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

onsemi 1N5381BG

Name: 1N5381BG
Brand: onsemi
SKU: 1N5381BG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5381BG

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: T-18, Axial

Datasheet:: 1N5381BG.pdf

Description:: DIODE ZENER 130V 5W AXIAL

Quantity:: RFQ Add To RFQ list

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Product details

Overview

1N5381BG from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 130 V, ±5% tolerance, maximum zener impedance of 10 Ω at 190 mA test current, and surge rating of 1250 A at 8.3 ms. It operates across −65 °C to +200 °C and is used for overvoltage protection and precision voltage reference in high-voltage DC power supplies.

For engineers reviewing the 1N5381BG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal behavior, Pb-free package details, and real-world design context for stable high-voltage regulation.

Technical Context

The 1N5381BG uses silicon-oxide passivated junction technology to achieve tight voltage regulation and low leakage. Its zener voltage is specified at IZT = 190 mA with VZ = 123.5–136.5 V, and it maintains stable regulation under transient surges up to 1250 A (8.3 ms).

Thermal performance is defined by junction-to-lead resistance θJL = 25 °C/W at TL = 25 °C with 3/8″ lead length, and its temperature coefficient is +0.12 mV/°C - typical for 130 V-class Zeners - enabling predictable drift compensation in fixed-bias reference designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	123.5 V (min) to 136.5 V (max) at I_ZT = 190 mA - defines regulated output range under nominal bias
Power Dissipation (P_D)	5 W at T_L = 25 °C - sets maximum continuous DC power handling before thermal derating
Zener Impedance (Z_ZT)	10 Ω max at I_ZT = 190 mA - determines regulation stiffness against load current variation
Surge Current (I_R)	1250 A peak at 8.3 ms - supports transient overvoltage clamping in AC line or inductive kick applications
Leakage Current (I_R)	0.5 mA max at V_R = 98.8 V - ensures minimal standby power loss in high-impedance bias networks
Junction Temp Range	−65 °C to +200 °C - enables operation in automotive under-hood, industrial motor drive, and aerospace environments
ESD Rating	Class 3 (>16 kV HBM) - provides robustness during PCB handling and assembly without added protection circuitry

Pinout & Package

Package: Axial-lead, transfer-molded plastic (Case 017AA), Pb-free, cathode indicated by band. Dimensions: 8.38–8.89 mm body 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; reverse-biased for zener operation
Cathode	Zener breakdown terminal / voltage reference output	Connected to higher-potential rail; delivers stable 130 V reference when reverse-biased above V_Z

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables precise voltage setting without external trimming in fixed-reference applications
10 Ω max zener impedance at 190 mA	Minimizes output voltage shift under ±10% load current changes in feedback networks
1250 A surge rating (8.3 ms)	Clamps lightning-induced transients or inductive switching spikes without failure
−65 °C to +200 °C operating range	Supports deployment in engine control units, downhole tools, and high-temp industrial sensors
Pb-free Surmetic™ 40 construction	Meets RoHS compliance and eliminates lead contamination risk in reflow and wave soldering

Applications

Industrial Power Supply Protection	High-Voltage Reference Generator
Use Scenario: Clamp overvoltage events on 110–150 VDC bus lines in PLC power modules during capacitor charging or relay coil de-energization. IC Role / Device Role / Timing Role: Standalone voltage clamp device absorbing transient energy via controlled avalanche breakdown. Use Value: Prevents damage to downstream DC-DC converters and microcontrollers by limiting bus voltage to ≤136.5 V during 8.3 ms surges up to 1250 A.	Use Scenario: Provide stable 130 V reference for analog front-end calibration in high-voltage battery monitoring systems. IC Role / Device Role / Timing Role: Precision shunt reference element delivering fixed voltage independent of supply ripple. Use Value: Enables <1% full-scale error in 16-bit ADC measurements due to tight ±5% V_Z tolerance and low 10 Ω Z_ZT.
Automotive Ignition Circuit Snubber	Telecom Line Card Overvoltage Guard
Use Scenario: Suppress inductive kickback from 12 V ignition coils driving 130 V-rated MOSFET gate drivers in HEV powertrain controllers. IC Role / Device Role / Timing Role: Passive snubbing component placed across coil primary to limit flyback voltage. Use Value: Extends MOSFET lifetime by capping peak voltage at 136.5 V while surviving repetitive 1250 A pulses per spark event.	Use Scenario: Protect Ethernet PHY interface ICs from induced surges on -48 V telecom power rails during lightning strikes. IC Role / Device Role / Timing Role: Primary overvoltage protector in redundant -48 V backup supply chain. Use Value: Maintains system uptime by clamping rail excursions to ≤136.5 V without latch-up, leveraging Class 3 ESD immunity during field servicing.

Industrial Power Supply Protection

High-Voltage Reference Generator

Use Scenario: Clamp overvoltage events on 110–150 VDC bus lines in PLC power modules during capacitor charging or relay coil de-energization.

IC Role / Device Role / Timing Role: Standalone voltage clamp device absorbing transient energy via controlled avalanche breakdown.

Use Value: Prevents damage to downstream DC-DC converters and microcontrollers by limiting bus voltage to ≤136.5 V during 8.3 ms surges up to 1250 A.

Use Scenario: Provide stable 130 V reference for analog front-end calibration in high-voltage battery monitoring systems.

IC Role / Device Role / Timing Role: Precision shunt reference element delivering fixed voltage independent of supply ripple.

