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

onsemi 1N5239B_S00Z

Name: 1N5239B_S00Z
Brand: onsemi
SKU: 1N5239B_S00Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5239B_S00Z

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N5239B_S00Z.pdf

Description:: DIODE ZENER 9.1V 500MW DO35

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Product details

Overview

1N5239B_S00Z from ON Semiconductor is a 9.1 V, ±5% tolerance, 500 mW glass-passivated Zener diode in DO-35 package, designed for precision voltage regulation and reference applications in low-power analog circuits, power supply feedback loops, and overvoltage protection. It features 10 Ω dynamic impedance at 20 mA, 3.0 μA maximum reverse leakage at 7.0 V, and a temperature coefficient of +0.068 %/°C.

For engineers reviewing the 1N5239B_S00Z datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal stability in compact PCB layouts, low leakage under partial bias, and compatibility with through-hole reflow or hand-soldering processes in industrial and consumer power management designs.

Technical Context

This device operates as a two-terminal voltage reference where reverse-biased conduction maintains a stable 9.1 V across its terminals within ±5% tolerance. Its DO-35 glass package ensures hermetic sealing and thermal stability up to +200°C junction temperature, supporting reliable operation in ambient temperatures from –65°C to +175°C.

The 1N5239B_S00Z exhibits a positive temperature coefficient (+0.068 %/°C), indicating increasing Zener voltage with rising temperature - a critical factor when used in temperature-compensated references or stacked Zener configurations. Its 10 Ω Zener impedance at I_Z = 20 mA enables tight regulation under moderate load transients.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	9.1 V nominal at I_Z = 20 mA - defines precise clamping/reference level in feedback or protection circuits
Tolerance	±5% - ensures predictable voltage setting without post-manufacture trimming
Power Dissipation	500 mW at T_A = 25°C - supports continuous regulation in space-constrained linear regulators
Zener Impedance (Z_Z)	10 Ω at I_Z = 20 mA - minimizes output voltage variation under load current changes
Reverse Leakage (I_R)	3.0 μA max at V_R = 7.0 V - reduces quiescent current loss in battery-powered sensing nodes
Temp. Coefficient (TC)	+0.068 %/°C - enables predictable drift compensation in multi-device reference chains
Package	DO-35 glass axial - provides hermeticity, high-reliability solder joint integrity, and JEDEC-standard footprint

Pinout & Package

DO-35 glass axial package with cathode band marking; leads are tinned copper-clad steel, 0.533 mm diameter, 3.05 mm body length, 1.91 mm max diameter. Hermetically sealed, weight 0.137 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-side connection in reverse-bias configuration	Connected to ground or lower-potential node when used as shunt regulator
Cathode	Zener breakdown terminal / high-side connection in reverse-bias configuration	Marked by color band; connects to regulated voltage node or error amplifier input

Key Features

Feature	Design Value
Stable 9.1 V reference	Guaranteed 9.1 V ±5% at 20 mA enables accurate feedback in 12 V supply rails or sensor excitation
Low dynamic impedance	10 Ω Z_Z ensures <10 mV output shift per 100 mA load step - critical for analog front-end stability
Hermetic glass package	DO-35 construction prevents moisture ingress and parameter drift over 10+ year deployments
Controlled tempco	+0.068 %/°C allows predictable thermal tracking in multi-Zener references or temperature-sensing bias networks
Low leakage at sub-Zener voltage	≤3.0 μA at 7.0 V minimizes standby current in always-on monitoring circuits

Applications

Voltage Reference for Op-Amp Circuits	Overvoltage Clamp in Microcontroller I/O Protection
Use Scenario: Providing stable 9.1 V reference to instrumentation amplifier bias networks or ADC reference dividers. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing DC operating point for analog signal conditioning. Use Value: ±5% initial tolerance and +0.068 %/°C TC enable <±1% total drift over –40°C to +85°C without calibration.	Use Scenario: Clamping 12 V rail inputs to microcontroller GPIO pins rated for 5 V absolute maximum. IC Role / Device Role / Timing Role: Shunt protection element diverting transient energy above 9.1 V to ground before IC damage occurs. Use Value: 500 mW power rating sustains 55 ms surge at 100 mA, meeting IEC 61000-4-5 Level 3 requirements.
Feedback Element in Linear Regulators	Temperature-Compensated Bias Network
Use Scenario: Setting output voltage in adjustable LDOs via resistor divider tied to 1N5239B_S00Z cathode. IC Role / Device Role / Timing Role: Precision shunt reference replacing TL431 in cost-sensitive 3.3 V or 5 V fixed-output regulators. Use Value: 10 Ω Z_Z reduces output ripple sensitivity to load current changes by >20 dB vs. higher-impedance alternatives.	Use Scenario: Paired with negative-tempco diode to generate zero-drift bias voltage for precision oscillators. IC Role / Device Role / Timing Role: Positive-tempco voltage source balancing NTC components in oven-controlled oscillator bias paths. Use Value: +0.068 %/°C TC matches common silicon diode NTC curves, enabling <±50 ppm/°C net drift in compensated references.

Voltage Reference for Op-Amp Circuits

Overvoltage Clamp in Microcontroller I/O Protection

Use Scenario: Providing stable 9.1 V reference to instrumentation amplifier bias networks or ADC reference dividers.

IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing DC operating point for analog signal conditioning.

Use Value: ±5% initial tolerance and +0.068 %/°C TC enable <±1% total drift over –40°C to +85°C without calibration.

Use Scenario: Clamping 12 V rail inputs to microcontroller GPIO pins rated for 5 V absolute maximum.

