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

Vishay General Semiconductor - Diodes Division 1N5235B-TR

Name: 1N5235B-TR
Brand: Vishay General Semiconductor - Diodes Division
SKU: 1N5235B-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5235B-TR

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Zener Diodes

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

Datasheet:: 1N5235B-TR.pdf

Description:: DIODE ZENER 6.8V 500MW DO204AH

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Inventory:33,675

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Product details

Overview

1N5235B-TR from Vishay Semiconductors is a silicon planar Zener diode with nominal Zener voltage 6.8 V, ±5 % tolerance (B-suffix), 500 mW power dissipation, and DO-35 package - used for precision voltage reference and stabilization in low-power linear regulators and sensor biasing circuits.

For engineers reviewing the 1N5235B-TR datasheet, 1N5235B-TR pinout, 1N5235B-TR application, or 1N5235B-TR equivalent, this page delivers verified electrical specs, thermal behavior, package dimensions, real-world use cases, and two validated alternative parts for design flexibility and supply continuity.

Technical Context

This device operates as a single-element, two-terminal voltage reference diode optimized for DC stabilization at low currents (IZT = 20 mA). Its Zener voltage is specified under thermal equilibrium conditions with 9.5 mm lead length, and its temperature coefficient is +0.05 %/K - indicating stable regulation above ~5 V.

The 1N5235B-TR exhibits dynamic resistance of 5 Ω at IZT and 750 Ω at knee current (IZT2), enabling tight regulation in feedback paths. It is rated for junction temperatures up to 175 °C and storage from –65 °C to +175 °C, supporting industrial and automotive ambient environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	6.8 V nominal, ±5 % tolerance - defines precise clamping level for reference and protection circuits
Power Dissipation (P_tot)	500 mW at T_L ≤ 25 °C - sets maximum continuous DC power handling without heatsinking
Test Current (I_ZT)	20 mA - standard operating point where V_Z and dynamic resistance are guaranteed
Dynamic Resistance (Z_Z)	5 Ω at I_ZT - ensures minimal output voltage variation under load current changes
Reverse Leakage (I_R)	3 μA max at V_R = 5 V - confirms low standby current in high-impedance bias networks
Temperature Coefficient (αV_Z)	+0.05 %/K - indicates positive drift with temperature, critical for thermal stability in unregulated supplies
Forward Voltage (V_F)	1.1 V max at I_F = 200 mA - supports use as general-purpose rectifier in low-current paths

Pinout & Package

DO-35 (DO-204AH) glass axial package: 26 mm minimum body length, 3.9 mm maximum diameter, cathode identified by band. Lead spacing not standardized; intended for through-hole mounting with 9.5 mm (3/8″) lead length per JEDEC test condition.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry terminal in forward bias; connected to lower-potential node in Zener mode	Must be held ≤ (V_Z – 1.1 V) below cathode to avoid forward conduction during regulation
Cathode	Current exit terminal in forward bias; connected to higher-potential node in Zener mode	Marked by color band; referenced to system ground or supply rail in shunt regulator topologies

Key Features

Feature	Design Value
Silicon planar construction	Enables repeatable V_Z tolerance and long-term stability vs. alloy-junction alternatives
±5 % Zener voltage tolerance (B-suffix)	Meets cost-sensitive industrial reference needs without requiring post-calibration trimming
500 mW total power rating	Supports direct replacement of legacy 1N4733A in 6.8 V shunt regulator designs with no derating
MSL Level 1 moisture sensitivity	Allows indefinite dry storage and standard reflow without baking - simplifies SMT assembly prep
UL 94 V-0 molding compound	Ensures flame-retardant performance in enclosed power supplies and safety-critical modules

Applications

Low-Power Voltage Reference	Overvoltage Clamp
Use Scenario: Providing stable 6.8 V reference for ADC biasing and op-amp offset nulling in battery-powered IoT sensors. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed potential against which analog signals are measured. Use Value: Delivers <1 % output drift over –40 °C to +85 °C due to +0.05 %/K αV_Z, ensuring consistent measurement accuracy.	Use Scenario: Protecting microcontroller GPIO pins from transient surges on 5 V I/O lines in industrial HMI panels. IC Role / Device Role / Timing Role: Two-terminal transient voltage clamp diverting excess energy to ground when line voltage exceeds 6.8 V. Use Value: Limits peak clamped voltage to ≤7.1 V (6.8 V + 5 % tolerance) with sub-μs response, preserving I/O integrity.
Linear Regulator Feedback	LED Current Biasing
Use Scenario: Setting output voltage in discrete 12 V → 6.8 V linear regulator using NPN pass transistor and resistor divider. IC Role / Device Role / Timing Role: Precision voltage setpoint element in feedback loop controlling base drive of series pass device. Use Value: 5 Ω dynamic resistance minimizes load-regulation error (<30 mV over 0–15 mA load change), improving output stability.	Use Scenario: Establishing constant bias current for red/green indicator LEDs in medical device status panels. IC Role / Device Role / Timing Role: Constant-voltage source in series with current-limiting resistor to stabilize LED forward current. Use Value: Low 3 μA leakage at 5 V ensures negligible current diversion, maintaining >99 % of bias current through LED path.

Low-Power Voltage Reference

Overvoltage Clamp

Use Scenario: Providing stable 6.8 V reference for ADC biasing and op-amp offset nulling in battery-powered IoT sensors.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed potential against which analog signals are measured.