Use Value: Enables <1% full-scale error in 16-bit ADC measurements due to tight ±5% V_Z tolerance and low 10 Ω Z_ZT.

Automotive Ignition Circuit Snubber

Telecom Line Card Overvoltage Guard

Use Scenario: Suppress inductive kickback from 12 V ignition coils driving 130 V-rated MOSFET gate drivers in HEV powertrain controllers.

IC Role / Device Role / Timing Role: Passive snubbing component placed across coil primary to limit flyback voltage.

Use Value: Extends MOSFET lifetime by capping peak voltage at 136.5 V while surviving repetitive 1250 A pulses per spark event.

Use Scenario: Protect Ethernet PHY interface ICs from induced surges on -48 V telecom power rails during lightning strikes.

IC Role / Device Role / Timing Role: Primary overvoltage protector in redundant -48 V backup supply chain.

Use Value: Maintains system uptime by clamping rail excursions to ≤136.5 V without latch-up, leveraging Class 3 ESD immunity during field servicing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5381B	Same electrical specs but SnPb lead finish; not Pb-free compliant	Acceptable only where RoHS exemption applies (e.g., legacy military repair)	Select 1N5381BG for new designs requiring Pb-free compliance and modern environmental standards.
SMCJ130A	TVS diode with 130 V standoff, 200 W peak power, unidirectional, DO-214AB package	Better suited for fast transient suppression (ns response); less precise DC regulation	Choose SMCJ130A when protecting against ESD/EFT pulses; retain 1N5381BG for stable DC reference or slow overvoltage clamping.

Compared with 1N5381B, the 1N5381BG offers identical regulation performance with Pb-free termination for compliant manufacturing; versus SMCJ130A, it trades faster transient response for tighter DC voltage accuracy and higher steady-state power handling - making it optimal for reference and sustained-clamp roles.

Availability

1N5381BG is available at Aetrix Electronics and suitable for industrial power supply protection, high-voltage reference generation, and automotive ignition snubbing requiring stable component supply across extended temperature ranges and regulatory-compliant packaging.

Supply support for 1N5381BG 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 belongs to onsemi's Surmetic™ 40 Zener regulator family, engineered for high-reliability voltage reference and overvoltage protection in harsh-environment applications demanding wide temperature operation and robust surge immunity.

FAQ

What is the exact zener voltage range for the 1N5381BG at 190 mA test current?

The 1N5381BG has a guaranteed zener voltage range of 123.5 V (minimum) to 136.5 V (maximum) when tested at I_ZT = 190 mA and T_A = 25 °C. This ±5% tolerance reflects JEDEC-standard specification for the "B" suffix and is confirmed in the onsemi datasheet revision 19, page 3. The nominal value is 130 V, and all units meet this range without binning or selection.

Can the 1N5381BG be used in surface-mount designs?

No, the 1N5381BG is exclusively an axial-lead through-hole device in Case 017AA plastic package and is not compatible with SMT assembly. It requires hole mounting and wave or hand soldering. For surface-mount equivalents, consider SOD-123 or DO-214AC packages like 1SMA5945BT3G (130 V), though those differ in power rating and thermal behavior versus the 5 W 1N5381BG.

What is the maximum allowable continuous zener current for the 1N5381BG at 100°C ambient?

At 100 °C ambient, the 1N5381BG must be derated from its 5 W rating using the 40 mW/°C slope above 25 °C. Derating yields P_D = 5 W − (100 − 25) × 0.04 W = 2 W. With V_Z ≈ 130 V, the maximum continuous I_Z is ~15.4 mA. Exceeding this risks thermal runaway; actual design must include heatsinking or pulsed operation to sustain higher currents.

Does the 1N5381BG have a specified temperature coefficient, and how does it affect regulation?

Yes, the 1N5381BG exhibits a positive temperature coefficient of approximately +0.12 mV/°C (per Figure 3 of the datasheet), typical for Zeners above 100 V. This means its zener voltage increases by ~15.6 mV per 130 °C rise - a 0.012% drift - enabling predictable compensation in temperature-stable references when paired with negative-TC components.

How does the surge rating of 1250 A at 8.3 ms translate to real-world protection capability?

The 1250 A surge rating at 8.3 ms defines the peak non-repetitive current the 1N5381BG can safely absorb once without degradation, corresponding to ~130 V × 1250 A × 8.3 ms ≈ 1345 J of energy. This enables reliable clamping of lightning-induced surges on telecom lines or inductive kickback from large solenoids - provided the duty cycle remains low and thermal recovery time is observed between events.

1N5381BG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: T-18, Axial

Packaging:: Bulk

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 130 V

Tolerance:: ±5%

Power - Max:: 5 W

Impedance (Max) (Zzt):: 190 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 98.8 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

1N5381BG FAQ

1.How can I place an order for 1N5381BG through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5381BG 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 1N5381BG reliable?

The price and inventory of 1N5381BG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5381BG is usually 5 days.

3.What payment methods are accepted for 1N5381BG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5381BG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5381BG?

1N5381BG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5381BG 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 1N5381BG?

For technical support, including 1N5381BG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5381BG requirements.

6.How does Aetrix verify that 1N5381BG is sourced from the original manufacturer or authorized distributors?

All 1N5381BG 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 1N5381BG meets industry standards.

7.What is the process for return or replacement of 1N5381BG?

All 1N5381BG units undergo pre-shipment inspection (PSI). If there is an issue with 1N5381BG, 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 1N5381BG part is unused and in its original packaging.

Return procedure for 1N5381BG:

1.Submit a request within 90 days.

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

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