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

onsemi 1N5235B_T50R

Name: 1N5235B_T50R
Brand: onsemi
SKU: 1N5235B_T50R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5235B_T50R

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N5235B_T50R.pdf

Description:: DIODE ZENER 6.8V 500MW DO35

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Product details

Overview

1N5235B_T50R from ON Semiconductor is a 6.8 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C, with 5 Ω dynamic impedance at 20 mA test current and 3.0 μA maximum reverse leakage at 5.0 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.

For engineers reviewing the 1N5235B_T50R datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode identification, and direct alternatives for voltage regulation design-in.

Technical Context

This device operates in reverse-bias breakdown mode to maintain stable voltage across its terminals under varying load currents. Its 6.8 V nominal Zener voltage is specified at 20 mA test current (IZ), with tight 5% tolerance and temperature coefficient of +0.05%/°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)	6.46–7.14 V @ I_Z = 20 mA - defines regulated output range for reference or clamping
Power Dissipation (P_D)	500 mW @ T_A = 25°C - sets maximum continuous DC power handling before thermal shutdown
Dynamic Impedance (Z_Z)	5.0 Ω @ I_Z = 20 mA - determines output voltage stability under load current variation
Reverse Leakage (I_R)	≤3.0 μA @ V_R = 5.0 V - ensures minimal quiescent current in standby regulation
Temperature Coefficient	+0.05 %/°C - quantifies voltage drift magnitude per degree Celsius rise in junction temperature
Package	DO-35 glass - provides hermetic sealing, axial leads, and cathode band marking for polarity identification

Pinout & Package

DO-35 glass axial-leaded package with cathode identified by a single color band near one lead end. Leads are tinned copper-clad steel; case is hermetically sealed borosilicate glass.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference ground	Connected to circuit ground or lower-potential node when used in shunt regulation
Cathode	Reverse breakdown terminal / Zener voltage output	Connected to regulated node; marked with color band; carries full load current during clamping

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables use in applications requiring tighter regulation than general-purpose Zeners (e.g., sensor biasing)
Low dynamic impedance (5 Ω)	Minimizes output voltage deviation under ±5 mA load current changes in feedback networks
Hermetic DO-35 glass package	Ensures long-term parameter stability in humid or corrosive environments without encapsulation
–65°C to +200°C operating range	Supports deployment in automotive engine compartments and industrial motor control enclosures

Applications

Industrial Sensor Biasing	Microcontroller Reset Circuit
Use Scenario: Providing stable 6.8 V bias to analog front-end op-amps in temperature transmitters. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise common-mode input level. Use Value: Maintains <±10 mV output shift over –40°C to +85°C ambient due to low TC and stable Z_Z.	Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers using resistor-divider + capacitor timing. IC Role / Device Role / Timing Role: Clamping reference node to prevent false resets during supply ramp-up. Use Value: Delivers predictable 6.8 V trigger point with <3 μA leakage, minimizing divider current error.
DC-DC Converter Feedback	ESD Protection Clamp
Use Scenario: Setting output voltage in isolated flyback converters via optocoupler feedback loop. IC Role / Device Role / Timing Role: Precision reference in secondary-side error amplifier circuit. Use Value: Enables ±1% output regulation accuracy with low Z_Z reducing loop gain sensitivity to current variation.	Use Scenario: Protecting RS-232 line receivers against transient surges on data lines. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp limiting voltage to safe levels. Use Value: Responds within nanoseconds to 1 kV ESD events while adding <0.5 pF parasitic capacitance.

Industrial Sensor Biasing

Microcontroller Reset Circuit

Use Scenario: Providing stable 6.8 V bias to analog front-end op-amps in temperature transmitters.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise common-mode input level.

Use Value: Maintains <±10 mV output shift over –40°C to +85°C ambient due to low TC and stable Z_Z.

Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers using resistor-divider + capacitor timing.

IC Role / Device Role / Timing Role: Clamping reference node to prevent false resets during supply ramp-up.

Use Value: Delivers predictable 6.8 V trigger point with <3 μA leakage, minimizing divider current error.

DC-DC Converter Feedback

ESD Protection Clamp

Use Scenario: Setting output voltage in isolated flyback converters via optocoupler feedback loop.