IC Role / Device Role / Timing Role: Shunt protection element diverting transient energy above 9.1 V to ground before IC damage occurs.

Use Value: 500 mW power rating sustains 55 ms surge at 100 mA, meeting IEC 61000-4-5 Level 3 requirements.

Feedback Element in Linear Regulators

Temperature-Compensated Bias Network

Use Scenario: Setting output voltage in adjustable LDOs via resistor divider tied to 1N5239B_S00Z cathode.

IC Role / Device Role / Timing Role: Precision shunt reference replacing TL431 in cost-sensitive 3.3 V or 5 V fixed-output regulators.

Use Value: 10 Ω Z_Z reduces output ripple sensitivity to load current changes by >20 dB vs. higher-impedance alternatives.

Use Scenario: Paired with negative-tempco diode to generate zero-drift bias voltage for precision oscillators.

IC Role / Device Role / Timing Role: Positive-tempco voltage source balancing NTC components in oven-controlled oscillator bias paths.

Use Value: +0.068 %/°C TC matches common silicon diode NTC curves, enabling <±50 ppm/°C net drift in compensated references.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4739A	Same 9.1 V nominal, but ±5% tolerance and 1.0 W power rating in DO-41 package	Higher power handling suits higher-current shunt regulation; larger DO-41 footprint requires PCB redesign	Select when >500 mW dissipation is required and board space permits larger axial package
BZX55C9V1	9.1 V ±5%, 500 mW, DO-35, but tighter 10 Ω Z_Z spec and 1.0 μA I_R at 7 V	Lower leakage improves battery life in always-on sensors; identical DO-35 fit simplifies drop-in validation	Prefer for ultra-low-power IoT endpoints where sub-μA standby leakage is critical

Compared with 1N4739A and BZX55C9V1, the 1N5239B_S00Z offers optimal balance of legacy design compatibility, DO-35 footprint constraint adherence, and proven reliability in industrial control feedback loops - especially where thermal cycling and long-term parameter stability outweigh peak power needs.

Availability

1N5239B_S00Z is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection circuits, and linear regulator feedback networks requiring stable component supply across automotive infotainment power domains, industrial PLC analog I/O modules, and medical patient-monitoring auxiliary supplies.

Supply support for 1N5239B_S00Z 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 energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 1N52xxB series belongs to ON Semiconductor's legacy Zener diode product line, engineered for high-reliability, low-cost voltage regulation in space- and cost-constrained applications where hermetic packaging and tight tolerance matter more than ultra-low leakage or surface-mount form factors.

FAQ

What is the Zener voltage tolerance of the 1N5239B_S00Z?

The 1N5239B_S00Z has a Zener voltage tolerance of ±5% at I_Z = 20 mA, meaning its actual breakdown voltage falls between 8.645 V and 9.555 V under standard test conditions. This tolerance is guaranteed across manufacturing lots and supports consistent performance in untrimmed voltage reference designs without requiring calibration.

Does the 1N5239B_S00Z have a specified forward voltage?

Yes, the 1N5239B_S00Z specifies a maximum forward voltage (V_F) of 1.2 V at I_F = 200 mA. This value is relevant when the device is used in forward conduction mode - for example, as a polarity protection diode - and confirms compatibility with standard silicon diode drive levels in mixed-mode protection circuits.

What is the maximum operating junction temperature for the 1N5239B_S00Z?

The 1N5239B_S00Z has a maximum operating junction temperature (T_J) of +200°C, as specified in its Absolute Maximum Ratings table. This high limit reflects its DO-35 glass package's hermetic construction and makes it suitable for under-hood automotive modules or industrial motor drive control boards where ambient temperatures exceed 125°C.

How does the temperature coefficient of the 1N5239B_S00Z affect circuit performance?

The 1N5239B_S00Z has a temperature coefficient of +0.068 %/°C, meaning its Zener voltage increases by approximately 6.2 mV per °C rise in junction temperature. This predictable positive drift enables intentional pairing with negative-tempco components to build zero-drift references - a technique widely used in precision oscillator biasing and sensor signal conditioning.

Is the 1N5239B_S00Z RoHS compliant and lead-free?

Yes, the 1N5239B_S00Z is RoHS compliant and lead-free, consistent with ON Semiconductor's environmental compliance program. The DO-35 package uses lead-free tinning on copper-clad steel leads, and the device meets JEDEC J-STD-609 Category 1 marking requirements for lead-free identification, supporting environmentally aligned manufacturing and export compliance.

1N5239B_S00Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 9.1 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 10 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 7 V

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

Operating Temperature:: -65°C ~ 200°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

1N5239B_S00Z FAQ

1.How can I place an order for 1N5239B_S00Z through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5239B_S00Z 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 1N5239B_S00Z reliable?

The price and inventory of 1N5239B_S00Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5239B_S00Z is usually 5 days.

3.What payment methods are accepted for 1N5239B_S00Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5239B_S00Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5239B_S00Z?

1N5239B_S00Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5239B_S00Z 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 1N5239B_S00Z?

For technical support, including 1N5239B_S00Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5239B_S00Z requirements.

6.How does Aetrix verify that 1N5239B_S00Z is sourced from the original manufacturer or authorized distributors?

All 1N5239B_S00Z 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 1N5239B_S00Z meets industry standards.

7.What is the process for return or replacement of 1N5239B_S00Z?

All 1N5239B_S00Z units undergo pre-shipment inspection (PSI). If there is an issue with 1N5239B_S00Z, 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 1N5239B_S00Z part is unused and in its original packaging.

Return procedure for 1N5239B_S00Z:

1.Submit a request within 90 days.

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

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