high-surge applications; limited to low-power references	Choose BZX85C20 only where power dissipation remains below 1.2 W and surge immunity is secondary

Compared with 1N5357B, 1N5357BRLG offers identical performance in reel packaging for automation, while BZX85C20 trades 5 W capability and 237 A surge resilience for smaller size and lower cost in non-demanding reference roles.

Availability

1N5357B is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and programmable logic controller input protection requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for 1N5357B 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 belongs to onsemi's Surmetic™ 40 Zener regulator family, engineered for high-reliability voltage reference and clamping in harsh-environment power systems where stability, surge resilience, and wide temperature operation are critical.

FAQ

What is the nominal zener voltage and tolerance of the 1N5357B?

The 1N5357B has a nominal zener voltage of 20 V with a tolerance of ±5%, meaning its actual zener voltage falls between 19 V and 21 V at I_ZT = 3 mA. This tight tolerance is guaranteed per JEDEC standard and applies specifically to the "B" suffix variant, ensuring predictable regulation in feedback and reference circuits where accuracy is essential.

What is the maximum continuous power dissipation for the 1N5357B?

The 1N5357B is rated for a maximum steady-state power dissipation of 5 W at lead temperature (T_L) = 25 °C with 3/8″ lead length. Above 25 °C, it must be derated at 40 mW/°C. This rating directly determines usable current headroom in shunt regulator designs and requires appropriate PCB copper area or heatsinking for sustained operation.

Does the 1N5357B have Pb-free packaging?

Yes, the 1N5357B is available in Pb-free packaging, indicated by the "G" suffix (e.g., 1N5357BG). This complies with RoHS Directive 2011/65/EU and eliminates lead content in solderable leads and mold compound, supporting environmentally compliant manufacturing without sacrificing electrical or thermal performance.

What is the zener impedance of the 1N5357B and why does it matter?

The 1N5357B has a maximum zener impedance (Z_ZT) of 65 Ω at I_ZT = 3 mA. This value quantifies how tightly the device regulates voltage under varying load or ripple current - lower impedance yields better AC rejection and tighter DC regulation, making it suitable for precision feedback paths in power converters where output stability is critical.

Can the 1N5357B withstand high-energy transients?

Yes, the 1N5357B is rated for a non-repetitive peak surge current of 237 A at 8.3 ms pulse width, validated per industry-standard surge testing. This allows it to absorb high-energy transients - such as those from relay coil de-energization or lightning-induced surges - without parametric shift or catastrophic failure, enhancing system robustness in industrial and power electronics applications.

1N5357B Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: T-18, Axial

Packaging:: Bulk

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 20 V

Tolerance:: ±5%

Power - Max:: 5 W

Impedance (Max) (Zzt):: 3 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 15.2 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

1N5357B FAQ

1.How can I place an order for 1N5357B through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5357B 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 1N5357B reliable?

The price and inventory of 1N5357B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5357B is usually 5 days.

3.What payment methods are accepted for 1N5357B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5357B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5357B?

1N5357B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5357B 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 1N5357B?

For technical support, including 1N5357B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5357B requirements.

6.How does Aetrix verify that 1N5357B is sourced from the original manufacturer or authorized distributors?

All 1N5357B 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 1N5357B meets industry standards.

7.What is the process for return or replacement of 1N5357B?

All 1N5357B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5357B, 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 1N5357B part is unused and in its original packaging.

Return procedure for 1N5357B:

1.Submit a request within 90 days.

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

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