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

onsemi 1N5258B_T50R

Name: 1N5258B_T50R
Brand: onsemi
SKU: 1N5258B_T50R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5258B_T50R

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N5258B_T50R.pdf

Description:: DIODE ZENER 36V 500MW DO35

Quantity:: RFQ Add To RFQ list

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Inventory:6,880

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Product details

Overview

1N5258B_T50R from ON Semiconductor is a 36 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C with 70 Ω dynamic impedance at 10 mA test current and 0.25 μA maximum reverse leakage at 28.8 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits.

For engineers reviewing the 1N5258B_T50R datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode identification, and direct-fit alternatives for legacy 1N52xxB design replacements.

Technical Context

This device operates in reverse breakdown mode with a nominal Zener voltage of 36 V, measured at I_Z = 10 mA under thermal equilibrium (T_L = 30°C ±1°C, 3/8″ lead length). Its temperature coefficient is +0.093 %/°C, indicating positive drift with rising junction temperature.

The DO-35 hermetically sealed glass package supports operation from −65°C to +200°C junction temperature, with 4.0 mW/°C linear derating above 50°C ambient. Forward voltage is ≤1.2 V at 200 mA, confirming standard silicon PN junction behavior.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	34.2 V min / 36 V typ / 37.8 V max @ I_Z = 10 mA - defines stable regulation band for feedback or reference use
Dynamic Impedance (Z_Z)	70 Ω max @ I_Z = 10 mA - limits output voltage variation under load current changes
Reverse Leakage (I_R)	0.25 μA max @ V_R = 28.8 V - ensures minimal quiescent current in standby clamping
Power Dissipation (P_D)	500 mW @ T_A = 25°C, derates 4.0 mW/°C above 50°C - sets thermal layout constraints on PCB copper area
Temperature Coefficient (TC)	+0.093 %/°C - quantifies V_Z drift magnitude per degree rise in junction temperature
Package	DO-35 glass case with cathode band - enables hand-soldering and visual polarity identification

Pinout & Package

DO-35 glass axial package: hermetically sealed, 0.137 g mass, 4.56 mm body length, 1.91 mm max diameter, cathode identified by single color band. Leads are tinned copper-clad steel, suitable for wave or hand soldering.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener breakdown return path	Connected to lower-potential node in shunt regulator or clamp configuration
Cathode	Zener breakdown output terminal / reference voltage node	Marked with color band; supplies regulated voltage to load or error amplifier input

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables predictable regulation without post-production trimming in cost-sensitive designs
Hermetic DO-35 glass package	Provides long-term stability and moisture resistance for industrial and automotive under-hood environments
−65°C to +200°C operating range	Supports deployment in extreme-temperature applications including engine control and downhole electronics
Low 0.25 μA leakage at 80% V_Z	Minimizes standby power loss in battery-backed or energy-harvesting systems

Applications

Voltage Reference for Op-Amp Circuits	Overvoltage Clamp in Power Supply Rails
Use Scenario: Precision DC bias generation for instrumentation amplifiers and ADC references in sensor signal chains. IC Role / Device Role / Timing Role: Provides stable 36 V reference node to set gain or offset in analog front-end stages. Use Value: Low 70 Ω Z_Z and +0.093 %/°C TC ensure <±0.5% total drift across −40°C to +85°C operating range.	Use Scenario: Protection of 33 V logic rails against transient surges in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Shunts excess energy to ground when rail voltage exceeds 36 V threshold. Use Value: 500 mW rating allows absorption of short-duration 100 ns–1 μs transients without degradation.
Current Source Biasing in LED Drivers	Feedback Divider Stabilization in SMPS
Use Scenario: Setting constant current for low-power indicator LEDs in medical device status panels. IC Role / Device Role / Timing Role: Forms upper leg of two-resistor current mirror with bipolar transistor. Use Value: Tight 5% V_Z tolerance ensures ±5% current accuracy across production lots.	Use Scenario: Stabilizing voltage divider network in optocoupler feedback path of isolated flyback converters. IC Role / Device Role / Timing Role: Maintains fixed reference at TL431 or similar controller's sense input. Use Value: Low 0.25 μA leakage prevents loading error in high-impedance divider arms.

Voltage Reference for Op-Amp Circuits

Overvoltage Clamp in Power Supply Rails

Use Scenario: Precision DC bias generation for instrumentation amplifiers and ADC references in sensor signal chains.

IC Role / Device Role / Timing Role: Provides stable 36 V reference node to set gain or offset in analog front-end stages.

Use Value: Low 70 Ω Z_Z and +0.093 %/°C TC ensure <±0.5% total drift across −40°C to +85°C operating range.

Use Scenario: Protection of 33 V logic rails against transient surges in industrial PLC I/O modules.

IC Role / Device Role / Timing Role: Shunts excess energy to ground when rail voltage exceeds 36 V threshold.

Use Value: 500 mW rating allows absorption of short-duration 100 ns–1 μs transients without degradation.