IC Role / Device Role / Timing Role: Precision reference in secondary-side error amplifier circuit.

Use Value: Enables ±1% output regulation accuracy with low Z_Z reducing loop gain sensitivity to current variation.

Use Scenario: Protecting RS-232 line receivers against transient surges on data lines.

IC Role / Device Role / Timing Role: Low-capacitance shunt clamp limiting voltage to safe levels.

Use Value: Responds within nanoseconds to 1 kV ESD events while adding <0.5 pF parasitic capacitance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4734A	6.8 V, 1 W rating, DO-41 package, 5 Ω Z_Z, ±5% tolerance	Higher power handling but larger footprint and higher thermal mass	Select when >500 mW dissipation or board-level mechanical robustness is required
BZX55C6V8	6.8 V, 500 mW, DO-35, ±5%, 8 Ω Z_Z, 100 nA I_R @ 4.5 V	Lower leakage but higher impedance; tighter IR spec at lower VR	Prefer for ultra-low-quiescent systems where leakage dominates power budget

Compared with 1N4734A and BZX55C6V8, the 1N5235B_T50R offers optimal balance of low Z_Z, industry-standard DO-35 form factor, and moderate leakage - making it ideal for space-constrained analog references where 500 mW suffices.

Availability

1N5235B_T50R is available at Aetrix Electronics and suitable for industrial sensor biasing, microcontroller reset circuits, and DC-DC converter feedback networks requiring stable component supply and consistent parametric performance across production lots.

Supply support for 1N5235B_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 portfolio designed for general-purpose voltage regulation and clamping in cost-sensitive, high-reliability applications.

FAQ

What is the Zener voltage tolerance for 1N5235B_T50R?

The 1N5235B_T50R has a guaranteed Zener voltage range of 6.46 V to 7.14 V at 20 mA test current, corresponding to a ±5% tolerance around the nominal 6.8 V rating. This tolerance is verified per ON Semiconductor's 1N5221B–1N5263B datasheet Rev. 3 and applies under standard thermal equilibrium conditions at 25°C ambient.

Does 1N5235B_T50R have a specified forward voltage?

Yes, the 1N5235B_T50R specifies a maximum forward voltage of 1.2 V at 200 mA forward current. This value reflects the typical silicon PN junction drop and is relevant for applications involving bidirectional protection or forward-conduction paths in clamp configurations.

How does temperature affect the Zener voltage of 1N5235B_T50R?

The 1N5235B_T50R exhibits a positive temperature coefficient of +0.05 %/°C, meaning its Zener voltage increases by approximately 3.4 mV per °C rise in junction temperature. This behavior is confirmed in the Electrical Characteristics table and must be accounted for in precision reference designs operating beyond 25°C.

What is the maximum reverse leakage current for 1N5235B_T50R?

The 1N5235B_T50R guarantees a maximum reverse leakage current of 3.0 μA when biased at 5.0 V (V_R). This specification is measured at 25°C and defines the upper bound of off-state current in voltage reference or clamping applications where quiescent power matters.

Is the 1N5235B_T50R packaged in a hermetically sealed case?

Yes, the 1N5235B_T50R uses a DO-35 hermetically sealed glass package, as documented in the Absolute Maximum Ratings section and mechanical drawing DO35AREV03. This construction prevents moisture ingress and ensures long-term parameter stability in harsh environments.

1N5235B_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):: 6.8 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 5 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 5 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

1N5235B_T50R FAQ

1.How can I place an order for 1N5235B_T50R through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5235B_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 1N5235B_T50R reliable?

The price and inventory of 1N5235B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5235B_T50R is usually 5 days.

3.What payment methods are accepted for 1N5235B_T50R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5235B_T50R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5235B_T50R?

1N5235B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5235B_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 1N5235B_T50R?

For technical support, including 1N5235B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5235B_T50R requirements.

6.How does Aetrix verify that 1N5235B_T50R is sourced from the original manufacturer or authorized distributors?

All 1N5235B_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 1N5235B_T50R meets industry standards.

7.What is the process for return or replacement of 1N5235B_T50R?

All 1N5235B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5235B_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 1N5235B_T50R part is unused and in its original packaging.

Return procedure for 1N5235B_T50R:

1.Submit a request within 90 days.

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

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