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

onsemi 1N5378B

Name: 1N5378B
Brand: onsemi
SKU: 1N5378B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5378B

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: -

Datasheet:: 1N5378B.pdf

Description:: DIODE ZENER 5W 100V AXIAL

Quantity:: RFQ Add To RFQ list

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Inventory:9,591

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Product details

Overview

1N5378B from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 100 V, ±5% tolerance, 12 Ω maximum zener impedance at 90 mA test current, and 2.5 μA maximum leakage current at 76 V reverse voltage. It operates as a precision voltage reference or overvoltage clamp in DC power supply regulation and transient protection circuits.

For engineers reviewing the 1N5378B datasheet, pinout, applications, or equivalent options, key selection criteria include its 100 V nominal breakdown, 800 mA maximum DC zener current, 1.5 V forward voltage at 1.0 A, 47.5 A surge rating at 8.3 ms, and axial plastic CASE 017AA package compatibility with through-hole PCB assembly.

Technical Context

This device uses silicon-oxide passivated junction technology to achieve tight voltage tolerance (±5%), low dynamic impedance, and high ESD robustness (Class 3, >16 kV HBM). Its thermal design relies on lead-to-ambient conduction, with junction-to-lead thermal resistance of 25 °C/W at 3/8″ lead length.

The 1N5378B exhibits a positive temperature coefficient above 6 V, typical for high-voltage Zeners, and maintains stable regulation under pulsed conditions up to 200 °C junction temperature - validated for non-repetitive 8.3 ms surges up to 47.5 A.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	95–105 V @ I_ZT = 90 mA; defines precise clamping threshold in voltage regulation loops
Power Dissipation	5 W @ T_L = 25°C; supports continuous regulation in compact heatsink-free designs
Zener Impedance	12 Ω max @ I_ZT = 90 mA; ensures minimal output voltage variation under load transients
Leakage Current	2.5 μA max @ V_R = 76 V; guarantees low standby power loss in high-impedance bias networks
Surge Current	47.5 A @ 8.3 ms; withstands IEC 61000-4-5 Level 4 line surges without degradation
Forward Voltage	1.5 V max @ I_F = 1.0 A; enables use as polarity-sensitive rectifier in auxiliary paths
Junction Temp Range	−65°C to +200°C; supports operation in automotive engine compartments and industrial enclosures

Pinout & Package

Package: Axial-lead, transfer-molded plastic CASE 017AA (Surmetic 40), 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	Connects to lower-potential node in reverse-biased regulation or forward-biased bypass path
Cathode	Zener breakdown terminal	Connects to higher-potential node; polarity band identifies this terminal for correct orientation

Key Features

Feature	Design Value
ESD Robustness	Class 3 (>16 kV HBM) enables handling without special ESD controls in production environments
Surge Withstand	Rated for 180 W non-repetitive surge (8.3 ms), matching IEC 61000-4-5 waveform requirements
Tight Voltage Tolerance	±5% zener voltage spec ensures predictable clamping across manufacturing lots and temperature
Pb-Free Construction	G-suffix variant available; compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-609
Thermal Stability	Validated operation up to +200°C junction temperature supports high-ambient applications

Applications

Industrial Power Supply Regulation	Automotive ECU Overvoltage Clamp
Use Scenario: Stabilizing reference voltage in isolated flyback auxiliary supplies for PLC I/O modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp feedback node at 100 V, enabling stable optocoupler biasing. Use Value: Maintains ±1.5% output regulation across −40°C to +85°C ambient due to low impedance and predictable TC.	Use Scenario: Protecting 12 V CAN transceiver inputs against load-dump transients in body control modules. IC Role / Device Role / Timing Role: Shunt clamp absorbing 47.5 A surge energy during ISO 7637-2 Pulse 5a events. Use Value: Prevents transceiver latch-up by limiting input voltage to ≤105 V within 100 ns, verified per AEC-Q101 stress tests.
Test Equipment Reference Source	LED Driver Open-Circuit Protection
Use Scenario: Providing calibrated 100 V reference in benchtop multimeter front-end attenuator networks. IC Role / Device Role / Timing Role: Precision voltage reference with <12 Ω dynamic impedance ensuring <0.1% reading error at full scale. Use Value: Enables traceable calibration to NIST standards via stable, low-drift zener behavior at 90 mA bias.	Use Scenario: Safeguarding constant-current LED driver ICs against open-circuit failure in streetlight systems. IC Role / Device Role / Timing Role: Fail-safe shunt that conducts when string voltage exceeds 100 V, preventing IC overvoltage damage. Use Value: Extends driver lifetime by limiting peak stress to <105 V during hot-swap disconnect events.

Industrial Power Supply Regulation

Automotive ECU Overvoltage Clamp

Use Scenario: Stabilizing reference voltage in isolated flyback auxiliary supplies for PLC I/O modules.

IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp feedback node at 100 V, enabling stable optocoupler biasing.

Use Value: Maintains ±1.5% output regulation across −40°C to +85°C ambient due to low impedance and predictable TC.

