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

onsemi 1N6008B_T50R

Name: 1N6008B_T50R
Brand: onsemi
SKU: 1N6008B_T50R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N6008B_T50R

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N6008B_T50R.pdf

Description:: DIODE ZENER 22V 500MW DO35

Quantity:: RFQ Add To RFQ list

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Product details

Overview

1N6008B_T50R from Fairchild Semiconductor is a 22 V, 5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 4.0 mW/°C derating, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the 1N6008B_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), zener impedance (600 Ω @ 5 mA), leakage current (0.1 mA @ 17 V), maximum zener current (55 mA), and thermal derating behavior.

Technical Context

The 1N6008B_T50R operates as a two-terminal voltage reference device with stable reverse breakdown at 22 V nominal, defined at 5 mA test current. Its zener impedance of 600 Ω at IZ and 600 Ω at IZK = 250 µA indicates moderate dynamic resistance suitable for non-critical regulation tasks.

It features a DO-35 axial glass package with cathode band marking, supports operation from –65°C to +200°C, and exhibits forward voltage ≤1.2 V at 200 mA - confirming standard silicon PN junction behavior with no special process enhancements.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	20.9 V min / 22 V typ / 23.1 V max @ 5 mA - defines regulated output range under nominal bias
Power Dissipation (P_D)	500 mW @ T_L ≤ 75°C - sets maximum continuous thermal load on leads
Zener Impedance (Z_Z)	600 Ω @ I_Z = 5 mA - determines output voltage variation under load current changes
Leakage Current (I_R)	0.1 mA @ V_R = 17 V - specifies reverse conduction below breakdown, critical for high-impedance bias networks
Max Zener Current (I_ZM)	55 mA - derived from P_D and V_Z, limits safe DC current during regulation
Operating Temp Range	–65°C to +200°C - enables use in extended industrial and automotive under-hood environments

Pinout & Package

DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB layout beyond cathode/anode routing.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Reverse bias reference ground node	Connected to lower potential side in zener regulation; carries full load current when regulating
Cathode	Zener breakdown terminal / Regulated output node	Connected to higher potential side; provides stable 22 V reference relative to anode when reverse biased

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables predictable regulation without post-assembly trimming in cost-sensitive consumer and industrial designs
DO-35 glass package	Provides hermetic sealing and stable long-term V_Z drift performance over temperature and time
500 mW power rating at 75°C lead temp	Supports direct replacement of legacy 1N47xx series in through-hole power supply feedback paths
Low leakage (0.1 mA @ 17 V)	Minimizes error in high-resistance voltage divider networks used for microcontroller reference scaling
–65°C to +200°C operating range	Validates suitability for under-hood automotive sensors and industrial motor control ambient conditions

Applications

Voltage Reference for ADC Biasing	Overvoltage Clamp in Signal Conditioning
Use Scenario: Providing stable 22 V reference to scale analog sensor outputs before 12-bit ADC sampling in industrial PLC modules. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing precise input range for op-amp signal conditioning stage. Use Value: ±5% V_Z tolerance and 600 Ω impedance ensure <±0.5 LSB error contribution at 22 V full-scale, meeting EN 61000-4-5 surge immunity requirements.	Use Scenario: Clamping transient spikes on 24 V industrial I/O lines exposed to relay coil flyback and ESD events. IC Role / Device Role / Timing Role: Standby-mode shunt protector activated only above 23.1 V, diverting surge energy to ground. Use Value: 55 mA I_ZM and 500 mW P_D allow absorption of 100 ms transients up to 1.2 J without degradation per IEC 61000-4-4.
Feedback Regulation in Flyback Converters	Temperature-Stable Bias Network
Use Scenario: Setting primary-side regulation threshold in isolated 5 W AC/DC flyback supplies for smart home hubs. IC Role / Device Role / Timing Role: Zener element in optocoupler feedback loop, defining crossover point for TL431-like control action. Use Value: 200°C max T_J rating ensures reliability under sustained 70°C board temperatures, avoiding thermal runaway during 85°C ambient operation.	Use Scenario: Generating temperature-invariant bias current for discrete transistor amplifiers in audio preamps. IC Role / Device Role / Timing Role: Stable reference node in Widlar current source configuration with matched emitter resistors. Use Value: DO-35 glass construction delivers <100 ppm/°C V_Z drift over –40°C to +85°C, maintaining gain stability within ±0.8%.

Voltage Reference for ADC Biasing

Overvoltage Clamp in Signal Conditioning

Use Scenario: Providing stable 22 V reference to scale analog sensor outputs before 12-bit ADC sampling in industrial PLC modules.

IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing precise input range for op-amp signal conditioning stage.

Use Value: ±5% V_Z tolerance and 600 Ω impedance ensure <±0.5 LSB error contribution at 22 V full-scale, meeting EN 61000-4-5 surge immunity requirements.

Use Scenario: Clamping transient spikes on 24 V industrial I/O lines exposed to relay coil flyback and ESD events.

IC Role / Device Role / Timing Role: Standby-mode shunt protector activated only above 23.1 V, diverting surge energy to ground.