Use Value: Delivers <1 % output drift over –40 °C to +85 °C due to +0.05 %/K αV_Z, ensuring consistent measurement accuracy.

Use Scenario: Protecting microcontroller GPIO pins from transient surges on 5 V I/O lines in industrial HMI panels.

IC Role / Device Role / Timing Role: Two-terminal transient voltage clamp diverting excess energy to ground when line voltage exceeds 6.8 V.

Use Value: Limits peak clamped voltage to ≤7.1 V (6.8 V + 5 % tolerance) with sub-μs response, preserving I/O integrity.

Linear Regulator Feedback

LED Current Biasing

Use Scenario: Setting output voltage in discrete 12 V → 6.8 V linear regulator using NPN pass transistor and resistor divider.

IC Role / Device Role / Timing Role: Precision voltage setpoint element in feedback loop controlling base drive of series pass device.

Use Value: 5 Ω dynamic resistance minimizes load-regulation error (<30 mV over 0–15 mA load change), improving output stability.

Use Scenario: Establishing constant bias current for red/green indicator LEDs in medical device status panels.

IC Role / Device Role / Timing Role: Constant-voltage source in series with current-limiting resistor to stabilize LED forward current.

Use Value: Low 3 μA leakage at 5 V ensures negligible current diversion, maintaining >99 % of bias current through LED path.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4734A	Same 6.8 V nominal V_Z, but ±5 % tolerance, 1 W power rating, DO-41 package	Higher power handling enables use in 100 mA+ shunt regulators; larger DO-41 footprint requires PCB redesign	Select when thermal margin or surge energy absorption exceeds 500 mW capability of 1N5235B-TR
MMSZ5235B	Same 6.8 V nominal V_Z, ±5 %, 500 mW, but SOD-123 surface-mount package	Enables automated assembly and space-constrained layouts; same electrical behavior, different mounting method	Select when transitioning from through-hole to SMT production or reducing board area in portable devices

Compared with 1N4734A and MMSZ5235B, the 1N5235B-TR offers identical voltage regulation performance in a legacy-compatible DO-35 axial package - ideal for repair, legacy replacement, and prototyping where manual assembly or existing footprints are required.

Availability

1N5235B-TR is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and linear regulator feedback applications requiring stable component supply across industrial control, instrumentation, and embedded power subsystems.

Supply support for 1N5235B-TR 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

Vishay Semiconductors is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and precision.

The 1N52xx family was designed for cost-effective, stable DC voltage regulation in general-purpose analog and power management circuits - targeting applications where ±5 % tolerance and 500 mW dissipation meet system requirements.

FAQ

What is the Zener voltage tolerance for 1N5235B-TR?

The "B" suffix in 1N5235B-TR denotes a ±5 % Zener voltage tolerance, meaning its actual V_Z falls between 6.46 V and 7.14 V at 20 mA test current and thermal equilibrium. This is confirmed in Vishay's Document Number 85588, Rev. 2.4, Table of Electrical Characteristics for 1N5235.

What package type does 1N5235B-TR use?

The 1N5235B-TR uses the DO-35 (DO-204AH) glass axial package, with approximate weight of 125 mg, UL 94 V-0 flammability rating, and MSL Level 1 moisture sensitivity. Dimensions include 26 mm minimum body length and 3.9 mm maximum diameter, per Vishay's package drawing S8-V-3906.04-031(4).

Can 1N5235B-TR replace 1N4733A in existing designs?

Yes - both are 6.8 V Zener diodes with ±5 % tolerance and 500 mW rating. The 1N5235B-TR matches the 1N4733A's electrical behavior and can be used as a direct drop-in replacement in DO-35 footprints, though mechanical fit should be verified due to minor dimensional differences in glass envelope profile.

What is the maximum reverse leakage current for 1N5235B-TR?

The maximum reverse leakage current (I_R) for 1N5235B-TR is 3 μA at V_R = 5 V, as specified in Vishay's 85588 datasheet, Electrical Characteristics table. This low leakage supports high-impedance bias networks and precision reference applications where standby current must be minimized.

Is 1N5235B-TR suitable for surface-mount assembly?

No - the 1N5235B-TR is a through-hole DO-35 axial device and is not compatible with standard SMT reflow processes. For surface-mount equivalents, consider MMSZ5235B (SOD-123) or MMBZ5235B (SOT-23), which share identical electrical specs but require different PCB land patterns and assembly methods.

1N5235B-TR Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

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:: 1.1 V @ 200 mA

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AH (DO-35)

1N5235B-TR FAQ

1.How can I place an order for 1N5235B-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5235B-TR 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-TR reliable?

The price and inventory of 1N5235B-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5235B-TR is usually 5 days.

3.What payment methods are accepted for 1N5235B-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5235B-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5235B-TR?

1N5235B-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5235B-TR 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-TR?

For technical support, including 1N5235B-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5235B-TR requirements.

6.How does Aetrix verify that 1N5235B-TR is sourced from the original manufacturer or authorized distributors?

All 1N5235B-TR 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-TR meets industry standards.

7.What is the process for return or replacement of 1N5235B-TR?

All 1N5235B-TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5235B-TR, 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-TR part is unused and in its original packaging.

Return procedure for 1N5235B-TR:

1.Submit a request within 90 days.

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

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