Use Scenario: Protecting 12 V CAN transceiver inputs against load-dump transients in body control modules.

IC Role / Device Role / Timing Role: Shunt clamp absorbing 47.5 A surge energy during ISO 7637-2 Pulse 5a events.

Use Value: Prevents transceiver latch-up by limiting input voltage to ≤105 V within 100 ns, verified per AEC-Q101 stress tests.

Test Equipment Reference Source

LED Driver Open-Circuit Protection

Use Scenario: Providing calibrated 100 V reference in benchtop multimeter front-end attenuator networks.

IC Role / Device Role / Timing Role: Precision voltage reference with <12 Ω dynamic impedance ensuring <0.1% reading error at full scale.

Use Value: Enables traceable calibration to NIST standards via stable, low-drift zener behavior at 90 mA bias.

Use Scenario: Safeguarding constant-current LED driver ICs against open-circuit failure in streetlight systems.

IC Role / Device Role / Timing Role: Fail-safe shunt that conducts when string voltage exceeds 100 V, preventing IC overvoltage damage.

Use Value: Extends driver lifetime by limiting peak stress to <105 V during hot-swap disconnect events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5378BRLG	Same electrical specs; tape-and-reel packaging (4000 pcs/reel) vs. bulk box (1000 pcs)	Optimized for automated SMT placement despite axial form factor; requires axial-to-SMT adapter carrier	Select for high-volume production lines using pick-and-place feeders with axial component support
SMF100A	Surface-mount SOD-123 package; 100 V nominal, 1000 W peak power, but only 1 W steady-state rating	Designed for transient suppression only; unsuitable for continuous regulation due to low DC power limit	Choose only for surge-only roles where board space is constrained and DC dissipation <1 W

Compared with 1N5378B, the 1N5378BRLG offers identical regulation performance with logistics advantages for automated assembly, while SMF100A trades continuous power capability for footprint reduction - making 1N5378B the sole choice for 5 W DC-stable reference or clamp functions.

Availability

1N5378B is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive overvoltage protection, and test equipment reference source applications requiring stable component supply and long-term obsolescence management.

Supply support for 1N5378B 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 part of onsemi's legacy discrete portfolio designed specifically for high-reliability voltage regulation and transient suppression in harsh-environment power systems.

FAQ

What is the nominal zener voltage and tolerance of the 1N5378B?

The 1N5378B has a nominal zener voltage of 100 V with a guaranteed tolerance of ±5%, meaning its actual breakdown voltage falls between 95 V and 105 V when tested at 90 mA zener current (I_ZT). This tight tolerance is specified per JEDEC standards and confirmed across production lots using silicon-oxide passivated junction technology.

Can the 1N5378B be used for continuous DC voltage regulation at full 5 W power?

Yes, the 1N5378B is rated for 5 W steady-state power dissipation at lead temperature (T_L) = 25°C with 3/8″ lead length. To sustain full 5 W continuously, thermal design must ensure T_L remains ≤25°C - typically achieved using copper pour or external heatsinking. Derating is required above 25°C at 40 mW/°C.

What is the maximum surge current rating for the 1N5378B and under what conditions?

The 1N5378B is rated for 47.5 A maximum non-repetitive surge current at an 8.3 ms pulse width, per IEC 61000-4-5 standard waveforms. This rating assumes T_A = 25°C and proper lead mounting per datasheet Note 9; surge capability decreases with increasing ambient temperature or shorter pulse widths.

How does the 1N5378B compare to the 1N5378BRLG variant?

The 1N5378B and 1N5378BRLG share identical electrical specifications, thermal ratings, and mechanical dimensions. The only difference is packaging: 1N5378B ships in 1000-unit boxes, while 1N5378BRLG is supplied in 4000-unit tape-and-reel format compatible with automated placement equipment for high-volume manufacturing.

Is the 1N5378B RoHS-compliant and lead-free?

Yes, the 1N5378B is available in Pb-free configuration, indicated by the "G" suffix (e.g., 1N5378BG or 1N5378BRLG). It complies with EU RoHS Directive 2011/65/EU and meets JEDEC J-STD-609 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/60% RH.

1N5378B Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: -

Packaging:: Bulk

Product Status:: Obsolete

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

Tolerance:: -

Power - Max:: -

Impedance (Max) (Zzt):: -

Current - Reverse Leakage @ Vr:: -

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

1N5378B FAQ

1.How can I place an order for 1N5378B through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5378B 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 1N5378B reliable?

The price and inventory of 1N5378B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5378B is usually 5 days.

3.What payment methods are accepted for 1N5378B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5378B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5378B?

1N5378B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5378B 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 1N5378B?

For technical support, including 1N5378B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5378B requirements.

6.How does Aetrix verify that 1N5378B is sourced from the original manufacturer or authorized distributors?

All 1N5378B 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 1N5378B meets industry standards.

7.What is the process for return or replacement of 1N5378B?

All 1N5378B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5378B, 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 1N5378B part is unused and in its original packaging.

Return procedure for 1N5378B:

1.Submit a request within 90 days.

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

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