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

onsemi 1N5260B

Name: 1N5260B
Brand: onsemi
SKU: 1N5260B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5260B

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: 1N5260B.pdf

Description:: DIODE ZENER 43V 500MW DO35

Quantity:: RFQ Add To RFQ list

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Inventory:9,957

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Product details

Overview

1N5260B from ON Semiconductor is a 43 V ±5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C, with 93 Ω dynamic impedance at 10 mA test current and 0.1 μA maximum reverse leakage at 33 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.

For engineers reviewing the 1N5260B datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode identification, and direct alternatives for voltage reference design, power supply feedback, and ESD clamp staging.

Technical Context

The 1N5260B operates as a two-terminal, cathode-anode voltage reference device using avalanche breakdown mechanism above ~6 V. Its 43 V nominal Zener voltage is specified at I_Z = 10 mA with tight 5% tolerance and temperature coefficient of +0.095 %/°C, indicating positive drift with rising junction temperature.

It features a hermetically sealed DO-35 glass package with axial leads, color band denoting cathode, and thermal resistance of 250 °C/W (calculated from 500 mW PD and 200 °C max T_J). Derating begins at 50°C ambient at 4.0 mW/°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	40.85–45.15 V @ I_Z = 10 mA - defines stable regulation range under nominal bias
Power Dissipation (P_D)	500 mW @ T_A = 25°C - sets maximum continuous DC power handling before thermal shutdown
Dynamic Impedance (Z_Z)	93 Ω @ I_Z = 10 mA - determines output voltage variation under load current changes
Reverse Leakage (I_R)	0.1 μA @ V_R = 33 V - ensures minimal quiescent current in standby clamping mode
Temperature Coefficient	+0.095 %/°C - quantifies V_Z drift per degree Celsius rise in junction temperature
Forward Voltage (V_F)	≤1.2 V @ I_F = 200 mA - confirms standard silicon diode conduction behavior in forward bias
Package	DO-35 glass - provides hermetic sealing, axial lead form factor, and 0.137 g mass for manual or wave soldering

Pinout & Package

DO-35 glass axial-leaded package with cathode identified by a single color band near one end. Leads are tinned copper-clad steel, 0.46 mm diameter, 25.4 mm minimum length (T50), and 14.0 mm minimum straight section (T26). Package weight is 0.137 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry terminal in forward bias; connected to lower potential during regulation	Accepts forward current up to 200 mA; forms low-impedance path when V_AK ≥ 1.2 V
Cathode	Current exit terminal in forward bias; connected to higher potential during Zener operation	Marked with color band; maintains stable 43 V reference relative to anode when reverse biased above knee voltage

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables use without post-production trimming in cost-sensitive voltage reference designs
Hermetic DO-35 glass construction	Ensures long-term parameter stability and moisture resistance in industrial environments
Low 0.1 μA leakage at 33 V	Minimizes standby power loss in battery-backed or energy-harvesting circuits
Positive temperature coefficient (+0.095 %/°C)	Allows predictable V_Z drift compensation when paired with negative-TC components
500 mW power rating with linear derating	Supports robust transient suppression in 12–48 V rail protection without external heatsinking

Applications

Industrial Power Supply Feedback	Automotive ECU Reference
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold at secondary-side TL431 replacement level. Use Value: Delivers stable 43 V reference with <93 Ω impedance to maintain ±1% output regulation across line/load transients.	Use Scenario: Providing precise bias voltage for sensor signal conditioning circuitry in engine control units. IC Role / Device Role / Timing Role: Voltage reference source for ADC reference buffer and op-amp bias networks. Use Value: Maintains <0.1 μA leakage and +0.095 %/°C TC to ensure consistent 12-bit ADC accuracy over –40°C to +125°C ambient.
Overvoltage Clamp for CAN Transceivers	Legacy Microcontroller Reset Circuit
Use Scenario: Protecting high-speed CAN FD transceiver I/O pins against ISO 7637-2 pulse 1/2a surges. IC Role / Device Role / Timing Role: Secondary-stage shunt clamp limiting bus voltage to 43 V during fast transients. Use Value: Activates within 10 ns at 33 V, clamping peak to ≤45.15 V while dissipating <500 mW in 8.3 ms pulses.	Use Scenario: Generating clean reset signal for 8-bit microcontrollers powered from unregulated 5–24 V rails. IC Role / Device Role / Timing Role: Zener-based threshold detector triggering RC-delayed reset assertion. Use Value: Provides repeatable 43 V trip point with 5% tolerance, enabling deterministic brown-out detection independent of supply ripple.

Industrial Power Supply Feedback

Automotive ECU Reference

Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop.

IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold at secondary-side TL431 replacement level.

Use Value: Delivers stable 43 V reference with <93 Ω impedance to maintain ±1% output regulation across line/load transients.

Use Scenario: Providing precise bias voltage for sensor signal conditioning circuitry in engine control units.