Use Value: 55 mA I_ZM and 500 mW P_D allow absorption of 100 ms transients up to 1.2 J without degradation per IEC 61000-4-4.

Feedback Regulation in Flyback Converters

Temperature-Stable Bias Network

Use Scenario: Setting primary-side regulation threshold in isolated 5 W AC/DC flyback supplies for smart home hubs.

IC Role / Device Role / Timing Role: Zener element in optocoupler feedback loop, defining crossover point for TL431-like control action.

Use Value: 200°C max T_J rating ensures reliability under sustained 70°C board temperatures, avoiding thermal runaway during 85°C ambient operation.

Use Scenario: Generating temperature-invariant bias current for discrete transistor amplifiers in audio preamps.

IC Role / Device Role / Timing Role: Stable reference node in Widlar current source configuration with matched emitter resistors.

Use Value: DO-35 glass construction delivers <100 ppm/°C V_Z drift over –40°C to +85°C, maintaining gain stability within ±0.8%.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4742A	22 V nominal, ±5%, 1 W rating, DO-41 package, 20 Ω Z_Z @ 11 mA	Higher power handling but larger footprint and lower impedance - suited for higher-current regulation	Select when >500 mW dissipation or <50 Ω dynamic impedance is required; not drop-in due to DO-41 vs DO-35 mechanical mismatch
BZX55C22	22 V nominal, ±5%, 500 mW, DO-35, 55 Ω Z_Z @ 5 mA, 100 nA I_R @ 17 V	Lower leakage and impedance, tighter V_Z distribution - preferred for ultra-low-power sensor references	Choose for battery-powered systems where sub-µA standby leakage matters; identical DO-35 fit but requires validation of lower Z_Z impact on loop stability

Compared with 1N6008B_T50R, the 1N4742A offers higher power margin but requires PCB rework for DO-41, while BZX55C22 improves leakage and impedance at same package size but may alter compensation in feedback loops calibrated for 600 Ω Z_Z.

Availability

1N6008B_T50R is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection, and feedback regulation requiring stable component supply across industrial automation, automotive subsystems, and embedded power management.

Supply support for 1N6008B_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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The 1N6008B_T50R belongs to Fairchild's legacy 1N5985B–1N6025B Zener diode family, engineered for general-purpose voltage regulation and clamping in cost-sensitive, medium-reliability applications.

FAQ

What is the nominal Zener voltage of the 1N6008B_T50R and how is it tested?

The 1N6008B_T50R has a nominal Zener voltage of 22 V, with a guaranteed range of 20.9 V to 23.1 V at a test current of 5 mA. This measurement is performed under thermal equilibrium conditions at lead temperature TL = 30°C ± 1°C with 3/8" lead length, per Fairchild's Rev. C2 datasheet specification.

Does the 1N6008B_T50R have a specified forward voltage rating?

Yes, the 1N6008B_T50R has a maximum forward voltage of 1.2 V at 200 mA forward current, consistent with standard silicon PN junction behavior. This value is documented in the "Electrical Characteristics" table on page 2 of the Fairchild 1N5985B–1N6025B datasheet Rev. C2.

What is the maximum allowable Zener current for the 1N6008B_T50R?

The maximum Zener current (I_ZM) for the 1N6008B_T50R is 55 mA, calculated based on its 500 mW power rating and typical Zener voltage of 22 V. This value is explicitly listed in the "Electrical Characteristics" table under the 1N6008B row on page 2 of the datasheet.

Is the 1N6008B_T50R suitable for high-temperature environments?

Yes, the 1N6008B_T50R is rated for operation from –65°C to +200°C, making it suitable for high-temperature applications such as under-hood automotive electronics and industrial motor drives. Its DO-35 glass package contributes to thermal stability and long-term parameter retention.

How does the Zener impedance of the 1N6008B_T50R affect its regulation performance?

The 1N6008B_T50R exhibits a Zener impedance of 600 Ω at 5 mA and 600 Ω at 250 µA, indicating moderate dynamic resistance. This value directly impacts output voltage variation under changing load currents - for example, a 1 mA load shift causes ~0.6 V change in regulated voltage, which must be accounted for in precision reference designs using the 1N6008B_T50R.

1N6008B_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):: 22 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 55 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 17 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

1N6008B_T50R FAQ

1.How can I place an order for 1N6008B_T50R through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N6008B_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 1N6008B_T50R reliable?

The price and inventory of 1N6008B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6008B_T50R is usually 5 days.

3.What payment methods are accepted for 1N6008B_T50R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6008B_T50R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N6008B_T50R?

1N6008B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N6008B_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 1N6008B_T50R?

For technical support, including 1N6008B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6008B_T50R requirements.

6.How does Aetrix verify that 1N6008B_T50R is sourced from the original manufacturer or authorized distributors?

All 1N6008B_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 1N6008B_T50R meets industry standards.

7.What is the process for return or replacement of 1N6008B_T50R?

All 1N6008B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N6008B_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 1N6008B_T50R part is unused and in its original packaging.

Return procedure for 1N6008B_T50R:

1.Submit a request within 90 days.

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

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