Current Source Biasing in LED Drivers

Feedback Divider Stabilization in SMPS

Use Scenario: Setting constant current for low-power indicator LEDs in medical device status panels.

IC Role / Device Role / Timing Role: Forms upper leg of two-resistor current mirror with bipolar transistor.

Use Value: Tight 5% V_Z tolerance ensures ±5% current accuracy across production lots.

Use Scenario: Stabilizing voltage divider network in optocoupler feedback path of isolated flyback converters.

IC Role / Device Role / Timing Role: Maintains fixed reference at TL431 or similar controller's sense input.

Use Value: Low 0.25 μA leakage prevents loading error in high-impedance divider arms.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5258BRLG	Same electrical specs; DO-35 package with RoHS-compliant matte tin plating instead of standard tin-lead	No functional difference; selected when lead-free compliance is required for final assembly	Drop-in replacement if RoHS certification is mandated; identical thermal and electrical behavior
BZX55C36	36 V ±5%, 500 mW, but higher Z_Z = 90 Ω @ 5 mA and different test current; TO-92 package	Requires PCB footprint change; higher impedance reduces regulation accuracy under varying load	Use only if DO-35 axial form factor is unavailable; verify layout compatibility and regulation error budget

Compared with 1N5258B_T50R, 1N5258BRLG offers identical performance with RoHS compliance, while BZX55C36 trades axial DO-35 fit for TO-92 mounting and accepts higher Z_Z-induced error in exchange for through-hole flexibility.

Availability

1N5258B_T50R is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and current source biasing applications requiring stable component supply and long-term parametric consistency.

Supply support for 1N5258B_T50R 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 1N52xxB series belongs to ON Semiconductor's legacy Zener diode product line, designed for general-purpose voltage regulation and clamping in cost-sensitive, low-power analog systems.

FAQ

What is the Zener voltage tolerance for 1N5258B_T50R?

The 1N5258B_T50R has a Zener voltage tolerance of ±5%, with a nominal value of 36 V. This means its actual breakdown voltage falls between 34.2 V and 37.8 V when tested at 10 mA under specified thermal conditions. This tolerance is factory-trimmed and guaranteed across the full operating temperature range, making the 1N5258B_T50R suitable for applications where moderate regulation accuracy is acceptable without external calibration.

Does 1N5258B_T50R have a specified forward voltage?

Yes, the 1N5258B_T50R specifies a maximum forward voltage (V_F) of 1.2 V at a forward current (I_F) of 200 mA. This parameter confirms standard silicon PN junction behavior and is relevant when the device is used in forward-conducting roles-such as polarity protection or dual-direction clamping circuits-though its primary function remains reverse-biased Zener regulation.

How does temperature affect the Zener voltage of 1N5258B_T50R?

The 1N5258B_T50R exhibits a positive temperature coefficient of +0.093 %/°C, meaning its Zener voltage increases by approximately 33.5 mV per °C rise in junction temperature. This behavior is typical for Zener diodes above ~5 V and must be accounted for in high-precision reference designs. For example, a 50°C junction temperature rise adds ~1.68 V to the nominal 36 V rating, resulting in ~37.68 V regulation under worst-case thermal conditions.

What is the maximum reverse leakage current for 1N5258B_T50R?

The maximum reverse leakage current (I_R) for 1N5258B_T50R is 0.25 μA when biased at 28.8 V-80% of its nominal Zener voltage. This ultra-low leakage ensures minimal power loss in high-impedance reference networks and makes the 1N5258B_T50R appropriate for battery-powered or energy-constrained systems where standby current must be tightly controlled.

Can 1N5258B_T50R be used in place of other 1N52xxB series diodes?

No-1N5258B_T50R is specifically rated for 36 V Zener voltage and is not interchangeable with other 1N52xxB variants (e.g., 1N5247B at 17 V or 1N5262B at 51 V) due to fundamental differences in breakdown voltage, dynamic impedance, and temperature coefficient. Substitution requires verification of all key parameters-including V_Z, Z_Z, I_R, and TC-against the target circuit's regulation accuracy and thermal stability requirements.

1N5258B_T50R Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 36 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 70 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 27 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

1N5258B_T50R FAQ

1.How can I place an order for 1N5258B_T50R through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5258B_T50R 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 1N5258B_T50R reliable?

The price and inventory of 1N5258B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5258B_T50R is usually 5 days.

3.What payment methods are accepted for 1N5258B_T50R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5258B_T50R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5258B_T50R?

1N5258B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5258B_T50R 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 1N5258B_T50R?

For technical support, including 1N5258B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5258B_T50R requirements.

6.How does Aetrix verify that 1N5258B_T50R is sourced from the original manufacturer or authorized distributors?

All 1N5258B_T50R 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 1N5258B_T50R meets industry standards.

7.What is the process for return or replacement of 1N5258B_T50R?

All 1N5258B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5258B_T50R, 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 1N5258B_T50R part is unused and in its original packaging.

Return procedure for 1N5258B_T50R:

1.Submit a request within 90 days.

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

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