IC Role / Device Role / Timing Role: Voltage reference source for ADC reference buffer and op-amp bias networks.

Use Value: Maintains <0.1 μA leakage and +0.095 %/°C TC to ensure consistent 12-bit ADC accuracy over –40°C to +125°C ambient.

Overvoltage Clamp for CAN Transceivers

Legacy Microcontroller Reset Circuit

Use Scenario: Protecting high-speed CAN FD transceiver I/O pins against ISO 7637-2 pulse 1/2a surges.

IC Role / Device Role / Timing Role: Secondary-stage shunt clamp limiting bus voltage to 43 V during fast transients.

Use Value: Activates within 10 ns at 33 V, clamping peak to ≤45.15 V while dissipating <500 mW in 8.3 ms pulses.

Use Scenario: Generating clean reset signal for 8-bit microcontrollers powered from unregulated 5–24 V rails.

IC Role / Device Role / Timing Role: Zener-based threshold detector triggering RC-delayed reset assertion.

Use Value: Provides repeatable 43 V trip point with 5% tolerance, enabling deterministic brown-out detection independent of supply ripple.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4752A	47 V nominal, 5% tolerance, 1 W power rating, DO-41 package	Higher power handling but larger footprint; requires PCB layout change	Select when >500 mW surge energy must be absorbed without derating
BZX55-C43	43 V nominal, 5% tolerance, 500 mW, DO-35 package, tighter 2% tolerance option available	Same mechanical fit; offers tighter tolerance variants for metrology-grade references	Select when traceable calibration or reduced V_Z spread across production lots is required

Compared with 1N5260B, 1N4752A provides higher power margin but demands DO-41 board space, while BZX55-C43 matches the DO-35 footprint and baseline 43 V rating but supports tighter-tolerance variants for precision applications.

Availability

1N5260B is available at Aetrix Electronics and suitable for industrial power supply feedback, automotive ECU reference, and overvoltage clamp applications requiring stable component supply, long-lifecycle support, and JEDEC-compliant DO-35 sourcing.

Supply support for 1N5260B 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

ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic devices for automotive, industrial, and cloud power systems.

The 1N52xxB series is part of ON Semiconductor's legacy Zener diode portfolio designed for general-purpose voltage regulation, reference, and clamping in cost-optimized, high-reliability discrete applications.

FAQ

What is the nominal Zener voltage of the 1N5260B and how is it tested?

The 1N5260B has a nominal Zener voltage of 43 V, with a guaranteed range of 40.85 V to 45.15 V at 10 mA test current (I_Z). This value is measured under thermal equilibrium conditions at lead temperature of 30°C ± 1°C with 3/8" lead length, per ON Semiconductor specification 1N5221B–1N5263B Rev. 3.

Does the 1N5260B have polarity marking, and how is the cathode identified?

Yes, the 1N5260B uses a single color band on the DO-35 glass body to denote the cathode terminal. This band aligns with industry-standard axial diode marking practice and must be oriented toward the higher-potential node in Zener regulation configurations. The anode is the unmarked end.

What is the maximum allowable reverse leakage current for the 1N5260B, and at what voltage is it specified?

The 1N5260B specifies a maximum reverse leakage current (I_R) of 0.1 μA at V_R = 33 V. This low leakage ensures minimal standby current draw in voltage-sensing and clamp applications where power efficiency is critical.

How does the 1N5260B's power dissipation change above 50°C ambient temperature?

The 1N5260B's power dissipation must be linearly derated above 50°C ambient at 4.0 mW/°C. At 75°C ambient, its usable power drops to 400 mW (500 mW − [25°C × 4.0 mW/°C]), preserving junction temperature below 200°C under continuous operation.

Is the 1N5260B suitable for use in automotive under-hood applications?

The 1N5260B supports an operating junction temperature range of –65°C to +200°C and is qualified per JEDEC DO-204AH, making it suitable for under-hood automotive applications when mounted with adequate thermal relief and within its derated power envelope at elevated ambient temperatures.

1N5260B Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Bulk

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 43 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 93 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 33 V

Voltage - Forward (Vf) (Max) @ If:: 1.2 V @ 200 mA

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

1N5260B FAQ

1.How can I place an order for 1N5260B through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5260B 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 1N5260B reliable?

The price and inventory of 1N5260B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5260B is usually 5 days.

3.What payment methods are accepted for 1N5260B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5260B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5260B?

1N5260B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5260B 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 1N5260B?

For technical support, including 1N5260B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5260B requirements.

6.How does Aetrix verify that 1N5260B is sourced from the original manufacturer or authorized distributors?

All 1N5260B 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 1N5260B meets industry standards.

7.What is the process for return or replacement of 1N5260B?

All 1N5260B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5260B, 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 1N5260B part is unused and in its original packaging.

Return procedure for 1N5260B:

1.Submit a request within 90 days.

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

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